src/libFLAC/stream_encoder_framing.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002  Josh Coalson
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA  02111-1307, USA.
  18  */
  19
  20 #include <stdio.h>
  21 #include <string.h> /* for strlen() */
  22 #include "private/stream_encoder_framing.h"
  23 #include "private/crc.h"
  24 #include "FLAC/assert.h"
  25
  26 #ifdef max
  27 #undef max
  28 #endif
  29 #define max(x,y) ((x)>(y)?(x):(y))
  30
  31 static FLAC__bool add_entropy_coding_method_(FLAC__BitBuffer *bb, const FLAC__EntropyCodingMethod *method);
  32 static FLAC__bool 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);
  33
  34 FLAC__bool FLAC__add_metadata_block(const FLAC__StreamMetadata *metadata, FLAC__BitBuffer *bb)
  35 {
  36         unsigned i;
  37         const unsigned vendor_string_length = (unsigned)strlen(FLAC__VENDOR_STRING);
  38
  39         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->is_last, FLAC__STREAM_METADATA_IS_LAST_LEN))
  40                 return false;
  41
  42         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->type, FLAC__STREAM_METADATA_TYPE_LEN))
  43                 return false;
  44
  45         /*
  46          * First, for VORBIS_COMMENTs, adjust the length to reflect our vendor string
  47          */
  48         i = metadata->length;
  49         if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
  50                 FLAC__ASSERT(metadata->data.vorbis_comment.vendor_string.length == 0 || 0 != metadata->data.vorbis_comment.vendor_string.entry);
  51                 i -= metadata->data.vorbis_comment.vendor_string.length;
  52                 i += vendor_string_length;
  53         }
  54         FLAC__ASSERT(i < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
  55         if(!FLAC__bitbuffer_write_raw_uint32(bb, i, FLAC__STREAM_METADATA_LENGTH_LEN))
  56                 return false;
  57
  58         switch(metadata->type) {
  59                 case FLAC__METADATA_TYPE_STREAMINFO:
  60                         FLAC__ASSERT(metadata->data.stream_info.min_blocksize < (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN));
  61                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.min_blocksize, FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN))
  62                                 return false;
  63                         FLAC__ASSERT(metadata->data.stream_info.max_blocksize < (1u << FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN));
  64                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.max_blocksize, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
  65                                 return false;
  66                         FLAC__ASSERT(metadata->data.stream_info.min_framesize < (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN));
  67                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.min_framesize, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
  68                                 return false;
  69                         FLAC__ASSERT(metadata->data.stream_info.max_framesize < (1u << FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN));
  70                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.max_framesize, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
  71                                 return false;
  72                         FLAC__ASSERT(FLAC__format_sample_rate_is_valid(metadata->data.stream_info.sample_rate));
  73                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.sample_rate, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
  74                                 return false;
  75                         FLAC__ASSERT(metadata->data.stream_info.channels > 0);
  76                         FLAC__ASSERT(metadata->data.stream_info.channels <= (1u << FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN));
  77                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.channels-1, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
  78                                 return false;
  79                         FLAC__ASSERT(metadata->data.stream_info.bits_per_sample > 0);
  80                         FLAC__ASSERT(metadata->data.stream_info.bits_per_sample <= (1u << FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN));
  81                         if(!FLAC__bitbuffer_write_raw_uint32(bb, metadata->data.stream_info.bits_per_sample-1, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
  82                                 return false;
  83                         if(!FLAC__bitbuffer_write_raw_uint64(bb, metadata->data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN))
  84                                 return false;
  85                         if(!FLAC__bitbuffer_write_byte_block(bb, metadata->data.stream_info.md5sum, 16))
  86                                 return false;
  87                         break;
  88                 case FLAC__METADATA_TYPE_PADDING:
  89                         if(!FLAC__bitbuffer_write_zeroes(bb, metadata->length * 8))
  90                                 return false;
  91                         break;
  92                 case FLAC__METADATA_TYPE_APPLICATION:
  93                         if(!FLAC__bitbuffer_write_byte_block(bb, metadata->data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8))
  94                                 return false;
  95                         if(!FLAC__bitbuffer_write_byte_block(bb, metadata->data.application.data, metadata->length - (FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8)))
  96                                 return false;
  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                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 109                         if(!FLAC__bitbuffer_write_raw_uint32_little_endian(bb, vendor_string_length))
 110                                 return false;
 111                         if(!FLAC__bitbuffer_write_byte_block(bb, (const FLAC__byte*)FLAC__VENDOR_STRING, vendor_string_length))
 112                                 return false;
 113                         if(!FLAC__bitbuffer_write_raw_uint32_little_endian(bb, metadata->data.vorbis_comment.num_comments))
 114                                 return false;
 115                         for(i = 0; i < metadata->data.vorbis_comment.num_comments; i++) {
 116                                 if(!FLAC__bitbuffer_write_raw_uint32_little_endian(bb, metadata->data.vorbis_comment.comments[i].length))
 117                                         return false;
 118                                 if(!FLAC__bitbuffer_write_byte_block(bb, metadata->data.vorbis_comment.comments[i].entry, metadata->data.vorbis_comment.comments[i].length))
 119                                         return false;
 120                         }
 121                         break;
 122                 default:
 123                         FLAC__ASSERT(0);
 124         }
 125
 126         return true;
 127 }
 128
 129 FLAC__bool FLAC__frame_add_header(const FLAC__FrameHeader *header, FLAC__bool streamable_subset, FLAC__bool is_last_block, FLAC__BitBuffer *bb)
 130 {
 131         unsigned u, blocksize_hint, sample_rate_hint;
 132
 133         FLAC__ASSERT(FLAC__bitbuffer_is_byte_aligned(bb));
 134
 135         if(!FLAC__bitbuffer_write_raw_uint32(bb, FLAC__FRAME_HEADER_SYNC, FLAC__FRAME_HEADER_SYNC_LEN))
 136                 return false;
 137
 138         if(!FLAC__bitbuffer_write_raw_uint32(bb, 0, FLAC__FRAME_HEADER_RESERVED_LEN))
 139                 return false;
 140
 141         FLAC__ASSERT(header->blocksize > 0 && header->blocksize <= FLAC__MAX_BLOCK_SIZE);
 142         blocksize_hint = 0;
 143         switch(header->blocksize) {
 144                 case   192: u = 1; break;
 145                 case   576: u = 2; break;
 146                 case  1152: u = 3; break;
 147                 case  2304: u = 4; break;
 148                 case  4608: u = 5; break;
 149                 case   256: u = 8; break;
 150                 case   512: u = 9; break;
 151                 case  1024: u = 10; break;
 152                 case  2048: u = 11; break;
 153                 case  4096: u = 12; break;
 154                 case  8192: u = 13; break;
 155                 case 16384: u = 14; break;
 156                 case 32768: u = 15; break;
 157                 default:
 158                         if(streamable_subset || is_last_block) {
 159                                 if(header->blocksize <= 0x100)
 160                                         blocksize_hint = u = 6;
 161                                 else
 162                                         blocksize_hint = u = 7;
 163                         }
 164                         else
 165                                 u = 0;
 166                         break;
 167         }
 168         if(!FLAC__bitbuffer_write_raw_uint32(bb, u, FLAC__FRAME_HEADER_BLOCK_SIZE_LEN))
 169                 return false;
 170
 171         FLAC__ASSERT(FLAC__format_sample_rate_is_valid(header->sample_rate));
 172         sample_rate_hint = 0;
 173         switch(header->sample_rate) {
 174                 case  8000: u = 4; break;
 175                 case 16000: u = 5; break;
 176                 case 22050: u = 6; break;
 177                 case 24000: u = 7; break;
 178                 case 32000: u = 8; break;
 179                 case 44100: u = 9; break;
 180                 case 48000: u = 10; break;
 181                 case 96000: u = 11; break;
 182                 default:
 183                         if(streamable_subset) {
 184                                 if(header->sample_rate % 1000 == 0)
 185                                         sample_rate_hint = u = 12;
 186                                 else if(header->sample_rate % 10 == 0)
 187                                         sample_rate_hint = u = 14;
 188                                 else
 189                                         sample_rate_hint = u = 13;
 190                         }
 191                         else
 192                                 u = 0;
 193                         break;
 194         }
 195         if(!FLAC__bitbuffer_write_raw_uint32(bb, u, FLAC__FRAME_HEADER_SAMPLE_RATE_LEN))
 196                 return false;
 197
 198         FLAC__ASSERT(header->channels > 0 && header->channels <= (1u << FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN) && header->channels <= FLAC__MAX_CHANNELS);
 199         switch(header->channel_assignment) {
 200                 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
 201                         u = header->channels - 1;
 202                         break;
 203                 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
 204                         FLAC__ASSERT(header->channels == 2);
 205                         u = 8;
 206                         break;
 207                 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
 208                         FLAC__ASSERT(header->channels == 2);
 209                         u = 9;
 210                         break;
 211                 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
 212                         FLAC__ASSERT(header->channels == 2);
 213                         u = 10;
 214                         break;
 215                 default:
 216                         FLAC__ASSERT(0);
 217         }
 218         if(!FLAC__bitbuffer_write_raw_uint32(bb, u, FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN))
 219                 return false;
 220
 221         FLAC__ASSERT(header->bits_per_sample > 0 && header->bits_per_sample <= (1u << FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN));
 222         switch(header->bits_per_sample) {
 223                 case 8 : u = 1; break;
 224                 case 12: u = 2; break;
 225                 case 16: u = 4; break;
 226                 case 20: u = 5; break;
 227                 case 24: u = 6; break;
 228                 default: u = 0; break;
 229         }
 230         if(!FLAC__bitbuffer_write_raw_uint32(bb, u, FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN))
 231                 return false;
 232
 233         if(!FLAC__bitbuffer_write_raw_uint32(bb, 0, FLAC__FRAME_HEADER_ZERO_PAD_LEN))
 234                 return false;
 235
 236         FLAC__ASSERT(header->number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER);
 237         if(!FLAC__bitbuffer_write_utf8_uint32(bb, header->number.frame_number))
 238                 return false;
 239
 240         if(blocksize_hint)
 241                 if(!FLAC__bitbuffer_write_raw_uint32(bb, header->blocksize-1, (blocksize_hint==6)? 8:16))
 242                         return false;
 243
 244         switch(sample_rate_hint) {
 245                 case 12:
 246                         if(!FLAC__bitbuffer_write_raw_uint32(bb, header->sample_rate / 1000, 8))
 247                                 return false;
 248                         break;
 249                 case 13:
 250                         if(!FLAC__bitbuffer_write_raw_uint32(bb, header->sample_rate, 16))
 251                                 return false;
 252                         break;
 253                 case 14:
 254                         if(!FLAC__bitbuffer_write_raw_uint32(bb, header->sample_rate / 10, 16))
 255                                 return false;
 256                         break;
 257         }
 258
 259         /* write the CRC */
 260         if(!FLAC__bitbuffer_write_raw_uint32(bb, FLAC__bitbuffer_get_write_crc8(bb), FLAC__FRAME_HEADER_CRC_LEN))
 261                 return false;
 262
 263         return true;
 264 }
 265
 266 FLAC__bool FLAC__subframe_add_constant(const FLAC__Subframe_Constant *subframe, unsigned subframe_bps, unsigned wasted_bits, FLAC__BitBuffer *bb)
 267 {
 268         FLAC__bool ok;
 269
 270         ok =
 271                 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) &&
 272                 (wasted_bits? FLAC__bitbuffer_write_unary_unsigned(bb, wasted_bits-1) : true) &&
 273                 FLAC__bitbuffer_write_raw_int32(bb, subframe->value, subframe_bps)
 274         ;
 275
 276         return ok;
 277 }
 278
 279 FLAC__bool FLAC__subframe_add_fixed(const FLAC__Subframe_Fixed *subframe, unsigned residual_samples, unsigned subframe_bps, unsigned wasted_bits, FLAC__BitBuffer *bb)
 280 {
 281         unsigned i;
 282
 283         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))
 284                 return false;
 285         if(wasted_bits)
 286                 if(!FLAC__bitbuffer_write_unary_unsigned(bb, wasted_bits-1))
 287                         return false;
 288
 289         for(i = 0; i < subframe->order; i++)
 290                 if(!FLAC__bitbuffer_write_raw_int32(bb, subframe->warmup[i], subframe_bps))
 291                         return false;
 292
 293         if(!add_entropy_coding_method_(bb, &subframe->entropy_coding_method))
 294                 return false;
 295         switch(subframe->entropy_coding_method.type) {
 296                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
 297                         if(!add_residual_partitioned_rice_(bb, subframe->residual, residual_samples, subframe->order, subframe->entropy_coding_method.data.partitioned_rice.contents->parameters, subframe->entropy_coding_method.data.partitioned_rice.contents->raw_bits, subframe->entropy_coding_method.data.partitioned_rice.order))
 298                                 return false;
 299                         break;
 300                 default:
 301                         FLAC__ASSERT(0);
 302         }
 303
 304         return true;
 305 }
 306
 307 FLAC__bool FLAC__subframe_add_lpc(const FLAC__Subframe_LPC *subframe, unsigned residual_samples, unsigned subframe_bps, unsigned wasted_bits, FLAC__BitBuffer *bb)
 308 {
 309         unsigned i;
 310
 311         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))
 312                 return false;
 313         if(wasted_bits)
 314                 if(!FLAC__bitbuffer_write_unary_unsigned(bb, wasted_bits-1))
 315                         return false;
 316
 317         for(i = 0; i < subframe->order; i++)
 318                 if(!FLAC__bitbuffer_write_raw_int32(bb, subframe->warmup[i], subframe_bps))
 319                         return false;
 320
 321         if(!FLAC__bitbuffer_write_raw_uint32(bb, subframe->qlp_coeff_precision-1, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
 322                 return false;
 323         if(!FLAC__bitbuffer_write_raw_int32(bb, subframe->quantization_level, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
 324                 return false;
 325         for(i = 0; i < subframe->order; i++)
 326                 if(!FLAC__bitbuffer_write_raw_int32(bb, subframe->qlp_coeff[i], subframe->qlp_coeff_precision))
 327                         return false;
 328
 329         if(!add_entropy_coding_method_(bb, &subframe->entropy_coding_method))
 330                 return false;
 331         switch(subframe->entropy_coding_method.type) {
 332                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
 333                         if(!add_residual_partitioned_rice_(bb, subframe->residual, residual_samples, subframe->order, subframe->entropy_coding_method.data.partitioned_rice.contents->parameters, subframe->entropy_coding_method.data.partitioned_rice.contents->raw_bits, subframe->entropy_coding_method.data.partitioned_rice.order))
 334                                 return false;
 335                         break;
 336                 default:
 337                         FLAC__ASSERT(0);
 338         }
 339
 340         return true;
 341 }
 342
 343 FLAC__bool FLAC__subframe_add_verbatim(const FLAC__Subframe_Verbatim *subframe, unsigned samples, unsigned subframe_bps, unsigned wasted_bits, FLAC__BitBuffer *bb)
 344 {
 345         unsigned i;
 346         const FLAC__int32 *signal = subframe->data;
 347
 348         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))
 349                 return false;
 350         if(wasted_bits)
 351                 if(!FLAC__bitbuffer_write_unary_unsigned(bb, wasted_bits-1))
 352                         return false;
 353
 354         for(i = 0; i < samples; i++)
 355                 if(!FLAC__bitbuffer_write_raw_int32(bb, signal[i], subframe_bps))
 356                         return false;
 357
 358         return true;
 359 }
 360
 361 FLAC__bool add_entropy_coding_method_(FLAC__BitBuffer *bb, const FLAC__EntropyCodingMethod *method)
 362 {
 363         if(!FLAC__bitbuffer_write_raw_uint32(bb, method->type, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
 364                 return false;
 365         switch(method->type) {
 366                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
 367                         if(!FLAC__bitbuffer_write_raw_uint32(bb, method->data.partitioned_rice.order, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
 368                                 return false;
 369                         break;
 370                 default:
 371                         FLAC__ASSERT(0);
 372         }
 373         return true;
 374 }
 375
 376 FLAC__bool 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)
 377 {
 378         if(partition_order == 0) {
 379                 unsigned i;
 380
 381                 if(!FLAC__bitbuffer_write_raw_uint32(bb, rice_parameters[0], FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
 382                         return false;
 383                 if(rice_parameters[0] < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
 384                         for(i = 0; i < residual_samples; i++) {
 385 #ifdef FLAC__SYMMETRIC_RICE
 386                                 if(!FLAC__bitbuffer_write_symmetric_rice_signed(bb, residual[i], rice_parameters[0]))
 387                                         return false;
 388 #else
 389                                 if(!FLAC__bitbuffer_write_rice_signed(bb, residual[i], rice_parameters[0]))
 390                                         return false;
 391 #endif
 392                         }
 393                 }
 394                 else {
 395                         if(!FLAC__bitbuffer_write_raw_uint32(bb, raw_bits[0], FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
 396                                 return false;
 397                         for(i = 0; i < residual_samples; i++) {
 398                                 if(!FLAC__bitbuffer_write_raw_int32(bb, residual[i], raw_bits[0]))
 399                                         return false;
 400                         }
 401                 }
 402                 return true;
 403         }
 404         else {
 405                 unsigned i, j, k = 0, k_last = 0;
 406                 unsigned partition_samples;
 407                 const unsigned default_partition_samples = (residual_samples+predictor_order) >> partition_order;
 408                 for(i = 0; i < (1u<<partition_order); i++) {
 409                         if(!FLAC__bitbuffer_write_raw_uint32(bb, rice_parameters[i], FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
 410                                 return false;
 411                         partition_samples = default_partition_samples;
 412                         if(i == 0)
 413                                 partition_samples -= predictor_order;
 414                         k += partition_samples;
 415                         if(rice_parameters[i] < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
 416                                 for(j = k_last; j < k; j++) {
 417 #ifdef FLAC__SYMMETRIC_RICE
 418                                         if(!FLAC__bitbuffer_write_symmetric_rice_signed(bb, residual[j], rice_parameters[i]))
 419                                                 return false;
 420 #else
 421                                         if(!FLAC__bitbuffer_write_rice_signed(bb, residual[j], rice_parameters[i]))
 422                                                 return false;
 423 #endif
 424                                 }
 425                         }
 426                         else {
 427                                 if(!FLAC__bitbuffer_write_raw_uint32(bb, raw_bits[i], FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
 428                                         return false;
 429                                 for(j = k_last; j < k; j++) {
 430                                         if(!FLAC__bitbuffer_write_raw_int32(bb, residual[j], raw_bits[i]))
 431                                                 return false;
 432                                 }
 433                         }
 434                         k_last = k;
 435                 }
 436                 return true;
 437         }
 438 }