LCOV - code coverage report
Current view: top level - libavcodec - mpegaudiodecheader.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 10 10 100.0 %
Date: 2017-12-16 21:16:39 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * MPEG Audio header decoder
       3             :  * Copyright (c) 2001, 2002 Fabrice Bellard
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * MPEG Audio header decoder.
      25             :  */
      26             : 
      27             : #ifndef AVCODEC_MPEGAUDIODECHEADER_H
      28             : #define AVCODEC_MPEGAUDIODECHEADER_H
      29             : 
      30             : #include "avcodec.h"
      31             : 
      32             : #define MP3_MASK 0xFFFE0CCF
      33             : 
      34             : #define MPA_DECODE_HEADER \
      35             :     int frame_size; \
      36             :     int error_protection; \
      37             :     int layer; \
      38             :     int sample_rate; \
      39             :     int sample_rate_index; /* between 0 and 8 */ \
      40             :     int bit_rate; \
      41             :     int nb_channels; \
      42             :     int mode; \
      43             :     int mode_ext; \
      44             :     int lsf;
      45             : 
      46             : typedef struct MPADecodeHeader {
      47             :   MPA_DECODE_HEADER
      48             : } MPADecodeHeader;
      49             : 
      50             : /* header decoding. MUST check the header before because no
      51             :    consistency check is done there. Return 1 if free format found and
      52             :    that the frame size must be computed externally */
      53             : int avpriv_mpegaudio_decode_header(MPADecodeHeader *s, uint32_t header);
      54             : 
      55             : /* useful helper to get MPEG audio stream info. Return -1 if error in
      56             :    header, otherwise the coded frame size in bytes */
      57             : int ff_mpa_decode_header(uint32_t head, int *sample_rate,
      58             :                          int *channels, int *frame_size, int *bitrate, enum AVCodecID *codec_id);
      59             : 
      60             : /* fast header check for resync */
      61   114978416 : static inline int ff_mpa_check_header(uint32_t header){
      62             :     /* header */
      63   114978416 :     if ((header & 0xffe00000) != 0xffe00000)
      64   114503365 :         return -1;
      65             :     /* layer check */
      66      475051 :     if ((header & (3<<17)) == 0)
      67       97169 :         return -1;
      68             :     /* bit rate */
      69      377882 :     if ((header & (0xf<<12)) == 0xf<<12)
      70      269353 :         return -1;
      71             :     /* frequency */
      72      108529 :     if ((header & (3<<10)) == 3<<10)
      73       17573 :         return -1;
      74       90956 :     return 0;
      75             : }
      76             : 
      77             : #endif /* AVCODEC_MPEGAUDIODECHEADER_H */

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