aboutsummaryrefslogtreecommitdiffstats
path: root/src/player_thread.c
blob: 6f0828f931df3672f2f0d67f1fe03f6d2e381ca3 (plain) (blame)
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
/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: http://www.musicpd.org
 *
 * 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 program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "player_thread.h"
#include "playerData.h"
#include "audio.h"
#include "pcm_utils.h"
#include "path.h"
#include "log.h"
#include "main_notify.h"
#include "crossfade.h"

enum xfade_state {
	XFADE_DISABLED = -1,
	XFADE_UNKNOWN = 0,
	XFADE_ENABLED = 1
};

static void quitDecode(void)
{
	dc_stop(&pc.notify);
	pc.state = PLAYER_STATE_STOP;
	pc.command = PLAYER_COMMAND_NONE;
	wakeup_main_task();
}

static int waitOnDecode(int *decodeWaitedOn)
{
	dc_command_wait(&pc.notify);

	if (dc.error != DECODE_ERROR_NOERROR) {
		assert(dc.next_song == NULL || dc.next_song->url != NULL);
		pc.errored_song = dc.next_song;
		pc.error = PLAYER_ERROR_FILE;
		return -1;
	}

	pc.totalTime = pc.fileTime;
	pc.bitRate = 0;
	pc.sampleRate = 0;
	pc.bits = 0;
	pc.channels = 0;
	*decodeWaitedOn = 1;

	return 0;
}

static int decodeSeek(int *decodeWaitedOn, int *next)
{
	int ret = -1;
	double where;

	if (dc.state == DECODE_STATE_STOP ||
	    dc.error != DECODE_ERROR_NOERROR ||
	    dc.current_song != pc.next_song) {
		dc_stop(&pc.notify);
		*next = -1;
		ob_clear();
		dc_start_async(pc.next_song);
		waitOnDecode(decodeWaitedOn);
	}

	where = pc.seekWhere;
	if (where > pc.totalTime)
		where = pc.totalTime - 0.1;
	if (where < 0.0)
		where = 0.0;

	ret = dc_seek(&pc.notify, where);
	if (ret == 0)
		pc.elapsedTime = where;

	player_command_finished();

	return ret;
}

static void processDecodeInput(int *pause_r, unsigned int *bbp_r,
			       enum xfade_state *do_xfade_r,
			       int *decodeWaitedOn_r,
			       int *next_r)
{
	switch (pc.command) {
	case PLAYER_COMMAND_NONE:
	case PLAYER_COMMAND_PLAY:
	case PLAYER_COMMAND_STOP:
	case PLAYER_COMMAND_EXIT:
	case PLAYER_COMMAND_CLOSE_AUDIO:
		break;

	case PLAYER_COMMAND_LOCK_QUEUE:
		pc.queueLockState = PLAYER_QUEUE_LOCKED;
		player_command_finished();
		break;

	case PLAYER_COMMAND_UNLOCK_QUEUE:
		pc.queueLockState = PLAYER_QUEUE_UNLOCKED;
		player_command_finished();
		break;

	case PLAYER_COMMAND_PAUSE:
		*pause_r = !*pause_r;
		if (*pause_r) {
			pc.state = PLAYER_STATE_PAUSE;
		} else {
			if (openAudioDevice(NULL) >= 0) {
				pc.state = PLAYER_STATE_PLAY;
			} else {
				char tmp[MPD_PATH_MAX];
				assert(dc.next_song == NULL || dc.next_song->url != NULL);
				pc.errored_song = dc.next_song;
				pc.error = PLAYER_ERROR_AUDIO;
				ERROR("problems opening audio device "
				      "while playing \"%s\"\n",
				      get_song_url(tmp, dc.next_song));
				*pause_r = -1;
			}
		}
		player_command_finished();
		if (*pause_r == -1) {
			*pause_r = 1;
		} else if (*pause_r) {
			dropBufferedAudio();
			closeAudioDevice();
		}
		break;

	case PLAYER_COMMAND_SEEK:
		dropBufferedAudio();
		if (decodeSeek(decodeWaitedOn_r, next_r) == 0) {
			*do_xfade_r = XFADE_UNKNOWN;
			*bbp_r = 0;
		}
		break;
	}
}

static int playChunk(ob_chunk * chunk,
		     const AudioFormat * format, double sizeToTime)
{
	pc.elapsedTime = chunk->times;
	pc.bitRate = chunk->bitRate;

	pcm_volumeChange(chunk->data, chunk->chunkSize,
			 format, pc.softwareVolume);

	if (playAudio(chunk->data,
		      chunk->chunkSize) < 0)
		return -1;

	pc.totalPlayTime += sizeToTime * chunk->chunkSize;
	return 0;
}

static void decodeParent(void)
{
	int do_pause = 0;
	int buffering = 1;
	unsigned int bbp = buffered_before_play;
	enum xfade_state do_xfade = XFADE_UNKNOWN;
	unsigned int crossFadeChunks = 0;
	/** the position of the next cross-faded chunk in the next
	    song */
	int nextChunk = 0;
	int decodeWaitedOn = 0;
	static const char silence[CHUNK_SIZE];
	double sizeToTime = 0.0;
	/** the position of the first chunk in the next song */
	int next = -1;

	ob_set_lazy(0);

	if (waitOnDecode(&decodeWaitedOn) < 0) {
		quitDecode();
		return;
	}

	pc.elapsedTime = 0;
	pc.state = PLAYER_STATE_PLAY;
	player_command_finished();

	while (1) {
		processDecodeInput(&do_pause, &bbp, &do_xfade,
				   &decodeWaitedOn, &next);
		if (pc.command == PLAYER_COMMAND_STOP ||
		    pc.command == PLAYER_COMMAND_EXIT ||
		    pc.command == PLAYER_COMMAND_CLOSE_AUDIO) {
			dropBufferedAudio();
			break;
		}

		if (buffering) {
			if (ob_available() < bbp) {
				/* not enough decoded buffer space yet */
				notify_wait(&pc.notify);
				continue;
			} else {
				/* buffering is complete */
				buffering = 0;
				ob_set_lazy(1);
			}
		}

		if (decodeWaitedOn) {
			if (dc.error != DECODE_ERROR_NOERROR) {
				/* the decoder failed */
				assert(dc.next_song == NULL || dc.next_song->url != NULL);
				pc.errored_song = dc.next_song;
				pc.error = PLAYER_ERROR_FILE;
				break;
			}
			else if (dc.state != DECODE_STATE_START) {
				/* the decoder is ready and ok */
				decodeWaitedOn = 0;
				if(openAudioDevice(&(ob.audioFormat))<0) {
					char tmp[MPD_PATH_MAX];
					assert(dc.next_song == NULL || dc.next_song->url != NULL);
					pc.errored_song = dc.next_song;
					pc.error = PLAYER_ERROR_AUDIO;
					ERROR("problems opening audio device "
					      "while playing \"%s\"\n",
					      get_song_url(tmp, dc.next_song));
					break;
				}

				if (do_pause) {
					dropBufferedAudio();
					closeAudioDevice();
				}
				pc.totalTime = dc.totalTime;
				pc.sampleRate = dc.audioFormat.sampleRate;
				pc.bits = dc.audioFormat.bits;
				pc.channels = dc.audioFormat.channels;
				sizeToTime = audioFormatSizeToTime(&ob.audioFormat);
			}
			else {
				/* the decoder is not yet ready; wait
				   some more */
				notify_wait(&pc.notify);
				continue;
			}
		}

		if (dc.state == DECODE_STATE_STOP &&
		    pc.queueState == PLAYER_QUEUE_FULL &&
		    pc.queueLockState == PLAYER_QUEUE_UNLOCKED) {
			/* the decoder has finished the current song;
			   make it decode the next song */
			next = ob.end;
			dc_start_async(pc.next_song);
			pc.queueState = PLAYER_QUEUE_DECODE;
			wakeup_main_task();
		}
		if (next >= 0 && do_xfade == XFADE_UNKNOWN &&
		    dc.command != DECODE_COMMAND_START &&
		    dc.state != DECODE_STATE_START) {
			/* enable cross fading in this song?  if yes,
			   calculate how many chunks will be required
			   for it */
			crossFadeChunks =
				cross_fade_calc(pc.crossFade, dc.totalTime,
						&(ob.audioFormat),
						ob.size -
						buffered_before_play);
			if (crossFadeChunks > 0) {
				do_xfade = XFADE_ENABLED;
				nextChunk = -1;
			} else
				/* cross fading is disabled or the
				   next song is too short */
				do_xfade = XFADE_DISABLED;
		}

		if (do_pause)
			notify_wait(&pc.notify);
		else if (!ob_is_empty() && (int)ob.begin != next) {
			ob_chunk *beginChunk = ob_get_chunk(ob.begin);
			unsigned int fadePosition;
			if (do_xfade == XFADE_ENABLED && next >= 0 &&
			    (fadePosition = ob_relative(next))
			    <= crossFadeChunks) {
				/* perform cross fade */
				if (nextChunk < 0) {
					/* beginning of the cross fade
					   - adjust crossFadeChunks
					   which might be bigger than
					   the remaining number of
					   chunks in the old song */
					crossFadeChunks = fadePosition;
				}
				nextChunk = ob_absolute(crossFadeChunks);
				if (nextChunk >= 0) {
					ob_set_lazy(1);
					cross_fade_apply(beginChunk,
							 ob_get_chunk(nextChunk),
							 &(ob.audioFormat),
							 fadePosition,
							 crossFadeChunks);
				} else {
					/* there are not enough
					   decoded chunks yet */
					if (dc.state == DECODE_STATE_STOP) {
						/* the decoder isn't
						   running, abort
						   cross fading */
						do_xfade = XFADE_DISABLED;
					} else {
						/* wait for the
						   decoder */
						ob_set_lazy(0);
						notify_wait(&pc.notify);
						continue;
					}
				}
			}

			/* play the current chunk */
			if (playChunk(beginChunk, &(ob.audioFormat),
				      sizeToTime) < 0)
				break;
			ob_shift();
			notify_signal(&dc.notify);
		} else if (!ob_is_empty() && (int)ob.begin == next) {
			/* at the beginning of a new song */

			if (do_xfade == XFADE_ENABLED && nextChunk >= 0) {
				/* the cross-fade is finished; skip
				   the section which was cross-faded
				   (and thus already played) */
				ob_skip(crossFadeChunks);
			}

			do_xfade = XFADE_UNKNOWN;

			/* wait for a signal from the playlist */
			if (pc.queueState == PLAYER_QUEUE_DECODE ||
			    pc.queueLockState == PLAYER_QUEUE_LOCKED) {
				notify_wait(&pc.notify);
				continue;
			}
			if (pc.queueState != PLAYER_QUEUE_PLAY)
				break;

			next = -1;
			if (waitOnDecode(&decodeWaitedOn) < 0)
				return;

			pc.queueState = PLAYER_QUEUE_EMPTY;
			wakeup_main_task();
		} else if (dc.state == DECODE_STATE_STOP &&
			   dc.command != DECODE_COMMAND_START) {
			break;
		} else {
			/*DEBUG("waiting for decoded audio, play silence\n");*/
			if (playAudio(silence, CHUNK_SIZE) < 0)
				break;
		}
	}

	quitDecode();
}

/* decode w/ buffering
 * this will fork another process
 * child process does decoding
 * parent process does playing audio
 */
static void decode(void)
{
	ob_clear();

	dc_start(&pc.notify, pc.next_song);
	decodeParent();
}

static void * player_task(mpd_unused void *arg)
{
	notify_enter(&pc.notify);

	while (1) {
		switch (pc.command) {
		case PLAYER_COMMAND_PLAY:
			decode();
			break;

		case PLAYER_COMMAND_STOP:
		case PLAYER_COMMAND_SEEK:
		case PLAYER_COMMAND_PAUSE:
			player_command_finished();
			break;

		case PLAYER_COMMAND_CLOSE_AUDIO:
			closeAudioDevice();
			player_command_finished();
			break;

		case PLAYER_COMMAND_EXIT:
			closeAudioDevice();
			player_command_finished();
			pthread_exit(NULL);
			break;

		case PLAYER_COMMAND_LOCK_QUEUE:
			pc.queueLockState = PLAYER_QUEUE_LOCKED;
			player_command_finished();
			break;

		case PLAYER_COMMAND_UNLOCK_QUEUE:
			pc.queueLockState = PLAYER_QUEUE_UNLOCKED;
			player_command_finished();
			break;

		case PLAYER_COMMAND_NONE:
			notify_wait(&pc.notify);
			break;
		}
	}
	return NULL;
}

void player_create(void)
{
	pthread_attr_t attr;
	pthread_t player_thread;

	pthread_attr_init(&attr);
	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
	if (pthread_create(&player_thread, &attr, player_task, NULL))
		FATAL("Failed to spawn player task: %s\n", strerror(errno));
}