55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*
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* AAC ADTS header decoding prototypes and structures
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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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#ifndef AVCODEC_AACADTSDEC_H
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#define AVCODEC_AACADTSDEC_H
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#include <stdint.h>
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#include "get_bits.h"
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#define AAC_ADTS_HEADER_SIZE 7
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typedef struct {
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uint32_t sample_rate;
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uint32_t samples;
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uint32_t bit_rate;
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uint8_t crc_absent;
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uint8_t object_type;
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uint8_t sampling_index;
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uint8_t chan_config;
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uint8_t num_aac_frames;
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} AACADTSHeaderInfo;
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/**
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* Parse AAC frame header.
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* Parse the ADTS frame header to the end of the variable header, which is
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* the first 54 bits.
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* @param[in] gbc BitContext containing the first 54 bits of the frame.
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* @param[out] hdr Pointer to struct where header info is written.
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* @return Returns 0 on success, -1 if there is a sync word mismatch,
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* -2 if the version element is invalid, -3 if the sample rate
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* element is invalid, or -4 if the bit rate element is invalid.
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*/
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int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr);
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#endif /* AVCODEC_AACADTSDEC_H */
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