mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
12ded9cd85
Most users of ff_adts_header_parse() don't already have an opened GetBitContext for the header, so add a convenience function for them. Also use a forward declaration of GetBitContext in adts_header.h as this avoids (implicit) inclusion of get_bits.h in some of the users that now no longer use a GetBitContext of their own. Reviewed-by: James Almer <jamrial@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/*
|
|
* 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 */
|