LCOV - code coverage report
Current view: top level - src/libavcodec - aacadtsdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 30 93.3 %
Date: 2017-07-21 15:41:20 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 "aacadtsdec.h"
      26             : #include "get_bits.h"
      27             : #include "mpeg4audio.h"
      28             : 
      29       42995 : int avpriv_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
      30             : {
      31             :     int size, rdb, ch, sr;
      32             :     int aot, crc_abs;
      33             : 
      34       42995 :     if (get_bits(gbc, 12) != 0xfff)
      35       32874 :         return AAC_AC3_PARSE_ERROR_SYNC;
      36             : 
      37       10121 :     skip_bits1(gbc);             /* id */
      38       10121 :     skip_bits(gbc, 2);           /* layer */
      39       10121 :     crc_abs = get_bits1(gbc);    /* protection_absent */
      40       10121 :     aot     = get_bits(gbc, 2);  /* profile_objecttype */
      41       10121 :     sr      = get_bits(gbc, 4);  /* sample_frequency_index */
      42       10121 :     if (!avpriv_mpeg4audio_sample_rates[sr])
      43           0 :         return AAC_AC3_PARSE_ERROR_SAMPLE_RATE;
      44       10121 :     skip_bits1(gbc);             /* private_bit */
      45       10121 :     ch = get_bits(gbc, 3);       /* channel_configuration */
      46             : 
      47       10121 :     skip_bits1(gbc);             /* original/copy */
      48       10121 :     skip_bits1(gbc);             /* home */
      49             : 
      50             :     /* adts_variable_header */
      51       10121 :     skip_bits1(gbc);             /* copyright_identification_bit */
      52       10121 :     skip_bits1(gbc);             /* copyright_identification_start */
      53       10121 :     size = get_bits(gbc, 13);    /* aac_frame_length */
      54       10121 :     if (size < AAC_ADTS_HEADER_SIZE)
      55           0 :         return AAC_AC3_PARSE_ERROR_FRAME_SIZE;
      56             : 
      57       10121 :     skip_bits(gbc, 11);          /* adts_buffer_fullness */
      58       10121 :     rdb = get_bits(gbc, 2);      /* number_of_raw_data_blocks_in_frame */
      59             : 
      60       10121 :     hdr->object_type    = aot + 1;
      61       10121 :     hdr->chan_config    = ch;
      62       10121 :     hdr->crc_absent     = crc_abs;
      63       10121 :     hdr->num_aac_frames = rdb + 1;
      64       10121 :     hdr->sampling_index = sr;
      65       10121 :     hdr->sample_rate    = avpriv_mpeg4audio_sample_rates[sr];
      66       10121 :     hdr->samples        = (rdb + 1) * 1024;
      67       10121 :     hdr->bit_rate       = size * 8 * hdr->sample_rate / hdr->samples;
      68             : 
      69       10121 :     return size;
      70             : }

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