1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (C) 2005 by Miika Pekkarinen
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.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
29 /* Define LOGF_ENABLE to enable logf output in this file */
30 /*#define LOGF_ENABLE*/
39 #include "voice_thread.h"
43 /* Clip sample to signed 16 bit range */
44 static inline int32_t clip_sample_16(int32_t sample
)
46 if ((int16_t)sample
!= sample
)
47 sample
= 0x7fff ^ (sample
>> 31);
52 /* Keep watermark high for iPods at least (2s) */
53 #define PCMBUF_WATERMARK (NATIVE_FREQUENCY * 4 * 2)
55 #define PCMBUF_WATERMARK (NATIVE_FREQUENCY * 1) /* 0.25 seconds */
58 /* Structure we can use to queue pcm chunks in memory to be played
59 * by the driver code. */
64 struct pcmbufdesc
* link
;
65 /* Call this when the buffer has been played */
66 void (*callback
)(void);
69 #define PCMBUF_DESCS(bufsize) \
70 ((bufsize) / PCMBUF_MINAVG_CHUNK)
71 #define PCMBUF_DESCS_SIZE(bufsize) \
72 (PCMBUF_DESCS(bufsize)*sizeof(struct pcmbufdesc))
74 /* Size of the PCM buffer. */
75 static size_t pcmbuf_size IDATA_ATTR
= 0;
76 static char *pcmbuf_bufend IDATA_ATTR
;
77 static char *audiobuffer IDATA_ATTR
;
78 /* Current audio buffer write index. */
79 static size_t audiobuffer_pos IDATA_ATTR
;
80 /* Amount audiobuffer_pos will be increased.*/
81 static size_t audiobuffer_fillpos IDATA_ATTR
;
82 static char *fadebuf IDATA_ATTR
;
83 static char *voicebuf IDATA_ATTR
;
85 static void (*pcmbuf_event_handler
)(void) IDATA_ATTR
;
86 static void (*position_callback
)(size_t size
) IDATA_ATTR
;
88 /* Crossfade related state */
89 static bool crossfade_enabled
;
90 static bool crossfade_enabled_pending
;
91 static bool crossfade_mixmode
;
92 static bool crossfade_active IDATA_ATTR
;
93 static bool crossfade_init IDATA_ATTR
;
95 /* Track the current location for processing crossfade */
96 static struct pcmbufdesc
*crossfade_chunk IDATA_ATTR
;
98 static size_t crossfade_sample IDATA_ATTR
;
100 /* Counters for fading in new data */
101 static size_t crossfade_fade_in_total IDATA_ATTR
;
102 static size_t crossfade_fade_in_rem IDATA_ATTR
;
105 static struct pcmbufdesc
*pcmbuf_read IDATA_ATTR
;
106 static struct pcmbufdesc
*pcmbuf_read_end IDATA_ATTR
;
107 static struct pcmbufdesc
*pcmbuf_write IDATA_ATTR
;
108 static struct pcmbufdesc
*pcmbuf_write_end IDATA_ATTR
;
109 static size_t last_chunksize IDATA_ATTR
;
111 static size_t pcmbuf_unplayed_bytes IDATA_ATTR
;
112 static size_t pcmbuf_watermark IDATA_ATTR
;
114 static struct pcmbufdesc
*pcmbuf_mix_chunk IDATA_ATTR
;
115 static size_t pcmbuf_mix_sample IDATA_ATTR
;
117 static bool low_latency_mode
= false;
118 static bool pcmbuf_flush
;
120 #ifdef HAVE_PRIORITY_SCHEDULING
121 static int codec_thread_priority
= PRIORITY_PLAYBACK
;
124 extern unsigned int codec_thread_id
;
126 /* Helpful macros for use in conditionals this assumes some of the above
127 * static variable names */
128 #define NEED_FLUSH(position) \
129 (audiobuffer_fillpos > PCMBUF_TARGET_CHUNK || position >= pcmbuf_size)
130 #define LOW_DATA(quarter_secs) \
131 (pcmbuf_unplayed_bytes < NATIVE_FREQUENCY * quarter_secs)
133 static bool prepare_insert(size_t length
);
134 static void pcmbuf_under_watermark(bool under
);
135 static bool pcmbuf_flush_fillpos(void);
137 #define CALL_IF_EXISTS(function, args...) if (function) function(args)
138 /* This function has 2 major logical parts (separated by brackets both for
139 * readability and variable scoping). The first part performs the
140 * operastions related to finishing off the last buffer we fed to the DMA.
141 * The second part performs the operations involved in sending a new buffer
142 * to the DMA. Finally the function checks the status of the buffer and
143 * boosts if necessary */
144 static void pcmbuf_callback(unsigned char** start
, size_t* size
) ICODE_ATTR
;
145 static void pcmbuf_callback(unsigned char** start
, size_t* size
)
148 struct pcmbufdesc
*pcmbuf_current
= pcmbuf_read
;
149 /* Take the finished buffer out of circulation */
150 pcmbuf_read
= pcmbuf_current
->link
;
152 /* The buffer is finished, call the callback functions */
153 CALL_IF_EXISTS(position_callback
, last_chunksize
);
154 CALL_IF_EXISTS(pcmbuf_current
->callback
);
156 /* Put the finished buffer back into circulation */
157 pcmbuf_write_end
->link
= pcmbuf_current
;
158 pcmbuf_write_end
= pcmbuf_current
;
160 /* If we've read over the mix chunk while it's still mixing there */
161 if (pcmbuf_current
== pcmbuf_mix_chunk
)
162 pcmbuf_mix_chunk
= NULL
;
163 /* If we've read over the crossfade chunk while it's still fading */
164 if (pcmbuf_current
== crossfade_chunk
)
165 crossfade_chunk
= pcmbuf_read
;
169 /* Send the new buffer to the pcm */
170 struct pcmbufdesc
*pcmbuf_new
= pcmbuf_read
;
171 size_t *realsize
= size
;
172 unsigned char** realstart
= start
;
175 size_t current_size
= pcmbuf_new
->size
;
177 pcmbuf_unplayed_bytes
-= current_size
;
178 last_chunksize
= current_size
;
179 *realsize
= current_size
;
180 *realstart
= pcmbuf_new
->addr
;
184 /* No more buffers */
188 CALL_IF_EXISTS(pcmbuf_event_handler
);
193 void pcmbuf_set_position_callback(void (*callback
)(size_t size
))
195 position_callback
= callback
;
198 static void pcmbuf_set_watermark_bytes(void)
200 pcmbuf_watermark
= (crossfade_enabled
&& pcmbuf_size
) ?
201 /* If crossfading, try to keep the buffer full other than 1 second */
202 (pcmbuf_size
- (NATIVE_FREQUENCY
* 4 * 1)) :
203 /* Otherwise, just use the default */
207 /* This is really just part of pcmbuf_flush_fillpos, but is easier to keep
208 * in a separate function for the moment */
209 static inline void pcmbuf_add_chunk(void)
211 register size_t size
= audiobuffer_fillpos
;
212 /* Grab the next description to write, and change the write pointer */
213 register struct pcmbufdesc
*pcmbuf_current
= pcmbuf_write
;
214 pcmbuf_write
= pcmbuf_current
->link
;
215 /* Fill in the values in the new buffer chunk */
216 pcmbuf_current
->addr
= &audiobuffer
[audiobuffer_pos
];
217 pcmbuf_current
->size
= size
;
218 pcmbuf_current
->callback
= pcmbuf_event_handler
;
219 pcmbuf_current
->link
= NULL
;
220 /* This is single use only */
221 pcmbuf_event_handler
= NULL
;
222 if (pcmbuf_read
!= NULL
) {
225 pcmbuf_write_end
->link
= pcmbuf_read
->link
;
226 pcmbuf_read
->link
= pcmbuf_current
;
227 while (pcmbuf_write_end
->link
)
229 pcmbuf_write_end
= pcmbuf_write_end
->link
;
230 pcmbuf_unplayed_bytes
-= pcmbuf_write_end
->size
;
232 pcmbuf_flush
= false;
234 /* If there is already a read buffer setup, add to it */
236 pcmbuf_read_end
->link
= pcmbuf_current
;
238 /* Otherwise create the buffer */
239 pcmbuf_read
= pcmbuf_current
;
241 /* This is now the last buffer to read */
242 pcmbuf_read_end
= pcmbuf_current
;
244 /* Update bytes counters */
245 pcmbuf_unplayed_bytes
+= size
;
247 audiobuffer_pos
+= size
;
248 if (audiobuffer_pos
>= pcmbuf_size
)
249 audiobuffer_pos
-= pcmbuf_size
;
251 audiobuffer_fillpos
= 0;
254 #ifdef HAVE_PRIORITY_SCHEDULING
255 static void boost_codec_thread(bool boost
)
257 /* Keep voice and codec threads at the same priority or else voice
258 * will starve if the codec thread's priority is boosted. */
261 int priority
= (PRIORITY_PLAYBACK
- PRIORITY_PLAYBACK_MAX
)*pcmbuf_unplayed_bytes
262 / (2*NATIVE_FREQUENCY
) + PRIORITY_PLAYBACK_MAX
;
264 if (priority
!= codec_thread_priority
)
266 codec_thread_priority
= priority
;
267 thread_set_priority(codec_thread_id
, priority
);
268 voice_thread_set_priority(priority
);
271 else if (codec_thread_priority
!= PRIORITY_PLAYBACK
)
273 thread_set_priority(codec_thread_id
, PRIORITY_PLAYBACK
);
274 voice_thread_set_priority(PRIORITY_PLAYBACK
);
275 codec_thread_priority
= PRIORITY_PLAYBACK
;
278 #endif /* HAVE_PRIORITY_SCHEDULING */
280 static void pcmbuf_under_watermark(bool under
)
282 /* Only codec thread initiates boost - voice boosts the cpu when playing
285 if (thread_get_current() == codec_thread_id
)
286 #endif /* SIMULATOR */
290 /* Fill audio buffer by boosting cpu */
292 #ifdef HAVE_PRIORITY_SCHEDULING
293 /* If buffer is critically low, override UI priority, else
294 set back to the original priority. */
295 boost_codec_thread(LOW_DATA(2) && pcm_is_playing());
300 #ifdef HAVE_PRIORITY_SCHEDULING
301 boost_codec_thread(false);
306 /* Disable crossfade if < .5s of audio */
309 crossfade_active
= false;
313 void pcmbuf_set_event_handler(void (*event_handler
)(void))
315 pcmbuf_event_handler
= event_handler
;
318 unsigned int pcmbuf_get_latency(void)
320 /* Be careful how this calculation is rearranged, it's easy to overflow */
321 size_t bytes
= pcmbuf_unplayed_bytes
+ pcm_get_bytes_waiting();
322 return bytes
/ 4 / (NATIVE_FREQUENCY
/1000);
325 void pcmbuf_set_low_latency(bool state
)
327 low_latency_mode
= state
;
330 bool pcmbuf_is_lowdata(void)
332 if (!pcm_is_playing() || pcm_is_paused() ||
333 crossfade_init
|| crossfade_active
)
337 /* 1 seconds of buffer is low data */
340 /* under watermark is low data */
341 return (pcmbuf_unplayed_bytes
< pcmbuf_watermark
);
345 /* Amount of bytes left in the buffer. */
346 inline size_t pcmbuf_free(void)
348 if (pcmbuf_read
!= NULL
)
350 void *read
= pcmbuf_read
->addr
;
351 void *write
= &audiobuffer
[audiobuffer_pos
+ audiobuffer_fillpos
];
353 return (size_t)(read
- write
) + pcmbuf_size
;
355 return (size_t) (read
- write
);
360 bool pcmbuf_crossfade_init(bool manual_skip
)
362 /* Can't do two crossfades at once and, no fade if pcm is off now */
363 if (crossfade_init
|| crossfade_active
|| !pcm_is_playing())
371 /* Not enough data, or crossfade disabled, flush the old data instead */
372 if (LOW_DATA(2) || !pcmbuf_is_crossfade_enabled() || low_latency_mode
)
374 pcmbuf_flush_fillpos();
379 /* Don't enable mix mode when skipping tracks manually. */
381 crossfade_mixmode
= false;
383 crossfade_mixmode
= global_settings
.crossfade_fade_out_mixmode
;
385 crossfade_init
= true;
391 void pcmbuf_play_stop(void)
395 pcmbuf_unplayed_bytes
= 0;
396 pcmbuf_mix_chunk
= NULL
;
398 pcmbuf_write_end
->link
= pcmbuf_read
;
399 pcmbuf_write_end
= pcmbuf_read_end
;
400 pcmbuf_read
= pcmbuf_read_end
= NULL
;
403 audiobuffer_fillpos
= 0;
404 crossfade_init
= false;
405 crossfade_active
= false;
406 pcmbuf_flush
= false;
408 #ifdef HAVE_PRIORITY_SCHEDULING
409 /* Can unboost the codec thread here no matter who's calling */
410 boost_codec_thread(false);
414 int pcmbuf_used_descs(void)
416 struct pcmbufdesc
*pcmbuf_temp
= pcmbuf_read
;
418 while (pcmbuf_temp
) {
419 pcmbuf_temp
= pcmbuf_temp
->link
;
425 int pcmbuf_descs(void)
427 return PCMBUF_DESCS(pcmbuf_size
);
430 static void pcmbuf_init_pcmbuffers(void)
432 struct pcmbufdesc
*next
= pcmbuf_write
;
434 pcmbuf_write_end
= pcmbuf_write
;
435 while ((void *)next
< (void *)pcmbuf_bufend
) {
436 pcmbuf_write_end
->link
=next
;
437 pcmbuf_write_end
=next
;
442 static size_t pcmbuf_get_next_required_pcmbuf_size(void)
446 if (crossfade_enabled_pending
)
447 seconds
+= global_settings
.crossfade_fade_out_delay
448 + global_settings
.crossfade_fade_out_duration
;
451 /* Buffer has to be at least 2s long. */
454 logf("pcmbuf len: %ld", (long)seconds
);
455 return seconds
* (NATIVE_FREQUENCY
*4); /* 2 channels + 2 bytes/sample */
458 static char *pcmbuf_calc_audiobuffer_ptr(size_t bufsize
)
460 return pcmbuf_bufend
- (bufsize
+ PCMBUF_MIX_CHUNK
* 2 +
461 PCMBUF_DESCS_SIZE(bufsize
));
464 bool pcmbuf_is_same_size(void)
466 if (audiobuffer
== NULL
)
467 return true; /* Not set up yet even once so always */
469 size_t bufsize
= pcmbuf_get_next_required_pcmbuf_size();
470 return pcmbuf_calc_audiobuffer_ptr(bufsize
) == audiobuffer
;
473 /* Initialize the pcmbuffer the structure looks like this:
474 * ...|---------PCMBUF---------|FADEBUF|VOICEBUF|DESCS|... */
475 size_t pcmbuf_init(unsigned char *bufend
)
477 pcmbuf_bufend
= bufend
;
478 pcmbuf_size
= pcmbuf_get_next_required_pcmbuf_size();
479 audiobuffer
= pcmbuf_calc_audiobuffer_ptr(pcmbuf_size
);
480 fadebuf
= &audiobuffer
[pcmbuf_size
];
481 voicebuf
= &fadebuf
[PCMBUF_MIX_CHUNK
];
482 pcmbuf_write
= (struct pcmbufdesc
*)&voicebuf
[PCMBUF_MIX_CHUNK
];
484 pcmbuf_init_pcmbuffers();
486 position_callback
= NULL
;
487 pcmbuf_event_handler
= NULL
;
489 pcmbuf_crossfade_enable_finished();
493 return pcmbuf_bufend
- audiobuffer
;
496 size_t pcmbuf_get_bufsize(void)
501 #ifdef ROCKBOX_HAS_LOGF
502 unsigned char * pcmbuf_get_meminfo(size_t *length
)
504 *length
= pcmbuf_bufend
- audiobuffer
;
509 void pcmbuf_pause(bool pause
)
511 if (pcm_is_playing())
512 pcm_play_pause(!pause
);
517 /* Force playback. */
518 void pcmbuf_play_start(void)
520 if (!pcm_is_playing() && pcmbuf_unplayed_bytes
&& pcmbuf_read
!= NULL
)
522 last_chunksize
= pcmbuf_read
->size
;
523 pcmbuf_unplayed_bytes
-= last_chunksize
;
524 pcm_play_data(pcmbuf_callback
,
525 (unsigned char *)pcmbuf_read
->addr
, last_chunksize
);
530 * Commit samples waiting to the pcm buffer.
532 static bool pcmbuf_flush_fillpos(void)
534 if (audiobuffer_fillpos
) {
535 /* Never use the last buffer descriptor */
536 while (pcmbuf_write
== pcmbuf_write_end
) {
537 /* If this happens, something is being stupid */
538 if (!pcm_is_playing()) {
539 logf("pcmbuf_flush_fillpos error");
542 /* Let approximately one chunk of data playback */
543 sleep(HZ
*PCMBUF_TARGET_CHUNK
/(NATIVE_FREQUENCY
*4));
552 * Low memory targets don't have crossfade, so don't compile crossfade
553 * specific code in order to save some memory. */
555 #ifdef HAVE_CROSSFADE
557 * Completely process the crossfade fade out effect with current pcm buffer.
559 static void crossfade_process_buffer(size_t fade_in_delay
,
560 size_t fade_out_delay
, size_t fade_out_rem
)
562 if (!crossfade_mixmode
)
564 /* Fade out the specified amount of the already processed audio */
565 size_t total_fade_out
= fade_out_rem
;
566 size_t fade_out_sample
;
567 struct pcmbufdesc
*fade_out_chunk
= crossfade_chunk
;
569 /* Find the right chunk to start fading out */
570 fade_out_delay
+= crossfade_sample
* 2;
571 while (fade_out_delay
!= 0 && fade_out_delay
>= fade_out_chunk
->size
)
573 fade_out_delay
-= fade_out_chunk
->size
;
574 fade_out_chunk
= fade_out_chunk
->link
;
576 /* The start sample within the chunk */
577 fade_out_sample
= fade_out_delay
/ 2;
579 while (fade_out_rem
> 0)
581 /* Each 1/10 second of audio will have the same fade applied */
582 size_t block_rem
= MIN(NATIVE_FREQUENCY
* 4 / 10, fade_out_rem
);
583 int factor
= (fade_out_rem
<< 8) / total_fade_out
;
585 fade_out_rem
-= block_rem
;
587 /* Fade this block */
588 while (block_rem
> 0 && fade_out_chunk
!= NULL
)
590 /* Fade one sample */
591 int16_t *buf
= (int16_t *)fade_out_chunk
->addr
;
592 int32_t sample
= buf
[fade_out_sample
];
593 buf
[fade_out_sample
++] = (sample
* factor
) >> 8;
596 /* Move to the next chunk as needed */
597 if (fade_out_sample
* 2 >= fade_out_chunk
->size
)
599 fade_out_chunk
= fade_out_chunk
->link
;
606 /* Find the right chunk and sample to start fading in */
607 fade_in_delay
+= crossfade_sample
* 2;
608 while (fade_in_delay
!= 0 && fade_in_delay
>= crossfade_chunk
->size
)
610 fade_in_delay
-= crossfade_chunk
->size
;
611 crossfade_chunk
= crossfade_chunk
->link
;
613 crossfade_sample
= fade_in_delay
/ 2;
614 logf("process done!");
617 /* Initializes crossfader, calculates all necessary parameters and
618 * performs fade-out with the pcm buffer. */
619 static void crossfade_start(void)
621 size_t crossfade_rem
;
622 size_t crossfade_need
;
624 size_t fade_out_delay
;
625 size_t fade_in_delay
;
627 crossfade_init
= false;
628 /* Reject crossfade if less than .5s of data */
630 logf("crossfade rejected");
635 logf("crossfade_start");
636 pcmbuf_flush_fillpos();
637 crossfade_active
= true;
639 /* Initialize the crossfade buffer size to all of the buffered data that
640 * has not yet been sent to the DMA */
641 crossfade_rem
= pcmbuf_unplayed_bytes
;
642 crossfade_chunk
= pcmbuf_read
->link
;
643 crossfade_sample
= 0;
645 /* Get fade out delay from settings. */
647 NATIVE_FREQUENCY
* global_settings
.crossfade_fade_out_delay
* 4;
649 /* Get fade out duration from settings. */
651 NATIVE_FREQUENCY
* global_settings
.crossfade_fade_out_duration
* 4;
653 crossfade_need
= fade_out_delay
+ fade_out_rem
;
654 /* We want only to modify the last part of the buffer. */
655 if (crossfade_rem
> crossfade_need
)
657 size_t crossfade_extra
= crossfade_rem
- crossfade_need
;
658 while (crossfade_extra
> crossfade_chunk
->size
)
660 crossfade_extra
-= crossfade_chunk
->size
;
661 crossfade_chunk
= crossfade_chunk
->link
;
663 crossfade_sample
= crossfade_extra
/ 2;
665 /* Truncate fade out duration if necessary. */
666 else if (crossfade_rem
< crossfade_need
)
668 size_t crossfade_short
= crossfade_need
- crossfade_rem
;
669 if (fade_out_rem
>= crossfade_short
)
670 fade_out_rem
-= crossfade_short
;
673 fade_out_delay
-= crossfade_short
- fade_out_rem
;
678 /* Get also fade in duration and delays from settings. */
679 crossfade_fade_in_total
=
680 NATIVE_FREQUENCY
* global_settings
.crossfade_fade_in_duration
* 4;
681 crossfade_fade_in_rem
= crossfade_fade_in_total
;
684 NATIVE_FREQUENCY
* global_settings
.crossfade_fade_in_delay
* 4;
686 crossfade_process_buffer(fade_in_delay
, fade_out_delay
, fade_out_rem
);
689 /* Returns the number of bytes _NOT_ mixed */
690 static size_t crossfade_mix(int factor
, const char *buf
, size_t length
)
692 const int16_t *input_buf
= (const int16_t *)buf
;
693 int16_t *output_buf
= (int16_t *)(crossfade_chunk
->addr
);
694 int16_t *chunk_end
= SKIPBYTES(output_buf
, crossfade_chunk
->size
);
695 output_buf
= &output_buf
[crossfade_sample
];
700 /* fade left and right channel at once to keep buffer alignment */
702 for (i
= 0; i
< 2; i
++)
704 sample
= *input_buf
++;
705 sample
= ((sample
* factor
) >> 8) + *output_buf
;
706 *output_buf
++ = clip_sample_16(sample
);
709 length
-= 4; /* 2 samples, each 16 bit -> 4 bytes */
711 if (output_buf
>= chunk_end
)
713 crossfade_chunk
= crossfade_chunk
->link
;
714 if (!crossfade_chunk
)
716 output_buf
= (int16_t *)crossfade_chunk
->addr
;
717 chunk_end
= SKIPBYTES(output_buf
, crossfade_chunk
->size
);
720 crossfade_sample
= output_buf
- (int16_t *)crossfade_chunk
->addr
;
724 static void pcmbuf_flush_buffer(const char *buf
, size_t length
)
728 size_t audiobuffer_index
= audiobuffer_pos
+ audiobuffer_fillpos
;
729 if (NEED_FLUSH(audiobuffer_index
))
731 pcmbuf_flush_fillpos();
732 audiobuffer_index
= audiobuffer_pos
+ audiobuffer_fillpos
;
734 copy_n
= MIN(length
, pcmbuf_size
- audiobuffer_index
);
735 memcpy(&audiobuffer
[audiobuffer_index
], buf
, copy_n
);
737 audiobuffer_fillpos
+= copy_n
;
742 static void flush_crossfade(char *buf
, size_t length
)
746 if (crossfade_fade_in_rem
)
751 /* Fade factor for this packet */
753 ((crossfade_fade_in_total
- crossfade_fade_in_rem
) << 8) /
754 crossfade_fade_in_total
;
756 size_t fade_rem
= MIN(length
, crossfade_fade_in_rem
);
758 /* We _will_ fade this many bytes */
759 crossfade_fade_in_rem
-= fade_rem
;
764 size_t fade_total
= fade_rem
;
765 fade_rem
= crossfade_mix(factor
, buf
, fade_rem
);
766 length
-= fade_total
- fade_rem
;
767 buf
+= fade_total
- fade_rem
;
772 samples
= fade_rem
/ 2;
773 input_buf
= (int16_t *)buf
;
774 /* Fade remaining samples in place */
777 int32_t sample
= *input_buf
;
778 *input_buf
++ = (sample
* factor
) >> 8;
785 size_t mix_total
= length
;
786 length
= crossfade_mix(256, buf
, length
);
787 buf
+= mix_total
- length
;
792 /* Flush samples to the buffer */
793 while (!prepare_insert(length
))
795 pcmbuf_flush_buffer(buf
, length
);
801 static bool prepare_insert(size_t length
)
803 if (low_latency_mode
)
806 if (!LOW_DATA(1) && pcm_is_playing())
810 /* Need to save PCMBUF_MIN_CHUNK to prevent wrapping overwriting */
811 if (pcmbuf_free() < length
+ PCMBUF_MIN_CHUNK
)
814 if (!pcm_is_playing())
818 /* Pre-buffer up to watermark */
822 if (pcmbuf_unplayed_bytes
> pcmbuf_watermark
)
825 logf("pcm starting");
826 if (!(audio_status() & AUDIO_STATUS_PAUSE
))
831 pcmbuf_under_watermark(pcmbuf_unplayed_bytes
<= pcmbuf_watermark
);
836 void* pcmbuf_request_buffer(int *count
)
838 #ifdef HAVE_CROSSFADE
843 if (crossfade_active
) {
844 *count
= MIN(*count
, PCMBUF_MIX_CHUNK
/4);
849 if(prepare_insert(*count
<< 2))
851 size_t audiobuffer_index
= audiobuffer_pos
+ audiobuffer_fillpos
;
852 if (pcmbuf_size
- audiobuffer_index
>= PCMBUF_MIN_CHUNK
)
854 /* Usual case, there's space here */
855 return &audiobuffer
[audiobuffer_index
];
859 /* Flush and wrap the buffer */
860 pcmbuf_flush_fillpos();
862 return &audiobuffer
[0];
872 void * pcmbuf_request_voice_buffer(int *count
)
874 /* A get-it-to-work-for-now hack (audio status could change by
876 if (audio_status() & AUDIO_STATUS_PLAY
)
878 if (pcmbuf_read
== NULL
)
882 else if (pcmbuf_usage() >= 10 && pcmbuf_mix_free() >= 30 &&
883 (pcmbuf_mix_chunk
|| pcmbuf_read
->link
))
885 *count
= MIN(*count
, PCMBUF_MIX_CHUNK
/4);
895 return pcmbuf_request_buffer(count
);
899 bool pcmbuf_is_crossfade_active(void)
901 return crossfade_active
|| crossfade_init
;
904 void pcmbuf_write_complete(int count
)
906 size_t length
= (size_t)(unsigned int)count
<< 2;
907 #ifdef HAVE_CROSSFADE
908 if (crossfade_active
)
910 flush_crossfade(fadebuf
, length
);
911 if (!(crossfade_fade_in_rem
|| crossfade_chunk
))
912 crossfade_active
= false;
917 audiobuffer_fillpos
+= length
;
919 if (NEED_FLUSH(audiobuffer_pos
+ audiobuffer_fillpos
))
920 pcmbuf_flush_fillpos();
924 #ifndef HAVE_HARDWARE_BEEP
925 #define MINIBUF_SAMPLES (NATIVE_FREQUENCY / 1000 * KEYCLICK_DURATION)
926 #define MINIBUF_SIZE (MINIBUF_SAMPLES*4)
928 /* Generates a constant square wave sound with a given frequency
929 in Hertz for a duration in milliseconds. */
930 void pcmbuf_beep(unsigned int frequency
, size_t duration
, int amplitude
)
932 unsigned int step
= 0xffffffffu
/ NATIVE_FREQUENCY
* frequency
;
934 int16_t *bufptr
, *bufstart
, *bufend
;
936 int nsamples
= NATIVE_FREQUENCY
/ 1000 * duration
;
937 bool mix
= pcmbuf_read
!= NULL
&& pcmbuf_read
->link
!= NULL
;
940 bufend
= SKIPBYTES((int16_t *)audiobuffer
, pcmbuf_size
);
942 /* Find the insertion point and set bufstart to the start of it */
945 /* Get the currently playing chunk at the current position. */
946 bufstart
= (int16_t *)pcm_play_dma_get_peak_buffer(&i
);
948 /* If above isn't implemented or pcm is stopped, no beepeth. */
949 if (!bufstart
|| !pcm_is_playing())
952 /* Give 5ms clearance. */
953 bufstart
+= NATIVE_FREQUENCY
* 4 / 200;
955 #ifdef HAVE_PCM_DMA_ADDRESS
956 /* Returned peak addresses are DMA addresses */
957 bufend
= pcm_dma_addr(bufend
);
961 if (bufstart
>= bufend
)
962 bufstart
-= pcmbuf_size
;
964 /* NOTE: On some targets using hardware DMA, cache range flushing may
965 * be required or the writes may not be picked up by the controller.
966 * An incremental flush should be done periodically during the mixdown. */
968 else if (nsamples
<= MINIBUF_SAMPLES
)
970 static int16_t minibuf
[MINIBUF_SAMPLES
*2] __attribute__((aligned(4)));
971 /* Use mini buffer */
973 bufend
= SKIPBYTES(bufstart
, MINIBUF_SIZE
);
975 else if (audio_buffer_state() != AUDIOBUF_STATE_TRASHED
)
977 /* Use audiobuffer */
978 bufstart
= (int16_t *)audiobuffer
;
988 /* Mix square wave into buffer */
989 for (i
= 0; i
< nsamples
; ++i
)
991 int32_t amp
= (phase
>> 31) ^ (int32_t)amplitude
;
992 sample
= mix
? *bufptr
: 0;
993 *bufptr
++ = clip_sample_16(sample
+ amp
);
994 if (bufptr
>= bufend
)
995 bufptr
= (int16_t *)audiobuffer
;
996 sample
= mix
? *bufptr
: 0;
997 *bufptr
++ = clip_sample_16(sample
+ amp
);
998 if (bufptr
>= bufend
)
999 bufptr
= (int16_t *)audiobuffer
;
1005 #ifdef HAVE_RECORDING
1009 /* Kick off playback if required and it won't interfere */
1010 if (!pcm_is_playing()
1011 #ifdef HAVE_RECORDING
1012 && !pcm_is_recording()
1016 pcm_play_data(NULL
, (unsigned char *)bufstart
, nsamples
* 4);
1020 #ifdef HAVE_RECORDING
1024 #endif /* HAVE_HARDWARE_BEEP */
1026 /* Returns pcm buffer usage in percents (0 to 100). */
1027 int pcmbuf_usage(void)
1029 return pcmbuf_unplayed_bytes
* 100 / pcmbuf_size
;
1032 int pcmbuf_mix_free(void)
1034 if (pcmbuf_mix_chunk
)
1037 (size_t)&((int16_t *)pcmbuf_mix_chunk
->addr
)[pcmbuf_mix_sample
];
1038 size_t my_write_pos
= (size_t)&audiobuffer
[audiobuffer_pos
];
1039 if (my_write_pos
< my_mix_end
)
1040 my_write_pos
+= pcmbuf_size
;
1041 return (my_write_pos
- my_mix_end
) * 100 / pcmbuf_unplayed_bytes
;
1046 void pcmbuf_write_voice_complete(int count
)
1048 /* A get-it-to-work-for-now hack (audio status could have changed) */
1049 if (!(audio_status() & AUDIO_STATUS_PLAY
))
1051 pcmbuf_write_complete(count
);
1055 int16_t *ibuf
= (int16_t *)voicebuf
;
1057 size_t chunk_samples
;
1059 if (pcmbuf_mix_chunk
== NULL
&& pcmbuf_read
!= NULL
)
1061 pcmbuf_mix_chunk
= pcmbuf_read
->link
;
1062 /* Start 1/8s into the next chunk */
1063 pcmbuf_mix_sample
= NATIVE_FREQUENCY
* 4 / 16;
1066 if (!pcmbuf_mix_chunk
)
1069 obuf
= (int16_t *)pcmbuf_mix_chunk
->addr
;
1070 chunk_samples
= pcmbuf_mix_chunk
->size
/ sizeof (int16_t);
1076 int32_t sample
= *ibuf
++;
1078 if (pcmbuf_mix_sample
>= chunk_samples
)
1080 pcmbuf_mix_chunk
= pcmbuf_mix_chunk
->link
;
1081 if (!pcmbuf_mix_chunk
)
1083 pcmbuf_mix_sample
= 0;
1084 obuf
= pcmbuf_mix_chunk
->addr
;
1085 chunk_samples
= pcmbuf_mix_chunk
->size
/ 2;
1087 sample
+= obuf
[pcmbuf_mix_sample
] >> 2;
1088 obuf
[pcmbuf_mix_sample
++] = clip_sample_16(sample
);
1092 void pcmbuf_crossfade_enable(bool on_off
)
1094 /* Next setting to be used, not applied now */
1095 crossfade_enabled_pending
= on_off
;
1098 void pcmbuf_crossfade_enable_finished(void)
1100 /* Copy the pending setting over now */
1101 crossfade_enabled
= crossfade_enabled_pending
;
1102 pcmbuf_set_watermark_bytes();
1105 bool pcmbuf_is_crossfade_enabled(void)
1107 if (global_settings
.crossfade
== CROSSFADE_ENABLE_SHUFFLE
)
1108 return global_settings
.playlist_shuffle
;
1110 return crossfade_enabled
;
1113 /** PLAY LAST REMAINING SAMPLES AT END OF PLAYBACK
1114 * Commit any remaining samples in the PCM buffer for playback. */
1115 void pcmbuf_play_remainder(void)
1117 if (audiobuffer_fillpos
)
1118 pcmbuf_flush_fillpos();