LCOV - code coverage report
Current view: top level - libavcodec - wma_common.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 12 19 63.2 %
Date: 2017-12-13 10:57:33 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * common code shared by all WMA variants
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #include "libavutil/attributes.h"
      22             : 
      23             : #include "wma_common.h"
      24             : 
      25             : /**
      26             :  *@brief Get the samples per frame for this stream.
      27             :  *@param sample_rate output sample_rate
      28             :  *@param version wma version
      29             :  *@param decode_flags codec compression features
      30             :  *@return log2 of the number of output samples per frame
      31             :  */
      32          32 : av_cold int ff_wma_get_frame_len_bits(int sample_rate, int version,
      33             :                                       unsigned int decode_flags)
      34             : {
      35             :     int frame_len_bits;
      36             : 
      37          32 :     if (sample_rate <= 16000)
      38           3 :         frame_len_bits = 9;
      39          29 :     else if (sample_rate <= 22050 || (sample_rate <= 32000 && version == 1))
      40           0 :         frame_len_bits = 10;
      41          29 :     else if (sample_rate <= 48000 || version < 3)
      42          29 :         frame_len_bits = 11;
      43           0 :     else if (sample_rate <= 96000)
      44           0 :         frame_len_bits = 12;
      45             :     else
      46           0 :         frame_len_bits = 13;
      47             : 
      48          32 :     if (version == 3) {
      49          16 :         int tmp = decode_flags & 0x6;
      50          16 :         if (tmp == 0x2)
      51           0 :             ++frame_len_bits;
      52          16 :         else if (tmp == 0x4)
      53           0 :             --frame_len_bits;
      54          16 :         else if (tmp == 0x6)
      55           0 :             frame_len_bits -= 2;
      56             :     }
      57             : 
      58          32 :     return frame_len_bits;
      59             : }

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