code.delx.au - pulseaudio/blob - src/pulsecore/remap.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk.com>
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2.1 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <string.h>
  28
  29 #include <pulse/sample.h>
  30 #include <pulse/volume.h>
  31 #include <pulsecore/log.h>
  32 #include <pulsecore/macro.h>
  33
  34 #include "remap.h"
  35
  36 static void remap_mono_to_stereo_s16ne_c(pa_remap_t *m, int16_t *dst, const int16_t *src, unsigned n) {
  37     unsigned i;
  38
  39     for (i = n >> 2; i; i--) {
  40         dst[0] = dst[1] = src[0];
  41         dst[2] = dst[3] = src[1];
  42         dst[4] = dst[5] = src[2];
  43         dst[6] = dst[7] = src[3];
  44         src += 4;
  45         dst += 8;
  46     }
  47     for (i = n & 3; i; i--) {
  48         dst[0] = dst[1] = src[0];
  49         src++;
  50         dst += 2;
  51     }
  52 }
  53
  54 static void remap_mono_to_stereo_float32ne_c(pa_remap_t *m, float *dst, const float *src, unsigned n) {
  55     unsigned i;
  56
  57     for (i = n >> 2; i; i--) {
  58         dst[0] = dst[1] = src[0];
  59         dst[2] = dst[3] = src[1];
  60         dst[4] = dst[5] = src[2];
  61         dst[6] = dst[7] = src[3];
  62         src += 4;
  63         dst += 8;
  64     }
  65     for (i = n & 3; i; i--) {
  66         dst[0] = dst[1] = src[0];
  67         src++;
  68         dst += 2;
  69     }
  70 }
  71
  72 static void remap_channels_matrix_s16ne_c(pa_remap_t *m, void *dst, const void *src, unsigned n) {
  73     unsigned oc, ic, i;
  74     unsigned n_ic, n_oc;
  75
  76     n_ic = m->i_ss.channels;
  77     n_oc = m->o_ss.channels;
  78
  79     memset(dst, 0, n * sizeof(int16_t) * n_oc);
  80
  81     for (oc = 0; oc < n_oc; oc++) {
  82
  83         for (ic = 0; ic < n_ic; ic++) {
  84             int16_t *d, *s;
  85             int32_t vol;
  86
  87             vol = m->map_table_i[oc][ic];
  88
  89             if (vol <= 0)
  90                 continue;
  91
  92             d = (int16_t *)dst + oc;
  93             s = (int16_t *)src + ic;
  94
  95             if (vol >= 0x10000) {
  96                 for (i = n; i > 0; i--, s += n_ic, d += n_oc)
  97                     *d += *s;
  98             } else {
  99                 for (i = n; i > 0; i--, s += n_ic, d += n_oc)
 100                     *d += (int16_t) (((int32_t)*s * vol) >> 16);
 101             }
 102         }
 103     }
 104 }
 105
 106 static void remap_channels_matrix_float32ne_c(pa_remap_t *m, void *dst, const void *src, unsigned n) {
 107     unsigned oc, ic, i;
 108     unsigned n_ic, n_oc;
 109
 110     n_ic = m->i_ss.channels;
 111     n_oc = m->o_ss.channels;
 112
 113     memset(dst, 0, n * sizeof(float) * n_oc);
 114
 115     for (oc = 0; oc < n_oc; oc++) {
 116
 117         for (ic = 0; ic < n_ic; ic++) {
 118             float *d, *s;
 119             float vol;
 120
 121             vol = m->map_table_f[oc][ic];
 122
 123             if (vol <= 0.0f)
 124                 continue;
 125
 126             d = (float *)dst + oc;
 127             s = (float *)src + ic;
 128
 129             if (vol >= 1.0f) {
 130                 for (i = n; i > 0; i--, s += n_ic, d += n_oc)
 131                     *d += *s;
 132             } else {
 133                 for (i = n; i > 0; i--, s += n_ic, d += n_oc)
 134                     *d += *s * vol;
 135             }
 136         }
 137     }
 138 }
 139
 140 /* set the function that will execute the remapping based on the matrices */
 141 static void init_remap_c(pa_remap_t *m) {
 142     unsigned n_oc, n_ic;
 143
 144     n_oc = m->o_ss.channels;
 145     n_ic = m->i_ss.channels;
 146
 147     /* find some common channel remappings, fall back to full matrix operation. */
 148     if (n_ic == 1 && n_oc == 2 &&
 149             m->map_table_i[0][0] == 0x10000 && m->map_table_i[1][0] == 0x10000) {
 150
 151         pa_log_info("Using mono to stereo remapping");
 152         switch (m->format) {
 153         case PA_SAMPLE_S16NE:
 154             m->do_remap = (pa_do_remap_func_t) remap_mono_to_stereo_s16ne_c;
 155             break;
 156         case PA_SAMPLE_FLOAT32NE:
 157             m->do_remap = (pa_do_remap_func_t) remap_mono_to_stereo_float32ne_c;
 158             break;
 159         default:
 160             pa_assert_not_reached();
 161         }
 162     } else {
 163         pa_log_info("Using generic matrix remapping");
 164         switch (m->format) {
 165         case PA_SAMPLE_S16NE:
 166             m->do_remap = (pa_do_remap_func_t) remap_channels_matrix_s16ne_c;
 167             break;
 168         case PA_SAMPLE_FLOAT32NE:
 169             m->do_remap = (pa_do_remap_func_t) remap_channels_matrix_float32ne_c;
 170             break;
 171         default:
 172             pa_assert_not_reached();
 173         }
 174     }
 175 }
 176
 177 /* default C implementation */
 178 static pa_init_remap_func_t init_remap_func = init_remap_c;
 179
 180 void pa_init_remap_func(pa_remap_t *m) {
 181     pa_assert(init_remap_func);
 182
 183     m->do_remap = NULL;
 184
 185     /* call the installed remap init function */
 186     init_remap_func(m);
 187
 188     if (m->do_remap == NULL) {
 189         /* nothing was installed, fallback to C version */
 190         init_remap_c(m);
 191     }
 192 }
 193
 194 pa_init_remap_func_t pa_get_init_remap_func(void) {
 195     return init_remap_func;
 196 }
 197
 198 void pa_set_init_remap_func(pa_init_remap_func_t func) {
 199     init_remap_func = func;
 200 }