summaryrefslogtreecommitdiffstats
path: root/firmware/pcm.c
blob: 6bf0e12c8dfc467c22499438f1ddf8419958013f (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
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2007 by 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 <stdlib.h>
#include "system.h"
#include "kernel.h"

/* Define LOGF_ENABLE to enable logf output in this file */
/*#define LOGF_ENABLE*/
#include "logf.h"
#include "audio.h"
#include "sound.h"
#include "general.h"
#include "pcm-internal.h"
#include "pcm_mixer.h"

/**
 * Aspects implemented in the target-specific portion:
 *
 * ==Playback==
 *   Public -
 *      pcm_postinit
 *      pcm_get_bytes_waiting
 *      pcm_play_lock
 *      pcm_play_unlock
 *   Semi-private -
 *      pcm_play_dma_complete_callback
 *      pcm_play_dma_status_callback
 *      pcm_play_dma_init
 *      pcm_play_dma_postinit
 *      pcm_play_dma_start
 *      pcm_play_dma_stop
 *      pcm_play_dma_pause
 *      pcm_play_dma_get_peak_buffer
 *   Data Read/Written within TSP -
 *      pcm_sampr (R)
 *      pcm_fsel (R)
 *      pcm_curr_sampr (R)
 *      pcm_playing (R)
 *      pcm_paused (R)
 *
 * ==Playback/Recording==
 *   Public -
 *      pcm_dma_addr
 *   Semi-private -
 *      pcm_dma_apply_settings
 *
 * ==Recording==
 *   Public -
 *      pcm_rec_lock
 *      pcm_rec_unlock
 *   Semi-private -
 *      pcm_rec_dma_complete_callback
 *      pcm_rec_dma_status_callback
 *      pcm_rec_dma_init
 *      pcm_rec_dma_close
 *      pcm_rec_dma_start
 *      pcm_rec_dma_stop
 *      pcm_rec_dma_get_peak_buffer
 *   Data Read/Written within TSP -
 *      pcm_recording (R)
 *
 * States are set _after_ the target's pcm driver is called so that it may
 * know from whence the state is changed. One exception is init.
 *
 */

/* 'true' when all stages of pcm initialization have completed */
static bool pcm_is_ready = false;

/* The registered callback function to ask for more mp3 data */
volatile pcm_play_callback_type
    pcm_callback_for_more SHAREDBSS_ATTR = NULL;
/* The registered callback function to inform of DMA status */
volatile pcm_status_callback_type
    pcm_play_status_callback SHAREDBSS_ATTR = NULL;
/* PCM playback state */
volatile bool pcm_playing SHAREDBSS_ATTR = false;
/* PCM paused state. paused implies playing */
volatile bool pcm_paused SHAREDBSS_ATTR = false;
/* samplerate of currently playing audio - undefined if stopped */
unsigned long pcm_curr_sampr SHAREDBSS_ATTR = 0;
/* samplerate waiting to be set */
unsigned long pcm_sampr SHAREDBSS_ATTR = HW_SAMPR_DEFAULT;
/* samplerate frequency selection index */
int pcm_fsel SHAREDBSS_ATTR = HW_FREQ_DEFAULT;

static void pcm_play_data_start_int(const void *addr, size_t size);
static void pcm_play_pause_int(bool play);
void pcm_play_stop_int(void);

#ifndef HAVE_SW_VOLUME_CONTROL
/** Standard hw volume control functions - otherwise, see pcm_sw_volume.c **/
static inline void pcm_play_dma_start_int(const void *addr, size_t size)
{
    pcm_play_dma_start(addr, size);
}

static inline void pcm_play_dma_pause_int(bool pause)
{
    if (pause || pcm_get_bytes_waiting() > 0)
    {
        pcm_play_dma_pause(pause);
    }
    else
    {
        logf(" no data");
        pcm_play_data_start_int(NULL, 0);
    }
}

static inline void pcm_play_dma_stop_int(void)
{
    pcm_play_dma_stop();
}

static inline const void * pcm_play_dma_get_peak_buffer_int(int *count)
{
    return pcm_play_dma_get_peak_buffer(count);
}

bool pcm_play_dma_complete_callback(enum pcm_dma_status status,
                                    const void **addr, size_t *size)
{
    /* Check status callback first if error */
    if (status < PCM_DMAST_OK)
        status = pcm_play_dma_status_callback(status);

    if (status >= PCM_DMAST_OK && pcm_get_more_int(addr, size))
        return true;

    /* Error, callback missing or no more DMA to do */
    pcm_play_stop_int();
    return false;
}
#endif /* ndef HAVE_SW_VOLUME_CONTROL */

static void pcm_play_data_start_int(const void *addr, size_t size)
{
    ALIGN_AUDIOBUF(addr, size);

    if ((addr && size) || pcm_get_more_int(&addr, &size))
    {
        pcm_apply_settings();
        logf(" pcm_play_dma_start_int");
        pcm_play_dma_start_int(addr, size);
        pcm_playing = true;
        pcm_paused = false;
    }
    else
    {
        /* Force a stop */
        logf(" pcm_play_stop_int");
        pcm_play_stop_int();
    }
}

static void pcm_play_pause_int(bool play)
{
    if (play)
        pcm_apply_settings();

    logf(" pcm_play_dma_pause_int");
    pcm_play_dma_pause_int(!play);
    pcm_paused = !play && pcm_playing;
}

void pcm_play_stop_int(void)
{
    pcm_play_dma_stop_int();
    pcm_callback_for_more = NULL;
    pcm_play_status_callback = NULL;
    pcm_paused = false;
    pcm_playing = false;
}

static void pcm_wait_for_init(void)
{
    while (!pcm_is_ready)
        sleep(0);
}

/**
 * Perform peak calculation on a buffer of packed 16-bit samples.
 *
 * Used for recording and playback.
 */
static void pcm_peak_peeker(const int16_t *p, int count,
                            struct pcm_peaks *peaks)
{
    uint32_t peak_l = 0, peak_r = 0;
    const int16_t *pend = p + 2 * count;

    do
    {
        int32_t s;

        s = p[0];

        if (s < 0)
            s = -s;

        if ((uint32_t)s > peak_l)
            peak_l = s;

        s = p[1];

        if (s < 0)
            s = -s;

        if ((uint32_t)s > peak_r)
            peak_r = s;

        p += 4 * 2; /* Every 4th sample, interleaved */
    }
    while (p < pend);

    peaks->left = peak_l;
    peaks->right = peak_r;
}

void pcm_do_peak_calculation(struct pcm_peaks *peaks, bool active,
                             const void *addr, int count)
{
    long tick = current_tick;

    /* Peak no farther ahead than expected period to avoid overcalculation */
    long period = tick - peaks->tick;

    /* Keep reasonable limits on period */
    if (period < 1)
        period = 1;
    else if (period > HZ/5)
        period = HZ/5;

    peaks->period = (3*peaks->period + period) / 4;
    peaks->tick = tick;

    if (active)
    {
        int framecount = peaks->period*pcm_curr_sampr / HZ;
        count = MIN(framecount, count);

        if (count > 0)
            pcm_peak_peeker(addr, count, peaks);
        /* else keep previous peak values */
    }
    else
    {
        /* peaks are zero */
        peaks->left = peaks->right = 0;
    }
}

void pcm_calculate_peaks(int *left, int *right)
{
    /* peak data for the global peak values - i.e. what the final output is */
    static struct pcm_peaks peaks;

    int count;
    const void *addr = pcm_play_dma_get_peak_buffer_int(&count);

    pcm_do_peak_calculation(&peaks, pcm_playing && !pcm_paused,
                            addr, count);

    if (left)
        *left = peaks.left;

    if (right)
        *right = peaks.right;
}

const void * pcm_get_peak_buffer(int *count)
{
    return pcm_play_dma_get_peak_buffer_int(count);
}

bool pcm_is_playing(void)
{
    return pcm_playing;
}

bool pcm_is_paused(void)
{
    return pcm_paused;
}

/****************************************************************************
 * Functions that do not require targeted implementation but only a targeted
 * interface
 */

/* This should only be called at startup before any audio playback or
   recording is attempted */
void pcm_init(void)
{
    logf("pcm_init");

    pcm_set_frequency(HW_SAMPR_DEFAULT);

    logf(" pcm_play_dma_init");
    pcm_play_dma_init();
}

/* Finish delayed init */
void pcm_postinit(void)
{
    logf("pcm_postinit");

    logf(" pcm_play_dma_postinit");

    pcm_play_dma_postinit();

    pcm_is_ready = true;
}

bool pcm_is_initialized(void)
{
    return pcm_is_ready;
}

void pcm_play_data(pcm_play_callback_type get_more,
                   pcm_status_callback_type status_cb,
                   const void *start, size_t size)
{
    logf("pcm_play_data");

    pcm_play_lock();

    pcm_callback_for_more = get_more;
    pcm_play_status_callback = status_cb;

    logf(" pcm_play_data_start_int");
    pcm_play_data_start_int(start, size);

    pcm_play_unlock();
}

void pcm_play_pause(bool play)
{
    logf("pcm_play_pause: %s", play ? "play" : "pause");

    pcm_play_lock();

    if (play == pcm_paused && pcm_playing)
    {
        logf(" pcm_play_pause_int");
        pcm_play_pause_int(play);
    }

    pcm_play_unlock();
}

void pcm_play_stop(void)
{
    logf("pcm_play_stop");

    pcm_play_lock();

    if (pcm_playing)
    {
        logf(" pcm_play_stop_int");
        pcm_play_stop_int();
    }

    pcm_play_unlock();
}

/**/

/* set frequency next frequency used by the audio hardware -
 * what pcm_apply_settings will set */
void pcm_set_frequency(unsigned int samplerate)
{
    logf("pcm_set_frequency");

    int index;

#ifdef CONFIG_SAMPR_TYPES
    unsigned int type = samplerate & SAMPR_TYPE_MASK;
    samplerate &= ~SAMPR_TYPE_MASK;

    /* For now, supported targets have direct conversion when configured with
     * CONFIG_SAMPR_TYPES.
     * Some hypothetical target with independent rates would need slightly
     * different handling throughout this source. */
    samplerate = pcm_sampr_to_hw_sampr(samplerate, type);
#endif /* CONFIG_SAMPR_TYPES */

    index = round_value_to_list32(samplerate, hw_freq_sampr,
                                  HW_NUM_FREQ, false);

    if (samplerate != hw_freq_sampr[index])
        index = HW_FREQ_DEFAULT; /* Invalid = default */

    pcm_sampr = hw_freq_sampr[index];
    pcm_fsel = index;
}

/* apply pcm settings to the hardware */
void pcm_apply_settings(void)
{
    logf("pcm_apply_settings");

    pcm_wait_for_init();

    if (pcm_sampr != pcm_curr_sampr)
    {
        logf(" pcm_dma_apply_settings");
        pcm_dma_apply_settings();
        pcm_curr_sampr = pcm_sampr;
    }
}

#ifdef HAVE_RECORDING
/** Low level pcm recording apis **/

/* Next start for recording peaks */
static const void * volatile pcm_rec_peak_addr SHAREDBSS_ATTR = NULL;
/* the registered callback function for when more data is available */
static volatile pcm_rec_callback_type
    pcm_callback_more_ready SHAREDBSS_ATTR = NULL;
volatile pcm_status_callback_type
    pcm_rec_status_callback SHAREDBSS_ATTR = NULL;
/* DMA transfer in is currently active */
volatile bool pcm_recording SHAREDBSS_ATTR = false;

/* Called internally by functions to reset the state */
static void pcm_recording_stopped(void)
{
    pcm_recording = false;
    pcm_callback_more_ready = NULL;
    pcm_rec_status_callback = NULL;
}

/**
 * Return recording peaks - From the end of the last peak up to
 *                          current write position.
 */
void pcm_calculate_rec_peaks(int *left, int *right)
{
    static struct pcm_peaks peaks;

    if (pcm_recording)
    {
        const int16_t *peak_addr = pcm_rec_peak_addr;
        const int16_t *addr = pcm_rec_dma_get_peak_buffer();

        if (addr != NULL)
        {
            int count = (addr - peak_addr) / 2; /* Interleaved L+R */

            if (count > 0)
            {
                pcm_peak_peeker(peak_addr, count, &peaks);

                if (peak_addr == pcm_rec_peak_addr)
                    pcm_rec_peak_addr = addr;
            }
        }
        /* else keep previous peak values */
    }
    else
    {
        peaks.left = peaks.right = 0;
    }

    if (left)
        *left = peaks.left;

    if (right)
        *right = peaks.right;
}

bool pcm_is_recording(void)
{
    return pcm_recording;
}

/****************************************************************************
 * Functions that do not require targeted implementation but only a targeted
 * interface
 */

void pcm_init_recording(void)
{
    logf("pcm_init_recording");

    pcm_wait_for_init();

    /* Stop the beasty before attempting recording */
    mixer_reset();

    /* Recording init is locked unlike general pcm init since this is not
     * just a one-time event at startup and it should and must be safe by
     * now. */
    pcm_rec_lock();

    logf(" pcm_rec_dma_init");
    pcm_recording_stopped();
    pcm_rec_dma_init();

    pcm_rec_unlock();
}

void pcm_close_recording(void)
{
    logf("pcm_close_recording");

    pcm_rec_lock();

    if (pcm_recording)
    {
        logf(" pcm_rec_dma_stop");
        pcm_rec_dma_stop();
        pcm_recording_stopped();
    }

    logf(" pcm_rec_dma_close");
    pcm_rec_dma_close();

    pcm_rec_unlock();
}

void pcm_record_data(pcm_rec_callback_type more_ready,
                     pcm_status_callback_type status_cb,
                     void *addr, size_t size)
{
    logf("pcm_record_data");

    ALIGN_AUDIOBUF(addr, size);

    if (!(addr && size))
    {
        logf(" no buffer");
        return;
    }

    pcm_rec_lock();

    pcm_callback_more_ready = more_ready;
    pcm_rec_status_callback = status_cb;

    /* Need a physical DMA address translation, if not already physical. */
    pcm_rec_peak_addr = pcm_rec_dma_addr(addr);

    logf(" pcm_rec_dma_start");
    pcm_apply_settings();
    pcm_rec_dma_start(addr, size);
    pcm_recording = true;

    pcm_rec_unlock();
} /* pcm_record_data */

void pcm_stop_recording(void)
{
    logf("pcm_stop_recording");

    pcm_rec_lock();

    if (pcm_recording)
    {
        logf(" pcm_rec_dma_stop");
        pcm_rec_dma_stop();
        pcm_recording_stopped();
    }

    pcm_rec_unlock();
} /* pcm_stop_recording */

bool pcm_rec_dma_complete_callback(enum pcm_dma_status status,
                                   void **addr, size_t *size)
{
     /* Check status callback first if error */
    if (status < PCM_DMAST_OK)
        status = pcm_rec_dma_status_callback(status);

    pcm_rec_callback_type have_more = pcm_callback_more_ready;

    if (have_more && status >= PCM_DMAST_OK)
    {
        /* Call registered callback to obtain next buffer */
        have_more(addr, size);
        ALIGN_AUDIOBUF(*addr, *size);

        if (*addr && *size)
        {
            /* Need a physical DMA address translation, if not already
             * physical. */
            pcm_rec_peak_addr = pcm_rec_dma_addr(*addr);
            return true;
        }
    }

    /* Error, callback missing or no more DMA to do */
    pcm_rec_dma_stop();
    pcm_recording_stopped();

    return false;
}

#endif /* HAVE_RECORDING */