/* * 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 */