importer/a52_imp.c

   1 /*****************************************************************************
   2  * a52_imp.c
   3  *****************************************************************************
   4  * Copyright (C) 2011-2014 L-SMASH project
   5  *
   6  * Authors: Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>
   7  *
   8  * Permission to use, copy, modify, and/or distribute this software for any
   9  * purpose with or without fee is hereby granted, provided that the above
  10  * copyright notice and this permission notice appear in all copies.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19  *****************************************************************************/
  20
  21 /* This file is available under an ISC license. */
  22
  23 #include "common/internal.h" /* must be placed first */
  24
  25 #include <string.h>
  26
  27 #define LSMASH_IMPORTER_INTERNAL
  28 #include "importer.h"
  29
  30 /***************************************************************************
  31     AC-3 importer
  32     ETSI TS 102 366 V1.2.1 (2008-08)
  33 ***************************************************************************/
  34 #include "codecs/a52.h"
  35
  36 #define AC3_SAMPLE_DURATION 1536    /* 256 (samples per audio block) * 6 (audio blocks) */
  37
  38 typedef struct
  39 {
  40     ac3_info_t info;
  41     uint64_t   next_frame_pos;
  42     uint8_t   *next_dac3;
  43     uint8_t    buffer[AC3_MAX_SYNCFRAME_LENGTH];
  44     uint32_t   au_number;
  45 } ac3_importer_t;
  46
  47 static void remove_ac3_importer( ac3_importer_t *ac3_imp )
  48 {
  49     if( !ac3_imp )
  50         return;
  51     lsmash_bits_cleanup( ac3_imp->info.bits );
  52     lsmash_free( ac3_imp );
  53 }
  54
  55 static ac3_importer_t *create_ac3_importer( importer_t *importer )
  56 {
  57     ac3_importer_t *ac3_imp = (ac3_importer_t *)lsmash_malloc_zero( sizeof(ac3_importer_t) );
  58     if( !ac3_imp )
  59         return NULL;
  60     ac3_imp->info.bits = lsmash_bits_create( importer->bs );
  61     if( !ac3_imp->info.bits )
  62     {
  63         lsmash_free( ac3_imp );
  64         return NULL;
  65     }
  66     return ac3_imp;
  67 }
  68
  69 static void ac3_importer_cleanup( importer_t *importer )
  70 {
  71     debug_if( importer && importer->info )
  72         remove_ac3_importer( importer->info );
  73 }
  74
  75 static const uint32_t ac3_frame_size_table[19][3] =
  76 {
  77     /*  48,  44.1,    32 */
  78     {  128,   138,   192 },
  79     {  160,   174,   240 },
  80     {  192,   208,   288 },
  81     {  224,   242,   336 },
  82     {  256,   278,   384 },
  83     {  320,   348,   480 },
  84     {  384,   416,   576 },
  85     {  448,   486,   672 },
  86     {  512,   556,   768 },
  87     {  640,   696,   960 },
  88     {  768,   834,  1152 },
  89     {  896,   974,  1344 },
  90     { 1024,  1114,  1536 },
  91     { 1280,  1392,  1920 },
  92     { 1536,  1670,  2304 },
  93     { 1792,  1950,  2688 },
  94     { 2048,  2228,  3072 },
  95     { 2304,  2506,  3456 },
  96     { 2560,  2786,  3840 }
  97 };
  98
  99 static lsmash_audio_summary_t *ac3_create_summary( ac3_info_t *info )
 100 {
 101     lsmash_audio_summary_t *summary = (lsmash_audio_summary_t *)lsmash_create_summary( LSMASH_SUMMARY_TYPE_AUDIO );
 102     if( !summary )
 103         return NULL;
 104     lsmash_ac3_specific_parameters_t *param = &info->dac3_param;
 105     lsmash_codec_specific_t *cs = lsmash_create_codec_specific_data( LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_AC_3,
 106                                                                      LSMASH_CODEC_SPECIFIC_FORMAT_UNSTRUCTURED );
 107     cs->data.unstructured = lsmash_create_ac3_specific_info( &info->dac3_param, &cs->size );
 108     if( !cs->data.unstructured
 109      || lsmash_add_entry( &summary->opaque->list, cs ) < 0 )
 110     {
 111         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 112         lsmash_destroy_codec_specific_data( cs );
 113         return NULL;
 114     }
 115     summary->sample_type      = ISOM_CODEC_TYPE_AC_3_AUDIO;
 116     summary->max_au_length    = AC3_MAX_SYNCFRAME_LENGTH;
 117     summary->aot              = MP4A_AUDIO_OBJECT_TYPE_NULL;    /* no effect */
 118     summary->frequency        = ac3_get_sample_rate( param );
 119     summary->channels         = ac3_get_channel_count( param );
 120     summary->sample_size      = 16;                             /* no effect */
 121     summary->samples_in_frame = AC3_SAMPLE_DURATION;
 122     summary->sbr_mode         = MP4A_AAC_SBR_NOT_SPECIFIED;     /* no effect */
 123     return summary;
 124 }
 125
 126 static int ac3_compare_specific_param( lsmash_ac3_specific_parameters_t *a, lsmash_ac3_specific_parameters_t *b )
 127 {
 128     return (a->fscod             != b->fscod)
 129         || (a->bsid              != b->bsid)
 130         || (a->bsmod             != b->bsmod)
 131         || (a->acmod             != b->acmod)
 132         || (a->lfeon             != b->lfeon)
 133         || ((a->frmsizecod >> 1) != (b->frmsizecod >> 1));
 134 }
 135
 136 static int ac3_buffer_frame( uint8_t *buffer, lsmash_bs_t *bs )
 137 {
 138     uint64_t remain_size = lsmash_bs_get_remaining_buffer_size( bs );
 139     if( remain_size < AC3_MAX_SYNCFRAME_LENGTH )
 140     {
 141         int err = lsmash_bs_read( bs, bs->buffer.max_size );
 142         if( err < 0 )
 143             return err;
 144         remain_size = lsmash_bs_get_remaining_buffer_size( bs );
 145     }
 146     uint64_t copy_size = LSMASH_MIN( remain_size, AC3_MAX_SYNCFRAME_LENGTH );
 147     memcpy( buffer, lsmash_bs_get_buffer_data( bs ), copy_size );
 148     return 0;
 149 }
 150
 151 static int ac3_importer_get_accessunit( importer_t *importer, uint32_t track_number, lsmash_sample_t **p_sample )
 152 {
 153     if( !importer->info )
 154         return LSMASH_ERR_NAMELESS;
 155     if( track_number != 1 )
 156         return LSMASH_ERR_FUNCTION_PARAM;
 157     lsmash_audio_summary_t *summary = (lsmash_audio_summary_t *)lsmash_get_entry_data( importer->summaries, track_number );
 158     if( !summary )
 159         return LSMASH_ERR_NAMELESS;
 160     ac3_importer_t *ac3_imp = (ac3_importer_t *)importer->info;
 161     ac3_info_t     *info    = &ac3_imp->info;
 162     importer_status current_status = importer->status;
 163     if( current_status == IMPORTER_ERROR )
 164         return LSMASH_ERR_NAMELESS;
 165     if( current_status == IMPORTER_EOF )
 166         return IMPORTER_EOF;
 167     lsmash_ac3_specific_parameters_t *param = &info->dac3_param;
 168     uint32_t frame_size = ac3_frame_size_table[ param->frmsizecod >> 1 ][ param->fscod ];
 169     if( param->fscod == 0x1 && param->frmsizecod & 0x1 )
 170         frame_size += 2;
 171     if( current_status == IMPORTER_CHANGE )
 172     {
 173         lsmash_codec_specific_t *cs = isom_get_codec_specific( summary->opaque, LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_AC_3 );
 174         if( cs )
 175         {
 176             cs->destruct( cs->data.unstructured );
 177             cs->data.unstructured = ac3_imp->next_dac3;
 178         }
 179         summary->frequency  = ac3_get_sample_rate( param );
 180         summary->channels   = ac3_get_channel_count( param );
 181         //summary->layout_tag = ac3_channel_layout_table[ param->acmod ][ param->lfeon ];
 182     }
 183     lsmash_sample_t *sample = lsmash_create_sample( frame_size );
 184     if( !sample )
 185         return LSMASH_ERR_MEMORY_ALLOC;
 186     *p_sample = sample;
 187     memcpy( sample->data, ac3_imp->buffer, frame_size );
 188     sample->length                 = frame_size;
 189     sample->dts                    = ac3_imp->au_number++ * summary->samples_in_frame;
 190     sample->cts                    = sample->dts;
 191     sample->prop.ra_flags          = ISOM_SAMPLE_RANDOM_ACCESS_FLAG_SYNC;
 192     sample->prop.pre_roll.distance = 1; /* MDCT */
 193     lsmash_bs_t *bs = info->bits->bs;
 194     ac3_imp->next_frame_pos += frame_size;
 195     lsmash_bs_read_seek( bs, ac3_imp->next_frame_pos, SEEK_SET );
 196     uint8_t syncword[2] =
 197     {
 198         lsmash_bs_show_byte( bs, 0 ),
 199         lsmash_bs_show_byte( bs, 1 )
 200     };
 201     if( bs->eob || (bs->eof && 0 == lsmash_bs_get_remaining_buffer_size( bs )) )
 202         importer->status = IMPORTER_EOF;
 203     else
 204     {
 205         /* Parse the next syncframe header. */
 206         if( syncword[0] != 0x0b
 207          || syncword[1] != 0x77
 208          || ac3_buffer_frame( ac3_imp->buffer, bs ) < 0 )
 209         {
 210             importer->status = IMPORTER_ERROR;
 211             return current_status;
 212         }
 213         lsmash_ac3_specific_parameters_t current_param = info->dac3_param;
 214         ac3_parse_syncframe_header( info );
 215         if( ac3_compare_specific_param( &current_param, &info->dac3_param ) )
 216         {
 217             uint32_t dummy;
 218             uint8_t *dac3 = lsmash_create_ac3_specific_info( &info->dac3_param, &dummy );
 219             if( !dac3 )
 220             {
 221                 importer->status = IMPORTER_ERROR;
 222                 return current_status;
 223             }
 224             ac3_imp->next_dac3 = dac3;
 225             importer->status = IMPORTER_CHANGE;
 226         }
 227         else
 228             importer->status = IMPORTER_OK;
 229     }
 230     return current_status;
 231 }
 232
 233 static int ac3_importer_probe( importer_t *importer )
 234 {
 235     ac3_importer_t *ac3_imp = create_ac3_importer( importer );
 236     if( !ac3_imp )
 237         return LSMASH_ERR_MEMORY_ALLOC;
 238     lsmash_bits_t *bits = ac3_imp->info.bits;
 239     lsmash_bs_t   *bs   = bits->bs;
 240     bs->buffer.max_size = AC3_MAX_SYNCFRAME_LENGTH;
 241     /* Check the syncword and parse the syncframe header */
 242     int err;
 243     if( lsmash_bs_show_byte( bs, 0 ) != 0x0b
 244      || lsmash_bs_show_byte( bs, 1 ) != 0x77 )
 245     {
 246         err = LSMASH_ERR_INVALID_DATA;
 247         goto fail;
 248     }
 249     if( (err = ac3_buffer_frame( ac3_imp->buffer, bs ))      < 0
 250      || (err = ac3_parse_syncframe_header( &ac3_imp->info )) < 0 )
 251         goto fail;
 252     lsmash_audio_summary_t *summary = ac3_create_summary( &ac3_imp->info );
 253     if( !summary )
 254     {
 255         err = LSMASH_ERR_NAMELESS;
 256         goto fail;
 257     }
 258     if( lsmash_add_entry( importer->summaries, summary ) < 0 )
 259     {
 260         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 261         err = LSMASH_ERR_MEMORY_ALLOC;
 262         goto fail;
 263     }
 264     ac3_imp->au_number = 0;
 265     importer->info   = ac3_imp;
 266     importer->status = IMPORTER_OK;
 267     return 0;
 268 fail:
 269     remove_ac3_importer( ac3_imp );
 270     return err;
 271 }
 272
 273 static uint32_t ac3_importer_get_last_delta( importer_t *importer, uint32_t track_number )
 274 {
 275     debug_if( !importer || !importer->info )
 276         return 0;
 277     ac3_importer_t *ac3_imp = (ac3_importer_t *)importer->info;
 278     if( !ac3_imp || track_number != 1 || importer->status != IMPORTER_EOF )
 279         return 0;
 280     return AC3_SAMPLE_DURATION;
 281 }
 282
 283 const importer_functions ac3_importer =
 284 {
 285     { "AC-3" },
 286     1,
 287     ac3_importer_probe,
 288     ac3_importer_get_accessunit,
 289     ac3_importer_get_last_delta,
 290     ac3_importer_cleanup
 291 };
 292
 293 /***************************************************************************
 294     Enhanced AC-3 importer
 295     ETSI TS 102 366 V1.2.1 (2008-08)
 296 ***************************************************************************/
 297 #define EAC3_MIN_SAMPLE_DURATION 256
 298
 299 typedef struct
 300 {
 301     eac3_info_t info;
 302     uint64_t next_frame_pos;
 303     uint32_t next_dec3_length;
 304     uint8_t *next_dec3;
 305     uint8_t  current_fscod2;
 306     uint8_t  buffer[EAC3_MAX_SYNCFRAME_LENGTH];
 307     lsmash_multiple_buffers_t *au_buffers;
 308     uint8_t *au;
 309     uint8_t *incomplete_au;
 310     uint32_t au_length;
 311     uint32_t incomplete_au_length;
 312     uint32_t au_number;
 313     uint32_t syncframe_count_in_au;
 314 } eac3_importer_t;
 315
 316 static void remove_eac3_importer( eac3_importer_t *eac3_imp )
 317 {
 318     if( !eac3_imp )
 319         return;
 320     lsmash_destroy_multiple_buffers( eac3_imp->au_buffers );
 321     lsmash_bits_cleanup( eac3_imp->info.bits );
 322     lsmash_free( eac3_imp );
 323 }
 324
 325 static eac3_importer_t *create_eac3_importer( importer_t *importer )
 326 {
 327     eac3_importer_t *eac3_imp = (eac3_importer_t *)lsmash_malloc_zero( sizeof(eac3_importer_t) );
 328     if( !eac3_imp )
 329         return NULL;
 330     eac3_info_t *info = &eac3_imp->info;
 331     info->bits = lsmash_bits_create( importer->bs );
 332     if( !info->bits )
 333     {
 334         lsmash_free( eac3_imp );
 335         return NULL;
 336     }
 337     eac3_imp->au_buffers = lsmash_create_multiple_buffers( 2, EAC3_MAX_SYNCFRAME_LENGTH );
 338     if( !eac3_imp->au_buffers )
 339     {
 340         lsmash_bits_cleanup( info->bits );
 341         lsmash_free( eac3_imp );
 342         return NULL;
 343     }
 344     eac3_imp->au            = lsmash_withdraw_buffer( eac3_imp->au_buffers, 1 );
 345     eac3_imp->incomplete_au = lsmash_withdraw_buffer( eac3_imp->au_buffers, 2 );
 346     return eac3_imp;
 347 }
 348
 349 static void eac3_importer_cleanup( importer_t *importer )
 350 {
 351     debug_if( importer && importer->info )
 352         remove_eac3_importer( importer->info );
 353 }
 354
 355 static int eac3_importer_get_next_accessunit_internal( importer_t *importer )
 356 {
 357     int au_completed = 0;
 358     eac3_importer_t *eac3_imp = (eac3_importer_t *)importer->info;
 359     eac3_info_t     *info     = &eac3_imp->info;
 360     lsmash_bs_t     *bs       = info->bits->bs;
 361     while( !au_completed )
 362     {
 363         /* Read data from the stream if needed. */
 364         eac3_imp->next_frame_pos += info->frame_size;
 365         lsmash_bs_read_seek( bs, eac3_imp->next_frame_pos, SEEK_SET );
 366         uint64_t remain_size = lsmash_bs_get_remaining_buffer_size( bs );
 367         if( remain_size < EAC3_MAX_SYNCFRAME_LENGTH )
 368         {
 369             int err = lsmash_bs_read( bs, bs->buffer.max_size );
 370             if( err < 0 )
 371             {
 372                 lsmash_log( importer, LSMASH_LOG_ERROR, "failed to read data from the stream.\n" );
 373                 return err;
 374             }
 375             remain_size = lsmash_bs_get_remaining_buffer_size( bs );
 376         }
 377         uint64_t copy_size = LSMASH_MIN( remain_size, EAC3_MAX_SYNCFRAME_LENGTH );
 378         memcpy( eac3_imp->buffer, lsmash_bs_get_buffer_data( bs ), copy_size );
 379         /* Check the remainder length of the buffer.
 380          * If there is enough length, then parse the syncframe in it.
 381          * The length 5 is the required byte length to get frame size. */
 382         if( bs->eob || (bs->eof && remain_size < 5) )
 383         {
 384             /* Reached the end of stream.
 385              * According to ETSI TS 102 366 V1.2.1 (2008-08),
 386              * one access unit consists of 6 audio blocks and begins with independent substream 0.
 387              * The specification doesn't mention the case where a enhanced AC-3 stream ends at non-mod6 audio blocks.
 388              * At the end of the stream, therefore, we might make an access unit which has less than 6 audio blocks anyway. */
 389             importer->status = IMPORTER_EOF;
 390             au_completed = !!eac3_imp->incomplete_au_length;
 391             if( !au_completed )
 392             {
 393                 /* No more access units in the stream. */
 394                 if( lsmash_bs_get_remaining_buffer_size( bs ) )
 395                 {
 396                     lsmash_log( importer, LSMASH_LOG_WARNING, "the stream is truncated at the end.\n" );
 397                     return LSMASH_ERR_INVALID_DATA;
 398                 }
 399                 return 0;
 400             }
 401             if( !info->dec3_param_initialized )
 402                 eac3_update_specific_param( info );
 403         }
 404         else
 405         {
 406             /* Check the syncword. */
 407             if( lsmash_bs_show_byte( bs, 0 ) != 0x0b
 408              || lsmash_bs_show_byte( bs, 1 ) != 0x77 )
 409             {
 410                 lsmash_log( importer, LSMASH_LOG_ERROR, "a syncword is not found.\n" );
 411                 return LSMASH_ERR_INVALID_DATA;
 412             }
 413             /* Parse syncframe. */
 414             info->frame_size = 0;
 415             int err = eac3_parse_syncframe( info );
 416             if( err < 0 )
 417             {
 418                 lsmash_log( importer, LSMASH_LOG_ERROR, "failed to parse syncframe.\n" );
 419                 return err;
 420             }
 421             if( remain_size < info->frame_size )
 422             {
 423                 lsmash_log( importer, LSMASH_LOG_ERROR, "a frame is truncated.\n" );
 424                 return LSMASH_ERR_INVALID_DATA;
 425             }
 426             int independent = info->strmtyp != 0x1;
 427             if( independent && info->substreamid == 0x0 )
 428             {
 429                 if( info->number_of_audio_blocks == 6 )
 430                 {
 431                     /* Encountered the first syncframe of the next access unit. */
 432                     info->number_of_audio_blocks = 0;
 433                     au_completed = 1;
 434                 }
 435                 else if( info->number_of_audio_blocks > 6 )
 436                 {
 437                     lsmash_log( importer, LSMASH_LOG_ERROR, "greater than 6 consecutive independent substreams.\n" );
 438                     return LSMASH_ERR_INVALID_DATA;
 439                 }
 440                 info->number_of_audio_blocks += eac3_audio_block_table[ info->numblkscod ];
 441                 info->number_of_independent_substreams = 0;
 442                 eac3_imp->current_fscod2 = info->fscod2;
 443             }
 444             else if( info->syncframe_count == 0 )
 445             {
 446                 /* The first syncframe in an AU must be independent and assigned substream ID 0. */
 447                 lsmash_log( importer, LSMASH_LOG_ERROR, "the first syncframe is NOT an independent substream.\n" );
 448                 return LSMASH_ERR_INVALID_DATA;
 449             }
 450             if( independent )
 451                 info->independent_info[info->number_of_independent_substreams ++].num_dep_sub = 0;
 452             else
 453                 ++ info->independent_info[info->number_of_independent_substreams - 1].num_dep_sub;
 454         }
 455         if( au_completed )
 456         {
 457             memcpy( eac3_imp->au, eac3_imp->incomplete_au, eac3_imp->incomplete_au_length );
 458             eac3_imp->au_length             = eac3_imp->incomplete_au_length;
 459             eac3_imp->incomplete_au_length  = 0;
 460             eac3_imp->syncframe_count_in_au = info->syncframe_count;
 461             info->syncframe_count = 0;
 462             if( importer->status == IMPORTER_EOF )
 463                 break;
 464         }
 465         /* Increase buffer size to store AU if short. */
 466         if( eac3_imp->incomplete_au_length + info->frame_size > eac3_imp->au_buffers->buffer_size )
 467         {
 468             lsmash_multiple_buffers_t *temp = lsmash_resize_multiple_buffers( eac3_imp->au_buffers,
 469                                                                               eac3_imp->au_buffers->buffer_size + EAC3_MAX_SYNCFRAME_LENGTH );
 470             if( !temp )
 471                 return LSMASH_ERR_MEMORY_ALLOC;
 472             eac3_imp->au_buffers    = temp;
 473             eac3_imp->au            = lsmash_withdraw_buffer( eac3_imp->au_buffers, 1 );
 474             eac3_imp->incomplete_au = lsmash_withdraw_buffer( eac3_imp->au_buffers, 2 );
 475         }
 476         /* Append syncframe data. */
 477         memcpy( eac3_imp->incomplete_au + eac3_imp->incomplete_au_length, eac3_imp->buffer, info->frame_size );
 478         eac3_imp->incomplete_au_length += info->frame_size;
 479         ++ info->syncframe_count;
 480     }
 481     return bs->error ? LSMASH_ERR_NAMELESS : 0;
 482 }
 483
 484 static int eac3_importer_get_accessunit( importer_t *importer, uint32_t track_number, lsmash_sample_t **p_sample )
 485 {
 486     if( !importer->info )
 487         return LSMASH_ERR_NAMELESS;
 488     if( track_number != 1 )
 489         return LSMASH_ERR_FUNCTION_PARAM;
 490     lsmash_audio_summary_t *summary = (lsmash_audio_summary_t *)lsmash_get_entry_data( importer->summaries, track_number );
 491     if( !summary )
 492         return LSMASH_ERR_NAMELESS;
 493     eac3_importer_t *eac3_imp = (eac3_importer_t *)importer->info;
 494     eac3_info_t     *info     = &eac3_imp->info;
 495     importer_status current_status = importer->status;
 496     if( current_status == IMPORTER_ERROR )
 497         return LSMASH_ERR_NAMELESS;
 498     if( current_status == IMPORTER_EOF && eac3_imp->au_length == 0 )
 499         return IMPORTER_EOF;
 500     if( current_status == IMPORTER_CHANGE )
 501     {
 502         lsmash_codec_specific_t *cs = isom_get_codec_specific( summary->opaque, LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_EC_3 );
 503         if( cs )
 504         {
 505             cs->destruct( cs->data.unstructured );
 506             cs->data.unstructured = eac3_imp->next_dec3;
 507             cs->size              = eac3_imp->next_dec3_length;
 508         }
 509         summary->max_au_length = eac3_imp->syncframe_count_in_au * EAC3_MAX_SYNCFRAME_LENGTH;
 510         eac3_update_sample_rate( &summary->frequency, &info->dec3_param, &eac3_imp->current_fscod2 );
 511         eac3_update_channel_count( &summary->channels, &info->dec3_param );
 512     }
 513     lsmash_sample_t *sample = lsmash_create_sample( eac3_imp->au_length );
 514     if( !sample )
 515         return LSMASH_ERR_MEMORY_ALLOC;
 516     *p_sample = sample;
 517     memcpy( sample->data, eac3_imp->au, eac3_imp->au_length );
 518     sample->length                 = eac3_imp->au_length;
 519     sample->dts                    = eac3_imp->au_number++ * summary->samples_in_frame;
 520     sample->cts                    = sample->dts;
 521     sample->prop.ra_flags          = ISOM_SAMPLE_RANDOM_ACCESS_FLAG_SYNC;
 522     sample->prop.pre_roll.distance = 1; /* MDCT */
 523     if( importer->status == IMPORTER_EOF )
 524     {
 525         eac3_imp->au_length = 0;
 526         return 0;
 527     }
 528     uint32_t old_syncframe_count_in_au = eac3_imp->syncframe_count_in_au;
 529     if( eac3_importer_get_next_accessunit_internal( importer ) < 0 )
 530     {
 531         importer->status = IMPORTER_ERROR;
 532         return current_status;
 533     }
 534     if( eac3_imp->syncframe_count_in_au )
 535     {
 536         /* Check sample description change. */
 537         uint32_t new_length;
 538         uint8_t *dec3 = lsmash_create_eac3_specific_info( &info->dec3_param, &new_length );
 539         if( !dec3 )
 540         {
 541             importer->status = IMPORTER_ERROR;
 542             return current_status;
 543         }
 544         lsmash_codec_specific_t *cs = isom_get_codec_specific( summary->opaque, LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_EC_3 );
 545         if( (eac3_imp->syncframe_count_in_au > old_syncframe_count_in_au)
 546          || (cs && (new_length != cs->size || memcmp( dec3, cs->data.unstructured, cs->size ))) )
 547         {
 548             importer->status = IMPORTER_CHANGE;
 549             eac3_imp->next_dec3        = dec3;
 550             eac3_imp->next_dec3_length = new_length;
 551         }
 552         else
 553         {
 554             if( importer->status != IMPORTER_EOF )
 555                 importer->status = IMPORTER_OK;
 556             lsmash_free( dec3 );
 557         }
 558     }
 559     return current_status;
 560 }
 561
 562 static lsmash_audio_summary_t *eac3_create_summary( eac3_importer_t *eac3_imp )
 563 {
 564     lsmash_audio_summary_t *summary = (lsmash_audio_summary_t *)lsmash_create_summary( LSMASH_SUMMARY_TYPE_AUDIO );
 565     if( !summary )
 566         return NULL;
 567     eac3_info_t *info = &eac3_imp->info;
 568     lsmash_codec_specific_t *cs = lsmash_create_codec_specific_data( LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_EC_3,
 569                                                                      LSMASH_CODEC_SPECIFIC_FORMAT_UNSTRUCTURED );
 570     cs->data.unstructured = lsmash_create_eac3_specific_info( &info->dec3_param, &cs->size );
 571     if( !cs->data.unstructured
 572      || lsmash_add_entry( &summary->opaque->list, cs ) < 0 )
 573     {
 574         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 575         lsmash_destroy_codec_specific_data( cs );
 576         return NULL;
 577     }
 578     summary->sample_type      = ISOM_CODEC_TYPE_EC_3_AUDIO;
 579     summary->max_au_length    = eac3_imp->syncframe_count_in_au * EAC3_MAX_SYNCFRAME_LENGTH;
 580     summary->aot              = MP4A_AUDIO_OBJECT_TYPE_NULL;    /* no effect */
 581     summary->sample_size      = 16;                             /* no effect */
 582     summary->samples_in_frame = EAC3_MIN_SAMPLE_DURATION * 6;   /* 256 (samples per audio block) * 6 (audio blocks) */
 583     summary->sbr_mode         = MP4A_AAC_SBR_NOT_SPECIFIED;     /* no effect */
 584     eac3_update_sample_rate( &summary->frequency, &info->dec3_param, &eac3_imp->current_fscod2 );
 585     eac3_update_channel_count( &summary->channels, &info->dec3_param );
 586     return summary;
 587 }
 588
 589 static int eac3_importer_probe( importer_t *importer )
 590 {
 591     eac3_importer_t *eac3_imp = create_eac3_importer( importer );
 592     if( !eac3_imp )
 593         return LSMASH_ERR_MEMORY_ALLOC;
 594     lsmash_bits_t *bits = eac3_imp->info.bits;
 595     lsmash_bs_t   *bs   = bits->bs;
 596     bs->buffer.max_size = EAC3_MAX_SYNCFRAME_LENGTH;
 597     importer->info = eac3_imp;
 598     int err = eac3_importer_get_next_accessunit_internal( importer );
 599     if( err < 0 )
 600         goto fail;
 601     lsmash_audio_summary_t *summary = eac3_create_summary( eac3_imp );
 602     if( !summary )
 603     {
 604         err = LSMASH_ERR_NAMELESS;
 605         goto fail;
 606     }
 607     if( importer->status != IMPORTER_EOF )
 608         importer->status = IMPORTER_OK;
 609     eac3_imp->au_number = 0;
 610     if( lsmash_add_entry( importer->summaries, summary ) < 0 )
 611     {
 612         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 613         err = LSMASH_ERR_MEMORY_ALLOC;
 614         goto fail;
 615     }
 616     return 0;
 617 fail:
 618     remove_eac3_importer( eac3_imp );
 619     importer->info      = NULL;
 620     return err;
 621 }
 622
 623 static uint32_t eac3_importer_get_last_delta( importer_t *importer, uint32_t track_number )
 624 {
 625     debug_if( !importer || !importer->info )
 626         return 0;
 627     eac3_importer_t *eac3_imp = (eac3_importer_t *)importer->info;
 628     if( !eac3_imp || track_number != 1 || importer->status != IMPORTER_EOF || eac3_imp->au_length )
 629         return 0;
 630     return EAC3_MIN_SAMPLE_DURATION * eac3_imp->info.number_of_audio_blocks;
 631 }
 632
 633 const importer_functions eac3_importer =
 634 {
 635     { "Enhanced AC-3", offsetof( importer_t, log_level ) },
 636     1,
 637     eac3_importer_probe,
 638     eac3_importer_get_accessunit,
 639     eac3_importer_get_last_delta,
 640     eac3_importer_cleanup
 641 };