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  1. /*
  2.  * Audio and Video frame extraction
  3.  * Copyright (c) 2003 Fabrice Bellard
  4.  * Copyright (c) 2003 Michael Niedermayer
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "parser.h"
  24. #include "aac_ac3_parser.h"
  25. #include "aacadtsdec.h"
  26. #include "get_bits.h"
  27. #include "mpeg4audio.h"
  28.  
  29. static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
  30.         int *need_next_header, int *new_frame_start)
  31. {
  32.     GetBitContext bits;
  33.     AACADTSHeaderInfo hdr;
  34.     int size;
  35.     union {
  36.         uint64_t u64;
  37.         uint8_t  u8[8];
  38.     } tmp;
  39.  
  40.     tmp.u64 = av_be2ne64(state);
  41.     init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8);
  42.  
  43.     if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0)
  44.         return 0;
  45.     *need_next_header = 0;
  46.     *new_frame_start  = 1;
  47.     hdr_info->sample_rate = hdr.sample_rate;
  48.     hdr_info->channels    = ff_mpeg4audio_channels[hdr.chan_config];
  49.     hdr_info->samples     = hdr.samples;
  50.     hdr_info->bit_rate    = hdr.bit_rate;
  51.     return size;
  52. }
  53.  
  54. static av_cold int aac_parse_init(AVCodecParserContext *s1)
  55. {
  56.     AACAC3ParseContext *s = s1->priv_data;
  57.     s->header_size = AAC_ADTS_HEADER_SIZE;
  58.     s->sync = aac_sync;
  59.     return 0;
  60. }
  61.  
  62.  
  63. AVCodecParser ff_aac_parser = {
  64.     .codec_ids      = { AV_CODEC_ID_AAC },
  65.     .priv_data_size = sizeof(AACAC3ParseContext),
  66.     .parser_init    = aac_parse_init,
  67.     .parser_parse   = ff_aac_ac3_parse,
  68.     .parser_close   = ff_parse_close,
  69. };
  70.