src/libFLAC/stream_encoder_framing.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 "private/stream_encoder_framing.h"
  22 #include "private/crc.h"
  23 #include "FLAC/assert.h"
  24
  25 #ifdef max
  26 #undef max
  27 #endif
  28 #define max(x,y) ((x)>(y)?(x):(y))
  29
  30 static FLAC__bool subframe_add_entropy_coding_method_(FLAC__BitBuffer *bb, const FLAC__EntropyCodingMethod *method);
  31 static FLAC__bool subframe_add_residual_partitioned_rice_(FLAC__BitBuffer *bb, const FLAC__int32 residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned rice_parameters[], const unsigned raw_bits[], const unsigned partition_order);
  32
  33 FLAC__bool FLAC__add_metadata_block(const FLAC__StreamMetaData *metadata, FLAC__BitBuffer *bb)
  34 {
  35         unsigned i;
  36
  37         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->is_last, FLAC__STREAM_METADATA_IS_LAST_LEN))
  38                 return false;
  39
  40         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->type, FLAC__STREAM_METADATA_TYPE_LEN))
  41                 return false;
  42
  43         FLAC__ASSERT(metadata->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
  44         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->length, FLAC__STREAM_METADATA_LENGTH_LEN))
  45                 return false;
  46
  47         switch(metadata->type) {
  48                 case FLAC__METADATA_TYPE_STREAMINFO:
  49                         FLAC__ASSERT(metadata->data.stream_info.min_blocksize < (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN));
  50                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.min_blocksize, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN))
  51                                 return false;
  52                         FLAC__ASSERT(metadata->data.stream_info.max_blocksize < (1u << FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN));
  53                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.max_blocksize, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
  54                                 return false;
  55                         FLAC__ASSERT(metadata->data.stream_info.min_framesize < (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN));
  56                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.min_framesize, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
  57                                 return false;
  58                         FLAC__ASSERT(metadata->data.stream_info.max_framesize < (1u << FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN));
  59                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.max_framesize, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
  60                                 return false;
  61                         FLAC__ASSERT(metadata->data.stream_info.sample_rate > 0);
  62                         FLAC__ASSERT(metadata->data.stream_info.sample_rate < (1u << FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN));
  63                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.sample_rate, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
  64                                 return false;
  65                         FLAC__ASSERT(metadata->data.stream_info.channels > 0);
  66                         FLAC__ASSERT(metadata->data.stream_info.channels <= (1u << FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN));
  67                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.channels-1, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
  68                                 return false;
  69                         FLAC__ASSERT(metadata->data.stream_info.bits_per_sample > 0);
  70                         FLAC__ASSERT(metadata->data.stream_info.bits_per_sample <= (1u << FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN));
  71                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.bits_per_sample-1, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
  72                                 return false;
  73                         if(!FLAC__bitbuffer_write_raw_uint64(bb, metadata->data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN))
  74                                 return false;
  75                         for(i = 0; i < 16; i++) {
  76                                 if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.md5sum[i], 8))
  77                                         return false;
  78                         }
  79                         break;
  80                 case FLAC__METADATA_TYPE_PADDING:
  81                         if(!FLAC__bitbuffer_write_zeroes(bb, metadata->length * 8))
  82                                 return false;
  83                         break;
  84                 case FLAC__METADATA_TYPE_APPLICATION:
  85                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.application.id[0], 8))
  86                                 return false;
  87                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.application.id[1], 8))
  88                                 return false;
  89                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.application.id[2], 8))
  90                                 return false;
  91                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.application.id[3], 8))
  92                                 return false;
  93                         for(i = 0; i < metadata->length; i++) {
  94                                 if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.application.data[i], 8))
  95                                         return false;
  96                         }
  97                         break;
  98                 case FLAC__METADATA_TYPE_SEEKTABLE:
  99                         for(i = 0; i < metadata->data.seek_table.num_points; i++) {
 100                                 if(!FLAC__bitbuffer_write_raw_uint64(bb, metadata->data.seek_table.points[i].sample_number, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
 101                                         return false;
 102                                 if(!FLAC__bitbuffer_write_raw_uint64(bb, metadata->data.seek_table.points[i].stream_offset, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
 103                                         return false;
 104                                 if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.seek_table.points[i].frame_samples, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
 105                                         return false;
 106                         }
 107                         break;
 108                 default:
 109                         FLAC__ASSERT(0);
 110         }
 111
 112         return true;
 113 }
 114
 115 FLAC__bool FLAC__frame_add_header(const FLAC__FrameHeader *header, FLAC__bool streamable_subset, FLAC__bool is_last_block, FLAC__BitBuffer *bb)
 116 {
 117         unsigned u, crc8_start, blocksize_hint, sample_rate_hint;
 118         FLAC__byte crc8;
 119
 120         FLAC__ASSERT(bb->bits == 0); /* assert that we're byte-aligned before writing */
 121
 122         crc8_start = bb->bytes;
 123
 124         if(!FLAC__bitbuffer_write_raw_uint32(bb, FLAC__FRAME_HEADER_SYNC, FLAC__FRAME_HEADER_SYNC_LEN))
 125                 return false;
 126
 127         if(!FLAC__bitbuffer_write_raw_uint32(bb, 0, FLAC__FRAME_HEADER_RESERVED_LEN))
 128                 return false;
 129
 130         FLAC__ASSERT(header->blocksize > 0 && header->blocksize <= FLAC__MAX_BLOCK_SIZE);
 131         blocksize_hint = 0;
 132         switch(header->blocksize) {
 133                 case   192: u = 1; break;
 134                 case   576: u = 2; break;
 135                 case  1152: u = 3; break;
 136                 case  2304: u = 4; break;
 137                 case  4608: u = 5; break;
 138                 case   256: u = 8; break;
 139                 case   512: u = 9; break;
 140                 case  1024: u = 10; break;
 141                 case  2048: u = 11; break;
 142                 case  4096: u = 12; break;
 143                 case  8192: u = 13; break;
 144                 case 16384: u = 14; break;
 145                 case 32768: u = 15; break;
 146                 default:
 147                         if(streamable_subset || is_last_block) {
 148                                 if(header->blocksize <= 0x100)
 149                                         blocksize_hint = u = 6;
 150                                 else
 151                                         blocksize_hint = u = 7;
 152                         }
 153                         else
 154                                 u = 0;
 155                         break;
 156         }
 157         if(!FLAC__bitbuffer_write_raw_uint32(bb, u, FLAC__FRAME_HEADER_BLOCK_SIZE_LEN))
 158                 return false;
 159
 160         FLAC__ASSERT(header->sample_rate > 0 && header->sample_rate < (1u << FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN));
 161         sample_rate_hint = 0;
 162         switch(header->sample_rate) {
 163                 case  8000: u = 4; break;
 164                 case 16000: u = 5; break;
 165                 case 22050: u = 6; break;
 166                 case 24000: u = 7; break;
 167                 case 32000: u = 8; break;
 168                 case 44100: u = 9; break;
 169                 case 48000: u = 10; break;
 170                 case 96000: u = 11; break;
 171                 default:
 172                         if(streamable_subset) {
 173                                 if(header->sample_rate % 1000 == 0)
 174                                         sample_rate_hint = u = 12;
 175                                 else if(header->sample_rate % 10 == 0)
 176                                         sample_rate_hint = u = 14;
 177                                 else
 178                                         sample_rate_hint = u = 13;
 179                         }
 180                         else
 181                                 u = 0;
 182                         break;
 183         }
 184         if(!FLAC__bitbuffer_write_raw_uint32(bb, u, FLAC__FRAME_HEADER_SAMPLE_RATE_LEN))
 185                 return false;
 186
 187         FLAC__ASSERT(header->channels > 0 && header->channels <= (1u << FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN) && header->channels <= FLAC__MAX_CHANNELS);
 188         switch(header->channel_assignment) {
 189                 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 190                         u = header->channels - 1;
 191                         break;
 192                 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 193                         FLAC__ASSERT(header->channels == 2);
 194                         u = 8;
 195                         break;
 196                 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 197                         FLAC__ASSERT(header->channels == 2);
 198                         u = 9;
 199                         break;
 200                 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 201                         FLAC__ASSERT(header->channels == 2);
 202                         u = 10;
 203                         break;
 204                 default:
 205                         FLAC__ASSERT(0);
 206         }
 207         if(!FLAC__bitbuffer_write_raw_uint32(bb, u, FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN))
 208                 return false;
 209
 210         FLAC__ASSERT(header->bits_per_sample > 0 && header->bits_per_sample <= (1u << FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN));
 211         switch(header->bits_per_sample) {
 212                 case 8 : u = 1; break;
 213                 case 12: u = 2; break;
 214                 case 16: u = 4; break;
 215                 case 20: u = 5; break;
 216                 case 24: u = 6; break;
 217                 default: u = 0; break;
 218         }
 219         if(!FLAC__bitbuffer_write_raw_uint32(bb, u, FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN))
 220                 return false;
 221
 222         if(!FLAC__bitbuffer_write_raw_uint32(bb, 0, FLAC__FRAME_HEADER_ZERO_PAD_LEN))
 223                 return false;
 224
 225         FLAC__ASSERT(header->number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER);
 226         if(!FLAC__bitbuffer_write_utf8_uint32(bb, header->number.frame_number))
 227                 return false;
 228
 229         if(blocksize_hint)
 230                 if(!FLAC__bitbuffer_write_raw_uint32(bb, header->blocksize-1, (blocksize_hint==6)? 8:16))
 231                         return false;
 232
 233         switch(sample_rate_hint) {
 234                 case 12:
 235                         if(!FLAC__bitbuffer_write_raw_uint32(bb, header->sample_rate / 1000, 8))
 236                                 return false;
 237                         break;
 238                 case 13:
 239                         if(!FLAC__bitbuffer_write_raw_uint32(bb, header->sample_rate, 16))
 240                                 return false;
 241                         break;
 242                 case 14:
 243                         if(!FLAC__bitbuffer_write_raw_uint32(bb, header->sample_rate / 10, 16))
 244                                 return false;
 245                         break;
 246         }
 247
 248         /* write the CRC */
 249         FLAC__ASSERT(bb->buffer[crc8_start] == 0xff); /* MAGIC NUMBER for the first byte of the sync code */
 250         FLAC__ASSERT(bb->bits == 0); /* assert that we're byte-aligned */
 251         crc8 = FLAC__crc8(bb->buffer+crc8_start, bb->bytes-crc8_start);
 252         if(!FLAC__bitbuffer_write_raw_uint32(bb, crc8, FLAC__FRAME_HEADER_CRC_LEN))
 253                 return false;
 254
 255         return true;
 256 }
 257
 258 FLAC__bool FLAC__subframe_add_constant(const FLAC__Subframe_Constant *subframe, unsigned subframe_bps, unsigned wasted_bits, FLAC__BitBuffer *bb)
 259 {
 260         FLAC__bool ok;
 261
 262         ok =
 263                 FLAC__bitbuffer_write_raw_uint32(bb, FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK | (wasted_bits? 1:0), FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN) &&
 264                 (wasted_bits? FLAC__bitbuffer_write_unary_unsigned(bb, wasted_bits-1) : true) &&
 265                 FLAC__bitbuffer_write_raw_int32(bb, subframe->value, subframe_bps)
 266         ;
 267
 268         return ok;
 269 }
 270
 271 FLAC__bool FLAC__subframe_add_fixed(const FLAC__Subframe_Fixed *subframe, unsigned residual_samples, unsigned subframe_bps, unsigned wasted_bits, FLAC__BitBuffer *bb)
 272 {
 273         unsigned i;
 274
 275         if(!FLAC__bitbuffer_write_raw_uint32(bb, FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK | (subframe->order<<1) | (wasted_bits? 1:0), FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN))
 276                 return false;
 277         if(wasted_bits)
 278                 if(!FLAC__bitbuffer_write_unary_unsigned(bb, wasted_bits-1))
 279                         return false;
 280
 281         for(i = 0; i < subframe->order; i++)
 282                 if(!FLAC__bitbuffer_write_raw_int32(bb, subframe->warmup[i], subframe_bps))
 283                         return false;
 284
 285         if(!subframe_add_entropy_coding_method_(bb, &subframe->entropy_coding_method))
 286                 return false;
 287         switch(subframe->entropy_coding_method.type) {
 288                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
 289                         if(!subframe_add_residual_partitioned_rice_(bb, subframe->residual, residual_samples, subframe->order, subframe->entropy_coding_method.data.partitioned_rice.parameters, subframe->entropy_coding_method.data.partitioned_rice.raw_bits, subframe->entropy_coding_method.data.partitioned_rice.order))
 290                                 return false;
 291                         break;
 292                 default:
 293                         FLAC__ASSERT(0);
 294         }
 295
 296         return true;
 297 }
 298
 299 FLAC__bool FLAC__subframe_add_lpc(const FLAC__Subframe_LPC *subframe, unsigned residual_samples, unsigned subframe_bps, unsigned wasted_bits, FLAC__BitBuffer *bb)
 300 {
 301         unsigned i;
 302
 303         if(!FLAC__bitbuffer_write_raw_uint32(bb, FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK | ((subframe->order-1)<<1) | (wasted_bits? 1:0), FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN))
 304                 return false;
 305         if(wasted_bits)
 306                 if(!FLAC__bitbuffer_write_unary_unsigned(bb, wasted_bits-1))
 307                         return false;
 308
 309         for(i = 0; i < subframe->order; i++)
 310                 if(!FLAC__bitbuffer_write_raw_int32(bb, subframe->warmup[i], subframe_bps))
 311                         return false;
 312
 313         if(!FLAC__bitbuffer_write_raw_uint32(bb, subframe->qlp_coeff_precision-1, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
 314                 return false;
 315         if(!FLAC__bitbuffer_write_raw_int32(bb, subframe->quantization_level, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
 316                 return false;
 317         for(i = 0; i < subframe->order; i++)
 318                 if(!FLAC__bitbuffer_write_raw_int32(bb, subframe->qlp_coeff[i], subframe->qlp_coeff_precision))
 319                         return false;
 320
 321         if(!subframe_add_entropy_coding_method_(bb, &subframe->entropy_coding_method))
 322                 return false;
 323         switch(subframe->entropy_coding_method.type) {
 324                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
 325                         if(!subframe_add_residual_partitioned_rice_(bb, subframe->residual, residual_samples, subframe->order, subframe->entropy_coding_method.data.partitioned_rice.parameters, subframe->entropy_coding_method.data.partitioned_rice.raw_bits, subframe->entropy_coding_method.data.partitioned_rice.order))
 326                                 return false;
 327                         break;
 328                 default:
 329                         FLAC__ASSERT(0);
 330         }
 331
 332         return true;
 333 }
 334
 335 FLAC__bool FLAC__subframe_add_verbatim(const FLAC__Subframe_Verbatim *subframe, unsigned samples, unsigned subframe_bps, unsigned wasted_bits, FLAC__BitBuffer *bb)
 336 {
 337         unsigned i;
 338         const FLAC__int32 *signal = subframe->data;
 339
 340         if(!FLAC__bitbuffer_write_raw_uint32(bb, FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK | (wasted_bits? 1:0), FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN))
 341                 return false;
 342         if(wasted_bits)
 343                 if(!FLAC__bitbuffer_write_unary_unsigned(bb, wasted_bits-1))
 344                         return false;
 345
 346         for(i = 0; i < samples; i++)
 347                 if(!FLAC__bitbuffer_write_raw_int32(bb, signal[i], subframe_bps))
 348                         return false;
 349
 350         return true;
 351 }
 352
 353 FLAC__bool subframe_add_entropy_coding_method_(FLAC__BitBuffer *bb, const FLAC__EntropyCodingMethod *method)
 354 {
 355         if(!FLAC__bitbuffer_write_raw_uint32(bb, method->type, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
 356                 return false;
 357         switch(method->type) {
 358                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
 359                         if(!FLAC__bitbuffer_write_raw_uint32(bb, method->data.partitioned_rice.order, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
 360                                 return false;
 361                         break;
 362                 default:
 363                         FLAC__ASSERT(0);
 364         }
 365         return true;
 366 }
 367
 368 FLAC__bool subframe_add_residual_partitioned_rice_(FLAC__BitBuffer *bb, const FLAC__int32 residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned rice_parameters[], const unsigned raw_bits[], const unsigned partition_order)
 369 {
 370         if(partition_order == 0) {
 371                 unsigned i;
 372
 373                 if(!FLAC__bitbuffer_write_raw_uint32(bb, rice_parameters[0], FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
 374                         return false;
 375                 if(rice_parameters[0] < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
 376                         for(i = 0; i < residual_samples; i++) {
 377 #ifdef FLAC__SYMMETRIC_RICE
 378                                 if(!FLAC__bitbuffer_write_symmetric_rice_signed(bb, residual[i], rice_parameters[0]))
 379                                         return false;
 380 #else
 381                                 if(!FLAC__bitbuffer_write_rice_signed(bb, residual[i], rice_parameters[0]))
 382                                         return false;
 383 #endif
 384                         }
 385                 }
 386                 else {
 387                         if(!FLAC__bitbuffer_write_raw_uint32(bb, raw_bits[0], FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
 388                                 return false;
 389                         for(i = 0; i < residual_samples; i++) {
 390                                 if(!FLAC__bitbuffer_write_raw_int32(bb, residual[i], raw_bits[0]))
 391                                         return false;
 392                         }
 393                 }
 394                 return true;
 395         }
 396         else {
 397                 unsigned i, j, k = 0, k_last = 0;
 398                 unsigned partition_samples;
 399                 const unsigned default_partition_samples = (residual_samples+predictor_order) >> partition_order;
 400                 for(i = 0; i < (1u<<partition_order); i++) {
 401                         if(!FLAC__bitbuffer_write_raw_uint32(bb, rice_parameters[i], FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
 402                                 return false;
 403                         partition_samples = default_partition_samples;
 404                         if(i == 0)
 405                                 partition_samples -= predictor_order;
 406                         k += partition_samples;
 407                         if(rice_parameters[i] < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
 408                                 for(j = k_last; j < k; j++) {
 409 #ifdef FLAC__SYMMETRIC_RICE
 410                                         if(!FLAC__bitbuffer_write_symmetric_rice_signed(bb, residual[j], rice_parameters[i]))
 411                                                 return false;
 412 #else
 413                                         if(!FLAC__bitbuffer_write_rice_signed(bb, residual[j], rice_parameters[i]))
 414                                                 return false;
 415 #endif
 416                                 }
 417                         }
 418                         else {
 419                                 if(!FLAC__bitbuffer_write_raw_uint32(bb, raw_bits[i], FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
 420                                         return false;
 421                                 for(j = k_last; j < k; j++) {
 422                                         if(!FLAC__bitbuffer_write_raw_int32(bb, residual[j], raw_bits[i]))
 423                                                 return false;
 424                                 }
 425                         }
 426                         k_last = k;
 427                 }
 428                 return true;
 429         }
 430 }