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Win32: add a new build-script helper
[vlc.git] / modules / audio_filter / scaletempo.c
blob26f57f00965192665fb5434265b4142419ad89dc
1 /*****************************************************************************
2 * scaletempo.c: Scale audio tempo while maintaining pitch
3 *****************************************************************************
4 * Copyright © 2008 VLC authors and VideoLAN
5 * $Id$
6 *
7 * Authors: Rov Juvano <rovjuvano@users.sourceforge.net>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
23
24 /*****************************************************************************
25 * Preamble
26 *****************************************************************************/
27 #ifdef HAVE_CONFIG_H
28 # include "config.h"
29 #endif
30
31 #include <vlc_common.h>
32 #include <vlc_plugin.h>
33 #include <vlc_aout.h>
34 #include <vlc_filter.h>
35 #include <vlc_modules.h>
36 #include <vlc_atomic.h>
37
38 #include <string.h> /* for memset */
39 #include <limits.h> /* form INT_MIN */
40
41 /*****************************************************************************
42 * Module descriptor
43 *****************************************************************************/
44 static int Open( vlc_object_t * );
45 static void Close( vlc_object_t * );
46 static block_t *DoWork( filter_t *, block_t * );
47
48 #ifdef PITCH_SHIFTER
49 static int OpenPitch( vlc_object_t * );
50 static void ClosePitch( vlc_object_t * );
51 static block_t *DoPitchWork( filter_t *, block_t * );
52 # define MODULE_DESC N_("Pitch Shifter")
53 # define MODULES_SHORTNAME N_("Audio pitch changer")
54 #else
55 # define MODULE_DESC N_("Audio tempo scaler synched with rate")
56 # define MODULES_SHORTNAME N_("Scaletempo")
57 #endif
58
59 vlc_module_begin ()
60 set_description( MODULE_DESC )
61 set_shortname( MODULES_SHORTNAME )
62 set_capability( "audio filter", 0 )
63 set_category( CAT_AUDIO )
64 set_subcategory( SUBCAT_AUDIO_AFILTER )
65
66 add_integer_with_range( "scaletempo-stride", 30, 1, 2000,
67 N_("Stride Length"), N_("Length in milliseconds to output each stride"), true )
68 add_float_with_range( "scaletempo-overlap", .20, 0.0, 1.0,
69 N_("Overlap Length"), N_("Percentage of stride to overlap"), true )
70 add_integer_with_range( "scaletempo-search", 14, 0, 200,
71 N_("Search Length"), N_("Length in milliseconds to search for best overlap position"), true )
72 #ifdef PITCH_SHIFTER
73 add_float_with_range( "pitch-shift", 0, -12, 12,
74 N_("Pitch Shift"), N_("Pitch shift in semitones"), false )
75 set_callbacks( OpenPitch, ClosePitch )
76 #else
77 set_callbacks( Open, Close )
78 #endif
79
80 vlc_module_end ()
81
82 /*
83 * Scaletempo works by producing audio in constant sized chunks (a "stride") but
84 * consuming chunks proportional to the playback rate.
85 *
86 * Scaletempo then smooths the output by blending the end of one stride with
87 * the next ("overlap").
88 *
89 * Scaletempo smooths the overlap further by searching within the input buffer
90 * for the best overlap position. Scaletempo uses a statistical cross correlation
91 * (roughly a dot-product). Scaletempo consumes most of its CPU cycles here.
92 *
93 * NOTE:
94 * sample: a single audio sample for one channel
95 * frame: a single set of samples, one for each channel
96 * VLC uses these terms differently
97 */
98 struct filter_sys_t
99 {
100 /* Filter static config */
101 double scale;
102 /* parameters */
103 unsigned ms_stride;
104 double percent_overlap;
105 unsigned ms_search;
106 /* audio format */
107 unsigned samples_per_frame; /* AKA number of channels */
108 unsigned bytes_per_sample;
109 unsigned bytes_per_frame;
110 unsigned sample_rate;
111 /* stride */
112 double frames_stride_scaled;
113 double frames_stride_error;
114 unsigned bytes_stride;
115 double bytes_stride_scaled;
116 unsigned bytes_queue_max;
117 unsigned bytes_queued;
118 unsigned bytes_to_slide;
119 uint8_t *buf_queue;
120 /* overlap */
121 unsigned samples_overlap;
122 unsigned samples_standing;
123 unsigned bytes_overlap;
124 unsigned bytes_standing;
125 void *buf_overlap;
126 void *table_blend;
127 void (*output_overlap)( filter_t *p_filter, void *p_out_buf, unsigned bytes_off );
128 /* best overlap */
129 unsigned frames_search;
130 void *buf_pre_corr;
131 void *table_window;
132 unsigned(*best_overlap_offset)( filter_t *p_filter );
133 #ifdef PITCH_SHIFTER
134 /* pitch */
135 filter_t * resampler;
136 vlc_atomic_float rate_shift;
137 #endif
138 };
139
140 /*****************************************************************************
141 * best_overlap_offset: calculate best offset for overlap
142 *****************************************************************************/
143 static unsigned best_overlap_offset_float( filter_t *p_filter )
144 {
145 filter_sys_t *p = p_filter->p_sys;
146 float *pw, *po, *ppc, *search_start;
147 float best_corr = INT_MIN;
148 unsigned best_off = 0;
149 unsigned i, off;
150
151 pw = p->table_window;
152 po = p->buf_overlap;
153 po += p->samples_per_frame;
154 ppc = p->buf_pre_corr;
155 for( i = p->samples_per_frame; i < p->samples_overlap; i++ ) {
156 *ppc++ = *pw++ * *po++;
157 }
158
159 search_start = (float *)p->buf_queue + p->samples_per_frame;
160 for( off = 0; off < p->frames_search; off++ ) {
161 float corr = 0;
162 float *ps = search_start;
163 ppc = p->buf_pre_corr;
164 for( i = p->samples_per_frame; i < p->samples_overlap; i++ ) {
165 corr += *ppc++ * *ps++;
166 }
167 if( corr > best_corr ) {
168 best_corr = corr;
169 best_off = off;
170 }
171 search_start += p->samples_per_frame;
172 }
173
174 return best_off * p->bytes_per_frame;
175 }
176
177 /*****************************************************************************
178 * output_overlap: blend end of previous stride with beginning of current stride
179 *****************************************************************************/
180 static void output_overlap_float( filter_t *p_filter,
181 void *buf_out,
182 unsigned bytes_off )
183 {
184 filter_sys_t *p = p_filter->p_sys;
185 float *pout = buf_out;
186 float *pb = p->table_blend;
187 float *po = p->buf_overlap;
188 float *pin = (float *)( p->buf_queue + bytes_off );
189 unsigned i;
190 for( i = 0; i < p->samples_overlap; i++ ) {
191 *pout++ = *po - *pb++ * ( *po - *pin++ ); po++;
192 }
193 }
194
195 /*****************************************************************************
196 * fill_queue: fill p_sys->buf_queue as much possible, skipping samples as needed
197 *****************************************************************************/
198 static size_t fill_queue( filter_t *p_filter,
199 uint8_t *p_buffer,
200 size_t i_buffer,
201 size_t offset )
202 {
203 filter_sys_t *p = p_filter->p_sys;
204 unsigned bytes_in = i_buffer - offset;
205 size_t offset_unchanged = offset;
206
207 if( p->bytes_to_slide > 0 ) {
208 if( p->bytes_to_slide < p->bytes_queued ) {
209 unsigned bytes_in_move = p->bytes_queued - p->bytes_to_slide;
210 memmove( p->buf_queue,
211 p->buf_queue + p->bytes_to_slide,
212 bytes_in_move );
213 p->bytes_to_slide = 0;
214 p->bytes_queued = bytes_in_move;
215 } else {
216 unsigned bytes_in_skip;
217 p->bytes_to_slide -= p->bytes_queued;
218 bytes_in_skip = __MIN( p->bytes_to_slide, bytes_in );
219 p->bytes_queued = 0;
220 p->bytes_to_slide -= bytes_in_skip;
221 offset += bytes_in_skip;
222 bytes_in -= bytes_in_skip;
223 }
224 }
225
226 if( bytes_in > 0 ) {
227 unsigned bytes_in_copy = __MIN( p->bytes_queue_max - p->bytes_queued, bytes_in );
228 memcpy( p->buf_queue + p->bytes_queued,
229 p_buffer + offset,
230 bytes_in_copy );
231 p->bytes_queued += bytes_in_copy;
232 offset += bytes_in_copy;
233 }
234
235 return offset - offset_unchanged;
236 }
237
238 /*****************************************************************************
239 * transform_buffer: main filter loop
240 *****************************************************************************/
241 static size_t transform_buffer( filter_t *p_filter,
242 uint8_t *p_buffer,
243 size_t i_buffer,
244 uint8_t *pout )
245 {
246 filter_sys_t *p = p_filter->p_sys;
247
248 size_t offset_in = fill_queue( p_filter, p_buffer, i_buffer, 0 );
249 unsigned bytes_out = 0;
250 while( p->bytes_queued >= p->bytes_queue_max ) {
251 unsigned bytes_off = 0;
252
253 // output stride
254 if( p->output_overlap ) {
255 if( p->best_overlap_offset ) {
256 bytes_off = p->best_overlap_offset( p_filter );
257 }
258 p->output_overlap( p_filter, pout, bytes_off );
259 }
260 memcpy( pout + p->bytes_overlap,
261 p->buf_queue + bytes_off + p->bytes_overlap,
262 p->bytes_standing );
263 pout += p->bytes_stride;
264 bytes_out += p->bytes_stride;
265
266 // input stride
267 memcpy( p->buf_overlap,
268 p->buf_queue + bytes_off + p->bytes_stride,
269 p->bytes_overlap );
270 double frames_to_slide = p->frames_stride_scaled + p->frames_stride_error;
271 unsigned frames_to_stride_whole = (int)frames_to_slide;
272 p->bytes_to_slide = frames_to_stride_whole * p->bytes_per_frame;
273 p->frames_stride_error = frames_to_slide - frames_to_stride_whole;
274
275 offset_in += fill_queue( p_filter, p_buffer, i_buffer, offset_in );
276 }
277
278 return bytes_out;
279 }
280
281 /*****************************************************************************
282 * calculate_output_buffer_size
283 *****************************************************************************/
284 static size_t calculate_output_buffer_size( filter_t *p_filter,
285 size_t bytes_in )
286 {
287 filter_sys_t *p = p_filter->p_sys;
288 size_t bytes_out = 0;
289 int bytes_to_out = bytes_in + p->bytes_queued - p->bytes_to_slide;
290 if( bytes_to_out >= (int)p->bytes_queue_max ) {
291 /* while (total_buffered - stride_length * n >= queue_max) n++ */
292 bytes_out = p->bytes_stride * ( (unsigned)(
293 ( bytes_to_out - p->bytes_queue_max + /* rounding protection */ p->bytes_per_frame )
294 / p->bytes_stride_scaled ) + 1 );
295 }
296 return bytes_out;
297 }
298
299 /*****************************************************************************
300 * reinit_buffers: reinitializes buffers in p_filter->p_sys
301 *****************************************************************************/
302 static int reinit_buffers( filter_t *p_filter )
303 {
304 filter_sys_t *p = p_filter->p_sys;
305 unsigned i,j;
306
307 unsigned frames_stride = p->ms_stride * p->sample_rate / 1000.0;
308 p->bytes_stride = frames_stride * p->bytes_per_frame;
309
310 /* overlap */
311 unsigned frames_overlap = frames_stride * p->percent_overlap;
312 if( frames_overlap < 1 )
313 { /* if no overlap */
314 p->bytes_overlap = 0;
315 p->bytes_standing = p->bytes_stride;
316 p->samples_standing = p->bytes_standing / p->bytes_per_sample;
317 p->output_overlap = NULL;
318 }
319 else
320 {
321 unsigned prev_overlap = p->bytes_overlap;
322 p->bytes_overlap = frames_overlap * p->bytes_per_frame;
323 p->samples_overlap = frames_overlap * p->samples_per_frame;
324 p->bytes_standing = p->bytes_stride - p->bytes_overlap;
325 p->samples_standing = p->bytes_standing / p->bytes_per_sample;
326 p->buf_overlap = vlc_alloc( 1, p->bytes_overlap );
327 p->table_blend = vlc_alloc( 4, p->samples_overlap ); /* sizeof (int32|float) */
328 if( !p->buf_overlap || !p->table_blend )
329 return VLC_ENOMEM;
330 if( p->bytes_overlap > prev_overlap )
331 memset( (uint8_t *)p->buf_overlap + prev_overlap, 0, p->bytes_overlap - prev_overlap );
332
333 float *pb = p->table_blend;
334 float t = (float)frames_overlap;
335 for( i = 0; i<frames_overlap; i++ )
336 {
337 float v = i / t;
338 for( j = 0; j < p->samples_per_frame; j++ )
339 *pb++ = v;
340 }
341 p->output_overlap = output_overlap_float;
342 }
343
344 /* best overlap */
345 p->frames_search = ( frames_overlap <= 1 ) ? 0 : p->ms_search * p->sample_rate / 1000.0;
346 if( p->frames_search < 1 )
347 { /* if no search */
348 p->best_overlap_offset = NULL;
349 }
350 else
351 {
352 unsigned bytes_pre_corr = ( p->samples_overlap - p->samples_per_frame ) * 4; /* sizeof (int32|float) */
353 p->buf_pre_corr = malloc( bytes_pre_corr );
354 p->table_window = malloc( bytes_pre_corr );
355 if( ! p->buf_pre_corr || ! p->table_window )
356 return VLC_ENOMEM;
357 float *pw = p->table_window;
358 for( i = 1; i<frames_overlap; i++ )
359 {
360 float v = i * ( frames_overlap - i );
361 for( j = 0; j < p->samples_per_frame; j++ )
362 *pw++ = v;
363 }
364 p->best_overlap_offset = best_overlap_offset_float;
365 }
366
367 unsigned new_size = ( p->frames_search + frames_stride + frames_overlap ) * p->bytes_per_frame;
368 if( p->bytes_queued > new_size )
369 {
370 if( p->bytes_to_slide > p->bytes_queued )
371 {
372 p->bytes_to_slide -= p->bytes_queued;
373 p->bytes_queued = 0;
374 }
375 else
376 {
377 unsigned new_queued = __MIN( p->bytes_queued - p->bytes_to_slide, new_size );
378 memmove( p->buf_queue,
379 p->buf_queue + p->bytes_queued - new_queued,
380 new_queued );
381 p->bytes_to_slide = 0;
382 p->bytes_queued = new_queued;
383 }
384 }
385 p->bytes_queue_max = new_size;
386 p->buf_queue = malloc( p->bytes_queue_max );
387 if( ! p->buf_queue )
388 return VLC_ENOMEM;
389
390 p->bytes_stride_scaled = p->bytes_stride * p->scale;
391 p->frames_stride_scaled = p->bytes_stride_scaled / p->bytes_per_frame;
392
393 msg_Dbg( VLC_OBJECT(p_filter),
394 "%.3f scale, %.3f stride_in, %i stride_out, %i standing, %i overlap, %i search, %i queue, %s mode",
395 p->scale,
396 p->frames_stride_scaled,
397 (int)( p->bytes_stride / p->bytes_per_frame ),
398 (int)( p->bytes_standing / p->bytes_per_frame ),
399 (int)( p->bytes_overlap / p->bytes_per_frame ),
400 p->frames_search,
401 (int)( p->bytes_queue_max / p->bytes_per_frame ),
402 "fl32");
403
404 return VLC_SUCCESS;
405 }
406
407 /*****************************************************************************
408 * Open: initialize as "audio filter"
409 *****************************************************************************/
410 static int Open( vlc_object_t *p_this )
411 {
412 filter_t *p_filter = (filter_t *)p_this;
413
414 /* Allocate structure */
415 filter_sys_t *p_sys = p_filter->p_sys = malloc( sizeof(*p_sys) );
416 if( ! p_sys )
417 return VLC_ENOMEM;
418
419 p_sys->scale = 1.0;
420 p_sys->sample_rate = p_filter->fmt_in.audio.i_rate;
421 p_sys->samples_per_frame = aout_FormatNbChannels( &p_filter->fmt_in.audio );
422 p_sys->bytes_per_sample = 4;
423 p_sys->bytes_per_frame = p_sys->samples_per_frame * p_sys->bytes_per_sample;
424
425 msg_Dbg( p_this, "format: %5i rate, %i nch, %i bps, %s",
426 p_sys->sample_rate,
427 p_sys->samples_per_frame,
428 p_sys->bytes_per_sample,
429 "fl32" );
430
431 p_sys->ms_stride = var_InheritInteger( p_this, "scaletempo-stride" );
432 p_sys->percent_overlap = var_InheritFloat( p_this, "scaletempo-overlap" );
433 p_sys->ms_search = var_InheritInteger( p_this, "scaletempo-search" );
434
435 msg_Dbg( p_this, "params: %i stride, %.3f overlap, %i search",
436 p_sys->ms_stride, p_sys->percent_overlap, p_sys->ms_search );
437
438 p_sys->buf_queue = NULL;
439 p_sys->buf_overlap = NULL;
440 p_sys->table_blend = NULL;
441 p_sys->buf_pre_corr = NULL;
442 p_sys->table_window = NULL;
443 p_sys->bytes_overlap = 0;
444 p_sys->bytes_queued = 0;
445 p_sys->bytes_to_slide = 0;
446 p_sys->frames_stride_error = 0;
447
448 if( reinit_buffers( p_filter ) != VLC_SUCCESS )
449 {
450 Close( p_this );
451 return VLC_EGENERIC;
452 }
453
454 p_filter->fmt_in.audio.i_format = VLC_CODEC_FL32;
455 aout_FormatPrepare(&p_filter->fmt_in.audio);
456 p_filter->fmt_out.audio = p_filter->fmt_in.audio;
457 p_filter->pf_audio_filter = DoWork;
458
459 return VLC_SUCCESS;
460 }
461
462 #ifdef PITCH_SHIFTER
463 static inline void PitchSetRateShift( filter_sys_t *p_sys, float pitch_shift )
464 {
465 vlc_atomic_store_float( &p_sys->rate_shift,
466 p_sys->sample_rate / powf(2, pitch_shift / 12) );
467 }
468
469 static int PitchCallback( vlc_object_t *p_this, char const *psz_var,
470 vlc_value_t oldval, vlc_value_t newval, void *p_data )
471 {
472 VLC_UNUSED( p_this );
473 VLC_UNUSED( oldval );
474 VLC_UNUSED( psz_var );
475
476 PitchSetRateShift( p_data, newval.f_float );
477
478 return VLC_SUCCESS;
479 }
480
481 static filter_t *ResamplerCreate(filter_t *p_filter)
482 {
483 filter_t *p_resampler = vlc_object_create( p_filter, sizeof (filter_t) );
484 if( unlikely( p_resampler == NULL ) )
485 return NULL;
486
487 p_resampler->owner.sys = NULL;
488 p_resampler->p_cfg = NULL;
489 p_resampler->fmt_in = p_filter->fmt_in;
490 p_resampler->fmt_out = p_filter->fmt_in;
491 p_resampler->fmt_out.audio.i_rate =
492 vlc_atomic_load_float( &p_filter->p_sys->rate_shift );
493 aout_FormatPrepare( &p_resampler->fmt_out.audio );
494 p_resampler->p_module = module_need( p_resampler, "audio resampler", NULL,
495 false );
496
497 if( p_resampler->p_module == NULL )
498 {
499 msg_Err( p_filter, "Could not load resampler" );
500 vlc_object_release( p_resampler );
501 return NULL;
502 }
503 return p_resampler;
504 }
505
506 static int OpenPitch( vlc_object_t *p_this )
507 {
508 int err = Open( p_this );
509 if( err )
510 return err;
511
512 filter_t *p_filter = (filter_t *)p_this;
513 vlc_object_t *p_aout = p_filter->obj.parent;
514 filter_sys_t *p_sys = p_filter->p_sys;
515
516 float pitch_shift = var_CreateGetFloat( p_aout, "pitch-shift" );
517 var_AddCallback( p_aout, "pitch-shift", PitchCallback, p_sys );
518 PitchSetRateShift( p_sys, pitch_shift );
519
520 p_sys->resampler = ResamplerCreate(p_filter);
521 if( !p_sys->resampler )
522 return VLC_EGENERIC;
523
524 p_filter->pf_audio_filter = DoPitchWork;
525
526 return VLC_SUCCESS;
527 }
528 #endif
529
530 static void Close( vlc_object_t *p_this )
531 {
532 filter_t *p_filter = (filter_t *)p_this;
533 filter_sys_t *p_sys = p_filter->p_sys;
534 free( p_sys->buf_queue );
535 free( p_sys->buf_overlap );
536 free( p_sys->table_blend );
537 free( p_sys->buf_pre_corr );
538 free( p_sys->table_window );
539 free( p_sys );
540 }
541
542 #ifdef PITCH_SHIFTER
543 static void ClosePitch( vlc_object_t *p_this )
544 {
545 filter_t *p_filter = (filter_t *)p_this;
546 filter_sys_t *p_sys = p_filter->p_sys;
547 vlc_object_t *p_aout = p_filter->obj.parent;
548 var_DelCallback( p_aout, "pitch-shift", PitchCallback, p_sys );
549 var_Destroy( p_aout, "pitch-shift" );
550 module_unneed( p_sys->resampler, p_sys->resampler->p_module );
551 vlc_object_release( p_sys->resampler );
552 Close( p_this );
553 }
554 #endif
555
556 /*****************************************************************************
557 * DoWork: filter wrapper for transform_buffer
558 *****************************************************************************/
559 static block_t *DoWork( filter_t * p_filter, block_t * p_in_buf )
560 {
561 filter_sys_t *p = p_filter->p_sys;
562
563 if( p_filter->fmt_in.audio.i_rate == p->sample_rate )
564 return p_in_buf;
565
566 double scale = p_filter->fmt_in.audio.i_rate / (double)p->sample_rate;
567 if( scale != p->scale ) {
568 p->scale = scale;
569 p->bytes_stride_scaled = p->bytes_stride * p->scale;
570 p->frames_stride_scaled = p->bytes_stride_scaled / p->bytes_per_frame;
571 p->bytes_to_slide = 0;
572 msg_Dbg( p_filter, "%.3f scale, %.3f stride_in, %i stride_out",
573 p->scale,
574 p->frames_stride_scaled,
575 (int)( p->bytes_stride / p->bytes_per_frame ) );
576 }
577
578 size_t i_outsize = calculate_output_buffer_size ( p_filter, p_in_buf->i_buffer );
579 block_t *p_out_buf = block_Alloc( i_outsize );
580 if( p_out_buf == NULL )
581 return NULL;
582
583 size_t bytes_out = transform_buffer( p_filter,
584 p_in_buf->p_buffer, p_in_buf->i_buffer,
585 p_out_buf->p_buffer );
586
587 p_out_buf->i_buffer = bytes_out;
588 p_out_buf->i_nb_samples = bytes_out / p->bytes_per_frame;
589 p_out_buf->i_dts = p_in_buf->i_dts;
590 p_out_buf->i_pts = p_in_buf->i_pts;
591 p_out_buf->i_length = p_in_buf->i_length;
592
593 block_Release( p_in_buf );
594 return p_out_buf;
595 }
596
597 #ifdef PITCH_SHIFTER
598 static block_t *DoPitchWork( filter_t * p_filter, block_t * p_in_buf )
599 {
600 filter_sys_t *p = p_filter->p_sys;
601
602 float rate_shift = vlc_atomic_load_float( &p->rate_shift );
603
604 /* Set matching rates for resampler's output and scaletempo's input */
605 p->resampler->fmt_out.audio.i_rate = rate_shift;
606 p_filter->fmt_in.audio.i_rate = rate_shift;
607
608 /* Change rate, thus changing pitch */
609 p_in_buf = p->resampler->pf_audio_filter( p->resampler, p_in_buf );
610
611 /* Change tempo while preserving shifted pitch */
612 return DoWork( p_filter, p_in_buf );
613 }
614 #endif
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