apps/voice_thread.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 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 <sys/types.h>
  22 #include "system.h"
  23 #include "thread.h"
  24 #include "voice_thread.h"
  25 #include "talk.h"
  26 #include "dsp.h"
  27 #include "audio.h"
  28 #include "playback.h"
  29 #include "pcmbuf.h"
  30 #include "codecs/libspeex/speex/speex.h"
  31
  32 /* Define any of these as "1" and uncomment the LOGF_ENABLE line to log
  33    regular and/or timeout messages */
  34 #define VOICE_LOGQUEUES 0
  35 #define VOICE_LOGQUEUES_SYS_TIMEOUT 0
  36
  37 /*#define LOGF_ENABLE*/
  38 #include "logf.h"
  39
  40 #if VOICE_LOGQUEUES
  41 #define LOGFQUEUE logf
  42 #else
  43 #define LOGFQUEUE(...)
  44 #endif
  45
  46 #if VOICE_LOGQUEUES_SYS_TIMEOUT
  47 #define LOGFQUEUE_SYS_TIMEOUT logf
  48 #else
  49 #define LOGFQUEUE_SYS_TIMEOUT(...)
  50 #endif
  51
  52 #ifndef IBSS_ATTR_VOICE_STACK
  53 #define IBSS_ATTR_VOICE_STACK IBSS_ATTR
  54 #endif
  55
  56 #define VOICE_FRAME_SIZE    320 /* Samples / frame */
  57 #define VOICE_SAMPLE_RATE 16000 /* Sample rate in HZ */
  58 #define VOICE_SAMPLE_DEPTH   16 /* Sample depth in bits */
  59
  60 /* Voice thread variables */
  61 static unsigned int voice_thread_id = 0;
  62 static long voice_stack[0x7c0/sizeof(long)] IBSS_ATTR_VOICE_STACK;
  63 static const char voice_thread_name[] = "voice";
  64
  65 /* Voice thread synchronization objects */
  66 static struct event_queue voice_queue SHAREDBSS_ATTR;
  67 static struct mutex voice_mutex SHAREDBSS_ATTR;
  68 static struct queue_sender_list voice_queue_sender_list SHAREDBSS_ATTR;
  69 static bool voice_done SHAREDDATA_ATTR = true;
  70
  71 /* Buffer for decoded samples */
  72 static spx_int16_t voice_output_buf[VOICE_FRAME_SIZE] CACHEALIGN_ATTR;
  73
  74 enum voice_thread_states
  75 {
  76     TSTATE_STOPPED = 0,   /* Voice thread is stopped and awaiting commands */
  77     TSTATE_DECODE,        /* Voice is decoding a clip */
  78     TSTATE_BUFFER_INSERT, /* Voice is sending decoded audio to PCM */
  79 };
  80
  81 enum voice_thread_messages
  82 {
  83     Q_VOICE_NULL = 0, /* A message for thread sync - no effect on state */
  84     Q_VOICE_PLAY,     /* Play a clip */
  85     Q_VOICE_STOP,     /* Stop current clip */
  86     Q_VOICE_STATE,    /* Query playing state */
  87 };
  88
  89 /* Structure to store clip data callback info */
  90 struct voice_info
  91 {
  92     pcm_more_callback_type get_more; /* Callback to get more clips */
  93     unsigned char *start;            /* Start of clip */
  94     size_t size;                     /* Size of clip */
  95 };
  96
  97 /* Private thread data for its current state that must be passed to its
  98  * internal functions */
  99 struct voice_thread_data
 100 {
 101     int state;              /* Thread state (TSTATE_*) */
 102     struct queue_event ev;  /* Last queue event pulled from queue */
 103     void *st;               /* Decoder instance */
 104     SpeexBits bits;         /* Bit cursor */
 105     struct dsp_config *dsp; /* DSP used for voice output */
 106     struct voice_info vi;   /* Copy of clip data */
 107     const char *src[2];     /* Current output buffer pointers */
 108     int lookahead;          /* Number of samples to drop at start of clip */
 109     int count;              /* Count of samples remaining to send to PCM */
 110 };
 111
 112 /* Audio playback is in a playing state? */
 113 static inline bool playback_is_playing(void)
 114 {
 115     return (audio_status() & AUDIO_STATUS_PLAY) != 0;
 116 }
 117
 118 /* Stop any current clip and start playing a new one */
 119 void mp3_play_data(const unsigned char* start, int size,
 120                    pcm_more_callback_type get_more)
 121 {
 122     /* Shared struct to get data to the thread - once it replies, it has
 123      * safely cached it in its own private data */
 124     static struct voice_info voice_clip SHAREDBSS_ATTR;
 125
 126     if (get_more != NULL && start != NULL && (ssize_t)size > 0)
 127     {
 128         mutex_lock(&voice_mutex);
 129
 130         voice_clip.get_more = get_more;
 131         voice_clip.start    = (unsigned char *)start;
 132         voice_clip.size     = size;
 133         LOGFQUEUE("mp3 >| voice Q_VOICE_PLAY");
 134         queue_send(&voice_queue, Q_VOICE_PLAY, (intptr_t)&voice_clip);
 135
 136         mutex_unlock(&voice_mutex);
 137     }
 138 }
 139
 140 /* Stop current voice clip from playing */
 141 void mp3_play_stop(void)
 142 {
 143     if(!audio_is_thread_ready())
 144        return;
 145
 146     mutex_lock(&voice_mutex); /* Sync against voice_stop */
 147     LOGFQUEUE("mp3 >| voice Q_VOICE_STOP: 1");
 148     queue_send(&voice_queue, Q_VOICE_STOP, 1);
 149
 150     mutex_unlock(&voice_mutex);
 151 }
 152
 153 void mp3_play_pause(bool play)
 154 {
 155     /* a dummy */
 156     (void)play;
 157 }
 158
 159 /* Tell is voice is still in a playing state */
 160 bool mp3_is_playing(void)
 161 {
 162     /* TODO: Implement a timeout or state query function for event objects */
 163     LOGFQUEUE("mp3 >| voice Q_VOICE_STATE");
 164     int state = queue_send(&voice_queue, Q_VOICE_STATE, 0);
 165     return state != TSTATE_STOPPED;
 166 }
 167
 168 /* This function is meant to be used by the buffer request functions to
 169    ensure the codec is no longer active */
 170 void voice_stop(void)
 171 {
 172     mutex_lock(&voice_mutex);
 173
 174     /* Stop the output and current clip */
 175     mp3_play_stop();
 176
 177     /* Careful if using sync objects in talk.c - make sure locking order is
 178      * observed with one or the other always granted first */
 179
 180     /* Unqueue all future clips */
 181     talk_force_shutup();
 182
 183     /* Wait for any final queue_post to be processed */
 184     LOGFQUEUE("mp3 >| voice Q_VOICE_NULL");
 185     queue_send(&voice_queue, Q_VOICE_NULL, 0);
 186
 187     mutex_unlock(&voice_mutex);
 188 } /* voice_stop */
 189
 190 /* Wait for voice to finish speaking. */
 191 void voice_wait(void)
 192 {
 193     /* NOTE: One problem here is that we can't tell if another thread started a
 194      * new clip by the time we wait. This should be resolvable if conditions
 195      * ever require knowing the very clip you requested has finished. */
 196
 197     /* Wait for PCM buffer to be exhausted. Works only if not playing. */
 198     while(!voice_done || (!playback_is_playing() && pcm_is_playing()))
 199         sleep(1);
 200 }
 201
 202 /* Initialize voice thread data that must be valid upon starting and the
 203  * setup the DSP parameters */
 204 static void voice_data_init(struct voice_thread_data *td)
 205 {
 206     td->state = TSTATE_STOPPED;
 207     td->dsp = (struct dsp_config *)dsp_configure(NULL, DSP_MYDSP,
 208                                                  CODEC_IDX_VOICE);
 209
 210     dsp_configure(td->dsp, DSP_RESET, 0);
 211     dsp_configure(td->dsp, DSP_SET_FREQUENCY, VOICE_SAMPLE_RATE);
 212     dsp_configure(td->dsp, DSP_SET_SAMPLE_DEPTH, VOICE_SAMPLE_DEPTH);
 213     dsp_configure(td->dsp, DSP_SET_STEREO_MODE, STEREO_MONO);
 214 }
 215
 216 /* Voice thread message processing */
 217 static void voice_message(struct voice_thread_data *td)
 218 {
 219     while (1)
 220     {
 221         switch (td->ev.id)
 222         {
 223         case Q_VOICE_PLAY:
 224             LOGFQUEUE("voice < Q_VOICE_PLAY");
 225             /* Put up a block for completion signal */
 226             voice_done = false;
 227
 228             /* Copy the clip info */
 229             td->vi = *(struct voice_info *)td->ev.data;
 230
 231             /* Be sure audio buffer is initialized */
 232             audio_restore_playback(AUDIO_WANT_VOICE);
 233
 234             /* We need nothing more from the sending thread - let it run */
 235             queue_reply(&voice_queue, 1);
 236
 237             if (td->state == TSTATE_STOPPED)
 238             {
 239                 /* Boost CPU now */
 240                 trigger_cpu_boost();
 241             }
 242             else if (!playback_is_playing())
 243             {
 244                 /* Just voice, stop any clip still playing */
 245                 pcmbuf_play_stop();
 246             }
 247
 248             /* Clean-start the decoder */
 249             td->st = speex_decoder_init(&speex_wb_mode);
 250
 251             /* Make bit buffer use our own buffer */
 252             speex_bits_set_bit_buffer(&td->bits, td->vi.start, td->vi.size);
 253             speex_decoder_ctl(td->st, SPEEX_GET_LOOKAHEAD, &td->lookahead);
 254
 255             td->state = TSTATE_DECODE;
 256             return;
 257
 258         case Q_VOICE_STOP:
 259             LOGFQUEUE("voice < Q_VOICE_STOP: %ld", td->ev.data);
 260
 261             if (td->ev.data != 0 && !playback_is_playing())
 262             {
 263                 /* If not playing, it's just voice so stop pcm playback */
 264                 pcmbuf_play_stop();
 265             }
 266
 267             /* Cancel boost */
 268             cancel_cpu_boost();
 269
 270             td->state = TSTATE_STOPPED;
 271             voice_done = true;
 272             break;
 273
 274         case Q_VOICE_STATE:
 275             LOGFQUEUE("voice < Q_VOICE_STATE");
 276             queue_reply(&voice_queue, td->state);
 277
 278             if (td->state == TSTATE_STOPPED)
 279                 break; /* Not in a playback state */
 280
 281             return;
 282
 283         default:
 284             /* Default messages get a reply and thread continues with no
 285              * state transition */
 286             LOGFQUEUE("voice < default");
 287
 288             if (td->state == TSTATE_STOPPED)
 289                 break;  /* Not in playback state */
 290
 291             queue_reply(&voice_queue, 0);
 292             return;
 293         }
 294
 295         queue_wait(&voice_queue, &td->ev);
 296     }
 297 }
 298
 299 /* Voice thread entrypoint */
 300 static void voice_thread(void)
 301 {
 302     struct voice_thread_data td;
 303
 304     voice_data_init(&td);
 305
 306     /* audio thread will only set this once after it finished the final
 307      * audio hardware init so this little construct is safe - even
 308      * cross-core. */
 309     while (!audio_is_thread_ready())
 310         sleep(0);
 311
 312     goto message_wait;
 313
 314     while (1)
 315     {
 316         td.state = TSTATE_DECODE;
 317
 318         if (!queue_empty(&voice_queue))
 319         {
 320         message_wait:
 321             queue_wait(&voice_queue, &td.ev);
 322
 323         message_process:
 324             voice_message(&td);
 325
 326             /* Branch to initial start point or branch back to previous
 327              * operation if interrupted by a message */
 328             switch (td.state)
 329             {
 330             case TSTATE_DECODE:        goto voice_decode;
 331             case TSTATE_BUFFER_INSERT: goto buffer_insert;
 332             default:                   goto message_wait;
 333             }
 334         }
 335
 336     voice_decode:
 337         /* Decode the data */
 338         if (speex_decode_int(td.st, &td.bits, voice_output_buf) < 0)
 339         {
 340             /* End of stream or error - get next clip */
 341             td.vi.size = 0;
 342
 343             if (td.vi.get_more != NULL)
 344                 td.vi.get_more(&td.vi.start, &td.vi.size);
 345
 346             if (td.vi.start != NULL && (ssize_t)td.vi.size > 0)
 347             {
 348                 /* Make bit buffer use our own buffer */
 349                 speex_bits_set_bit_buffer(&td.bits, td.vi.start, td.vi.size);
 350                 /* Don't skip any samples when we're stringing clips together */
 351                 td.lookahead = 0;
 352
 353                 /* Paranoid check - be sure never to somehow get stuck in a
 354                  * loop without listening to the queue */
 355                 yield();
 356
 357                 if (!queue_empty(&voice_queue))
 358                     goto message_wait;
 359                 else
 360                     goto voice_decode;
 361             }
 362
 363             /* If all clips are done and not playing, force pcm playback. */
 364             if (!pcm_is_playing())
 365                 pcmbuf_play_start();
 366
 367             /* Synthesize a stop request */
 368             /* NOTE: We have no way to know when the pcm data placed in the
 369              * buffer is actually consumed and playback has reached the end
 370              * so until the info is available or inferred somehow, this will
 371              * not be accurate and the stopped signal will come too soon.
 372              * ie. You may not hear the "Shutting Down" splash even though
 373              * it waits for voice to stop. */
 374             td.ev.id = Q_VOICE_STOP;
 375             td.ev.data = 0; /* Let PCM drain by itself */
 376             yield();
 377             goto message_process;
 378         }
 379
 380         yield();
 381
 382         /* Output the decoded frame */
 383         td.count = VOICE_FRAME_SIZE - td.lookahead;
 384         td.src[0] = (const char *)&voice_output_buf[td.lookahead];
 385         td.src[1] = NULL;
 386         td.lookahead -= MIN(VOICE_FRAME_SIZE, td.lookahead);
 387
 388     buffer_insert:
 389         /* Process the PCM samples in the DSP and send out for mixing */
 390         td.state = TSTATE_BUFFER_INSERT;
 391
 392         while (td.count > 0)
 393         {
 394             int out_count = dsp_output_count(td.dsp, td.count);
 395             int inp_count;
 396             char *dest;
 397
 398             while (1)
 399             {
 400                 if (!queue_empty(&voice_queue))
 401                     goto message_wait;
 402
 403                 if ((dest = pcmbuf_request_voice_buffer(&out_count)) != NULL)
 404                     break;
 405
 406                 yield();
 407             }
 408
 409             /* Get the real input_size for output_size bytes, guarding
 410              * against resampling buffer overflows. */
 411             inp_count = dsp_input_count(td.dsp, out_count);
 412
 413             if (inp_count <= 0)
 414                 break;
 415
 416             /* Input size has grown, no error, just don't write more than
 417              * length */
 418             if (inp_count > td.count)
 419                 inp_count = td.count;
 420
 421             out_count = dsp_process(td.dsp, dest, td.src, inp_count);
 422
 423             if (out_count <= 0)
 424                 break;
 425
 426             pcmbuf_write_voice_complete(out_count);
 427             td.count -= inp_count;
 428         }
 429
 430         yield();
 431     } /* end while */
 432 } /* voice_thread */
 433
 434 /* Initialize all synchronization objects create the thread */
 435 void voice_thread_init(void)
 436 {
 437     logf("Starting voice thread");
 438     queue_init(&voice_queue, false);
 439     mutex_init(&voice_mutex);
 440
 441     voice_thread_id = create_thread(voice_thread, voice_stack,
 442             sizeof(voice_stack), CREATE_THREAD_FROZEN,
 443             voice_thread_name IF_PRIO(, PRIORITY_PLAYBACK) IF_COP(, CPU));
 444
 445     queue_enable_queue_send(&voice_queue, &voice_queue_sender_list,
 446                             voice_thread_id);
 447 } /* voice_thread_init */
 448
 449 /* Unfreeze the voice thread */
 450 void voice_thread_resume(void)
 451 {
 452     logf("Thawing voice thread");
 453     thread_thaw(voice_thread_id);
 454 }
 455
 456 #ifdef HAVE_PRIORITY_SCHEDULING
 457 /* Set the voice thread priority */
 458 void voice_thread_set_priority(int priority)
 459 {
 460     thread_set_priority(voice_thread_id, priority);
 461 }
 462 #endif