yading@10: /*
yading@10:  * AAC ADTS header decoding prototypes and structures
yading@10:  * Copyright (c) 2003 Fabrice Bellard
yading@10:  * Copyright (c) 2003 Michael Niedermayer
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_AACADTSDEC_H
yading@10: #define AVCODEC_AACADTSDEC_H
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include "get_bits.h"
yading@10: 
yading@10: #define AAC_ADTS_HEADER_SIZE 7
yading@10: 
yading@10: typedef struct AACADTSHeaderInfo {
yading@10:     uint32_t sample_rate;
yading@10:     uint32_t samples;
yading@10:     uint32_t bit_rate;
yading@10:     uint8_t  crc_absent;
yading@10:     uint8_t  object_type;
yading@10:     uint8_t  sampling_index;
yading@10:     uint8_t  chan_config;
yading@10:     uint8_t  num_aac_frames;
yading@10: } AACADTSHeaderInfo;
yading@10: 
yading@10: /**
yading@10:  * Parse AAC frame header.
yading@10:  * Parse the ADTS frame header to the end of the variable header, which is
yading@10:  * the first 54 bits.
yading@10:  * @param[in]  gbc BitContext containing the first 54 bits of the frame.
yading@10:  * @param[out] hdr Pointer to struct where header info is written.
yading@10:  * @return Returns 0 on success, -1 if there is a sync word mismatch,
yading@10:  * -2 if the version element is invalid, -3 if the sample rate
yading@10:  * element is invalid, or -4 if the bit rate element is invalid.
yading@10:  */
yading@10: int avpriv_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr);
yading@10: 
yading@10: #endif /* AVCODEC_AACADTSDEC_H */