libavcodec/aac_parser.h

   1 /*
   2  * AAC parser prototypes
   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_AAC_PARSER_H
  24 #define AVCODEC_AAC_PARSER_H
  25
  26 #include <stdint.h>
  27 #include "aac_ac3_parser.h"
  28 #include "get_bits.h"
  29
  30 #define AAC_ADTS_HEADER_SIZE 7
  31
  32 typedef struct {
  33     uint32_t sample_rate;
  34     uint32_t samples;
  35     uint32_t bit_rate;
  36     uint8_t  crc_absent;
  37     uint8_t  object_type;
  38     uint8_t  sampling_index;
  39     uint8_t  chan_config;
  40     uint8_t  num_aac_frames;
  41 } AACADTSHeaderInfo;
  42
  43 /**
  44  * Parses AAC frame header.
  45  * Parses the ADTS frame header to the end of the variable header, which is
  46  * the first 54 bits.
  47  * @param gbc[in] BitContext containing the first 54 bits of the frame.
  48  * @param hdr[out] Pointer to struct where header info is written.
  49  * @return Returns 0 on success, -1 if there is a sync word mismatch,
  50  * -2 if the version element is invalid, -3 if the sample rate
  51  * element is invalid, or -4 if the bit rate element is invalid.
  52  */
  53 int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr);
  54
  55 #endif /* AVCODEC_AAC_PARSER_H */