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 bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size);
  53 static bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, bool is_last_frame);
  54 static bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, bool is_last_frame);
  55 static bool stream_encoder_process_subframe_(FLAC__StreamEncoder *encoder, unsigned min_partition_order, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits);
  56 static 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 int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe);
  58 static unsigned stream_encoder_evaluate_fixed_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], uint32 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, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe);
  59 static unsigned stream_encoder_evaluate_lpc_subframe_(FLAC__StreamEncoder *encoder, const int32 signal[], int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], const 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, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe);
  60 static unsigned stream_encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe);
  61 static unsigned stream_encoder_find_best_partition_order_(const int32 residual[], uint32 abs_residual[], uint32 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, unsigned rice_parameter_search_dist, unsigned *best_partition_order, unsigned best_parameters[], unsigned best_raw_bits[]);
  62 #if (defined FLAC__PRECOMPUTE_PARTITION_SUMS) || (defined FLAC__SEARCH_FOR_ESCAPES)
  63 static unsigned stream_encoder_precompute_partition_info_(const int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order);
  64 #endif
  65 static bool stream_encoder_set_partitioned_rice_(const uint32 abs_residual[], const uint32 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, unsigned parameters[], unsigned raw_bits[], unsigned *bits);
  66 static unsigned stream_encoder_get_wasted_bits_(int32 signal[], unsigned samples);
  67
  68 /***********************************************************************
  69  *
  70  * Private class data
  71  *
  72  ***********************************************************************/
  73
  74 typedef struct FLAC__StreamEncoderPrivate {
  75         unsigned input_capacity;                    /* current size (in samples) of the signal and residual buffers */
  76         int32 *integer_signal[FLAC__MAX_CHANNELS];  /* the integer version of the input signal */
  77         int32 *integer_signal_mid_side[2];          /* the integer version of the mid-side input signal (stereo only) */
  78         real *real_signal[FLAC__MAX_CHANNELS];      /* the floating-point version of the input signal */
  79         real *real_signal_mid_side[2];              /* the floating-point version of the mid-side input signal (stereo only) */
  80         unsigned subframe_bps[FLAC__MAX_CHANNELS];  /* the effective bits per sample of the input signal (stream bps - wasted bits) */
  81         unsigned subframe_bps_mid_side[2];          /* the effective bits per sample of the mid-side input signal (stream bps - wasted bits + 0/1) */
  82         int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */
  83         int32 *residual_workspace_mid_side[2][2];
  84         FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2];
  85         FLAC__Subframe subframe_workspace_mid_side[2][2];
  86         FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2];
  87         FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2];
  88         unsigned best_subframe[FLAC__MAX_CHANNELS]; /* index into the above workspaces */
  89         unsigned best_subframe_mid_side[2];
  90         unsigned best_subframe_bits[FLAC__MAX_CHANNELS]; /* size in bits of the best subframe for each channel */
  91         unsigned best_subframe_bits_mid_side[2];
  92         uint32 *abs_residual;                       /* workspace where abs(candidate residual) is stored */
  93         uint32 *abs_residual_partition_sums;        /* workspace where the sum of abs(candidate residual) for each partition is stored */
  94         unsigned *raw_bits_per_partition;           /* workspace where the sum of silog2(candidate residual) for each partition is stored */
  95         FLAC__BitBuffer frame;                      /* the current frame being worked on */
  96         double loose_mid_side_stereo_frames_exact;  /* exact number of frames the encoder will use before trying both independent and mid/side frames again */
  97         unsigned loose_mid_side_stereo_frames;      /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */
  98         unsigned loose_mid_side_stereo_frame_count; /* number of frames using the current channel assignment */
  99         FLAC__ChannelAssignment last_channel_assignment;
 100         FLAC__StreamMetaData metadata;
 101         unsigned current_sample_number;
 102         unsigned current_frame_number;
 103         struct MD5Context md5context;
 104         FLAC__CPUInfo cpuinfo;
 105         unsigned (*local_fixed_compute_best_predictor)(const int32 data[], unsigned data_len, real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
 106         void (*local_lpc_compute_autocorrelation)(const real data[], unsigned data_len, unsigned lag, real autoc[]);
 107         void (*local_lpc_compute_residual_from_qlp_coefficients)(const int32 data[], unsigned data_len, const int32 qlp_coeff[], unsigned order, int lp_quantization, int32 residual[]);
 108         void (*local_lpc_compute_residual_from_qlp_coefficients_16bit)(const int32 data[], unsigned data_len, const int32 qlp_coeff[], unsigned order, int lp_quantization, int32 residual[]);
 109         bool use_slow;                              /* use slow 64-bit versions of some functions */
 110         FLAC__StreamEncoderWriteStatus (*write_callback)(const FLAC__StreamEncoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
 111         void (*metadata_callback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data);
 112         void *client_data;
 113         /* unaligned (original) pointers to allocated data */
 114         int32 *integer_signal_unaligned[FLAC__MAX_CHANNELS];
 115         int32 *integer_signal_mid_side_unaligned[2];
 116         real *real_signal_unaligned[FLAC__MAX_CHANNELS];
 117         real *real_signal_mid_side_unaligned[2];
 118         int32 *residual_workspace_unaligned[FLAC__MAX_CHANNELS][2];
 119         int32 *residual_workspace_mid_side_unaligned[2][2];
 120         uint32 *abs_residual_unaligned;
 121         uint32 *abs_residual_partition_sums_unaligned;
 122         unsigned *raw_bits_per_partition_unaligned;
 123 } FLAC__StreamEncoderPrivate;
 124
 125 /***********************************************************************
 126  *
 127  * Public static class data
 128  *
 129  ***********************************************************************/
 130
 131 const char *FLAC__StreamEncoderStateString[] = {
 132         "FLAC__STREAM_ENCODER_OK",
 133         "FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS",
 134         "FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE",
 135         "FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE",
 136         "FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE",
 137         "FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION",
 138         "FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH",
 139         "FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH",
 140         "FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE",
 141         "FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER",
 142         "FLAC__STREAM_ENCODER_NOT_STREAMABLE",
 143         "FLAC__STREAM_ENCODER_FRAMING_ERROR",
 144         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING",
 145         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING",
 146         "FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR",
 147         "FLAC__STREAM_ENCODER_ALREADY_INITIALIZED",
 148         "FLAC__STREAM_ENCODER_UNINITIALIZED"
 149 };
 150
 151 const char *FLAC__StreamEncoderWriteStatusString[] = {
 152         "FLAC__STREAM_ENCODER_WRITE_OK",
 153         "FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR"
 154 };
 155
 156 /***********************************************************************
 157  *
 158  * Class constructor/destructor
 159  *
 160  ***********************************************************************/
 161 FLAC__StreamEncoder *FLAC__stream_encoder_new()
 162 {
 163         FLAC__StreamEncoder *encoder;
 164
 165         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 166
 167         encoder = (FLAC__StreamEncoder*)malloc(sizeof(FLAC__StreamEncoder));
 168         if(encoder == 0) {
 169                 return 0;
 170         }
 171         encoder->protected = (FLAC__StreamEncoderProtected*)malloc(sizeof(FLAC__StreamEncoderProtected));
 172         if(encoder->protected == 0) {
 173                 free(encoder);
 174                 return 0;
 175         }
 176         encoder->private = (FLAC__StreamEncoderPrivate*)malloc(sizeof(FLAC__StreamEncoderPrivate));
 177         if(encoder->private == 0) {
 178                 free(encoder->protected);
 179                 free(encoder);
 180                 return 0;
 181         }
 182
 183         encoder->protected->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 184
 185         return encoder;
 186 }
 187
 188 void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder)
 189 {
 190         FLAC__ASSERT(encoder != 0);
 191         FLAC__ASSERT(encoder->protected != 0);
 192         FLAC__ASSERT(encoder->private != 0);
 193
 194         free(encoder->private);
 195         free(encoder->protected);
 196         free(encoder);
 197 }
 198
 199 /***********************************************************************
 200  *
 201  * Public class methods
 202  *
 203  ***********************************************************************/
 204
 205 FLAC__StreamEncoderState FLAC__stream_encoder_init(
 206         FLAC__StreamEncoder *encoder,
 207         bool streamable_subset,
 208         bool do_mid_side_stereo,
 209         bool loose_mid_side_stereo,
 210         unsigned channels,
 211         unsigned bits_per_sample,
 212         unsigned sample_rate,
 213         unsigned blocksize,
 214         unsigned max_lpc_order,
 215         unsigned qlp_coeff_precision,
 216         bool do_qlp_coeff_prec_search,
 217         bool do_exhaustive_model_search,
 218         unsigned min_residual_partition_order,
 219         unsigned max_residual_partition_order,
 220         unsigned rice_parameter_search_dist,
 221         uint64 total_samples_estimate,
 222         const FLAC__StreamMetaData_SeekTable *seek_table,
 223         unsigned padding,
 224         bool last_metadata_is_last,
 225         FLAC__StreamEncoderWriteStatus (*write_callback)(const FLAC__StreamEncoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data),
 226         void (*metadata_callback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data),
 227         void *client_data)
 228 {
 229         unsigned i;
 230         FLAC__StreamMetaData padding_block;
 231         FLAC__StreamMetaData seek_table_block;
 232
 233         FLAC__ASSERT(encoder != 0);
 234         FLAC__ASSERT(write_callback != 0);
 235         FLAC__ASSERT(metadata_callback != 0);
 236
 237         if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
 238                 return encoder->protected->state = FLAC__STREAM_ENCODER_ALREADY_INITIALIZED;
 239
 240         encoder->protected->state = FLAC__STREAM_ENCODER_OK;
 241
 242         encoder->protected->streamable_subset = streamable_subset;
 243         encoder->protected->do_mid_side_stereo = do_mid_side_stereo;
 244         encoder->protected->loose_mid_side_stereo = loose_mid_side_stereo;
 245         encoder->protected->channels = channels;
 246         encoder->protected->bits_per_sample = bits_per_sample;
 247         encoder->protected->sample_rate = sample_rate;
 248         encoder->protected->blocksize = blocksize;
 249         encoder->protected->max_lpc_order = max_lpc_order;
 250         encoder->protected->qlp_coeff_precision = qlp_coeff_precision;
 251         encoder->protected->do_qlp_coeff_prec_search = do_qlp_coeff_prec_search;
 252         encoder->protected->do_exhaustive_model_search = do_exhaustive_model_search;
 253         encoder->protected->min_residual_partition_order = min_residual_partition_order;
 254         encoder->protected->max_residual_partition_order = max_residual_partition_order;
 255         encoder->protected->rice_parameter_search_dist = rice_parameter_search_dist;
 256         encoder->protected->total_samples_estimate = total_samples_estimate;
 257         encoder->protected->seek_table = seek_table;
 258
 259         if(encoder->protected->channels == 0 || encoder->protected->channels > FLAC__MAX_CHANNELS)
 260                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS;
 261
 262         if(encoder->protected->do_mid_side_stereo && encoder->protected->channels != 2)
 263                 return encoder->protected->state = FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH;
 264
 265         if(encoder->protected->loose_mid_side_stereo && !encoder->protected->do_mid_side_stereo)
 266                 return encoder->protected->state = FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE;
 267
 268         if(encoder->protected->bits_per_sample >= 32)
 269                 encoder->protected->do_mid_side_stereo = false; /* since we do 32-bit math, the side channel would have 33 bps and overflow */
 270
 271         if(encoder->protected->bits_per_sample < FLAC__MIN_BITS_PER_SAMPLE || encoder->protected->bits_per_sample > FLAC__MAX_BITS_PER_SAMPLE)
 272                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE;
 273
 274         if(encoder->protected->sample_rate == 0 || encoder->protected->sample_rate > FLAC__MAX_SAMPLE_RATE)
 275                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE;
 276
 277         if(encoder->protected->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->protected->blocksize > FLAC__MAX_BLOCK_SIZE)
 278                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE;
 279
 280         if(encoder->protected->blocksize < encoder->protected->max_lpc_order)
 281                 return encoder->protected->state = FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER;
 282
 283         if(encoder->protected->qlp_coeff_precision == 0) {
 284                 if(encoder->protected->bits_per_sample < 16) {
 285                         /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */
 286                         /* @@@ until then we'll make a guess */
 287                         encoder->protected->qlp_coeff_precision = max(5, 2 + encoder->protected->bits_per_sample / 2);
 288                 }
 289                 else if(encoder->protected->bits_per_sample == 16) {
 290                         if(encoder->protected->blocksize <= 192)
 291                                 encoder->protected->qlp_coeff_precision = 7;
 292                         else if(encoder->protected->blocksize <= 384)
 293                                 encoder->protected->qlp_coeff_precision = 8;
 294                         else if(encoder->protected->blocksize <= 576)
 295                                 encoder->protected->qlp_coeff_precision = 9;
 296                         else if(encoder->protected->blocksize <= 1152)
 297                                 encoder->protected->qlp_coeff_precision = 10;
 298                         else if(encoder->protected->blocksize <= 2304)
 299                                 encoder->protected->qlp_coeff_precision = 11;
 300                         else if(encoder->protected->blocksize <= 4608)
 301                                 encoder->protected->qlp_coeff_precision = 12;
 302                         else
 303                                 encoder->protected->qlp_coeff_precision = 13;
 304                 }
 305                 else {
 306                         encoder->protected->qlp_coeff_precision = min(13, 8*sizeof(int32) - encoder->protected->bits_per_sample - 1);
 307                 }
 308         }
 309         else if(encoder->protected->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->protected->qlp_coeff_precision + encoder->protected->bits_per_sample >= 8*sizeof(uint32) || encoder->protected->qlp_coeff_precision >= (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
 310                 return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION;
 311
 312         if(encoder->protected->streamable_subset) {
 313                 //@@@ add check for blocksize here
 314                 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)
 315                         return encoder->protected->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 316                 if(encoder->protected->sample_rate > 655350)
 317                         return encoder->protected->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
 318         }
 319
 320         if(encoder->protected->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
 321                 encoder->protected->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
 322         if(encoder->protected->min_residual_partition_order >= encoder->protected->max_residual_partition_order)
 323                 encoder->protected->min_residual_partition_order = encoder->protected->max_residual_partition_order;
 324
 325         encoder->private->input_capacity = 0;
 326         for(i = 0; i < encoder->protected->channels; i++) {
 327                 encoder->private->integer_signal_unaligned[i] = encoder->private->integer_signal[i] = 0;
 328                 encoder->private->real_signal_unaligned[i] = encoder->private->real_signal[i] = 0;
 329         }
 330         for(i = 0; i < 2; i++) {
 331                 encoder->private->integer_signal_mid_side_unaligned[i] = encoder->private->integer_signal_mid_side[i] = 0;
 332                 encoder->private->real_signal_mid_side_unaligned[i] = encoder->private->real_signal_mid_side[i] = 0;
 333         }
 334         for(i = 0; i < encoder->protected->channels; i++) {
 335                 encoder->private->residual_workspace_unaligned[i][0] = encoder->private->residual_workspace[i][0] = 0;
 336                 encoder->private->residual_workspace_unaligned[i][1] = encoder->private->residual_workspace[i][1] = 0;
 337                 encoder->private->best_subframe[i] = 0;
 338         }
 339         for(i = 0; i < 2; i++) {
 340                 encoder->private->residual_workspace_mid_side_unaligned[i][0] = encoder->private->residual_workspace_mid_side[i][0] = 0;
 341                 encoder->private->residual_workspace_mid_side_unaligned[i][1] = encoder->private->residual_workspace_mid_side[i][1] = 0;
 342                 encoder->private->best_subframe_mid_side[i] = 0;
 343         }
 344         for(i = 0; i < encoder->protected->channels; i++) {
 345                 encoder->private->subframe_workspace_ptr[i][0] = &encoder->private->subframe_workspace[i][0];
 346                 encoder->private->subframe_workspace_ptr[i][1] = &encoder->private->subframe_workspace[i][1];
 347         }
 348         for(i = 0; i < 2; i++) {
 349                 encoder->private->subframe_workspace_ptr_mid_side[i][0] = &encoder->private->subframe_workspace_mid_side[i][0];
 350                 encoder->private->subframe_workspace_ptr_mid_side[i][1] = &encoder->private->subframe_workspace_mid_side[i][1];
 351         }
 352         encoder->private->abs_residual_unaligned = encoder->private->abs_residual = 0;
 353         encoder->private->abs_residual_partition_sums_unaligned = encoder->private->abs_residual_partition_sums = 0;
 354         encoder->private->raw_bits_per_partition_unaligned = encoder->private->raw_bits_per_partition = 0;
 355         encoder->private->loose_mid_side_stereo_frames_exact = (double)encoder->protected->sample_rate * 0.4 / (double)encoder->protected->blocksize;
 356         encoder->private->loose_mid_side_stereo_frames = (unsigned)(encoder->private->loose_mid_side_stereo_frames_exact + 0.5);
 357         if(encoder->private->loose_mid_side_stereo_frames == 0)
 358                 encoder->private->loose_mid_side_stereo_frames = 1;
 359         encoder->private->loose_mid_side_stereo_frame_count = 0;
 360         encoder->private->current_sample_number = 0;
 361         encoder->private->current_frame_number = 0;
 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
 389                 encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
 390         if(encoder->private->cpuinfo.data.ia32.mmx && encoder->private->cpuinfo.data.ia32.cmov)
 391                 encoder->private->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov;
 392         if(encoder->private->cpuinfo.data.ia32.mmx) {
 393                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 394                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx;
 395         }
 396         else {
 397                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 398                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
 399         }
 400 #endif
 401 #endif
 402 #endif
 403
 404         if(encoder->protected->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected->blocksize)+1 > 30)
 405                 encoder->private->use_slow = true;
 406         else
 407                 encoder->private->use_slow = false;
 408
 409         if(!stream_encoder_resize_buffers_(encoder, encoder->protected->blocksize)) {
 410                 /* the above function sets the state for us in case of an error */
 411                 return encoder->protected->state;
 412         }
 413         FLAC__bitbuffer_init(&encoder->private->frame);
 414         encoder->private->write_callback = write_callback;
 415         encoder->private->metadata_callback = metadata_callback;
 416         encoder->private->client_data = client_data;
 417
 418         /*
 419          * write the stream header
 420          */
 421
 422         if(!FLAC__bitbuffer_clear(&encoder->private->frame))
 423                 return encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 424         if(!FLAC__bitbuffer_write_raw_uint32(&encoder->private->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN))
 425                 return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 426
 427         encoder->private->metadata.type = FLAC__METADATA_TYPE_STREAMINFO;
 428         encoder->private->metadata.is_last = (encoder->protected->seek_table == 0 && padding == 0 && last_metadata_is_last);
 429         encoder->private->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
 430         encoder->private->metadata.data.stream_info.min_blocksize = encoder->protected->blocksize; /* this encoder uses the same blocksize for the whole stream */
 431         encoder->private->metadata.data.stream_info.max_blocksize = encoder->protected->blocksize;
 432         encoder->private->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
 433         encoder->private->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
 434         encoder->private->metadata.data.stream_info.sample_rate = encoder->protected->sample_rate;
 435         encoder->private->metadata.data.stream_info.channels = encoder->protected->channels;
 436         encoder->private->metadata.data.stream_info.bits_per_sample = encoder->protected->bits_per_sample;
 437         encoder->private->metadata.data.stream_info.total_samples = encoder->protected->total_samples_estimate; /* we will replace this later with the real total */
 438         memset(encoder->private->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
 439         MD5Init(&encoder->private->md5context);
 440         if(!FLAC__add_metadata_block(&encoder->private->metadata, &encoder->private->frame))
 441                 return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 442
 443         if(0 != encoder->protected->seek_table) {
 444                 if(!FLAC__seek_table_is_valid(encoder->protected->seek_table))
 445                         return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_SEEK_TABLE;
 446                 seek_table_block.type = FLAC__METADATA_TYPE_SEEKTABLE;
 447                 seek_table_block.is_last = (padding == 0 && last_metadata_is_last);
 448                 seek_table_block.length = encoder->protected->seek_table->num_points * FLAC__STREAM_METADATA_SEEKPOINT_LEN;
 449                 seek_table_block.data.seek_table = *encoder->protected->seek_table;
 450                 if(!FLAC__add_metadata_block(&seek_table_block, &encoder->private->frame))
 451                         return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 452         }
 453
 454         /* add a PADDING block if requested */
 455         if(padding > 0) {
 456                 padding_block.type = FLAC__METADATA_TYPE_PADDING;
 457                 padding_block.is_last = last_metadata_is_last;
 458                 padding_block.length = padding;
 459                 if(!FLAC__add_metadata_block(&padding_block, &encoder->private->frame))
 460                         return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 461         }
 462
 463         FLAC__ASSERT(encoder->private->frame.bits == 0); /* assert that we're byte-aligned before writing */
 464         FLAC__ASSERT(encoder->private->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */
 465         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)
 466                 return encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
 467
 468         /* now that the metadata block is written, we can init this to an absurdly-high value... */
 469         encoder->private->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
 470         /* ... and clear this to 0 */
 471         encoder->private->metadata.data.stream_info.total_samples = 0;
 472
 473         return encoder->protected->state;
 474 }
 475
 476 void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder)
 477 {
 478         unsigned i, channel;
 479
 480         FLAC__ASSERT(encoder != 0);
 481         if(encoder->protected->state == FLAC__STREAM_ENCODER_UNINITIALIZED)
 482                 return;
 483         if(encoder->private->current_sample_number != 0) {
 484                 encoder->protected->blocksize = encoder->private->current_sample_number;
 485                 stream_encoder_process_frame_(encoder, true); /* true => is last frame */
 486         }
 487         MD5Final(encoder->private->metadata.data.stream_info.md5sum, &encoder->private->md5context);
 488         encoder->private->metadata_callback(encoder, &encoder->private->metadata, encoder->private->client_data);
 489         for(i = 0; i < encoder->protected->channels; i++) {
 490                 if(encoder->private->integer_signal_unaligned[i] != 0) {
 491                         free(encoder->private->integer_signal_unaligned[i]);
 492                         encoder->private->integer_signal_unaligned[i] = 0;
 493                 }
 494                 if(encoder->private->real_signal_unaligned[i] != 0) {
 495                         free(encoder->private->real_signal_unaligned[i]);
 496                         encoder->private->real_signal_unaligned[i] = 0;
 497                 }
 498         }
 499         for(i = 0; i < 2; i++) {
 500                 if(encoder->private->integer_signal_mid_side_unaligned[i] != 0) {
 501                         free(encoder->private->integer_signal_mid_side_unaligned[i]);
 502                         encoder->private->integer_signal_mid_side_unaligned[i] = 0;
 503                 }
 504                 if(encoder->private->real_signal_mid_side_unaligned[i] != 0) {
 505                         free(encoder->private->real_signal_mid_side_unaligned[i]);
 506                         encoder->private->real_signal_mid_side_unaligned[i] = 0;
 507                 }
 508         }
 509         for(channel = 0; channel < encoder->protected->channels; channel++) {
 510                 for(i = 0; i < 2; i++) {
 511                         if(encoder->private->residual_workspace_unaligned[channel][i] != 0) {
 512                                 free(encoder->private->residual_workspace_unaligned[channel][i]);
 513                                 encoder->private->residual_workspace_unaligned[channel][i] = 0;
 514                         }
 515                 }
 516         }
 517         for(channel = 0; channel < 2; channel++) {
 518                 for(i = 0; i < 2; i++) {
 519                         if(encoder->private->residual_workspace_mid_side_unaligned[channel][i] != 0) {
 520                                 free(encoder->private->residual_workspace_mid_side_unaligned[channel][i]);
 521                                 encoder->private->residual_workspace_mid_side_unaligned[channel][i] = 0;
 522                         }
 523                 }
 524         }
 525         if(encoder->private->abs_residual_unaligned != 0) {
 526                 free(encoder->private->abs_residual_unaligned);
 527                 encoder->private->abs_residual_unaligned = 0;
 528         }
 529         if(encoder->private->abs_residual_partition_sums_unaligned != 0) {
 530                 free(encoder->private->abs_residual_partition_sums_unaligned);
 531                 encoder->private->abs_residual_partition_sums_unaligned = 0;
 532         }
 533         if(encoder->private->raw_bits_per_partition_unaligned != 0) {
 534                 free(encoder->private->raw_bits_per_partition_unaligned);
 535                 encoder->private->raw_bits_per_partition_unaligned = 0;
 536         }
 537         FLAC__bitbuffer_free(&encoder->private->frame);
 538
 539         encoder->protected->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
 540 }
 541
 542 FLAC__StreamEncoderState FLAC__stream_encoder_state(const FLAC__StreamEncoder *encoder)
 543 {
 544         return encoder->protected->state;
 545 }
 546
 547 bool FLAC__stream_encoder_streamable_subset(const FLAC__StreamEncoder *encoder)
 548 {
 549         return encoder->protected->streamable_subset;
 550 }
 551
 552 bool FLAC__stream_encoder_do_mid_side_stereo(const FLAC__StreamEncoder *encoder)
 553 {
 554         return encoder->protected->do_mid_side_stereo;
 555 }
 556
 557 bool FLAC__stream_encoder_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder)
 558 {
 559         return encoder->protected->loose_mid_side_stereo;
 560 }
 561
 562 unsigned FLAC__stream_encoder_channels(const FLAC__StreamEncoder *encoder)
 563 {
 564         return encoder->protected->channels;
 565 }
 566
 567 unsigned FLAC__stream_encoder_bits_per_sample(const FLAC__StreamEncoder *encoder)
 568 {
 569         return encoder->protected->bits_per_sample;
 570 }
 571
 572 unsigned FLAC__stream_encoder_sample_rate(const FLAC__StreamEncoder *encoder)
 573 {
 574         return encoder->protected->sample_rate;
 575 }
 576
 577 unsigned FLAC__stream_encoder_blocksize(const FLAC__StreamEncoder *encoder)
 578 {
 579         return encoder->protected->blocksize;
 580 }
 581
 582 unsigned FLAC__stream_encoder_max_lpc_order(const FLAC__StreamEncoder *encoder)
 583 {
 584         return encoder->protected->max_lpc_order;
 585 }
 586
 587 unsigned FLAC__stream_encoder_qlp_coeff_precision(const FLAC__StreamEncoder *encoder)
 588 {
 589         return encoder->protected->qlp_coeff_precision;
 590 }
 591
 592 bool FLAC__stream_encoder_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder)
 593 {
 594         return encoder->protected->do_qlp_coeff_prec_search;
 595 }
 596
 597 bool FLAC__stream_encoder_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder)
 598 {
 599         return encoder->protected->do_exhaustive_model_search;
 600 }
 601
 602 unsigned FLAC__stream_encoder_min_residual_partition_order(const FLAC__StreamEncoder *encoder)
 603 {
 604         return encoder->protected->min_residual_partition_order;
 605 }
 606
 607 unsigned FLAC__stream_encoder_max_residual_partition_order(const FLAC__StreamEncoder *encoder)
 608 {
 609         return encoder->protected->max_residual_partition_order;
 610 }
 611
 612 unsigned FLAC__stream_encoder_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder)
 613 {
 614         return encoder->protected->rice_parameter_search_dist;
 615 }
 616
 617 bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const int32 *buf[], unsigned samples)
 618 {
 619         unsigned i, j, channel;
 620         int32 x, mid, side;
 621         const unsigned channels = encoder->protected->channels, blocksize = encoder->protected->blocksize;
 622
 623         FLAC__ASSERT(encoder != 0);
 624         FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK);
 625
 626         j = 0;
 627         if(encoder->protected->do_mid_side_stereo && channels == 2) {
 628                 do {
 629                         for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) {
 630                                 x = mid = side = buf[0][j];
 631                                 encoder->private->integer_signal[0][i] = x;
 632                                 encoder->private->real_signal[0][i] = (real)x;
 633                                 x = buf[1][j];
 634                                 encoder->private->integer_signal[1][i] = x;
 635                                 encoder->private->real_signal[1][i] = (real)x;
 636                                 mid += x;
 637                                 side -= x;
 638                                 mid >>= 1; /* NOTE: not the same as 'mid = (buf[0][j] + buf[1][j]) / 2' ! */
 639                                 encoder->private->integer_signal_mid_side[1][i] = side;
 640                                 encoder->private->integer_signal_mid_side[0][i] = mid;
 641                                 encoder->private->real_signal_mid_side[1][i] = (real)side;
 642                                 encoder->private->real_signal_mid_side[0][i] = (real)mid;
 643                                 encoder->private->current_sample_number++;
 644                         }
 645                         if(i == blocksize) {
 646                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 647                                         return false;
 648                         }
 649                 } while(j < samples);
 650         }
 651         else {
 652                 do {
 653                         for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) {
 654                                 for(channel = 0; channel < channels; channel++) {
 655                                         x = buf[channel][j];
 656                                         encoder->private->integer_signal[channel][i] = x;
 657                                         encoder->private->real_signal[channel][i] = (real)x;
 658                                 }
 659                                 encoder->private->current_sample_number++;
 660                         }
 661                         if(i == blocksize) {
 662                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 663                                         return false;
 664                         }
 665                 } while(j < samples);
 666         }
 667
 668         return true;
 669 }
 670
 671 /* 'samples' is channel-wide samples, e.g. for 1 second at 44100Hz, 'samples' = 44100 regardless of the number of channels */
 672 bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const int32 buf[], unsigned samples)
 673 {
 674         unsigned i, j, k, channel;
 675         int32 x, mid, side;
 676         const unsigned channels = encoder->protected->channels, blocksize = encoder->protected->blocksize;
 677
 678         FLAC__ASSERT(encoder != 0);
 679         FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK);
 680
 681         j = k = 0;
 682         if(encoder->protected->do_mid_side_stereo && channels == 2) {
 683                 do {
 684                         for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) {
 685                                 x = mid = side = buf[k++];
 686                                 encoder->private->integer_signal[0][i] = x;
 687                                 encoder->private->real_signal[0][i] = (real)x;
 688                                 x = buf[k++];
 689                                 encoder->private->integer_signal[1][i] = x;
 690                                 encoder->private->real_signal[1][i] = (real)x;
 691                                 mid += x;
 692                                 side -= x;
 693                                 mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
 694                                 encoder->private->integer_signal_mid_side[1][i] = side;
 695                                 encoder->private->integer_signal_mid_side[0][i] = mid;
 696                                 encoder->private->real_signal_mid_side[1][i] = (real)side;
 697                                 encoder->private->real_signal_mid_side[0][i] = (real)mid;
 698                                 encoder->private->current_sample_number++;
 699                         }
 700                         if(i == blocksize) {
 701                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 702                                         return false;
 703                         }
 704                 } while(j < samples);
 705         }
 706         else {
 707                 do {
 708                         for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) {
 709                                 for(channel = 0; channel < channels; channel++) {
 710                                         x = buf[k++];
 711                                         encoder->private->integer_signal[channel][i] = x;
 712                                         encoder->private->real_signal[channel][i] = (real)x;
 713                                 }
 714                                 encoder->private->current_sample_number++;
 715                         }
 716                         if(i == blocksize) {
 717                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
 718                                         return false;
 719                         }
 720                 } while(j < samples);
 721         }
 722
 723         return true;
 724 }
 725
 726 bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size)
 727 {
 728         bool ok;
 729         unsigned i, channel;
 730
 731         FLAC__ASSERT(new_size > 0);
 732         FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK);
 733         FLAC__ASSERT(encoder->private->current_sample_number == 0);
 734
 735         /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */
 736         if(new_size <= encoder->private->input_capacity)
 737                 return true;
 738
 739         ok = true;
 740         for(i = 0; ok && i < encoder->protected->channels; i++) {
 741                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private->integer_signal_unaligned[i], &encoder->private->integer_signal[i]);
 742                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private->real_signal_unaligned[i], &encoder->private->real_signal[i]);
 743         }
 744         for(i = 0; ok && i < 2; i++) {
 745                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private->integer_signal_mid_side_unaligned[i], &encoder->private->integer_signal_mid_side[i]);
 746                 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]);
 747         }
 748         for(channel = 0; ok && channel < encoder->protected->channels; channel++) {
 749                 for(i = 0; ok && i < 2; i++) {
 750                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private->residual_workspace_unaligned[channel][i], &encoder->private->residual_workspace[channel][i]);
 751                 }
 752         }
 753         for(channel = 0; ok && channel < 2; channel++) {
 754                 for(i = 0; ok && i < 2; i++) {
 755                         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]);
 756                 }
 757         }
 758         ok = ok && FLAC__memory_alloc_aligned_uint32_array(new_size, &encoder->private->abs_residual_unaligned, &encoder->private->abs_residual);
 759 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
 760         ok = ok && FLAC__memory_alloc_aligned_uint32_array(new_size * 2, &encoder->private->abs_residual_partition_sums_unaligned, &encoder->private->abs_residual_partition_sums);
 761 #endif
 762 #ifdef FLAC__SEARCH_FOR_ESCAPES
 763         ok = ok && FLAC__memory_alloc_aligned_unsigned_array(new_size * 2, &encoder->private->raw_bits_per_partition_unaligned, &encoder->private->raw_bits_per_partition);
 764 #endif
 765
 766         if(ok)
 767                 encoder->private->input_capacity = new_size;
 768         else
 769                 encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 770
 771         return ok;
 772 }
 773
 774 /***********************************************************************
 775  *
 776  * Private class methods
 777  *
 778  ***********************************************************************/
 779
 780 bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, bool is_last_frame)
 781 {
 782         FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK);
 783
 784         /*
 785          * Accumulate raw signal to the MD5 signature
 786          */
 787         /* 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: */
 788         if(!FLAC__MD5Accumulate(&encoder->private->md5context, encoder->private->integer_signal, encoder->protected->channels, encoder->protected->blocksize, (encoder->protected->bits_per_sample+7) / 8)) {
 789                 encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 790                 return false;
 791         }
 792
 793         /*
 794          * Process the frame header and subframes into the frame bitbuffer
 795          */
 796         if(!stream_encoder_process_subframes_(encoder, is_last_frame)) {
 797                 /* the above function sets the state for us in case of an error */
 798                 return false;
 799         }
 800
 801         /*
 802          * Zero-pad the frame to a byte_boundary
 803          */
 804         if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(&encoder->private->frame)) {
 805                 encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 806                 return false;
 807         }
 808
 809         /*
 810          * CRC-16 the whole thing
 811          */
 812         FLAC__ASSERT(encoder->private->frame.bits == 0); /* assert that we're byte-aligned */
 813         FLAC__ASSERT(encoder->private->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */
 814         FLAC__bitbuffer_write_raw_uint32(&encoder->private->frame, FLAC__crc16(encoder->private->frame.buffer, encoder->private->frame.bytes), FLAC__FRAME_FOOTER_CRC_LEN);
 815
 816         /*
 817          * Write it
 818          */
 819         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) {
 820                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
 821                 return false;
 822         }
 823
 824         /*
 825          * Get ready for the next frame
 826          */
 827         encoder->private->current_sample_number = 0;
 828         encoder->private->current_frame_number++;
 829         encoder->private->metadata.data.stream_info.total_samples += (uint64)encoder->protected->blocksize;
 830         encoder->private->metadata.data.stream_info.min_framesize = min(encoder->private->frame.bytes, encoder->private->metadata.data.stream_info.min_framesize);
 831         encoder->private->metadata.data.stream_info.max_framesize = max(encoder->private->frame.bytes, encoder->private->metadata.data.stream_info.max_framesize);
 832
 833         return true;
 834 }
 835
 836 bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, bool is_last_frame)
 837 {
 838         FLAC__FrameHeader frame_header;
 839         unsigned channel, min_partition_order = encoder->protected->min_residual_partition_order, max_partition_order;
 840         bool do_independent, do_mid_side;
 841
 842         /*
 843          * Calculate the min,max Rice partition orders
 844          */
 845         if(is_last_frame) {
 846                 max_partition_order = 0;
 847         }
 848         else {
 849                 unsigned limit = 0, b = encoder->protected->blocksize;
 850                 while(!(b & 1)) {
 851                         limit++;
 852                         b >>= 1;
 853                 }
 854                 max_partition_order = min(encoder->protected->max_residual_partition_order, limit);
 855         }
 856         min_partition_order = min(min_partition_order, max_partition_order);
 857
 858         /*
 859          * Setup the frame
 860          */
 861         if(!FLAC__bitbuffer_clear(&encoder->private->frame)) {
 862                 encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 863                 return false;
 864         }
 865         frame_header.blocksize = encoder->protected->blocksize;
 866         frame_header.sample_rate = encoder->protected->sample_rate;
 867         frame_header.channels = encoder->protected->channels;
 868         frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
 869         frame_header.bits_per_sample = encoder->protected->bits_per_sample;
 870         frame_header.number.frame_number = encoder->private->current_frame_number;
 871
 872         /*
 873          * Figure out what channel assignments to try
 874          */
 875         if(encoder->protected->do_mid_side_stereo) {
 876                 if(encoder->protected->loose_mid_side_stereo) {
 877                         if(encoder->private->loose_mid_side_stereo_frame_count == 0) {
 878                                 do_independent = true;
 879                                 do_mid_side = true;
 880                         }
 881                         else {
 882                                 do_independent = (encoder->private->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
 883                                 do_mid_side = !do_independent;
 884                         }
 885                 }
 886                 else {
 887                         do_independent = true;
 888                         do_mid_side = true;
 889                 }
 890         }
 891         else {
 892                 do_independent = true;
 893                 do_mid_side = false;
 894         }
 895
 896         FLAC__ASSERT(do_independent || do_mid_side);
 897
 898         /*
 899          * Check for wasted bits; set effective bps for each subframe
 900          */
 901         if(do_independent) {
 902                 unsigned w;
 903                 for(channel = 0; channel < encoder->protected->channels; channel++) {
 904                         w = stream_encoder_get_wasted_bits_(encoder->private->integer_signal[channel], encoder->protected->blocksize);
 905                         encoder->private->subframe_workspace[channel][0].wasted_bits = encoder->private->subframe_workspace[channel][1].wasted_bits = w;
 906                         encoder->private->subframe_bps[channel] = encoder->protected->bits_per_sample - w;
 907                 }
 908         }
 909         if(do_mid_side) {
 910                 unsigned w;
 911                 FLAC__ASSERT(encoder->protected->channels == 2);
 912                 for(channel = 0; channel < 2; channel++) {
 913                         w = stream_encoder_get_wasted_bits_(encoder->private->integer_signal_mid_side[channel], encoder->protected->blocksize);
 914                         encoder->private->subframe_workspace_mid_side[channel][0].wasted_bits = encoder->private->subframe_workspace_mid_side[channel][1].wasted_bits = w;
 915                         encoder->private->subframe_bps_mid_side[channel] = encoder->protected->bits_per_sample - w + (channel==0? 0:1);
 916                 }
 917         }
 918
 919         /*
 920          * First do a normal encoding pass of each independent channel
 921          */
 922         if(do_independent) {
 923                 for(channel = 0; channel < encoder->protected->channels; channel++) {
 924                         if(!stream_encoder_process_subframe_(encoder, min_partition_order, max_partition_order, 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))
 925                                 return false;
 926                 }
 927         }
 928
 929         /*
 930          * Now do mid and side channels if requested
 931          */
 932         if(do_mid_side) {
 933                 FLAC__ASSERT(encoder->protected->channels == 2);
 934
 935                 for(channel = 0; channel < 2; channel++) {
 936                         if(!stream_encoder_process_subframe_(encoder, min_partition_order, max_partition_order, 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))
 937                                 return false;
 938                 }
 939         }
 940
 941         /*
 942          * Compose the frame bitbuffer
 943          */
 944         if(do_mid_side) {
 945                 unsigned left_bps = 0, right_bps = 0; /* initialized only to prevent superfluous compiler warning */
 946                 FLAC__Subframe *left_subframe = 0, *right_subframe = 0; /* initialized only to prevent superfluous compiler warning */
 947                 FLAC__ChannelAssignment channel_assignment;
 948
 949                 FLAC__ASSERT(encoder->protected->channels == 2);
 950
 951                 if(encoder->protected->loose_mid_side_stereo && encoder->private->loose_mid_side_stereo_frame_count > 0) {
 952                         channel_assignment = (encoder->private->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE);
 953                 }
 954                 else {
 955                         unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
 956                         unsigned min_bits;
 957                         FLAC__ChannelAssignment ca;
 958
 959                         FLAC__ASSERT(do_independent && do_mid_side);
 960
 961                         /* We have to figure out which channel assignent results in the smallest frame */
 962                         bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->private->best_subframe_bits         [0] + encoder->private->best_subframe_bits         [1];
 963                         bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE  ] = encoder->private->best_subframe_bits         [0] + encoder->private->best_subframe_bits_mid_side[1];
 964                         bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->private->best_subframe_bits         [1] + encoder->private->best_subframe_bits_mid_side[1];
 965                         bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE   ] = encoder->private->best_subframe_bits_mid_side[0] + encoder->private->best_subframe_bits_mid_side[1];
 966
 967                         for(channel_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) {
 968                                 if(bits[ca] < min_bits) {
 969                                         min_bits = bits[ca];
 970                                         channel_assignment = ca;
 971                                 }
 972                         }
 973                 }
 974
 975                 frame_header.channel_assignment = channel_assignment;
 976
 977                 if(!FLAC__frame_add_header(&frame_header, encoder->protected->streamable_subset, is_last_frame, &encoder->private->frame)) {
 978                         encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
 979                         return false;
 980                 }
 981
 982                 switch(channel_assignment) {
 983                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 984                                 left_subframe  = &encoder->private->subframe_workspace         [0][encoder->private->best_subframe         [0]];
 985                                 right_subframe = &encoder->private->subframe_workspace         [1][encoder->private->best_subframe         [1]];
 986                                 break;
 987                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 988                                 left_subframe  = &encoder->private->subframe_workspace         [0][encoder->private->best_subframe         [0]];
 989                                 right_subframe = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]];
 990                                 break;
 991                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 992                                 left_subframe  = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]];
 993                                 right_subframe = &encoder->private->subframe_workspace         [1][encoder->private->best_subframe         [1]];
 994                                 break;
 995                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 996                                 left_subframe  = &encoder->private->subframe_workspace_mid_side[0][encoder->private->best_subframe_mid_side[0]];
 997                                 right_subframe = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]];
 998                                 break;
 999                         default:
1000                                 FLAC__ASSERT(0);
1001                 }
1002
1003                 switch(channel_assignment) {
1004                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1005                                 left_bps  = encoder->private->subframe_bps         [0];
1006                                 right_bps = encoder->private->subframe_bps         [1];
1007                                 break;
1008                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1009                                 left_bps  = encoder->private->subframe_bps         [0];
1010                                 right_bps = encoder->private->subframe_bps_mid_side[1];
1011                                 break;
1012                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1013                                 left_bps  = encoder->private->subframe_bps_mid_side[1];
1014                                 right_bps = encoder->private->subframe_bps         [1];
1015                                 break;
1016                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1017                                 left_bps  = encoder->private->subframe_bps_mid_side[0];
1018                                 right_bps = encoder->private->subframe_bps_mid_side[1];
1019                                 break;
1020                         default:
1021                                 FLAC__ASSERT(0);
1022                 }
1023
1024                 /* note that encoder_add_subframe_ sets the state for us in case of an error */
1025                 if(!stream_encoder_add_subframe_(encoder, &frame_header, left_bps , left_subframe , &encoder->private->frame))
1026                         return false;
1027                 if(!stream_encoder_add_subframe_(encoder, &frame_header, right_bps, right_subframe, &encoder->private->frame))
1028                         return false;
1029         }
1030         else {
1031                 if(!FLAC__frame_add_header(&frame_header, encoder->protected->streamable_subset, is_last_frame, &encoder->private->frame)) {
1032                         encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1033                         return false;
1034                 }
1035
1036                 for(channel = 0; channel < encoder->protected->channels; channel++) {
1037                         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)) {
1038                                 /* the above function sets the state for us in case of an error */
1039                                 return false;
1040                         }
1041                 }
1042         }
1043
1044         if(encoder->protected->loose_mid_side_stereo) {
1045                 encoder->private->loose_mid_side_stereo_frame_count++;
1046                 if(encoder->private->loose_mid_side_stereo_frame_count >= encoder->private->loose_mid_side_stereo_frames)
1047                         encoder->private->loose_mid_side_stereo_frame_count = 0;
1048         }
1049
1050         encoder->private->last_channel_assignment = frame_header.channel_assignment;
1051
1052         return true;
1053 }
1054
1055 bool stream_encoder_process_subframe_(FLAC__StreamEncoder *encoder, unsigned min_partition_order, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits)
1056 {
1057         real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
1058         real lpc_residual_bits_per_sample;
1059         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 */
1060         real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER];
1061         real lpc_error[FLAC__MAX_LPC_ORDER];
1062         unsigned min_lpc_order, max_lpc_order, lpc_order;
1063         unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
1064         unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
1065         unsigned rice_parameter;
1066         unsigned _candidate_bits, _best_bits;
1067         unsigned _best_subframe;
1068
1069         /* verbatim subframe is the baseline against which we measure other compressed subframes */
1070         _best_subframe = 0;
1071         _best_bits = stream_encoder_evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
1072
1073         if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
1074                 /* check for constant subframe */
1075                 if(encoder->private->use_slow)
1076                         guess_fixed_order = FLAC__fixed_compute_best_predictor_slow(integer_signal+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample);
1077                 else
1078                         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);
1079                 if(fixed_residual_bits_per_sample[1] == 0.0) {
1080                         /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
1081                         unsigned i, signal_is_constant = true;
1082                         for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
1083                                 if(integer_signal[0] != integer_signal[i]) {
1084                                         signal_is_constant = false;
1085                                         break;
1086                                 }
1087                         }
1088                         if(signal_is_constant) {
1089                                 _candidate_bits = stream_encoder_evaluate_constant_subframe_(integer_signal[0], subframe_bps, subframe[!_best_subframe]);
1090                                 if(_candidate_bits < _best_bits) {
1091                                         _best_subframe = !_best_subframe;
1092                                         _best_bits = _candidate_bits;
1093                                 }
1094                         }
1095                 }
1096                 else {
1097                         /* encode fixed */
1098                         if(encoder->protected->do_exhaustive_model_search) {
1099                                 min_fixed_order = 0;
1100                                 max_fixed_order = FLAC__MAX_FIXED_ORDER;
1101                         }
1102                         else {
1103                                 min_fixed_order = max_fixed_order = guess_fixed_order;
1104                         }
1105                         for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
1106                                 if(fixed_residual_bits_per_sample[fixed_order] >= (real)subframe_bps)
1107                                         continue; /* don't even try */
1108                                 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 */
1109 #ifndef FLAC__SYMMETRIC_RICE
1110                                 rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1111 #endif
1112                                 if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER)
1113                                         rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1114                                 _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, encoder->protected->rice_parameter_search_dist, subframe[!_best_subframe]);
1115                                 if(_candidate_bits < _best_bits) {
1116                                         _best_subframe = !_best_subframe;
1117                                         _best_bits = _candidate_bits;
1118                                 }
1119                         }
1120
1121                         /* encode lpc */
1122                         if(encoder->protected->max_lpc_order > 0) {
1123                                 if(encoder->protected->max_lpc_order >= frame_header->blocksize)
1124                                         max_lpc_order = frame_header->blocksize-1;
1125                                 else
1126                                         max_lpc_order = encoder->protected->max_lpc_order;
1127                                 if(max_lpc_order > 0) {
1128                                         encoder->private->local_lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc);
1129                                         /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */
1130                                         if(autoc[0] != 0.0) {
1131                                                 FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, lp_coeff, lpc_error);
1132                                                 if(encoder->protected->do_exhaustive_model_search) {
1133                                                         min_lpc_order = 1;
1134                                                 }
1135                                                 else {
1136                                                         unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, subframe_bps);
1137                                                         min_lpc_order = max_lpc_order = guess_lpc_order;
1138                                                 }
1139                                                 if(encoder->protected->do_qlp_coeff_prec_search) {
1140                                                         min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
1141                                                         max_qlp_coeff_precision = min(32 - subframe_bps - 1, (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)-1);
1142                                                 }
1143                                                 else {
1144                                                         min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->protected->qlp_coeff_precision;
1145                                                 }
1146                                                 for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
1147                                                         lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order);
1148                                                         if(lpc_residual_bits_per_sample >= (real)subframe_bps)
1149                                                                 continue; /* don't even try */
1150                                                         rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */
1151 #ifndef FLAC__SYMMETRIC_RICE
1152                                                         rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1153 #endif
1154                                                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER)
1155                                                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1156                                                         for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
1157                                                                 _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, encoder->protected->rice_parameter_search_dist, subframe[!_best_subframe]);
1158                                                                 if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
1159                                                                         if(_candidate_bits < _best_bits) {
1160                                                                                 _best_subframe = !_best_subframe;
1161                                                                                 _best_bits = _candidate_bits;
1162                                                                         }
1163                                                                 }
1164                                                         }
1165                                                 }
1166                                         }
1167                                 }
1168                         }
1169                 }
1170         }
1171
1172         *best_subframe = _best_subframe;
1173         *best_bits = _best_bits;
1174
1175         return true;
1176 }
1177
1178 bool stream_encoder_add_subframe_(FLAC__StreamEncoder *encoder, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame)
1179 {
1180         switch(subframe->type) {
1181                 case FLAC__SUBFRAME_TYPE_CONSTANT:
1182                         if(!FLAC__subframe_add_constant(&(subframe->data.constant), subframe_bps, subframe->wasted_bits, frame)) {
1183                                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1184                                 return false;
1185                         }
1186                         break;
1187                 case FLAC__SUBFRAME_TYPE_FIXED:
1188                         if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, subframe_bps, subframe->wasted_bits, frame)) {
1189                                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1190                                 return false;
1191                         }
1192                         break;
1193                 case FLAC__SUBFRAME_TYPE_LPC:
1194                         if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, subframe_bps, subframe->wasted_bits, frame)) {
1195                                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1196                                 return false;
1197                         }
1198                         break;
1199                 case FLAC__SUBFRAME_TYPE_VERBATIM:
1200                         if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, subframe_bps, subframe->wasted_bits, frame)) {
1201                                 encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1202                                 return false;
1203                         }
1204                         break;
1205                 default:
1206                         FLAC__ASSERT(0);
1207         }
1208
1209         return true;
1210 }
1211
1212 unsigned stream_encoder_evaluate_constant_subframe_(const int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe)
1213 {
1214         subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT;
1215         subframe->data.constant.value = signal;
1216
1217         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe_bps;
1218 }
1219
1220 unsigned stream_encoder_evaluate_fixed_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], uint32 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, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe)
1221 {
1222         unsigned i, residual_bits;
1223         const unsigned residual_samples = blocksize - order;
1224
1225         FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual);
1226
1227         subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
1228
1229         subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
1230         subframe->data.fixed.residual = residual;
1231
1232         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, 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);
1233
1234         subframe->data.fixed.order = order;
1235         for(i = 0; i < order; i++)
1236                 subframe->data.fixed.warmup[i] = signal[i];
1237
1238         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (order * subframe_bps) + residual_bits;
1239 }
1240
1241 unsigned stream_encoder_evaluate_lpc_subframe_(FLAC__StreamEncoder *encoder, const int32 signal[], int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], const 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, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe)
1242 {
1243         int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
1244         unsigned i, residual_bits;
1245         int quantization, ret;
1246         const unsigned residual_samples = blocksize - order;
1247
1248         ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, subframe_bps, qlp_coeff, &quantization);
1249         if(ret != 0)
1250                 return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */
1251
1252         if(subframe_bps <= 16 && qlp_coeff_precision <= 16)
1253                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
1254         else
1255                 encoder->private->local_lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
1256
1257         subframe->type = FLAC__SUBFRAME_TYPE_LPC;
1258
1259         subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
1260         subframe->data.lpc.residual = residual;
1261
1262         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, 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);
1263
1264         subframe->data.lpc.order = order;
1265         subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision;
1266         subframe->data.lpc.quantization_level = quantization;
1267         memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(int32)*FLAC__MAX_LPC_ORDER);
1268         for(i = 0; i < order; i++)
1269                 subframe->data.lpc.warmup[i] = signal[i];
1270
1271         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;
1272 }
1273
1274 unsigned stream_encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe)
1275 {
1276         subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
1277
1278         subframe->data.verbatim.data = signal;
1279
1280         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (blocksize * subframe_bps);
1281 }
1282
1283 unsigned stream_encoder_find_best_partition_order_(const int32 residual[], uint32 abs_residual[], uint32 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, unsigned rice_parameter_search_dist, unsigned *best_partition_order, unsigned best_parameters[], unsigned best_raw_bits[])
1284 {
1285         int32 r;
1286 #if (defined FLAC__PRECOMPUTE_PARTITION_SUMS) || (defined FLAC__SEARCH_FOR_ESCAPES)
1287         unsigned sum;
1288         int partition_order;
1289 #else
1290         unsigned partition_order;
1291 #endif
1292         unsigned residual_bits, best_residual_bits = 0;
1293         unsigned residual_sample;
1294         unsigned best_parameters_index = 0, parameters[2][1 << FLAC__MAX_RICE_PARTITION_ORDER], raw_bits[2][1 << FLAC__MAX_RICE_PARTITION_ORDER];
1295
1296         /* compute abs(residual) for use later */
1297         for(residual_sample = 0; residual_sample < residual_samples; residual_sample++) {
1298                 r = residual[residual_sample];
1299                 abs_residual[residual_sample] = (uint32)(r<0? -r : r);
1300         }
1301
1302 #if (defined FLAC__PRECOMPUTE_PARTITION_SUMS) || (defined FLAC__SEARCH_FOR_ESCAPES)
1303         max_partition_order = stream_encoder_precompute_partition_info_(residual, abs_residual, abs_residual_partition_sums, raw_bits_per_partition, residual_samples, predictor_order, min_partition_order, max_partition_order);
1304         min_partition_order = min(min_partition_order, max_partition_order);
1305
1306         for(partition_order = (int)max_partition_order, sum = 0; partition_order >= (int)min_partition_order; partition_order--) {
1307                 if(!stream_encoder_set_partitioned_rice_(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, parameters[!best_parameters_index], raw_bits[!best_parameters_index], &residual_bits)) {
1308                         FLAC__ASSERT(0); /* stream_encoder_precompute_partition_info_ should keep this from ever happening */
1309                 }
1310                 sum += 1u << partition_order;
1311                 if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1312                         best_residual_bits = residual_bits;
1313                         *best_partition_order = partition_order;
1314                         best_parameters_index = !best_parameters_index;
1315                 }
1316         }
1317 #else
1318         for(partition_order = min_partition_order; partition_order <= max_partition_order; partition_order++) {
1319                 if(!stream_encoder_set_partitioned_rice_(abs_residual, 0, 0, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, partition_order, parameters[!best_parameters_index], raw_bits[!best_parameters_index], &residual_bits)) {
1320                         FLAC__ASSERT(best_residual_bits != 0);
1321                         break;
1322                 }
1323                 if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1324                         best_residual_bits = residual_bits;
1325                         *best_partition_order = partition_order;
1326                         best_parameters_index = !best_parameters_index;
1327                 }
1328         }
1329 #endif
1330         memcpy(best_parameters, parameters[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1331         memcpy(best_raw_bits, raw_bits[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1332
1333         return best_residual_bits;
1334 }
1335
1336 #if (defined FLAC__PRECOMPUTE_PARTITION_SUMS) || (defined FLAC__SEARCH_FOR_ESCAPES)
1337 unsigned stream_encoder_precompute_partition_info_(const int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order)
1338 {
1339         int partition_order;
1340         unsigned from_partition, to_partition = 0;
1341         const unsigned blocksize = residual_samples + predictor_order;
1342
1343         /* first do max_partition_order */
1344         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
1345 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
1346                 uint32 abs_residual_partition_sum;
1347 #endif
1348 #ifdef FLAC__SEARCH_FOR_ESCAPES
1349                 uint32 abs_residual_partition_max;
1350                 unsigned abs_residual_partition_max_index = 0; /* initialized to silence superfluous compiler warning */
1351 #endif
1352                 uint32 abs_r;
1353                 unsigned partition, partition_sample, partition_samples, residual_sample;
1354                 const unsigned partitions = 1u << partition_order;
1355                 const unsigned default_partition_samples = blocksize >> partition_order;
1356
1357                 if(default_partition_samples <= predictor_order) {
1358                         FLAC__ASSERT(max_partition_order > 0);
1359                         max_partition_order--;
1360                 }
1361                 else {
1362                         for(partition = residual_sample = 0; partition < partitions; partition++) {
1363                                 partition_samples = default_partition_samples;
1364                                 if(partition == 0)
1365                                         partition_samples -= predictor_order;
1366 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
1367                                 abs_residual_partition_sum = 0;
1368 #endif
1369 #ifdef FLAC__SEARCH_FOR_ESCAPES
1370                                 abs_residual_partition_max = 0;
1371 #endif
1372                                 for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
1373                                         abs_r = abs_residual[residual_sample];
1374 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
1375                                         abs_residual_partition_sum += abs_r; /* @@@ this can overflow with small max_partition_order and (large blocksizes or bits-per-sample), FIX! */
1376 #endif
1377 #ifdef FLAC__SEARCH_FOR_ESCAPES
1378                                         if(abs_r > abs_residual_partition_max) {
1379                                                 abs_residual_partition_max = abs_r;
1380                                                 abs_residual_partition_max_index = residual_sample;
1381                                         }
1382 #endif
1383                                         residual_sample++;
1384                                 }
1385 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
1386                                 abs_residual_partition_sums[partition] = abs_residual_partition_sum;
1387 #endif
1388 #ifdef FLAC__SEARCH_FOR_ESCAPES
1389                                 if(abs_residual_partition_max > 0)
1390                                         raw_bits_per_partition[partition] = FLAC__bitmath_silog2(residual[abs_residual_partition_max_index]);
1391                                 else
1392                                         raw_bits_per_partition[partition] = FLAC__bitmath_silog2(0);
1393 #endif
1394                         }
1395                         to_partition = partitions;
1396                         break;
1397                 }
1398         }
1399
1400         /* now merge for lower orders */
1401         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
1402 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
1403                 uint32 s;
1404 #endif
1405 #ifdef FLAC__SEARCH_FOR_ESCAPES
1406                 unsigned m;
1407 #endif
1408                 unsigned i;
1409                 const unsigned partitions = 1u << partition_order;
1410                 for(i = 0; i < partitions; i++) {
1411 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
1412                         s = abs_residual_partition_sums[from_partition];
1413 #endif
1414 #ifdef FLAC__SEARCH_FOR_ESCAPES
1415                         m = raw_bits_per_partition[from_partition];
1416 #endif
1417                         from_partition++;
1418 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
1419                         abs_residual_partition_sums[to_partition] = s + abs_residual_partition_sums[from_partition];
1420 #endif
1421 #ifdef FLAC__SEARCH_FOR_ESCAPES
1422                         raw_bits_per_partition[to_partition] = max(m, raw_bits_per_partition[from_partition]);
1423 #endif
1424                         from_partition++;
1425                         to_partition++;
1426                 }
1427         }
1428
1429         return max_partition_order;
1430 }
1431 #endif
1432
1433 #ifdef VARIABLE_RICE_BITS
1434 #undef VARIABLE_RICE_BITS
1435 #endif
1436 #define VARIABLE_RICE_BITS(value, parameter) ((value) >> (parameter))
1437
1438 bool stream_encoder_set_partitioned_rice_(const uint32 abs_residual[], const uint32 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, unsigned parameters[], unsigned raw_bits[], unsigned *bits)
1439 {
1440         unsigned rice_parameter, partition_bits;
1441 #ifndef NO_RICE_SEARCH
1442         unsigned best_partition_bits;
1443         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
1444 #endif
1445 #ifdef FLAC__SEARCH_FOR_ESCAPES
1446         unsigned flat_bits;
1447 #endif
1448         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
1449
1450         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
1451
1452         if(partition_order == 0) {
1453                 unsigned i;
1454
1455 #ifndef NO_RICE_SEARCH
1456                 if(rice_parameter_search_dist) {
1457                         if(suggested_rice_parameter < rice_parameter_search_dist)
1458                                 min_rice_parameter = 0;
1459                         else
1460                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
1461                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
1462                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER)
1463                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1464                 }
1465                 else
1466                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
1467
1468                 best_partition_bits = 0xffffffff;
1469                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1470 #endif
1471 #ifdef VARIABLE_RICE_BITS
1472 #ifdef FLAC__SYMMETRIC_RICE
1473                         partition_bits = (2+rice_parameter) * residual_samples;
1474 #else
1475                         const unsigned rice_parameter_estimate = rice_parameter-1;
1476                         partition_bits = (1+rice_parameter) * residual_samples;
1477 #endif
1478 #else
1479                         partition_bits = 0;
1480 #endif
1481                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1482                         for(i = 0; i < residual_samples; i++) {
1483 #ifdef VARIABLE_RICE_BITS
1484 #ifdef FLAC__SYMMETRIC_RICE
1485                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
1486 #else
1487                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
1488 #endif
1489 #else
1490                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
1491 #endif
1492                         }
1493 #ifndef NO_RICE_SEARCH
1494                         if(partition_bits < best_partition_bits) {
1495                                 best_rice_parameter = rice_parameter;
1496                                 best_partition_bits = partition_bits;
1497                         }
1498                 }
1499 #endif
1500 #ifdef FLAC__SEARCH_FOR_ESCAPES
1501                 flat_bits = raw_bits_per_partition[0] * residual_samples;
1502                 if(flat_bits <= best_partition_bits) {
1503                         raw_bits[0] = raw_bits_per_partition[0];
1504                         best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
1505                         best_partition_bits = flat_bits;
1506                 }
1507 #endif
1508                 parameters[0] = best_rice_parameter;
1509                 bits_ += best_partition_bits;
1510         }
1511         else {
1512                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
1513                 unsigned mean, partition_samples;
1514                 const unsigned partitions = 1u << partition_order;
1515                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1516                         partition_samples = (residual_samples+predictor_order) >> partition_order;
1517                         if(partition == 0) {
1518                                 if(partition_samples <= predictor_order)
1519                                         return false;
1520                                 else
1521                                         partition_samples -= predictor_order;
1522                         }
1523                         mean = partition_samples >> 1;
1524 #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS
1525                         mean += abs_residual_partition_sums[partition];
1526 #else
1527                         save_residual_sample = residual_sample;
1528                         for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++)
1529                                 mean += abs_residual[residual_sample];
1530                         residual_sample = save_residual_sample;
1531 #endif
1532                         mean /= partition_samples;
1533 #ifdef FLAC__SYMMETRIC_RICE
1534                         /* calc rice_parameter = floor(log2(mean)) */
1535                         rice_parameter = 0;
1536                         mean>>=1;
1537                         while(mean) {
1538                                 rice_parameter++;
1539                                 mean >>= 1;
1540                         }
1541 #else
1542                         /* calc rice_parameter = floor(log2(mean)) + 1 */
1543                         rice_parameter = 0;
1544                         while(mean) {
1545                                 rice_parameter++;
1546                                 mean >>= 1;
1547                         }
1548 #endif
1549                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER)
1550                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1551
1552 #ifndef NO_RICE_SEARCH
1553                         if(rice_parameter_search_dist) {
1554                                 if(rice_parameter < rice_parameter_search_dist)
1555                                         min_rice_parameter = 0;
1556                                 else
1557                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
1558                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
1559                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER)
1560                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1561                         }
1562                         else
1563                                 min_rice_parameter = max_rice_parameter = rice_parameter;
1564
1565                         best_partition_bits = 0xffffffff;
1566                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1567 #endif
1568 #ifdef VARIABLE_RICE_BITS
1569 #ifdef FLAC__SYMMETRIC_RICE
1570                                 partition_bits = (2+rice_parameter) * partition_samples;
1571 #else
1572                                 const unsigned rice_parameter_estimate = rice_parameter-1;
1573                                 partition_bits = (1+rice_parameter) * partition_samples;
1574 #endif
1575 #else
1576                                 partition_bits = 0;
1577 #endif
1578                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1579                                 save_residual_sample = residual_sample;
1580                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
1581 #ifdef VARIABLE_RICE_BITS
1582 #ifdef FLAC__SYMMETRIC_RICE
1583                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
1584 #else
1585                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
1586 #endif
1587 #else
1588                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
1589 #endif
1590                                 }
1591 #ifndef NO_RICE_SEARCH
1592                                 if(rice_parameter != max_rice_parameter)
1593                                         residual_sample = save_residual_sample;
1594                                 if(partition_bits < best_partition_bits) {
1595                                         best_rice_parameter = rice_parameter;
1596                                         best_partition_bits = partition_bits;
1597                                 }
1598                         }
1599 #endif
1600 #ifdef FLAC__SEARCH_FOR_ESCAPES
1601                         flat_bits = raw_bits_per_partition[partition] * partition_samples;
1602                         if(flat_bits <= best_partition_bits) {
1603                                 raw_bits[partition] = raw_bits_per_partition[partition];
1604                                 best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
1605                                 best_partition_bits = flat_bits;
1606                         }
1607 #endif
1608                         parameters[partition] = best_rice_parameter;
1609                         bits_ += best_partition_bits;
1610                 }
1611         }
1612
1613         *bits = bits_;
1614         return true;
1615 }
1616
1617 unsigned stream_encoder_get_wasted_bits_(int32 signal[], unsigned samples)
1618 {
1619         unsigned i, shift;
1620         int32 x = 0;
1621
1622         for(i = 0; i < samples && !(x&1); i++)
1623                 x |= signal[i];
1624
1625         if(x == 0) {
1626                 shift = 0;
1627         }
1628         else {
1629                 for(shift = 0; !(x&1); shift++)
1630                         x >>= 1;
1631         }
1632
1633         if(shift > 0) {
1634                 for(i = 0; i < samples; i++)
1635                          signal[i] >>= shift;
1636         }
1637
1638         return shift;
1639 }
1640