src/libFLAC/stream_encoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001  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_(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_(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 } FLAC__StreamEncoderPrivate;
 132
 133 /***********************************************************************
 134  *
 135  * Public static class data
 136  *
 137  ***********************************************************************/
 138
 139 const char *FLAC__StreamEncoderStateString[] = {
 140         "FLAC__STREAM_ENCODER_OK",
 141         "FLAC__STREAM_ENCODER_INVALID_CALLBACK",
 142         "FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS",
 143         "FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE",
 144         "FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE",
 145         "FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE",
 146         "FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION",
 147         "FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH",
 148         "FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH",
 149         "FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE",
 150         "FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER",
 151         "FLAC__STREAM_ENCODER_NOT_STREAMABLE",
 152         "FLAC__STREAM_ENCODER_FRAMING_ERROR",
 153         "FLAC__STREAM_ENCODER_INVALID_SEEK_TABLE",
 154         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING",
 155         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING",
 156         "FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR",
 157         "FLAC__STREAM_ENCODER_ALREADY_INITIALIZED",
 158         "FLAC__STREAM_ENCODER_UNINITIALIZED"
 159 };
 160
 161 const char *FLAC__StreamEncoderWriteStatusString[] = {
 162         "FLAC__STREAM_ENCODER_WRITE_OK",
 163         "FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR"
 164 };
 165
 166 /***********************************************************************
 167  *
 168  * Class constructor/destructor
 169  *
 170  ***********************************************************************/
 171 FLAC__StreamEncoder *FLAC__stream_encoder_new()
 172 {
 173         FLAC__StreamEncoder *encoder;
 174
 175         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 176
 177         encoder = (FLAC__StreamEncoder*)malloc(sizeof(FLAC__StreamEncoder));
 178         if(encoder == 0) {
 179                 return 0;
 180         }
 181         encoder->protected = (FLAC__StreamEncoderProtected*)malloc(sizeof(FLAC__StreamEncoderProtected));
 182         if(encoder->protected == 0) {
 183                 free(encoder);
 184                 return 0;
 185         }
 186         encoder->private = (FLAC__StreamEncoderPrivate*)malloc(sizeof(FLAC__StreamEncoderPrivate));
 187         if(encoder->private == 0) {
 188                 free(encoder->protected);
 189                 free(encoder);
 190                 return 0;
 191         }
 192
 193         encoder->protected->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 194
 195         encoder->protected->streamable_subset = true;
 196         encoder->protected->do_mid_side_stereo = false;
 197         encoder->protected->loose_mid_side_stereo = false;
 198         encoder->protected->channels = 2;
 199         encoder->protected->bits_per_sample = 16;
 200         encoder->protected->sample_rate = 44100;
 201         encoder->protected->blocksize = 1152;
 202         encoder->protected->max_lpc_order = 0;
 203         encoder->protected->qlp_coeff_precision = 0;
 204         encoder->protected->do_qlp_coeff_prec_search = false;
 205         encoder->protected->do_exhaustive_model_search = false;
 206         encoder->protected->do_escape_coding = false;
 207         encoder->protected->min_residual_partition_order = 0;
 208         encoder->protected->max_residual_partition_order = 0;
 209         encoder->protected->rice_parameter_search_dist = 0;
 210         encoder->protected->total_samples_estimate = 0;
 211         encoder->protected->seek_table = 0;
 212         encoder->protected->padding = 0;
 213         encoder->protected->last_metadata_is_last = true;
 214
 215         encoder->private->write_callback = 0;
 216         encoder->private->metadata_callback = 0;
 217         encoder->private->client_data = 0;
 218
 219         return encoder;
 220 }
 221
 222 void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder)
 223 {
 224         FLAC__ASSERT(encoder != 0);
 225         FLAC__ASSERT(encoder->protected != 0);
 226         FLAC__ASSERT(encoder->private != 0);
 227
 228         free(encoder->private);
 229         free(encoder->protected);
 230         free(encoder);
 231 }
 232
 233 /***********************************************************************
 234  *
 235  * Public class methods
 236  *
 237  ***********************************************************************/
 238
 239 FLAC__StreamEncoderState FLAC__stream_encoder_init(FLAC__StreamEncoder *encoder)
 240 {
 241         unsigned i;
 242         FLAC__StreamMetaData padding_block;
 243         FLAC__StreamMetaData seek_table_block;
 244
 245         FLAC__ASSERT(encoder != 0);
 246
 247         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 248                 return encoder->protected->state = FLAC__STREAM_ENCODER_ALREADY_INITIALIZED;
 249
 250         encoder->protected->state = FLAC__STREAM_ENCODER_OK;
 251
 252         if(0 == encoder->private->write_callback || 0 == encoder->private->metadata_callback)
 253                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_CALLBACK;
 254
 255         if(encoder->protected->channels == 0 || encoder->protected->channels > FLAC__MAX_CHANNELS)
 256                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS;
 257
 258         if(encoder->protected->do_mid_side_stereo && encoder->protected->channels != 2)
 259                 return encoder->protected->state = FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH;
 260
 261         if(encoder->protected->loose_mid_side_stereo && !encoder->protected->do_mid_side_stereo)
 262                 return encoder->protected->state = FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE;
 263
 264         if(encoder->protected->bits_per_sample >= 32)
 265                 encoder->protected->do_mid_side_stereo = false; /* since we do 32-bit math, the side channel would have 33 bps and overflow */
 266
 267         if(encoder->protected->bits_per_sample < FLAC__MIN_BITS_PER_SAMPLE || encoder->protected->bits_per_sample > FLAC__MAX_BITS_PER_SAMPLE)
 268                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE;
 269
 270         if(encoder->protected->sample_rate == 0 || encoder->protected->sample_rate > FLAC__MAX_SAMPLE_RATE)
 271                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE;
 272
 273         if(encoder->protected->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->protected->blocksize > FLAC__MAX_BLOCK_SIZE)
 274                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE;
 275
 276         if(encoder->protected->blocksize < encoder->protected->max_lpc_order)
 277                 return encoder->protected->state = FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER;
 278
 279         if(encoder->protected->qlp_coeff_precision == 0) {
 280                 if(encoder->protected->bits_per_sample < 16) {
 281                         /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */
 282                         /* @@@ until then we'll make a guess */
 283                         encoder->protected->qlp_coeff_precision = max(5, 2 + encoder->protected->bits_per_sample / 2);
 284                 }
 285                 else if(encoder->protected->bits_per_sample == 16) {
 286                         if(encoder->protected->blocksize <= 192)
 287                                 encoder->protected->qlp_coeff_precision = 7;
 288                         else if(encoder->protected->blocksize <= 384)
 289                                 encoder->protected->qlp_coeff_precision = 8;
 290                         else if(encoder->protected->blocksize <= 576)
 291                                 encoder->protected->qlp_coeff_precision = 9;
 292                         else if(encoder->protected->blocksize <= 1152)
 293                                 encoder->protected->qlp_coeff_precision = 10;
 294                         else if(encoder->protected->blocksize <= 2304)
 295                                 encoder->protected->qlp_coeff_precision = 11;
 296                         else if(encoder->protected->blocksize <= 4608)
 297                                 encoder->protected->qlp_coeff_precision = 12;
 298                         else
 299                                 encoder->protected->qlp_coeff_precision = 13;
 300                 }
 301                 else {
 302                         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 */
 303                 }
 304         }
 305         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))
 306                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION;
 307
 308         if(encoder->protected->streamable_subset) {
 309                 /*@@@ add check for blocksize here */
 310                 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)
 311                         return encoder->protected->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 312                 if(encoder->protected->sample_rate > 655350)
 313                         return encoder->protected->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 314         }
 315
 316         if(encoder->protected->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
 317                 encoder->protected->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
 318         if(encoder->protected->min_residual_partition_order >= encoder->protected->max_residual_partition_order)
 319                 encoder->protected->min_residual_partition_order = encoder->protected->max_residual_partition_order;
 320
 321         encoder->private->input_capacity = 0;
 322         for(i = 0; i < encoder->protected->channels; i++) {
 323                 encoder->private->integer_signal_unaligned[i] = encoder->private->integer_signal[i] = 0;
 324                 encoder->private->real_signal_unaligned[i] = encoder->private->real_signal[i] = 0;
 325         }
 326         for(i = 0; i < 2; i++) {
 327                 encoder->private->integer_signal_mid_side_unaligned[i] = encoder->private->integer_signal_mid_side[i] = 0;
 328                 encoder->private->real_signal_mid_side_unaligned[i] = encoder->private->real_signal_mid_side[i] = 0;
 329         }
 330         for(i = 0; i < encoder->protected->channels; i++) {
 331                 encoder->private->residual_workspace_unaligned[i][0] = encoder->private->residual_workspace[i][0] = 0;
 332                 encoder->private->residual_workspace_unaligned[i][1] = encoder->private->residual_workspace[i][1] = 0;
 333                 encoder->private->best_subframe[i] = 0;
 334         }
 335         for(i = 0; i < 2; i++) {
 336                 encoder->private->residual_workspace_mid_side_unaligned[i][0] = encoder->private->residual_workspace_mid_side[i][0] = 0;
 337                 encoder->private->residual_workspace_mid_side_unaligned[i][1] = encoder->private->residual_workspace_mid_side[i][1] = 0;
 338                 encoder->private->best_subframe_mid_side[i] = 0;
 339         }
 340         for(i = 0; i < encoder->protected->channels; i++) {
 341                 encoder->private->subframe_workspace_ptr[i][0] = &encoder->private->subframe_workspace[i][0];
 342                 encoder->private->subframe_workspace_ptr[i][1] = &encoder->private->subframe_workspace[i][1];
 343         }
 344         for(i = 0; i < 2; i++) {
 345                 encoder->private->subframe_workspace_ptr_mid_side[i][0] = &encoder->private->subframe_workspace_mid_side[i][0];
 346                 encoder->private->subframe_workspace_ptr_mid_side[i][1] = &encoder->private->subframe_workspace_mid_side[i][1];
 347         }
 348         encoder->private->abs_residual_unaligned = encoder->private->abs_residual = 0;
 349         encoder->private->abs_residual_partition_sums_unaligned = encoder->private->abs_residual_partition_sums = 0;
 350         encoder->private->raw_bits_per_partition_unaligned = encoder->private->raw_bits_per_partition = 0;
 351         encoder->private->loose_mid_side_stereo_frames_exact = (double)encoder->protected->sample_rate * 0.4 / (double)encoder->protected->blocksize;
 352         encoder->private->loose_mid_side_stereo_frames = (unsigned)(encoder->private->loose_mid_side_stereo_frames_exact + 0.5);
 353         if(encoder->private->loose_mid_side_stereo_frames == 0)
 354                 encoder->private->loose_mid_side_stereo_frames = 1;
 355         encoder->private->loose_mid_side_stereo_frame_count = 0;
 356         encoder->private->current_sample_number = 0;
 357         encoder->private->current_frame_number = 0;
 358
 359         encoder->private->use_wide_by_block = (encoder->protected->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected->blocksize)+1 > 30);
 360         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? */
 361         encoder->private->use_wide_by_partition = (false); /*@@@ need to set this */
 362
 363         /*
 364          * get the CPU info and set the function pointers
 365          */
 366         FLAC__cpu_info(&encoder->private->cpuinfo);
 367         /* first default to the non-asm routines */
 368         encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation;
 369         encoder->private->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor;
 370         encoder->private->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients;
 371         encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients;
 372         /* now override with asm where appropriate */
 373 #ifndef FLAC__NO_ASM
 374         FLAC__ASSERT(encoder->private->cpuinfo.use_asm);
 375 #ifdef FLAC__CPU_IA32
 376         FLAC__ASSERT(encoder->private->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 377 #ifdef FLAC__HAS_NASM
 378         if(0 && encoder->private->cpuinfo.data.ia32.sse) { /*@@@ SSE version lacks necessary resolution, plus SSE flag doesn't check for OS support */
 379                 if(encoder->protected->max_lpc_order < 4)
 380                         encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_4;
 381                 else if(encoder->protected->max_lpc_order < 8)
 382                         encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_8;
 383                 else if(encoder->protected->max_lpc_order < 12)
 384                         encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_12;
 385                 else
 386                         encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 387         }
 388         else if(0 && encoder->private->cpuinfo.data.ia32._3dnow) /*@@@ turn back on in first beta after 1.0 */
 389                 encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_3dnow;
 390         else
 391                 encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 392         if(encoder->private->cpuinfo.data.ia32.mmx && encoder->private->cpuinfo.data.ia32.cmov)
 393                 encoder->private->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov;
 394         if(encoder->private->cpuinfo.data.ia32.mmx) {
 395                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 396                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx;
 397         }
 398         else {
 399                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 400                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 401         }
 402 #endif
 403 #endif
 404 #endif
 405         /* finally override based on wide-ness if necessary */
 406         if(encoder->private->use_wide_by_block) {
 407                 encoder->private->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_wide;
 408         }
 409
 410         /* we require precompute_partition_sums if do_escape_coding because of their intertwined nature */
 411         encoder->private->precompute_partition_sums = (encoder->protected->max_residual_partition_order > encoder->protected->min_residual_partition_order) || encoder->protected->do_escape_coding;
 412
 413         if(!stream_encoder_resize_buffers_(encoder, encoder->protected->blocksize)) {
 414                 /* the above function sets the state for us in case of an error */
 415                 return encoder->protected->state;
 416         }
 417         FLAC__bitbuffer_init(&encoder->private->frame);
 418
 419         /*
 420          * write the stream header
 421          */
 422
 423         if(!FLAC__bitbuffer_clear(&encoder->private->frame))
 424                 return encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 425         if(!FLAC__bitbuffer_write_raw_uint32(&encoder->private->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN))
 426                 return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 427
 428         encoder->private->metadata.type = FLAC__METADATA_TYPE_STREAMINFO;
 429         encoder->private->metadata.is_last = (encoder->protected->seek_table == 0 && encoder->protected->padding == 0 && encoder->protected->last_metadata_is_last);
 430         encoder->private->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
 431         encoder->private->metadata.data.stream_info.min_blocksize = encoder->protected->blocksize; /* this encoder uses the same blocksize for the whole stream */
 432         encoder->private->metadata.data.stream_info.max_blocksize = encoder->protected->blocksize;
 433         encoder->private->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
 434         encoder->private->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
 435         encoder->private->metadata.data.stream_info.sample_rate = encoder->protected->sample_rate;
 436         encoder->private->metadata.data.stream_info.channels = encoder->protected->channels;
 437         encoder->private->metadata.data.stream_info.bits_per_sample = encoder->protected->bits_per_sample;
 438         encoder->private->metadata.data.stream_info.total_samples = encoder->protected->total_samples_estimate; /* we will replace this later with the real total */
 439         memset(encoder->private->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
 440         MD5Init(&encoder->private->md5context);
 441         if(!FLAC__add_metadata_block(&encoder->private->metadata, &encoder->private->frame))
 442                 return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 443
 444         if(0 != encoder->protected->seek_table) {
 445                 if(!FLAC__seek_table_is_valid(encoder->protected->seek_table))
 446                         return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_SEEK_TABLE;
 447                 seek_table_block.type = FLAC__METADATA_TYPE_SEEKTABLE;
 448                 seek_table_block.is_last = (encoder->protected->padding == 0 && encoder->protected->last_metadata_is_last);
 449                 seek_table_block.length = encoder->protected->seek_table->num_points * FLAC__STREAM_METADATA_SEEKPOINT_LEN;
 450                 seek_table_block.data.seek_table = *encoder->protected->seek_table;
 451                 if(!FLAC__add_metadata_block(&seek_table_block, &encoder->private->frame))
 452                         return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 453         }
 454
 455         /* add a PADDING block if requested */
 456         if(encoder->protected->padding > 0) {
 457                 padding_block.type = FLAC__METADATA_TYPE_PADDING;
 458                 padding_block.is_last = encoder->protected->last_metadata_is_last;
 459                 padding_block.length = encoder->protected->padding;
 460                 if(!FLAC__add_metadata_block(&padding_block, &encoder->private->frame))
 461                         return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 462         }
 463
 464         FLAC__ASSERT(encoder->private->frame.bits == 0); /* assert that we're byte-aligned before writing */
 465         FLAC__ASSERT(encoder->private->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */
 466         if(encoder->private->write_callback(encoder, encoder->private->frame.buffer, encoder->private->frame.bytes, 0, encoder->private->current_frame_number, encoder->private->client_data) != FLAC__STREAM_ENCODER_WRITE_OK)
 467                 return encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
 468
 469         /* now that the metadata block is written, we can init this to an absurdly-high value... */
 470         encoder->private->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
 471         /* ... and clear this to 0 */
 472         encoder->private->metadata.data.stream_info.total_samples = 0;
 473
 474         return encoder->protected->state;
 475 }
 476
 477 void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder)
 478 {
 479         unsigned i, channel;
 480
 481         FLAC__ASSERT(encoder != 0);
 482         if(encoder->protected->state == FLAC__STREAM_ENCODER_UNINITIALIZED)
 483                 return;
 484         if(encoder->private->current_sample_number != 0) {
 485                 encoder->protected->blocksize = encoder->private->current_sample_number;
 486                 stream_encoder_process_frame_(encoder, true); /* true => is last frame */
 487         }
 488         MD5Final(encoder->private->metadata.data.stream_info.md5sum, &encoder->private->md5context);
 489         encoder->private->metadata_callback(encoder, &encoder->private->metadata, encoder->private->client_data);
 490         for(i = 0; i < encoder->protected->channels; i++) {
 491                 if(encoder->private->integer_signal_unaligned[i] != 0) {
 492                         free(encoder->private->integer_signal_unaligned[i]);
 493                         encoder->private->integer_signal_unaligned[i] = 0;
 494                 }
 495                 if(encoder->private->real_signal_unaligned[i] != 0) {
 496                         free(encoder->private->real_signal_unaligned[i]);
 497                         encoder->private->real_signal_unaligned[i] = 0;
 498                 }
 499         }
 500         for(i = 0; i < 2; i++) {
 501                 if(encoder->private->integer_signal_mid_side_unaligned[i] != 0) {
 502                         free(encoder->private->integer_signal_mid_side_unaligned[i]);
 503                         encoder->private->integer_signal_mid_side_unaligned[i] = 0;
 504                 }
 505                 if(encoder->private->real_signal_mid_side_unaligned[i] != 0) {
 506                         free(encoder->private->real_signal_mid_side_unaligned[i]);
 507                         encoder->private->real_signal_mid_side_unaligned[i] = 0;
 508                 }
 509         }
 510         for(channel = 0; channel < encoder->protected->channels; channel++) {
 511                 for(i = 0; i < 2; i++) {
 512                         if(encoder->private->residual_workspace_unaligned[channel][i] != 0) {
 513                                 free(encoder->private->residual_workspace_unaligned[channel][i]);
 514                                 encoder->private->residual_workspace_unaligned[channel][i] = 0;
 515                         }
 516                 }
 517         }
 518         for(channel = 0; channel < 2; channel++) {
 519                 for(i = 0; i < 2; i++) {
 520                         if(encoder->private->residual_workspace_mid_side_unaligned[channel][i] != 0) {
 521                                 free(encoder->private->residual_workspace_mid_side_unaligned[channel][i]);
 522                                 encoder->private->residual_workspace_mid_side_unaligned[channel][i] = 0;
 523                         }
 524                 }
 525         }
 526         if(encoder->private->abs_residual_unaligned != 0) {
 527                 free(encoder->private->abs_residual_unaligned);
 528                 encoder->private->abs_residual_unaligned = 0;
 529         }
 530         if(encoder->private->abs_residual_partition_sums_unaligned != 0) {
 531                 free(encoder->private->abs_residual_partition_sums_unaligned);
 532                 encoder->private->abs_residual_partition_sums_unaligned = 0;
 533         }
 534         if(encoder->private->raw_bits_per_partition_unaligned != 0) {
 535                 free(encoder->private->raw_bits_per_partition_unaligned);
 536                 encoder->private->raw_bits_per_partition_unaligned = 0;
 537         }
 538         FLAC__bitbuffer_free(&encoder->private->frame);
 539
 540         encoder->protected->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 541 }
 542
 543 FLAC__bool FLAC__stream_encoder_set_streamable_subset(const FLAC__StreamEncoder *encoder, FLAC__bool value)
 544 {
 545         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 546                 return false;
 547         encoder->protected->streamable_subset = value;
 548         return true;
 549 }
 550
 551 FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(const FLAC__StreamEncoder *encoder, FLAC__bool value)
 552 {
 553         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 554                 return false;
 555         encoder->protected->do_mid_side_stereo = value;
 556         return true;
 557 }
 558
 559 FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder, FLAC__bool value)
 560 {
 561         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 562                 return false;
 563         encoder->protected->loose_mid_side_stereo = value;
 564         return true;
 565 }
 566
 567 FLAC__bool FLAC__stream_encoder_set_channels(const FLAC__StreamEncoder *encoder, unsigned value)
 568 {
 569         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 570                 return false;
 571         encoder->protected->channels = value;
 572         return true;
 573 }
 574
 575 FLAC__bool FLAC__stream_encoder_set_bits_per_sample(const FLAC__StreamEncoder *encoder, unsigned value)
 576 {
 577         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 578                 return false;
 579         encoder->protected->bits_per_sample = value;
 580         return true;
 581 }
 582
 583 FLAC__bool FLAC__stream_encoder_set_sample_rate(const FLAC__StreamEncoder *encoder, unsigned value)
 584 {
 585         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 586                 return false;
 587         encoder->protected->sample_rate = value;
 588         return true;
 589 }
 590
 591 FLAC__bool FLAC__stream_encoder_set_blocksize(const FLAC__StreamEncoder *encoder, unsigned value)
 592 {
 593         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 594                 return false;
 595         encoder->protected->blocksize = value;
 596         return true;
 597 }
 598
 599 FLAC__bool FLAC__stream_encoder_set_max_lpc_order(const FLAC__StreamEncoder *encoder, unsigned value)
 600 {
 601         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 602                 return false;
 603         encoder->protected->max_lpc_order = value;
 604         return true;
 605 }
 606
 607 FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(const FLAC__StreamEncoder *encoder, unsigned value)
 608 {
 609         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 610                 return false;
 611         encoder->protected->qlp_coeff_precision = value;
 612         return true;
 613 }
 614
 615 FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder, FLAC__bool value)
 616 {
 617         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 618                 return false;
 619         encoder->protected->do_qlp_coeff_prec_search = value;
 620         return true;
 621 }
 622
 623 FLAC__bool FLAC__stream_encoder_set_do_escape_coding(const FLAC__StreamEncoder *encoder, FLAC__bool value)
 624 {
 625         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 626                 return false;
 627         encoder->protected->do_escape_coding = value;
 628         return true;
 629 }
 630
 631 FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder, FLAC__bool value)
 632 {
 633         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 634                 return false;
 635         encoder->protected->do_exhaustive_model_search = value;
 636         return true;
 637 }
 638
 639 FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(const FLAC__StreamEncoder *encoder, unsigned value)
 640 {
 641         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 642                 return false;
 643         encoder->protected->min_residual_partition_order = value;
 644         return true;
 645 }
 646
 647 FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(const FLAC__StreamEncoder *encoder, unsigned value)
 648 {
 649         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 650                 return false;
 651         encoder->protected->max_residual_partition_order = value;
 652         return true;
 653 }
 654
 655 FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder, unsigned value)
 656 {
 657         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 658                 return false;
 659         encoder->protected->rice_parameter_search_dist = value;
 660         return true;
 661 }
 662
 663 FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(const FLAC__StreamEncoder *encoder, FLAC__uint64 value)
 664 {
 665         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 666                 return false;
 667         encoder->protected->total_samples_estimate = value;
 668         return true;
 669 }
 670
 671 FLAC__bool FLAC__stream_encoder_set_seek_table(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData_SeekTable *value)
 672 {
 673         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 674                 return false;
 675         encoder->protected->seek_table = value;
 676         return true;
 677 }
 678
 679 FLAC__bool FLAC__stream_encoder_set_padding(const FLAC__StreamEncoder *encoder, unsigned value)
 680 {
 681         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 682                 return false;
 683         encoder->protected->padding = value;
 684         return true;
 685 }
 686
 687 FLAC__bool FLAC__stream_encoder_set_last_metadata_is_last(const FLAC__StreamEncoder *encoder, FLAC__bool value)
 688 {
 689         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 690                 return false;
 691         encoder->protected->last_metadata_is_last = value;
 692         return true;
 693 }
 694
 695 FLAC__bool FLAC__stream_encoder_set_write_callback(const FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteStatus (*value)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data))
 696 {
 697         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 698                 return false;
 699         encoder->private->write_callback = value;
 700         return true;
 701 }
 702
 703 FLAC__bool FLAC__stream_encoder_set_metadata_callback(const FLAC__StreamEncoder *encoder, void (*value)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data))
 704 {
 705         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 706                 return false;
 707         encoder->private->metadata_callback = value;
 708         return true;
 709 }
 710
 711 FLAC__bool FLAC__stream_encoder_set_client_data(const FLAC__StreamEncoder *encoder, void *value)
 712 {
 713         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 714                 return false;
 715         encoder->private->client_data = value;
 716         return true;
 717 }
 718
 719 FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder)
 720 {
 721         return encoder->protected->state;
 722 }
 723
 724 FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder)
 725 {
 726         return encoder->protected->streamable_subset;
 727 }
 728
 729 FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder)
 730 {
 731         return encoder->protected->do_mid_side_stereo;
 732 }
 733
 734 FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder)
 735 {
 736         return encoder->protected->loose_mid_side_stereo;
 737 }
 738
 739 unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder)
 740 {
 741         return encoder->protected->channels;
 742 }
 743
 744 unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder)
 745 {
 746         return encoder->protected->bits_per_sample;
 747 }
 748
 749 unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder)
 750 {
 751         return encoder->protected->sample_rate;
 752 }
 753
 754 unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder)
 755 {
 756         return encoder->protected->blocksize;
 757 }
 758
 759 unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder)
 760 {
 761         return encoder->protected->max_lpc_order;
 762 }
 763
 764 unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder)
 765 {
 766         return encoder->protected->qlp_coeff_precision;
 767 }
 768
 769 FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder)
 770 {
 771         return encoder->protected->do_qlp_coeff_prec_search;
 772 }
 773
 774 FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder)
 775 {
 776         return encoder->protected->do_escape_coding;
 777 }
 778
 779 FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder)
 780 {
 781         return encoder->protected->do_exhaustive_model_search;
 782 }
 783
 784 unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder)
 785 {
 786         return encoder->protected->min_residual_partition_order;
 787 }
 788
 789 unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder)
 790 {
 791         return encoder->protected->max_residual_partition_order;
 792 }
 793
 794 unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder)
 795 {
 796         return encoder->protected->rice_parameter_search_dist;
 797 }
 798
 799 FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 *buf[], unsigned samples)
 800 {
 801         unsigned i, j, channel;
 802         FLAC__int32 x, mid, side;
 803         const unsigned channels = encoder->protected->channels, blocksize = encoder->protected->blocksize;
 804
 805         FLAC__ASSERT(encoder != 0);
 806         FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK);
 807
 808         j = 0;
 809         if(encoder->protected->do_mid_side_stereo && channels == 2) {
 810                 do {
 811                         for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) {
 812                                 x = mid = side = buf[0][j];
 813                                 encoder->private->integer_signal[0][i] = x;
 814                                 encoder->private->real_signal[0][i] = (FLAC__real)x;
 815                                 x = buf[1][j];
 816                                 encoder->private->integer_signal[1][i] = x;
 817                                 encoder->private->real_signal[1][i] = (FLAC__real)x;
 818                                 mid += x;
 819                                 side -= x;
 820                                 mid >>= 1; /* NOTE: not the same as 'mid = (buf[0][j] + buf[1][j]) / 2' ! */
 821                                 encoder->private->integer_signal_mid_side[1][i] = side;
 822                                 encoder->private->integer_signal_mid_side[0][i] = mid;
 823                                 encoder->private->real_signal_mid_side[1][i] = (FLAC__real)side;
 824                                 encoder->private->real_signal_mid_side[0][i] = (FLAC__real)mid;
 825                                 encoder->private->current_sample_number++;
 826                         }
 827                         if(i == blocksize) {
 828                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 829                                         return false;
 830                         }
 831                 } while(j < samples);
 832         }
 833         else {
 834                 do {
 835                         for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) {
 836                                 for(channel = 0; channel < channels; channel++) {
 837                                         x = buf[channel][j];
 838                                         encoder->private->integer_signal[channel][i] = x;
 839                                         encoder->private->real_signal[channel][i] = (FLAC__real)x;
 840                                 }
 841                                 encoder->private->current_sample_number++;
 842                         }
 843                         if(i == blocksize) {
 844                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 845                                         return false;
 846                         }
 847                 } while(j < samples);
 848         }
 849
 850         return true;
 851 }
 852
 853 /* 'samples' is channel-wide samples, e.g. for 1 second at 44100Hz, 'samples' = 44100 regardless of the number of channels */
 854 FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buf[], unsigned samples)
 855 {
 856         unsigned i, j, k, channel;
 857         FLAC__int32 x, mid, side;
 858         const unsigned channels = encoder->protected->channels, blocksize = encoder->protected->blocksize;
 859
 860         FLAC__ASSERT(encoder != 0);
 861         FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK);
 862
 863         j = k = 0;
 864         if(encoder->protected->do_mid_side_stereo && channels == 2) {
 865                 do {
 866                         for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) {
 867                                 x = mid = side = buf[k++];
 868                                 encoder->private->integer_signal[0][i] = x;
 869                                 encoder->private->real_signal[0][i] = (FLAC__real)x;
 870                                 x = buf[k++];
 871                                 encoder->private->integer_signal[1][i] = x;
 872                                 encoder->private->real_signal[1][i] = (FLAC__real)x;
 873                                 mid += x;
 874                                 side -= x;
 875                                 mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
 876                                 encoder->private->integer_signal_mid_side[1][i] = side;
 877                                 encoder->private->integer_signal_mid_side[0][i] = mid;
 878                                 encoder->private->real_signal_mid_side[1][i] = (FLAC__real)side;
 879                                 encoder->private->real_signal_mid_side[0][i] = (FLAC__real)mid;
 880                                 encoder->private->current_sample_number++;
 881                         }
 882                         if(i == blocksize) {
 883                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 884                                         return false;
 885                         }
 886                 } while(j < samples);
 887         }
 888         else {
 889                 do {
 890                         for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) {
 891                                 for(channel = 0; channel < channels; channel++) {
 892                                         x = buf[k++];
 893                                         encoder->private->integer_signal[channel][i] = x;
 894                                         encoder->private->real_signal[channel][i] = (FLAC__real)x;
 895                                 }
 896                                 encoder->private->current_sample_number++;
 897                         }
 898                         if(i == blocksize) {
 899                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 900                                         return false;
 901                         }
 902                 } while(j < samples);
 903         }
 904
 905         return true;
 906 }
 907
 908 FLAC__bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size)
 909 {
 910         FLAC__bool ok;
 911         unsigned i, channel;
 912
 913         FLAC__ASSERT(new_size > 0);
 914         FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK);
 915         FLAC__ASSERT(encoder->private->current_sample_number == 0);
 916
 917         /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */
 918         if(new_size <= encoder->private->input_capacity)
 919                 return true;
 920
 921         ok = true;
 922
 923         /* 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. */
 924
 925         for(i = 0; ok && i < encoder->protected->channels; i++) {
 926                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private->integer_signal_unaligned[i], &encoder->private->integer_signal[i]);
 927                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private->real_signal_unaligned[i], &encoder->private->real_signal[i]);
 928                 memset(encoder->private->integer_signal[i], 0, sizeof(FLAC__int32)*4);
 929                 encoder->private->integer_signal[i] += 4;
 930         }
 931         for(i = 0; ok && i < 2; i++) {
 932                 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]);
 933                 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]);
 934                 memset(encoder->private->integer_signal_mid_side[i], 0, sizeof(FLAC__int32)*4);
 935                 encoder->private->integer_signal_mid_side[i] += 4;
 936         }
 937         for(channel = 0; ok && channel < encoder->protected->channels; channel++) {
 938                 for(i = 0; ok && i < 2; i++) {
 939                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private->residual_workspace_unaligned[channel][i], &encoder->private->residual_workspace[channel][i]);
 940                 }
 941         }
 942         for(channel = 0; ok && channel < 2; channel++) {
 943                 for(i = 0; ok && i < 2; i++) {
 944                         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]);
 945                 }
 946         }
 947         ok = ok && FLAC__memory_alloc_aligned_uint32_array(new_size, &encoder->private->abs_residual_unaligned, &encoder->private->abs_residual);
 948         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 */
 949                 ok = ok && FLAC__memory_alloc_aligned_uint64_array(new_size * 2, &encoder->private->abs_residual_partition_sums_unaligned, &encoder->private->abs_residual_partition_sums);
 950         if(encoder->protected->do_escape_coding)
 951                 ok = ok && FLAC__memory_alloc_aligned_unsigned_array(new_size * 2, &encoder->private->raw_bits_per_partition_unaligned, &encoder->private->raw_bits_per_partition);
 952
 953         if(ok)
 954                 encoder->private->input_capacity = new_size;
 955         else
 956                 encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 957
 958         return ok;
 959 }
 960
 961 /***********************************************************************
 962  *
 963  * Private class methods
 964  *
 965  ***********************************************************************/
 966
 967 FLAC__bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame)
 968 {
 969         FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK);
 970
 971         /*
 972          * Accumulate raw signal to the MD5 signature
 973          */
 974         /* 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: */
 975         if(!FLAC__MD5Accumulate(&encoder->private->md5context, encoder->private->integer_signal, encoder->protected->channels, encoder->protected->blocksize, (encoder->protected->bits_per_sample+7) / 8)) {
 976                 encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 977                 return false;
 978         }
 979
 980         /*
 981          * Process the frame header and subframes into the frame bitbuffer
 982          */
 983         if(!stream_encoder_process_subframes_(encoder, is_last_frame)) {
 984                 /* the above function sets the state for us in case of an error */
 985                 return false;
 986         }
 987
 988         /*
 989          * Zero-pad the frame to a byte_boundary
 990          */
 991         if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(&encoder->private->frame)) {
 992                 encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 993                 return false;
 994         }
 995
 996         /*
 997          * CRC-16 the whole thing
 998          */
 999         FLAC__ASSERT(encoder->private->frame.bits == 0); /* assert that we're byte-aligned */
1000         FLAC__ASSERT(encoder->private->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */
1001         FLAC__bitbuffer_write_raw_uint32(&encoder->private->frame, FLAC__crc16(encoder->private->frame.buffer, encoder->private->frame.bytes), FLAC__FRAME_FOOTER_CRC_LEN);
1002
1003         /*
1004          * Write it
1005          */
1006         if(encoder->private->write_callback(encoder, encoder->private->frame.buffer, encoder->private->frame.bytes, encoder->protected->blocksize, encoder->private->current_frame_number, encoder->private->client_data) != FLAC__STREAM_ENCODER_WRITE_OK) {
1007                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
1008                 return false;
1009         }
1010
1011         /*
1012          * Get ready for the next frame
1013          */
1014         encoder->private->current_sample_number = 0;
1015         encoder->private->current_frame_number++;
1016         encoder->private->metadata.data.stream_info.total_samples += (FLAC__uint64)encoder->protected->blocksize;
1017         encoder->private->metadata.data.stream_info.min_framesize = min(encoder->private->frame.bytes, encoder->private->metadata.data.stream_info.min_framesize);
1018         encoder->private->metadata.data.stream_info.max_framesize = max(encoder->private->frame.bytes, encoder->private->metadata.data.stream_info.max_framesize);
1019
1020         return true;
1021 }
1022
1023 FLAC__bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame)
1024 {
1025         FLAC__FrameHeader frame_header;
1026         unsigned channel, min_partition_order = encoder->protected->min_residual_partition_order, max_partition_order;
1027         FLAC__bool do_independent, do_mid_side, precompute_partition_sums;
1028
1029         /*
1030          * Calculate the min,max Rice partition orders
1031          */
1032         if(is_last_frame) {
1033                 max_partition_order = 0;
1034         }
1035         else {
1036                 unsigned limit = 0, b = encoder->protected->blocksize;
1037                 while(!(b & 1)) {
1038                         limit++;
1039                         b >>= 1;
1040                 }
1041                 max_partition_order = min(encoder->protected->max_residual_partition_order, limit);
1042         }
1043         min_partition_order = min(min_partition_order, max_partition_order);
1044
1045         precompute_partition_sums = encoder->private->precompute_partition_sums && ((max_partition_order > min_partition_order) || encoder->protected->do_escape_coding);
1046
1047         /*
1048          * Setup the frame
1049          */
1050         if(!FLAC__bitbuffer_clear(&encoder->private->frame)) {
1051                 encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1052                 return false;
1053         }
1054         frame_header.blocksize = encoder->protected->blocksize;
1055         frame_header.sample_rate = encoder->protected->sample_rate;
1056         frame_header.channels = encoder->protected->channels;
1057         frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
1058         frame_header.bits_per_sample = encoder->protected->bits_per_sample;
1059         frame_header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
1060         frame_header.number.frame_number = encoder->private->current_frame_number;
1061
1062         /*
1063          * Figure out what channel assignments to try
1064          */
1065         if(encoder->protected->do_mid_side_stereo) {
1066                 if(encoder->protected->loose_mid_side_stereo) {
1067                         if(encoder->private->loose_mid_side_stereo_frame_count == 0) {
1068                                 do_independent = true;
1069                                 do_mid_side = true;
1070                         }
1071                         else {
1072                                 do_independent = (encoder->private->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
1073                                 do_mid_side = !do_independent;
1074                         }
1075                 }
1076                 else {
1077                         do_independent = true;
1078                         do_mid_side = true;
1079                 }
1080         }
1081         else {
1082                 do_independent = true;
1083                 do_mid_side = false;
1084         }
1085
1086         FLAC__ASSERT(do_independent || do_mid_side);
1087
1088         /*
1089          * Check for wasted bits; set effective bps for each subframe
1090          */
1091         if(do_independent) {
1092                 unsigned w;
1093                 for(channel = 0; channel < encoder->protected->channels; channel++) {
1094                         w = stream_encoder_get_wasted_bits_(encoder->private->integer_signal[channel], encoder->protected->blocksize);
1095                         encoder->private->subframe_workspace[channel][0].wasted_bits = encoder->private->subframe_workspace[channel][1].wasted_bits = w;
1096                         encoder->private->subframe_bps[channel] = encoder->protected->bits_per_sample - w;
1097                 }
1098         }
1099         if(do_mid_side) {
1100                 unsigned w;
1101                 FLAC__ASSERT(encoder->protected->channels == 2);
1102                 for(channel = 0; channel < 2; channel++) {
1103                         w = stream_encoder_get_wasted_bits_(encoder->private->integer_signal_mid_side[channel], encoder->protected->blocksize);
1104                         encoder->private->subframe_workspace_mid_side[channel][0].wasted_bits = encoder->private->subframe_workspace_mid_side[channel][1].wasted_bits = w;
1105                         encoder->private->subframe_bps_mid_side[channel] = encoder->protected->bits_per_sample - w + (channel==0? 0:1);
1106                 }
1107         }
1108
1109         /*
1110          * First do a normal encoding pass of each independent channel
1111          */
1112         if(do_independent) {
1113                 for(channel = 0; channel < encoder->protected->channels; channel++) {
1114                         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))
1115                                 return false;
1116                 }
1117         }
1118
1119         /*
1120          * Now do mid and side channels if requested
1121          */
1122         if(do_mid_side) {
1123                 FLAC__ASSERT(encoder->protected->channels == 2);
1124
1125                 for(channel = 0; channel < 2; channel++) {
1126                         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))
1127                                 return false;
1128                 }
1129         }
1130
1131         /*
1132          * Compose the frame bitbuffer
1133          */
1134         if(do_mid_side) {
1135                 unsigned left_bps = 0, right_bps = 0; /* initialized only to prevent superfluous compiler warning */
1136                 FLAC__Subframe *left_subframe = 0, *right_subframe = 0; /* initialized only to prevent superfluous compiler warning */
1137                 FLAC__ChannelAssignment channel_assignment;
1138
1139                 FLAC__ASSERT(encoder->protected->channels == 2);
1140
1141                 if(encoder->protected->loose_mid_side_stereo && encoder->private->loose_mid_side_stereo_frame_count > 0) {
1142                         channel_assignment = (encoder->private->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE);
1143                 }
1144                 else {
1145                         unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
1146                         unsigned min_bits;
1147                         FLAC__ChannelAssignment ca;
1148
1149                         FLAC__ASSERT(do_independent && do_mid_side);
1150
1151                         /* We have to figure out which channel assignent results in the smallest frame */
1152                         bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->private->best_subframe_bits         [0] + encoder->private->best_subframe_bits         [1];
1153                         bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE  ] = encoder->private->best_subframe_bits         [0] + encoder->private->best_subframe_bits_mid_side[1];
1154                         bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->private->best_subframe_bits         [1] + encoder->private->best_subframe_bits_mid_side[1];
1155                         bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE   ] = encoder->private->best_subframe_bits_mid_side[0] + encoder->private->best_subframe_bits_mid_side[1];
1156
1157                         for(channel_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) {
1158                                 if(bits[ca] < min_bits) {
1159                                         min_bits = bits[ca];
1160                                         channel_assignment = ca;
1161                                 }
1162                         }
1163                 }
1164
1165                 frame_header.channel_assignment = channel_assignment;
1166
1167                 if(!FLAC__frame_add_header(&frame_header, encoder->protected->streamable_subset, is_last_frame, &encoder->private->frame)) {
1168                         encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1169                         return false;
1170                 }
1171
1172                 switch(channel_assignment) {
1173                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1174                                 left_subframe  = &encoder->private->subframe_workspace         [0][encoder->private->best_subframe         [0]];
1175                                 right_subframe = &encoder->private->subframe_workspace         [1][encoder->private->best_subframe         [1]];
1176                                 break;
1177                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1178                                 left_subframe  = &encoder->private->subframe_workspace         [0][encoder->private->best_subframe         [0]];
1179                                 right_subframe = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]];
1180                                 break;
1181                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1182                                 left_subframe  = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]];
1183                                 right_subframe = &encoder->private->subframe_workspace         [1][encoder->private->best_subframe         [1]];
1184                                 break;
1185                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1186                                 left_subframe  = &encoder->private->subframe_workspace_mid_side[0][encoder->private->best_subframe_mid_side[0]];
1187                                 right_subframe = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]];
1188                                 break;
1189                         default:
1190                                 FLAC__ASSERT(0);
1191                 }
1192
1193                 switch(channel_assignment) {
1194                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1195                                 left_bps  = encoder->private->subframe_bps         [0];
1196                                 right_bps = encoder->private->subframe_bps         [1];
1197                                 break;
1198                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1199                                 left_bps  = encoder->private->subframe_bps         [0];
1200                                 right_bps = encoder->private->subframe_bps_mid_side[1];
1201                                 break;
1202                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1203                                 left_bps  = encoder->private->subframe_bps_mid_side[1];
1204                                 right_bps = encoder->private->subframe_bps         [1];
1205                                 break;
1206                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1207                                 left_bps  = encoder->private->subframe_bps_mid_side[0];
1208                                 right_bps = encoder->private->subframe_bps_mid_side[1];
1209                                 break;
1210                         default:
1211                                 FLAC__ASSERT(0);
1212                 }
1213
1214                 /* note that encoder_add_subframe_ sets the state for us in case of an error */
1215                 if(!stream_encoder_add_subframe_(encoder, &frame_header, left_bps , left_subframe , &encoder->private->frame))
1216                         return false;
1217                 if(!stream_encoder_add_subframe_(encoder, &frame_header, right_bps, right_subframe, &encoder->private->frame))
1218                         return false;
1219         }
1220         else {
1221                 if(!FLAC__frame_add_header(&frame_header, encoder->protected->streamable_subset, is_last_frame, &encoder->private->frame)) {
1222                         encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1223                         return false;
1224                 }
1225
1226                 for(channel = 0; channel < encoder->protected->channels; channel++) {
1227                         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)) {
1228                                 /* the above function sets the state for us in case of an error */
1229                                 return false;
1230                         }
1231                 }
1232         }
1233
1234         if(encoder->protected->loose_mid_side_stereo) {
1235                 encoder->private->loose_mid_side_stereo_frame_count++;
1236                 if(encoder->private->loose_mid_side_stereo_frame_count >= encoder->private->loose_mid_side_stereo_frames)
1237                         encoder->private->loose_mid_side_stereo_frame_count = 0;
1238         }
1239
1240         encoder->private->last_channel_assignment = frame_header.channel_assignment;
1241
1242         return true;
1243 }
1244
1245 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)
1246 {
1247         FLAC__real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
1248         FLAC__real lpc_residual_bits_per_sample;
1249         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 */
1250         FLAC__real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER];
1251         FLAC__real lpc_error[FLAC__MAX_LPC_ORDER];
1252         unsigned min_lpc_order, max_lpc_order, lpc_order;
1253         unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
1254         unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
1255         unsigned rice_parameter;
1256         unsigned _candidate_bits, _best_bits;
1257         unsigned _best_subframe;
1258
1259         /* verbatim subframe is the baseline against which we measure other compressed subframes */
1260         _best_subframe = 0;
1261         _best_bits = stream_encoder_evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
1262
1263         if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
1264                 /* check for constant subframe */
1265                 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);
1266                 if(fixed_residual_bits_per_sample[1] == 0.0) {
1267                         /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
1268                         unsigned i, signal_is_constant = true;
1269                         for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
1270                                 if(integer_signal[0] != integer_signal[i]) {
1271                                         signal_is_constant = false;
1272                                         break;
1273                                 }
1274                         }
1275                         if(signal_is_constant) {
1276                                 _candidate_bits = stream_encoder_evaluate_constant_subframe_(integer_signal[0], subframe_bps, subframe[!_best_subframe]);
1277                                 if(_candidate_bits < _best_bits) {
1278                                         _best_subframe = !_best_subframe;
1279                                         _best_bits = _candidate_bits;
1280                                 }
1281                         }
1282                 }
1283                 else {
1284                         /* encode fixed */
1285                         if(encoder->protected->do_exhaustive_model_search) {
1286                                 min_fixed_order = 0;
1287                                 max_fixed_order = FLAC__MAX_FIXED_ORDER;
1288                         }
1289                         else {
1290                                 min_fixed_order = max_fixed_order = guess_fixed_order;
1291                         }
1292                         for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
1293                                 if(fixed_residual_bits_per_sample[fixed_order] >= (FLAC__real)subframe_bps)
1294                                         continue; /* don't even try */
1295                                 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 */
1296 #ifndef FLAC__SYMMETRIC_RICE
1297                                 rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1298 #endif
1299                                 if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1300 #ifdef DEBUG
1301                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @0\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1302 #endif
1303                                         rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1304                                 }
1305                                 _candidate_bits = stream_encoder_evaluate_fixed_subframe_(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]);
1306                                 if(_candidate_bits < _best_bits) {
1307                                         _best_subframe = !_best_subframe;
1308                                         _best_bits = _candidate_bits;
1309                                 }
1310                         }
1311
1312                         /* encode lpc */
1313                         if(encoder->protected->max_lpc_order > 0) {
1314                                 if(encoder->protected->max_lpc_order >= frame_header->blocksize)
1315                                         max_lpc_order = frame_header->blocksize-1;
1316                                 else
1317                                         max_lpc_order = encoder->protected->max_lpc_order;
1318                                 if(max_lpc_order > 0) {
1319                                         encoder->private->local_lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc);
1320                                         /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */
1321                                         if(autoc[0] != 0.0) {
1322                                                 FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, lp_coeff, lpc_error);
1323                                                 if(encoder->protected->do_exhaustive_model_search) {
1324                                                         min_lpc_order = 1;
1325                                                 }
1326                                                 else {
1327                                                         unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, subframe_bps);
1328                                                         min_lpc_order = max_lpc_order = guess_lpc_order;
1329                                                 }
1330                                                 if(encoder->protected->do_qlp_coeff_prec_search) {
1331                                                         min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
1332                                                         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 */
1333                                                 }
1334                                                 else {
1335                                                         min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->protected->qlp_coeff_precision;
1336                                                 }
1337                                                 for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
1338                                                         lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order);
1339                                                         if(lpc_residual_bits_per_sample >= (FLAC__real)subframe_bps)
1340                                                                 continue; /* don't even try */
1341                                                         rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */
1342 #ifndef FLAC__SYMMETRIC_RICE
1343                                                         rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1344 #endif
1345                                                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1346 #ifdef DEBUG
1347                                                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @1\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1348 #endif
1349                                                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1350                                                         }
1351                                                         for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
1352                                                                 _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, 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]);
1353                                                                 if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
1354                                                                         if(_candidate_bits < _best_bits) {
1355                                                                                 _best_subframe = !_best_subframe;
1356                                                                                 _best_bits = _candidate_bits;
1357                                                                         }
1358                                                                 }
1359                                                         }
1360                                                 }
1361                                         }
1362                                 }
1363                         }
1364                 }
1365         }
1366
1367         *best_subframe = _best_subframe;
1368         *best_bits = _best_bits;
1369
1370         return true;
1371 }
1372
1373 FLAC__bool stream_encoder_add_subframe_(FLAC__StreamEncoder *encoder, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame)
1374 {
1375         switch(subframe->type) {
1376                 case FLAC__SUBFRAME_TYPE_CONSTANT:
1377                         if(!FLAC__subframe_add_constant(&(subframe->data.constant), subframe_bps, subframe->wasted_bits, frame)) {
1378                                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1379                                 return false;
1380                         }
1381                         break;
1382                 case FLAC__SUBFRAME_TYPE_FIXED:
1383                         if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, subframe_bps, subframe->wasted_bits, frame)) {
1384                                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1385                                 return false;
1386                         }
1387                         break;
1388                 case FLAC__SUBFRAME_TYPE_LPC:
1389                         if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, subframe_bps, subframe->wasted_bits, frame)) {
1390                                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1391                                 return false;
1392                         }
1393                         break;
1394                 case FLAC__SUBFRAME_TYPE_VERBATIM:
1395                         if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, subframe_bps, subframe->wasted_bits, frame)) {
1396                                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1397                                 return false;
1398                         }
1399                         break;
1400                 default:
1401                         FLAC__ASSERT(0);
1402         }
1403
1404         return true;
1405 }
1406
1407 unsigned stream_encoder_evaluate_constant_subframe_(const FLAC__int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe)
1408 {
1409         subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT;
1410         subframe->data.constant.value = signal;
1411
1412         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe_bps;
1413 }
1414
1415 unsigned stream_encoder_evaluate_fixed_subframe_(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)
1416 {
1417         unsigned i, residual_bits;
1418         const unsigned residual_samples = blocksize - order;
1419
1420         FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual);
1421
1422         subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
1423
1424         subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
1425         subframe->data.fixed.residual = residual;
1426
1427         residual_bits = stream_encoder_find_best_partition_order_(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);
1428
1429         subframe->data.fixed.order = order;
1430         for(i = 0; i < order; i++)
1431                 subframe->data.fixed.warmup[i] = signal[i];
1432
1433         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (order * subframe_bps) + residual_bits;
1434 }
1435
1436 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)
1437 {
1438         FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
1439         unsigned i, residual_bits;
1440         int quantization, ret;
1441         const unsigned residual_samples = blocksize - order;
1442
1443         ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, subframe_bps, qlp_coeff, &quantization);
1444         if(ret != 0)
1445                 return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */
1446
1447         if(subframe_bps <= 16 && qlp_coeff_precision <= 16)
1448                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
1449         else
1450                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
1451
1452         subframe->type = FLAC__SUBFRAME_TYPE_LPC;
1453
1454         subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
1455         subframe->data.lpc.residual = residual;
1456
1457         residual_bits = stream_encoder_find_best_partition_order_(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);
1458
1459         subframe->data.lpc.order = order;
1460         subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision;
1461         subframe->data.lpc.quantization_level = quantization;
1462         memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(FLAC__int32)*FLAC__MAX_LPC_ORDER);
1463         for(i = 0; i < order; i++)
1464                 subframe->data.lpc.warmup[i] = signal[i];
1465
1466         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;
1467 }
1468
1469 unsigned stream_encoder_evaluate_verbatim_subframe_(const FLAC__int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe)
1470 {
1471         subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
1472
1473         subframe->data.verbatim.data = signal;
1474
1475         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (blocksize * subframe_bps);
1476 }
1477
1478 unsigned stream_encoder_find_best_partition_order_(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[])
1479 {
1480         FLAC__int32 r;
1481         unsigned residual_bits, best_residual_bits = 0;
1482         unsigned residual_sample;
1483         unsigned best_parameters_index = 0, parameters[2][1 << FLAC__MAX_RICE_PARTITION_ORDER], raw_bits[2][1 << FLAC__MAX_RICE_PARTITION_ORDER];
1484         const unsigned blocksize = residual_samples + predictor_order;
1485
1486         /* compute abs(residual) for use later */
1487         for(residual_sample = 0; residual_sample < residual_samples; residual_sample++) {
1488                 r = residual[residual_sample];
1489                 abs_residual[residual_sample] = (FLAC__uint32)(r<0? -r : r);
1490         }
1491
1492         while(max_partition_order > 0 && blocksize >> max_partition_order <= predictor_order)
1493                 max_partition_order--;
1494         FLAC__ASSERT(blocksize >> max_partition_order > predictor_order);
1495         min_partition_order = min(min_partition_order, max_partition_order);
1496
1497         if(precompute_partition_sums) {
1498                 int partition_order;
1499                 unsigned sum;
1500
1501                 stream_encoder_precompute_partition_info_sums_(abs_residual, abs_residual_partition_sums, residual_samples, predictor_order, min_partition_order, max_partition_order);
1502
1503                 if(do_escape_coding)
1504                         stream_encoder_precompute_partition_info_escapes_(residual, raw_bits_per_partition, residual_samples, predictor_order, min_partition_order, max_partition_order);
1505
1506                 for(partition_order = (int)max_partition_order, sum = 0; partition_order >= (int)min_partition_order; partition_order--) {
1507 #ifdef DONT_ESTIMATE_RICE_BITS
1508                         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, parameters[!best_parameters_index], raw_bits[!best_parameters_index], &residual_bits))
1509 #else
1510                         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, parameters[!best_parameters_index], raw_bits[!best_parameters_index], &residual_bits))
1511 #endif
1512                         {
1513                                 FLAC__ASSERT(best_residual_bits != 0);
1514                                 break;
1515                         }
1516                         sum += 1u << partition_order;
1517                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1518                                 best_residual_bits = residual_bits;
1519                                 *best_partition_order = partition_order;
1520                                 best_parameters_index = !best_parameters_index;
1521                         }
1522                 }
1523         }
1524         else {
1525                 unsigned partition_order;
1526                 for(partition_order = min_partition_order; partition_order <= max_partition_order; partition_order++) {
1527 #ifdef DONT_ESTIMATE_RICE_BITS
1528                         if(!stream_encoder_set_partitioned_rice_(abs_residual, residual, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, partition_order, parameters[!best_parameters_index], &residual_bits))
1529 #else
1530                         if(!stream_encoder_set_partitioned_rice_(abs_residual, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, partition_order, parameters[!best_parameters_index], &residual_bits))
1531 #endif
1532                         {
1533                                 FLAC__ASSERT(best_residual_bits != 0);
1534                                 break;
1535                         }
1536                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1537                                 best_residual_bits = residual_bits;
1538                                 *best_partition_order = partition_order;
1539                                 best_parameters_index = !best_parameters_index;
1540                         }
1541                 }
1542         }
1543
1544         memcpy(best_parameters, parameters[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1545         memcpy(best_raw_bits, raw_bits[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1546
1547         return best_residual_bits;
1548 }
1549
1550 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)
1551 {
1552         int partition_order;
1553         unsigned from_partition, to_partition = 0;
1554         const unsigned blocksize = residual_samples + predictor_order;
1555
1556         /* first do max_partition_order */
1557         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
1558                 FLAC__uint64 abs_residual_partition_sum;
1559                 FLAC__uint32 abs_r;
1560                 unsigned partition, partition_sample, partition_samples, residual_sample;
1561                 const unsigned partitions = 1u << partition_order;
1562                 const unsigned default_partition_samples = blocksize >> partition_order;
1563
1564                 FLAC__ASSERT(default_partition_samples > predictor_order);
1565
1566                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1567                         partition_samples = default_partition_samples;
1568                         if(partition == 0)
1569                                 partition_samples -= predictor_order;
1570                         abs_residual_partition_sum = 0;
1571                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
1572                                 abs_r = abs_residual[residual_sample];
1573                                 abs_residual_partition_sum += abs_r;
1574                                 residual_sample++;
1575                         }
1576                         abs_residual_partition_sums[partition] = abs_residual_partition_sum;
1577                 }
1578                 to_partition = partitions;
1579                 break;
1580         }
1581
1582         /* now merge partitions for lower orders */
1583         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
1584                 FLAC__uint64 s;
1585                 unsigned i;
1586                 const unsigned partitions = 1u << partition_order;
1587                 for(i = 0; i < partitions; i++) {
1588                         s = abs_residual_partition_sums[from_partition];
1589                         from_partition++;
1590                         abs_residual_partition_sums[to_partition] = s + abs_residual_partition_sums[from_partition];
1591                         from_partition++;
1592                         to_partition++;
1593                 }
1594         }
1595 }
1596
1597 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)
1598 {
1599         int partition_order;
1600         unsigned from_partition, to_partition = 0;
1601         const unsigned blocksize = residual_samples + predictor_order;
1602
1603         /* first do max_partition_order */
1604         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
1605                 FLAC__int32 r, residual_partition_min, residual_partition_max;
1606                 unsigned silog2_min, silog2_max;
1607                 unsigned partition, partition_sample, partition_samples, residual_sample;
1608                 const unsigned partitions = 1u << partition_order;
1609                 const unsigned default_partition_samples = blocksize >> partition_order;
1610
1611                 FLAC__ASSERT(default_partition_samples > predictor_order);
1612
1613                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1614                         partition_samples = default_partition_samples;
1615                         if(partition == 0)
1616                                 partition_samples -= predictor_order;
1617                         residual_partition_min = residual_partition_max = 0;
1618                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
1619                                 r = residual[residual_sample];
1620                                 if(r < residual_partition_min)
1621                                         residual_partition_min = r;
1622                                 else if(r > residual_partition_max)
1623                                         residual_partition_max = r;
1624                                 residual_sample++;
1625                         }
1626                         silog2_min = FLAC__bitmath_silog2(residual_partition_min);
1627                         silog2_max = FLAC__bitmath_silog2(residual_partition_max);
1628                         raw_bits_per_partition[partition] = max(silog2_min, silog2_max);
1629                 }
1630                 to_partition = partitions;
1631                 break;
1632         }
1633
1634         /* now merge partitions for lower orders */
1635         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
1636                 unsigned m;
1637                 unsigned i;
1638                 const unsigned partitions = 1u << partition_order;
1639                 for(i = 0; i < partitions; i++) {
1640                         m = raw_bits_per_partition[from_partition];
1641                         from_partition++;
1642                         raw_bits_per_partition[to_partition] = max(m, raw_bits_per_partition[from_partition]);
1643                         from_partition++;
1644                         to_partition++;
1645                 }
1646         }
1647 }
1648
1649 #ifdef VARIABLE_RICE_BITS
1650 #undef VARIABLE_RICE_BITS
1651 #endif
1652 #ifndef DONT_ESTIMATE_RICE_BITS
1653 #define VARIABLE_RICE_BITS(value, parameter) ((value) >> (parameter))
1654 #endif
1655
1656 #ifdef DONT_ESTIMATE_RICE_BITS
1657 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)
1658 #else
1659 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)
1660 #endif
1661 {
1662         unsigned rice_parameter, partition_bits;
1663 #ifndef NO_RICE_SEARCH
1664         unsigned best_partition_bits;
1665         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
1666 #endif
1667         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
1668
1669         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
1670
1671         if(partition_order == 0) {
1672                 unsigned i;
1673
1674 #ifndef NO_RICE_SEARCH
1675                 if(rice_parameter_search_dist) {
1676                         if(suggested_rice_parameter < rice_parameter_search_dist)
1677                                 min_rice_parameter = 0;
1678                         else
1679                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
1680                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
1681                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1682 #ifdef DEBUG
1683                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @2\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1684 #endif
1685                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1686                         }
1687                 }
1688                 else
1689                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
1690
1691                 best_partition_bits = 0xffffffff;
1692                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1693 #endif
1694 #ifdef VARIABLE_RICE_BITS
1695 #ifdef FLAC__SYMMETRIC_RICE
1696                         partition_bits = (2+rice_parameter) * residual_samples;
1697 #else
1698                         const unsigned rice_parameter_estimate = rice_parameter-1;
1699                         partition_bits = (1+rice_parameter) * residual_samples;
1700 #endif
1701 #else
1702                         partition_bits = 0;
1703 #endif
1704                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1705                         for(i = 0; i < residual_samples; i++) {
1706 #ifdef VARIABLE_RICE_BITS
1707 #ifdef FLAC__SYMMETRIC_RICE
1708                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
1709 #else
1710                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
1711 #endif
1712 #else
1713                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] in addition to abs_residual[] */
1714 #endif
1715                         }
1716 #ifndef NO_RICE_SEARCH
1717                         if(partition_bits < best_partition_bits) {
1718                                 best_rice_parameter = rice_parameter;
1719                                 best_partition_bits = partition_bits;
1720                         }
1721                 }
1722 #endif
1723                 parameters[0] = best_rice_parameter;
1724                 bits_ += best_partition_bits;
1725         }
1726         else {
1727                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
1728                 unsigned partition_samples;
1729                 FLAC__uint64 mean, k;
1730                 const unsigned partitions = 1u << partition_order;
1731                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1732                         partition_samples = (residual_samples+predictor_order) >> partition_order;
1733                         if(partition == 0) {
1734                                 if(partition_samples <= predictor_order)
1735                                         return false;
1736                                 else
1737                                         partition_samples -= predictor_order;
1738                         }
1739                         mean = 0;
1740                         save_residual_sample = residual_sample;
1741                         for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++)
1742                                 mean += abs_residual[residual_sample];
1743                         residual_sample = save_residual_sample;
1744 #ifdef FLAC__SYMMETRIC_RICE
1745                         mean += partition_samples >> 1; /* for rounding effect */
1746                         mean /= partition_samples;
1747
1748                         /* calc rice_parameter = floor(log2(mean)) */
1749                         rice_parameter = 0;
1750                         mean>>=1;
1751                         while(mean) {
1752                                 rice_parameter++;
1753                                 mean >>= 1;
1754                         }
1755 #else
1756                         /* calc rice_parameter ala LOCO-I */
1757                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
1758                                 ;
1759 #endif
1760                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1761 #ifdef DEBUG
1762                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @3\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1763 #endif
1764                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1765                         }
1766
1767 #ifndef NO_RICE_SEARCH
1768                         if(rice_parameter_search_dist) {
1769                                 if(rice_parameter < rice_parameter_search_dist)
1770                                         min_rice_parameter = 0;
1771                                 else
1772                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
1773                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
1774                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1775 #ifdef DEBUG
1776                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @4\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1777 #endif
1778                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1779                                 }
1780                         }
1781                         else
1782                                 min_rice_parameter = max_rice_parameter = rice_parameter;
1783
1784                         best_partition_bits = 0xffffffff;
1785                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1786 #endif
1787 #ifdef VARIABLE_RICE_BITS
1788 #ifdef FLAC__SYMMETRIC_RICE
1789                                 partition_bits = (2+rice_parameter) * partition_samples;
1790 #else
1791                                 const unsigned rice_parameter_estimate = rice_parameter-1;
1792                                 partition_bits = (1+rice_parameter) * partition_samples;
1793 #endif
1794 #else
1795                                 partition_bits = 0;
1796 #endif
1797                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1798                                 save_residual_sample = residual_sample;
1799                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
1800 #ifdef VARIABLE_RICE_BITS
1801 #ifdef FLAC__SYMMETRIC_RICE
1802                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
1803 #else
1804                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
1805 #endif
1806 #else
1807                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] in addition to abs_residual[] */
1808 #endif
1809                                 }
1810 #ifndef NO_RICE_SEARCH
1811                                 if(rice_parameter != max_rice_parameter)
1812                                         residual_sample = save_residual_sample;
1813                                 if(partition_bits < best_partition_bits) {
1814                                         best_rice_parameter = rice_parameter;
1815                                         best_partition_bits = partition_bits;
1816                                 }
1817                         }
1818 #endif
1819                         parameters[partition] = best_rice_parameter;
1820                         bits_ += best_partition_bits;
1821                 }
1822         }
1823
1824         *bits = bits_;
1825         return true;
1826 }
1827
1828 #ifdef DONT_ESTIMATE_RICE_BITS
1829 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)
1830 #else
1831 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)
1832 #endif
1833 {
1834         unsigned rice_parameter, partition_bits;
1835 #ifndef NO_RICE_SEARCH
1836         unsigned best_partition_bits;
1837         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
1838 #endif
1839         unsigned flat_bits;
1840         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
1841
1842         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
1843
1844         if(partition_order == 0) {
1845                 unsigned i;
1846
1847 #ifndef NO_RICE_SEARCH
1848                 if(rice_parameter_search_dist) {
1849                         if(suggested_rice_parameter < rice_parameter_search_dist)
1850                                 min_rice_parameter = 0;
1851                         else
1852                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
1853                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
1854                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1855 #ifdef DEBUG
1856                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @5\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1857 #endif
1858                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1859                         }
1860                 }
1861                 else
1862                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
1863
1864                 best_partition_bits = 0xffffffff;
1865                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1866 #endif
1867 #ifdef VARIABLE_RICE_BITS
1868 #ifdef FLAC__SYMMETRIC_RICE
1869                         partition_bits = (2+rice_parameter) * residual_samples;
1870 #else
1871                         const unsigned rice_parameter_estimate = rice_parameter-1;
1872                         partition_bits = (1+rice_parameter) * residual_samples;
1873 #endif
1874 #else
1875                         partition_bits = 0;
1876 #endif
1877                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1878                         for(i = 0; i < residual_samples; i++) {
1879 #ifdef VARIABLE_RICE_BITS
1880 #ifdef FLAC__SYMMETRIC_RICE
1881                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
1882 #else
1883                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
1884 #endif
1885 #else
1886                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
1887 #endif
1888                         }
1889 #ifndef NO_RICE_SEARCH
1890                         if(partition_bits < best_partition_bits) {
1891                                 best_rice_parameter = rice_parameter;
1892                                 best_partition_bits = partition_bits;
1893                         }
1894                 }
1895 #endif
1896                 if(search_for_escapes) {
1897                         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;
1898                         if(flat_bits <= best_partition_bits) {
1899                                 raw_bits[0] = raw_bits_per_partition[0];
1900                                 best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
1901                                 best_partition_bits = flat_bits;
1902                         }
1903                 }
1904                 parameters[0] = best_rice_parameter;
1905                 bits_ += best_partition_bits;
1906         }
1907         else {
1908                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
1909                 unsigned partition_samples;
1910                 FLAC__uint64 mean, k;
1911                 const unsigned partitions = 1u << partition_order;
1912                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1913                         partition_samples = (residual_samples+predictor_order) >> partition_order;
1914                         if(partition == 0) {
1915                                 if(partition_samples <= predictor_order)
1916                                         return false;
1917                                 else
1918                                         partition_samples -= predictor_order;
1919                         }
1920                         mean = abs_residual_partition_sums[partition];
1921 #ifdef FLAC__SYMMETRIC_RICE
1922                         mean += partition_samples >> 1; /* for rounding effect */
1923                         mean /= partition_samples;
1924
1925                         /* calc rice_parameter = floor(log2(mean)) */
1926                         rice_parameter = 0;
1927                         mean>>=1;
1928                         while(mean) {
1929                                 rice_parameter++;
1930                                 mean >>= 1;
1931                         }
1932 #else
1933                         /* calc rice_parameter ala LOCO-I */
1934                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
1935                                 ;
1936 #endif
1937                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1938 #ifdef DEBUG
1939                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @6\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1940 #endif
1941                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1942                         }
1943
1944 #ifndef NO_RICE_SEARCH
1945                         if(rice_parameter_search_dist) {
1946                                 if(rice_parameter < rice_parameter_search_dist)
1947                                         min_rice_parameter = 0;
1948                                 else
1949                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
1950                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
1951                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1952 #ifdef DEBUG
1953                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @7\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1954 #endif
1955                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1956                                 }
1957                         }
1958                         else
1959                                 min_rice_parameter = max_rice_parameter = rice_parameter;
1960
1961                         best_partition_bits = 0xffffffff;
1962                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1963 #endif
1964 #ifdef VARIABLE_RICE_BITS
1965 #ifdef FLAC__SYMMETRIC_RICE
1966                                 partition_bits = (2+rice_parameter) * partition_samples;
1967 #else
1968                                 const unsigned rice_parameter_estimate = rice_parameter-1;
1969                                 partition_bits = (1+rice_parameter) * partition_samples;
1970 #endif
1971 #else
1972                                 partition_bits = 0;
1973 #endif
1974                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1975                                 save_residual_sample = residual_sample;
1976                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
1977 #ifdef VARIABLE_RICE_BITS
1978 #ifdef FLAC__SYMMETRIC_RICE
1979                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
1980 #else
1981                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
1982 #endif
1983 #else
1984                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
1985 #endif
1986                                 }
1987 #ifndef NO_RICE_SEARCH
1988                                 if(rice_parameter != max_rice_parameter)
1989                                         residual_sample = save_residual_sample;
1990                                 if(partition_bits < best_partition_bits) {
1991                                         best_rice_parameter = rice_parameter;
1992                                         best_partition_bits = partition_bits;
1993                                 }
1994                         }
1995 #endif
1996                         if(search_for_escapes) {
1997                                 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;
1998                                 if(flat_bits <= best_partition_bits) {
1999                                         raw_bits[partition] = raw_bits_per_partition[partition];
2000                                         best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2001                                         best_partition_bits = flat_bits;
2002                                 }
2003                         }
2004                         parameters[partition] = best_rice_parameter;
2005                         bits_ += best_partition_bits;
2006                 }
2007         }
2008
2009         *bits = bits_;
2010         return true;
2011 }
2012
2013 unsigned stream_encoder_get_wasted_bits_(FLAC__int32 signal[], unsigned samples)
2014 {
2015         unsigned i, shift;
2016         FLAC__int32 x = 0;
2017
2018         for(i = 0; i < samples && !(x&1); i++)
2019                 x |= signal[i];
2020
2021         if(x == 0) {
2022                 shift = 0;
2023         }
2024         else {
2025                 for(shift = 0; !(x&1); shift++)
2026                         x >>= 1;
2027         }
2028
2029         if(shift > 0) {
2030                 for(i = 0; i < samples; i++)
2031                          signal[i] >>= shift;
2032         }
2033
2034         return shift;
2035 }