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/*
* AAC ADTS header decoding prototypes and structures
* 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
*/
#ifndef AVCODEC_ADTS_HEADER_H
#define AVCODEC_ADTS_HEADER_H
#include "adts_parser.h"
#include "defs.h"
typedef enum {
AAC_PARSE_ERROR_SYNC = -0x1030c0a,
AAC_PARSE_ERROR_SAMPLE_RATE = -0x3030c0a,
AAC_PARSE_ERROR_FRAME_SIZE = -0x4030c0a,
} AACParseError;
typedef struct AACADTSHeaderInfo {
uint32_t sample_rate;
uint32_t samples;
uint32_t bit_rate;
uint8_t crc_absent;
uint8_t object_type;
uint8_t sampling_index;
uint8_t chan_config;
uint8_t num_aac_frames;
uint32_t frame_length;
} AACADTSHeaderInfo;
struct GetBitContext;
/**
* Parse the ADTS frame header to the end of the variable header, which is
* the first 54 bits.
* @param[in] gbc BitContext containing the first 54 bits of the frame.
* @param[out] hdr Pointer to struct where header info is written.
* @return the size in bytes of the header parsed on success and
* AAC_PARSE_ERROR_* values otherwise.
*/
int ff_adts_header_parse(struct GetBitContext *gbc, AACADTSHeaderInfo *hdr);
/**
* Wrapper around ff_adts_header_parse() for users that don't already have
* a suitable GetBitContext.
*/
int ff_adts_header_parse_buf(const uint8_t buf[AV_AAC_ADTS_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE],
AACADTSHeaderInfo *hdr);
/**
* Parse the ADTS frame header contained in the buffer, which is
* the first 54 bits.
* @param[in] buf Pointer to buffer containing the first 54 bits of the frame.
* @param[in] size Size of buffer containing the first 54 bits of the frame.
* @param[out] phdr Pointer to pointer to struct AACADTSHeaderInfo for which
* memory is allocated and header info is written into it. After using the header
* information, the allocated memory must be freed by using av_free.
* @return 0 on success, AAC_PARSE_ERROR_* values on invalid input and
* ordinary AVERROR codes otherwise.
*/
int avpriv_adts_header_parse(AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size);
#endif /* AVCODEC_ADTS_HEADER_H */
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