summaryrefslogtreecommitdiffstats
path: root/apps/voice_thread.c
blob: 8d08e7744b291ad7318fe2fb147d68a2e46aa22a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2007 Michael Sevakis
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "system.h"
#include "thread.h"
#include "logf.h"
#include "voice_thread.h"
#include "talk.h"
#include "dsp.h"
#include "audio.h"
#include "playback.h"
#include "pcmbuf.h"
#include "codecs/libspeex/speex/speex.h"

/* Define any of these as "1" to log regular and/or timeout messages */
#define VOICE_LOGQUEUES 0
#define VOICE_LOGQUEUES_SYS_TIMEOUT 0

#if VOICE_LOGQUEUES
#define LOGFQUEUE logf
#else
#define LOGFQUEUE(...)
#endif

#if VOICE_LOGQUEUES_SYS_TIMEOUT
#define LOGFQUEUE_SYS_TIMEOUT logf
#else
#define LOGFQUEUE_SYS_TIMEOUT(...)
#endif

#ifndef IBSS_ATTR_VOICE_STACK
#define IBSS_ATTR_VOICE_STACK IBSS_ATTR
#endif

#define VOICE_FRAME_SIZE    320 /* Samples / frame */
#define VOICE_SAMPLE_RATE 16000 /* Sample rate in HZ */
#define VOICE_SAMPLE_DEPTH   16 /* Sample depth in bits */

/* Voice thread variables */
static struct thread_entry *voice_thread_p = NULL;
static long voice_stack[0x7c0/sizeof(long)] IBSS_ATTR_VOICE_STACK;
static const char voice_thread_name[] = "voice";

/* Voice thread synchronization objects */
static struct event_queue voice_queue SHAREDBSS_ATTR;
static struct mutex voice_mutex SHAREDBSS_ATTR;
static struct event voice_event SHAREDBSS_ATTR;
static struct queue_sender_list voice_queue_sender_list SHAREDBSS_ATTR;

/* Buffer for decoded samples */
static spx_int16_t voice_output_buf[VOICE_FRAME_SIZE] CACHEALIGN_ATTR;

enum voice_thread_states
{
    TSTATE_STOPPED = 0,   /* Voice thread is stopped and awaiting commands */
    TSTATE_DECODE,        /* Voice is decoding a clip */
    TSTATE_BUFFER_INSERT, /* Voice is sending decoded audio to PCM */
};

enum voice_thread_messages
{
    Q_VOICE_NULL = 0, /* A message for thread sync - no effect on state */
    Q_VOICE_PLAY,     /* Play a clip */
    Q_VOICE_STOP,     /* Stop current clip */
    Q_VOICE_STATE,    /* Query playing state */
};

/* Structure to store clip data callback info */
struct voice_info
{
    pcm_more_callback_type get_more; /* Callback to get more clips */
    unsigned char *start;            /* Start of clip */
    size_t size;                     /* Size of clip */
};

/* Private thread data for its current state that must be passed to its
 * internal functions */
struct voice_thread_data
{
    int state;              /* Thread state (TSTATE_*) */
    struct queue_event ev;  /* Last queue event pulled from queue */
    void *st;               /* Decoder instance */
    SpeexBits bits;         /* Bit cursor */
    struct dsp_config *dsp; /* DSP used for voice output */
    struct voice_info vi;   /* Copy of clip data */
    const char *src[2];     /* Current output buffer pointers */
    int lookahead;          /* Number of samples to drop at start of clip */
    int count;              /* Count of samples remaining to send to PCM */
};

/* Audio playback is in a playing state? */
static inline bool playback_is_playing(void)
{
    return (audio_status() & AUDIO_STATUS_PLAY) != 0;
}

/* Stop any current clip and start playing a new one */
void mp3_play_data(const unsigned char* start, int size,
                   pcm_more_callback_type get_more)
{
    /* Shared struct to get data to the thread - once it replies, it has
     * safely cached it in its own private data */
    static struct voice_info voice_clip SHAREDBSS_ATTR;

    if (get_more != NULL && start != NULL && (ssize_t)size > 0)
    {
        mutex_lock(&voice_mutex);

        voice_clip.get_more = get_more;
        voice_clip.start    = (unsigned char *)start;
        voice_clip.size     = size;
        LOGFQUEUE("mp3 >| voice Q_VOICE_PLAY");
        queue_send(&voice_queue, Q_VOICE_PLAY, (intptr_t)&voice_clip);

        mutex_unlock(&voice_mutex);
    }
}

/* Stop current voice clip from playing */
void mp3_play_stop(void)
{
    mutex_lock(&voice_mutex); /* Sync against voice_stop */

    LOGFQUEUE("mp3 > voice Q_VOICE_STOP: 1");
    queue_remove_from_head(&voice_queue, Q_VOICE_STOP);
    queue_post(&voice_queue, Q_VOICE_STOP, 1);

    mutex_unlock(&voice_mutex);
}

void mp3_play_pause(bool play)
{
    /* a dummy */
    (void)play;
}

/* Tell is voice is still in a playing state */
bool mp3_is_playing(void)
{
    /* TODO: Implement a timeout or state query function for event objects */
    LOGFQUEUE("mp3 >| voice Q_VOICE_STATE");
    int state = queue_send(&voice_queue, Q_VOICE_STATE, 0);
    return state != TSTATE_STOPPED;
}

/* This function is meant to be used by the buffer request functions to
   ensure the codec is no longer active */
void voice_stop(void)
{
    mutex_lock(&voice_mutex);

    /* Stop the output and current clip */
    LOGFQUEUE("mp3 >| voice Q_VOICE_STOP: 1");
    queue_send(&voice_queue, Q_VOICE_STOP, 1);

    /* Careful if using sync objects in talk.c - make sure locking order is
     * observed with one or the other always granted first */

    /* Unqueue all future clips */
    talk_force_shutup();

    /* Wait for any final queue_post to be processed */
    LOGFQUEUE("mp3 >| voice Q_VOICE_NULL");
    queue_send(&voice_queue, Q_VOICE_NULL, 0);

    mutex_unlock(&voice_mutex);
} /* voice_stop */

/* Wait for voice to finish speaking. */
void voice_wait(void)
{
    /* NOTE: One problem here is that we can't tell if another thread started a
     * new clip by the time we wait. This should be resolvable if conditions
     * ever require knowing the very clip you requested has finished. */
    event_wait(&voice_event, STATE_SIGNALED);
    /* Wait for PCM buffer to be exhausted. Works only if not playing. */
    while(!playback_is_playing() && pcm_is_playing())
        sleep(1);
}

/* Initialize voice thread data that must be valid upon starting and the
 * setup the DSP parameters */
static void voice_data_init(struct voice_thread_data *td)
{
    td->state = TSTATE_STOPPED;
    td->dsp = (struct dsp_config *)dsp_configure(NULL, DSP_MYDSP,
                                                 CODEC_IDX_VOICE);

    dsp_configure(td->dsp, DSP_RESET, 0);
    dsp_configure(td->dsp, DSP_SET_FREQUENCY, VOICE_SAMPLE_RATE);
    dsp_configure(td->dsp, DSP_SET_SAMPLE_DEPTH, VOICE_SAMPLE_DEPTH);
    dsp_configure(td->dsp, DSP_SET_STEREO_MODE, STEREO_MONO);
}

/* Voice thread message processing */
static void voice_message(struct voice_thread_data *td)
{
    while (1)
    {
        switch (td->ev.id)
        {
        case Q_VOICE_PLAY:
            LOGFQUEUE("voice < Q_VOICE_PLAY");
            /* Put up a block for completion signal */
            event_set_state(&voice_event, STATE_NONSIGNALED);

            /* Copy the clip info */
            td->vi = *(struct voice_info *)td->ev.data;

            /* Be sure audio buffer is initialized */
            audio_restore_playback(AUDIO_WANT_VOICE);

            /* We need nothing more from the sending thread - let it run */
            queue_reply(&voice_queue, 1);

            if (td->state == TSTATE_STOPPED)
            {
                /* Boost CPU now */
                trigger_cpu_boost();
            }
            else if (!playback_is_playing())
            {
                /* Just voice, stop any clip still playing */
                pcmbuf_play_stop();
            }

            /* Clean-start the decoder */
            td->st = speex_decoder_init(&speex_wb_mode);

            /* Make bit buffer use our own buffer */
            speex_bits_set_bit_buffer(&td->bits, td->vi.start, td->vi.size);
            speex_decoder_ctl(td->st, SPEEX_GET_LOOKAHEAD, &td->lookahead);

            td->state = TSTATE_DECODE;
            return;

        case Q_VOICE_STOP:
            LOGFQUEUE("voice < Q_VOICE_STOP: %d", ev.data);

            if (td->ev.data != 0 && !playback_is_playing())
            {
                /* If not playing, it's just voice so stop pcm playback */
                pcmbuf_play_stop();
            }

            /* Cancel boost */
            cancel_cpu_boost();

            td->state = TSTATE_STOPPED;
            event_set_state(&voice_event, STATE_SIGNALED);
            break;

        case Q_VOICE_STATE:
            LOGFQUEUE("voice < Q_VOICE_STATE");
            queue_reply(&voice_queue, td->state);

            if (td->state == TSTATE_STOPPED)
                break; /* Not in a playback state */

            return;

        default:
            /* Default messages get a reply and thread continues with no
             * state transition */
            LOGFQUEUE("voice < default");

            if (td->state == TSTATE_STOPPED)
                break;  /* Not in playback state */

            queue_reply(&voice_queue, 0);
            return;
        }

        queue_wait(&voice_queue, &td->ev);
    }
}

/* Voice thread entrypoint */
static void voice_thread(void)
{
    struct voice_thread_data td;

    voice_data_init(&td);
    audio_wait_for_init();
    
    goto message_wait;

    while (1)
    {
        td.state = TSTATE_DECODE;

        if (!queue_empty(&voice_queue))
        {
        message_wait:
            queue_wait(&voice_queue, &td.ev);

        message_process:
            voice_message(&td);

            /* Branch to initial start point or branch back to previous
             * operation if interrupted by a message */
            switch (td.state)
            {
            case TSTATE_DECODE:        goto voice_decode;
            case TSTATE_BUFFER_INSERT: goto buffer_insert;
            default:                   goto message_wait;
            }
        }

    voice_decode:
        /* Decode the data */
        if (speex_decode_int(td.st, &td.bits, voice_output_buf) < 0)
        {
            /* End of stream or error - get next clip */
            td.vi.size = 0;

            if (td.vi.get_more != NULL)
                td.vi.get_more(&td.vi.start, &td.vi.size);

            if (td.vi.start != NULL && (ssize_t)td.vi.size > 0)
            {
                /* Make bit buffer use our own buffer */
                speex_bits_set_bit_buffer(&td.bits, td.vi.start, td.vi.size);
                /* Don't skip any samples when we're stringing clips together */
                td.lookahead = 0;

                /* Paranoid check - be sure never to somehow get stuck in a
                 * loop without listening to the queue */
                yield();

                if (!queue_empty(&voice_queue))
                    goto message_wait;
                else
                    goto voice_decode;
            }

            /* If all clips are done and not playing, force pcm playback. */
            if (!pcm_is_playing())
                pcmbuf_play_start();

            /* Synthesize a stop request */
            /* NOTE: We have no way to know when the pcm data placed in the
             * buffer is actually consumed and playback has reached the end
             * so until the info is available or inferred somehow, this will
             * not be accurate and the stopped signal will come too soon.
             * ie. You may not hear the "Shutting Down" splash even though
             * it waits for voice to stop. */
            td.ev.id = Q_VOICE_STOP;
            td.ev.data = 0; /* Let PCM drain by itself */
            yield();
            goto message_process;
        }

        yield();

        /* Output the decoded frame */
        td.count = VOICE_FRAME_SIZE - td.lookahead;
        td.src[0] = (const char *)&voice_output_buf[td.lookahead];
        td.src[1] = NULL;
        td.lookahead -= MIN(VOICE_FRAME_SIZE, td.lookahead);

    buffer_insert:
        /* Process the PCM samples in the DSP and send out for mixing */
        td.state = TSTATE_BUFFER_INSERT;

        while (td.count > 0)
        {
            int out_count = dsp_output_count(td.dsp, td.count);
            int inp_count;
            char *dest;

            while (1)
            {
                if (!queue_empty(&voice_queue))
                    goto message_wait;

                if ((dest = pcmbuf_request_voice_buffer(&out_count)) != NULL)
                    break;

                yield();
            }

            /* Get the real input_size for output_size bytes, guarding
             * against resampling buffer overflows. */
            inp_count = dsp_input_count(td.dsp, out_count);

            if (inp_count <= 0)
                break;

            /* Input size has grown, no error, just don't write more than
             * length */
            if (inp_count > td.count)
                inp_count = td.count;

            out_count = dsp_process(td.dsp, dest, td.src, inp_count);

            if (out_count <= 0)
                break;

            pcmbuf_write_voice_complete(out_count);
            td.count -= inp_count;
        }

        yield();
    } /* end while */
} /* voice_thread */

/* Initialize all synchronization objects create the thread */
void voice_thread_init(void)
{
    logf("Starting voice thread");
    queue_init(&voice_queue, false);
    mutex_init(&voice_mutex);
    event_init(&voice_event, STATE_SIGNALED | EVENT_MANUAL);
    voice_thread_p = create_thread(voice_thread, voice_stack,
            sizeof(voice_stack), CREATE_THREAD_FROZEN,
            voice_thread_name IF_PRIO(, PRIORITY_PLAYBACK) IF_COP(, CPU));

    queue_enable_queue_send(&voice_queue, &voice_queue_sender_list,
                            voice_thread_p);
} /* voice_thread_init */

/* Unfreeze the voice thread */
void voice_thread_resume(void)
{
    logf("Thawing voice thread");
    thread_thaw(voice_thread_p);
}

#ifdef HAVE_PRIORITY_SCHEDULING
/* Set the voice thread priority */
void voice_thread_set_priority(int priority)
{
    thread_set_priority(voice_thread_p, priority);
}
#endif