LCOV - code coverage report
Current view: top level - libavcodec - adts_header.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 30 93.3 %
Date: 2017-12-16 01:21:47 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Audio and Video frame extraction
       3             :  * Copyright (c) 2003 Fabrice Bellard
       4             :  * Copyright (c) 2003 Michael Niedermayer
       5             :  * Copyright (c) 2009 Alex Converse
       6             :  *
       7             :  * This file is part of FFmpeg.
       8             :  *
       9             :  * FFmpeg is free software; you can redistribute it and/or
      10             :  * modify it under the terms of the GNU Lesser General Public
      11             :  * License as published by the Free Software Foundation; either
      12             :  * version 2.1 of the License, or (at your option) any later version.
      13             :  *
      14             :  * FFmpeg is distributed in the hope that it will be useful,
      15             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      17             :  * Lesser General Public License for more details.
      18             :  *
      19             :  * You should have received a copy of the GNU Lesser General Public
      20             :  * License along with FFmpeg; if not, write to the Free Software
      21             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      22             :  */
      23             : 
      24             : #include "aac_ac3_parser.h"
      25             : #include "adts_header.h"
      26             : #include "adts_parser.h"
      27             : #include "get_bits.h"
      28             : #include "mpeg4audio.h"
      29             : 
      30       42995 : int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
      31             : {
      32             :     int size, rdb, ch, sr;
      33             :     int aot, crc_abs;
      34             : 
      35       42995 :     if (get_bits(gbc, 12) != 0xfff)
      36       32874 :         return AAC_AC3_PARSE_ERROR_SYNC;
      37             : 
      38       10121 :     skip_bits1(gbc);             /* id */
      39       10121 :     skip_bits(gbc, 2);           /* layer */
      40       10121 :     crc_abs = get_bits1(gbc);    /* protection_absent */
      41       10121 :     aot     = get_bits(gbc, 2);  /* profile_objecttype */
      42       10121 :     sr      = get_bits(gbc, 4);  /* sample_frequency_index */
      43       10121 :     if (!avpriv_mpeg4audio_sample_rates[sr])
      44           0 :         return AAC_AC3_PARSE_ERROR_SAMPLE_RATE;
      45       10121 :     skip_bits1(gbc);             /* private_bit */
      46       10121 :     ch = get_bits(gbc, 3);       /* channel_configuration */
      47             : 
      48       10121 :     skip_bits1(gbc);             /* original/copy */
      49       10121 :     skip_bits1(gbc);             /* home */
      50             : 
      51             :     /* adts_variable_header */
      52       10121 :     skip_bits1(gbc);             /* copyright_identification_bit */
      53       10121 :     skip_bits1(gbc);             /* copyright_identification_start */
      54       10121 :     size = get_bits(gbc, 13);    /* aac_frame_length */
      55       10121 :     if (size < AV_AAC_ADTS_HEADER_SIZE)
      56           0 :         return AAC_AC3_PARSE_ERROR_FRAME_SIZE;
      57             : 
      58       10121 :     skip_bits(gbc, 11);          /* adts_buffer_fullness */
      59       10121 :     rdb = get_bits(gbc, 2);      /* number_of_raw_data_blocks_in_frame */
      60             : 
      61       10121 :     hdr->object_type    = aot + 1;
      62       10121 :     hdr->chan_config    = ch;
      63       10121 :     hdr->crc_absent     = crc_abs;
      64       10121 :     hdr->num_aac_frames = rdb + 1;
      65       10121 :     hdr->sampling_index = sr;
      66       10121 :     hdr->sample_rate    = avpriv_mpeg4audio_sample_rates[sr];
      67       10121 :     hdr->samples        = (rdb + 1) * 1024;
      68       10121 :     hdr->bit_rate       = size * 8 * hdr->sample_rate / hdr->samples;
      69             : 
      70       10121 :     return size;
      71             : }

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