firmware/pcm.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Michael Sevakis
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdlib.h>
  22 #include "system.h"
  23 #include "kernel.h"
  24
  25 /* Define LOGF_ENABLE to enable logf output in this file */
  26 /*#define LOGF_ENABLE*/
  27 #include "logf.h"
  28 #include "audio.h"
  29 #include "sound.h"
  30 #include "general.h"
  31
  32 /**
  33  * Aspects implemented in the target-specific portion:
  34  *
  35  * ==Playback==
  36  *   Public -
  37  *      pcm_postinit
  38  *      pcm_get_bytes_waiting
  39  *      pcm_play_lock
  40  *      pcm_play_unlock
  41  *   Semi-private -
  42  *      pcm_play_get_more_callback
  43  *      pcm_play_dma_init
  44  *      pcm_play_dma_start
  45  *      pcm_play_dma_stop
  46  *      pcm_play_dma_pause
  47  *      pcm_play_dma_get_peak_buffer
  48  *   Data Read/Written within TSP -
  49  *      pcm_sampr (R)
  50  *      pcm_fsel (R)
  51  *      pcm_curr_sampr (R)
  52  *      pcm_playing (R)
  53  *      pcm_paused (R)
  54  *
  55  * ==Playback/Recording==
  56  *   Public -
  57  *      pcm_dma_addr
  58  *   Semi-private -
  59  *      pcm_dma_apply_settings
  60  *
  61  * ==Recording==
  62  *   Public -
  63  *      pcm_rec_lock
  64  *      pcm_rec_unlock
  65  *   Semi-private -
  66  *      pcm_rec_more_ready_callback
  67  *      pcm_rec_dma_init
  68  *      pcm_rec_dma_close
  69  *      pcm_rec_dma_start
  70  *      pcm_rec_dma_stop
  71  *      pcm_rec_dma_get_peak_buffer
  72  *   Data Read/Written within TSP -
  73  *      pcm_recording (R)
  74  *
  75  * States are set _after_ the target's pcm driver is called so that it may
  76  * know from whence the state is changed. One exception is init.
  77  *
  78  */
  79
  80 /* the registered callback function to ask for more mp3 data */
  81 static volatile pcm_play_callback_type pcm_callback_for_more
  82     SHAREDBSS_ATTR = NULL;
  83 /* PCM playback state */
  84 volatile bool pcm_playing SHAREDBSS_ATTR = false;
  85 /* PCM paused state. paused implies playing */
  86 volatile bool pcm_paused SHAREDBSS_ATTR = false;
  87 /* samplerate of currently playing audio - undefined if stopped */
  88 unsigned long pcm_curr_sampr SHAREDBSS_ATTR = 0;
  89 /* samplerate waiting to be set */
  90 unsigned long pcm_sampr SHAREDBSS_ATTR = HW_SAMPR_DEFAULT;
  91 /* samplerate frequency selection index */
  92 int pcm_fsel SHAREDBSS_ATTR = HW_FREQ_DEFAULT;
  93
  94 /* Called internally by functions to reset the state */
  95 static void pcm_play_stopped(void)
  96 {
  97     pcm_callback_for_more = NULL;
  98     pcm_paused = false;
  99     pcm_playing = false;
 100 }
 101
 102 /**
 103  * Perform peak calculation on a buffer of packed 16-bit samples.
 104  *
 105  * Used for recording and playback.
 106  */
 107 static void pcm_peak_peeker(const int32_t *addr, int count, int peaks[2])
 108 {
 109     int peak_l = 0, peak_r = 0;
 110     const int32_t * const end = addr + count;
 111
 112     do
 113     {
 114         int32_t value = *addr;
 115         int ch;
 116
 117 #ifdef ROCKBOX_BIG_ENDIAN
 118         ch = value >> 16;
 119 #else
 120         ch = (int16_t)value;
 121 #endif
 122         if (ch < 0)
 123             ch = -ch;
 124         if (ch > peak_l)
 125             peak_l = ch;
 126
 127 #ifdef ROCKBOX_BIG_ENDIAN
 128         ch = (int16_t)value;
 129 #else
 130         ch = value >> 16;
 131 #endif
 132         if (ch < 0)
 133             ch = -ch;
 134         if (ch > peak_r)
 135             peak_r = ch;
 136
 137         addr += 4;
 138     }
 139     while (addr < end);
 140
 141     peaks[0] = peak_l;
 142     peaks[1] = peak_r;
 143 }
 144
 145 void pcm_calculate_peaks(int *left, int *right)
 146 {
 147     static int peaks[2] = { 0, 0 };
 148     static unsigned long last_peak_tick = 0;
 149     static unsigned long frame_period   = 0;
 150
 151     long tick = current_tick;
 152     int count;
 153     const void *addr;
 154
 155     /* Throttled peak ahead based on calling period */
 156     long period = tick - last_peak_tick;
 157
 158     /* Keep reasonable limits on period */
 159     if (period < 1)
 160         period = 1;
 161     else if (period > HZ/5)
 162         period = HZ/5;
 163
 164     frame_period = (3*frame_period + period) >> 2;
 165
 166     last_peak_tick = tick;
 167
 168     addr = pcm_play_dma_get_peak_buffer(&count);
 169
 170     if (pcm_playing && !pcm_paused)
 171     {
 172         int framecount;
 173
 174         framecount = frame_period*pcm_curr_sampr / HZ;
 175         count = MIN(framecount, count);
 176
 177         if (count > 0)
 178             pcm_peak_peeker((int32_t *)addr, count, peaks);
 179         /* else keep previous peak values */
 180     }
 181     else
 182     {
 183         peaks[0] = peaks[1] = 0;
 184     }
 185
 186     if (left)
 187         *left = peaks[0];
 188
 189     if (right)
 190         *right = peaks[1];
 191 }
 192
 193 const void* pcm_get_peak_buffer(int * count)
 194 {
 195     return pcm_play_dma_get_peak_buffer(count);
 196 }
 197
 198 bool pcm_is_playing(void)
 199 {
 200     return pcm_playing;
 201 }
 202
 203 bool pcm_is_paused(void)
 204 {
 205     return pcm_paused;
 206 }
 207
 208 /****************************************************************************
 209  * Functions that do not require targeted implementation but only a targeted
 210  * interface
 211  */
 212
 213 /* This should only be called at startup before any audio playback or
 214    recording is attempted */
 215 void pcm_init(void)
 216 {
 217     logf("pcm_init");
 218
 219     pcm_play_stopped();
 220
 221     pcm_set_frequency(HW_SAMPR_DEFAULT);
 222
 223     logf(" pcm_play_dma_init");
 224     pcm_play_dma_init();
 225 }
 226
 227 /* Common code to pcm_play_data and pcm_play_pause */
 228 static void pcm_play_data_start(unsigned char *start, size_t size)
 229 {
 230     start = (unsigned char *)(((uintptr_t)start + 3) & ~3);
 231     size &= ~3;
 232
 233     if (!(start && size))
 234     {
 235         pcm_play_callback_type get_more = pcm_callback_for_more;
 236         size = 0;
 237         if (get_more)
 238         {
 239             logf(" get_more");
 240             get_more(&start, &size);
 241
 242             start = (unsigned char *)(((uintptr_t)start + 3) & ~3);
 243             size &= ~3;
 244         }
 245     }
 246
 247     if (start && size)
 248     {
 249         logf(" pcm_play_dma_start");
 250         pcm_apply_settings();
 251         pcm_play_dma_start(start, size);
 252         pcm_playing = true;
 253         pcm_paused = false;
 254         return;
 255     }
 256
 257     /* Force a stop */
 258     logf(" pcm_play_dma_stop");
 259     pcm_play_dma_stop();
 260     pcm_play_stopped();
 261 }
 262
 263 void pcm_play_data(pcm_play_callback_type get_more,
 264                    unsigned char *start, size_t size)
 265 {
 266     logf("pcm_play_data");
 267
 268     pcm_play_lock();
 269
 270     pcm_callback_for_more = get_more;
 271
 272     logf(" pcm_play_data_start");
 273     pcm_play_data_start(start, size);
 274
 275     pcm_play_unlock();
 276 }
 277
 278 void pcm_play_get_more_callback(void **start, size_t *size)
 279 {
 280     pcm_play_callback_type get_more = pcm_callback_for_more;
 281
 282     *size = 0;
 283
 284     if (get_more && start)
 285     {
 286         /* Call registered callback */
 287         get_more((unsigned char **)start, size);
 288
 289         *start = (void *)(((uintptr_t)*start + 3) & ~3);
 290         *size &= ~3;
 291
 292         if (*start && *size)
 293             return;
 294     }
 295
 296     /* Error, callback missing or no more DMA to do */
 297     pcm_play_dma_stop();
 298     pcm_play_stopped();
 299 }
 300
 301 void pcm_play_pause(bool play)
 302 {
 303     logf("pcm_play_pause: %s", play ? "play" : "pause");
 304
 305     pcm_play_lock();
 306
 307     if (play == pcm_paused && pcm_playing)
 308     {
 309         if (!play)
 310         {
 311             logf(" pcm_play_dma_pause");
 312             pcm_play_dma_pause(true);
 313             pcm_paused = true;
 314         }
 315         else if (pcm_get_bytes_waiting() > 0)
 316         {
 317             logf(" pcm_play_dma_pause");
 318             pcm_apply_settings();
 319             pcm_play_dma_pause(false);
 320             pcm_paused = false;
 321         }
 322         else
 323         {
 324             logf(" pcm_play_dma_start: no data");
 325             pcm_play_data_start(NULL, 0);
 326         }
 327     }
 328     else
 329     {
 330         logf(" no change");
 331     }
 332
 333     pcm_play_unlock();
 334 }
 335
 336 void pcm_play_stop(void)
 337 {
 338     logf("pcm_play_stop");
 339
 340     pcm_play_lock();
 341
 342     if (pcm_playing)
 343     {
 344         logf(" pcm_play_dma_stop");
 345         pcm_play_dma_stop();
 346         pcm_play_stopped();
 347     }
 348     else
 349     {
 350         logf(" not playing");
 351     }
 352
 353     pcm_play_unlock();
 354 }
 355
 356 /**/
 357
 358 /* set frequency next frequency used by the audio hardware -
 359  * what pcm_apply_settings will set */
 360 void pcm_set_frequency(unsigned int samplerate)
 361 {
 362     logf("pcm_set_frequency");
 363
 364     int index = round_value_to_list32(samplerate, hw_freq_sampr,
 365                                       HW_NUM_FREQ, false);
 366
 367     if (samplerate != hw_freq_sampr[index])
 368         index = HW_FREQ_DEFAULT; /* Invalid = default */
 369
 370     pcm_sampr = hw_freq_sampr[index];
 371     pcm_fsel = index;
 372 }
 373
 374 /* apply pcm settings to the hardware */
 375 void pcm_apply_settings(void)
 376 {
 377     logf("pcm_apply_settings");
 378
 379     if (pcm_sampr != pcm_curr_sampr)
 380     {
 381         logf(" pcm_dma_apply_settings");
 382         pcm_dma_apply_settings();
 383         pcm_curr_sampr = pcm_sampr;
 384     }
 385 }
 386
 387 #ifdef HAVE_RECORDING
 388 /** Low level pcm recording apis **/
 389
 390 /* Next start for recording peaks */
 391 static const void * volatile pcm_rec_peak_addr SHAREDBSS_ATTR = NULL;
 392 /* the registered callback function for when more data is available */
 393 static volatile pcm_rec_callback_type
 394     pcm_callback_more_ready SHAREDBSS_ATTR = NULL;
 395 /* DMA transfer in is currently active */
 396 volatile bool pcm_recording SHAREDBSS_ATTR = false;
 397
 398 /* Called internally by functions to reset the state */
 399 static void pcm_recording_stopped(void)
 400 {
 401     pcm_recording = false;
 402     pcm_callback_more_ready = NULL;
 403 }
 404
 405 /**
 406  * Return recording peaks - From the end of the last peak up to
 407  *                          current write position.
 408  */
 409 void pcm_calculate_rec_peaks(int *left, int *right)
 410 {
 411     static int peaks[2];
 412
 413     if (pcm_recording)
 414     {
 415         const void *peak_addr = pcm_rec_peak_addr;
 416         const void *addr = pcm_rec_dma_get_peak_buffer();
 417
 418         if (addr != NULL)
 419         {
 420             int count = (int)(((intptr_t)addr - (intptr_t)peak_addr) >> 2);
 421
 422             if (count > 0)
 423             {
 424                 pcm_peak_peeker((int32_t *)peak_addr, count, peaks);
 425
 426                 if (peak_addr == pcm_rec_peak_addr)
 427                     pcm_rec_peak_addr = addr;
 428             }
 429         }
 430         /* else keep previous peak values */
 431     }
 432     else
 433     {
 434         peaks[0] = peaks[1] = 0;
 435     }
 436
 437     if (left)
 438         *left = peaks[0];
 439
 440     if (right)
 441         *right = peaks[1];
 442 } /* pcm_calculate_rec_peaks */
 443
 444 bool pcm_is_recording(void)
 445 {
 446     return pcm_recording;
 447 }
 448
 449 /****************************************************************************
 450  * Functions that do not require targeted implementation but only a targeted
 451  * interface
 452  */
 453
 454 void pcm_init_recording(void)
 455 {
 456     logf("pcm_init_recording");
 457
 458     /* Recording init is locked unlike general pcm init since this is not
 459      * just a one-time event at startup and it should and must be safe by
 460      * now. */
 461     pcm_rec_lock();
 462
 463     logf(" pcm_rec_dma_init");
 464     pcm_recording_stopped();
 465     pcm_rec_dma_init();
 466
 467     pcm_rec_unlock();
 468 }
 469
 470 void pcm_close_recording(void)
 471 {
 472     logf("pcm_close_recording");
 473
 474     pcm_rec_lock();
 475
 476     if (pcm_recording)
 477     {
 478         logf(" pcm_rec_dma_stop");
 479         pcm_rec_dma_stop();
 480         pcm_recording_stopped();
 481     }
 482
 483     logf(" pcm_rec_dma_close");
 484     pcm_rec_dma_close();
 485
 486     pcm_rec_unlock();
 487 }
 488
 489 void pcm_record_data(pcm_rec_callback_type more_ready,
 490                      void *start, size_t size)
 491 {
 492     logf("pcm_record_data");
 493
 494     /* 32-bit aligned and sized data only */
 495     start = (void *)(((uintptr_t)start + 3) & ~3);
 496     size &= ~3;
 497
 498     if (!(start && size))
 499     {
 500         logf(" no buffer");
 501         return;
 502     }
 503
 504     pcm_rec_lock();
 505
 506     pcm_callback_more_ready = more_ready;
 507
 508 #ifdef HAVE_PCM_REC_DMA_ADDRESS
 509     /* Need a physical DMA address translation, if not already physical. */
 510     pcm_rec_peak_addr = pcm_dma_addr(start);
 511 #else
 512     pcm_rec_peak_addr = start;
 513 #endif
 514
 515     logf(" pcm_rec_dma_start");
 516     pcm_apply_settings();
 517     pcm_rec_dma_start(start, size);
 518     pcm_recording = true;
 519
 520     pcm_rec_unlock();
 521 } /* pcm_record_data */
 522
 523 void pcm_stop_recording(void)
 524 {
 525     logf("pcm_stop_recording");
 526
 527     pcm_rec_lock();
 528
 529     if (pcm_recording)
 530     {
 531         logf(" pcm_rec_dma_stop");
 532         pcm_rec_dma_stop();
 533         pcm_recording_stopped();
 534     }
 535
 536     pcm_rec_unlock();
 537 } /* pcm_stop_recording */
 538
 539 void pcm_rec_more_ready_callback(int status, void **start, size_t *size)
 540 {
 541     pcm_rec_callback_type have_more = pcm_callback_more_ready;
 542
 543     *size = 0;
 544
 545     if (have_more && start)
 546     {
 547         have_more(status, start, size);
 548         *start = (void *)(((uintptr_t)*start + 3) & ~3);
 549         *size &= ~3;
 550
 551         if (*start && *size)
 552         {
 553         #ifdef HAVE_PCM_REC_DMA_ADDRESS
 554             /* Need a physical DMA address translation, if not already
 555              * physical. */
 556             pcm_rec_peak_addr = pcm_dma_addr(*start);
 557         #else
 558             pcm_rec_peak_addr = *start;
 559         #endif
 560             return;
 561         }
 562     }
 563
 564     /* Error, callback missing or no more DMA to do */
 565     pcm_rec_dma_stop();
 566     pcm_recording_stopped();
 567 }
 568
 569 #endif /* HAVE_RECORDING */