apps/codecs/spc.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007-2008 Michael Sevakis (jhMikeS)
  11  * Copyright (C) 2006-2007 Adam Gashlin (hcs)
  12  * Copyright (C) 2004-2007 Shay Green (blargg)
  13  * Copyright (C) 2002 Brad Martin
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  21  * KIND, either express or implied.
  22  *
  23  ****************************************************************************/
  24
  25 /* lovingly ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */
  26 /* DSP Based on Brad Martin's OpenSPC DSP emulator */
  27 /* tag reading from sexyspc by John Brawn (John_Brawn@yahoo.com) and others */
  28 #include "codeclib.h"
  29 #include "../fracmul.h"
  30 #include "libspc/spc_codec.h"
  31 #include "libspc/spc_profiler.h"
  32
  33 CODEC_HEADER
  34
  35 /**************** ID666 parsing ****************/
  36
  37 struct {
  38     unsigned char isBinary;
  39     char song[32];
  40     char game[32];
  41     char dumper[16];
  42     char comments[32];
  43     int day,month,year;
  44     unsigned long length;
  45     unsigned long fade;
  46     char artist[32];
  47     unsigned char muted;
  48     unsigned char emulator;
  49 } ID666;
  50
  51 static int LoadID666(unsigned char *buf) {
  52     unsigned char *ib=buf;
  53     int isbinary = 1;
  54     int i;
  55
  56     memcpy(ID666.song,ib,32);
  57     ID666.song[31]=0;
  58     ib+=32;
  59
  60     memcpy(ID666.game,ib,32);
  61     ID666.game[31]=0;
  62     ib+=32;
  63
  64     memcpy(ID666.dumper,ib,16);
  65     ID666.dumper[15]=0;
  66     ib+=16;
  67
  68     memcpy(ID666.comments,ib,32);
  69     ID666.comments[31]=0;
  70     ib+=32;
  71
  72     /* Ok, now comes the fun part. */
  73
  74     /* Date check */
  75     if(ib[2] == '/'  && ib[5] == '/' )
  76         isbinary = 0;
  77
  78     /* Reserved bytes check */
  79     if(ib[0xD2 - 0x2E - 112] >= '0' &&
  80        ib[0xD2 - 0x2E - 112] <= '9' &&
  81        ib[0xD3 - 0x2E - 112] == 0x00)
  82         isbinary = 0;
  83
  84     /* is length & fade only digits? */
  85     for (i=0;i<8 && (
  86         (ib[0xA9 - 0x2E - 112+i]>='0'&&ib[0xA9 - 0x2E - 112+i]<='9') ||
  87         ib[0xA9 - 0x2E - 112+i]=='\0');
  88         i++);
  89     if (i==8) isbinary=0;
  90
  91     ID666.isBinary = isbinary;
  92
  93     if(isbinary) {
  94         DEBUGF("binary tag detected\n");
  95         ID666.year=*ib;
  96         ib++;
  97         ID666.year|=*ib<<8;
  98         ib++;
  99         ID666.month=*ib;
 100         ib++;
 101         ID666.day=*ib;
 102         ib++;
 103
 104         ib+=7;
 105
 106         ID666.length=*ib;
 107         ib++;
 108
 109         ID666.length|=*ib<<8;
 110         ib++;
 111
 112         ID666.length|=*ib<<16;
 113         ID666.length*=1000;
 114         ib++;
 115
 116         ID666.fade=*ib;
 117         ib++;
 118         ID666.fade|=*ib<<8;
 119         ib++;
 120         ID666.fade|=*ib<<16;
 121         ib++;
 122         ID666.fade|=*ib<<24;
 123         ib++;
 124
 125         memcpy(ID666.artist,ib,32);
 126         ID666.artist[31]=0;
 127         ib+=32;
 128
 129         ID666.muted=*ib;
 130         ib++;
 131
 132         ID666.emulator=*ib;
 133         ib++;
 134     } else {
 135         unsigned long tmp;
 136         char buf[64];
 137
 138         DEBUGF("text tag detected\n");
 139
 140         memcpy(buf, ib, 2);
 141         buf[2] = 0;
 142         tmp = 0;
 143         for (i=0;i<2 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
 144         ID666.month = tmp;
 145         ib+=3;
 146
 147         memcpy(buf, ib, 2);
 148         buf[2] = 0;
 149         tmp = 0;
 150         for (i=0;i<2 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
 151         ID666.day = tmp;
 152         ib+=3;
 153
 154         memcpy(buf, ib, 4);
 155         buf[4] = 0;
 156         tmp = 0;
 157         for (i=0;i<4 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
 158         ID666.year = tmp;
 159         ib+=5;
 160
 161         memcpy(buf, ib, 3);
 162         buf[3] = 0;
 163         tmp = 0;
 164         for (i=0;i<3 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
 165         ID666.length = tmp * 1000;
 166         ib+=3;
 167
 168         memcpy(buf, ib, 5);
 169         buf[5] = 0;
 170         tmp = 0;
 171         for (i=0;i<5 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
 172         ID666.fade = tmp;
 173         ib+=5;
 174
 175         memcpy(ID666.artist,ib,32);
 176         ID666.artist[31]=0;
 177         ib+=32;
 178
 179         /*I have no idea if this is right or not.*/
 180         ID666.muted=*ib;
 181         ib++;
 182
 183         memcpy(buf, ib, 1);
 184         buf[1] = 0;
 185         tmp = 0;
 186         ib++;
 187     }
 188     return 1;
 189 }
 190
 191 /**************** Codec ****************/
 192 enum {SAMPLE_RATE = 32000};
 193 static struct Spc_Emu spc_emu IDATA_ATTR CACHEALIGN_ATTR;
 194
 195 #if SPC_DUAL_CORE
 196 /** Implementations for pipelined dual-core operation **/
 197 static int spc_emu_thread_stack[DEFAULT_STACK_SIZE/sizeof(int)]
 198     CACHEALIGN_ATTR;
 199
 200 static const unsigned char * const spc_emu_thread_name = "spc emu";
 201 static unsigned int emu_thread_id = 0;
 202
 203 enum
 204 {
 205     SPC_EMU_AUDIO = 0,
 206     SPC_EMU_LOAD,
 207     SPC_EMU_QUIT,
 208 };
 209
 210 struct spc_load
 211 {
 212     uint8_t *buf;
 213     size_t size;
 214 };
 215
 216 /* sample queue */
 217 #define WAV_NUM_CHUNKS 2
 218 #define WAV_CHUNK_MASK (WAV_NUM_CHUNKS-1)
 219 struct sample_queue_chunk
 220 {
 221     long id;
 222     union
 223     {
 224         intptr_t data;
 225         int32_t audio[WAV_CHUNK_SIZE*2];
 226     };
 227 };
 228
 229 static struct
 230 {
 231     int head, tail;
 232     struct semaphore emu_sem_head;
 233     struct semaphore emu_sem_tail;
 234     struct semaphore emu_evt_reply;
 235     intptr_t retval;
 236     struct sample_queue_chunk wav_chunk[WAV_NUM_CHUNKS];
 237 } sample_queue SHAREDBSS_ATTR;
 238
 239 static inline void samples_release_wrbuf(void)
 240 {
 241     sample_queue.tail++;
 242     ci->semaphore_release(&sample_queue.emu_sem_head);
 243 }
 244
 245 static inline struct sample_queue_chunk * samples_get_wrbuf(void)
 246 {
 247     ci->semaphore_wait(&sample_queue.emu_sem_tail, TIMEOUT_BLOCK);
 248     return &sample_queue.wav_chunk[sample_queue.tail & WAV_CHUNK_MASK];
 249 }
 250
 251 static inline void samples_release_rdbuf(void)
 252 {
 253     if (sample_queue.head != sample_queue.tail) {
 254         sample_queue.head++;
 255     }
 256
 257     ci->semaphore_release(&sample_queue.emu_sem_tail);
 258 }
 259
 260 static inline int32_t * samples_get_rdbuf(void)
 261 {
 262     ci->semaphore_wait(&sample_queue.emu_sem_head, TIMEOUT_BLOCK);
 263     return sample_queue.wav_chunk[sample_queue.head & WAV_CHUNK_MASK].audio;
 264 }
 265
 266 static intptr_t emu_thread_send_msg(long id, intptr_t data)
 267 {
 268     struct sample_queue_chunk *chunk;
 269     /* Grab an audio output buffer */
 270     ci->semaphore_wait(&sample_queue.emu_sem_head, TIMEOUT_BLOCK);
 271     chunk = &sample_queue.wav_chunk[sample_queue.head & WAV_CHUNK_MASK];
 272     /* Place a message in it instead of audio */
 273     chunk->id = id;
 274     chunk->data = data;
 275     /* Release it to the emu thread */
 276     samples_release_rdbuf();
 277
 278     if (id != SPC_EMU_QUIT) {
 279         /* Wait for a response */
 280         ci->semaphore_wait(&sample_queue.emu_evt_reply, TIMEOUT_BLOCK);
 281     }
 282
 283     return sample_queue.retval;
 284 }
 285
 286 /* thread function */
 287 static bool emu_thread_process_msg(struct sample_queue_chunk *chunk)
 288 {
 289     long id = chunk->id;
 290     bool ret = id != SPC_EMU_QUIT;
 291
 292     chunk->id = SPC_EMU_AUDIO; /* Reset chunk type to audio */
 293     sample_queue.retval = 0;
 294
 295     if (id == SPC_EMU_LOAD)
 296     {
 297         struct spc_load *ld = (struct spc_load *)chunk->data;
 298         ci->cpucache_invalidate();
 299         SPC_Init(&spc_emu);
 300         sample_queue.retval = SPC_load_spc(&spc_emu, ld->buf, ld->size);
 301
 302         /* Empty the audio queue */
 303         ci->semaphore_release(&sample_queue.emu_sem_tail);
 304         ci->semaphore_release(&sample_queue.emu_sem_tail);
 305         ci->semaphore_wait(&sample_queue.emu_sem_head, TIMEOUT_NOBLOCK);
 306         ci->semaphore_wait(&sample_queue.emu_sem_head, TIMEOUT_NOBLOCK);
 307         sample_queue.head = sample_queue.tail = 0;
 308     }
 309
 310     if (id != SPC_EMU_QUIT) {
 311         ci->semaphore_release(&sample_queue.emu_evt_reply);
 312     }
 313
 314     return ret;
 315 }
 316
 317 static void spc_emu_thread(void)
 318 {
 319     CPU_Init(&spc_emu);
 320
 321     while (1) {
 322         /* get a buffer for output */
 323         struct sample_queue_chunk *chunk = samples_get_wrbuf();
 324
 325         if (chunk->id != SPC_EMU_AUDIO) {
 326             /* This chunk doesn't contain audio but a command */
 327             if (!emu_thread_process_msg(chunk))
 328                 break;
 329             /* Have to re-get this pointer to keep semaphore counts correct */
 330             continue;
 331         }
 332
 333         ENTER_TIMER(render);
 334         /* fill samples buffer */
 335         if ( SPC_play(&spc_emu, WAV_CHUNK_SIZE*2, chunk->audio) )
 336             assert( false );
 337         EXIT_TIMER(render);
 338
 339         /* done so release it to output */
 340         samples_release_wrbuf();
 341         ci->yield();
 342     }
 343 }
 344
 345 static bool spc_emu_start(void)
 346 {
 347     emu_thread_id = ci->create_thread(spc_emu_thread, spc_emu_thread_stack,
 348                            sizeof(spc_emu_thread_stack), CREATE_THREAD_FROZEN,
 349                            spc_emu_thread_name IF_PRIO(, PRIORITY_PLAYBACK), COP);
 350
 351     if (emu_thread_id == 0)
 352         return false;
 353
 354     /* Initialize audio queue as full to prevent emu thread from trying to run the
 355        emulator before loading something */
 356     ci->semaphore_init(&sample_queue.emu_evt_reply, 1, 0);
 357     ci->semaphore_init(&sample_queue.emu_sem_tail, 2, 0);
 358     ci->semaphore_init(&sample_queue.emu_sem_head, 2, 2);
 359     sample_queue.head = 0;
 360     sample_queue.tail = 2;
 361
 362     /* Start it running */
 363     ci->thread_thaw(emu_thread_id);
 364     return true;
 365 }
 366
 367 /* load a new program on the emu thread */
 368 static inline int load_spc_buffer(uint8_t *buf, size_t size)
 369 {
 370     struct spc_load ld = { buf, size };
 371     ci->cpucache_flush();
 372     return emu_thread_send_msg(SPC_EMU_LOAD, (intptr_t)&ld);
 373 }
 374
 375 static inline void spc_emu_quit(void)
 376 {
 377     if (emu_thread_id != 0) {
 378         emu_thread_send_msg(SPC_EMU_QUIT, 0);
 379         /* Wait for emu thread to be killed */
 380         ci->thread_wait(emu_thread_id);
 381         ci->cpucache_invalidate();
 382     }
 383 }
 384
 385 static inline int32_t * spc_play_get_samples(void)
 386 {
 387     /* obtain filled samples buffer */
 388     return samples_get_rdbuf();
 389 }
 390
 391 static inline void spc_play_send_samples(int32_t *samples)
 392 {
 393     ci->pcmbuf_insert(samples, samples+WAV_CHUNK_SIZE, WAV_CHUNK_SIZE);
 394     /* done with chunk so release it to emu thread */
 395     samples_release_rdbuf();
 396 }
 397
 398 #else /* !SPC_DUAL_CORE */
 399 /** Implementations for single-core operation **/
 400 int32_t wav_chunk[WAV_CHUNK_SIZE*2] IBSS_ATTR;
 401
 402 /* load a new program into emu */
 403 static inline int load_spc_buffer(uint8_t *buf, size_t size)
 404 {
 405     SPC_Init(&spc_emu);
 406     return SPC_load_spc(&spc_emu, buf, size);
 407 }
 408
 409 static inline bool spc_emu_start(void)
 410 {
 411 #ifdef CPU_COLDFIRE
 412     /* signed integer mode with saturation */
 413     coldfire_set_macsr(EMAC_SATURATE);
 414 #endif
 415     CPU_Init(&spc_emu);
 416     return true;
 417 }
 418
 419 static inline void spc_play_send_samples(int32_t *samples)
 420 {
 421     ci->pcmbuf_insert(samples, samples+WAV_CHUNK_SIZE, WAV_CHUNK_SIZE);
 422 }
 423
 424 #define spc_emu_quit()
 425 #define samples_release_rdbuf()
 426
 427 static inline int32_t * spc_play_get_samples(void)
 428 {
 429     ENTER_TIMER(render);
 430     /* fill samples buffer */
 431     if ( SPC_play(&spc_emu,WAV_CHUNK_SIZE*2,wav_chunk) )
 432         assert( false );
 433     EXIT_TIMER(render);
 434     return wav_chunk;
 435 }
 436 #endif /* SPC_DUAL_CORE */
 437
 438 /* The main decoder loop */
 439 static int play_track( void )
 440 {
 441     int sampleswritten=0;
 442
 443     unsigned long fadestartsample = ID666.length*(long long) SAMPLE_RATE/1000;
 444     unsigned long fadeendsample = (ID666.length+ID666.fade)*(long long) SAMPLE_RATE/1000;
 445     int fadedec = 0;
 446     int fadevol = 0x7fffffffl;
 447     intptr_t param;
 448
 449     if (fadeendsample>fadestartsample)
 450         fadedec=0x7fffffffl/(fadeendsample-fadestartsample)+1;
 451
 452     ENTER_TIMER(total);
 453
 454     while ( 1 )
 455     {
 456         enum codec_command_action action = ci->get_command(&param);
 457
 458         if (action == CODEC_ACTION_HALT)
 459             break;
 460
 461         if (action == CODEC_ACTION_SEEK_TIME) {
 462             int curtime = sampleswritten*1000LL/SAMPLE_RATE;
 463             DEBUGF("seek to %ld\ncurrently at %d\n", (long)param, curtime);
 464             if (param < curtime) {
 465                 DEBUGF("seek backwards = reset\n");
 466                 ci->set_elapsed(0);
 467                 ci->seek_complete();
 468                 return 1;
 469             }
 470
 471             ci->set_elapsed(curtime);
 472             ci->seek_complete();
 473         }
 474
 475         int32_t *samples = spc_play_get_samples();
 476
 477         sampleswritten += WAV_CHUNK_SIZE;
 478
 479         /* is track timed? */
 480         if (ci->global_settings->repeat_mode!=REPEAT_ONE && ci->id3->length) {
 481             unsigned long curtime = sampleswritten*1000LL/SAMPLE_RATE;
 482             unsigned long lasttimesample = (sampleswritten-WAV_CHUNK_SIZE);
 483
 484             /* fade? */
 485             if (curtime>ID666.length)
 486             {
 487             #ifdef CPU_COLDFIRE
 488                 /* Have to switch modes to do this */
 489                 long macsr = coldfire_get_macsr();
 490                 coldfire_set_macsr(EMAC_SATURATE | EMAC_FRACTIONAL | EMAC_ROUND);
 491             #endif
 492                 int i;
 493                 for (i=0;i<WAV_CHUNK_SIZE;i++) {
 494                     if (lasttimesample+i>fadestartsample) {
 495                         if (fadevol>0) {
 496                             samples[i] = FRACMUL(samples[i], fadevol);
 497                             samples[i+WAV_CHUNK_SIZE] = FRACMUL(samples[i+WAV_CHUNK_SIZE], fadevol);
 498                         } else samples[i]=samples[i+WAV_CHUNK_SIZE]=0;
 499                         fadevol-=fadedec;
 500                     }
 501                 }
 502             #ifdef CPU_COLDFIRE
 503                coldfire_set_macsr(macsr);
 504             #endif
 505             }
 506             /* end? */
 507             if (lasttimesample>=fadeendsample)
 508             {
 509                 samples_release_rdbuf();
 510                 break;
 511             }
 512         }
 513
 514         spc_play_send_samples(samples);
 515
 516         if (ci->global_settings->repeat_mode!=REPEAT_ONE)
 517             ci->set_elapsed(sampleswritten*1000LL/SAMPLE_RATE);
 518         else
 519             ci->set_elapsed(0);
 520     }
 521
 522     EXIT_TIMER(total);
 523     return 0;
 524 }
 525
 526 /* this is the codec entry point */
 527 enum codec_status codec_main(enum codec_entry_call_reason reason)
 528 {
 529     if (reason == CODEC_LOAD) {
 530         if (!spc_emu_start())
 531             return CODEC_ERROR;
 532
 533         ci->configure(DSP_SET_SAMPLE_DEPTH, 24);
 534         ci->configure(DSP_SET_FREQUENCY, SAMPLE_RATE);
 535         ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
 536     }
 537     else if (reason == CODEC_UNLOAD) {
 538         spc_emu_quit();
 539     }
 540
 541     return CODEC_OK;
 542 }
 543
 544 /* this is called for each file to process */
 545 enum codec_status codec_run(void)
 546 {
 547     DEBUGF("SPC: next_track\n");
 548     if (codec_init())
 549         return CODEC_ERROR;
 550     DEBUGF("SPC: after init\n");
 551
 552     codec_set_replaygain(ci->id3);
 553
 554     /* Read the entire file */
 555     DEBUGF("SPC: request initial buffer\n");
 556     ci->seek_buffer(0);
 557     size_t buffersize;
 558     uint8_t* buffer = ci->request_buffer(&buffersize, ci->filesize);
 559     if (!buffer)
 560         return CODEC_ERROR;
 561
 562     DEBUGF("SPC: read size = 0x%lx\n",(unsigned long)buffersize);
 563     do
 564     {
 565         if (load_spc_buffer(buffer, buffersize)) {
 566             DEBUGF("SPC load failure\n");
 567             return CODEC_ERROR;
 568         }
 569
 570         LoadID666(buffer+0x2e);
 571
 572         if (ci->global_settings->repeat_mode!=REPEAT_ONE && ID666.length==0) {
 573             ID666.length=3*60*1000; /* 3 minutes */
 574             ID666.fade=5*1000; /* 5 seconds */
 575         }
 576
 577         reset_profile_timers();
 578     }
 579     while ( play_track() );
 580
 581     print_timers(ci->id3->path);
 582
 583     return CODEC_OK;
 584 }