cinelerra-5.1/cinelerra/audioodevice.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "audiodevice.h"
  23 #include "playbackconfig.h"
  24 #include "recordconfig.h"
  25 #include "bctimer.h"
  26 #include "condition.h"
  27 #include "mutex.h"
  28 #include "samples.h"
  29 #include "sema.h"
  30
  31 #include <string.h>
  32
  33 #define NO_DITHER 0
  34 #define DITHER dither()
  35
  36 // count of on bits
  37 inline static unsigned int on_bits(unsigned int n) {
  38   n = (n & 0x55555555) + ((n >> 1) & 0x55555555);
  39   n = (n & 0x33333333) + ((n >> 2) & 0x33333333);
  40   n = (n & 0x0f0f0f0f) + ((n >> 4) & 0x0f0f0f0f);
  41   n += n >> 8;  n += n >> 16;  //ok, fldsz > 5 bits
  42   return n & 0x1f;
  43 }
  44
  45 // assumes RAND_MAX is (2**n)-1 and n<=32 bits
  46 static int random_bits = on_bits(RAND_MAX);
  47 static int dither_random = 0;
  48 static long dither_bits = 0;
  49
  50 static inline int dither()
  51 {
  52         if( --dither_bits < 0 ) {
  53                 dither_random = random();
  54                 dither_bits = random_bits;
  55         }
  56         return (dither_random>>dither_bits) & 1;
  57 }
  58
  59 static inline int audio_clip(int64_t v, int mx)
  60 {
  61   if( v > mx ) return mx;
  62   if( v < -mx-1 ) return -mx-1;
  63   return v;
  64 }
  65
  66 #define FETCH1(m,dither) \
  67   audio_clip((output_channel[j]*gain)-dither, m)
  68
  69 #define FETCH51(m, dither) \
  70   audio_clip((gain*(center[j] + 2*front[j] + \
  71     2*back[j] + subwoof[j]))-dither, m)
  72
  73 #define PUT_8BIT_SAMPLES(n,dither) { \
  74   sample = FETCH##n(0x7f,dither); \
  75   *(int8_t*)&buffer[k] = sample; \
  76 }
  77
  78 #define PUT_16BIT_SAMPLES(n,dither) { \
  79   sample = FETCH##n(0x7fff,dither); \
  80   *(int16_t*)&buffer[k] = sample; \
  81 }
  82
  83 #define PUT_24BIT_SAMPLES(n,dither) { \
  84   sample = FETCH##n(0x7fffff,dither); \
  85   if( (k&1) ) { \
  86     *(int8_t*)&buffer[k] = sample; \
  87     *(int16_t*)&buffer[k+1] = (sample >> 8); \
  88   } else { \
  89     *(int16_t*)&buffer[k] = sample; \
  90     *(int8_t*)&buffer[k+2] = (sample >> 16); \
  91   } \
  92 }
  93
  94 #define PUT_32BIT_SAMPLES(n,dither) { \
  95   sample = FETCH##n(0x7fffffff,dither); \
  96   *(int32_t*)&buffer[k] = sample; \
  97 }
  98
  99 int AudioDevice::write_buffer(double **data,
 100         int channels, int samples, double bfr_time)
 101 {
 102 // find free buffer to fill
 103         if(playback_interrupted) return 0;
 104         int64_t sample_position = total_samples_written;
 105         total_samples_written += samples;
 106         int buffer_num = arm_buffer_num;
 107         if( ++arm_buffer_num >= TOTAL_AUDIO_BUFFERS ) arm_buffer_num = 0;
 108         arm_buffer(buffer_num, data, channels, samples,
 109                 sample_position, bfr_time);
 110         return 0;
 111 }
 112
 113 int AudioDevice::set_last_buffer()
 114 {
 115         output_buffer_t *obfr = &output[arm_buffer_num];
 116         if( !obfr ) return 0;
 117         if( ++arm_buffer_num >= TOTAL_AUDIO_BUFFERS ) arm_buffer_num = 0;
 118         obfr->arm_lock->lock("AudioDevice::set_last_buffer");
 119         obfr->last_buffer = 1;
 120         obfr->play_lock->unlock();
 121         return 0;
 122 }
 123
 124 // little endian byte order
 125 int AudioDevice::arm_buffer(int buffer_num, double **data, int channels,
 126         int samples, int64_t sample_position, double bfr_time)
 127 {
 128         if(!is_playing_back || playback_interrupted) return 1;
 129 // wait for buffer to become available for writing
 130         output_buffer_t *obfr = &output[buffer_num];
 131         obfr->arm_lock->lock("AudioDevice::arm_buffer");
 132         if(!is_playing_back || playback_interrupted) return 1;
 133
 134         int bits = get_obits();
 135         int device_channels = get_ochannels();
 136         int frame = device_channels * (bits / 8);
 137         int fragment_size = frame * samples;
 138         if( fragment_size > obfr->allocated ) {
 139                 delete [] obfr->buffer;
 140                 obfr->buffer = new char[fragment_size];
 141                 obfr->allocated = fragment_size;
 142         }
 143
 144         char *buffer = obfr->buffer;
 145         obfr->size = fragment_size;
 146         obfr->bfr_time = bfr_time;
 147         obfr->sample_position = sample_position;
 148         int map51_2 = out51_2 && channels == 6 && device_channels == 2;
 149         double gain = ((1u<<(bits-1))-1) * play_gain;
 150         if( map51_2 ) gain *= 0.2;
 151
 152         for( int och=0; och<device_channels; ++och ) {
 153                 int sample;
 154                 int k = och * bits / 8;
 155
 156                 if( map51_2 ) {
 157                         double *front = data[och];
 158                         double *center = data[2];
 159                         double *subwoof = data[3];
 160                         double *back = data[och+4];
 161                         if( play_dither ) {
 162                                 switch( bits ) {
 163                                 case 8: for( int j=0; j<samples; ++j,k+=frame )
 164                                                 PUT_8BIT_SAMPLES(51,DITHER)
 165                                         break;
 166                                 case 16: for( int j=0; j<samples; ++j,k+=frame )
 167                                                 PUT_16BIT_SAMPLES(51,DITHER)
 168                                         break;
 169                                 case 24: for( int j=0; j<samples; ++j,k+=frame )
 170                                                 PUT_24BIT_SAMPLES(51,DITHER)
 171                                         break;
 172                                 case 32: for( int j=0; j<samples; ++j,k+=frame )
 173                                                 PUT_32BIT_SAMPLES(51,DITHER)
 174                                         break;
 175                                 }
 176                         }
 177                         else {
 178                                 switch( bits ) {
 179                                 case 8: for( int j=0; j<samples; ++j,k+=frame )
 180                                                 PUT_8BIT_SAMPLES(51,NO_DITHER)
 181                                         break;
 182                                 case 16: for( int j=0; j<samples; ++j,k+=frame )
 183                                                 PUT_16BIT_SAMPLES(51,NO_DITHER)
 184                                         break;
 185                                 case 24: for( int j=0; j<samples; ++j,k+=frame )
 186                                                 PUT_24BIT_SAMPLES(51,NO_DITHER)
 187                                         break;
 188                                 case 32: for( int j=0; j<samples; ++j,k+=frame )
 189                                                 PUT_32BIT_SAMPLES(51,NO_DITHER)
 190                                         break;
 191                                 }
 192                         }
 193                 }
 194                 else {
 195                         double *output_channel = data[och % channels];
 196                         if( play_dither ) {
 197                                 switch( bits ) {
 198                                 case 8: for( int j=0; j<samples; ++j,k+=frame )
 199                                                 PUT_8BIT_SAMPLES(1,DITHER)
 200                                         break;
 201                                 case 16: for( int j=0; j<samples; ++j,k+=frame )
 202                                                 PUT_16BIT_SAMPLES(1,DITHER)
 203                                         break;
 204                                 case 24: for( int j=0; j<samples; ++j,k+=frame )
 205                                                 PUT_24BIT_SAMPLES(1,DITHER)
 206                                         break;
 207                                 case 32: for( int j=0; j<samples; ++j,k+=frame )
 208                                                 PUT_32BIT_SAMPLES(1,DITHER)
 209                                         break;
 210                                 }
 211                         }
 212                         else {
 213                                 switch( bits ) {
 214                                 case 8: for( int j=0; j<samples; ++j,k+=frame )
 215                                                 PUT_8BIT_SAMPLES(1,NO_DITHER)
 216                                         break;
 217                                 case 16: for( int j=0; j<samples; ++j,k+=frame )
 218                                                 PUT_16BIT_SAMPLES(1,NO_DITHER)
 219                                         break;
 220                                 case 24: for( int j=0; j<samples; ++j,k+=frame )
 221                                                 PUT_24BIT_SAMPLES(1,NO_DITHER)
 222                                         break;
 223                                 case 32: for( int j=0; j<samples; ++j,k+=frame )
 224                                                 PUT_32BIT_SAMPLES(1,NO_DITHER)
 225                                         break;
 226                                 }
 227                         }
 228                 }
 229         }
 230 // make buffer available for playback
 231         obfr->play_lock->unlock();
 232         return 0;
 233 }
 234
 235 void AudioDevice::end_output()
 236 {
 237         is_playing_back = 0;
 238         monitoring = 0;
 239         if( lowlevel_out )
 240                 lowlevel_out->interrupt_playback();
 241         for( int i=0; i<TOTAL_AUDIO_BUFFERS; ++i ) {
 242                 output_buffer_t *obfr = &output[i];
 243                 obfr->play_lock->unlock();
 244                 obfr->arm_lock->unlock();
 245         }
 246 }
 247
 248 int AudioDevice::reset_output()
 249 {
 250         for( int i=0; i<TOTAL_AUDIO_BUFFERS; ++i ) {
 251                 output_buffer_t *obfr = &output[i];
 252                 if( obfr->buffer ) {
 253                         delete [] obfr->buffer;
 254                         obfr->buffer = 0;
 255                 }
 256                 obfr->allocated = 0;
 257                 obfr->size = 0;
 258                 obfr->last_buffer = 0;
 259                 obfr->arm_lock->reset();
 260                 obfr->play_lock->reset();
 261         }
 262         is_playing_back = 0;
 263         playback_interrupted = 0;
 264         monitoring = 0;
 265         monitor_open = 0;
 266         output_buffer_num = 0;
 267         arm_buffer_num = 0;
 268         last_position = 0;
 269         return 0;
 270 }
 271
 272
 273 void AudioDevice::set_play_gain(double gain)
 274 {
 275         play_gain = gain * out_config->play_gain;
 276 }
 277
 278 void AudioDevice::set_play_dither(int status)
 279 {
 280         play_dither = status;
 281 }
 282
 283 void AudioDevice::set_software_positioning(int status)
 284 {
 285         software_position_info = status;
 286 }
 287
 288 int AudioDevice::start_playback()
 289 {
 290 // arm buffer before doing this
 291         is_playing_back = 1;
 292         playback_interrupted = 0;
 293         total_samples_written = 0;
 294         total_samples_output = 0;
 295 // zero timers
 296         playback_timer->update();
 297         last_position = 0;
 298 // start output thread
 299         audio_out = new AudioThread(this,
 300                 &AudioDevice::run_output,&AudioDevice::end_output);
 301         audio_out->set_realtime(get_orealtime());
 302         audio_out->startup();
 303         return 0;
 304 }
 305
 306 int AudioDevice::interrupt_playback()
 307 {
 308 //printf("AudioDevice::interrupt_playback\n");
 309         stop_output(0);
 310         return 0;
 311 }
 312
 313 int64_t AudioDevice::samples_output()
 314 {
 315         int64_t result = !lowlevel_out ? -1 : lowlevel_out->samples_output();
 316         if( result < 0 ) result = total_samples_output;
 317         return result;
 318 }
 319
 320
 321 int64_t AudioDevice::current_position()
 322 {
 323 // try to get OSS position
 324         int64_t result = 0;
 325
 326         if(w) {
 327                 int frame = (get_obits() * get_ochannels()) / 8;
 328                 if( !frame ) return 0;
 329
 330 // get hardware position
 331                 if(!software_position_info && lowlevel_out) {
 332                         result = lowlevel_out->device_position();
 333                         int64_t sample_count = samples_output();
 334                         if( result > sample_count )
 335                                 result = sample_count;
 336                 }
 337
 338 // get software position
 339                 if(result < 0 || software_position_info) {
 340                         timer_lock->lock("AudioDevice::current_position");
 341                         result = total_samples_output - device_buffer / frame;
 342                         result += playback_timer->get_scaled_difference(get_orate());
 343                         timer_lock->unlock();
 344                         int64_t sample_count = samples_output();
 345                         if( result > sample_count )
 346                                 result = sample_count;
 347                 }
 348
 349                 if(result < last_position)
 350                         result = last_position;
 351                 else
 352                         last_position = result;
 353
 354                 result -= (int64_t)(get_orate() * out_config->audio_offset);
 355
 356         }
 357         else if(r) {
 358                 result = total_samples_read +
 359                         record_timer->get_scaled_difference(get_irate());
 360         }
 361
 362         return result;
 363 }
 364
 365 void AudioDevice::run_output()
 366 {
 367         output_buffer_num = 0;
 368         playback_timer->update();
 369
 370 //printf("AudioDevice::run 1 %d\n", Thread::calculate_realtime());
 371         while( is_playing_back && !playback_interrupted ) {
 372 // wait for buffer to become available
 373                 int buffer_num = output_buffer_num;
 374                 if( ++output_buffer_num >= TOTAL_AUDIO_BUFFERS ) output_buffer_num = 0;
 375                 output_buffer_t *obfr = &output[buffer_num];
 376                 obfr->play_lock->lock("AudioDevice::run 1");
 377                 if( !is_playing_back || playback_interrupted ) break;
 378                 if( obfr->last_buffer ) { lowlevel_out->flush_device(); break; }
 379 // get size for position information
 380 // write converted buffer synchronously
 381                 double bfr_time = obfr->bfr_time;
 382                 int result = lowlevel_out->write_buffer(obfr->buffer, obfr->size);
 383 // allow writing to the buffer
 384                 obfr->arm_lock->unlock();
 385                 if( !result ) {
 386                         timer_lock->lock("AudioDevice::run 3");
 387                         int frame = get_ochannels() * get_obits() / 8;
 388                         int samples = frame ? obfr->size / frame : 0;
 389                         total_samples_output += samples;
 390                         last_buffer_time = bfr_time + (double)samples/out_samplerate;
 391                         playback_timer->update();
 392                         timer_lock->unlock();
 393                 }
 394 // inform user if the buffer write failed
 395                 else if( result < 0 ) {
 396                         perror("AudioDevice::write_buffer");
 397                         usleep(250000);
 398                 }
 399         }
 400
 401         is_playing_back = 0;
 402 }
 403
 404