1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2004, 2006 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 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 General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
39 #include "equalizer_presets.h"
41 * - add tables for other rates ( 22500, 11250, ...)
42 * - optimize a bit (you can hardly do slower ;)
43 * - add tables for more bands (15 and 32 would be cool), maybe with auto coeffs
44 * computation (not too hard once the Q is found).
45 * - support for external preset
46 * - callback to handle preset changes on the fly
50 /*****************************************************************************
52 *****************************************************************************/
53 static int Open ( vlc_object_t * );
54 static void Close( vlc_object_t * );
56 #define PRESET_TEXT N_( "Equalizer preset" )
57 #define PRESET_LONGTEXT N_("Preset to use for the equalizer." )
59 #define BANDS_TEXT N_( "Bands gain")
60 #define BANDS_LONGTEXT N_( \
61 "Don't use presets, but manually specified bands. You need to " \
62 "provide 10 values between -20dB and 20dB, separated by spaces, " \
63 "e.g. \"0 2 4 2 0 -2 -4 -2 0\"." )
65 #define TWOPASS_TEXT N_( "Two pass" )
66 #define TWOPASS_LONGTEXT N_( "Filter the audio twice. This provides a more " \
69 #define PREAMP_TEXT N_("Global gain" )
70 #define PREAMP_LONGTEXT N_("Set the global gain in dB (-20 ... 20)." )
73 set_description( N_("Equalizer with 10 bands") );
74 set_shortname( N_("Equalizer" ) );
75 set_capability( "audio filter", 0 );
76 set_category( CAT_AUDIO );
77 set_subcategory( SUBCAT_AUDIO_AFILTER );
79 add_string( "equalizer-preset", "flat", NULL, PRESET_TEXT,
80 PRESET_LONGTEXT, false );
81 change_string_list( preset_list, preset_list_text, 0 );
82 add_string( "equalizer-bands", NULL, NULL, BANDS_TEXT,
83 BANDS_LONGTEXT, true );
84 add_bool( "equalizer-2pass", 0, NULL, TWOPASS_TEXT,
85 TWOPASS_LONGTEXT, true );
86 add_float( "equalizer-preamp", 12.0, NULL, PREAMP_TEXT,
87 PREAMP_LONGTEXT, true );
88 set_callbacks( Open, Close );
89 add_shortcut( "equalizer" );
92 /*****************************************************************************
94 *****************************************************************************/
95 typedef struct aout_filter_sys_t
97 /* Filter static config */
107 /* Filter dyn config */
108 float *f_amp; /* Per band amp */
109 float f_gamp; /* Global preamp */
116 /* Second filter state */
118 float y2[32][128][2];
122 static void DoWork( aout_instance_t *, aout_filter_t *,
123 aout_buffer_t *, aout_buffer_t * );
125 #define EQZ_IN_FACTOR (0.25)
126 static int EqzInit( aout_filter_t *, int );
127 static void EqzFilter( aout_filter_t *, float *, float *,
129 static void EqzClean( aout_filter_t * );
131 static int PresetCallback( vlc_object_t *, char const *,
132 vlc_value_t, vlc_value_t, void * );
133 static int PreampCallback( vlc_object_t *, char const *,
134 vlc_value_t, vlc_value_t, void * );
135 static int BandsCallback ( vlc_object_t *, char const *,
136 vlc_value_t, vlc_value_t, void * );
140 /*****************************************************************************
142 *****************************************************************************/
143 static int Open( vlc_object_t *p_this )
145 aout_filter_t *p_filter = (aout_filter_t *)p_this;
146 aout_filter_sys_t *p_sys;
149 if( p_filter->input.i_format != VLC_FOURCC('f','l','3','2' ) ||
150 p_filter->output.i_format != VLC_FOURCC('f','l','3','2') )
153 p_filter->input.i_format = VLC_FOURCC('f','l','3','2');
154 p_filter->output.i_format = VLC_FOURCC('f','l','3','2');
155 msg_Warn( p_filter, "bad input or output format" );
157 if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
160 memcpy( &p_filter->output, &p_filter->input,
161 sizeof(audio_sample_format_t) );
162 msg_Warn( p_filter, "input and output formats are not similar" );
170 p_filter->pf_do_work = DoWork;
171 p_filter->b_in_place = true;
173 /* Allocate structure */
174 p_sys = p_filter->p_sys = malloc( sizeof( aout_filter_sys_t ) );
176 if( EqzInit( p_filter, p_filter->input.i_rate ) )
182 /*****************************************************************************
183 * Close: close the plugin
184 *****************************************************************************/
185 static void Close( vlc_object_t *p_this )
187 aout_filter_t *p_filter = (aout_filter_t *)p_this;
188 aout_filter_sys_t *p_sys = p_filter->p_sys;
190 EqzClean( p_filter );
194 /*****************************************************************************
195 * DoWork: process samples buffer
196 *****************************************************************************
198 *****************************************************************************/
199 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
200 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
203 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
204 p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes;
206 EqzFilter( p_filter, (float*)p_out_buf->p_buffer,
207 (float*)p_in_buf->p_buffer, p_in_buf->i_nb_samples,
208 aout_FormatNbChannels( &p_filter->input ) );
211 /*****************************************************************************
213 *****************************************************************************/
224 } band[EQZ_BANDS_MAX];
228 /* Value from equ-xmms */
229 static const eqz_config_t eqz_config_44100_10b =
233 { 60, 0.003013, 0.993973, 1.993901 },
234 { 170, 0.008490, 0.983019, 1.982437 },
235 { 310, 0.015374, 0.969252, 1.967331 },
236 { 600, 0.029328, 0.941343, 1.934254 },
237 { 1000, 0.047918, 0.904163, 1.884869 },
238 { 3000, 0.130408, 0.739184, 1.582718 },
239 { 6000, 0.226555, 0.546889, 1.015267 },
240 { 12000, 0.344937, 0.310127, -0.181410 },
241 { 14000, 0.366438, 0.267123, -0.521151 },
242 { 16000, 0.379009, 0.241981, -0.808451 },
245 static const eqz_config_t eqz_config_48000_10b =
249 { 60, 0.002769, 0.994462, 1.994400 },
250 { 170, 0.007806, 0.984388, 1.983897 },
251 { 310, 0.014143, 0.971714, 1.970091 },
252 { 600, 0.027011, 0.945978, 1.939979 },
253 { 1000, 0.044203, 0.911595, 1.895241 },
254 { 3000, 0.121223, 0.757553, 1.623767 },
255 { 6000, 0.212888, 0.574224, 1.113145 },
256 { 12000, 0.331347, 0.337307, 0.000000 },
257 { 14000, 0.355263, 0.289473, -0.333740 },
258 { 16000, 0.371900, 0.256201, -0.628100 }
262 static inline float EqzConvertdB( float db )
265 * (we do as if the input of iir is /EQZ_IN_FACTOR, but in fact it's the non iir data that is *EQZ_IN_FACTOR)
266 * db = 20*log( out / in ) with out = in + amp*iir(i/EQZ_IN_FACTOR)
267 * or iir(i) == i for the center freq so
268 * db = 20*log( 1 + amp/EQZ_IN_FACTOR )
269 * -> amp = EQZ_IN_FACTOR*(10^(db/20) - 1)
276 return EQZ_IN_FACTOR * ( pow( 10, db / 20.0 ) - 1.0 );
279 static int EqzInit( aout_filter_t *p_filter, int i_rate )
281 aout_filter_sys_t *p_sys = p_filter->p_sys;
282 const eqz_config_t *p_cfg;
284 vlc_value_t val1, val2, val3;
285 aout_instance_t *p_aout = (aout_instance_t *)p_filter->p_parent;
287 /* Select the config */
288 if( i_rate == 48000 )
290 p_cfg = &eqz_config_48000_10b;
292 else if( i_rate == 44100 )
294 p_cfg = &eqz_config_44100_10b;
298 /* TODO compute the coeffs on the fly */
299 msg_Err( p_filter, "rate not supported" );
303 /* Create the static filter config */
304 p_sys->i_band = p_cfg->i_band;
305 p_sys->f_alpha = malloc( p_sys->i_band * sizeof(float) );
306 p_sys->f_beta = malloc( p_sys->i_band * sizeof(float) );
307 p_sys->f_gamma = malloc( p_sys->i_band * sizeof(float) );
308 for( i = 0; i < p_sys->i_band; i++ )
310 p_sys->f_alpha[i] = p_cfg->band[i].f_alpha;
311 p_sys->f_beta[i] = p_cfg->band[i].f_beta;
312 p_sys->f_gamma[i] = p_cfg->band[i].f_gamma;
315 /* Filter dyn config */
316 p_sys->b_2eqz = false;
318 p_sys->f_amp = malloc( p_sys->i_band * sizeof(float) );
319 for( i = 0; i < p_sys->i_band; i++ )
321 p_sys->f_amp[i] = 0.0;
325 for( ch = 0; ch < 32; ch++ )
330 p_sys->x2[ch][1] = 0.0;
332 for( i = 0; i < p_sys->i_band; i++ )
336 p_sys->y2[ch][i][0] =
337 p_sys->y2[ch][i][1] = 0.0;
341 char *psz_tmp = var_CreateGetString( p_aout,"equalizer-bands" );
343 psz_tmp = var_CreateGetString( p_aout, "equalizer-preset" );
346 p_sys->b_2eqz = var_CreateGetBool( p_aout, "equalizer-2pass" );
348 var_CreateGetFloat( p_aout, "equalizer-preamp" );
350 /* Get initial values */
351 var_Get( p_aout, "equalizer-preset", &val1 );
352 var_Get( p_aout, "equalizer-bands", &val2 );
353 var_Get( p_aout, "equalizer-preamp", &val3 );
355 p_sys->b_first = true;
356 PresetCallback( VLC_OBJECT( p_aout ), NULL, val1, val1, p_sys );
357 BandsCallback( VLC_OBJECT( p_aout ), NULL, val2, val2, p_sys );
358 PreampCallback( VLC_OBJECT( p_aout ), NULL, val3, val3, p_sys );
359 p_sys->b_first = false;
361 /* Register preset bands (for intf) if : */
362 /* We have no bands info --> the preset info must be given to the intf */
363 /* or The bands info matches the preset */
364 if (p_sys->psz_newbands == NULL)
366 msg_Err(p_filter, "No preset selected");
367 return (VLC_EGENERIC);
369 if( ( *(val2.psz_string) &&
370 strstr( p_sys->psz_newbands, val2.psz_string ) ) || !*val2.psz_string )
372 var_SetString( p_aout, "equalizer-bands", p_sys->psz_newbands );
373 if( p_sys->f_newpreamp == p_sys->f_gamp )
374 var_SetFloat( p_aout, "equalizer-preamp", p_sys->f_newpreamp );
377 /* Add our own callbacks */
378 var_AddCallback( p_aout, "equalizer-preset", PresetCallback, p_sys );
379 var_AddCallback( p_aout, "equalizer-bands", BandsCallback, p_sys );
380 var_AddCallback( p_aout, "equalizer-preamp", PreampCallback, p_sys );
382 msg_Dbg( p_filter, "equalizer loaded for %d Hz with %d bands %d pass",
383 i_rate, p_sys->i_band, p_sys->b_2eqz ? 2 : 1 );
384 for( i = 0; i < p_sys->i_band; i++ )
386 msg_Dbg( p_filter, " %d Hz -> factor:%f alpha:%f beta:%f gamma:%f",
387 (int)p_cfg->band[i].f_frequency, p_sys->f_amp[i],
388 p_sys->f_alpha[i], p_sys->f_beta[i], p_sys->f_gamma[i]);
393 static void EqzFilter( aout_filter_t *p_filter, float *out, float *in,
394 int i_samples, int i_channels )
396 aout_filter_sys_t *p_sys = p_filter->p_sys;
399 for( i = 0; i < i_samples; i++ )
401 for( ch = 0; ch < i_channels; ch++ )
403 const float x = in[ch];
406 for( j = 0; j < p_sys->i_band; j++ )
408 float y = p_sys->f_alpha[j] * ( x - p_sys->x[ch][1] ) +
409 p_sys->f_gamma[j] * p_sys->y[ch][j][0] -
410 p_sys->f_beta[j] * p_sys->y[ch][j][1];
412 p_sys->y[ch][j][1] = p_sys->y[ch][j][0];
413 p_sys->y[ch][j][0] = y;
415 o += y * p_sys->f_amp[j];
417 p_sys->x[ch][1] = p_sys->x[ch][0];
423 const float x2 = EQZ_IN_FACTOR * x + o;
425 for( j = 0; j < p_sys->i_band; j++ )
427 float y = p_sys->f_alpha[j] * ( x2 - p_sys->x2[ch][1] ) +
428 p_sys->f_gamma[j] * p_sys->y2[ch][j][0] -
429 p_sys->f_beta[j] * p_sys->y2[ch][j][1];
431 p_sys->y2[ch][j][1] = p_sys->y2[ch][j][0];
432 p_sys->y2[ch][j][0] = y;
434 o += y * p_sys->f_amp[j];
436 p_sys->x2[ch][1] = p_sys->x2[ch][0];
437 p_sys->x2[ch][0] = x2;
439 /* We add source PCM + filtered PCM */
440 out[ch] = p_sys->f_gamp *( EQZ_IN_FACTOR * x2 + o );
444 /* We add source PCM + filtered PCM */
445 out[ch] = p_sys->f_gamp *( EQZ_IN_FACTOR * x + o );
454 static void EqzClean( aout_filter_t *p_filter )
456 aout_filter_sys_t *p_sys = p_filter->p_sys;
458 var_DelCallback( (aout_instance_t *)p_filter->p_parent,
459 "equalizer-bands", BandsCallback, p_sys );
460 var_DelCallback( (aout_instance_t *)p_filter->p_parent,
461 "equalizer-preset", PresetCallback, p_sys );
462 var_DelCallback( (aout_instance_t *)p_filter->p_parent,
463 "equalizer-preamp", PreampCallback, p_sys );
465 free( p_sys->f_alpha );
466 free( p_sys->f_beta );
467 free( p_sys->f_gamma );
469 free( p_sys->f_amp );
473 static int PresetCallback( vlc_object_t *p_this, char const *psz_cmd,
474 vlc_value_t oldval, vlc_value_t newval, void *p_data )
476 VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
477 aout_filter_sys_t *p_sys = (aout_filter_sys_t *)p_data;
478 aout_instance_t *p_aout = (aout_instance_t *)p_this;
480 char *psz_preset = newval.psz_string;
481 char psz_newbands[120];
483 memset( psz_newbands, 0, 120 );
485 if( *psz_preset && p_sys->i_band == 10 )
489 for( i = 0; eqz_preset_10b[i] != NULL; i++ )
491 if( !strcasecmp( eqz_preset_10b[i]->psz_name, psz_preset ) )
494 p_sys->f_gamp *= pow( 10, eqz_preset_10b[i]->f_preamp / 20.0 );
495 for( j = 0; j < p_sys->i_band; j++ )
498 p_sys->f_amp[j] = EqzConvertdB(
499 eqz_preset_10b[i]->f_amp[j] );
500 div = lldiv( eqz_preset_10b[i]->f_amp[j] * 10000000,
502 sprintf( psz_newbands, "%s %"PRId64".%07u", psz_newbands,
503 (int64_t)div.quot, (unsigned int) div.rem );
505 if( p_sys->b_first == false )
507 var_SetString( p_aout, "equalizer-bands", psz_newbands );
508 var_SetFloat( p_aout, "equalizer-preamp",
509 eqz_preset_10b[i]->f_preamp );
513 p_sys->psz_newbands = strdup( psz_newbands );
514 p_sys->f_newpreamp = eqz_preset_10b[i]->f_preamp;
519 if( eqz_preset_10b[i] == NULL )
521 msg_Err( p_aout, "equalizer preset '%s' not found", psz_preset );
522 msg_Dbg( p_aout, "full list:" );
523 for( i = 0; eqz_preset_10b[i] != NULL; i++ )
524 msg_Dbg( p_aout, " - '%s'", eqz_preset_10b[i]->psz_name );
530 static int PreampCallback( vlc_object_t *p_this, char const *psz_cmd,
531 vlc_value_t oldval, vlc_value_t newval, void *p_data )
533 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
534 aout_filter_sys_t *p_sys = (aout_filter_sys_t *)p_data;
536 if( newval.f_float < -20.0 )
537 newval.f_float = -20.0;
538 else if( newval.f_float > 20.0 )
539 newval.f_float = 20.0;
540 p_sys->f_gamp = pow( 10, newval.f_float /20.0);
545 static int BandsCallback( vlc_object_t *p_this, char const *psz_cmd,
546 vlc_value_t oldval, vlc_value_t newval, void *p_data )
548 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
549 aout_filter_sys_t *p_sys = (aout_filter_sys_t *)p_data;
550 char *psz_bands = newval.psz_string;
555 /* Same thing for bands */
556 for( i = 0; i < p_sys->i_band; i++ )
560 if( *psz_bands == '\0' )
565 f = strtof( p, &psz_next );
567 f = (float)strtod( p, &psz_next );
570 break; /* no conversion */
572 p_sys->f_amp[i] = EqzConvertdB( f );
574 if( *psz_next == '\0' )
575 break; /* end of line */