src/libFLAC/stream_encoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002  Josh Coalson
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA  02111-1307, USA.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h> /* for malloc() */
  22 #include <string.h> /* for memcpy() */
  23 #include "FLAC/assert.h"
  24 #include "FLAC/seek_table.h"
  25 #include "protected/stream_encoder.h"
  26 #include "private/bitbuffer.h"
  27 #include "private/bitmath.h"
  28 #include "private/crc.h"
  29 #include "private/cpu.h"
  30 #include "private/stream_encoder_framing.h"
  31 #include "private/fixed.h"
  32 #include "private/lpc.h"
  33 #include "private/md5.h"
  34 #include "private/memory.h"
  35
  36 #ifdef min
  37 #undef min
  38 #endif
  39 #define min(x,y) ((x)<(y)?(x):(y))
  40
  41 #ifdef max
  42 #undef max
  43 #endif
  44 #define max(x,y) ((x)>(y)?(x):(y))
  45
  46 /***********************************************************************
  47  *
  48  * Private class method prototypes
  49  *
  50  ***********************************************************************/
  51
  52 static FLAC__bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size);
  53 static FLAC__bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame);
  54 static FLAC__bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame);
  55 static FLAC__bool stream_encoder_process_subframe_(FLAC__StreamEncoder *encoder, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__int32 integer_signal[], const FLAC__real real_signal[], FLAC__Subframe *subframe[2], FLAC__int32 *residual[2], unsigned *best_subframe, unsigned *best_bits);
  56 static FLAC__bool stream_encoder_add_subframe_(FLAC__StreamEncoder *encoder, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame);
  57 static unsigned stream_encoder_evaluate_constant_subframe_(const FLAC__int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe);
  58 static unsigned stream_encoder_evaluate_fixed_subframe_(FLAC__StreamEncoder *encoder, const FLAC__int32 signal[], FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe);
  59 static unsigned stream_encoder_evaluate_lpc_subframe_(FLAC__StreamEncoder *encoder, const FLAC__int32 signal[], FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], const FLAC__real lp_coeff[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe);
  60 static unsigned stream_encoder_evaluate_verbatim_subframe_(const FLAC__int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe);
  61 static unsigned stream_encoder_find_best_partition_order_(struct FLAC__StreamEncoderPrivate *private_, const FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, unsigned *best_partition_order, unsigned best_parameters[], unsigned best_raw_bits[]);
  62 static void stream_encoder_precompute_partition_info_sums_(const FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order);
  63 static void stream_encoder_precompute_partition_info_escapes_(const FLAC__int32 residual[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order);
  64 #ifdef DONT_ESTIMATE_RICE_BITS
  65 static FLAC__bool stream_encoder_set_partitioned_rice_(const FLAC__uint32 abs_residual[], const FLAC__int32 residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned *bits);
  66 static FLAC__bool stream_encoder_set_partitioned_rice_with_precompute_(const FLAC__int32 residual[], const FLAC__uint64 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, const FLAC__bool search_for_escapes, unsigned parameters[], unsigned raw_bits[], unsigned *bits);
  67 #else
  68 static FLAC__bool stream_encoder_set_partitioned_rice_(const FLAC__uint32 abs_residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned *bits);
  69 static FLAC__bool stream_encoder_set_partitioned_rice_with_precompute_(const FLAC__uint32 abs_residual[], const FLAC__uint64 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, const FLAC__bool search_for_escapes, unsigned parameters[], unsigned raw_bits[], unsigned *bits);
  70 #endif
  71 static unsigned stream_encoder_get_wasted_bits_(FLAC__int32 signal[], unsigned samples);
  72
  73 /***********************************************************************
  74  *
  75  * Private class data
  76  *
  77  ***********************************************************************/
  78
  79 typedef struct FLAC__StreamEncoderPrivate {
  80         unsigned input_capacity;                          /* current size (in samples) of the signal and residual buffers */
  81         FLAC__int32 *integer_signal[FLAC__MAX_CHANNELS];  /* the integer version of the input signal */
  82         FLAC__int32 *integer_signal_mid_side[2];          /* the integer version of the mid-side input signal (stereo only) */
  83         FLAC__real *real_signal[FLAC__MAX_CHANNELS];      /* the floating-point version of the input signal */
  84         FLAC__real *real_signal_mid_side[2];              /* the floating-point version of the mid-side input signal (stereo only) */
  85         unsigned subframe_bps[FLAC__MAX_CHANNELS];        /* the effective bits per sample of the input signal (stream bps - wasted bits) */
  86         unsigned subframe_bps_mid_side[2];                /* the effective bits per sample of the mid-side input signal (stream bps - wasted bits + 0/1) */
  87         FLAC__int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */
  88         FLAC__int32 *residual_workspace_mid_side[2][2];
  89         FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2];
  90         FLAC__Subframe subframe_workspace_mid_side[2][2];
  91         FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2];
  92         FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2];
  93         unsigned best_subframe[FLAC__MAX_CHANNELS];       /* index into the above workspaces */
  94         unsigned best_subframe_mid_side[2];
  95         unsigned best_subframe_bits[FLAC__MAX_CHANNELS];  /* size in bits of the best subframe for each channel */
  96         unsigned best_subframe_bits_mid_side[2];
  97         FLAC__uint32 *abs_residual;                       /* workspace where abs(candidate residual) is stored */
  98         FLAC__uint64 *abs_residual_partition_sums;        /* workspace where the sum of abs(candidate residual) for each partition is stored */
  99         unsigned *raw_bits_per_partition;                 /* workspace where the sum of silog2(candidate residual) for each partition is stored */
 100         FLAC__BitBuffer *frame;                           /* the current frame being worked on */
 101         double loose_mid_side_stereo_frames_exact;        /* exact number of frames the encoder will use before trying both independent and mid/side frames again */
 102         unsigned loose_mid_side_stereo_frames;            /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */
 103         unsigned loose_mid_side_stereo_frame_count;       /* number of frames using the current channel assignment */
 104         FLAC__ChannelAssignment last_channel_assignment;
 105         FLAC__StreamMetaData metadata;
 106         unsigned current_sample_number;
 107         unsigned current_frame_number;
 108         struct MD5Context md5context;
 109         FLAC__CPUInfo cpuinfo;
 110         unsigned (*local_fixed_compute_best_predictor)(const FLAC__int32 data[], unsigned data_len, FLAC__real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
 111         void (*local_lpc_compute_autocorrelation)(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
 112         void (*local_lpc_compute_residual_from_qlp_coefficients)(const FLAC__int32 data[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
 113         void (*local_lpc_compute_residual_from_qlp_coefficients_16bit)(const FLAC__int32 data[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
 114         FLAC__bool use_wide_by_block;                     /* use slow 64-bit versions of some functions because of the block size */
 115         FLAC__bool use_wide_by_partition;                 /* use slow 64-bit versions of some functions because of the min partition order and blocksize */
 116         FLAC__bool use_wide_by_order;                     /* use slow 64-bit versions of some functions because of the lpc order */
 117         FLAC__bool precompute_partition_sums;             /* our initial guess as to whether precomputing the partitions sums will be a speed improvement */
 118         FLAC__StreamEncoderWriteStatus (*write_callback)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
 119         void (*metadata_callback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data);
 120         void *client_data;
 121         /* unaligned (original) pointers to allocated data */
 122         FLAC__int32 *integer_signal_unaligned[FLAC__MAX_CHANNELS];
 123         FLAC__int32 *integer_signal_mid_side_unaligned[2];
 124         FLAC__real *real_signal_unaligned[FLAC__MAX_CHANNELS];
 125         FLAC__real *real_signal_mid_side_unaligned[2];
 126         FLAC__int32 *residual_workspace_unaligned[FLAC__MAX_CHANNELS][2];
 127         FLAC__int32 *residual_workspace_mid_side_unaligned[2][2];
 128         FLAC__uint32 *abs_residual_unaligned;
 129         FLAC__uint64 *abs_residual_partition_sums_unaligned;
 130         unsigned *raw_bits_per_partition_unaligned;
 131         /*
 132          * These fields have been moved here from private function local
 133          * declarations merely to save stack space during encoding.
 134          */
 135         FLAC__real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER]; /* from stream_encoder_process_subframe_() */
 136         unsigned parameters[2][1 << FLAC__MAX_RICE_PARTITION_ORDER], raw_bits[2][1 << FLAC__MAX_RICE_PARTITION_ORDER]; /* from stream_encoder_find_best_partition_order_() */
 137 } FLAC__StreamEncoderPrivate;
 138
 139 /***********************************************************************
 140  *
 141  * Public static class data
 142  *
 143  ***********************************************************************/
 144
 145 const char *FLAC__StreamEncoderStateString[] = {
 146         "FLAC__STREAM_ENCODER_OK",
 147         "FLAC__STREAM_ENCODER_INVALID_CALLBACK",
 148         "FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS",
 149         "FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE",
 150         "FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE",
 151         "FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE",
 152         "FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION",
 153         "FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH",
 154         "FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH",
 155         "FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE",
 156         "FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER",
 157         "FLAC__STREAM_ENCODER_NOT_STREAMABLE",
 158         "FLAC__STREAM_ENCODER_FRAMING_ERROR",
 159         "FLAC__STREAM_ENCODER_INVALID_SEEK_TABLE",
 160         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING",
 161         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING",
 162         "FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR",
 163         "FLAC__STREAM_ENCODER_ALREADY_INITIALIZED",
 164         "FLAC__STREAM_ENCODER_UNINITIALIZED"
 165 };
 166
 167 const char *FLAC__StreamEncoderWriteStatusString[] = {
 168         "FLAC__STREAM_ENCODER_WRITE_OK",
 169         "FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR"
 170 };
 171
 172 /***********************************************************************
 173  *
 174  * Class constructor/destructor
 175  *
 176  ***********************************************************************/
 177 FLAC__StreamEncoder *FLAC__stream_encoder_new()
 178 {
 179         FLAC__StreamEncoder *encoder;
 180
 181         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 182
 183         encoder = (FLAC__StreamEncoder*)malloc(sizeof(FLAC__StreamEncoder));
 184         if(encoder == 0) {
 185                 return 0;
 186         }
 187         encoder->protected_ = (FLAC__StreamEncoderProtected*)malloc(sizeof(FLAC__StreamEncoderProtected));
 188         if(encoder->protected_ == 0) {
 189                 free(encoder);
 190                 return 0;
 191         }
 192         encoder->private_ = (FLAC__StreamEncoderPrivate*)malloc(sizeof(FLAC__StreamEncoderPrivate));
 193         if(encoder->private_ == 0) {
 194                 free(encoder->protected_);
 195                 free(encoder);
 196                 return 0;
 197         }
 198         encoder->private_->frame = FLAC__bitbuffer_new();
 199         if(encoder->private_->frame == 0) {
 200                 free(encoder->private_);
 201                 free(encoder->protected_);
 202                 free(encoder);
 203                 return 0;
 204         }
 205
 206         encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 207
 208         encoder->protected_->streamable_subset = true;
 209         encoder->protected_->do_mid_side_stereo = false;
 210         encoder->protected_->loose_mid_side_stereo = false;
 211         encoder->protected_->channels = 2;
 212         encoder->protected_->bits_per_sample = 16;
 213         encoder->protected_->sample_rate = 44100;
 214         encoder->protected_->blocksize = 1152;
 215         encoder->protected_->max_lpc_order = 0;
 216         encoder->protected_->qlp_coeff_precision = 0;
 217         encoder->protected_->do_qlp_coeff_prec_search = false;
 218         encoder->protected_->do_exhaustive_model_search = false;
 219         encoder->protected_->do_escape_coding = false;
 220         encoder->protected_->min_residual_partition_order = 0;
 221         encoder->protected_->max_residual_partition_order = 0;
 222         encoder->protected_->rice_parameter_search_dist = 0;
 223         encoder->protected_->total_samples_estimate = 0;
 224         encoder->protected_->seek_table = 0;
 225         encoder->protected_->padding = -1;
 226         encoder->protected_->last_metadata_is_last = true;
 227
 228         encoder->private_->write_callback = 0;
 229         encoder->private_->metadata_callback = 0;
 230         encoder->private_->client_data = 0;
 231
 232         return encoder;
 233 }
 234
 235 void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder)
 236 {
 237         FLAC__ASSERT(encoder != 0);
 238         FLAC__ASSERT(encoder->protected_ != 0);
 239         FLAC__ASSERT(encoder->private_ != 0);
 240         FLAC__ASSERT(encoder->private_->frame != 0);
 241
 242         FLAC__bitbuffer_delete(encoder->private_->frame);
 243         free(encoder->private_);
 244         free(encoder->protected_);
 245         free(encoder);
 246 }
 247
 248 /***********************************************************************
 249  *
 250  * Public class methods
 251  *
 252  ***********************************************************************/
 253
 254 FLAC__StreamEncoderState FLAC__stream_encoder_init(FLAC__StreamEncoder *encoder)
 255 {
 256         unsigned i;
 257         FLAC__StreamMetaData padding_block;
 258         FLAC__StreamMetaData seek_table_block;
 259
 260         FLAC__ASSERT(encoder != 0);
 261
 262         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 263                 return encoder->protected_->state = FLAC__STREAM_ENCODER_ALREADY_INITIALIZED;
 264
 265         encoder->protected_->state = FLAC__STREAM_ENCODER_OK;
 266
 267         if(0 == encoder->private_->write_callback || 0 == encoder->private_->metadata_callback)
 268                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_CALLBACK;
 269
 270         if(encoder->protected_->channels == 0 || encoder->protected_->channels > FLAC__MAX_CHANNELS)
 271                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS;
 272
 273         if(encoder->protected_->do_mid_side_stereo && encoder->protected_->channels != 2)
 274                 return encoder->protected_->state = FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH;
 275
 276         if(encoder->protected_->loose_mid_side_stereo && !encoder->protected_->do_mid_side_stereo)
 277                 return encoder->protected_->state = FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE;
 278
 279         if(encoder->protected_->bits_per_sample >= 32)
 280                 encoder->protected_->do_mid_side_stereo = false; /* since we do 32-bit math, the side channel would have 33 bps and overflow */
 281
 282         if(encoder->protected_->bits_per_sample < FLAC__MIN_BITS_PER_SAMPLE || encoder->protected_->bits_per_sample > FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE)
 283                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE;
 284
 285         if(!FLAC__format_is_valid_sample_rate(encoder->protected_->sample_rate))
 286                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE;
 287
 288         if(encoder->protected_->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->protected_->blocksize > FLAC__MAX_BLOCK_SIZE)
 289                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE;
 290
 291         if(encoder->protected_->blocksize < encoder->protected_->max_lpc_order)
 292                 return encoder->protected_->state = FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER;
 293
 294         if(encoder->protected_->qlp_coeff_precision == 0) {
 295                 if(encoder->protected_->bits_per_sample < 16) {
 296                         /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */
 297                         /* @@@ until then we'll make a guess */
 298                         encoder->protected_->qlp_coeff_precision = max(5, 2 + encoder->protected_->bits_per_sample / 2);
 299                 }
 300                 else if(encoder->protected_->bits_per_sample == 16) {
 301                         if(encoder->protected_->blocksize <= 192)
 302                                 encoder->protected_->qlp_coeff_precision = 7;
 303                         else if(encoder->protected_->blocksize <= 384)
 304                                 encoder->protected_->qlp_coeff_precision = 8;
 305                         else if(encoder->protected_->blocksize <= 576)
 306                                 encoder->protected_->qlp_coeff_precision = 9;
 307                         else if(encoder->protected_->blocksize <= 1152)
 308                                 encoder->protected_->qlp_coeff_precision = 10;
 309                         else if(encoder->protected_->blocksize <= 2304)
 310                                 encoder->protected_->qlp_coeff_precision = 11;
 311                         else if(encoder->protected_->blocksize <= 4608)
 312                                 encoder->protected_->qlp_coeff_precision = 12;
 313                         else
 314                                 encoder->protected_->qlp_coeff_precision = 13;
 315                 }
 316                 else {
 317                         encoder->protected_->qlp_coeff_precision = min(13, 8*sizeof(FLAC__int32) - encoder->protected_->bits_per_sample - 1 - 2); /* @@@ -2 to keep things 32-bit safe */
 318                 }
 319         }
 320         else if(encoder->protected_->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->protected_->qlp_coeff_precision + encoder->protected_->bits_per_sample >= 8*sizeof(FLAC__uint32) || encoder->protected_->qlp_coeff_precision >= (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
 321                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION;
 322
 323         if(encoder->protected_->streamable_subset) {
 324                 /*@@@ add check for blocksize here */
 325                 if(encoder->protected_->bits_per_sample != 8 && encoder->protected_->bits_per_sample != 12 && encoder->protected_->bits_per_sample != 16 && encoder->protected_->bits_per_sample != 20 && encoder->protected_->bits_per_sample != 24)
 326                         return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 327                 if(encoder->protected_->sample_rate > 655350)
 328                         return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 329         }
 330
 331         if(encoder->protected_->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
 332                 encoder->protected_->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
 333         if(encoder->protected_->min_residual_partition_order >= encoder->protected_->max_residual_partition_order)
 334                 encoder->protected_->min_residual_partition_order = encoder->protected_->max_residual_partition_order;
 335
 336         encoder->private_->input_capacity = 0;
 337         for(i = 0; i < encoder->protected_->channels; i++) {
 338                 encoder->private_->integer_signal_unaligned[i] = encoder->private_->integer_signal[i] = 0;
 339                 encoder->private_->real_signal_unaligned[i] = encoder->private_->real_signal[i] = 0;
 340         }
 341         for(i = 0; i < 2; i++) {
 342                 encoder->private_->integer_signal_mid_side_unaligned[i] = encoder->private_->integer_signal_mid_side[i] = 0;
 343                 encoder->private_->real_signal_mid_side_unaligned[i] = encoder->private_->real_signal_mid_side[i] = 0;
 344         }
 345         for(i = 0; i < encoder->protected_->channels; i++) {
 346                 encoder->private_->residual_workspace_unaligned[i][0] = encoder->private_->residual_workspace[i][0] = 0;
 347                 encoder->private_->residual_workspace_unaligned[i][1] = encoder->private_->residual_workspace[i][1] = 0;
 348                 encoder->private_->best_subframe[i] = 0;
 349         }
 350         for(i = 0; i < 2; i++) {
 351                 encoder->private_->residual_workspace_mid_side_unaligned[i][0] = encoder->private_->residual_workspace_mid_side[i][0] = 0;
 352                 encoder->private_->residual_workspace_mid_side_unaligned[i][1] = encoder->private_->residual_workspace_mid_side[i][1] = 0;
 353                 encoder->private_->best_subframe_mid_side[i] = 0;
 354         }
 355         for(i = 0; i < encoder->protected_->channels; i++) {
 356                 encoder->private_->subframe_workspace_ptr[i][0] = &encoder->private_->subframe_workspace[i][0];
 357                 encoder->private_->subframe_workspace_ptr[i][1] = &encoder->private_->subframe_workspace[i][1];
 358         }
 359         for(i = 0; i < 2; i++) {
 360                 encoder->private_->subframe_workspace_ptr_mid_side[i][0] = &encoder->private_->subframe_workspace_mid_side[i][0];
 361                 encoder->private_->subframe_workspace_ptr_mid_side[i][1] = &encoder->private_->subframe_workspace_mid_side[i][1];
 362         }
 363         encoder->private_->abs_residual_unaligned = encoder->private_->abs_residual = 0;
 364         encoder->private_->abs_residual_partition_sums_unaligned = encoder->private_->abs_residual_partition_sums = 0;
 365         encoder->private_->raw_bits_per_partition_unaligned = encoder->private_->raw_bits_per_partition = 0;
 366         encoder->private_->loose_mid_side_stereo_frames_exact = (double)encoder->protected_->sample_rate * 0.4 / (double)encoder->protected_->blocksize;
 367         encoder->private_->loose_mid_side_stereo_frames = (unsigned)(encoder->private_->loose_mid_side_stereo_frames_exact + 0.5);
 368         if(encoder->private_->loose_mid_side_stereo_frames == 0)
 369                 encoder->private_->loose_mid_side_stereo_frames = 1;
 370         encoder->private_->loose_mid_side_stereo_frame_count = 0;
 371         encoder->private_->current_sample_number = 0;
 372         encoder->private_->current_frame_number = 0;
 373
 374         encoder->private_->use_wide_by_block = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected_->blocksize)+1 > 30);
 375         encoder->private_->use_wide_by_order = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(max(encoder->protected_->max_lpc_order, FLAC__MAX_FIXED_ORDER))+1 > 30); /*@@@ need to use this? */
 376         encoder->private_->use_wide_by_partition = (false); /*@@@ need to set this */
 377
 378         /*
 379          * get the CPU info and set the function pointers
 380          */
 381         FLAC__cpu_info(&encoder->private_->cpuinfo);
 382         /* first default to the non-asm routines */
 383         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation;
 384         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor;
 385         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients;
 386         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients;
 387         /* now override with asm where appropriate */
 388 #ifndef FLAC__NO_ASM
 389         if(encoder->private_->cpuinfo.use_asm) {
 390 #ifdef FLAC__CPU_IA32
 391                 FLAC__ASSERT(encoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 392 #ifdef FLAC__HAS_NASM
 393                 if(0 && encoder->private_->cpuinfo.data.ia32.sse) {
 394                         if(encoder->protected_->max_lpc_order < 4)
 395                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_4;
 396                         else if(encoder->protected_->max_lpc_order < 8)
 397                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_8;
 398                         else if(encoder->protected_->max_lpc_order < 12)
 399                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_12;
 400                         else
 401                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 402                 }
 403                 else if(encoder->private_->cpuinfo.data.ia32._3dnow)
 404                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_3dnow;
 405                 else
 406                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 407                 if(encoder->private_->cpuinfo.data.ia32.mmx && encoder->private_->cpuinfo.data.ia32.cmov)
 408                         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov;
 409                 if(encoder->private_->cpuinfo.data.ia32.mmx) {
 410                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 411                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx;
 412                 }
 413                 else {
 414                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 415                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 416                 }
 417 #endif
 418 #endif
 419         }
 420 #endif
 421         /* finally override based on wide-ness if necessary */
 422         if(encoder->private_->use_wide_by_block) {
 423                 encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_wide;
 424         }
 425
 426         /* we require precompute_partition_sums if do_escape_coding because of their intertwined nature */
 427         encoder->private_->precompute_partition_sums = (encoder->protected_->max_residual_partition_order > encoder->protected_->min_residual_partition_order) || encoder->protected_->do_escape_coding;
 428
 429         if(!stream_encoder_resize_buffers_(encoder, encoder->protected_->blocksize)) {
 430                 /* the above function sets the state for us in case of an error */
 431                 return encoder->protected_->state;
 432         }
 433
 434         if(!FLAC__bitbuffer_init(encoder->private_->frame))
 435                 return encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 436
 437         /*
 438          * write the stream header
 439          */
 440         if(!FLAC__bitbuffer_write_raw_uint32(encoder->private_->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN))
 441                 return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 442
 443         encoder->private_->metadata.type = FLAC__METADATA_TYPE_STREAMINFO;
 444         encoder->private_->metadata.is_last = (encoder->protected_->seek_table == 0 && encoder->protected_->padding < 0 && encoder->protected_->last_metadata_is_last);
 445         encoder->private_->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
 446         encoder->private_->metadata.data.stream_info.min_blocksize = encoder->protected_->blocksize; /* this encoder uses the same blocksize for the whole stream */
 447         encoder->private_->metadata.data.stream_info.max_blocksize = encoder->protected_->blocksize;
 448         encoder->private_->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
 449         encoder->private_->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
 450         encoder->private_->metadata.data.stream_info.sample_rate = encoder->protected_->sample_rate;
 451         encoder->private_->metadata.data.stream_info.channels = encoder->protected_->channels;
 452         encoder->private_->metadata.data.stream_info.bits_per_sample = encoder->protected_->bits_per_sample;
 453         encoder->private_->metadata.data.stream_info.total_samples = encoder->protected_->total_samples_estimate; /* we will replace this later with the real total */
 454         memset(encoder->private_->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
 455         MD5Init(&encoder->private_->md5context);
 456         if(!FLAC__add_metadata_block(&encoder->private_->metadata, encoder->private_->frame))
 457                 return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 458
 459         if(0 != encoder->protected_->seek_table) {
 460                 if(!FLAC__seek_table_is_valid(encoder->protected_->seek_table))
 461                         return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_SEEK_TABLE;
 462                 seek_table_block.type = FLAC__METADATA_TYPE_SEEKTABLE;
 463                 seek_table_block.is_last = (encoder->protected_->padding < 0 && encoder->protected_->last_metadata_is_last);
 464                 seek_table_block.length = encoder->protected_->seek_table->num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
 465                 seek_table_block.data.seek_table = *encoder->protected_->seek_table;
 466                 if(!FLAC__add_metadata_block(&seek_table_block, encoder->private_->frame))
 467                         return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 468         }
 469
 470         /* add a PADDING block if requested */
 471         if(encoder->protected_->padding >= 0) {
 472                 padding_block.type = FLAC__METADATA_TYPE_PADDING;
 473                 padding_block.is_last = encoder->protected_->last_metadata_is_last;
 474                 padding_block.length = (unsigned)encoder->protected_->padding;
 475                 if(!FLAC__add_metadata_block(&padding_block, encoder->private_->frame))
 476                         return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 477         }
 478
 479         FLAC__ASSERT(FLAC__bitbuffer_is_byte_aligned(encoder->private_->frame));
 480         {
 481                 FLAC__byte *buffer;
 482                 unsigned bytes;
 483
 484                 FLAC__bitbuffer_get_buffer(encoder->private_->frame, &buffer, &bytes);
 485
 486                 if(encoder->private_->write_callback(encoder, buffer, bytes, 0, encoder->private_->current_frame_number, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_OK)
 487                         return encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
 488
 489                 FLAC__bitbuffer_release_buffer(encoder->private_->frame);
 490         }
 491
 492         /* now that the metadata block is written, we can init this to an absurdly-high value... */
 493         encoder->private_->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
 494         /* ... and clear this to 0 */
 495         encoder->private_->metadata.data.stream_info.total_samples = 0;
 496
 497         return encoder->protected_->state;
 498 }
 499
 500 void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder)
 501 {
 502         unsigned i, channel;
 503
 504         FLAC__ASSERT(encoder != 0);
 505         if(encoder->protected_->state == FLAC__STREAM_ENCODER_UNINITIALIZED)
 506                 return;
 507         if(encoder->private_->current_sample_number != 0) {
 508                 encoder->protected_->blocksize = encoder->private_->current_sample_number;
 509                 stream_encoder_process_frame_(encoder, true); /* true => is last frame */
 510         }
 511         MD5Final(encoder->private_->metadata.data.stream_info.md5sum, &encoder->private_->md5context);
 512         encoder->private_->metadata_callback(encoder, &encoder->private_->metadata, encoder->private_->client_data);
 513         for(i = 0; i < encoder->protected_->channels; i++) {
 514                 if(encoder->private_->integer_signal_unaligned[i] != 0) {
 515                         free(encoder->private_->integer_signal_unaligned[i]);
 516                         encoder->private_->integer_signal_unaligned[i] = 0;
 517                 }
 518                 if(encoder->private_->real_signal_unaligned[i] != 0) {
 519                         free(encoder->private_->real_signal_unaligned[i]);
 520                         encoder->private_->real_signal_unaligned[i] = 0;
 521                 }
 522         }
 523         for(i = 0; i < 2; i++) {
 524                 if(encoder->private_->integer_signal_mid_side_unaligned[i] != 0) {
 525                         free(encoder->private_->integer_signal_mid_side_unaligned[i]);
 526                         encoder->private_->integer_signal_mid_side_unaligned[i] = 0;
 527                 }
 528                 if(encoder->private_->real_signal_mid_side_unaligned[i] != 0) {
 529                         free(encoder->private_->real_signal_mid_side_unaligned[i]);
 530                         encoder->private_->real_signal_mid_side_unaligned[i] = 0;
 531                 }
 532         }
 533         for(channel = 0; channel < encoder->protected_->channels; channel++) {
 534                 for(i = 0; i < 2; i++) {
 535                         if(encoder->private_->residual_workspace_unaligned[channel][i] != 0) {
 536                                 free(encoder->private_->residual_workspace_unaligned[channel][i]);
 537                                 encoder->private_->residual_workspace_unaligned[channel][i] = 0;
 538                         }
 539                 }
 540         }
 541         for(channel = 0; channel < 2; channel++) {
 542                 for(i = 0; i < 2; i++) {
 543                         if(encoder->private_->residual_workspace_mid_side_unaligned[channel][i] != 0) {
 544                                 free(encoder->private_->residual_workspace_mid_side_unaligned[channel][i]);
 545                                 encoder->private_->residual_workspace_mid_side_unaligned[channel][i] = 0;
 546                         }
 547                 }
 548         }
 549         if(encoder->private_->abs_residual_unaligned != 0) {
 550                 free(encoder->private_->abs_residual_unaligned);
 551                 encoder->private_->abs_residual_unaligned = 0;
 552         }
 553         if(encoder->private_->abs_residual_partition_sums_unaligned != 0) {
 554                 free(encoder->private_->abs_residual_partition_sums_unaligned);
 555                 encoder->private_->abs_residual_partition_sums_unaligned = 0;
 556         }
 557         if(encoder->private_->raw_bits_per_partition_unaligned != 0) {
 558                 free(encoder->private_->raw_bits_per_partition_unaligned);
 559                 encoder->private_->raw_bits_per_partition_unaligned = 0;
 560         }
 561         FLAC__bitbuffer_free(encoder->private_->frame);
 562
 563         encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 564 }
 565
 566 FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value)
 567 {
 568         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 569                 return false;
 570         encoder->protected_->streamable_subset = value;
 571         return true;
 572 }
 573
 574 FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
 575 {
 576         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 577                 return false;
 578         encoder->protected_->do_mid_side_stereo = value;
 579         return true;
 580 }
 581
 582 FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
 583 {
 584         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 585                 return false;
 586         encoder->protected_->loose_mid_side_stereo = value;
 587         return true;
 588 }
 589
 590 FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value)
 591 {
 592         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 593                 return false;
 594         encoder->protected_->channels = value;
 595         return true;
 596 }
 597
 598 FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value)
 599 {
 600         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 601                 return false;
 602         encoder->protected_->bits_per_sample = value;
 603         return true;
 604 }
 605
 606 FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value)
 607 {
 608         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 609                 return false;
 610         encoder->protected_->sample_rate = value;
 611         return true;
 612 }
 613
 614 FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value)
 615 {
 616         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 617                 return false;
 618         encoder->protected_->blocksize = value;
 619         return true;
 620 }
 621
 622 FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value)
 623 {
 624         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 625                 return false;
 626         encoder->protected_->max_lpc_order = value;
 627         return true;
 628 }
 629
 630 FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value)
 631 {
 632         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 633                 return false;
 634         encoder->protected_->qlp_coeff_precision = value;
 635         return true;
 636 }
 637
 638 FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
 639 {
 640         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 641                 return false;
 642         encoder->protected_->do_qlp_coeff_prec_search = value;
 643         return true;
 644 }
 645
 646 FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value)
 647 {
 648         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 649                 return false;
 650         encoder->protected_->do_escape_coding = value;
 651         return true;
 652 }
 653
 654 FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
 655 {
 656         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 657                 return false;
 658         encoder->protected_->do_exhaustive_model_search = value;
 659         return true;
 660 }
 661
 662 FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
 663 {
 664         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 665                 return false;
 666         encoder->protected_->min_residual_partition_order = value;
 667         return true;
 668 }
 669
 670 FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
 671 {
 672         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 673                 return false;
 674         encoder->protected_->max_residual_partition_order = value;
 675         return true;
 676 }
 677
 678 FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value)
 679 {
 680         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 681                 return false;
 682         encoder->protected_->rice_parameter_search_dist = value;
 683         return true;
 684 }
 685
 686 FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value)
 687 {
 688         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 689                 return false;
 690         encoder->protected_->total_samples_estimate = value;
 691         return true;
 692 }
 693
 694 FLAC__bool FLAC__stream_encoder_set_seek_table(FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData_SeekTable *value)
 695 {
 696         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 697                 return false;
 698         encoder->protected_->seek_table = value;
 699         return true;
 700 }
 701
 702 FLAC__bool FLAC__stream_encoder_set_padding(FLAC__StreamEncoder *encoder, int value)
 703 {
 704         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 705                 return false;
 706         encoder->protected_->padding = value;
 707         return true;
 708 }
 709
 710 FLAC__bool FLAC__stream_encoder_set_last_metadata_is_last(FLAC__StreamEncoder *encoder, FLAC__bool value)
 711 {
 712         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 713                 return false;
 714         encoder->protected_->last_metadata_is_last = value;
 715         return true;
 716 }
 717
 718 FLAC__bool FLAC__stream_encoder_set_write_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteStatus (*value)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data))
 719 {
 720         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 721                 return false;
 722         encoder->private_->write_callback = value;
 723         return true;
 724 }
 725
 726 FLAC__bool FLAC__stream_encoder_set_metadata_callback(FLAC__StreamEncoder *encoder, void (*value)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data))
 727 {
 728         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 729                 return false;
 730         encoder->private_->metadata_callback = value;
 731         return true;
 732 }
 733
 734 FLAC__bool FLAC__stream_encoder_set_client_data(FLAC__StreamEncoder *encoder, void *value)
 735 {
 736         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 737                 return false;
 738         encoder->private_->client_data = value;
 739         return true;
 740 }
 741
 742 FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder)
 743 {
 744         return encoder->protected_->state;
 745 }
 746
 747 FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder)
 748 {
 749         return encoder->protected_->streamable_subset;
 750 }
 751
 752 FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder)
 753 {
 754         return encoder->protected_->do_mid_side_stereo;
 755 }
 756
 757 FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder)
 758 {
 759         return encoder->protected_->loose_mid_side_stereo;
 760 }
 761
 762 unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder)
 763 {
 764         return encoder->protected_->channels;
 765 }
 766
 767 unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder)
 768 {
 769         return encoder->protected_->bits_per_sample;
 770 }
 771
 772 unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder)
 773 {
 774         return encoder->protected_->sample_rate;
 775 }
 776
 777 unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder)
 778 {
 779         return encoder->protected_->blocksize;
 780 }
 781
 782 unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder)
 783 {
 784         return encoder->protected_->max_lpc_order;
 785 }
 786
 787 unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder)
 788 {
 789         return encoder->protected_->qlp_coeff_precision;
 790 }
 791
 792 FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder)
 793 {
 794         return encoder->protected_->do_qlp_coeff_prec_search;
 795 }
 796
 797 FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder)
 798 {
 799         return encoder->protected_->do_escape_coding;
 800 }
 801
 802 FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder)
 803 {
 804         return encoder->protected_->do_exhaustive_model_search;
 805 }
 806
 807 unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder)
 808 {
 809         return encoder->protected_->min_residual_partition_order;
 810 }
 811
 812 unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder)
 813 {
 814         return encoder->protected_->max_residual_partition_order;
 815 }
 816
 817 unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder)
 818 {
 819         return encoder->protected_->rice_parameter_search_dist;
 820 }
 821
 822 FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 *buf[], unsigned samples)
 823 {
 824         unsigned i, j, channel;
 825         FLAC__int32 x, mid, side;
 826         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
 827
 828         FLAC__ASSERT(encoder != 0);
 829         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
 830
 831         j = 0;
 832         if(encoder->protected_->do_mid_side_stereo && channels == 2) {
 833                 do {
 834                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
 835                                 x = mid = side = buf[0][j];
 836                                 encoder->private_->integer_signal[0][i] = x;
 837                                 encoder->private_->real_signal[0][i] = (FLAC__real)x;
 838                                 x = buf[1][j];
 839                                 encoder->private_->integer_signal[1][i] = x;
 840                                 encoder->private_->real_signal[1][i] = (FLAC__real)x;
 841                                 mid += x;
 842                                 side -= x;
 843                                 mid >>= 1; /* NOTE: not the same as 'mid = (buf[0][j] + buf[1][j]) / 2' ! */
 844                                 encoder->private_->integer_signal_mid_side[1][i] = side;
 845                                 encoder->private_->integer_signal_mid_side[0][i] = mid;
 846                                 encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
 847                                 encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
 848                                 encoder->private_->current_sample_number++;
 849                         }
 850                         if(i == blocksize) {
 851                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 852                                         return false;
 853                         }
 854                 } while(j < samples);
 855         }
 856         else {
 857                 do {
 858                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
 859                                 for(channel = 0; channel < channels; channel++) {
 860                                         x = buf[channel][j];
 861                                         encoder->private_->integer_signal[channel][i] = x;
 862                                         encoder->private_->real_signal[channel][i] = (FLAC__real)x;
 863                                 }
 864                                 encoder->private_->current_sample_number++;
 865                         }
 866                         if(i == blocksize) {
 867                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 868                                         return false;
 869                         }
 870                 } while(j < samples);
 871         }
 872
 873         return true;
 874 }
 875
 876 /* 'samples' is channel-wide samples, e.g. for 1 second at 44100Hz, 'samples' = 44100 regardless of the number of channels */
 877 FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buf[], unsigned samples)
 878 {
 879         unsigned i, j, k, channel;
 880         FLAC__int32 x, mid, side;
 881         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
 882
 883         FLAC__ASSERT(encoder != 0);
 884         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
 885
 886         j = k = 0;
 887         if(encoder->protected_->do_mid_side_stereo && channels == 2) {
 888                 do {
 889                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
 890                                 x = mid = side = buf[k++];
 891                                 encoder->private_->integer_signal[0][i] = x;
 892                                 encoder->private_->real_signal[0][i] = (FLAC__real)x;
 893                                 x = buf[k++];
 894                                 encoder->private_->integer_signal[1][i] = x;
 895                                 encoder->private_->real_signal[1][i] = (FLAC__real)x;
 896                                 mid += x;
 897                                 side -= x;
 898                                 mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
 899                                 encoder->private_->integer_signal_mid_side[1][i] = side;
 900                                 encoder->private_->integer_signal_mid_side[0][i] = mid;
 901                                 encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
 902                                 encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
 903                                 encoder->private_->current_sample_number++;
 904                         }
 905                         if(i == blocksize) {
 906                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 907                                         return false;
 908                         }
 909                 } while(j < samples);
 910         }
 911         else {
 912                 do {
 913                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
 914                                 for(channel = 0; channel < channels; channel++) {
 915                                         x = buf[k++];
 916                                         encoder->private_->integer_signal[channel][i] = x;
 917                                         encoder->private_->real_signal[channel][i] = (FLAC__real)x;
 918                                 }
 919                                 encoder->private_->current_sample_number++;
 920                         }
 921                         if(i == blocksize) {
 922                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 923                                         return false;
 924                         }
 925                 } while(j < samples);
 926         }
 927
 928         return true;
 929 }
 930
 931 FLAC__bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size)
 932 {
 933         FLAC__bool ok;
 934         unsigned i, channel;
 935
 936         FLAC__ASSERT(new_size > 0);
 937         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
 938         FLAC__ASSERT(encoder->private_->current_sample_number == 0);
 939
 940         /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */
 941         if(new_size <= encoder->private_->input_capacity)
 942                 return true;
 943
 944         ok = true;
 945
 946         /* WATCHOUT: FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx() requires that the input arrays (in our case the integer signals) have a buffer of up to 3 zeroes in front (at negative indices) for alignment purposes; we use 4 to keep the data well-aligned. */
 947
 948         for(i = 0; ok && i < encoder->protected_->channels; i++) {
 949                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private_->integer_signal_unaligned[i], &encoder->private_->integer_signal[i]);
 950                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private_->real_signal_unaligned[i], &encoder->private_->real_signal[i]);
 951                 memset(encoder->private_->integer_signal[i], 0, sizeof(FLAC__int32)*4);
 952                 encoder->private_->integer_signal[i] += 4;
 953         }
 954         for(i = 0; ok && i < 2; i++) {
 955                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private_->integer_signal_mid_side_unaligned[i], &encoder->private_->integer_signal_mid_side[i]);
 956                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private_->real_signal_mid_side_unaligned[i], &encoder->private_->real_signal_mid_side[i]);
 957                 memset(encoder->private_->integer_signal_mid_side[i], 0, sizeof(FLAC__int32)*4);
 958                 encoder->private_->integer_signal_mid_side[i] += 4;
 959         }
 960         for(channel = 0; ok && channel < encoder->protected_->channels; channel++) {
 961                 for(i = 0; ok && i < 2; i++) {
 962                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private_->residual_workspace_unaligned[channel][i], &encoder->private_->residual_workspace[channel][i]);
 963                 }
 964         }
 965         for(channel = 0; ok && channel < 2; channel++) {
 966                 for(i = 0; ok && i < 2; i++) {
 967                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private_->residual_workspace_mid_side_unaligned[channel][i], &encoder->private_->residual_workspace_mid_side[channel][i]);
 968                 }
 969         }
 970         ok = ok && FLAC__memory_alloc_aligned_uint32_array(new_size, &encoder->private_->abs_residual_unaligned, &encoder->private_->abs_residual);
 971         if(encoder->private_->precompute_partition_sums || encoder->protected_->do_escape_coding) /* we require precompute_partition_sums if do_escape_coding because of their intertwined nature */
 972                 ok = ok && FLAC__memory_alloc_aligned_uint64_array(new_size * 2, &encoder->private_->abs_residual_partition_sums_unaligned, &encoder->private_->abs_residual_partition_sums);
 973         if(encoder->protected_->do_escape_coding)
 974                 ok = ok && FLAC__memory_alloc_aligned_unsigned_array(new_size * 2, &encoder->private_->raw_bits_per_partition_unaligned, &encoder->private_->raw_bits_per_partition);
 975
 976         if(ok)
 977                 encoder->private_->input_capacity = new_size;
 978         else
 979                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 980
 981         return ok;
 982 }
 983
 984 /***********************************************************************
 985  *
 986  * Private class methods
 987  *
 988  ***********************************************************************/
 989
 990 FLAC__bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame)
 991 {
 992         const FLAC__byte *buffer;
 993         unsigned bytes;
 994
 995         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
 996
 997         /*
 998          * Accumulate raw signal to the MD5 signature
 999          */
1000         /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 2 here: */
1001         if(!FLAC__MD5Accumulate(&encoder->private_->md5context, encoder->private_->integer_signal, encoder->protected_->channels, encoder->protected_->blocksize, (encoder->protected_->bits_per_sample+7) / 8)) {
1002                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1003                 return false;
1004         }
1005
1006         /*
1007          * Process the frame header and subframes into the frame bitbuffer
1008          */
1009         if(!stream_encoder_process_subframes_(encoder, is_last_frame)) {
1010                 /* the above function sets the state for us in case of an error */
1011                 return false;
1012         }
1013
1014         /*
1015          * Zero-pad the frame to a byte_boundary
1016          */
1017         if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(encoder->private_->frame)) {
1018                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1019                 return false;
1020         }
1021
1022         /*
1023          * CRC-16 the whole thing
1024          */
1025         FLAC__ASSERT(FLAC__bitbuffer_is_byte_aligned(encoder->private_->frame));
1026         FLAC__bitbuffer_write_raw_uint32(encoder->private_->frame, FLAC__bitbuffer_get_write_crc16(encoder->private_->frame), FLAC__FRAME_FOOTER_CRC_LEN);
1027
1028         /*
1029          * Write it
1030          */
1031         FLAC__bitbuffer_get_buffer(encoder->private_->frame, &buffer, &bytes);
1032         if(encoder->private_->write_callback(encoder, buffer, bytes, encoder->protected_->blocksize, encoder->private_->current_frame_number, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_OK) {
1033                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
1034                 return false;
1035         }
1036         FLAC__bitbuffer_release_buffer(encoder->private_->frame);
1037
1038         /*
1039          * Get ready for the next frame
1040          */
1041         encoder->private_->current_sample_number = 0;
1042         encoder->private_->current_frame_number++;
1043         encoder->private_->metadata.data.stream_info.total_samples += (FLAC__uint64)encoder->protected_->blocksize;
1044         encoder->private_->metadata.data.stream_info.min_framesize = min(bytes, encoder->private_->metadata.data.stream_info.min_framesize);
1045         encoder->private_->metadata.data.stream_info.max_framesize = max(bytes, encoder->private_->metadata.data.stream_info.max_framesize);
1046
1047         return true;
1048 }
1049
1050 FLAC__bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame)
1051 {
1052         FLAC__FrameHeader frame_header;
1053         unsigned channel, min_partition_order = encoder->protected_->min_residual_partition_order, max_partition_order;
1054         FLAC__bool do_independent, do_mid_side, precompute_partition_sums;
1055
1056         /*
1057          * Calculate the min,max Rice partition orders
1058          */
1059         if(is_last_frame) {
1060                 max_partition_order = 0;
1061         }
1062         else {
1063                 unsigned limit = 0, b = encoder->protected_->blocksize;
1064                 while(!(b & 1)) {
1065                         limit++;
1066                         b >>= 1;
1067                 }
1068                 max_partition_order = min(encoder->protected_->max_residual_partition_order, limit);
1069         }
1070         min_partition_order = min(min_partition_order, max_partition_order);
1071
1072         precompute_partition_sums = encoder->private_->precompute_partition_sums && ((max_partition_order > min_partition_order) || encoder->protected_->do_escape_coding);
1073
1074         /*
1075          * Setup the frame
1076          */
1077         if(!FLAC__bitbuffer_clear(encoder->private_->frame)) {
1078                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1079                 return false;
1080         }
1081         frame_header.blocksize = encoder->protected_->blocksize;
1082         frame_header.sample_rate = encoder->protected_->sample_rate;
1083         frame_header.channels = encoder->protected_->channels;
1084         frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
1085         frame_header.bits_per_sample = encoder->protected_->bits_per_sample;
1086         frame_header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
1087         frame_header.number.frame_number = encoder->private_->current_frame_number;
1088
1089         /*
1090          * Figure out what channel assignments to try
1091          */
1092         if(encoder->protected_->do_mid_side_stereo) {
1093                 if(encoder->protected_->loose_mid_side_stereo) {
1094                         if(encoder->private_->loose_mid_side_stereo_frame_count == 0) {
1095                                 do_independent = true;
1096                                 do_mid_side = true;
1097                         }
1098                         else {
1099                                 do_independent = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
1100                                 do_mid_side = !do_independent;
1101                         }
1102                 }
1103                 else {
1104                         do_independent = true;
1105                         do_mid_side = true;
1106                 }
1107         }
1108         else {
1109                 do_independent = true;
1110                 do_mid_side = false;
1111         }
1112
1113         FLAC__ASSERT(do_independent || do_mid_side);
1114
1115         /*
1116          * Check for wasted bits; set effective bps for each subframe
1117          */
1118         if(do_independent) {
1119                 unsigned w;
1120                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1121                         w = stream_encoder_get_wasted_bits_(encoder->private_->integer_signal[channel], encoder->protected_->blocksize);
1122                         encoder->private_->subframe_workspace[channel][0].wasted_bits = encoder->private_->subframe_workspace[channel][1].wasted_bits = w;
1123                         encoder->private_->subframe_bps[channel] = encoder->protected_->bits_per_sample - w;
1124                 }
1125         }
1126         if(do_mid_side) {
1127                 unsigned w;
1128                 FLAC__ASSERT(encoder->protected_->channels == 2);
1129                 for(channel = 0; channel < 2; channel++) {
1130                         w = stream_encoder_get_wasted_bits_(encoder->private_->integer_signal_mid_side[channel], encoder->protected_->blocksize);
1131                         encoder->private_->subframe_workspace_mid_side[channel][0].wasted_bits = encoder->private_->subframe_workspace_mid_side[channel][1].wasted_bits = w;
1132                         encoder->private_->subframe_bps_mid_side[channel] = encoder->protected_->bits_per_sample - w + (channel==0? 0:1);
1133                 }
1134         }
1135
1136         /*
1137          * First do a normal encoding pass of each independent channel
1138          */
1139         if(do_independent) {
1140                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1141                         if(!stream_encoder_process_subframe_(encoder, min_partition_order, max_partition_order, precompute_partition_sums, false, &frame_header, encoder->private_->subframe_bps[channel], encoder->private_->integer_signal[channel], encoder->private_->real_signal[channel], encoder->private_->subframe_workspace_ptr[channel], encoder->private_->residual_workspace[channel], encoder->private_->best_subframe+channel, encoder->private_->best_subframe_bits+channel))
1142                                 return false;
1143                 }
1144         }
1145
1146         /*
1147          * Now do mid and side channels if requested
1148          */
1149         if(do_mid_side) {
1150                 FLAC__ASSERT(encoder->protected_->channels == 2);
1151
1152                 for(channel = 0; channel < 2; channel++) {
1153                         if(!stream_encoder_process_subframe_(encoder, min_partition_order, max_partition_order, precompute_partition_sums, false, &frame_header, encoder->private_->subframe_bps_mid_side[channel], encoder->private_->integer_signal_mid_side[channel], encoder->private_->real_signal_mid_side[channel], encoder->private_->subframe_workspace_ptr_mid_side[channel], encoder->private_->residual_workspace_mid_side[channel], encoder->private_->best_subframe_mid_side+channel, encoder->private_->best_subframe_bits_mid_side+channel))
1154                                 return false;
1155                 }
1156         }
1157
1158         /*
1159          * Compose the frame bitbuffer
1160          */
1161         if(do_mid_side) {
1162                 unsigned left_bps = 0, right_bps = 0; /* initialized only to prevent superfluous compiler warning */
1163                 FLAC__Subframe *left_subframe = 0, *right_subframe = 0; /* initialized only to prevent superfluous compiler warning */
1164                 FLAC__ChannelAssignment channel_assignment;
1165
1166                 FLAC__ASSERT(encoder->protected_->channels == 2);
1167
1168                 if(encoder->protected_->loose_mid_side_stereo && encoder->private_->loose_mid_side_stereo_frame_count > 0) {
1169                         channel_assignment = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE);
1170                 }
1171                 else {
1172                         unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
1173                         unsigned min_bits;
1174                         FLAC__ChannelAssignment ca;
1175
1176                         FLAC__ASSERT(do_independent && do_mid_side);
1177
1178                         /* We have to figure out which channel assignent results in the smallest frame */
1179                         bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits         [1];
1180                         bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE  ] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits_mid_side[1];
1181                         bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->private_->best_subframe_bits         [1] + encoder->private_->best_subframe_bits_mid_side[1];
1182                         bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE   ] = encoder->private_->best_subframe_bits_mid_side[0] + encoder->private_->best_subframe_bits_mid_side[1];
1183
1184                         for(channel_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) {
1185                                 if(bits[ca] < min_bits) {
1186                                         min_bits = bits[ca];
1187                                         channel_assignment = ca;
1188                                 }
1189                         }
1190                 }
1191
1192                 frame_header.channel_assignment = channel_assignment;
1193
1194                 if(!FLAC__frame_add_header(&frame_header, encoder->protected_->streamable_subset, is_last_frame, encoder->private_->frame)) {
1195                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1196                         return false;
1197                 }
1198
1199                 switch(channel_assignment) {
1200                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1201                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
1202                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
1203                                 break;
1204                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1205                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
1206                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1207                                 break;
1208                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1209                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1210                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
1211                                 break;
1212                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1213                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[0][encoder->private_->best_subframe_mid_side[0]];
1214                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1215                                 break;
1216                         default:
1217                                 FLAC__ASSERT(0);
1218                 }
1219
1220                 switch(channel_assignment) {
1221                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1222                                 left_bps  = encoder->private_->subframe_bps         [0];
1223                                 right_bps = encoder->private_->subframe_bps         [1];
1224                                 break;
1225                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1226                                 left_bps  = encoder->private_->subframe_bps         [0];
1227                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
1228                                 break;
1229                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1230                                 left_bps  = encoder->private_->subframe_bps_mid_side[1];
1231                                 right_bps = encoder->private_->subframe_bps         [1];
1232                                 break;
1233                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1234                                 left_bps  = encoder->private_->subframe_bps_mid_side[0];
1235                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
1236                                 break;
1237                         default:
1238                                 FLAC__ASSERT(0);
1239                 }
1240
1241                 /* note that encoder_add_subframe_ sets the state for us in case of an error */
1242                 if(!stream_encoder_add_subframe_(encoder, &frame_header, left_bps , left_subframe , encoder->private_->frame))
1243                         return false;
1244                 if(!stream_encoder_add_subframe_(encoder, &frame_header, right_bps, right_subframe, encoder->private_->frame))
1245                         return false;
1246         }
1247         else {
1248                 if(!FLAC__frame_add_header(&frame_header, encoder->protected_->streamable_subset, is_last_frame, encoder->private_->frame)) {
1249                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1250                         return false;
1251                 }
1252
1253                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1254                         if(!stream_encoder_add_subframe_(encoder, &frame_header, encoder->private_->subframe_bps[channel], &encoder->private_->subframe_workspace[channel][encoder->private_->best_subframe[channel]], encoder->private_->frame)) {
1255                                 /* the above function sets the state for us in case of an error */
1256                                 return false;
1257                         }
1258                 }
1259         }
1260
1261         if(encoder->protected_->loose_mid_side_stereo) {
1262                 encoder->private_->loose_mid_side_stereo_frame_count++;
1263                 if(encoder->private_->loose_mid_side_stereo_frame_count >= encoder->private_->loose_mid_side_stereo_frames)
1264                         encoder->private_->loose_mid_side_stereo_frame_count = 0;
1265         }
1266
1267         encoder->private_->last_channel_assignment = frame_header.channel_assignment;
1268
1269         return true;
1270 }
1271
1272 FLAC__bool stream_encoder_process_subframe_(FLAC__StreamEncoder *encoder, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__int32 integer_signal[], const FLAC__real real_signal[], FLAC__Subframe *subframe[2], FLAC__int32 *residual[2], unsigned *best_subframe, unsigned *best_bits)
1273 {
1274         FLAC__real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
1275         FLAC__real lpc_residual_bits_per_sample;
1276         FLAC__real autoc[FLAC__MAX_LPC_ORDER+1]; /* WATCHOUT: the size is important even though encoder->protected_->max_lpc_order might be less; some asm routines need all the space */
1277         FLAC__real lpc_error[FLAC__MAX_LPC_ORDER];
1278         unsigned min_lpc_order, max_lpc_order, lpc_order;
1279         unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
1280         unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
1281         unsigned rice_parameter;
1282         unsigned _candidate_bits, _best_bits;
1283         unsigned _best_subframe;
1284
1285         /* verbatim subframe is the baseline against which we measure other compressed subframes */
1286         _best_subframe = 0;
1287         _best_bits = stream_encoder_evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
1288
1289         if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
1290                 /* check for constant subframe */
1291                 guess_fixed_order = encoder->private_->local_fixed_compute_best_predictor(integer_signal+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample);
1292                 if(fixed_residual_bits_per_sample[1] == 0.0) {
1293                         /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
1294                         unsigned i, signal_is_constant = true;
1295                         for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
1296                                 if(integer_signal[0] != integer_signal[i]) {
1297                                         signal_is_constant = false;
1298                                         break;
1299                                 }
1300                         }
1301                         if(signal_is_constant) {
1302                                 _candidate_bits = stream_encoder_evaluate_constant_subframe_(integer_signal[0], subframe_bps, subframe[!_best_subframe]);
1303                                 if(_candidate_bits < _best_bits) {
1304                                         _best_subframe = !_best_subframe;
1305                                         _best_bits = _candidate_bits;
1306                                 }
1307                         }
1308                 }
1309                 else {
1310                         /* encode fixed */
1311                         if(encoder->protected_->do_exhaustive_model_search) {
1312                                 min_fixed_order = 0;
1313                                 max_fixed_order = FLAC__MAX_FIXED_ORDER;
1314                         }
1315                         else {
1316                                 min_fixed_order = max_fixed_order = guess_fixed_order;
1317                         }
1318                         for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
1319                                 if(fixed_residual_bits_per_sample[fixed_order] >= (FLAC__real)subframe_bps)
1320                                         continue; /* don't even try */
1321                                 rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+0.5) : 0; /* 0.5 is for rounding */
1322 #ifndef FLAC__SYMMETRIC_RICE
1323                                 rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1324 #endif
1325                                 if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1326 #ifdef DEBUG_VERBOSE
1327                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @0\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1328 #endif
1329                                         rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1330                                 }
1331                                 _candidate_bits = stream_encoder_evaluate_fixed_subframe_(encoder, integer_signal, residual[!_best_subframe], encoder->private_->abs_residual, encoder->private_->abs_residual_partition_sums, encoder->private_->raw_bits_per_partition, frame_header->blocksize, subframe_bps, fixed_order, rice_parameter, min_partition_order, max_partition_order, precompute_partition_sums, encoder->protected_->do_escape_coding, encoder->protected_->rice_parameter_search_dist, subframe[!_best_subframe]);
1332                                 if(_candidate_bits < _best_bits) {
1333                                         _best_subframe = !_best_subframe;
1334                                         _best_bits = _candidate_bits;
1335                                 }
1336                         }
1337
1338                         /* encode lpc */
1339                         if(encoder->protected_->max_lpc_order > 0) {
1340                                 if(encoder->protected_->max_lpc_order >= frame_header->blocksize)
1341                                         max_lpc_order = frame_header->blocksize-1;
1342                                 else
1343                                         max_lpc_order = encoder->protected_->max_lpc_order;
1344                                 if(max_lpc_order > 0) {
1345                                         encoder->private_->local_lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc);
1346                                         /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */
1347                                         if(autoc[0] != 0.0) {
1348                                                 FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, encoder->private_->lp_coeff, lpc_error);
1349                                                 if(encoder->protected_->do_exhaustive_model_search) {
1350                                                         min_lpc_order = 1;
1351                                                 }
1352                                                 else {
1353                                                         unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, subframe_bps);
1354                                                         min_lpc_order = max_lpc_order = guess_lpc_order;
1355                                                 }
1356                                                 if(encoder->protected_->do_qlp_coeff_prec_search) {
1357                                                         min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
1358                                                         max_qlp_coeff_precision = min(8*sizeof(FLAC__int32) - subframe_bps - 1 - 2, (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)-1); /* -2 to keep things 32-bit safe */
1359                                                 }
1360                                                 else {
1361                                                         min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->protected_->qlp_coeff_precision;
1362                                                 }
1363                                                 for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
1364                                                         lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order);
1365                                                         if(lpc_residual_bits_per_sample >= (FLAC__real)subframe_bps)
1366                                                                 continue; /* don't even try */
1367                                                         rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */
1368 #ifndef FLAC__SYMMETRIC_RICE
1369                                                         rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1370 #endif
1371                                                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1372 #ifdef DEBUG_VERBOSE
1373                                                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @1\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1374 #endif
1375                                                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1376                                                         }
1377                                                         for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
1378                                                                 _candidate_bits = stream_encoder_evaluate_lpc_subframe_(encoder, integer_signal, residual[!_best_subframe], encoder->private_->abs_residual, encoder->private_->abs_residual_partition_sums, encoder->private_->raw_bits_per_partition, encoder->private_->lp_coeff[lpc_order-1], frame_header->blocksize, subframe_bps, lpc_order, qlp_coeff_precision, rice_parameter, min_partition_order, max_partition_order, precompute_partition_sums, encoder->protected_->do_escape_coding, encoder->protected_->rice_parameter_search_dist, subframe[!_best_subframe]);
1379                                                                 if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
1380                                                                         if(_candidate_bits < _best_bits) {
1381                                                                                 _best_subframe = !_best_subframe;
1382                                                                                 _best_bits = _candidate_bits;
1383                                                                         }
1384                                                                 }
1385                                                         }
1386                                                 }
1387                                         }
1388                                 }
1389                         }
1390                 }
1391         }
1392
1393         *best_subframe = _best_subframe;
1394         *best_bits = _best_bits;
1395
1396         return true;
1397 }
1398
1399 FLAC__bool stream_encoder_add_subframe_(FLAC__StreamEncoder *encoder, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame)
1400 {
1401         switch(subframe->type) {
1402                 case FLAC__SUBFRAME_TYPE_CONSTANT:
1403                         if(!FLAC__subframe_add_constant(&(subframe->data.constant), subframe_bps, subframe->wasted_bits, frame)) {
1404                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1405                                 return false;
1406                         }
1407                         break;
1408                 case FLAC__SUBFRAME_TYPE_FIXED:
1409                         if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, subframe_bps, subframe->wasted_bits, frame)) {
1410                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1411                                 return false;
1412                         }
1413                         break;
1414                 case FLAC__SUBFRAME_TYPE_LPC:
1415                         if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, subframe_bps, subframe->wasted_bits, frame)) {
1416                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1417                                 return false;
1418                         }
1419                         break;
1420                 case FLAC__SUBFRAME_TYPE_VERBATIM:
1421                         if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, subframe_bps, subframe->wasted_bits, frame)) {
1422                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1423                                 return false;
1424                         }
1425                         break;
1426                 default:
1427                         FLAC__ASSERT(0);
1428         }
1429
1430         return true;
1431 }
1432
1433 unsigned stream_encoder_evaluate_constant_subframe_(const FLAC__int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe)
1434 {
1435         subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT;
1436         subframe->data.constant.value = signal;
1437
1438         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe_bps;
1439 }
1440
1441 unsigned stream_encoder_evaluate_fixed_subframe_(FLAC__StreamEncoder *encoder, const FLAC__int32 signal[], FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe)
1442 {
1443         unsigned i, residual_bits;
1444         const unsigned residual_samples = blocksize - order;
1445
1446         FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual);
1447
1448         subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
1449
1450         subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
1451         subframe->data.fixed.residual = residual;
1452
1453         residual_bits = stream_encoder_find_best_partition_order_(encoder->private_, residual, abs_residual, abs_residual_partition_sums, raw_bits_per_partition, residual_samples, order, rice_parameter, min_partition_order, max_partition_order, precompute_partition_sums, do_escape_coding, rice_parameter_search_dist, &subframe->data.fixed.entropy_coding_method.data.partitioned_rice.order, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.parameters, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.raw_bits);
1454
1455         subframe->data.fixed.order = order;
1456         for(i = 0; i < order; i++)
1457                 subframe->data.fixed.warmup[i] = signal[i];
1458
1459         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (order * subframe_bps) + residual_bits;
1460 }
1461
1462 unsigned stream_encoder_evaluate_lpc_subframe_(FLAC__StreamEncoder *encoder, const FLAC__int32 signal[], FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], const FLAC__real lp_coeff[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe)
1463 {
1464         FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
1465         unsigned i, residual_bits;
1466         int quantization, ret;
1467         const unsigned residual_samples = blocksize - order;
1468
1469         ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, subframe_bps, qlp_coeff, &quantization);
1470         if(ret != 0)
1471                 return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */
1472
1473         if(subframe_bps <= 16 && qlp_coeff_precision <= 16)
1474                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
1475         else
1476                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
1477
1478         subframe->type = FLAC__SUBFRAME_TYPE_LPC;
1479
1480         subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
1481         subframe->data.lpc.residual = residual;
1482
1483         residual_bits = stream_encoder_find_best_partition_order_(encoder->private_, residual, abs_residual, abs_residual_partition_sums, raw_bits_per_partition, residual_samples, order, rice_parameter, min_partition_order, max_partition_order, precompute_partition_sums, do_escape_coding, rice_parameter_search_dist, &subframe->data.lpc.entropy_coding_method.data.partitioned_rice.order, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.parameters, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.raw_bits);
1484
1485         subframe->data.lpc.order = order;
1486         subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision;
1487         subframe->data.lpc.quantization_level = quantization;
1488         memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(FLAC__int32)*FLAC__MAX_LPC_ORDER);
1489         for(i = 0; i < order; i++)
1490                 subframe->data.lpc.warmup[i] = signal[i];
1491
1492         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN + FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN + (order * (qlp_coeff_precision + subframe_bps)) + residual_bits;
1493 }
1494
1495 unsigned stream_encoder_evaluate_verbatim_subframe_(const FLAC__int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe)
1496 {
1497         subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
1498
1499         subframe->data.verbatim.data = signal;
1500
1501         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (blocksize * subframe_bps);
1502 }
1503
1504 unsigned stream_encoder_find_best_partition_order_(FLAC__StreamEncoderPrivate *private_, const FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, unsigned *best_partition_order, unsigned best_parameters[], unsigned best_raw_bits[])
1505 {
1506         FLAC__int32 r;
1507         unsigned residual_bits, best_residual_bits = 0;
1508         unsigned residual_sample;
1509         unsigned best_parameters_index = 0;
1510         const unsigned blocksize = residual_samples + predictor_order;
1511
1512         /* compute abs(residual) for use later */
1513         for(residual_sample = 0; residual_sample < residual_samples; residual_sample++) {
1514                 r = residual[residual_sample];
1515                 abs_residual[residual_sample] = (FLAC__uint32)(r<0? -r : r);
1516         }
1517
1518         while(max_partition_order > 0 && blocksize >> max_partition_order <= predictor_order)
1519                 max_partition_order--;
1520         FLAC__ASSERT(blocksize >> max_partition_order > predictor_order);
1521         min_partition_order = min(min_partition_order, max_partition_order);
1522
1523         if(precompute_partition_sums) {
1524                 int partition_order;
1525                 unsigned sum;
1526
1527                 stream_encoder_precompute_partition_info_sums_(abs_residual, abs_residual_partition_sums, residual_samples, predictor_order, min_partition_order, max_partition_order);
1528
1529                 if(do_escape_coding)
1530                         stream_encoder_precompute_partition_info_escapes_(residual, raw_bits_per_partition, residual_samples, predictor_order, min_partition_order, max_partition_order);
1531
1532                 for(partition_order = (int)max_partition_order, sum = 0; partition_order >= (int)min_partition_order; partition_order--) {
1533 #ifdef DONT_ESTIMATE_RICE_BITS
1534                         if(!stream_encoder_set_partitioned_rice_with_precompute_(residual, abs_residual_partition_sums+sum, raw_bits_per_partition+sum, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, (unsigned)partition_order, do_escape_coding, private_->parameters[!best_parameters_index], private_->raw_bits[!best_parameters_index], &residual_bits))
1535 #else
1536                         if(!stream_encoder_set_partitioned_rice_with_precompute_(abs_residual, abs_residual_partition_sums+sum, raw_bits_per_partition+sum, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, (unsigned)partition_order, do_escape_coding, private_->parameters[!best_parameters_index], private_->raw_bits[!best_parameters_index], &residual_bits))
1537 #endif
1538                         {
1539                                 FLAC__ASSERT(best_residual_bits != 0);
1540                                 break;
1541                         }
1542                         sum += 1u << partition_order;
1543                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1544                                 best_residual_bits = residual_bits;
1545                                 *best_partition_order = partition_order;
1546                                 best_parameters_index = !best_parameters_index;
1547                         }
1548                 }
1549         }
1550         else {
1551                 unsigned partition_order;
1552                 for(partition_order = min_partition_order; partition_order <= max_partition_order; partition_order++) {
1553 #ifdef DONT_ESTIMATE_RICE_BITS
1554                         if(!stream_encoder_set_partitioned_rice_(abs_residual, residual, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, partition_order, private_->parameters[!best_parameters_index], &residual_bits))
1555 #else
1556                         if(!stream_encoder_set_partitioned_rice_(abs_residual, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, partition_order, private_->parameters[!best_parameters_index], &residual_bits))
1557 #endif
1558                         {
1559                                 FLAC__ASSERT(best_residual_bits != 0);
1560                                 break;
1561                         }
1562                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1563                                 best_residual_bits = residual_bits;
1564                                 *best_partition_order = partition_order;
1565                                 best_parameters_index = !best_parameters_index;
1566                         }
1567                 }
1568         }
1569
1570         memcpy(best_parameters, private_->parameters[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1571         memcpy(best_raw_bits, private_->raw_bits[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1572
1573         return best_residual_bits;
1574 }
1575
1576 void stream_encoder_precompute_partition_info_sums_(const FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order)
1577 {
1578         int partition_order;
1579         unsigned from_partition, to_partition = 0;
1580         const unsigned blocksize = residual_samples + predictor_order;
1581
1582         /* first do max_partition_order */
1583         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
1584                 FLAC__uint64 abs_residual_partition_sum;
1585                 FLAC__uint32 abs_r;
1586                 unsigned partition, partition_sample, partition_samples, residual_sample;
1587                 const unsigned partitions = 1u << partition_order;
1588                 const unsigned default_partition_samples = blocksize >> partition_order;
1589
1590                 FLAC__ASSERT(default_partition_samples > predictor_order);
1591
1592                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1593                         partition_samples = default_partition_samples;
1594                         if(partition == 0)
1595                                 partition_samples -= predictor_order;
1596                         abs_residual_partition_sum = 0;
1597                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
1598                                 abs_r = abs_residual[residual_sample];
1599                                 abs_residual_partition_sum += abs_r;
1600                                 residual_sample++;
1601                         }
1602                         abs_residual_partition_sums[partition] = abs_residual_partition_sum;
1603                 }
1604                 to_partition = partitions;
1605                 break;
1606         }
1607
1608         /* now merge partitions for lower orders */
1609         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
1610                 FLAC__uint64 s;
1611                 unsigned i;
1612                 const unsigned partitions = 1u << partition_order;
1613                 for(i = 0; i < partitions; i++) {
1614                         s = abs_residual_partition_sums[from_partition];
1615                         from_partition++;
1616                         abs_residual_partition_sums[to_partition] = s + abs_residual_partition_sums[from_partition];
1617                         from_partition++;
1618                         to_partition++;
1619                 }
1620         }
1621 }
1622
1623 void stream_encoder_precompute_partition_info_escapes_(const FLAC__int32 residual[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order)
1624 {
1625         int partition_order;
1626         unsigned from_partition, to_partition = 0;
1627         const unsigned blocksize = residual_samples + predictor_order;
1628
1629         /* first do max_partition_order */
1630         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
1631                 FLAC__int32 r, residual_partition_min, residual_partition_max;
1632                 unsigned silog2_min, silog2_max;
1633                 unsigned partition, partition_sample, partition_samples, residual_sample;
1634                 const unsigned partitions = 1u << partition_order;
1635                 const unsigned default_partition_samples = blocksize >> partition_order;
1636
1637                 FLAC__ASSERT(default_partition_samples > predictor_order);
1638
1639                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1640                         partition_samples = default_partition_samples;
1641                         if(partition == 0)
1642                                 partition_samples -= predictor_order;
1643                         residual_partition_min = residual_partition_max = 0;
1644                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
1645                                 r = residual[residual_sample];
1646                                 if(r < residual_partition_min)
1647                                         residual_partition_min = r;
1648                                 else if(r > residual_partition_max)
1649                                         residual_partition_max = r;
1650                                 residual_sample++;
1651                         }
1652                         silog2_min = FLAC__bitmath_silog2(residual_partition_min);
1653                         silog2_max = FLAC__bitmath_silog2(residual_partition_max);
1654                         raw_bits_per_partition[partition] = max(silog2_min, silog2_max);
1655                 }
1656                 to_partition = partitions;
1657                 break;
1658         }
1659
1660         /* now merge partitions for lower orders */
1661         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
1662                 unsigned m;
1663                 unsigned i;
1664                 const unsigned partitions = 1u << partition_order;
1665                 for(i = 0; i < partitions; i++) {
1666                         m = raw_bits_per_partition[from_partition];
1667                         from_partition++;
1668                         raw_bits_per_partition[to_partition] = max(m, raw_bits_per_partition[from_partition]);
1669                         from_partition++;
1670                         to_partition++;
1671                 }
1672         }
1673 }
1674
1675 #ifdef VARIABLE_RICE_BITS
1676 #undef VARIABLE_RICE_BITS
1677 #endif
1678 #ifndef DONT_ESTIMATE_RICE_BITS
1679 #define VARIABLE_RICE_BITS(value, parameter) ((value) >> (parameter))
1680 #endif
1681
1682 #ifdef DONT_ESTIMATE_RICE_BITS
1683 FLAC__bool stream_encoder_set_partitioned_rice_(const FLAC__uint32 abs_residual[], const FLAC__int32 residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned *bits)
1684 #else
1685 FLAC__bool stream_encoder_set_partitioned_rice_(const FLAC__uint32 abs_residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned *bits)
1686 #endif
1687 {
1688         unsigned rice_parameter, partition_bits;
1689 #ifndef NO_RICE_SEARCH
1690         unsigned best_partition_bits;
1691         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
1692 #endif
1693         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
1694
1695         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
1696
1697         if(partition_order == 0) {
1698                 unsigned i;
1699
1700 #ifndef NO_RICE_SEARCH
1701                 if(rice_parameter_search_dist) {
1702                         if(suggested_rice_parameter < rice_parameter_search_dist)
1703                                 min_rice_parameter = 0;
1704                         else
1705                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
1706                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
1707                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1708 #ifdef DEBUG_VERBOSE
1709                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @2\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1710 #endif
1711                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1712                         }
1713                 }
1714                 else
1715                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
1716
1717                 best_partition_bits = 0xffffffff;
1718                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1719 #endif
1720 #ifdef VARIABLE_RICE_BITS
1721 #ifdef FLAC__SYMMETRIC_RICE
1722                         partition_bits = (2+rice_parameter) * residual_samples;
1723 #else
1724                         const unsigned rice_parameter_estimate = rice_parameter-1;
1725                         partition_bits = (1+rice_parameter) * residual_samples;
1726 #endif
1727 #else
1728                         partition_bits = 0;
1729 #endif
1730                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1731                         for(i = 0; i < residual_samples; i++) {
1732 #ifdef VARIABLE_RICE_BITS
1733 #ifdef FLAC__SYMMETRIC_RICE
1734                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
1735 #else
1736                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
1737 #endif
1738 #else
1739                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] in addition to abs_residual[] */
1740 #endif
1741                         }
1742 #ifndef NO_RICE_SEARCH
1743                         if(partition_bits < best_partition_bits) {
1744                                 best_rice_parameter = rice_parameter;
1745                                 best_partition_bits = partition_bits;
1746                         }
1747                 }
1748 #endif
1749                 parameters[0] = best_rice_parameter;
1750                 bits_ += best_partition_bits;
1751         }
1752         else {
1753                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
1754                 unsigned partition_samples;
1755                 FLAC__uint64 mean, k;
1756                 const unsigned partitions = 1u << partition_order;
1757                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1758                         partition_samples = (residual_samples+predictor_order) >> partition_order;
1759                         if(partition == 0) {
1760                                 if(partition_samples <= predictor_order)
1761                                         return false;
1762                                 else
1763                                         partition_samples -= predictor_order;
1764                         }
1765                         mean = 0;
1766                         save_residual_sample = residual_sample;
1767                         for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++)
1768                                 mean += abs_residual[residual_sample];
1769                         residual_sample = save_residual_sample;
1770 #ifdef FLAC__SYMMETRIC_RICE
1771                         mean += partition_samples >> 1; /* for rounding effect */
1772                         mean /= partition_samples;
1773
1774                         /* calc rice_parameter = floor(log2(mean)) */
1775                         rice_parameter = 0;
1776                         mean>>=1;
1777                         while(mean) {
1778                                 rice_parameter++;
1779                                 mean >>= 1;
1780                         }
1781 #else
1782                         /* calc rice_parameter ala LOCO-I */
1783                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
1784                                 ;
1785 #endif
1786                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1787 #ifdef DEBUG_VERBOSE
1788                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @3\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1789 #endif
1790                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1791                         }
1792
1793 #ifndef NO_RICE_SEARCH
1794                         if(rice_parameter_search_dist) {
1795                                 if(rice_parameter < rice_parameter_search_dist)
1796                                         min_rice_parameter = 0;
1797                                 else
1798                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
1799                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
1800                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1801 #ifdef DEBUG_VERBOSE
1802                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @4\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1803 #endif
1804                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1805                                 }
1806                         }
1807                         else
1808                                 min_rice_parameter = max_rice_parameter = rice_parameter;
1809
1810                         best_partition_bits = 0xffffffff;
1811                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1812 #endif
1813 #ifdef VARIABLE_RICE_BITS
1814 #ifdef FLAC__SYMMETRIC_RICE
1815                                 partition_bits = (2+rice_parameter) * partition_samples;
1816 #else
1817                                 const unsigned rice_parameter_estimate = rice_parameter-1;
1818                                 partition_bits = (1+rice_parameter) * partition_samples;
1819 #endif
1820 #else
1821                                 partition_bits = 0;
1822 #endif
1823                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1824                                 save_residual_sample = residual_sample;
1825                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
1826 #ifdef VARIABLE_RICE_BITS
1827 #ifdef FLAC__SYMMETRIC_RICE
1828                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
1829 #else
1830                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
1831 #endif
1832 #else
1833                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] in addition to abs_residual[] */
1834 #endif
1835                                 }
1836 #ifndef NO_RICE_SEARCH
1837                                 if(rice_parameter != max_rice_parameter)
1838                                         residual_sample = save_residual_sample;
1839                                 if(partition_bits < best_partition_bits) {
1840                                         best_rice_parameter = rice_parameter;
1841                                         best_partition_bits = partition_bits;
1842                                 }
1843                         }
1844 #endif
1845                         parameters[partition] = best_rice_parameter;
1846                         bits_ += best_partition_bits;
1847                 }
1848         }
1849
1850         *bits = bits_;
1851         return true;
1852 }
1853
1854 #ifdef DONT_ESTIMATE_RICE_BITS
1855 FLAC__bool stream_encoder_set_partitioned_rice_with_precompute_(const FLAC__int32 residual[], const FLAC__uint64 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, const FLAC__bool search_for_escapes, unsigned parameters[], unsigned raw_bits[], unsigned *bits)
1856 #else
1857 FLAC__bool stream_encoder_set_partitioned_rice_with_precompute_(const FLAC__uint32 abs_residual[], const FLAC__uint64 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, const FLAC__bool search_for_escapes, unsigned parameters[], unsigned raw_bits[], unsigned *bits)
1858 #endif
1859 {
1860         unsigned rice_parameter, partition_bits;
1861 #ifndef NO_RICE_SEARCH
1862         unsigned best_partition_bits;
1863         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
1864 #endif
1865         unsigned flat_bits;
1866         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
1867
1868         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
1869
1870         if(partition_order == 0) {
1871                 unsigned i;
1872
1873 #ifndef NO_RICE_SEARCH
1874                 if(rice_parameter_search_dist) {
1875                         if(suggested_rice_parameter < rice_parameter_search_dist)
1876                                 min_rice_parameter = 0;
1877                         else
1878                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
1879                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
1880                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1881 #ifdef DEBUG_VERBOSE
1882                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @5\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1883 #endif
1884                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1885                         }
1886                 }
1887                 else
1888                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
1889
1890                 best_partition_bits = 0xffffffff;
1891                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1892 #endif
1893 #ifdef VARIABLE_RICE_BITS
1894 #ifdef FLAC__SYMMETRIC_RICE
1895                         partition_bits = (2+rice_parameter) * residual_samples;
1896 #else
1897                         const unsigned rice_parameter_estimate = rice_parameter-1;
1898                         partition_bits = (1+rice_parameter) * residual_samples;
1899 #endif
1900 #else
1901                         partition_bits = 0;
1902 #endif
1903                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1904                         for(i = 0; i < residual_samples; i++) {
1905 #ifdef VARIABLE_RICE_BITS
1906 #ifdef FLAC__SYMMETRIC_RICE
1907                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
1908 #else
1909                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
1910 #endif
1911 #else
1912                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
1913 #endif
1914                         }
1915 #ifndef NO_RICE_SEARCH
1916                         if(partition_bits < best_partition_bits) {
1917                                 best_rice_parameter = rice_parameter;
1918                                 best_partition_bits = partition_bits;
1919                         }
1920                 }
1921 #endif
1922                 if(search_for_escapes) {
1923                         flat_bits = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN + raw_bits_per_partition[0] * residual_samples;
1924                         if(flat_bits <= best_partition_bits) {
1925                                 raw_bits[0] = raw_bits_per_partition[0];
1926                                 best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
1927                                 best_partition_bits = flat_bits;
1928                         }
1929                 }
1930                 parameters[0] = best_rice_parameter;
1931                 bits_ += best_partition_bits;
1932         }
1933         else {
1934                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
1935                 unsigned partition_samples;
1936                 FLAC__uint64 mean, k;
1937                 const unsigned partitions = 1u << partition_order;
1938                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1939                         partition_samples = (residual_samples+predictor_order) >> partition_order;
1940                         if(partition == 0) {
1941                                 if(partition_samples <= predictor_order)
1942                                         return false;
1943                                 else
1944                                         partition_samples -= predictor_order;
1945                         }
1946                         mean = abs_residual_partition_sums[partition];
1947 #ifdef FLAC__SYMMETRIC_RICE
1948                         mean += partition_samples >> 1; /* for rounding effect */
1949                         mean /= partition_samples;
1950
1951                         /* calc rice_parameter = floor(log2(mean)) */
1952                         rice_parameter = 0;
1953                         mean>>=1;
1954                         while(mean) {
1955                                 rice_parameter++;
1956                                 mean >>= 1;
1957                         }
1958 #else
1959                         /* calc rice_parameter ala LOCO-I */
1960                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
1961                                 ;
1962 #endif
1963                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1964 #ifdef DEBUG_VERBOSE
1965                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @6\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1966 #endif
1967                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1968                         }
1969
1970 #ifndef NO_RICE_SEARCH
1971                         if(rice_parameter_search_dist) {
1972                                 if(rice_parameter < rice_parameter_search_dist)
1973                                         min_rice_parameter = 0;
1974                                 else
1975                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
1976                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
1977                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1978 #ifdef DEBUG_VERBOSE
1979                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @7\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1980 #endif
1981                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1982                                 }
1983                         }
1984                         else
1985                                 min_rice_parameter = max_rice_parameter = rice_parameter;
1986
1987                         best_partition_bits = 0xffffffff;
1988                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1989 #endif
1990 #ifdef VARIABLE_RICE_BITS
1991 #ifdef FLAC__SYMMETRIC_RICE
1992                                 partition_bits = (2+rice_parameter) * partition_samples;
1993 #else
1994                                 const unsigned rice_parameter_estimate = rice_parameter-1;
1995                                 partition_bits = (1+rice_parameter) * partition_samples;
1996 #endif
1997 #else
1998                                 partition_bits = 0;
1999 #endif
2000                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2001                                 save_residual_sample = residual_sample;
2002                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
2003 #ifdef VARIABLE_RICE_BITS
2004 #ifdef FLAC__SYMMETRIC_RICE
2005                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
2006 #else
2007                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
2008 #endif
2009 #else
2010                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
2011 #endif
2012                                 }
2013 #ifndef NO_RICE_SEARCH
2014                                 if(rice_parameter != max_rice_parameter)
2015                                         residual_sample = save_residual_sample;
2016                                 if(partition_bits < best_partition_bits) {
2017                                         best_rice_parameter = rice_parameter;
2018                                         best_partition_bits = partition_bits;
2019                                 }
2020                         }
2021 #endif
2022                         if(search_for_escapes) {
2023                                 flat_bits = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN + raw_bits_per_partition[partition] * partition_samples;
2024                                 if(flat_bits <= best_partition_bits) {
2025                                         raw_bits[partition] = raw_bits_per_partition[partition];
2026                                         best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2027                                         best_partition_bits = flat_bits;
2028                                 }
2029                         }
2030                         parameters[partition] = best_rice_parameter;
2031                         bits_ += best_partition_bits;
2032                 }
2033         }
2034
2035         *bits = bits_;
2036         return true;
2037 }
2038
2039 unsigned stream_encoder_get_wasted_bits_(FLAC__int32 signal[], unsigned samples)
2040 {
2041         unsigned i, shift;
2042         FLAC__int32 x = 0;
2043
2044         for(i = 0; i < samples && !(x&1); i++)
2045                 x |= signal[i];
2046
2047         if(x == 0) {
2048                 shift = 0;
2049         }
2050         else {
2051                 for(shift = 0; !(x&1); shift++)
2052                         x >>= 1;
2053         }
2054
2055         if(shift > 0) {
2056                 for(i = 0; i < samples; i++)
2057                          signal[i] >>= shift;
2058         }
2059
2060         return shift;
2061 }