importer/a52_imp.c

   1 /*****************************************************************************
   2  * a52_imp.c
   3  *****************************************************************************
   4  * Copyright (C) 2011-2017 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     if( !cs )
 108     {
 109         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 110         return NULL;
 111     }
 112     cs->data.unstructured = lsmash_create_ac3_specific_info( &info->dac3_param, &cs->size );
 113     if( !cs->data.unstructured
 114      || lsmash_list_add_entry( &summary->opaque->list, cs ) < 0 )
 115     {
 116         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 117         lsmash_destroy_codec_specific_data( cs );
 118         return NULL;
 119     }
 120     summary->sample_type      = ISOM_CODEC_TYPE_AC_3_AUDIO;
 121     summary->max_au_length    = AC3_MAX_SYNCFRAME_LENGTH;
 122     summary->aot              = MP4A_AUDIO_OBJECT_TYPE_NULL;    /* no effect */
 123     summary->frequency        = ac3_get_sample_rate( param );
 124     summary->channels         = ac3_get_channel_count( param );
 125     summary->sample_size      = 16;                             /* no effect */
 126     summary->samples_in_frame = AC3_SAMPLE_DURATION;
 127     summary->sbr_mode         = MP4A_AAC_SBR_NOT_SPECIFIED;     /* no effect */
 128     return summary;
 129 }
 130
 131 static int ac3_compare_specific_param( lsmash_ac3_specific_parameters_t *a, lsmash_ac3_specific_parameters_t *b )
 132 {
 133     return (a->fscod             != b->fscod)
 134         || (a->bsid              != b->bsid)
 135         || (a->bsmod             != b->bsmod)
 136         || (a->acmod             != b->acmod)
 137         || (a->lfeon             != b->lfeon)
 138         || ((a->frmsizecod >> 1) != (b->frmsizecod >> 1));
 139 }
 140
 141 static int ac3_buffer_frame( uint8_t *buffer, lsmash_bs_t *bs )
 142 {
 143     uint64_t remain_size = lsmash_bs_get_remaining_buffer_size( bs );
 144     if( remain_size < AC3_MAX_SYNCFRAME_LENGTH )
 145     {
 146         int err = lsmash_bs_read( bs, bs->buffer.max_size );
 147         if( err < 0 )
 148             return err;
 149         remain_size = lsmash_bs_get_remaining_buffer_size( bs );
 150     }
 151     uint64_t copy_size = LSMASH_MIN( remain_size, AC3_MAX_SYNCFRAME_LENGTH );
 152     memcpy( buffer, lsmash_bs_get_buffer_data( bs ), copy_size );
 153     return 0;
 154 }
 155
 156 static int ac3_importer_get_accessunit( importer_t *importer, uint32_t track_number, lsmash_sample_t **p_sample )
 157 {
 158     if( !importer->info )
 159         return LSMASH_ERR_NAMELESS;
 160     if( track_number != 1 )
 161         return LSMASH_ERR_FUNCTION_PARAM;
 162     lsmash_audio_summary_t *summary = (lsmash_audio_summary_t *)lsmash_list_get_entry_data( importer->summaries, track_number );
 163     if( !summary )
 164         return LSMASH_ERR_NAMELESS;
 165     ac3_importer_t *ac3_imp = (ac3_importer_t *)importer->info;
 166     ac3_info_t     *info    = &ac3_imp->info;
 167     importer_status current_status = importer->status;
 168     if( current_status == IMPORTER_ERROR )
 169         return LSMASH_ERR_NAMELESS;
 170     if( current_status == IMPORTER_EOF )
 171         return IMPORTER_EOF;
 172     lsmash_ac3_specific_parameters_t *param = &info->dac3_param;
 173     uint32_t frame_size = ac3_frame_size_table[ param->frmsizecod >> 1 ][ param->fscod ];
 174     if( param->fscod == 0x1 && param->frmsizecod & 0x1 )
 175         frame_size += 2;
 176     if( current_status == IMPORTER_CHANGE )
 177     {
 178         lsmash_codec_specific_t *cs = isom_get_codec_specific( summary->opaque, LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_AC_3 );
 179         if( cs )
 180         {
 181             cs->destruct( cs->data.unstructured );
 182             cs->data.unstructured = ac3_imp->next_dac3;
 183         }
 184         summary->frequency  = ac3_get_sample_rate( param );
 185         summary->channels   = ac3_get_channel_count( param );
 186         //summary->layout_tag = ac3_channel_layout_table[ param->acmod ][ param->lfeon ];
 187     }
 188     lsmash_sample_t *sample = lsmash_create_sample( frame_size );
 189     if( !sample )
 190         return LSMASH_ERR_MEMORY_ALLOC;
 191     *p_sample = sample;
 192     memcpy( sample->data, ac3_imp->buffer, frame_size );
 193     sample->length                 = frame_size;
 194     sample->dts                    = ac3_imp->au_number++ * summary->samples_in_frame;
 195     sample->cts                    = sample->dts;
 196     sample->prop.ra_flags          = ISOM_SAMPLE_RANDOM_ACCESS_FLAG_SYNC;
 197     sample->prop.pre_roll.distance = 1; /* MDCT */
 198     lsmash_bs_t *bs = info->bits->bs;
 199     ac3_imp->next_frame_pos += frame_size;
 200     lsmash_bs_read_seek( bs, ac3_imp->next_frame_pos, SEEK_SET );
 201     uint8_t syncword[2] =
 202     {
 203         lsmash_bs_show_byte( bs, 0 ),
 204         lsmash_bs_show_byte( bs, 1 )
 205     };
 206     if( bs->eob || (bs->eof && 0 == lsmash_bs_get_remaining_buffer_size( bs )) )
 207         importer->status = IMPORTER_EOF;
 208     else
 209     {
 210         /* Parse the next syncframe header. */
 211         if( syncword[0] != 0x0b
 212          || syncword[1] != 0x77
 213          || ac3_buffer_frame( ac3_imp->buffer, bs ) < 0 )
 214         {
 215             importer->status = IMPORTER_ERROR;
 216             return current_status;
 217         }
 218         lsmash_ac3_specific_parameters_t current_param = info->dac3_param;
 219         ac3_parse_syncframe_header( info );
 220         if( ac3_compare_specific_param( &current_param, &info->dac3_param ) )
 221         {
 222             uint32_t dummy;
 223             uint8_t *dac3 = lsmash_create_ac3_specific_info( &info->dac3_param, &dummy );
 224             if( !dac3 )
 225             {
 226                 importer->status = IMPORTER_ERROR;
 227                 return current_status;
 228             }
 229             ac3_imp->next_dac3 = dac3;
 230             importer->status = IMPORTER_CHANGE;
 231         }
 232         else
 233             importer->status = IMPORTER_OK;
 234     }
 235     return current_status;
 236 }
 237
 238 static int ac3_importer_probe( importer_t *importer )
 239 {
 240     ac3_importer_t *ac3_imp = create_ac3_importer( importer );
 241     if( !ac3_imp )
 242         return LSMASH_ERR_MEMORY_ALLOC;
 243     lsmash_bits_t *bits = ac3_imp->info.bits;
 244     lsmash_bs_t   *bs   = bits->bs;
 245     bs->buffer.max_size = AC3_MAX_SYNCFRAME_LENGTH;
 246     /* Check the syncword and parse the syncframe header */
 247     int err;
 248     if( lsmash_bs_show_byte( bs, 0 ) != 0x0b
 249      || lsmash_bs_show_byte( bs, 1 ) != 0x77 )
 250     {
 251         err = LSMASH_ERR_INVALID_DATA;
 252         goto fail;
 253     }
 254     if( (err = ac3_buffer_frame( ac3_imp->buffer, bs ))      < 0
 255      || (err = ac3_parse_syncframe_header( &ac3_imp->info )) < 0 )
 256         goto fail;
 257     lsmash_audio_summary_t *summary = ac3_create_summary( &ac3_imp->info );
 258     if( !summary )
 259     {
 260         err = LSMASH_ERR_NAMELESS;
 261         goto fail;
 262     }
 263     if( lsmash_list_add_entry( importer->summaries, summary ) < 0 )
 264     {
 265         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 266         err = LSMASH_ERR_MEMORY_ALLOC;
 267         goto fail;
 268     }
 269     ac3_imp->au_number = 0;
 270     importer->info   = ac3_imp;
 271     importer->status = IMPORTER_OK;
 272     return 0;
 273 fail:
 274     remove_ac3_importer( ac3_imp );
 275     return err;
 276 }
 277
 278 static uint32_t ac3_importer_get_last_delta( importer_t *importer, uint32_t track_number )
 279 {
 280     debug_if( !importer || !importer->info )
 281         return 0;
 282     ac3_importer_t *ac3_imp = (ac3_importer_t *)importer->info;
 283     if( !ac3_imp || track_number != 1 || importer->status != IMPORTER_EOF )
 284         return 0;
 285     return AC3_SAMPLE_DURATION;
 286 }
 287
 288 const importer_functions ac3_importer =
 289 {
 290     { "AC-3" },
 291     1,
 292     ac3_importer_probe,
 293     ac3_importer_get_accessunit,
 294     ac3_importer_get_last_delta,
 295     ac3_importer_cleanup
 296 };
 297
 298 /***************************************************************************
 299     Enhanced AC-3 importer
 300     ETSI TS 102 366 V1.2.1 (2008-08)
 301 ***************************************************************************/
 302 #define EAC3_MIN_SAMPLE_DURATION 256
 303
 304 typedef struct
 305 {
 306     eac3_info_t info;
 307     uint64_t next_frame_pos;
 308     uint32_t next_dec3_length;
 309     uint8_t *next_dec3;
 310     uint8_t  current_fscod2;
 311     uint8_t  buffer[EAC3_MAX_SYNCFRAME_LENGTH];
 312     lsmash_multiple_buffers_t *au_buffers;
 313     uint8_t *au;
 314     uint8_t *incomplete_au;
 315     uint32_t au_length;
 316     uint32_t incomplete_au_length;
 317     uint32_t au_number;
 318     uint32_t syncframe_count_in_au;
 319 } eac3_importer_t;
 320
 321 static void remove_eac3_importer( eac3_importer_t *eac3_imp )
 322 {
 323     if( !eac3_imp )
 324         return;
 325     lsmash_destroy_multiple_buffers( eac3_imp->au_buffers );
 326     lsmash_bits_cleanup( eac3_imp->info.bits );
 327     lsmash_free( eac3_imp );
 328 }
 329
 330 static eac3_importer_t *create_eac3_importer( importer_t *importer )
 331 {
 332     eac3_importer_t *eac3_imp = (eac3_importer_t *)lsmash_malloc_zero( sizeof(eac3_importer_t) );
 333     if( !eac3_imp )
 334         return NULL;
 335     eac3_info_t *info = &eac3_imp->info;
 336     info->bits = lsmash_bits_create( importer->bs );
 337     if( !info->bits )
 338     {
 339         lsmash_free( eac3_imp );
 340         return NULL;
 341     }
 342     eac3_imp->au_buffers = lsmash_create_multiple_buffers( 2, EAC3_MAX_SYNCFRAME_LENGTH );
 343     if( !eac3_imp->au_buffers )
 344     {
 345         lsmash_bits_cleanup( info->bits );
 346         lsmash_free( eac3_imp );
 347         return NULL;
 348     }
 349     eac3_imp->au            = lsmash_withdraw_buffer( eac3_imp->au_buffers, 1 );
 350     eac3_imp->incomplete_au = lsmash_withdraw_buffer( eac3_imp->au_buffers, 2 );
 351     return eac3_imp;
 352 }
 353
 354 static void eac3_importer_cleanup( importer_t *importer )
 355 {
 356     debug_if( importer && importer->info )
 357         remove_eac3_importer( importer->info );
 358 }
 359
 360 static int eac3_importer_get_next_accessunit_internal( importer_t *importer )
 361 {
 362     int au_completed = 0;
 363     eac3_importer_t *eac3_imp = (eac3_importer_t *)importer->info;
 364     eac3_info_t     *info     = &eac3_imp->info;
 365     lsmash_bs_t     *bs       = info->bits->bs;
 366     while( !au_completed )
 367     {
 368         /* Read data from the stream if needed. */
 369         eac3_imp->next_frame_pos += info->frame_size;
 370         lsmash_bs_read_seek( bs, eac3_imp->next_frame_pos, SEEK_SET );
 371         uint64_t remain_size = lsmash_bs_get_remaining_buffer_size( bs );
 372         if( remain_size < EAC3_MAX_SYNCFRAME_LENGTH )
 373         {
 374             int err = lsmash_bs_read( bs, bs->buffer.max_size );
 375             if( err < 0 )
 376             {
 377                 lsmash_log( importer, LSMASH_LOG_ERROR, "failed to read data from the stream.\n" );
 378                 return err;
 379             }
 380             remain_size = lsmash_bs_get_remaining_buffer_size( bs );
 381         }
 382         uint64_t copy_size = LSMASH_MIN( remain_size, EAC3_MAX_SYNCFRAME_LENGTH );
 383         memcpy( eac3_imp->buffer, lsmash_bs_get_buffer_data( bs ), copy_size );
 384         /* Check the remainder length of the buffer.
 385          * If there is enough length, then parse the syncframe in it.
 386          * The length 5 is the required byte length to get frame size. */
 387         if( bs->eob || (bs->eof && remain_size < 5) )
 388         {
 389             /* Reached the end of stream.
 390              * According to ETSI TS 102 366 V1.2.1 (2008-08),
 391              * one access unit consists of 6 audio blocks and begins with independent substream 0.
 392              * The specification doesn't mention the case where a enhanced AC-3 stream ends at non-mod6 audio blocks.
 393              * At the end of the stream, therefore, we might make an access unit which has less than 6 audio blocks anyway. */
 394             importer->status = IMPORTER_EOF;
 395             au_completed = !!eac3_imp->incomplete_au_length;
 396             if( !au_completed )
 397             {
 398                 /* No more access units in the stream. */
 399                 if( lsmash_bs_get_remaining_buffer_size( bs ) )
 400                 {
 401                     lsmash_log( importer, LSMASH_LOG_WARNING, "the stream is truncated at the end.\n" );
 402                     return LSMASH_ERR_INVALID_DATA;
 403                 }
 404                 return 0;
 405             }
 406             if( !info->dec3_param_initialized )
 407                 eac3_update_specific_param( info );
 408         }
 409         else
 410         {
 411             /* Check the syncword. */
 412             if( lsmash_bs_show_byte( bs, 0 ) != 0x0b
 413              || lsmash_bs_show_byte( bs, 1 ) != 0x77 )
 414             {
 415                 lsmash_log( importer, LSMASH_LOG_ERROR, "a syncword is not found.\n" );
 416                 return LSMASH_ERR_INVALID_DATA;
 417             }
 418             /* Parse syncframe. */
 419             info->frame_size = 0;
 420             int err = eac3_parse_syncframe( info );
 421             if( err < 0 )
 422             {
 423                 lsmash_log( importer, LSMASH_LOG_ERROR, "failed to parse syncframe.\n" );
 424                 return err;
 425             }
 426             if( remain_size < info->frame_size )
 427             {
 428                 lsmash_log( importer, LSMASH_LOG_ERROR, "a frame is truncated.\n" );
 429                 return LSMASH_ERR_INVALID_DATA;
 430             }
 431             int independent = info->strmtyp != 0x1;
 432             if( independent && info->substreamid == 0x0 )
 433             {
 434                 if( info->number_of_audio_blocks == 6 )
 435                 {
 436                     /* Encountered the first syncframe of the next access unit. */
 437                     info->number_of_audio_blocks = 0;
 438                     au_completed = 1;
 439                 }
 440                 else if( info->number_of_audio_blocks > 6 )
 441                 {
 442                     lsmash_log( importer, LSMASH_LOG_ERROR, "greater than 6 consecutive independent substreams.\n" );
 443                     return LSMASH_ERR_INVALID_DATA;
 444                 }
 445                 info->number_of_audio_blocks += eac3_audio_block_table[ info->numblkscod ];
 446                 info->number_of_independent_substreams = 0;
 447                 eac3_imp->current_fscod2 = info->fscod2;
 448             }
 449             else if( info->syncframe_count == 0 )
 450             {
 451                 /* The first syncframe in an AU must be independent and assigned substream ID 0. */
 452                 lsmash_log( importer, LSMASH_LOG_ERROR, "the first syncframe is NOT an independent substream.\n" );
 453                 return LSMASH_ERR_INVALID_DATA;
 454             }
 455             if( independent )
 456                 info->independent_info[info->number_of_independent_substreams ++].num_dep_sub = 0;
 457             else
 458                 ++ info->independent_info[info->number_of_independent_substreams - 1].num_dep_sub;
 459         }
 460         if( au_completed )
 461         {
 462             memcpy( eac3_imp->au, eac3_imp->incomplete_au, eac3_imp->incomplete_au_length );
 463             eac3_imp->au_length             = eac3_imp->incomplete_au_length;
 464             eac3_imp->incomplete_au_length  = 0;
 465             eac3_imp->syncframe_count_in_au = info->syncframe_count;
 466             info->syncframe_count = 0;
 467             if( importer->status == IMPORTER_EOF )
 468                 break;
 469         }
 470         /* Increase buffer size to store AU if short. */
 471         if( eac3_imp->incomplete_au_length + info->frame_size > eac3_imp->au_buffers->buffer_size )
 472         {
 473             lsmash_multiple_buffers_t *temp = lsmash_resize_multiple_buffers( eac3_imp->au_buffers,
 474                                                                               eac3_imp->au_buffers->buffer_size + EAC3_MAX_SYNCFRAME_LENGTH );
 475             if( !temp )
 476                 return LSMASH_ERR_MEMORY_ALLOC;
 477             eac3_imp->au_buffers    = temp;
 478             eac3_imp->au            = lsmash_withdraw_buffer( eac3_imp->au_buffers, 1 );
 479             eac3_imp->incomplete_au = lsmash_withdraw_buffer( eac3_imp->au_buffers, 2 );
 480         }
 481         /* Append syncframe data. */
 482         memcpy( eac3_imp->incomplete_au + eac3_imp->incomplete_au_length, eac3_imp->buffer, info->frame_size );
 483         eac3_imp->incomplete_au_length += info->frame_size;
 484         ++ info->syncframe_count;
 485     }
 486     return bs->error ? LSMASH_ERR_NAMELESS : 0;
 487 }
 488
 489 static int eac3_importer_get_accessunit( importer_t *importer, uint32_t track_number, lsmash_sample_t **p_sample )
 490 {
 491     if( !importer->info )
 492         return LSMASH_ERR_NAMELESS;
 493     if( track_number != 1 )
 494         return LSMASH_ERR_FUNCTION_PARAM;
 495     lsmash_audio_summary_t *summary = (lsmash_audio_summary_t *)lsmash_list_get_entry_data( importer->summaries, track_number );
 496     if( !summary )
 497         return LSMASH_ERR_NAMELESS;
 498     eac3_importer_t *eac3_imp = (eac3_importer_t *)importer->info;
 499     eac3_info_t     *info     = &eac3_imp->info;
 500     importer_status current_status = importer->status;
 501     if( current_status == IMPORTER_ERROR )
 502         return LSMASH_ERR_NAMELESS;
 503     if( current_status == IMPORTER_EOF && eac3_imp->au_length == 0 )
 504         return IMPORTER_EOF;
 505     if( current_status == IMPORTER_CHANGE )
 506     {
 507         lsmash_codec_specific_t *cs = isom_get_codec_specific( summary->opaque, LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_EC_3 );
 508         if( cs )
 509         {
 510             cs->destruct( cs->data.unstructured );
 511             cs->data.unstructured = eac3_imp->next_dec3;
 512             cs->size              = eac3_imp->next_dec3_length;
 513         }
 514         summary->max_au_length = eac3_imp->syncframe_count_in_au * EAC3_MAX_SYNCFRAME_LENGTH;
 515         eac3_update_sample_rate( &summary->frequency, &info->dec3_param, &eac3_imp->current_fscod2 );
 516         eac3_update_channel_count( &summary->channels, &info->dec3_param );
 517     }
 518     lsmash_sample_t *sample = lsmash_create_sample( eac3_imp->au_length );
 519     if( !sample )
 520         return LSMASH_ERR_MEMORY_ALLOC;
 521     *p_sample = sample;
 522     memcpy( sample->data, eac3_imp->au, eac3_imp->au_length );
 523     sample->length                 = eac3_imp->au_length;
 524     sample->dts                    = eac3_imp->au_number++ * summary->samples_in_frame;
 525     sample->cts                    = sample->dts;
 526     sample->prop.ra_flags          = ISOM_SAMPLE_RANDOM_ACCESS_FLAG_SYNC;
 527     sample->prop.pre_roll.distance = 1; /* MDCT */
 528     if( importer->status == IMPORTER_EOF )
 529     {
 530         eac3_imp->au_length = 0;
 531         return 0;
 532     }
 533     uint32_t old_syncframe_count_in_au = eac3_imp->syncframe_count_in_au;
 534     if( eac3_importer_get_next_accessunit_internal( importer ) < 0 )
 535     {
 536         importer->status = IMPORTER_ERROR;
 537         return current_status;
 538     }
 539     if( eac3_imp->syncframe_count_in_au )
 540     {
 541         /* Check sample description change. */
 542         uint32_t new_length;
 543         uint8_t *dec3 = lsmash_create_eac3_specific_info( &info->dec3_param, &new_length );
 544         if( !dec3 )
 545         {
 546             importer->status = IMPORTER_ERROR;
 547             return current_status;
 548         }
 549         lsmash_codec_specific_t *cs = isom_get_codec_specific( summary->opaque, LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_EC_3 );
 550         if( (eac3_imp->syncframe_count_in_au > old_syncframe_count_in_au)
 551          || (cs && (new_length != cs->size || memcmp( dec3, cs->data.unstructured, cs->size ))) )
 552         {
 553             importer->status = IMPORTER_CHANGE;
 554             eac3_imp->next_dec3        = dec3;
 555             eac3_imp->next_dec3_length = new_length;
 556         }
 557         else
 558         {
 559             if( importer->status != IMPORTER_EOF )
 560                 importer->status = IMPORTER_OK;
 561             lsmash_free( dec3 );
 562         }
 563     }
 564     return current_status;
 565 }
 566
 567 static lsmash_audio_summary_t *eac3_create_summary( eac3_importer_t *eac3_imp )
 568 {
 569     lsmash_audio_summary_t *summary = (lsmash_audio_summary_t *)lsmash_create_summary( LSMASH_SUMMARY_TYPE_AUDIO );
 570     if( !summary )
 571         return NULL;
 572     eac3_info_t *info = &eac3_imp->info;
 573     lsmash_codec_specific_t *cs = lsmash_create_codec_specific_data( LSMASH_CODEC_SPECIFIC_DATA_TYPE_ISOM_AUDIO_EC_3,
 574                                                                      LSMASH_CODEC_SPECIFIC_FORMAT_UNSTRUCTURED );
 575     if( !cs )
 576     {
 577         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 578         return NULL;
 579     }
 580     cs->data.unstructured = lsmash_create_eac3_specific_info( &info->dec3_param, &cs->size );
 581     if( !cs->data.unstructured
 582      || lsmash_list_add_entry( &summary->opaque->list, cs ) < 0 )
 583     {
 584         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 585         lsmash_destroy_codec_specific_data( cs );
 586         return NULL;
 587     }
 588     summary->sample_type      = ISOM_CODEC_TYPE_EC_3_AUDIO;
 589     summary->max_au_length    = eac3_imp->syncframe_count_in_au * EAC3_MAX_SYNCFRAME_LENGTH;
 590     summary->aot              = MP4A_AUDIO_OBJECT_TYPE_NULL;    /* no effect */
 591     summary->sample_size      = 16;                             /* no effect */
 592     summary->samples_in_frame = EAC3_MIN_SAMPLE_DURATION * 6;   /* 256 (samples per audio block) * 6 (audio blocks) */
 593     summary->sbr_mode         = MP4A_AAC_SBR_NOT_SPECIFIED;     /* no effect */
 594     eac3_update_sample_rate( &summary->frequency, &info->dec3_param, &eac3_imp->current_fscod2 );
 595     eac3_update_channel_count( &summary->channels, &info->dec3_param );
 596     return summary;
 597 }
 598
 599 static int eac3_importer_probe( importer_t *importer )
 600 {
 601     eac3_importer_t *eac3_imp = create_eac3_importer( importer );
 602     if( !eac3_imp )
 603         return LSMASH_ERR_MEMORY_ALLOC;
 604     lsmash_bits_t *bits = eac3_imp->info.bits;
 605     lsmash_bs_t   *bs   = bits->bs;
 606     bs->buffer.max_size = EAC3_MAX_SYNCFRAME_LENGTH;
 607     importer->info = eac3_imp;
 608     int err = eac3_importer_get_next_accessunit_internal( importer );
 609     if( err < 0 )
 610         goto fail;
 611     lsmash_audio_summary_t *summary = eac3_create_summary( eac3_imp );
 612     if( !summary )
 613     {
 614         err = LSMASH_ERR_NAMELESS;
 615         goto fail;
 616     }
 617     if( importer->status != IMPORTER_EOF )
 618         importer->status = IMPORTER_OK;
 619     eac3_imp->au_number = 0;
 620     if( lsmash_list_add_entry( importer->summaries, summary ) < 0 )
 621     {
 622         lsmash_cleanup_summary( (lsmash_summary_t *)summary );
 623         err = LSMASH_ERR_MEMORY_ALLOC;
 624         goto fail;
 625     }
 626     return 0;
 627 fail:
 628     remove_eac3_importer( eac3_imp );
 629     importer->info      = NULL;
 630     return err;
 631 }
 632
 633 static uint32_t eac3_importer_get_last_delta( importer_t *importer, uint32_t track_number )
 634 {
 635     debug_if( !importer || !importer->info )
 636         return 0;
 637     eac3_importer_t *eac3_imp = (eac3_importer_t *)importer->info;
 638     if( !eac3_imp || track_number != 1 || importer->status != IMPORTER_EOF || eac3_imp->au_length )
 639         return 0;
 640     return EAC3_MIN_SAMPLE_DURATION * eac3_imp->info.number_of_audio_blocks;
 641 }
 642
 643 const importer_functions eac3_importer =
 644 {
 645     { "Enhanced AC-3", offsetof( importer_t, log_level ) },
 646     1,
 647     eac3_importer_probe,
 648     eac3_importer_get_accessunit,
 649     eac3_importer_get_last_delta,
 650     eac3_importer_cleanup
 651 };