ffmpeg/libavcodec/flacdsp_template.c

   1 /*
   2  * Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
   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 <stdint.h>
  22 #include "libavutil/avutil.h"
  23
  24 #undef FUNC
  25 #undef FSUF
  26 #undef sample
  27 #undef sample_type
  28 #undef OUT
  29 #undef S
  30
  31 #if SAMPLE_SIZE == 32
  32 #   define sample_type  int32_t
  33 #else
  34 #   define sample_type  int16_t
  35 #endif
  36
  37 #if PLANAR
  38 #   define FSUF   AV_JOIN(SAMPLE_SIZE, p)
  39 #   define sample sample_type *
  40 #   define OUT(n) n
  41 #   define S(s, c, i) (s[c][i])
  42 #else
  43 #   define FSUF   SAMPLE_SIZE
  44 #   define sample sample_type
  45 #   define OUT(n) n[0]
  46 #   define S(s, c, i) (*s++)
  47 #endif
  48
  49 #define FUNC(n) AV_JOIN(n ## _, FSUF)
  50
  51 static void FUNC(flac_decorrelate_indep_c)(uint8_t **out, int32_t **in,
  52                                            int channels, int len, int shift)
  53 {
  54     sample *samples = (sample *) OUT(out);
  55     int i, j;
  56
  57     for (j = 0; j < len; j++)
  58         for (i = 0; i < channels; i++)
  59             S(samples, i, j) = in[i][j] << shift;
  60 }
  61
  62 static void FUNC(flac_decorrelate_ls_c)(uint8_t **out, int32_t **in,
  63                                         int channels, int len, int shift)
  64 {
  65     sample *samples = (sample *) OUT(out);
  66     int i;
  67
  68     for (i = 0; i < len; i++) {
  69         int a = in[0][i];
  70         int b = in[1][i];
  71         S(samples, 0, i) =  a      << shift;
  72         S(samples, 1, i) = (a - b) << shift;
  73     }
  74 }
  75
  76 static void FUNC(flac_decorrelate_rs_c)(uint8_t **out, int32_t **in,
  77                                         int channels, int len, int shift)
  78 {
  79     sample *samples = (sample *) OUT(out);
  80     int i;
  81
  82     for (i = 0; i < len; i++) {
  83         int a = in[0][i];
  84         int b = in[1][i];
  85         S(samples, 0, i) = (a + b) << shift;
  86         S(samples, 1, i) =  b      << shift;
  87     }
  88 }
  89
  90 static void FUNC(flac_decorrelate_ms_c)(uint8_t **out, int32_t **in,
  91                                         int channels, int len, int shift)
  92 {
  93     sample *samples = (sample *) OUT(out);
  94     int i;
  95
  96     for (i = 0; i < len; i++) {
  97         int a = in[0][i];
  98         int b = in[1][i];
  99         a -= b >> 1;
 100         S(samples, 0, i) = (a + b) << shift;
 101         S(samples, 1, i) =  a      << shift;
 102     }
 103 }