72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
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/*
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* Audio and Video frame extraction
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* Copyright (c) 2003 Fabrice Bellard
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* Copyright (c) 2003 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "parser.h"
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#include "aac_ac3_parser.h"
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#include "adts_header.h"
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#include "adts_parser.h"
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#include "get_bits.h"
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#include "mpeg4audio.h"
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static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
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int *need_next_header, int *new_frame_start)
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{
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GetBitContext bits;
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AACADTSHeaderInfo hdr;
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int size;
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union {
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uint64_t u64;
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uint8_t u8[8 + AV_INPUT_BUFFER_PADDING_SIZE];
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} tmp;
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tmp.u64 = av_be2ne64(state);
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init_get_bits(&bits, tmp.u8 + 8 - AV_AAC_ADTS_HEADER_SIZE,
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AV_AAC_ADTS_HEADER_SIZE * 8);
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if ((size = ff_adts_header_parse(&bits, &hdr)) < 0)
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return 0;
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*need_next_header = 0;
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*new_frame_start = 1;
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hdr_info->sample_rate = hdr.sample_rate;
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hdr_info->channels = ff_mpeg4audio_channels[hdr.chan_config];
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hdr_info->samples = hdr.samples;
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hdr_info->bit_rate = hdr.bit_rate;
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return size;
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}
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static av_cold int aac_parse_init(AVCodecParserContext *s1)
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{
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AACAC3ParseContext *s = s1->priv_data;
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s->header_size = AV_AAC_ADTS_HEADER_SIZE;
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s->sync = aac_sync;
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return 0;
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}
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AVCodecParser ff_aac_parser = {
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.codec_ids = { AV_CODEC_ID_AAC },
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.priv_data_size = sizeof(AACAC3ParseContext),
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.parser_init = aac_parse_init,
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.parser_parse = ff_aac_ac3_parse,
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.parser_close = ff_parse_close,
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};
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