LCOV - code coverage report
Current view: top level - src/libavcodec - alacdsp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 20 20 100.0 %
Date: 2017-03-25 17:02:41 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * ALAC (Apple Lossless Audio Codec) decoder
       3             :  * Copyright (c) 2005 David Hammerton
       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             : #include "libavutil/attributes.h"
      23             : #include "alacdsp.h"
      24             : #include "config.h"
      25             : 
      26         479 : static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
      27             :                                int decorr_shift, int decorr_left_weight)
      28             : {
      29             :     int i;
      30             : 
      31     1939946 :     for (i = 0; i < nb_samples; i++) {
      32             :         int32_t a, b;
      33             : 
      34     1939467 :         a = buffer[0][i];
      35     1939467 :         b = buffer[1][i];
      36             : 
      37     1939467 :         a -= (b * decorr_left_weight) >> decorr_shift;
      38     1939467 :         b += a;
      39             : 
      40     1939467 :         buffer[0][i] = b;
      41     1939467 :         buffer[1][i] = a;
      42             :     }
      43         479 : }
      44             : 
      45        1413 : static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
      46             :                               int extra_bits, int channels, int nb_samples)
      47             : {
      48             :     int i, ch;
      49             : 
      50        4236 :     for (ch = 0; ch < channels; ch++)
      51    11524075 :         for (i = 0; i < nb_samples; i++)
      52    11521252 :             buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
      53        1413 : }
      54             : 
      55          48 : av_cold void ff_alacdsp_init(ALACDSPContext *c)
      56             : {
      57          48 :     c->decorrelate_stereo   = decorrelate_stereo;
      58          48 :     c->append_extra_bits[0] =
      59          48 :     c->append_extra_bits[1] = append_extra_bits;
      60             : 
      61             :     if (ARCH_X86)
      62          48 :         ff_alacdsp_init_x86(c);
      63          48 : }

Generated by: LCOV version 1.13