src/libOggFLAC/stream_decoder.c

   1 /* libOggFLAC - Free Lossless Audio Codec + Ogg library
   2  * Copyright (C) 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 <stdlib.h>
  21 #include <string.h> /* for memset() */
  22 #include "ogg/ogg.h"
  23 #include "FLAC/assert.h"
  24 #include "protected/stream_decoder.h"
  25
  26 #ifdef min
  27 #undef min
  28 #endif
  29 #define min(x,y) ((x)<(y)?(x):(y))
  30
  31 /***********************************************************************
  32  *
  33  * Private class method prototypes
  34  *
  35  ***********************************************************************/
  36
  37 static void set_defaults_(OggFLAC__StreamDecoder *decoder);
  38 static FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
  39 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  40 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  41 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  42
  43
  44 /***********************************************************************
  45  *
  46  * Private class data
  47  *
  48  ***********************************************************************/
  49
  50 typedef struct OggFLAC__StreamDecoderPrivate {
  51         OggFLAC__StreamDecoderReadCallback read_callback;
  52         OggFLAC__StreamDecoderWriteCallback write_callback;
  53         OggFLAC__StreamDecoderMetadataCallback metadata_callback;
  54         OggFLAC__StreamDecoderErrorCallback error_callback;
  55         void *client_data;
  56         FLAC__StreamDecoder *FLAC_stream_decoder;
  57         struct {
  58                 ogg_stream_state stream_state;
  59                 ogg_sync_state sync_state;
  60         } ogg;
  61 } OggFLAC__StreamDecoderPrivate;
  62
  63 /***********************************************************************
  64  *
  65  * Public static class data
  66  *
  67  ***********************************************************************/
  68
  69 const char * const OggFLAC__StreamDecoderStateString[] = {
  70         "OggFLAC__STREAM_DECODER_OK",
  71         "OggFLAC__STREAM_DECODER_OGG_ERROR",
  72         "OggFLAC__STREAM_DECODER_READ_ERROR",
  73         "OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR",
  74         "OggFLAC__STREAM_DECODER_INVALID_CALLBACK",
  75         "OggFLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
  76         "OggFLAC__STREAM_DECODER_ALREADY_INITIALIZED",
  77         "OggFLAC__STREAM_DECODER_UNINITIALIZED"
  78 };
  79
  80
  81 /***********************************************************************
  82  *
  83  * Class constructor/destructor
  84  *
  85  ***********************************************************************/
  86 OggFLAC__StreamDecoder *OggFLAC__stream_decoder_new()
  87 {
  88         OggFLAC__StreamDecoder *decoder;
  89
  90         decoder = (OggFLAC__StreamDecoder*)malloc(sizeof(OggFLAC__StreamDecoder));
  91         if(decoder == 0) {
  92                 return 0;
  93         }
  94         memset(decoder, 0, sizeof(OggFLAC__StreamDecoder));
  95
  96         decoder->protected_ = (OggFLAC__StreamDecoderProtected*)malloc(sizeof(OggFLAC__StreamDecoderProtected));
  97         if(decoder->protected_ == 0) {
  98                 free(decoder);
  99                 return 0;
 100         }
 101         memset(decoder->protected_, 0, sizeof(OggFLAC__StreamDecoderProtected));
 102
 103         decoder->private_ = (OggFLAC__StreamDecoderPrivate*)malloc(sizeof(OggFLAC__StreamDecoderPrivate));
 104         if(decoder->private_ == 0) {
 105                 free(decoder->protected_);
 106                 free(decoder);
 107                 return 0;
 108         }
 109         memset(decoder->private_, 0, sizeof(OggFLAC__StreamDecoderPrivate));
 110
 111         decoder->private_->FLAC_stream_decoder = FLAC__stream_decoder_new();
 112         if(0 == decoder->private_->FLAC_stream_decoder) {
 113                 free(decoder->private_);
 114                 free(decoder->protected_);
 115                 free(decoder);
 116                 return 0;
 117         }
 118
 119         set_defaults_(decoder);
 120
 121         decoder->protected_->state = OggFLAC__STREAM_DECODER_UNINITIALIZED;
 122
 123         return decoder;
 124 }
 125
 126 void OggFLAC__stream_decoder_delete(OggFLAC__StreamDecoder *decoder)
 127 {
 128         FLAC__ASSERT(0 != decoder);
 129         FLAC__ASSERT(0 != decoder->protected_);
 130         FLAC__ASSERT(0 != decoder->private_);
 131         FLAC__ASSERT(0 != decoder->private_->FLAC_stream_decoder);
 132
 133         OggFLAC__stream_decoder_finish(decoder);
 134
 135     FLAC__stream_decoder_delete(decoder->private_->FLAC_stream_decoder);
 136
 137         free(decoder->private_);
 138         free(decoder->protected_);
 139         free(decoder);
 140 }
 141
 142 /***********************************************************************
 143  *
 144  * Public class methods
 145  *
 146  ***********************************************************************/
 147
 148 OggFLAC__StreamDecoderState OggFLAC__stream_decoder_init(OggFLAC__StreamDecoder *decoder)
 149 {
 150         FLAC__ASSERT(0 != decoder);
 151
 152         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 153                 return decoder->protected_->state = OggFLAC__STREAM_DECODER_ALREADY_INITIALIZED;
 154
 155         if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 156                 return decoder->protected_->state = OggFLAC__STREAM_DECODER_INVALID_CALLBACK;
 157
 158         if(ogg_stream_init(&decoder->private_->ogg.stream_state, 0) != 0)
 159                 return decoder->protected_->state = OggFLAC__STREAM_DECODER_OGG_ERROR;
 160
 161         if(ogg_sync_init(&decoder->private_->ogg.sync_state) != 0)
 162                 return decoder->protected_->state = OggFLAC__STREAM_DECODER_OGG_ERROR;
 163
 164     FLAC__stream_decoder_set_read_callback(decoder->private_->FLAC_stream_decoder, read_callback_);
 165     FLAC__stream_decoder_set_write_callback(decoder->private_->FLAC_stream_decoder, write_callback_);
 166     FLAC__stream_decoder_set_metadata_callback(decoder->private_->FLAC_stream_decoder, metadata_callback_);
 167     FLAC__stream_decoder_set_error_callback(decoder->private_->FLAC_stream_decoder, error_callback_);
 168     FLAC__stream_decoder_set_client_data(decoder->private_->FLAC_stream_decoder, decoder);
 169
 170     if(FLAC__stream_decoder_init(decoder->private_->FLAC_stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA)
 171         return decoder->protected_->state = OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR;
 172
 173         return decoder->protected_->state = OggFLAC__STREAM_DECODER_OK;
 174 }
 175
 176 void OggFLAC__stream_decoder_finish(OggFLAC__StreamDecoder *decoder)
 177 {
 178         FLAC__ASSERT(0 != decoder);
 179         FLAC__ASSERT(0 != decoder->private_);
 180         FLAC__ASSERT(0 != decoder->protected_);
 181
 182         if(decoder->protected_->state == OggFLAC__STREAM_DECODER_UNINITIALIZED)
 183                 return;
 184
 185         FLAC__ASSERT(0 != decoder->private_->FLAC_stream_decoder);
 186
 187         FLAC__stream_decoder_finish(decoder->private_->FLAC_stream_decoder);
 188
 189         (void)ogg_sync_clear(&decoder->private_->ogg.sync_state);
 190         (void)ogg_stream_clear(&decoder->private_->ogg.stream_state);
 191
 192         set_defaults_(decoder);
 193
 194         decoder->protected_->state = OggFLAC__STREAM_DECODER_UNINITIALIZED;
 195 }
 196
 197 FLAC__bool OggFLAC__stream_decoder_set_read_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderReadCallback value)
 198 {
 199         FLAC__ASSERT(0 != decoder);
 200         FLAC__ASSERT(0 != decoder->private_);
 201         FLAC__ASSERT(0 != decoder->protected_);
 202         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 203                 return false;
 204         decoder->private_->read_callback = value;
 205         return true;
 206 }
 207
 208 FLAC__bool OggFLAC__stream_decoder_set_write_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderWriteCallback value)
 209 {
 210         FLAC__ASSERT(0 != decoder);
 211         FLAC__ASSERT(0 != decoder->private_);
 212         FLAC__ASSERT(0 != decoder->protected_);
 213         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 214                 return false;
 215         decoder->private_->write_callback = value;
 216         return true;
 217 }
 218
 219 FLAC__bool OggFLAC__stream_decoder_set_metadata_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderMetadataCallback value)
 220 {
 221         FLAC__ASSERT(0 != decoder);
 222         FLAC__ASSERT(0 != decoder->private_);
 223         FLAC__ASSERT(0 != decoder->protected_);
 224         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 225                 return false;
 226         decoder->private_->metadata_callback = value;
 227         return true;
 228 }
 229
 230 FLAC__bool OggFLAC__stream_decoder_set_error_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderErrorCallback value)
 231 {
 232         FLAC__ASSERT(0 != decoder);
 233         FLAC__ASSERT(0 != decoder->private_);
 234         FLAC__ASSERT(0 != decoder->protected_);
 235         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 236                 return false;
 237         decoder->private_->error_callback = value;
 238         return true;
 239 }
 240
 241 FLAC__bool OggFLAC__stream_decoder_set_client_data(OggFLAC__StreamDecoder *decoder, void *value)
 242 {
 243         FLAC__ASSERT(0 != decoder);
 244         FLAC__ASSERT(0 != decoder->private_);
 245         FLAC__ASSERT(0 != decoder->protected_);
 246         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 247                 return false;
 248         decoder->private_->client_data = value;
 249         return true;
 250 }
 251
 252 FLAC__bool OggFLAC__stream_decoder_set_metadata_respond(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 253 {
 254         FLAC__ASSERT(0 != decoder);
 255         FLAC__ASSERT(0 != decoder->private_);
 256         FLAC__ASSERT(0 != decoder->protected_);
 257         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 258                 return false;
 259         return FLAC__stream_decoder_set_metadata_respond(decoder->private_->FLAC_stream_decoder, type);
 260 }
 261
 262 FLAC__bool OggFLAC__stream_decoder_set_metadata_respond_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 263 {
 264         FLAC__ASSERT(0 != decoder);
 265         FLAC__ASSERT(0 != decoder->private_);
 266         FLAC__ASSERT(0 != decoder->protected_);
 267         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 268                 return false;
 269         return FLAC__stream_decoder_set_metadata_respond_application(decoder->private_->FLAC_stream_decoder, id);
 270 }
 271
 272 FLAC__bool OggFLAC__stream_decoder_set_metadata_respond_all(OggFLAC__StreamDecoder *decoder)
 273 {
 274         FLAC__ASSERT(0 != decoder);
 275         FLAC__ASSERT(0 != decoder->private_);
 276         FLAC__ASSERT(0 != decoder->protected_);
 277         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 278                 return false;
 279         return FLAC__stream_decoder_set_metadata_respond_all(decoder->private_->FLAC_stream_decoder);
 280 }
 281
 282 FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 283 {
 284         FLAC__ASSERT(0 != decoder);
 285         FLAC__ASSERT(0 != decoder->private_);
 286         FLAC__ASSERT(0 != decoder->protected_);
 287         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 288                 return false;
 289         return FLAC__stream_decoder_set_metadata_ignore(decoder->private_->FLAC_stream_decoder, type);
 290 }
 291
 292 FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 293 {
 294         FLAC__ASSERT(0 != decoder);
 295         FLAC__ASSERT(0 != decoder->private_);
 296         FLAC__ASSERT(0 != decoder->protected_);
 297         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 298                 return false;
 299         return FLAC__stream_decoder_set_metadata_ignore_application(decoder->private_->FLAC_stream_decoder, id);
 300 }
 301
 302 FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_all(OggFLAC__StreamDecoder *decoder)
 303 {
 304         FLAC__ASSERT(0 != decoder);
 305         FLAC__ASSERT(0 != decoder->private_);
 306         FLAC__ASSERT(0 != decoder->protected_);
 307         if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
 308                 return false;
 309         return FLAC__stream_decoder_set_metadata_ignore_all(decoder->private_->FLAC_stream_decoder);
 310 }
 311
 312 OggFLAC__StreamDecoderState OggFLAC__stream_decoder_get_state(const OggFLAC__StreamDecoder *decoder)
 313 {
 314         FLAC__ASSERT(0 != decoder);
 315         FLAC__ASSERT(0 != decoder->protected_);
 316         return decoder->protected_->state;
 317 }
 318
 319 FLAC__StreamDecoderState OggFLAC__stream_decoder_get_FLAC_stream_decoder_state(const OggFLAC__StreamDecoder *decoder)
 320 {
 321         FLAC__ASSERT(0 != decoder);
 322         FLAC__ASSERT(0 != decoder->private_);
 323         return FLAC__stream_decoder_get_state(decoder->private_->FLAC_stream_decoder);
 324 }
 325
 326 unsigned OggFLAC__stream_decoder_get_channels(const OggFLAC__StreamDecoder *decoder)
 327 {
 328         FLAC__ASSERT(0 != decoder);
 329         FLAC__ASSERT(0 != decoder->private_);
 330         return FLAC__stream_decoder_get_channels(decoder->private_->FLAC_stream_decoder);
 331 }
 332
 333 FLAC__ChannelAssignment OggFLAC__stream_decoder_get_channel_assignment(const OggFLAC__StreamDecoder *decoder)
 334 {
 335         FLAC__ASSERT(0 != decoder);
 336         FLAC__ASSERT(0 != decoder->private_);
 337         return FLAC__stream_decoder_get_channel_assignment(decoder->private_->FLAC_stream_decoder);
 338 }
 339
 340 unsigned OggFLAC__stream_decoder_get_bits_per_sample(const OggFLAC__StreamDecoder *decoder)
 341 {
 342         FLAC__ASSERT(0 != decoder);
 343         FLAC__ASSERT(0 != decoder->private_);
 344         return FLAC__stream_decoder_get_bits_per_sample(decoder->private_->FLAC_stream_decoder);
 345 }
 346
 347 unsigned OggFLAC__stream_decoder_get_sample_rate(const OggFLAC__StreamDecoder *decoder)
 348 {
 349         FLAC__ASSERT(0 != decoder);
 350         FLAC__ASSERT(0 != decoder->private_);
 351         return FLAC__stream_decoder_get_sample_rate(decoder->private_->FLAC_stream_decoder);
 352 }
 353
 354 unsigned OggFLAC__stream_decoder_get_blocksize(const OggFLAC__StreamDecoder *decoder)
 355 {
 356         FLAC__ASSERT(0 != decoder);
 357         FLAC__ASSERT(0 != decoder->private_);
 358         return FLAC__stream_decoder_get_blocksize(decoder->private_->FLAC_stream_decoder);
 359 }
 360
 361 FLAC__bool OggFLAC__stream_decoder_flush(OggFLAC__StreamDecoder *decoder)
 362 {
 363         FLAC__ASSERT(0 != decoder);
 364         FLAC__ASSERT(0 != decoder->private_);
 365         FLAC__ASSERT(0 != decoder->protected_);
 366
 367         (void)ogg_sync_clear(&decoder->private_->ogg.sync_state);
 368
 369         if(!FLAC__stream_decoder_flush(decoder->private_->FLAC_stream_decoder)) {
 370                 decoder->protected_->state = OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR;
 371                 return false;
 372         }
 373
 374         decoder->protected_->state = OggFLAC__STREAM_DECODER_OK;
 375
 376         return true;
 377 }
 378
 379 FLAC__bool OggFLAC__stream_decoder_reset(OggFLAC__StreamDecoder *decoder)
 380 {
 381         FLAC__ASSERT(0 != decoder);
 382         FLAC__ASSERT(0 != decoder->private_);
 383         FLAC__ASSERT(0 != decoder->protected_);
 384
 385         if(!OggFLAC__stream_decoder_flush(decoder)) {
 386                 decoder->protected_->state = OggFLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 387                 return false;
 388         }
 389
 390         if(!FLAC__stream_decoder_reset(decoder->private_->FLAC_stream_decoder)) {
 391                 decoder->protected_->state = OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR;
 392                 return false;
 393         }
 394
 395         decoder->protected_->state = OggFLAC__STREAM_DECODER_OK;
 396
 397         return true;
 398 }
 399
 400 FLAC__bool OggFLAC__stream_decoder_process_single(OggFLAC__StreamDecoder *decoder)
 401 {
 402         FLAC__ASSERT(0 != decoder);
 403         FLAC__ASSERT(0 != decoder->private_);
 404         return FLAC__stream_decoder_process_single(decoder->private_->FLAC_stream_decoder);
 405 }
 406
 407 FLAC__bool OggFLAC__stream_decoder_process_until_end_of_metadata(OggFLAC__StreamDecoder *decoder)
 408 {
 409         FLAC__ASSERT(0 != decoder);
 410         FLAC__ASSERT(0 != decoder->private_);
 411         return FLAC__stream_decoder_process_until_end_of_metadata(decoder->private_->FLAC_stream_decoder);
 412 }
 413
 414 FLAC__bool OggFLAC__stream_decoder_process_until_end_of_stream(OggFLAC__StreamDecoder *decoder)
 415 {
 416         FLAC__ASSERT(0 != decoder);
 417         FLAC__ASSERT(0 != decoder->private_);
 418         return FLAC__stream_decoder_process_until_end_of_stream(decoder->private_->FLAC_stream_decoder);
 419 }
 420
 421
 422 /***********************************************************************
 423  *
 424  * Private class methods
 425  *
 426  ***********************************************************************/
 427
 428 void set_defaults_(OggFLAC__StreamDecoder *decoder)
 429 {
 430         decoder->private_->read_callback = 0;
 431         decoder->private_->write_callback = 0;
 432         decoder->private_->metadata_callback = 0;
 433         decoder->private_->error_callback = 0;
 434         decoder->private_->client_data = 0;
 435 }
 436
 437 FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *unused, FLAC__byte buffer[], unsigned *bytes, void *client_data)
 438 {
 439         static const unsigned OGG_BYTES_CHUNK = 8192;
 440         OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)client_data;
 441         unsigned ogg_bytes_to_read, ogg_bytes_read;
 442         ogg_page page;
 443         char *oggbuf;
 444
 445         (void)unused;
 446
 447         /*
 448          * We have to be careful not to read in more than the
 449          * FLAC__StreamDecoder says it has room for.  We know
 450          * that the size of the decoded data must be no more
 451          * than the encoded data we will read.
 452          */
 453         ogg_bytes_to_read = min(*bytes, OGG_BYTES_CHUNK);
 454         oggbuf = ogg_sync_buffer(&decoder->private_->ogg.sync_state, ogg_bytes_to_read);
 455
 456         if(decoder->private_->read_callback(decoder, oggbuf, &ogg_bytes_to_read, decoder->private_->client_data) != FLAC__STREAM_DECODER_READ_STATUS_CONTINUE) {
 457                 decoder->protected_->state = OggFLAC__STREAM_DECODER_READ_ERROR;
 458                 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
 459         }
 460         ogg_bytes_read = ogg_bytes_to_read;
 461
 462         if(ogg_sync_wrote(&decoder->private_->ogg.sync_state, ogg_bytes_read) < 0) {
 463                 decoder->protected_->state = OggFLAC__STREAM_DECODER_READ_ERROR;
 464                 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
 465         }
 466
 467         *bytes = 0;
 468         while(ogg_sync_pageout(&decoder->private_->ogg.sync_state, &page) == 1) {
 469                 if(ogg_stream_pagein(&decoder->private_->ogg.stream_state, &page) == 0) {
 470                         ogg_packet packet;
 471
 472                         while(ogg_stream_packetout(&decoder->private_->ogg.stream_state, &packet) == 1) {
 473                                 memcpy(buffer, packet.packet, packet.bytes);
 474                                 *bytes += packet.bytes;
 475                                 buffer += packet.bytes;
 476                         }
 477                 } else {
 478                         decoder->protected_->state = OggFLAC__STREAM_DECODER_READ_ERROR;
 479                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
 480                 }
 481         }
 482
 483         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
 484 }
 485
 486 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *unused, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 487 {
 488         OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)client_data;
 489         (void)unused;
 490         return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
 491 }
 492
 493 void metadata_callback_(const FLAC__StreamDecoder *unused, const FLAC__StreamMetadata *metadata, void *client_data)
 494 {
 495         OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)client_data;
 496         (void)unused;
 497         decoder->private_->metadata_callback(decoder, metadata, decoder->private_->client_data);
 498 }
 499
 500 void error_callback_(const FLAC__StreamDecoder *unused, FLAC__StreamDecoderErrorStatus status, void *client_data)
 501 {
 502         OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)client_data;
 503         (void)unused;
 504         decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
 505 }