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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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✓✓ |
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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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}; |