/* * 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 "adts_header.h"#include "adts_parser.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 + AV_INPUT_BUFFER_PADDING_SIZE];    } tmp;     tmp.u64 = av_be2ne64(state);    init_get_bits(&bits, tmp.u8 + 8 - AV_AAC_ADTS_HEADER_SIZE,                  AV_AAC_ADTS_HEADER_SIZE * 8);     if ((size = ff_adts_header_parse(&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 = AV_AAC_ADTS_HEADER_SIZE;    s->sync = aac_sync;    return 0;}  AVCodecParser ff_aac_parser = {    .codec_ids      = { AV_CODEC_ID_AAC },    .priv_data_size = sizeof(AACAC3ParseContext),    .parser_init    = aac_parse_init,    .parser_parse   = ff_aac_ac3_parse,    .parser_close   = ff_parse_close,};