1 /*****************************************************************************
2 * filters.c : audio output filters management
3 *****************************************************************************
4 * Copyright (C) 2002-2007 VLC authors and VideoLAN
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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.
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.
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 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
34 #include <vlc_common.h>
35 #include <vlc_dialog.h>
36 #include <vlc_modules.h>
38 #include <vlc_filter.h>
39 #include <vlc_vout.h> /* for vout_Request */
42 #include "aout_internal.h"
44 /*****************************************************************************
45 * FindFilter: find an audio filter for a specific transformation
46 *****************************************************************************/
47 static filter_t * FindFilter( vlc_object_t *obj,
48 const audio_sample_format_t *infmt,
49 const audio_sample_format_t *outfmt )
51 static const char typename[] = "audio converter";
52 const char *type = "audio converter", *name = NULL;
55 p_filter = vlc_custom_create( obj, sizeof(*p_filter), typename );
57 if ( p_filter == NULL ) return NULL;
59 p_filter->fmt_in.audio = *infmt;
60 p_filter->fmt_in.i_codec = infmt->i_format;
61 p_filter->fmt_out.audio = *outfmt;
62 p_filter->fmt_out.i_codec = outfmt->i_format;
64 if( infmt->i_format == outfmt->i_format
65 && infmt->i_physical_channels == outfmt->i_physical_channels
66 && infmt->i_original_channels == outfmt->i_original_channels )
68 assert( infmt->i_rate != outfmt->i_rate );
69 type = "audio resampler";
70 name = "$audio-resampler";
73 p_filter->p_module = module_need( p_filter, type, name, false );
74 if ( p_filter->p_module == NULL )
76 vlc_object_release( p_filter );
80 assert( p_filter->pf_audio_filter );
85 * Splits audio format conversion in two simpler conversions
86 * @return 0 on successful split, -1 if the input and output formats are too
87 * similar to split the conversion.
89 static int SplitConversion( const audio_sample_format_t *restrict infmt,
90 const audio_sample_format_t *restrict outfmt,
91 audio_sample_format_t *midfmt )
95 /* Lastly: resample (after format conversion and remixing) */
96 if( infmt->i_rate != outfmt->i_rate )
97 midfmt->i_rate = infmt->i_rate;
99 /* Penultimately: remix channels (after format conversion) */
100 if( infmt->i_physical_channels != outfmt->i_physical_channels
101 || infmt->i_original_channels != outfmt->i_original_channels )
103 midfmt->i_physical_channels = infmt->i_physical_channels;
104 midfmt->i_original_channels = infmt->i_original_channels;
107 /* Second: convert linear to S16N as intermediate format */
108 if( AOUT_FMT_LINEAR( infmt ) )
110 /* All conversion from linear to S16N must be supported directly. */
111 if( outfmt->i_format == VLC_CODEC_S16N )
113 midfmt->i_format = VLC_CODEC_S16N;
116 /* First: convert non-linear to FI32 as intermediate format */
118 if( outfmt->i_format == VLC_CODEC_FI32 )
120 midfmt->i_format = VLC_CODEC_FI32;
123 assert( !AOUT_FMTS_IDENTICAL( infmt, midfmt ) );
124 aout_FormatPrepare( midfmt );
128 #undef aout_FiltersCreatePipeline
130 * Allocates audio format conversion filters
131 * @param obj parent VLC object for new filters
132 * @param filters table of filters [IN/OUT]
133 * @param nb_filters pointer to the number of filters in the table [IN/OUT]
134 * @param max_filters size of filters table [IN]
135 * @param infmt input audio format
136 * @param outfmt output audio format
137 * @return 0 on success, -1 on failure
139 int aout_FiltersCreatePipeline( vlc_object_t *obj, filter_t **filters,
140 unsigned *nb_filters, unsigned max_filters,
141 const audio_sample_format_t *restrict infmt,
142 const audio_sample_format_t *restrict outfmt )
144 audio_sample_format_t curfmt = *outfmt;
147 max_filters -= *nb_filters;
148 filters += *nb_filters;
149 aout_FormatsPrint( obj, "filter(s)", infmt, outfmt );
151 while( !AOUT_FMTS_IDENTICAL( infmt, &curfmt ) )
153 if( i >= max_filters )
155 msg_Err( obj, "maximum of %u filters reached", max_filters );
156 dialog_Fatal( obj, _("Audio filtering failed"),
157 _("The maximum number of filters (%u) was reached."),
162 /* Make room and prepend a filter */
163 memmove( filters + 1, filters, i * sizeof( *filters ) );
165 *filters = FindFilter( obj, infmt, &curfmt );
166 if( *filters != NULL )
172 audio_sample_format_t midfmt;
173 /* Split the conversion */
174 if( SplitConversion( infmt, &curfmt, &midfmt ) )
176 msg_Err( obj, "conversion pipeline failed: %4.4s -> %4.4s",
177 (const char *)&infmt->i_format,
178 (const char *)&outfmt->i_format );
182 *filters = FindFilter( obj, &midfmt, &curfmt );
183 if( *filters == NULL )
185 msg_Err( obj, "cannot find filter for simple conversion" );
192 msg_Dbg( obj, "conversion pipeline completed" );
197 aout_FiltersDestroyPipeline( filters, i );
202 * Destroys a chain of audio filters.
204 void aout_FiltersDestroyPipeline( filter_t *const *filters, unsigned n )
206 for( unsigned i = 0; i < n; i++ )
208 filter_t *p_filter = filters[i];
210 module_unneed( p_filter, p_filter->p_module );
211 vlc_object_release( p_filter );
215 static inline bool ChangeFiltersString (vlc_object_t *aout, const char *var,
216 const char *filter, bool add)
218 return aout_ChangeFilterString (aout, aout, var, filter, add);
222 * Filters an audio buffer through a chain of filters.
224 void aout_FiltersPlay( filter_t *const *pp_filters,
225 unsigned i_nb_filters, block_t ** pp_block )
227 block_t *p_block = *pp_block;
229 /* TODO: use filter chain */
230 for( unsigned i = 0; (i < i_nb_filters) && (p_block != NULL); i++ )
232 filter_t * p_filter = pp_filters[i];
234 /* Please note that p_block->i_nb_samples & i_buffer
235 * shall be set by the filter plug-in. */
236 p_block = p_filter->pf_audio_filter( p_filter, p_block );
241 /** Callback for visualization selection */
242 static int VisualizationCallback (vlc_object_t *obj, char const *var,
243 vlc_value_t oldval, vlc_value_t newval,
246 audio_output_t *aout = (audio_output_t *)obj;
247 const char *mode = newval.psz_string;
251 ChangeFiltersString (obj, "audio-visual", "goom", false);
252 ChangeFiltersString (obj, "audio-visual", "visual", false);
253 ChangeFiltersString (obj, "audio-visual", "projectm", false);
254 ChangeFiltersString (obj, "audio-visual", "vsxu", false);
256 else if (!strcmp ("goom", mode))
258 ChangeFiltersString (obj, "audio-visual", "visual", false );
259 ChangeFiltersString (obj, "audio-visual", "goom", true );
260 ChangeFiltersString (obj, "audio-visual", "projectm", false );
261 ChangeFiltersString (obj, "audio-visual", "vsxu", false);
263 else if (!strcmp ("projectm", mode))
265 ChangeFiltersString (obj, "audio-visual", "visual", false);
266 ChangeFiltersString (obj, "audio-visual", "goom", false);
267 ChangeFiltersString (obj, "audio-visual", "projectm", true);
268 ChangeFiltersString (obj, "audio-visual", "vsxu", false);
270 else if (!strcmp ("vsxu", mode))
272 ChangeFiltersString (obj, "audio-visual", "visual", false);
273 ChangeFiltersString (obj, "audio-visual", "goom", false);
274 ChangeFiltersString (obj, "audio-visual", "projectm", false);
275 ChangeFiltersString (obj, "audio-visual", "vsxu", true);
279 var_Create (obj, "effect-list", VLC_VAR_STRING);
280 var_SetString (obj, "effect-list", mode);
282 ChangeFiltersString (obj, "audio-visual", "goom", false);
283 ChangeFiltersString (obj, "audio-visual", "visual", true);
284 ChangeFiltersString (obj, "audio-visual", "projectm", false);
287 aout_InputRequestRestart (aout);
288 (void) var; (void) oldval; (void) data;
292 static int EqualizerCallback (vlc_object_t *obj, char const *var,
293 vlc_value_t oldval, vlc_value_t newval,
296 audio_output_t *aout = (audio_output_t *)obj;
297 char *mode = newval.psz_string;
301 ret = ChangeFiltersString (obj, "audio-filter", "equalizer", false);
304 var_Create (obj, "equalizer-preset", VLC_VAR_STRING);
305 var_SetString (obj, "equalizer-preset", mode);
306 ret = ChangeFiltersString (obj, "audio-filter", "equalizer", true);
311 aout_InputRequestRestart (aout);
312 (void) var; (void) oldval; (void) data;
316 static vout_thread_t *RequestVout (void *data, vout_thread_t *vout,
317 video_format_t *fmt, bool recycle)
319 audio_output_t *aout = data;
320 vout_configuration_t cfg = {
329 return vout_Request (aout, &cfg);
332 vout_thread_t *aout_filter_RequestVout (filter_t *filter, vout_thread_t *vout,
335 /* NOTE: This only works from audio output.
336 * If you want to use visualization filters from another place, you will
337 * need to add a new pf_aout_request_vout callback or store a pointer
338 * to aout_request_vout_t inside filter_t (i.e. a level of indirection). */
339 aout_owner_t *owner = aout_owner ((audio_output_t *)filter->p_parent);
340 aout_request_vout_t *req = &owner->request_vout;
342 return req->pf_request_vout (req->p_private, vout, fmt,
343 owner->recycle_vout);
346 static filter_t *CreateFilter (vlc_object_t *parent, const char *name,
347 const audio_sample_format_t *restrict infmt,
348 const audio_sample_format_t *restrict outfmt,
351 filter_t *filter = vlc_custom_create (parent, sizeof (*filter),
353 if (unlikely(filter == NULL))
356 /*filter->p_owner = NOT NEEDED;*/
357 filter->fmt_in.i_codec = infmt->i_format;
358 filter->fmt_in.audio = *infmt;
359 filter->fmt_out.i_codec = outfmt->i_format;
360 filter->fmt_out.audio = *outfmt;
364 filter->p_module = module_need (filter, "audio filter", name, true);
365 if (filter->p_module != NULL)
368 /* If probing failed, formats shall not have been modified. */
369 assert (AOUT_FMTS_IDENTICAL(&filter->fmt_in.audio, infmt));
370 assert (AOUT_FMTS_IDENTICAL(&filter->fmt_out.audio, outfmt));
373 filter->p_module = module_need (filter, "visualization2", name, true);
374 if (filter->p_module != NULL)
377 vlc_object_release (filter);
382 * Sets up the audio filters.
384 int aout_FiltersNew (audio_output_t *aout,
385 const audio_sample_format_t *restrict infmt,
386 const audio_sample_format_t *restrict outfmt,
387 const aout_request_vout_t *request_vout)
389 aout_owner_t *owner = aout_owner (aout);
391 /* Prepare format structure */
392 aout_FormatPrint (aout, "input", infmt);
393 audio_sample_format_t input_format = *infmt;
394 audio_sample_format_t output_format = *outfmt;
396 /* Now add user filters */
397 owner->nb_filters = 0;
398 owner->rate_filter = NULL;
399 owner->resampler = NULL;
401 if (!AOUT_FMT_LINEAR(outfmt))
404 var_AddCallback (aout, "visual", VisualizationCallback, NULL);
405 var_AddCallback (aout, "equalizer", EqualizerCallback, NULL);
407 const char *scaletempo =
408 var_InheritBool (aout, "audio-time-stretch") ? "scaletempo" : NULL;
409 char *filters = var_InheritString (aout, "audio-filter");
410 char *visual = var_InheritString (aout, "audio-visual");
412 if (request_vout != NULL)
413 owner->request_vout = *request_vout;
416 owner->request_vout.pf_request_vout = RequestVout;
417 owner->request_vout.p_private = aout;
419 owner->recycle_vout = (visual != NULL) && *visual;
421 /* parse user filter lists */
422 const char *list[AOUT_MAX_FILTERS];
425 if (scaletempo != NULL)
426 list[n++] = scaletempo;
429 char *p = filters, *name;
430 while ((name = strsep (&p, " :")) != NULL && n < AOUT_MAX_FILTERS)
433 if (visual != NULL && n < AOUT_MAX_FILTERS)
436 for (unsigned i = 0; i < n; i++)
438 const char *name = list[i];
440 if (owner->nb_filters >= AOUT_MAX_FILTERS)
442 msg_Err (aout, "maximum of %u filters reached", AOUT_MAX_FILTERS);
443 msg_Err (aout, "cannot add user filter %s (skipped)", name);
447 filter_t *filter = CreateFilter (VLC_OBJECT(aout), name,
448 &input_format, &output_format,
452 msg_Err (aout, "cannot add user filter %s (skipped)", name);
456 /* convert to the filter input format if necessary */
457 if (aout_FiltersCreatePipeline (VLC_OBJECT(aout), owner->filters,
459 AOUT_MAX_FILTERS - 1,
460 &input_format, &filter->fmt_in.audio))
462 msg_Err (aout, "cannot add user filter %s (skipped)", name);
463 module_unneed (filter, filter->p_module);
464 vlc_object_release (filter);
468 assert (owner->nb_filters < AOUT_MAX_FILTERS);
469 owner->filters[owner->nb_filters++] = filter;
470 input_format = filter->fmt_out.audio;
472 if (name == scaletempo)
473 owner->rate_filter = filter;
478 /* convert to the output format (minus resampling) if necessary */
479 output_format.i_rate = input_format.i_rate;
480 if (aout_FiltersCreatePipeline (VLC_OBJECT(aout), owner->filters,
481 &owner->nb_filters, AOUT_MAX_FILTERS,
482 &input_format, &output_format))
484 msg_Err (aout, "cannot setup filtering pipeline");
487 input_format = output_format;
489 /* insert the resampler */
490 output_format.i_rate = outfmt->i_rate;
491 assert (AOUT_FMTS_IDENTICAL(&output_format, outfmt));
493 unsigned rate_bak = input_format.i_rate;
494 if (output_format.i_rate == input_format.i_rate)
495 /* For historical reasons, a different rate is required to probe
496 * resampling filters. */
497 input_format.i_rate++;
498 owner->resampler = FindFilter (VLC_OBJECT(aout), &input_format,
500 if (owner->resampler == NULL)
502 msg_Err (aout, "cannot setup a resampler");
505 owner->resampler->fmt_in.audio.i_rate = rate_bak;
506 if (owner->rate_filter == NULL)
507 owner->rate_filter = owner->resampler;
512 aout_FiltersDestroyPipeline (owner->filters, owner->nb_filters);
513 var_DelCallback (aout, "equalizer", EqualizerCallback, NULL);
514 var_DelCallback (aout, "visual", VisualizationCallback, NULL);
519 * Destroys the audio filters.
521 void aout_FiltersDelete (audio_output_t *aout)
523 aout_owner_t *owner = aout_owner (aout);
525 if (owner->resampler != NULL)
526 aout_FiltersDestroyPipeline (&owner->resampler, 1);
527 aout_FiltersDestroyPipeline (owner->filters, owner->nb_filters);
528 var_DelCallback (aout, "equalizer", EqualizerCallback, NULL);
529 var_DelCallback (aout, "visual", VisualizationCallback, NULL);
531 /* XXX We need to update recycle_vout before calling
532 * aout_FiltersDestroyPipeline().
533 * FIXME There may be a race condition if audio-visual is updated between
534 * aout_FiltersDestroy() and the next aout_FiltersNew().
536 char *visual = var_InheritString (aout, "audio-visual");
537 owner->recycle_vout = (visual != NULL) && *visual;