1 /*****************************************************************************
2 * compressor.c: dynamic range compressor, ported from plugins from LADSPA SWH
3 *****************************************************************************
4 * Copyright (C) 2010 Ronald Wright
7 * Author: Ronald Wright <logiconcepts819@gmail.com>
8 * Original author: Steve Harris <steve@plugin.org.uk>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
36 #include <vlc_common.h>
37 #include <vlc_plugin.h>
40 #include <vlc_filter.h>
42 /*****************************************************************************
44 *****************************************************************************/
48 #define DB_TABLE_SIZE (1024)
49 #define DB_MIN (-60.0f)
50 #define DB_MAX (24.0f)
51 #define LIN_TABLE_SIZE (1024)
52 #define LIN_MIN (0.0000000002f)
53 #define LIN_MAX (9.0f)
54 #define DB_DEFAULT_CUBE
55 #define RMS_BUF_SIZE (960)
56 #define LOOKAHEAD_SIZE ((RMS_BUF_SIZE)<<1)
58 #define LIN_INTERP(f,a,b) ((a) + (f) * ( (b) - (a) ))
59 #define LIMIT(v,l,u) (v < l ? l : ( v > u ? u : v ))
63 float pf_buf[RMS_BUF_SIZE];
74 float pf_vals[AOUT_CHAN_MAX];
77 } p_buf[LOOKAHEAD_SIZE];
97 float pf_db_data[DB_TABLE_SIZE];
98 float pf_lin_data[LIN_TABLE_SIZE];
118 static int Open ( vlc_object_t * );
119 static void Close ( vlc_object_t * );
120 static block_t *DoWork ( filter_t *, block_t * );
122 static void DbInit ( filter_sys_t * );
123 static float Db2Lin ( float, filter_sys_t * );
124 static float Lin2Db ( float, filter_sys_t * );
125 #ifdef DB_DEFAULT_CUBE
126 static float CubeInterp ( const float, const float, const float,
127 const float, const float );
129 static void RoundToZero ( float * );
130 static float Max ( float, float );
131 static float Clamp ( float, float, float );
132 static int Round ( float );
133 static float RmsEnvProcess ( rms_env *, const float );
134 static void BufferProcess ( float *, int, float, float, lookahead * );
136 static int RMSPeakCallback ( vlc_object_t *, char const *, vlc_value_t,
137 vlc_value_t, void * );
138 static int AttackCallback ( vlc_object_t *, char const *, vlc_value_t,
139 vlc_value_t, void * );
140 static int ReleaseCallback ( vlc_object_t *, char const *, vlc_value_t,
141 vlc_value_t, void * );
142 static int ThresholdCallback ( vlc_object_t *, char const *, vlc_value_t,
143 vlc_value_t, void * );
144 static int RatioCallback ( vlc_object_t *, char const *, vlc_value_t,
145 vlc_value_t, void * );
146 static int KneeCallback ( vlc_object_t *, char const *, vlc_value_t,
147 vlc_value_t, void * );
148 static int MakeupGainCallback ( vlc_object_t *, char const *, vlc_value_t,
149 vlc_value_t, void * );
151 /*****************************************************************************
153 *****************************************************************************/
155 #define RMS_PEAK_TEXT N_( "RMS/peak" )
156 #define RMS_PEAK_LONGTEXT N_( "Set the RMS/peak (0 ... 1)." )
158 #define ATTACK_TEXT N_( "Attack time" )
159 #define ATTACK_LONGTEXT N_( \
160 "Set the attack time in milliseconds (1.5 ... 400)." )
162 #define RELEASE_TEXT N_( "Release time" )
163 #define RELEASE_LONGTEXT N_( \
164 "Set the release time in milliseconds (2 ... 800)." )
166 #define THRESHOLD_TEXT N_( "Threshold level" )
167 #define THRESHOLD_LONGTEXT N_( "Set the threshold level in dB (-30 ... 0)." )
169 #define RATIO_TEXT N_( "Ratio" )
170 #define RATIO_LONGTEXT N_( "Set the ratio (n:1) (1 ... 20)." )
172 #define KNEE_TEXT N_( "Knee radius" )
173 #define KNEE_LONGTEXT N_( "Set the knee radius in dB (1 ... 10)." )
175 #define MAKEUP_GAIN_TEXT N_( "Makeup gain" )
176 #define MAKEUP_GAIN_LONGTEXT N_( "Set the makeup gain in dB (0 ... 24)." )
179 set_shortname( _("Compressor") )
180 set_description( _("Dynamic range compressor") )
181 set_capability( "audio filter", 0 )
182 set_category( CAT_AUDIO )
183 set_subcategory( SUBCAT_AUDIO_AFILTER )
185 add_float( "compressor-rms-peak", 0.0, RMS_PEAK_TEXT,
186 RMS_PEAK_LONGTEXT, false )
187 add_float( "compressor-attack", 25.0, ATTACK_TEXT,
188 ATTACK_LONGTEXT, false )
189 add_float( "compressor-release", 100.0, RELEASE_TEXT,
190 RELEASE_LONGTEXT, false )
191 add_float( "compressor-threshold", -11.0, THRESHOLD_TEXT,
192 THRESHOLD_LONGTEXT, false )
193 add_float( "compressor-ratio", 8.0, RATIO_TEXT,
194 RATIO_LONGTEXT, false )
195 add_float( "compressor-knee", 2.5, KNEE_TEXT,
196 KNEE_LONGTEXT, false )
197 add_float( "compressor-makeup-gain", 7.0, MAKEUP_GAIN_TEXT,
198 MAKEUP_GAIN_LONGTEXT, false )
199 set_callbacks( Open, Close )
200 add_shortcut( "compressor" )
203 /*****************************************************************************
204 * Open: initialize interface
205 *****************************************************************************/
207 static int Open( vlc_object_t *p_this )
209 filter_t *p_filter = (filter_t*)p_this;
210 vlc_object_t *p_aout = p_filter->p_parent;
211 float f_sample_rate = p_filter->fmt_in.audio.i_rate;
214 /* Initialize the filter parameter structure */
215 filter_sys_t *p_sys = p_filter->p_sys = calloc( 1, sizeof(*p_sys) );
221 /* Initialize the attack lookup table */
222 p_sys->pf_as[0] = 1.0f;
223 for( int i = 1; i < A_TBL; i++ )
225 p_sys->pf_as[i] = expf( -1.0f / ( f_sample_rate * i / A_TBL ) );
228 /* Calculate the RMS and lookahead sizes from the sample rate */
229 f_num = 0.01f * f_sample_rate;
230 p_sys->rms.i_count = Round( Clamp( 0.5f * f_num, 1.0f, RMS_BUF_SIZE ) );
231 p_sys->la.i_count = Round( Clamp( f_num, 1.0f, LOOKAHEAD_SIZE ) );
233 /* Initialize decibel lookup tables */
236 /* Restore the last saved settings */
237 p_sys->f_rms_peak = var_CreateGetFloat( p_aout, "compressor-rms-peak" );
238 p_sys->f_attack = var_CreateGetFloat( p_aout, "compressor-attack" );
239 p_sys->f_release = var_CreateGetFloat( p_aout, "compressor-release" );
240 p_sys->f_threshold = var_CreateGetFloat( p_aout, "compressor-threshold" );
241 p_sys->f_ratio = var_CreateGetFloat( p_aout, "compressor-ratio" );
242 p_sys->f_knee = var_CreateGetFloat( p_aout, "compressor-knee" );
243 p_sys->f_makeup_gain =
244 var_CreateGetFloat( p_aout, "compressor-makeup-gain" );
246 /* Initialize the mutex */
247 vlc_mutex_init( &p_sys->lock );
249 /* Add our own callbacks */
250 var_AddCallback( p_aout, "compressor-rms-peak", RMSPeakCallback, p_sys );
251 var_AddCallback( p_aout, "compressor-attack", AttackCallback, p_sys );
252 var_AddCallback( p_aout, "compressor-release", ReleaseCallback, p_sys );
253 var_AddCallback( p_aout, "compressor-threshold", ThresholdCallback, p_sys );
254 var_AddCallback( p_aout, "compressor-ratio", RatioCallback, p_sys );
255 var_AddCallback( p_aout, "compressor-knee", KneeCallback, p_sys );
256 var_AddCallback( p_aout, "compressor-makeup-gain", MakeupGainCallback, p_sys );
258 /* Set the filter function */
259 p_filter->fmt_in.audio.i_format = VLC_CODEC_FL32;
260 p_filter->fmt_out.audio = p_filter->fmt_in.audio;
261 p_filter->pf_audio_filter = DoWork;
263 /* At this stage, we are ready! */
264 msg_Dbg( p_filter, "compressor successfully initialized" );
268 /*****************************************************************************
269 * Close: destroy interface
270 *****************************************************************************/
272 static void Close( vlc_object_t *p_this )
274 filter_t *p_filter = (filter_t*)p_this;
275 vlc_object_t *p_aout = p_filter->p_parent;
276 filter_sys_t *p_sys = p_filter->p_sys;
278 /* Remove our callbacks */
279 var_DelCallback( p_aout, "compressor-rms-peak", RMSPeakCallback, p_sys );
280 var_DelCallback( p_aout, "compressor-attack", AttackCallback, p_sys );
281 var_DelCallback( p_aout, "compressor-release", ReleaseCallback, p_sys );
282 var_DelCallback( p_aout, "compressor-threshold", ThresholdCallback, p_sys );
283 var_DelCallback( p_aout, "compressor-ratio", RatioCallback, p_sys );
284 var_DelCallback( p_aout, "compressor-knee", KneeCallback, p_sys );
285 var_DelCallback( p_aout, "compressor-makeup-gain", MakeupGainCallback, p_sys );
287 /* Destroy the mutex */
288 vlc_mutex_destroy( &p_sys->lock );
290 /* Destroy the filter parameter structure */
294 /*****************************************************************************
295 * DoWork: process samples buffer
296 *****************************************************************************/
298 static block_t * DoWork( filter_t * p_filter, block_t * p_in_buf )
300 int i_samples = p_in_buf->i_nb_samples;
301 int i_channels = aout_FormatNbChannels( &p_filter->fmt_in.audio );
302 float *pf_buf = (float*)p_in_buf->p_buffer;
304 /* Current parameters */
305 filter_sys_t *p_sys = p_filter->p_sys;
307 /* Fetch the configurable parameters */
308 vlc_mutex_lock( &p_sys->lock );
310 float f_rms_peak = p_sys->f_rms_peak; /* RMS/peak */
311 float f_attack = p_sys->f_attack; /* Attack time (ms) */
312 float f_release = p_sys->f_release; /* Release time (ms) */
313 float f_threshold = p_sys->f_threshold; /* Threshold level (dB) */
314 float f_ratio = p_sys->f_ratio; /* Ratio (n:1) */
315 float f_knee = p_sys->f_knee; /* Knee radius (dB) */
316 float f_makeup_gain = p_sys->f_makeup_gain; /* Makeup gain (dB) */
318 vlc_mutex_unlock( &p_sys->lock );
320 /* Fetch the internal parameters */
321 float f_amp = p_sys->f_amp;
322 float *pf_as = p_sys->pf_as;
323 float f_env = p_sys->f_env;
324 float f_env_peak = p_sys->f_env_peak;
325 float f_env_rms = p_sys->f_env_rms;
326 float f_gain = p_sys->f_gain;
327 float f_gain_out = p_sys->f_gain_out;
328 rms_env *p_rms = &p_sys->rms;
329 float f_sum = p_sys->f_sum;
330 lookahead *p_la = &p_sys->la;
332 /* Prepare other compressor parameters */
333 float f_ga = f_attack < 2.0f ? 0.0f :
334 pf_as[Round( f_attack * 0.001f * ( A_TBL - 1 ) )];
335 float f_gr = pf_as[Round( f_release * 0.001f * ( A_TBL - 1 ) )];
336 float f_rs = ( f_ratio - 1.0f ) / f_ratio;
337 float f_mug = Db2Lin( f_makeup_gain, p_sys );
338 float f_knee_min = Db2Lin( f_threshold - f_knee, p_sys );
339 float f_knee_max = Db2Lin( f_threshold + f_knee, p_sys );
340 float f_ef_a = f_ga * 0.25f;
341 float f_ef_ai = 1.0f - f_ef_a;
343 /* Process the current buffer */
344 for( int i = 0; i < i_samples; i++ )
346 float f_lev_in_old, f_lev_in_new;
348 /* Now, compress the pre-equalized audio (ported from sc4_1882
349 * plugin with a few modifications) */
351 /* Fetch the old delayed buffer value */
352 f_lev_in_old = p_la->p_buf[p_la->i_pos].f_lev_in;
354 /* Find the peak value of current sample. This becomes the new delayed
355 * buffer value that replaces the old one in the lookahead array */
356 f_lev_in_new = fabs( pf_buf[0] );
357 for( int i_chan = 1; i_chan < i_channels; i_chan++ )
359 f_lev_in_new = Max( f_lev_in_new, fabs( pf_buf[i_chan] ) );
361 p_la->p_buf[p_la->i_pos].f_lev_in = f_lev_in_new;
363 /* Add the square of the peak value to a running sum */
364 f_sum += f_lev_in_new * f_lev_in_new;
366 /* Update the RMS envelope */
367 if( f_amp > f_env_rms )
369 f_env_rms = f_env_rms * f_ga + f_amp * ( 1.0f - f_ga );
373 f_env_rms = f_env_rms * f_gr + f_amp * ( 1.0f - f_gr );
375 RoundToZero( &f_env_rms );
377 /* Update the peak envelope */
378 if( f_lev_in_old > f_env_peak )
380 f_env_peak = f_env_peak * f_ga + f_lev_in_old * ( 1.0f - f_ga );
384 f_env_peak = f_env_peak * f_gr + f_lev_in_old * ( 1.0f - f_gr );
386 RoundToZero( &f_env_peak );
388 /* Process the RMS value and update the output gain every 4 samples */
389 if( ( p_sys->i_count++ & 3 ) == 3 )
391 /* Process the RMS value by placing in the mean square value, and
392 * reset the running sum */
393 f_amp = RmsEnvProcess( p_rms, f_sum * 0.25f );
395 if( isnan( f_env_rms ) )
397 /* This can happen sometimes, but I don't know why. */
401 /* Find the superposition of the RMS and peak envelopes */
402 f_env = LIN_INTERP( f_rms_peak, f_env_rms, f_env_peak );
404 /* Update the output gain */
405 if( f_env <= f_knee_min )
407 /* Gain below the knee (and below the threshold) */
410 else if( f_env < f_knee_max )
412 /* Gain within the knee */
413 const float f_x = -( f_threshold
414 - f_knee - Lin2Db( f_env, p_sys ) ) / f_knee;
415 f_gain_out = Db2Lin( -f_knee * f_rs * f_x * f_x * 0.25f,
420 /* Gain above the knee (and above the threshold) */
421 f_gain_out = Db2Lin( ( f_threshold - Lin2Db( f_env, p_sys ) )
426 /* Find the total gain */
427 f_gain = f_gain * f_ef_a + f_gain_out * f_ef_ai;
429 /* Write the resulting buffer to the output */
430 BufferProcess( pf_buf, i_channels, f_gain, f_mug, p_la );
431 pf_buf += i_channels;
434 /* Update the internal parameters */
435 p_sys->f_sum = f_sum;
436 p_sys->f_amp = f_amp;
437 p_sys->f_gain = f_gain;
438 p_sys->f_gain_out = f_gain_out;
439 p_sys->f_env = f_env;
440 p_sys->f_env_rms = f_env_rms;
441 p_sys->f_env_peak = f_env_peak;
446 /*****************************************************************************
447 * Helper functions for compressor
448 *****************************************************************************/
450 static void DbInit( filter_sys_t * p_sys )
452 float *pf_lin_data = p_sys->pf_lin_data;
453 float *pf_db_data = p_sys->pf_db_data;
455 /* Fill linear lookup table */
456 for( int i = 0; i < LIN_TABLE_SIZE; i++ )
458 pf_lin_data[i] = powf( 10.0f, ( ( DB_MAX - DB_MIN ) *
459 (float)i / LIN_TABLE_SIZE + DB_MIN ) / 20.0f );
462 /* Fill logarithmic lookup table */
463 for( int i = 0; i < DB_TABLE_SIZE; i++ )
465 pf_db_data[i] = 20.0f * log10f( ( LIN_MAX - LIN_MIN ) *
466 (float)i / DB_TABLE_SIZE + LIN_MIN );
470 static float Db2Lin( float f_db, filter_sys_t * p_sys )
472 float f_scale = ( f_db - DB_MIN ) * LIN_TABLE_SIZE / ( DB_MAX - DB_MIN );
473 int i_base = Round( f_scale - 0.5f );
474 float f_ofs = f_scale - i_base;
475 float *pf_lin_data = p_sys->pf_lin_data;
481 else if( i_base > LIN_TABLE_SIZE - 3 )
483 return pf_lin_data[LIN_TABLE_SIZE - 2];
486 #ifdef DB_DEFAULT_CUBE
487 return CubeInterp( f_ofs, pf_lin_data[i_base - 1],
489 pf_lin_data[i_base + 1],
490 pf_lin_data[i_base + 2] );
492 return ( 1.0f - f_ofs ) * pf_lin_data[i_base]
493 + f_ofs * pf_lin_data[i_base + 1];
497 static float Lin2Db( float f_lin, filter_sys_t * p_sys )
499 float f_scale = ( f_lin - LIN_MIN ) * DB_TABLE_SIZE / ( LIN_MAX - LIN_MIN );
500 int i_base = Round( f_scale - 0.5f );
501 float f_ofs = f_scale - i_base;
502 float *pf_db_data = p_sys->pf_db_data;
506 return pf_db_data[2] * f_scale * 0.5f - 23.0f * ( 2.0f - f_scale );
508 else if( i_base > DB_TABLE_SIZE - 3 )
510 return pf_db_data[DB_TABLE_SIZE - 2];
513 #ifdef DB_DEFAULT_CUBE
514 return CubeInterp( f_ofs, pf_db_data[i_base - 1],
516 pf_db_data[i_base + 1],
517 pf_db_data[i_base + 2] );
519 return ( 1.0f - f_ofs ) * pf_db_data[i_base]
520 + f_ofs * pf_db_data[i_base + 1];
524 #ifdef DB_DEFAULT_CUBE
525 /* Cubic interpolation function */
526 static float CubeInterp( const float f_fr, const float f_inm1,
531 return f_in + 0.5f * f_fr * ( f_inp1 - f_inm1 +
532 f_fr * ( 4.0f * f_inp1 + 2.0f * f_inm1 - 5.0f * f_in - f_inp2 +
533 f_fr * ( 3.0f * ( f_in - f_inp1 ) - f_inm1 + f_inp2 ) ) );
537 /* Zero out denormals by adding and subtracting a small number, from Laurent
539 static void RoundToZero( float *pf_x )
541 static const float f_anti_denormal = 1e-18;
543 *pf_x += f_anti_denormal;
544 *pf_x -= f_anti_denormal;
547 /* A set of branchless clipping operations from Laurent de Soras */
549 static float Max( float f_x, float f_a )
559 static float Clamp( float f_x, float f_a, float f_b )
561 const float f_x1 = fabsf( f_x - f_a );
562 const float f_x2 = fabsf( f_x - f_b );
564 f_x = f_x1 + f_a + f_b;
571 /* Round float to int using IEEE int* hack */
572 static int Round( float f_x )
579 return p.i - 0x4b400000;
582 /* Calculate current level from root-mean-squared of circular buffer ("RMS") */
583 static float RmsEnvProcess( rms_env * p_r, const float f_x )
585 /* Remove the old term from the sum */
586 p_r->f_sum -= p_r->pf_buf[p_r->i_pos];
588 /* Add the new term to the sum */
591 /* If the sum is small enough, make it zero */
592 if( p_r->f_sum < 1.0e-6f )
597 /* Replace the old term in the array with the new one */
598 p_r->pf_buf[p_r->i_pos] = f_x;
600 /* Go to the next position for the next RMS calculation */
601 p_r->i_pos = ( p_r->i_pos + 1 ) % ( p_r->i_count );
603 /* Return the RMS value */
604 return sqrt( p_r->f_sum / p_r->i_count );
607 /* Output the compressed delayed buffer and store the current buffer. Uses a
608 * circular array, just like the one used in calculating the RMS of the buffer
610 static void BufferProcess( float * pf_buf, int i_channels, float f_gain,
611 float f_mug, lookahead * p_la )
613 /* Loop through every channel */
614 for( int i_chan = 0; i_chan < i_channels; i_chan++ )
616 float f_x = pf_buf[i_chan]; /* Current buffer value */
618 /* Output the compressed delayed buffer value */
619 pf_buf[i_chan] = p_la->p_buf[p_la->i_pos].pf_vals[i_chan]
622 /* Update the delayed buffer value */
623 p_la->p_buf[p_la->i_pos].pf_vals[i_chan] = f_x;
626 /* Go to the next delayed buffer value for the next run */
627 p_la->i_pos = ( p_la->i_pos + 1 ) % ( p_la->i_count );
630 /*****************************************************************************
632 *****************************************************************************/
633 static int RMSPeakCallback( vlc_object_t *p_this, char const *psz_cmd,
634 vlc_value_t oldval, vlc_value_t newval,
637 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
638 filter_sys_t *p_sys = p_data;
640 vlc_mutex_lock( &p_sys->lock );
641 p_sys->f_rms_peak = Clamp( newval.f_float, 0.0f, 1.0f );
642 vlc_mutex_unlock( &p_sys->lock );
647 static int AttackCallback( vlc_object_t *p_this, char const *psz_cmd,
648 vlc_value_t oldval, vlc_value_t newval,
651 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
652 filter_sys_t *p_sys = p_data;
654 vlc_mutex_lock( &p_sys->lock );
655 p_sys->f_attack = Clamp( newval.f_float, 1.5f, 400.0f );
656 vlc_mutex_unlock( &p_sys->lock );
661 static int ReleaseCallback( vlc_object_t *p_this, char const *psz_cmd,
662 vlc_value_t oldval, vlc_value_t newval,
665 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
666 filter_sys_t *p_sys = p_data;
668 vlc_mutex_lock( &p_sys->lock );
669 p_sys->f_release = Clamp( newval.f_float, 2.0f, 800.0f );
670 vlc_mutex_unlock( &p_sys->lock );
675 static int ThresholdCallback( vlc_object_t *p_this, char const *psz_cmd,
676 vlc_value_t oldval, vlc_value_t newval,
679 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
680 filter_sys_t *p_sys = p_data;
682 vlc_mutex_lock( &p_sys->lock );
683 p_sys->f_threshold = Clamp( newval.f_float, -30.0f, 0.0f );
684 vlc_mutex_unlock( &p_sys->lock );
689 static int RatioCallback( vlc_object_t *p_this, char const *psz_cmd,
690 vlc_value_t oldval, vlc_value_t newval,
693 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
694 filter_sys_t *p_sys = p_data;
696 vlc_mutex_lock( &p_sys->lock );
697 p_sys->f_ratio = Clamp( newval.f_float, 1.0f, 20.0f );
698 vlc_mutex_unlock( &p_sys->lock );
703 static int KneeCallback( vlc_object_t *p_this, char const *psz_cmd,
704 vlc_value_t oldval, vlc_value_t newval,
707 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
708 filter_sys_t *p_sys = p_data;
710 vlc_mutex_lock( &p_sys->lock );
711 p_sys->f_knee = Clamp( newval.f_float, 1.0f, 10.0f );
712 vlc_mutex_unlock( &p_sys->lock );
717 static int MakeupGainCallback( vlc_object_t *p_this, char const *psz_cmd,
718 vlc_value_t oldval, vlc_value_t newval,
721 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
722 filter_sys_t *p_sys = p_data;
724 vlc_mutex_lock( &p_sys->lock );
725 p_sys->f_makeup_gain = Clamp( newval.f_float, 0.0f, 24.0f );
726 vlc_mutex_unlock( &p_sys->lock );