1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (C) 2005 Dave Chapman
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 ****************************************************************************/
23 #include <codecs/libmad/mad.h>
28 #if NUM_CORES > 1 && !defined(MPEGPLAYER)
29 #define MPA_SYNTH_ON_COP
32 static struct mad_stream stream IBSS_ATTR
;
33 static struct mad_frame frame IBSS_ATTR
;
34 static struct mad_synth synth IBSS_ATTR
;
36 #ifdef MPA_SYNTH_ON_COP
37 static volatile short die IBSS_ATTR
= 0; /*thread should die*/
39 #if (CONFIG_CPU == PP5024) || (CONFIG_CPU == PP5022)
40 static mad_fixed_t sbsample_prev
[2][36][32] IBSS_ATTR
;
42 static mad_fixed_t sbsample_prev
[2][36][32] SHAREDBSS_ATTR
;
45 static struct semaphore synth_done_sem IBSS_ATTR
;
46 static struct semaphore synth_pending_sem IBSS_ATTR
;
49 #define INPUT_CHUNK_SIZE 8192
51 static mad_fixed_t mad_frame_overlap
[2][32][18] IBSS_ATTR
;
52 static mad_fixed_t sbsample
[2][36][32] IBSS_ATTR
;
54 static unsigned char mad_main_data
[MAD_BUFFER_MDLEN
] IBSS_ATTR
;
55 /* TODO: what latency does layer 1 have? */
56 static int mpeg_latency
[3] = { 0, 481, 529 };
57 static int mpeg_framesize
[3] = {384, 1152, 1152};
59 static void init_mad(void)
61 ci
->memset(&stream
, 0, sizeof(struct mad_stream
));
62 ci
->memset(&frame
, 0, sizeof(struct mad_frame
));
63 ci
->memset(&synth
, 0, sizeof(struct mad_synth
));
65 #ifdef MPA_SYNTH_ON_COP
66 frame
.sbsample_prev
= &sbsample_prev
;
67 frame
.sbsample
= &sbsample
;
69 frame
.sbsample_prev
= &sbsample
;
70 frame
.sbsample
= &sbsample
;
73 /* We do this so libmad doesn't try to call codec_calloc(). This needs to
74 * be called before mad_stream_init(), mad_frame_inti() and
75 * mad_synth_init(). */
76 frame
.overlap
= &mad_frame_overlap
;
77 stream
.main_data
= &mad_main_data
;
79 /* Call mad initialization. Those will zero the arrays frame.overlap,
80 * frame.sbsample and frame.sbsample_prev. Therefore there is no need to
82 mad_stream_init(&stream
);
83 mad_frame_init(&frame
);
84 mad_synth_init(&synth
);
87 static int get_file_pos(int newtime
)
90 struct mp3entry
*id3
= ci
->id3
;
93 /* Convert newtime and id3->length to seconds to
95 unsigned int newtime_s
= newtime
/1000;
96 unsigned int length_s
= id3
->length
/1000;
99 /* Use the TOC to find the new position */
100 unsigned int percent
, remainder
;
101 int curtoc
, nexttoc
, plen
;
103 percent
= (newtime_s
*100) / length_s
;
107 curtoc
= id3
->toc
[percent
];
110 nexttoc
= id3
->toc
[percent
+1];
115 pos
= (id3
->filesize
/256)*curtoc
;
117 /* Use the remainder to get a more accurate position */
118 remainder
= (newtime_s
*100) % length_s
;
119 remainder
= (remainder
*100) / length_s
;
120 plen
= (nexttoc
- curtoc
)*(id3
->filesize
/256);
121 pos
+= (plen
/100)*remainder
;
123 /* No TOC exists, estimate the new position */
124 pos
= (id3
->filesize
/ length_s
) * newtime_s
;
126 } else if (id3
->bitrate
) {
127 pos
= newtime
* (id3
->bitrate
/ 8);
132 /* Don't seek right to the end of the file so that we can
133 transition properly to the next song */
134 if (pos
>= (int)(id3
->filesize
- id3
->id3v1len
))
135 pos
= id3
->filesize
- id3
->id3v1len
- 1;
137 /* id3->filesize excludes id3->first_frame_offset, so add it now */
138 pos
+= id3
->first_frame_offset
;
143 static void set_elapsed(struct mp3entry
* id3
)
145 unsigned long offset
= id3
->offset
> id3
->first_frame_offset
?
146 id3
->offset
- id3
->first_frame_offset
: 0;
147 unsigned long elapsed
= id3
->elapsed
;
150 if ( id3
->has_toc
) {
151 /* calculate elapsed time using TOC */
153 unsigned int remainder
, plen
, relpos
, nextpos
;
155 /* find wich percent we're at */
156 for (i
=0; i
<100; i
++ )
157 if ( offset
< id3
->toc
[i
] * (id3
->filesize
/ 256) )
164 relpos
= id3
->toc
[i
];
167 nextpos
= id3
->toc
[i
+1];
171 remainder
= offset
- (relpos
* (id3
->filesize
/ 256));
173 /* set time for this percent (divide before multiply to prevent
174 overflow on long files. loss of precision is negligible on
176 elapsed
= i
* (id3
->length
/ 100);
178 /* calculate remainder time */
179 plen
= (nextpos
- relpos
) * (id3
->filesize
/ 256);
180 elapsed
+= (((remainder
* 100) / plen
) * (id3
->length
/ 10000));
183 /* no TOC exists. set a rough estimate using average bitrate */
184 int tpk
= id3
->length
/
185 ((id3
->filesize
- id3
->first_frame_offset
- id3
->id3v1len
) /
187 elapsed
= offset
/ 1024 * tpk
;
192 /* constant bitrate, use exact calculation */
193 if (id3
->bitrate
!= 0)
194 elapsed
= offset
/ (id3
->bitrate
/ 8);
197 ci
->set_elapsed(elapsed
);
200 #ifdef MPA_SYNTH_ON_COP
203 * Run the synthesis filter on the COProcessor
206 static int mad_synth_thread_stack
[DEFAULT_STACK_SIZE
/sizeof(int)] IBSS_ATTR
;
208 static const unsigned char * const mad_synth_thread_name
= "mp3dec";
209 static unsigned int mad_synth_thread_id
= 0;
212 static void mad_synth_thread(void)
215 ci
->semaphore_release(&synth_done_sem
);
216 ci
->semaphore_wait(&synth_pending_sem
, TIMEOUT_BLOCK
);
221 mad_synth_frame(&synth
, &frame
);
225 /* wait for the synth thread to go idle which indicates a PCM frame has been
227 static inline void mad_synth_thread_wait_pcm(void)
229 ci
->semaphore_wait(&synth_done_sem
, TIMEOUT_BLOCK
);
232 /* increment the done semaphore - used after a wait for idle to preserve the
234 static inline void mad_synth_thread_unwait_pcm(void)
236 ci
->semaphore_release(&synth_done_sem
);
239 /* after synth thread has gone idle - switch decoded frames and commence
241 static void mad_synth_thread_ready(void)
243 mad_fixed_t (*temp
)[2][36][32];
245 /*circular buffer that holds 2 frames' samples*/
247 frame
.sbsample
= frame
.sbsample_prev
;
248 frame
.sbsample_prev
=temp
;
250 ci
->semaphore_release(&synth_pending_sem
);
253 static bool mad_synth_thread_create(void)
255 ci
->semaphore_init(&synth_done_sem
, 1, 0);
256 ci
->semaphore_init(&synth_pending_sem
, 1, 0);
258 mad_synth_thread_id
= ci
->create_thread(mad_synth_thread
,
259 mad_synth_thread_stack
,
260 sizeof(mad_synth_thread_stack
), 0,
261 mad_synth_thread_name
262 IF_PRIO(, PRIORITY_PLAYBACK
)
265 if (mad_synth_thread_id
== 0)
271 static void mad_synth_thread_quit(void)
273 /* mop up COP thread */
275 ci
->semaphore_release(&synth_pending_sem
);
276 ci
->thread_wait(mad_synth_thread_id
);
277 ci
->commit_discard_dcache();
280 static inline void mad_synth_thread_ready(void)
282 mad_synth_frame(&synth
, &frame
);
285 static inline bool mad_synth_thread_create(void)
290 static inline void mad_synth_thread_quit(void)
294 static inline void mad_synth_thread_wait_pcm(void)
298 static inline void mad_synth_thread_unwait_pcm(void)
301 #endif /* MPA_SYNTH_ON_COP */
303 /* this is the codec entry point */
304 enum codec_status
codec_main(enum codec_entry_call_reason reason
)
306 if (reason
== CODEC_LOAD
) {
307 /* Create a decoder instance */
311 ci
->configure(DSP_SET_SAMPLE_DEPTH
, MAD_F_FRACBITS
);
313 /* does nothing on 1 processor systems except return true */
314 if(!mad_synth_thread_create())
317 else if (reason
== CODEC_UNLOAD
) {
318 /* mop up COP thread - MT only */
319 mad_synth_thread_quit();
325 /* this is called for each file to process */
326 enum codec_status
codec_run(void)
330 int samples_to_skip
; /* samples to skip in total for this file (at start) */
333 int stop_skip
, start_skip
;
334 int current_stereo_mode
= -1;
335 unsigned long current_frequency
= 0;
337 int padding
= MAD_BUFFER_GUARD
; /* to help mad decode the last frame */
340 /* Reinitializing seems to be necessary to avoid playback quircks when seeking. */
345 ci
->configure(DSP_SWITCH_FREQUENCY
, ci
->id3
->frequency
);
346 current_frequency
= ci
->id3
->frequency
;
347 codec_set_replaygain(ci
->id3
);
349 if (ci
->id3
->offset
) {
350 ci
->seek_buffer(ci
->id3
->offset
);
351 set_elapsed(ci
->id3
);
354 ci
->seek_buffer(ci
->id3
->first_frame_offset
);
356 if (ci
->id3
->lead_trim
>= 0 && ci
->id3
->tail_trim
>= 0) {
357 stop_skip
= ci
->id3
->tail_trim
- mpeg_latency
[ci
->id3
->layer
];
358 if (stop_skip
< 0) stop_skip
= 0;
359 start_skip
= ci
->id3
->lead_trim
+ mpeg_latency
[ci
->id3
->layer
];
362 /* We want to skip this amount anyway */
363 start_skip
= mpeg_latency
[ci
->id3
->layer
];
366 /* Libmad will not decode the last frame without 8 bytes of extra padding
367 in the buffer. So, we can trick libmad into not decoding the last frame
368 if we are to skip it entirely and then cut the appropriate samples from
369 final frame that we did decode. Note, if all tags (ID3, APE) are not
370 properly stripped from the end of the file, this trick will not work. */
371 if (stop_skip
>= mpeg_framesize
[ci
->id3
->layer
]) {
373 stop_skip
-= mpeg_framesize
[ci
->id3
->layer
];
375 padding
= MAD_BUFFER_GUARD
;
378 samplesdone
= ((int64_t)ci
->id3
->elapsed
) * current_frequency
/ 1000;
380 /* Don't skip any samples unless we start at the beginning. */
384 samples_to_skip
= start_skip
;
388 /* This is the decoding loop. */
390 enum codec_command_action action
= ci
->get_command(¶m
);
392 if (action
== CODEC_ACTION_HALT
)
395 if (action
== CODEC_ACTION_SEEK_TIME
) {
398 /*make sure the synth thread is idle before seeking - MT only*/
399 mad_synth_thread_wait_pcm();
400 mad_synth_thread_unwait_pcm();
402 samplesdone
= ((int64_t)param
)*current_frequency
/1000;
405 newpos
= ci
->id3
->first_frame_offset
;
406 samples_to_skip
= start_skip
;
408 newpos
= get_file_pos(param
);
412 if (!ci
->seek_buffer(newpos
))
418 ci
->set_elapsed((samplesdone
* 1000) / current_frequency
);
425 if (stream
.error
== 0) {
426 inputbuffer
= ci
->request_buffer(&size
, INPUT_CHUNK_SIZE
);
427 if (size
== 0 || inputbuffer
== NULL
)
429 mad_stream_buffer(&stream
, (unsigned char *)inputbuffer
,
433 if (mad_frame_decode(&frame
, &stream
)) {
434 if (stream
.error
== MAD_ERROR_BUFLEN
) {
435 /* This makes the codec support partially corrupted files */
439 /* Fill the buffer */
440 if (stream
.next_frame
)
441 ci
->advance_buffer(stream
.next_frame
- stream
.buffer
);
443 ci
->advance_buffer(size
);
444 stream
.error
= 0; /* Must get new inputbuffer next time */
447 } else if (MAD_RECOVERABLE(stream
.error
)) {
448 /* Probably syncing after a seek */
451 /* Some other unrecoverable error */
456 /* Do the pcmbuf insert here. Note, this is the PREVIOUS frame's pcm
457 data (not the one just decoded above). When we exit the decoding
458 loop we will need to process the final frame that was decoded. */
459 mad_synth_thread_wait_pcm();
461 if (framelength
> 0) {
463 /* In case of a mono file, the second array will be ignored. */
464 ci
->pcmbuf_insert(&synth
.pcm
.samples
[0][samples_to_skip
],
465 &synth
.pcm
.samples
[1][samples_to_skip
],
468 /* Only skip samples for the first frame added. */
472 /* Initiate PCM synthesis on the COP (MT) or perform it here (ST) */
473 mad_synth_thread_ready();
475 /* Check if sample rate and stereo settings changed in this frame. */
476 if (frame
.header
.samplerate
!= current_frequency
) {
477 current_frequency
= frame
.header
.samplerate
;
478 ci
->configure(DSP_SWITCH_FREQUENCY
, current_frequency
);
480 if (MAD_NCHANNELS(&frame
.header
) == 2) {
481 if (current_stereo_mode
!= STEREO_NONINTERLEAVED
) {
482 ci
->configure(DSP_SET_STEREO_MODE
, STEREO_NONINTERLEAVED
);
483 current_stereo_mode
= STEREO_NONINTERLEAVED
;
486 if (current_stereo_mode
!= STEREO_MONO
) {
487 ci
->configure(DSP_SET_STEREO_MODE
, STEREO_MONO
);
488 current_stereo_mode
= STEREO_MONO
;
492 if (stream
.next_frame
)
493 ci
->advance_buffer(stream
.next_frame
- stream
.buffer
);
495 ci
->advance_buffer(size
);
496 stream
.error
= 0; /* Must get new inputbuffer next time */
499 framelength
= synth
.pcm
.length
- samples_to_skip
;
500 if (framelength
< 0) {
502 samples_to_skip
-= synth
.pcm
.length
;
505 samplesdone
+= framelength
;
506 ci
->set_elapsed((samplesdone
* 1000) / current_frequency
);
509 /* wait for synth idle - MT only*/
510 mad_synth_thread_wait_pcm();
511 mad_synth_thread_unwait_pcm();
513 /* Finish the remaining decoded frame.
514 Cut the required samples from the end. */
515 if (framelength
> stop_skip
){
516 ci
->pcmbuf_insert(synth
.pcm
.samples
[0], synth
.pcm
.samples
[1],
517 framelength
- stop_skip
);