libavcodec/flacdsp_template.c

   1 /*
   2  * Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <stdint.h>
  22
  23 #undef FUNC
  24 #undef sample
  25
  26 #if SAMPLE_SIZE == 32
  27 #   define FUNC(n) n ## _32
  28 #   define sample  int32_t
  29 #else
  30 #   define FUNC(n) n ## _16
  31 #   define sample  int16_t
  32 #endif
  33
  34 static void FUNC(flac_decorrelate_indep_c)(uint8_t **out, int32_t **in,
  35                                            int channels, int len, int shift)
  36 {
  37     sample *samples = (sample *) out[0];
  38     int i, j;
  39
  40     for (j = 0; j < len; j++)
  41         for (i = 0; i < channels; i++)
  42             *samples++ = in[i][j] << shift;
  43 }
  44
  45 static void FUNC(flac_decorrelate_ls_c)(uint8_t **out, int32_t **in,
  46                                         int channels, int len, int shift)
  47 {
  48     sample *samples = (sample *) out[0];
  49     int i;
  50
  51     for (i = 0; i < len; i++) {
  52         int a = in[0][i];
  53         int b = in[1][i];
  54         *samples++ =  a      << shift;
  55         *samples++ = (a - b) << shift;
  56     }
  57 }
  58
  59 static void FUNC(flac_decorrelate_rs_c)(uint8_t **out, int32_t **in,
  60                                         int channels, int len, int shift)
  61 {
  62     sample *samples = (sample *) out[0];
  63     int i;
  64
  65     for (i = 0; i < len; i++) {
  66         int a = in[0][i];
  67         int b = in[1][i];
  68         *samples++ = (a + b) << shift;
  69         *samples++ =  b      << shift;
  70     }
  71 }
  72
  73 static void FUNC(flac_decorrelate_ms_c)(uint8_t **out, int32_t **in,
  74                                         int channels, int len, int shift)
  75 {
  76     sample *samples = (sample *) out[0];
  77     int i;
  78
  79     for (i = 0; i < len; i++) {
  80         int a = in[0][i];
  81         int b = in[1][i];
  82         a -= b >> 1;
  83         *samples++ = (a + b) << shift;
  84         *samples++ =  a      << shift;
  85     }
  86 }