libavcodec/aac_parser.c

   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 "adts_header.h"
  26 #include "adts_parser.h"
  27 #include "libavutil/intreadwrite.h"
  28
  29 static int aac_sync(uint64_t state, int *need_next_header, int *new_frame_start)
  30 {
  31     uint8_t tmp[8 + AV_INPUT_BUFFER_PADDING_SIZE];
  32     AACADTSHeaderInfo hdr;
  33     int size;
  34
  35     AV_WB64(tmp, state);
  36
  37     size = ff_adts_header_parse_buf(tmp + 8 - AV_AAC_ADTS_HEADER_SIZE, &hdr);
  38     if (size < 0)
  39         return 0;
  40     *need_next_header = 0;
  41     *new_frame_start  = 1;
  42     return size;
  43 }
  44
  45 static av_cold int aac_parse_init(AVCodecParserContext *s1)
  46 {
  47     AACAC3ParseContext *s = s1->priv_data;
  48     s->header_size = AV_AAC_ADTS_HEADER_SIZE;
  49     s->sync = aac_sync;
  50     return 0;
  51 }
  52
  53
  54 const AVCodecParser ff_aac_parser = {
  55     .codec_ids      = { AV_CODEC_ID_AAC },
  56     .priv_data_size = sizeof(AACAC3ParseContext),
  57     .parser_init    = aac_parse_init,
  58     .parser_parse   = ff_aac_ac3_parse,
  59     .parser_close   = ff_parse_close,
  60 };