code.delx.au - pulseaudio/blob - src/pulse/volume.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include <pulse/i18n.h>
  30 #include <pulsecore/core-util.h>
  31 #include <pulsecore/macro.h>
  32
  33 #include "volume.h"
  34
  35 int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) {
  36     int i;
  37     pa_assert(a);
  38     pa_assert(b);
  39
  40     if (a->channels != b->channels)
  41         return 0;
  42
  43     for (i = 0; i < a->channels; i++)
  44         if (a->values[i] != b->values[i])
  45             return 0;
  46
  47     return 1;
  48 }
  49
  50 pa_cvolume* pa_cvolume_init(pa_cvolume *a) {
  51     unsigned c;
  52
  53     pa_assert(a);
  54
  55     a->channels = 0;
  56
  57     for (c = 0; c < PA_CHANNELS_MAX; c++)
  58         a->values[c] = (pa_volume_t) -1;
  59
  60     return a;
  61 }
  62
  63 pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) {
  64     int i;
  65
  66     pa_assert(a);
  67     pa_assert(channels > 0);
  68     pa_assert(channels <= PA_CHANNELS_MAX);
  69
  70     a->channels = (uint8_t) channels;
  71
  72     for (i = 0; i < a->channels; i++)
  73         a->values[i] = v;
  74
  75     return a;
  76 }
  77
  78 pa_volume_t pa_cvolume_avg(const pa_cvolume *a) {
  79     uint64_t sum = 0;
  80     int i;
  81     pa_assert(a);
  82
  83     for (i = 0; i < a->channels; i++)
  84         sum += a->values[i];
  85
  86     sum /= a->channels;
  87
  88     return (pa_volume_t) sum;
  89 }
  90
  91 pa_volume_t pa_cvolume_max(const pa_cvolume *a) {
  92     pa_volume_t m = 0;
  93     int i;
  94     pa_assert(a);
  95
  96     for (i = 0; i < a->channels; i++)
  97         if (a->values[i] > m)
  98             m = a->values[i];
  99
 100     return m;
 101 }
 102
 103 pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
 104     return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a) * pa_sw_volume_to_linear(b));
 105 }
 106
 107 pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) {
 108     double v = pa_sw_volume_to_linear(b);
 109
 110     if (v <= 0)
 111         return 0;
 112
 113     return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a) / v);
 114 }
 115
 116 #define USER_DECIBEL_RANGE 60
 117
 118 pa_volume_t pa_sw_volume_from_dB(double dB) {
 119     if (isinf(dB) < 0 || dB <= -USER_DECIBEL_RANGE)
 120         return PA_VOLUME_MUTED;
 121
 122     return (pa_volume_t) lrint((dB/USER_DECIBEL_RANGE+1)*PA_VOLUME_NORM);
 123 }
 124
 125 double pa_sw_volume_to_dB(pa_volume_t v) {
 126     if (v == PA_VOLUME_MUTED)
 127         return PA_DECIBEL_MININFTY;
 128
 129     return ((double) v/PA_VOLUME_NORM-1)*USER_DECIBEL_RANGE;
 130 }
 131
 132 pa_volume_t pa_sw_volume_from_linear(double v) {
 133
 134     if (v <= 0)
 135         return PA_VOLUME_MUTED;
 136
 137     if (v > .999 && v < 1.001)
 138         return PA_VOLUME_NORM;
 139
 140     return pa_sw_volume_from_dB(20*log10(v));
 141 }
 142
 143 double pa_sw_volume_to_linear(pa_volume_t v) {
 144
 145     if (v == PA_VOLUME_MUTED)
 146         return 0;
 147
 148     return pow(10.0, pa_sw_volume_to_dB(v)/20.0);
 149 }
 150
 151 char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c) {
 152     unsigned channel;
 153     pa_bool_t first = TRUE;
 154     char *e;
 155
 156     pa_assert(s);
 157     pa_assert(l > 0);
 158     pa_assert(c);
 159
 160     pa_init_i18n();
 161
 162     if (!pa_cvolume_valid(c)) {
 163         pa_snprintf(s, l, _("(invalid)"));
 164         return s;
 165     }
 166
 167     *(e = s) = 0;
 168
 169     for (channel = 0; channel < c->channels && l > 1; channel++) {
 170         l -= pa_snprintf(e, l, "%s%u: %3u%%",
 171                       first ? "" : " ",
 172                       channel,
 173                       (c->values[channel]*100)/PA_VOLUME_NORM);
 174
 175         e = strchr(e, 0);
 176         first = FALSE;
 177     }
 178
 179     return s;
 180 }
 181
 182 char *pa_sw_cvolume_snprint_dB(char *s, size_t l, const pa_cvolume *c) {
 183     unsigned channel;
 184     pa_bool_t first = TRUE;
 185     char *e;
 186
 187     pa_assert(s);
 188     pa_assert(l > 0);
 189     pa_assert(c);
 190
 191     pa_init_i18n();
 192
 193     if (!pa_cvolume_valid(c)) {
 194         pa_snprintf(s, l, _("(invalid)"));
 195         return s;
 196     }
 197
 198     *(e = s) = 0;
 199
 200     for (channel = 0; channel < c->channels && l > 1; channel++) {
 201         l -= pa_snprintf(e, l, "%s%u: %0.2f dB",
 202                       first ? "" : " ",
 203                       channel,
 204                       pa_sw_volume_to_dB(c->values[channel]));
 205
 206         e = strchr(e, 0);
 207         first = FALSE;
 208     }
 209
 210     return s;
 211 }
 212
 213 /** Return non-zero if the volume of all channels is equal to the specified value */
 214 int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) {
 215     unsigned c;
 216     pa_assert(a);
 217
 218     for (c = 0; c < a->channels; c++)
 219         if (a->values[c] != v)
 220             return 0;
 221
 222     return 1;
 223 }
 224
 225 pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
 226     unsigned i;
 227
 228     pa_assert(dest);
 229     pa_assert(a);
 230     pa_assert(b);
 231
 232     for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
 233         dest->values[i] = pa_sw_volume_multiply(a->values[i], b->values[i]);
 234
 235     dest->channels = (uint8_t) i;
 236
 237     return dest;
 238 }
 239
 240 pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
 241     unsigned i;
 242
 243     pa_assert(dest);
 244     pa_assert(a);
 245     pa_assert(b);
 246
 247     for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
 248         dest->values[i] = pa_sw_volume_divide(a->values[i], b->values[i]);
 249
 250     dest->channels = (uint8_t) i;
 251
 252     return dest;
 253 }
 254
 255 int pa_cvolume_valid(const pa_cvolume *v) {
 256     unsigned c;
 257
 258     pa_assert(v);
 259
 260     if (v->channels <= 0 || v->channels > PA_CHANNELS_MAX)
 261         return 0;
 262
 263     for (c = 0; c < v->channels; c++)
 264         if (v->values[c] == (pa_volume_t) -1)
 265             return 0;
 266
 267     return 1;
 268 }
 269
 270 static pa_bool_t on_left(pa_channel_position_t p) {
 271
 272     return
 273         p == PA_CHANNEL_POSITION_FRONT_LEFT ||
 274         p == PA_CHANNEL_POSITION_REAR_LEFT ||
 275         p == PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER ||
 276         p == PA_CHANNEL_POSITION_SIDE_LEFT ||
 277         p == PA_CHANNEL_POSITION_TOP_FRONT_LEFT ||
 278         p == PA_CHANNEL_POSITION_TOP_REAR_LEFT;
 279 }
 280
 281 static pa_bool_t on_right(pa_channel_position_t p) {
 282
 283     return
 284         p == PA_CHANNEL_POSITION_FRONT_RIGHT ||
 285         p == PA_CHANNEL_POSITION_REAR_RIGHT ||
 286         p == PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER ||
 287         p == PA_CHANNEL_POSITION_SIDE_RIGHT ||
 288         p == PA_CHANNEL_POSITION_TOP_FRONT_RIGHT ||
 289         p == PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
 290 }
 291
 292 static pa_bool_t on_center(pa_channel_position_t p) {
 293
 294     return
 295         p == PA_CHANNEL_POSITION_FRONT_CENTER ||
 296         p == PA_CHANNEL_POSITION_REAR_CENTER ||
 297         p == PA_CHANNEL_POSITION_TOP_CENTER ||
 298         p == PA_CHANNEL_POSITION_TOP_FRONT_CENTER ||
 299         p == PA_CHANNEL_POSITION_TOP_REAR_CENTER;
 300 }
 301
 302 static pa_bool_t on_lfe(pa_channel_position_t p) {
 303     return
 304         p == PA_CHANNEL_POSITION_LFE;
 305 }
 306
 307 pa_cvolume *pa_cvolume_remap(pa_cvolume *v, pa_channel_map *from, pa_channel_map *to) {
 308     int a, b;
 309     pa_cvolume result;
 310
 311     pa_assert(v);
 312     pa_assert(from);
 313     pa_assert(to);
 314     pa_assert(v->channels == from->channels);
 315
 316     if (pa_channel_map_equal(from, to))
 317         return v;
 318
 319     result.channels = to->channels;
 320
 321     for (b = 0; b < to->channels; b++) {
 322         pa_volume_t k = 0;
 323         int n = 0;
 324
 325         for (a = 0; a < from->channels; a++)
 326             if (from->map[a] == to->map[b]) {
 327                 k += v->values[a];
 328                 n ++;
 329             }
 330
 331         if (n <= 0) {
 332             for (a = 0; a < from->channels; a++)
 333                 if ((on_left(from->map[a]) && on_left(to->map[b])) ||
 334                     (on_right(from->map[a]) && on_right(to->map[b])) ||
 335                     (on_center(from->map[a]) && on_center(to->map[b])) ||
 336                     (on_lfe(from->map[a]) && on_lfe(to->map[b]))) {
 337
 338                     k += v->values[a];
 339                     n ++;
 340                 }
 341         }
 342
 343         if (n <= 0)
 344             k = pa_cvolume_avg(v);
 345         else
 346             k /= n;
 347
 348         result.values[b] = k;
 349     }
 350
 351     *v = result;
 352     return v;
 353 }
 354
 355 int pa_cvolume_compatible(const pa_cvolume *v, const pa_sample_spec *ss) {
 356
 357     pa_assert(v);
 358     pa_assert(ss);
 359
 360     if (!pa_cvolume_valid(v))
 361         return 0;
 362
 363     if (!pa_sample_spec_valid(ss))
 364         return 0;
 365
 366     return v->channels == ss->channels;
 367 }