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Member "ffmpeg-3.4.2/libavcodec/aacadtsdec.h" (29 Mar 2016, 1876 Bytes) of package /linux/misc/ffmpeg-3.4.2.tar.xz:


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    1 /*
    2  * AAC ADTS header decoding prototypes and structures
    3  * Copyright (c) 2003 Fabrice Bellard
    4  * Copyright (c) 2003 Michael Niedermayer
    5  *
    6  * This file is part of FFmpeg.
    7  *
    8  * FFmpeg is free software; you can redistribute it and/or
    9  * modify it under the terms of the GNU Lesser General Public
   10  * License as published by the Free Software Foundation; either
   11  * version 2.1 of the License, or (at your option) any later version.
   12  *
   13  * FFmpeg is distributed in the hope that it will be useful,
   14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   16  * Lesser General Public License for more details.
   17  *
   18  * You should have received a copy of the GNU Lesser General Public
   19  * License along with FFmpeg; if not, write to the Free Software
   20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   21  */
   22 
   23 #ifndef AVCODEC_AACADTSDEC_H
   24 #define AVCODEC_AACADTSDEC_H
   25 
   26 #include <stdint.h>
   27 #include "get_bits.h"
   28 
   29 #define AAC_ADTS_HEADER_SIZE 7
   30 
   31 typedef struct AACADTSHeaderInfo {
   32     uint32_t sample_rate;
   33     uint32_t samples;
   34     uint32_t bit_rate;
   35     uint8_t  crc_absent;
   36     uint8_t  object_type;
   37     uint8_t  sampling_index;
   38     uint8_t  chan_config;
   39     uint8_t  num_aac_frames;
   40 } AACADTSHeaderInfo;
   41 
   42 /**
   43  * Parse AAC frame header.
   44  * Parse the ADTS frame header to the end of the variable header, which is
   45  * the first 54 bits.
   46  * @param[in]  gbc BitContext containing the first 54 bits of the frame.
   47  * @param[out] hdr Pointer to struct where header info is written.
   48  * @return Returns 0 on success, -1 if there is a sync word mismatch,
   49  * -2 if the version element is invalid, -3 if the sample rate
   50  * element is invalid, or -4 if the bit rate element is invalid.
   51  */
   52 int avpriv_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr);
   53 
   54 #endif /* AVCODEC_AACADTSDEC_H */