mirror of https://git.ffmpeg.org/ffmpeg.git
80 lines
2.9 KiB
C
80 lines
2.9 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_ADTS_HEADER_H
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#define AVCODEC_ADTS_HEADER_H
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#include "adts_parser.h"
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#include "defs.h"
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typedef enum {
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AAC_PARSE_ERROR_SYNC = -0x1030c0a,
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AAC_PARSE_ERROR_SAMPLE_RATE = -0x3030c0a,
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AAC_PARSE_ERROR_FRAME_SIZE = -0x4030c0a,
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} AACParseError;
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typedef struct AACADTSHeaderInfo {
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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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uint32_t frame_length;
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} AACADTSHeaderInfo;
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struct GetBitContext;
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/**
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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 the size in bytes of the header parsed on success and
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* AAC_PARSE_ERROR_* values otherwise.
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*/
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int ff_adts_header_parse(struct GetBitContext *gbc, AACADTSHeaderInfo *hdr);
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/**
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* Wrapper around ff_adts_header_parse() for users that don't already have
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* a suitable GetBitContext.
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*/
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int ff_adts_header_parse_buf(const uint8_t buf[AV_AAC_ADTS_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE],
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AACADTSHeaderInfo *hdr);
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/**
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* Parse the ADTS frame header contained in the buffer, which is
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* the first 54 bits.
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* @param[in] buf Pointer to buffer containing the first 54 bits of the frame.
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* @param[in] size Size of buffer containing the first 54 bits of the frame.
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* @param[out] phdr Pointer to pointer to struct AACADTSHeaderInfo for which
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* memory is allocated and header info is written into it. After using the header
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* information, the allocated memory must be freed by using av_free.
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* @return 0 on success, AAC_PARSE_ERROR_* values on invalid input and
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* ordinary AVERROR codes otherwise.
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*/
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int avpriv_adts_header_parse(AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size);
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#endif /* AVCODEC_ADTS_HEADER_H */
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