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