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 ****************************************************************************/
30 /* Define LOGF_ENABLE to enable logf output in this file */
31 /*#define LOGF_ENABLE*/
39 #include "voice_thread.h"
42 #define PCMBUF_TARGET_CHUNK 32768 /* This is the target fill size of chunks
44 #define PCMBUF_MINAVG_CHUNK 24576 /* This is the minimum average size of
45 chunks on the pcm buffer (or we run out
46 of buffer descriptors, which is
48 #define PCMBUF_MIN_CHUNK 4096 /* We try to never feed a chunk smaller than
50 #define CROSSFADE_BUFSIZE 8192 /* Size of the crossfade buffer */
51 #define AUX_BUFSIZE 512 /* Size of the aux buffer; can be 512 if no
52 resampling or timestretching is allowed in
53 the aux channel, must be 2048 otherwise */
55 /* number of bytes played per second (sample rate * 2 channels * 2 bytes/sample) */
56 #define BYTERATE (NATIVE_FREQUENCY * 4)
59 /* Keep watermark high for iPods at least (2s) */
60 #define PCMBUF_WATERMARK (BYTERATE * 2)
62 #define PCMBUF_WATERMARK (BYTERATE / 4) /* 0.25 seconds */
65 /* Structure we can use to queue pcm chunks in memory to be played
66 * by the driver code. */
71 struct chunkdesc
* link
;
72 /* true if last chunk in the track */
76 #define NUM_CHUNK_DESCS(bufsize) \
77 ((bufsize) / PCMBUF_MINAVG_CHUNK)
79 /* Size of the PCM buffer. */
80 static size_t pcmbuf_size IDATA_ATTR
= 0;
81 static char *pcmbuf_bufend IDATA_ATTR
;
82 static char *pcmbuffer IDATA_ATTR
;
83 /* Current PCM buffer write index. */
84 static size_t pcmbuffer_pos IDATA_ATTR
;
85 /* Amount pcmbuffer_pos will be increased.*/
86 static size_t pcmbuffer_fillpos IDATA_ATTR
;
88 /* Gapless playback */
89 static bool end_of_track IDATA_ATTR
;
90 bool track_transition IDATA_ATTR
;
93 /* Crossfade buffer */
94 static char *fadebuf IDATA_ATTR
;
96 /* Crossfade related state */
97 static bool crossfade_enabled
;
98 static bool crossfade_enable_request
;
99 static bool crossfade_mixmode
;
100 static bool crossfade_auto_skip
;
101 static bool crossfade_active IDATA_ATTR
;
102 static bool crossfade_track_change_started IDATA_ATTR
;
104 /* Track the current location for processing crossfade */
105 static struct chunkdesc
*crossfade_chunk IDATA_ATTR
;
106 static size_t crossfade_sample IDATA_ATTR
;
108 /* Counters for fading in new data */
109 static size_t crossfade_fade_in_total IDATA_ATTR
;
110 static size_t crossfade_fade_in_rem IDATA_ATTR
;
113 static struct chunkdesc
*read_chunk IDATA_ATTR
;
114 static struct chunkdesc
*read_end_chunk IDATA_ATTR
;
115 static struct chunkdesc
*write_chunk IDATA_ATTR
;
116 static struct chunkdesc
*write_end_chunk IDATA_ATTR
;
117 static size_t last_chunksize IDATA_ATTR
;
119 static size_t pcmbuf_unplayed_bytes IDATA_ATTR
;
120 static size_t pcmbuf_watermark IDATA_ATTR
;
123 static char *voicebuf IDATA_ATTR
;
124 static struct chunkdesc
*mix_chunk IDATA_ATTR
;
125 static size_t pcmbuf_mix_sample IDATA_ATTR
;
127 static bool low_latency_mode
= false;
128 static bool flush_pcmbuf
= false;
130 #ifdef HAVE_PRIORITY_SCHEDULING
131 static int codec_thread_priority
= PRIORITY_PLAYBACK
;
134 extern unsigned int codec_thread_id
;
136 /* Helpful macros for use in conditionals this assumes some of the above
137 * static variable names */
138 #define COMMIT_IF_NEEDED if(pcmbuffer_fillpos > PCMBUF_TARGET_CHUNK || \
139 (pcmbuffer_pos + pcmbuffer_fillpos) >= pcmbuf_size) commit_chunk(false)
140 #define LOW_DATA(quarter_secs) \
141 (pcmbuf_unplayed_bytes < NATIVE_FREQUENCY * quarter_secs)
143 #ifdef HAVE_CROSSFADE
144 static void crossfade_start(void);
145 static void write_to_crossfade(size_t length
);
146 static void pcmbuf_finish_crossfade_enable(void);
150 /**************************************/
152 /* define this to show detailed chunkdesc usage information on the sim console */
153 /*#define DESC_DEBUG*/
159 static struct chunkdesc
*first_desc
;
160 static bool show_desc_in_use
= false;
161 #define DISPLAY_DESC(caller) while(!show_desc(caller))
162 #define DESC_IDX(desc) (desc ? desc - first_desc : -1)
163 #define SHOW_DESC(desc) if(DESC_IDX(desc)==-1) DEBUGF("--"); \
164 else DEBUGF("%02d", DESC_IDX(desc))
165 #define SHOW_DESC_LINK(desc) if(desc){SHOW_DESC(desc->link);DEBUGF(" ");} \
167 #define SHOW_DETAIL(desc) DEBUGF(":");SHOW_DESC(desc); DEBUGF(">"); \
169 #define SHOW_POINT(tag,desc) DEBUGF("%s",tag);SHOW_DETAIL(desc)
170 #define SHOW_NUM(num,desc) DEBUGF("%02d>",num);SHOW_DESC_LINK(desc)
172 static bool show_desc(char *caller
)
174 if (show_desc_in_use
) return false;
175 show_desc_in_use
= true;
176 DEBUGF("%-14s\t", caller
);
177 SHOW_POINT("r", read_chunk
);
178 SHOW_POINT("re", read_end_chunk
);
180 SHOW_POINT("w", write_chunk
);
181 SHOW_POINT("we", write_end_chunk
);
184 for (i
= 0; i
< pcmbuf_descs(); i
++)
186 SHOW_NUM(i
, (first_desc
+ i
));
187 if (i
%10 == 9) DEBUGF("\n");
190 show_desc_in_use
= false;
194 #define DISPLAY_DESC(caller) do{}while(0)
198 /** Accept new PCM data */
200 /* Commit PCM buffer samples as a new chunk for playback */
201 static void commit_chunk(bool flush_next_time
)
203 if (!pcmbuffer_fillpos
)
206 /* Never use the last buffer descriptor */
207 while (write_chunk
== write_end_chunk
) {
208 /* If this happens, something is being stupid */
209 if (!pcm_is_playing()) {
210 logf("commit_chunk error");
213 /* Let approximately one chunk of data playback */
214 sleep(HZ
* PCMBUF_TARGET_CHUNK
/ BYTERATE
);
217 /* commit the chunk */
219 register size_t size
= pcmbuffer_fillpos
;
220 /* Grab the next description to write, and change the write pointer */
221 register struct chunkdesc
*pcmbuf_current
= write_chunk
;
222 write_chunk
= pcmbuf_current
->link
;
223 /* Fill in the values in the new buffer chunk */
224 pcmbuf_current
->addr
= &pcmbuffer
[pcmbuffer_pos
];
225 pcmbuf_current
->size
= size
;
226 pcmbuf_current
->end_of_track
= end_of_track
;
227 pcmbuf_current
->link
= NULL
;
228 end_of_track
= false; /* This is single use only */
230 if (read_chunk
!= NULL
)
234 /* Flush! Discard all data after the currently playing chunk,
235 and make the current chunk play next */
236 logf("commit_chunk: flush");
237 write_end_chunk
->link
= read_chunk
->link
;
238 read_chunk
->link
= pcmbuf_current
;
239 while (write_end_chunk
->link
)
241 write_end_chunk
= write_end_chunk
->link
;
242 pcmbuf_unplayed_bytes
-= write_end_chunk
->size
;
245 /* If there is already a read buffer setup, add to it */
247 read_end_chunk
->link
= pcmbuf_current
;
251 /* Otherwise create the buffer */
252 read_chunk
= pcmbuf_current
;
255 /* If flush_next_time is true, then the current chunk will be thrown out
256 * and the next chunk to be committed will be the next to be played.
257 * This is used to empty the PCM buffer for a track change. */
258 flush_pcmbuf
= flush_next_time
;
260 /* This is now the last buffer to read */
261 read_end_chunk
= pcmbuf_current
;
263 /* Update bytes counters */
264 pcmbuf_unplayed_bytes
+= size
;
266 pcmbuffer_pos
+= size
;
267 if (pcmbuffer_pos
>= pcmbuf_size
)
268 pcmbuffer_pos
-= pcmbuf_size
;
270 pcmbuffer_fillpos
= 0;
271 DISPLAY_DESC("commit_chunk");
274 /* Set priority of the codec thread */
275 #ifdef HAVE_PRIORITY_SCHEDULING
276 static void boost_codec_thread(bool boost
)
278 /* Keep voice and codec threads at the same priority or else voice
279 * will starve if the codec thread's priority is boosted. */
282 int priority
= (PRIORITY_PLAYBACK
- PRIORITY_PLAYBACK_MAX
)*pcmbuf_unplayed_bytes
283 / (2*NATIVE_FREQUENCY
) + PRIORITY_PLAYBACK_MAX
;
285 if (priority
!= codec_thread_priority
)
287 codec_thread_priority
= priority
;
288 thread_set_priority(codec_thread_id
, priority
);
289 voice_thread_set_priority(priority
);
292 else if (codec_thread_priority
!= PRIORITY_PLAYBACK
)
294 thread_set_priority(codec_thread_id
, PRIORITY_PLAYBACK
);
295 voice_thread_set_priority(PRIORITY_PLAYBACK
);
296 codec_thread_priority
= PRIORITY_PLAYBACK
;
300 #define boost_codec_thread(boost) do{}while(0)
301 #endif /* HAVE_PRIORITY_SCHEDULING */
303 /* Return true if the PCM buffer is able to receive new data.
304 * Also maintain buffer level above the watermark. */
305 static bool prepare_insert(size_t length
)
307 if (low_latency_mode
)
310 if (!LOW_DATA(1) && pcm_is_playing())
314 /* Need to save PCMBUF_MIN_CHUNK to prevent wrapping overwriting */
315 if (pcmbuf_free() < length
+ PCMBUF_MIN_CHUNK
)
318 /* Maintain the buffer level above the watermark */
319 if (pcm_is_playing())
321 /* Only codec thread initiates boost - voice boosts the cpu when playing
324 if (thread_get_current() == codec_thread_id
)
325 #endif /* SIMULATOR */
327 if (pcmbuf_unplayed_bytes
<= pcmbuf_watermark
)
329 /* Fill PCM buffer by boosting cpu */
331 /* If buffer is critically low, override UI priority, else
332 set back to the original priority. */
333 boost_codec_thread(LOW_DATA(2));
337 boost_codec_thread(false);
341 #ifdef HAVE_CROSSFADE
342 /* Disable crossfade if < .5s of audio */
345 crossfade_active
= false;
349 else /* pcm_is_playing */
351 /* Boost CPU for pre-buffer */
354 /* If pre-buffered to the watermark, start playback */
358 if (pcmbuf_unplayed_bytes
> pcmbuf_watermark
)
361 logf("pcm starting");
362 if (!(audio_status() & AUDIO_STATUS_PAUSE
))
370 /* Request space in the buffer for writing output samples */
371 void *pcmbuf_request_buffer(int *count
)
373 #ifdef HAVE_CROSSFADE
374 /* we're going to crossfade to a new track, which is now on its way */
375 if (crossfade_track_change_started
)
378 /* crossfade has begun, put the new track samples in fadebuf */
379 if (crossfade_active
)
381 *count
= MIN(*count
, CROSSFADE_BUFSIZE
/4);
386 /* if possible, reserve room in the PCM buffer for new samples */
388 if(prepare_insert(*count
<< 2))
390 size_t pcmbuffer_index
= pcmbuffer_pos
+ pcmbuffer_fillpos
;
391 if (pcmbuf_size
- pcmbuffer_index
>= PCMBUF_MIN_CHUNK
)
393 /* Usual case, there's space here */
394 return &pcmbuffer
[pcmbuffer_index
];
398 /* Wrap the buffer, the new samples go at the beginning */
401 return &pcmbuffer
[0];
405 /* PCM buffer not ready to receive new data yet */
409 /* Handle new samples to the buffer */
410 void pcmbuf_write_complete(int count
)
412 size_t length
= (size_t)(unsigned int)count
<< 2;
413 #ifdef HAVE_CROSSFADE
414 if (crossfade_active
)
415 write_to_crossfade(length
);
419 pcmbuffer_fillpos
+= length
;
427 static inline void init_pcmbuffers(void)
430 first_desc
= write_chunk
;
432 struct chunkdesc
*next
= write_chunk
;
434 write_end_chunk
= write_chunk
;
435 while ((void *)next
< (void *)pcmbuf_bufend
) {
436 write_end_chunk
->link
=next
;
437 write_end_chunk
=next
;
440 DISPLAY_DESC("init");
443 static size_t get_next_required_pcmbuf_size(void)
447 #ifdef HAVE_CROSSFADE
448 if (crossfade_enable_request
)
449 seconds
+= global_settings
.crossfade_fade_out_delay
+
450 global_settings
.crossfade_fade_out_duration
;
454 /* Buffer has to be at least 2s long. */
457 logf("pcmbuf len: %ld", (long)seconds
);
458 return seconds
* BYTERATE
;
461 /* Initialize the pcmbuffer the structure looks like this:
462 * ...|---------PCMBUF---------|FADEBUF|VOICEBUF|DESCS|... */
463 size_t pcmbuf_init(unsigned char *bufend
)
465 pcmbuf_bufend
= bufend
;
466 pcmbuf_size
= get_next_required_pcmbuf_size();
467 write_chunk
= (struct chunkdesc
*)pcmbuf_bufend
-
468 NUM_CHUNK_DESCS(pcmbuf_size
);
469 voicebuf
= (char *)write_chunk
- AUX_BUFSIZE
;
470 #ifdef HAVE_CROSSFADE
471 fadebuf
= voicebuf
- CROSSFADE_BUFSIZE
;
472 pcmbuffer
= fadebuf
- pcmbuf_size
;
474 pcmbuffer
= voicebuf
- pcmbuf_size
;
479 #ifdef HAVE_CROSSFADE
480 pcmbuf_finish_crossfade_enable();
482 pcmbuf_watermark
= PCMBUF_WATERMARK
;
487 return pcmbuf_bufend
- pcmbuffer
;
493 void pcmbuf_start_track_change(bool auto_skip
)
495 bool crossfade
= false;
496 #ifdef HAVE_CROSSFADE
497 /* Determine whether this track change needs to crossfade */
498 if(crossfade_enabled
&& !pcmbuf_is_crossfade_active())
500 switch(global_settings
.crossfade
)
502 case CROSSFADE_ENABLE_AUTOSKIP
:
503 crossfade
= auto_skip
;
505 case CROSSFADE_ENABLE_MANSKIP
:
506 crossfade
= !auto_skip
;
508 case CROSSFADE_ENABLE_SHUFFLE
:
509 crossfade
= global_settings
.playlist_shuffle
;
511 case CROSSFADE_ENABLE_SHUFFLE_OR_MANSKIP
:
512 crossfade
= global_settings
.playlist_shuffle
|| !auto_skip
;
514 case CROSSFADE_ENABLE_ALWAYS
:
521 if (!auto_skip
|| crossfade
)
522 /* manual skip or crossfade */
525 { logf(" crossfade track change"); }
527 { logf(" manual track change"); }
529 /* Notify the wps that the track change starts now */
530 audio_post_track_change(false);
532 /* Can't do two crossfades at once and, no fade if pcm is off now */
534 #ifdef HAVE_CROSSFADE
535 pcmbuf_is_crossfade_active() ||
545 /* Not enough data, or not crossfading, flush the old data instead */
546 if (LOW_DATA(2) || !crossfade
|| low_latency_mode
)
552 #ifdef HAVE_CROSSFADE
553 /* Don't enable mix mode when skipping tracks manually. */
554 crossfade_mixmode
= auto_skip
&& global_settings
.crossfade_fade_out_mixmode
;
556 crossfade_auto_skip
= auto_skip
;
558 crossfade_track_change_started
= crossfade
;
561 else /* automatic and not crossfading, so do gapless track change */
563 /* The codec is moving on to the next track, but the current track will
564 * continue to play. Set a flag to make sure the elapsed time of the
565 * current track will be updated properly, and mark the current chunk
566 * as the last one in the track. */
567 logf(" gapless track change");
568 track_transition
= true;
576 /* PCM driver callback
577 * This function has 3 major logical parts (separated by brackets both for
578 * readability and variable scoping). The first part performs the
579 * operations related to finishing off the last chunk we fed to the DMA.
580 * The second part detects the end of playlist condition when the PCM
581 * buffer is empty except for uncommitted samples. Then they are committed
582 * and sent to the PCM driver for playback. The third part performs the
583 * operations involved in sending a new chunk to the DMA. */
584 static void pcmbuf_pcm_callback(unsigned char** start
, size_t* size
) ICODE_ATTR
;
585 static void pcmbuf_pcm_callback(unsigned char** start
, size_t* size
)
588 struct chunkdesc
*pcmbuf_current
= read_chunk
;
589 /* Take the finished chunk out of circulation */
590 read_chunk
= pcmbuf_current
->link
;
592 /* if during a track transition, update the elapsed time in ms */
593 if (track_transition
)
594 audio_pcmbuf_position_callback(last_chunksize
* 1000 / BYTERATE
);
596 /* if last chunk in the track, stop updates and notify audio thread */
597 if (pcmbuf_current
->end_of_track
)
599 track_transition
= false;
600 audio_post_track_change(true);
603 /* Put the finished chunk back into circulation */
604 write_end_chunk
->link
= pcmbuf_current
;
605 write_end_chunk
= pcmbuf_current
;
607 /* If we've read over the mix chunk while it's still mixing there */
608 if (pcmbuf_current
== mix_chunk
)
611 #ifdef HAVE_CROSSFADE
612 /* If we've read over the crossfade chunk while it's still fading */
613 if (pcmbuf_current
== crossfade_chunk
)
614 crossfade_chunk
= read_chunk
;
619 /* Commit last samples at end of playlist */
620 if (pcmbuffer_fillpos
&& !read_chunk
)
622 logf("pcmbuf_pcm_callback: commit last samples");
628 /* Send the new chunk to the DMA */
631 last_chunksize
= read_chunk
->size
;
632 pcmbuf_unplayed_bytes
-= last_chunksize
;
633 *size
= last_chunksize
;
634 *start
= read_chunk
->addr
;
639 logf("pcmbuf_pcm_callback: no more chunks");
645 DISPLAY_DESC("callback");
649 void pcmbuf_play_start(void)
651 if (!pcm_is_playing() && pcmbuf_unplayed_bytes
&& read_chunk
!= NULL
)
653 logf("pcmbuf_play_start");
654 last_chunksize
= read_chunk
->size
;
655 pcmbuf_unplayed_bytes
-= last_chunksize
;
656 pcm_play_data(pcmbuf_pcm_callback
,
657 read_chunk
->addr
, last_chunksize
);
661 void pcmbuf_play_stop(void)
663 logf("pcmbuf_play_stop");
666 pcmbuf_unplayed_bytes
= 0;
669 write_end_chunk
->link
= read_chunk
;
670 write_end_chunk
= read_end_chunk
;
671 read_chunk
= read_end_chunk
= NULL
;
674 pcmbuffer_fillpos
= 0;
675 #ifdef HAVE_CROSSFADE
676 crossfade_track_change_started
= false;
677 crossfade_active
= false;
679 end_of_track
= false;
680 track_transition
= false;
681 flush_pcmbuf
= false;
682 DISPLAY_DESC("play_stop");
684 /* Can unboost the codec thread here no matter who's calling */
685 boost_codec_thread(false);
688 void pcmbuf_pause(bool pause
)
690 logf("pcmbuf_pause: %s", pause
?"pause":"play");
691 if (pcm_is_playing())
692 pcm_play_pause(!pause
);
700 /* Clip sample to signed 16 bit range */
701 static inline int32_t clip_sample_16(int32_t sample
)
703 if ((int16_t)sample
!= sample
)
704 sample
= 0x7fff ^ (sample
>> 31);
708 #ifdef HAVE_CROSSFADE
709 /* Find the chunk that's (length) deep in the list. Return the position within
710 * the chunk, and leave the chunkdesc pointer pointing to the chunk. */
711 static size_t find_chunk(size_t length
, struct chunkdesc
**chunk
)
713 while (*chunk
&& length
>= (*chunk
)->size
)
715 length
-= (*chunk
)->size
;
716 *chunk
= (*chunk
)->link
;
721 /* Returns the number of bytes _NOT_ mixed/faded */
722 static size_t crossfade_mix_fade(int factor
, size_t length
, const char *buf
,
723 size_t *out_sample
, struct chunkdesc
**out_chunk
)
728 const int16_t *input_buf
= (const int16_t *)buf
;
729 int16_t *output_buf
= (int16_t *)((*out_chunk
)->addr
);
730 int16_t *chunk_end
= SKIPBYTES(output_buf
, (*out_chunk
)->size
);
731 output_buf
= &output_buf
[*out_sample
];
736 /* fade left and right channel at once to keep buffer alignment */
738 for (i
= 0; i
< 2; i
++)
741 /* fade the input buffer and mix into the chunk */
743 sample
= *input_buf
++;
744 sample
= ((sample
* factor
) >> 8) + *output_buf
;
745 *output_buf
++ = clip_sample_16(sample
);
748 /* fade the chunk only */
750 sample
= *output_buf
;
751 *output_buf
++ = (sample
* factor
) >> 8;
755 length
-= 4; /* 2 samples, each 16 bit -> 4 bytes */
757 /* move to next chunk as needed */
758 if (output_buf
>= chunk_end
)
760 *out_chunk
= (*out_chunk
)->link
;
763 output_buf
= (int16_t *)((*out_chunk
)->addr
);
764 chunk_end
= SKIPBYTES(output_buf
, (*out_chunk
)->size
);
767 *out_sample
= output_buf
- (int16_t *)((*out_chunk
)->addr
);
771 /* Initializes crossfader, calculates all necessary parameters and performs
772 * fade-out with the PCM buffer. */
773 static void crossfade_start(void)
775 size_t crossfade_rem
;
776 size_t crossfade_need
;
778 size_t fade_out_delay
;
779 size_t fade_in_delay
;
781 crossfade_track_change_started
= false;
782 /* Reject crossfade if less than .5s of data */
784 logf("crossfade rejected");
789 logf("crossfade_start");
791 crossfade_active
= true;
793 /* Initialize the crossfade buffer size to all of the buffered data that
794 * has not yet been sent to the DMA */
795 crossfade_rem
= pcmbuf_unplayed_bytes
;
796 crossfade_chunk
= read_chunk
->link
;
797 crossfade_sample
= 0;
799 /* Get fade out info from settings. */
800 fade_out_delay
= global_settings
.crossfade_fade_out_delay
* BYTERATE
;
801 fade_out_rem
= global_settings
.crossfade_fade_out_duration
* BYTERATE
;
803 crossfade_need
= fade_out_delay
+ fade_out_rem
;
804 if (crossfade_rem
> crossfade_need
)
806 if (crossfade_auto_skip
)
807 /* Automatic track changes only modify the last part of the buffer,
808 * so find the right chunk and sample to start the crossfade */
810 crossfade_sample
= find_chunk(crossfade_rem
- crossfade_need
,
811 &crossfade_chunk
) / 2;
812 crossfade_rem
= crossfade_need
;
815 /* Manual skips occur immediately, but give time to process */
817 crossfade_rem
-= crossfade_chunk
->size
;
818 crossfade_chunk
= crossfade_chunk
->link
;
821 /* Truncate fade out duration if necessary. */
822 if (crossfade_rem
< crossfade_need
)
824 size_t crossfade_short
= crossfade_need
- crossfade_rem
;
825 if (fade_out_rem
>= crossfade_short
)
826 fade_out_rem
-= crossfade_short
;
829 fade_out_delay
-= crossfade_short
- fade_out_rem
;
833 crossfade_rem
-= fade_out_delay
+ fade_out_rem
;
835 /* Completely process the crossfade fade-out effect with current PCM buffer */
836 if (!crossfade_mixmode
)
838 /* Fade out the specified amount of the already processed audio */
839 size_t total_fade_out
= fade_out_rem
;
840 size_t fade_out_sample
;
841 struct chunkdesc
*fade_out_chunk
= crossfade_chunk
;
843 /* Find the right chunk and sample to start fading out */
844 fade_out_delay
+= crossfade_sample
* 2;
845 fade_out_sample
= find_chunk(fade_out_delay
, &fade_out_chunk
) / 2;
847 while (fade_out_rem
> 0)
849 /* Each 1/10 second of audio will have the same fade applied */
850 size_t block_rem
= MIN(BYTERATE
/ 10, fade_out_rem
);
851 int factor
= (fade_out_rem
<< 8) / total_fade_out
;
853 fade_out_rem
-= block_rem
;
855 crossfade_mix_fade(factor
, block_rem
, NULL
,
856 &fade_out_sample
, &fade_out_chunk
);
859 /* zero out the rest of the buffer */
860 crossfade_mix_fade(0, crossfade_rem
, NULL
,
861 &fade_out_sample
, &fade_out_chunk
);
864 /* Initialize fade-in counters */
865 crossfade_fade_in_total
= global_settings
.crossfade_fade_in_duration
* BYTERATE
;
866 crossfade_fade_in_rem
= crossfade_fade_in_total
;
868 fade_in_delay
= global_settings
.crossfade_fade_in_delay
* BYTERATE
;
870 /* Find the right chunk and sample to start fading in */
871 fade_in_delay
+= crossfade_sample
* 2;
872 crossfade_sample
= find_chunk(fade_in_delay
, &crossfade_chunk
) / 2;
873 logf("crossfade_start done!");
876 /* Perform fade-in of new track */
877 static void write_to_crossfade(size_t length
)
882 if (crossfade_fade_in_rem
)
887 /* Fade factor for this packet */
889 ((crossfade_fade_in_total
- crossfade_fade_in_rem
) << 8) /
890 crossfade_fade_in_total
;
892 size_t fade_rem
= MIN(length
, crossfade_fade_in_rem
);
894 /* We _will_ fade this many bytes */
895 crossfade_fade_in_rem
-= fade_rem
;
900 size_t fade_total
= fade_rem
;
901 fade_rem
= crossfade_mix_fade(factor
, fade_rem
, buf
,
902 &crossfade_sample
, &crossfade_chunk
);
903 length
-= fade_total
- fade_rem
;
904 buf
+= fade_total
- fade_rem
;
909 samples
= fade_rem
/ 2;
910 input_buf
= (int16_t *)buf
;
911 /* Fade remaining samples in place */
914 int32_t sample
= *input_buf
;
915 *input_buf
++ = (sample
* factor
) >> 8;
922 size_t mix_total
= length
;
923 /* A factor of 256 means mix only, no fading */
924 length
= crossfade_mix_fade(256, length
, buf
,
925 &crossfade_sample
, &crossfade_chunk
);
926 buf
+= mix_total
- length
;
931 /* Commit samples to the buffer */
932 while (!prepare_insert(length
))
937 size_t pcmbuffer_index
= pcmbuffer_pos
+ pcmbuffer_fillpos
;
938 size_t copy_n
= MIN(length
, pcmbuf_size
- pcmbuffer_index
);
939 memcpy(&pcmbuffer
[pcmbuffer_index
], buf
, copy_n
);
941 pcmbuffer_fillpos
+= copy_n
;
945 /* if no more fading-in to do, stop the crossfade */
946 if (!(crossfade_fade_in_rem
|| crossfade_chunk
))
947 crossfade_active
= false;
950 static void pcmbuf_finish_crossfade_enable(void)
952 /* Copy the pending setting over now */
953 crossfade_enabled
= crossfade_enable_request
;
955 pcmbuf_watermark
= (crossfade_enabled
&& pcmbuf_size
) ?
956 /* If crossfading, try to keep the buffer full other than 1 second */
957 (pcmbuf_size
- BYTERATE
) :
958 /* Otherwise, just use the default */
962 bool pcmbuf_is_crossfade_active(void)
964 return crossfade_active
|| crossfade_track_change_started
;
967 void pcmbuf_request_crossfade_enable(bool on_off
)
969 /* Next setting to be used, not applied now */
970 crossfade_enable_request
= on_off
;
973 bool pcmbuf_is_same_size(void)
975 /* if pcmbuffer is NULL, then not set up yet even once so always */
976 bool same_size
= pcmbuffer
?
977 (get_next_required_pcmbuf_size() == pcmbuf_size
) : true;
979 /* no buffer change needed, so finish crossfade setup now */
981 pcmbuf_finish_crossfade_enable();
985 #endif /* HAVE_CROSSFADE */
990 /* Returns pcm buffer usage in percents (0 to 100). */
991 static int pcmbuf_usage(void)
993 return pcmbuf_unplayed_bytes
* 100 / pcmbuf_size
;
996 static int pcmbuf_mix_free(void)
1001 (size_t)&((int16_t *)mix_chunk
->addr
)[pcmbuf_mix_sample
];
1002 size_t my_write_pos
= (size_t)&pcmbuffer
[pcmbuffer_pos
];
1003 if (my_write_pos
< my_mix_end
)
1004 my_write_pos
+= pcmbuf_size
;
1005 return (my_write_pos
- my_mix_end
) * 100 / pcmbuf_unplayed_bytes
;
1010 void *pcmbuf_request_voice_buffer(int *count
)
1012 /* A get-it-to-work-for-now hack (audio status could change by
1014 if (audio_status() & AUDIO_STATUS_PLAY
)
1016 if (read_chunk
== NULL
)
1020 else if (pcmbuf_usage() >= 10 && pcmbuf_mix_free() >= 30 &&
1021 (mix_chunk
|| read_chunk
->link
))
1023 *count
= MIN(*count
, AUX_BUFSIZE
/4);
1033 return pcmbuf_request_buffer(count
);
1037 void pcmbuf_write_voice_complete(int count
)
1039 /* A get-it-to-work-for-now hack (audio status could have changed) */
1040 if (!(audio_status() & AUDIO_STATUS_PLAY
))
1042 pcmbuf_write_complete(count
);
1046 int16_t *ibuf
= (int16_t *)voicebuf
;
1048 size_t chunk_samples
;
1050 if (mix_chunk
== NULL
&& read_chunk
!= NULL
)
1052 mix_chunk
= read_chunk
->link
;
1053 /* Start 1/8s into the next chunk */
1054 pcmbuf_mix_sample
= BYTERATE
/ 16;
1060 obuf
= (int16_t *)mix_chunk
->addr
;
1061 chunk_samples
= mix_chunk
->size
/ sizeof (int16_t);
1067 int32_t sample
= *ibuf
++;
1069 if (pcmbuf_mix_sample
>= chunk_samples
)
1071 mix_chunk
= mix_chunk
->link
;
1074 pcmbuf_mix_sample
= 0;
1075 obuf
= (int16_t *)mix_chunk
->addr
;
1076 chunk_samples
= mix_chunk
->size
/ 2;
1078 sample
+= obuf
[pcmbuf_mix_sample
] >> 2;
1079 obuf
[pcmbuf_mix_sample
++] = clip_sample_16(sample
);
1084 /** Debug menu, other metrics */
1086 /* Amount of bytes left in the buffer. */
1087 size_t pcmbuf_free(void)
1089 if (read_chunk
!= NULL
)
1091 void *read
= (void *)read_chunk
->addr
;
1092 void *write
= &pcmbuffer
[pcmbuffer_pos
+ pcmbuffer_fillpos
];
1094 return (size_t)(read
- write
) + pcmbuf_size
;
1096 return (size_t) (read
- write
);
1098 return pcmbuf_size
- pcmbuffer_fillpos
;
1101 size_t pcmbuf_get_bufsize(void)
1106 int pcmbuf_used_descs(void)
1108 struct chunkdesc
*temp
= read_chunk
;
1117 int pcmbuf_descs(void)
1119 return NUM_CHUNK_DESCS(pcmbuf_size
);
1122 #ifdef ROCKBOX_HAS_LOGF
1123 unsigned char *pcmbuf_get_meminfo(size_t *length
)
1125 *length
= pcmbuf_bufend
- pcmbuffer
;
1133 bool pcmbuf_is_lowdata(void)
1135 if (!pcm_is_playing() || pcm_is_paused()
1136 #ifdef HAVE_CROSSFADE
1137 || pcmbuf_is_crossfade_active()
1143 /* 1 seconds of buffer is low data */
1146 /* under watermark is low data */
1147 return (pcmbuf_unplayed_bytes
< pcmbuf_watermark
);
1151 void pcmbuf_set_low_latency(bool state
)
1153 low_latency_mode
= state
;
1156 unsigned long pcmbuf_get_latency(void)
1158 return (pcmbuf_unplayed_bytes
+ pcm_get_bytes_waiting()) * 1000 / BYTERATE
;
1161 #ifndef HAVE_HARDWARE_BEEP
1162 #define MINIBUF_SAMPLES (NATIVE_FREQUENCY / 1000 * KEYCLICK_DURATION)
1163 #define MINIBUF_SIZE (MINIBUF_SAMPLES*4)
1165 /* Generates a constant square wave sound with a given frequency
1166 in Hertz for a duration in milliseconds. */
1167 void pcmbuf_beep(unsigned int frequency
, size_t duration
, int amplitude
)
1169 unsigned int step
= 0xffffffffu
/ NATIVE_FREQUENCY
* frequency
;
1171 int16_t *bufptr
, *bufstart
, *bufend
;
1173 int nsamples
= NATIVE_FREQUENCY
/ 1000 * duration
;
1174 bool mix
= read_chunk
!= NULL
&& read_chunk
->link
!= NULL
;
1177 bufend
= SKIPBYTES((int16_t *)pcmbuffer
, pcmbuf_size
);
1179 /* Find the insertion point and set bufstart to the start of it */
1182 /* Get the currently playing chunk at the current position. */
1183 bufstart
= (int16_t *)pcm_play_dma_get_peak_buffer(&i
);
1185 /* If above isn't implemented or pcm is stopped, no beepeth. */
1186 if (!bufstart
|| !pcm_is_playing())
1189 /* Give 5ms clearance. */
1190 bufstart
+= BYTERATE
/ 200;
1192 #ifdef HAVE_PCM_DMA_ADDRESS
1193 /* Returned peak addresses are DMA addresses */
1194 bufend
= pcm_dma_addr(bufend
);
1197 /* Wrapped above? */
1198 if (bufstart
>= bufend
)
1199 bufstart
-= pcmbuf_size
;
1201 /* NOTE: On some targets using hardware DMA, cache range flushing may
1202 * be required or the writes may not be picked up by the controller.
1203 * An incremental flush should be done periodically during the mixdown. */
1205 else if (nsamples
<= MINIBUF_SAMPLES
)
1207 static int16_t minibuf
[MINIBUF_SAMPLES
*2] __attribute__((aligned(4)));
1208 /* Use mini buffer */
1210 bufend
= SKIPBYTES(bufstart
, MINIBUF_SIZE
);
1212 else if (!audio_buffer_state_trashed())
1215 bufstart
= (int16_t *)pcmbuffer
;
1225 /* Mix square wave into buffer */
1226 for (i
= 0; i
< nsamples
; ++i
)
1228 int32_t amp
= (phase
>> 31) ^ (int32_t)amplitude
;
1229 sample
= mix
? *bufptr
: 0;
1230 *bufptr
++ = clip_sample_16(sample
+ amp
);
1231 if (bufptr
>= bufend
)
1232 bufptr
= (int16_t *)pcmbuffer
;
1233 sample
= mix
? *bufptr
: 0;
1234 *bufptr
++ = clip_sample_16(sample
+ amp
);
1235 if (bufptr
>= bufend
)
1236 bufptr
= (int16_t *)pcmbuffer
;
1242 #ifdef HAVE_RECORDING
1246 /* Kick off playback if required and it won't interfere */
1247 if (!pcm_is_playing()
1248 #ifdef HAVE_RECORDING
1249 && !pcm_is_recording()
1253 pcm_play_data(NULL
, (unsigned char *)bufstart
, nsamples
* 4);
1257 #ifdef HAVE_RECORDING
1261 #endif /* HAVE_HARDWARE_BEEP */