code.delx.au - pulseaudio/blob - src/pulsecore/sample-util.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   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 #include <assert.h>
  29 #include <stdlib.h>
  30
  31 #include <liboil/liboilfuncs.h>
  32
  33 #include <pulsecore/log.h>
  34
  35 #include "sample-util.h"
  36 #include "endianmacros.h"
  37
  38 pa_memblock *pa_silence_memblock_new(pa_mempool *pool, const pa_sample_spec *spec, size_t length) {
  39     assert(pool);
  40     assert(spec);
  41
  42     if (length == 0)
  43         length = pa_bytes_per_second(spec)/20; /* 50 ms */
  44
  45     return pa_silence_memblock(pa_memblock_new(pool, length), spec);
  46 }
  47
  48 pa_memblock *pa_silence_memblock(pa_memblock* b, const pa_sample_spec *spec) {
  49     assert(b && b->data && spec);
  50     pa_silence_memory(b->data, b->length, spec);
  51     return b;
  52 }
  53
  54 void pa_silence_memchunk(pa_memchunk *c, const pa_sample_spec *spec) {
  55     assert(c && c->memblock && c->memblock->data && spec && c->length);
  56
  57     pa_silence_memory((uint8_t*) c->memblock->data+c->index, c->length, spec);
  58 }
  59
  60 void pa_silence_memory(void *p, size_t length, const pa_sample_spec *spec) {
  61     uint8_t c = 0;
  62     assert(p && length && spec);
  63
  64     switch (spec->format) {
  65         case PA_SAMPLE_U8:
  66             c = 0x80;
  67             break;
  68         case PA_SAMPLE_S16LE:
  69         case PA_SAMPLE_S16BE:
  70         case PA_SAMPLE_FLOAT32:
  71             c = 0;
  72             break;
  73         case PA_SAMPLE_ALAW:
  74         case PA_SAMPLE_ULAW:
  75             c = 80;
  76             break;
  77         default:
  78             assert(0);
  79     }
  80
  81     memset(p, c, length);
  82 }
  83
  84 size_t pa_mix(
  85     const pa_mix_info streams[],
  86     unsigned nstreams,
  87     void *data,
  88     size_t length,
  89     const pa_sample_spec *spec,
  90     const pa_cvolume *volume,
  91     int mute) {
  92
  93     assert(streams && data && length && spec);
  94
  95     switch (spec->format) {
  96         case PA_SAMPLE_S16NE:{
  97             size_t d;
  98             unsigned channel = 0;
  99
 100             for (d = 0;; d += sizeof(int16_t)) {
 101                 int32_t sum = 0;
 102
 103                 if (d >= length)
 104                     return d;
 105
 106                 if (!mute && volume->values[channel] != PA_VOLUME_MUTED) {
 107                     unsigned i;
 108
 109                     for (i = 0; i < nstreams; i++) {
 110                         int32_t v;
 111                         pa_volume_t cvolume = streams[i].volume.values[channel];
 112
 113                         if (d >= streams[i].chunk.length)
 114                             return d;
 115
 116                         if (cvolume == PA_VOLUME_MUTED)
 117                             v = 0;
 118                         else {
 119                             v = *((int16_t*) ((uint8_t*) streams[i].chunk.memblock->data + streams[i].chunk.index + d));
 120
 121                             if (cvolume != PA_VOLUME_NORM)
 122                                 v = (int32_t) (v * pa_sw_volume_to_linear(cvolume));
 123                         }
 124
 125                         sum += v;
 126                     }
 127
 128                     if (volume->values[channel] != PA_VOLUME_NORM)
 129                         sum = (int32_t) (sum * pa_sw_volume_to_linear(volume->values[channel]));
 130
 131                     if (sum < -0x8000) sum = -0x8000;
 132                     if (sum > 0x7FFF) sum = 0x7FFF;
 133
 134                 }
 135
 136                 *((int16_t*) data) = sum;
 137                 data = (uint8_t*) data + sizeof(int16_t);
 138
 139                 if (++channel >= spec->channels)
 140                     channel = 0;
 141             }
 142         }
 143
 144         case PA_SAMPLE_S16RE:{
 145             size_t d;
 146             unsigned channel = 0;
 147
 148             for (d = 0;; d += sizeof(int16_t)) {
 149                 int32_t sum = 0;
 150
 151                 if (d >= length)
 152                     return d;
 153
 154                 if (!mute && volume->values[channel] != PA_VOLUME_MUTED) {
 155                     unsigned i;
 156
 157                     for (i = 0; i < nstreams; i++) {
 158                         int32_t v;
 159                         pa_volume_t cvolume = streams[i].volume.values[channel];
 160
 161                         if (d >= streams[i].chunk.length)
 162                             return d;
 163
 164                         if (cvolume == PA_VOLUME_MUTED)
 165                             v = 0;
 166                         else {
 167                             v = INT16_SWAP(*((int16_t*) ((uint8_t*) streams[i].chunk.memblock->data + streams[i].chunk.index + d)));
 168
 169                             if (cvolume != PA_VOLUME_NORM)
 170                                 v = (int32_t) (v * pa_sw_volume_to_linear(cvolume));
 171                         }
 172
 173                         sum += v;
 174                     }
 175
 176                     if (volume->values[channel] != PA_VOLUME_NORM)
 177                         sum = (int32_t) (sum * pa_sw_volume_to_linear(volume->values[channel]));
 178
 179                     if (sum < -0x8000) sum = -0x8000;
 180                     if (sum > 0x7FFF) sum = 0x7FFF;
 181
 182                 }
 183
 184                 *((int16_t*) data) = INT16_SWAP(sum);
 185                 data = (uint8_t*) data + sizeof(int16_t);
 186
 187                 if (++channel >= spec->channels)
 188                     channel = 0;
 189             }
 190         }
 191
 192         case PA_SAMPLE_U8: {
 193             size_t d;
 194             unsigned channel = 0;
 195
 196             for (d = 0;; d ++) {
 197                 int32_t sum = 0;
 198
 199                 if (d >= length)
 200                     return d;
 201
 202                 if (!mute && volume->values[channel] != PA_VOLUME_MUTED) {
 203                     unsigned i;
 204
 205                     for (i = 0; i < nstreams; i++) {
 206                         int32_t v;
 207                         pa_volume_t cvolume = streams[i].volume.values[channel];
 208
 209                         if (d >= streams[i].chunk.length)
 210                             return d;
 211
 212                         if (cvolume == PA_VOLUME_MUTED)
 213                             v = 0;
 214                         else {
 215                             v = (int32_t) *((uint8_t*) streams[i].chunk.memblock->data + streams[i].chunk.index + d) - 0x80;
 216
 217                             if (cvolume != PA_VOLUME_NORM)
 218                                 v = (int32_t) (v * pa_sw_volume_to_linear(cvolume));
 219                         }
 220
 221                         sum += v;
 222                     }
 223
 224                     if (volume->values[channel] != PA_VOLUME_NORM)
 225                         sum = (int32_t) (sum * pa_sw_volume_to_linear(volume->values[channel]));
 226
 227                     if (sum < -0x80) sum = -0x80;
 228                     if (sum > 0x7F) sum = 0x7F;
 229
 230                 }
 231
 232                 *((uint8_t*) data) = (uint8_t) (sum + 0x80);
 233                 data = (uint8_t*) data + 1;
 234
 235                 if (++channel >= spec->channels)
 236                     channel = 0;
 237             }
 238         }
 239
 240         case PA_SAMPLE_FLOAT32NE: {
 241             size_t d;
 242             unsigned channel = 0;
 243
 244             for (d = 0;; d += sizeof(float)) {
 245                 float sum = 0;
 246
 247                 if (d >= length)
 248                     return d;
 249
 250                 if (!mute && volume->values[channel] != PA_VOLUME_MUTED) {
 251                     unsigned i;
 252
 253                     for (i = 0; i < nstreams; i++) {
 254                         float v;
 255                         pa_volume_t cvolume = streams[i].volume.values[channel];
 256
 257                         if (d >= streams[i].chunk.length)
 258                             return d;
 259
 260                         if (cvolume == PA_VOLUME_MUTED)
 261                             v = 0;
 262                         else {
 263                             v = *((float*) ((uint8_t*) streams[i].chunk.memblock->data + streams[i].chunk.index + d));
 264
 265                             if (cvolume != PA_VOLUME_NORM)
 266                                 v *= pa_sw_volume_to_linear(cvolume);
 267                         }
 268
 269                         sum += v;
 270                     }
 271
 272                     if (volume->values[channel] != PA_VOLUME_NORM)
 273                         sum *= pa_sw_volume_to_linear(volume->values[channel]);
 274                 }
 275
 276                 *((float*) data) = sum;
 277                 data = (uint8_t*) data + sizeof(float);
 278
 279                 if (++channel >= spec->channels)
 280                     channel = 0;
 281             }
 282         }
 283
 284         default:
 285             pa_log_error("ERROR: Unable to mix audio data of format %s.", pa_sample_format_to_string(spec->format));
 286             abort();
 287     }
 288 }
 289
 290
 291 void pa_volume_memchunk(pa_memchunk*c, const pa_sample_spec *spec, const pa_cvolume *volume) {
 292     assert(c && spec && (c->length % pa_frame_size(spec) == 0));
 293     assert(volume);
 294
 295     if (pa_cvolume_channels_equal_to(volume, PA_VOLUME_NORM))
 296         return;
 297
 298     if (pa_cvolume_channels_equal_to(volume, PA_VOLUME_MUTED)) {
 299         pa_silence_memchunk(c, spec);
 300         return;
 301     }
 302
 303     switch (spec->format) {
 304         case PA_SAMPLE_S16NE: {
 305             int16_t *d;
 306             size_t n;
 307             unsigned channel;
 308             double linear[PA_CHANNELS_MAX];
 309
 310             for (channel = 0; channel < spec->channels; channel++)
 311                 linear[channel] = pa_sw_volume_to_linear(volume->values[channel]);
 312
 313             for (channel = 0, d = (int16_t*) ((uint8_t*) c->memblock->data+c->index), n = c->length/sizeof(int16_t); n > 0; d++, n--) {
 314                 int32_t t = (int32_t)(*d);
 315
 316                 t = (int32_t) (t * linear[channel]);
 317
 318                 if (t < -0x8000) t = -0x8000;
 319                 if (t > 0x7FFF) t = 0x7FFF;
 320
 321                 *d = (int16_t) t;
 322
 323                 if (++channel >= spec->channels)
 324                     channel = 0;
 325             }
 326             break;
 327         }
 328
 329         case PA_SAMPLE_S16RE: {
 330             int16_t *d;
 331             size_t n;
 332             unsigned channel;
 333             double linear[PA_CHANNELS_MAX];
 334
 335             for (channel = 0; channel < spec->channels; channel++)
 336                 linear[channel] = pa_sw_volume_to_linear(volume->values[channel]);
 337
 338             for (channel = 0, d = (int16_t*) ((uint8_t*) c->memblock->data+c->index), n = c->length/sizeof(int16_t); n > 0; d++, n--) {
 339                 int32_t t = (int32_t)(INT16_SWAP(*d));
 340
 341                 t = (int32_t) (t * linear[channel]);
 342
 343                 if (t < -0x8000) t = -0x8000;
 344                 if (t > 0x7FFF) t = 0x7FFF;
 345
 346                 *d = INT16_SWAP((int16_t) t);
 347
 348                 if (++channel >= spec->channels)
 349                     channel = 0;
 350             }
 351
 352             break;
 353         }
 354
 355         case PA_SAMPLE_U8: {
 356             uint8_t *d;
 357             size_t n;
 358             unsigned channel = 0;
 359
 360             for (d = (uint8_t*) c->memblock->data + c->index, n = c->length; n > 0; d++, n--) {
 361                 int32_t t = (int32_t) *d - 0x80;
 362
 363                 t = (int32_t) (t * pa_sw_volume_to_linear(volume->values[channel]));
 364
 365                 if (t < -0x80) t = -0x80;
 366                 if (t > 0x7F) t = 0x7F;
 367
 368                 *d = (uint8_t) (t + 0x80);
 369
 370                 if (++channel >= spec->channels)
 371                     channel = 0;
 372             }
 373             break;
 374         }
 375
 376         case PA_SAMPLE_FLOAT32NE: {
 377             float *d;
 378             int skip;
 379             unsigned n;
 380             unsigned channel;
 381
 382             d = (float*) ((uint8_t*) c->memblock->data + c->index);
 383             skip = spec->channels * sizeof(float);
 384             n = c->length/sizeof(float)/spec->channels;
 385
 386             for (channel = 0; channel < spec->channels ; channel ++) {
 387                 float v, *t;
 388
 389                 if (volume->values[channel] == PA_VOLUME_NORM)
 390                     continue;
 391
 392                 v = (float) pa_sw_volume_to_linear(volume->values[channel]);
 393
 394                 t = d + channel;
 395                 oil_scalarmult_f32(t, skip, t, skip, &v, n);
 396             }
 397             break;
 398         }
 399
 400         default:
 401             pa_log_error("ERROR: Unable to change volume of format %s.",
 402                 pa_sample_format_to_string(spec->format));
 403             abort();
 404     }
 405 }
 406