/*
  * Audio and Video frame extraction

  * Copyright (c) 2003 Fabrice Bellard
  * Copyright (c) 2003 Michael Niedermayer

  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "parser.h"
 #include "aac_ac3_parser.h"

 #include "aacadtsdec.h"

 #include "get_bits.h"

 #include "mpeg4audio.h"

 static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
         int *need_next_header, int *new_frame_start)

 {
     GetBitContext bits;

     AACADTSHeaderInfo hdr;
     int size;

     union {
         uint64_t u64;
         uint8_t  u8[8];
     } tmp;

     tmp.u64 = av_be2ne64(state);

     init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8);

     if ((size = ff_aac_parse_header(&bits, &hdr)) < 0)

         return 0;

     *need_next_header = 0;
     *new_frame_start  = 1;

     hdr_info->sample_rate = hdr.sample_rate;
     hdr_info->channels    = ff_mpeg4audio_channels[hdr.chan_config];
     hdr_info->samples     = hdr.samples;
     hdr_info->bit_rate    = hdr.bit_rate;

     return size;
 }
 

 static av_cold int aac_parse_init(AVCodecParserContext *s1)

 {

     AACAC3ParseContext *s = s1->priv_data;

     s->header_size = AAC_ADTS_HEADER_SIZE;

     s->sync = aac_sync;
     return 0;
 }
 
 

 AVCodecParser ff_aac_parser = {

     { CODEC_ID_AAC },

     sizeof(AACAC3ParseContext),

     aac_parse_init,

     ff_aac_ac3_parse,

     ff_parse_close,

 };