/*****************************************************************************
* equalizer.c:
*****************************************************************************
- * Copyright (C) 2004-2009 the VideoLAN team
+ * Copyright (C) 2004-2012 the VideoLAN team
* $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
#include <vlc_filter.h>
#include "equalizer_presets.h"
+
/* TODO:
- * - add tables for other rates ( 22500, 11250, ...)
* - optimize a bit (you can hardly do slower ;)
* - add tables for more bands (15 and 32 would be cool), maybe with auto coeffs
- * computation (not too hard once the Q is found).
+ * computation (not too hard once the Q is found).
* - support for external preset
* - callback to handle preset changes on the fly
* - ...
"provide 10 values between -20dB and 20dB, separated by spaces, " \
"e.g. \"0 2 4 2 0 -2 -4 -2 0 2\"." )
+#define VLC_BANDS_TEXT N_( "Use VLC frequency bands" )
+#define VLC_BANDS_LONGTEXT N_( \
+ "Use the VLC frequency bands. Otherwise, use the ISO Standard " \
+ "frequency bands." )
+
#define TWOPASS_TEXT N_( "Two pass" )
#define TWOPASS_LONGTEXT N_( "Filter the audio twice. This provides a more " \
"intense effect.")
add_string( "equalizer-preset", "flat", PRESET_TEXT,
PRESET_LONGTEXT, false )
- change_string_list( preset_list, preset_list_text, 0 )
+ change_string_list( preset_list, preset_list_text )
add_string( "equalizer-bands", NULL, BANDS_TEXT,
BANDS_LONGTEXT, true )
- add_bool( "equalizer-2pass", false, NULL, TWOPASS_TEXT,
+ add_bool( "equalizer-2pass", false, TWOPASS_TEXT,
TWOPASS_LONGTEXT, true )
- add_float( "equalizer-preamp", 12.0, NULL, PREAMP_TEXT,
+ add_bool( "equalizer-vlcfreqs", true, VLC_BANDS_TEXT,
+ VLC_BANDS_LONGTEXT, true )
+ add_float( "equalizer-preamp", 12.0, PREAMP_TEXT,
PREAMP_LONGTEXT, true )
set_callbacks( Open, Close )
add_shortcut( "equalizer" )
static int Open( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
- filter_sys_t *p_sys;
-
- if( p_filter->fmt_in.audio.i_format != VLC_CODEC_FL32 ||
- p_filter->fmt_out.audio.i_format != VLC_CODEC_FL32 )
- {
- p_filter->fmt_in.audio.i_format = VLC_CODEC_FL32;
- p_filter->fmt_out.audio.i_format = VLC_CODEC_FL32;
- msg_Warn( p_filter, "bad input or output format" );
- return VLC_EGENERIC;
- }
- if ( !AOUT_FMTS_SIMILAR( &p_filter->fmt_in.audio, &p_filter->fmt_out.audio ) )
- {
- memcpy( &p_filter->fmt_out.audio, &p_filter->fmt_in.audio,
- sizeof(audio_sample_format_t) );
- msg_Warn( p_filter, "input and output formats are not similar" );
- return VLC_EGENERIC;
- }
-
- p_filter->pf_audio_filter = DoWork;
/* Allocate structure */
- p_sys = p_filter->p_sys = malloc( sizeof( *p_sys ) );
+ filter_sys_t *p_sys = p_filter->p_sys = malloc( sizeof( *p_sys ) );
if( !p_sys )
return VLC_ENOMEM;
return VLC_EGENERIC;
}
+ p_filter->fmt_in.audio.i_format = VLC_CODEC_FL32;
+ p_filter->fmt_out.audio = p_filter->fmt_in.audio;
+ p_filter->pf_audio_filter = DoWork;
+
return VLC_SUCCESS;
}
} eqz_config_t;
-/* Value from equ-xmms */
-static const eqz_config_t eqz_config_44100_10b =
+/* The frequency tables */
+static const float f_vlc_frequency_table_10b[EQZ_BANDS_MAX] =
{
- 10,
- {
- { 60, 0.003013, 0.993973, 1.993901 },
- { 170, 0.008490, 0.983019, 1.982437 },
- { 310, 0.015374, 0.969252, 1.967331 },
- { 600, 0.029328, 0.941343, 1.934254 },
- { 1000, 0.047918, 0.904163, 1.884869 },
- { 3000, 0.130408, 0.739184, 1.582718 },
- { 6000, 0.226555, 0.546889, 1.015267 },
- { 12000, 0.344937, 0.310127, -0.181410 },
- { 14000, 0.366438, 0.267123, -0.521151 },
- { 16000, 0.379009, 0.241981, -0.808451 },
- }
+ 60, 170, 310, 600, 1000, 3000, 6000, 12000, 14000, 16000,
+};
+
+static const float f_iso_frequency_table_10b[EQZ_BANDS_MAX] =
+{
+ 31.25, 62.5, 125, 250, 500, 1000, 2000, 4000, 8000, 16000,
};
-static const eqz_config_t eqz_config_48000_10b =
+
+/* Equalizer coefficient calculation function based on equ-xmms */
+static void EqzCoeffs( int i_rate, float f_octave_percent,
+ bool b_use_vlc_freqs,
+ eqz_config_t *p_eqz_config )
{
- 10,
+ const float *f_freq_table_10b = b_use_vlc_freqs
+ ? f_vlc_frequency_table_10b
+ : f_iso_frequency_table_10b;
+ float f_rate = (float) i_rate;
+ float f_nyquist_freq = 0.5 * f_rate;
+ float f_octave_factor = pow( 2.0, 0.5 * f_octave_percent );
+ float f_octave_factor_1 = 0.5 * ( f_octave_factor + 1.0 );
+ float f_octave_factor_2 = 0.5 * ( f_octave_factor - 1.0 );
+
+ p_eqz_config->i_band = EQZ_BANDS_MAX;
+
+ for( int i = 0; i < EQZ_BANDS_MAX; i++ )
{
- { 60, 0.002769, 0.994462, 1.994400 },
- { 170, 0.007806, 0.984388, 1.983897 },
- { 310, 0.014143, 0.971714, 1.970091 },
- { 600, 0.027011, 0.945978, 1.939979 },
- { 1000, 0.044203, 0.911595, 1.895241 },
- { 3000, 0.121223, 0.757553, 1.623767 },
- { 6000, 0.212888, 0.574224, 1.113145 },
- { 12000, 0.331347, 0.337307, 0.000000 },
- { 14000, 0.355263, 0.289473, -0.333740 },
- { 16000, 0.371900, 0.256201, -0.628100 }
+ float f_freq = f_freq_table_10b[i];
+
+ p_eqz_config->band[i].f_frequency = f_freq;
+
+ if( f_freq <= f_nyquist_freq )
+ {
+ float f_theta_1 = ( 2.0 * M_PI * f_freq ) / f_rate;
+ float f_theta_2 = f_theta_1 / f_octave_factor;
+ float f_sin = sin( f_theta_2 ) * 0.5;
+ float f_sin_prd = sin( f_theta_2 * f_octave_factor_1 )
+ * sin( f_theta_2 * f_octave_factor_2 );
+ /* The equation from equ-xmms simplifies to something similar to
+ * this when you restrict the domain to all valid frequencies at or
+ * below the Nyquist frequency (the interval 0 <= f_theta_1 <= Pi).
+ * (This result for the root is twice that returned by equ-xmms,
+ * but the more efficient calculations for alpha, beta, and gamma
+ * below compensate for this.) */
+ float f_root = ( f_sin - f_sin_prd ) / ( f_sin + f_sin_prd );
+
+ p_eqz_config->band[i].f_alpha = ( 1.0 - f_root ) * 0.5;
+ p_eqz_config->band[i].f_beta = f_root;
+ p_eqz_config->band[i].f_gamma = ( 1.0 + f_root ) * cos( f_theta_1 );
+ }
+ else
+ {
+ /* Any frequency beyond the Nyquist frequency is no good... */
+ p_eqz_config->band[i].f_alpha =
+ p_eqz_config->band[i].f_beta =
+ p_eqz_config->band[i].f_gamma = 0.0;
+ }
}
-};
+}
static inline float EqzConvertdB( float db )
{
static int EqzInit( filter_t *p_filter, int i_rate )
{
filter_sys_t *p_sys = p_filter->p_sys;
- const eqz_config_t *p_cfg;
+ eqz_config_t cfg;
int i, ch;
vlc_value_t val1, val2, val3;
vlc_object_t *p_aout = p_filter->p_parent;
int i_ret = VLC_ENOMEM;
- /* Select the config */
- if( i_rate == 48000 )
- {
- p_cfg = &eqz_config_48000_10b;
- }
- else if( i_rate == 44100 )
- {
- p_cfg = &eqz_config_44100_10b;
- }
- else
- {
- /* TODO compute the coeffs on the fly */
- msg_Err( p_filter, "rate not supported" );
- return VLC_EGENERIC;
- }
+ bool b_vlcFreqs = var_InheritBool( p_aout, "equalizer-vlcfreqs" );
+ EqzCoeffs( i_rate, 1.0, b_vlcFreqs, &cfg );
/* Create the static filter config */
- p_sys->i_band = p_cfg->i_band;
+ p_sys->i_band = cfg.i_band;
p_sys->f_alpha = malloc( p_sys->i_band * sizeof(float) );
p_sys->f_beta = malloc( p_sys->i_band * sizeof(float) );
p_sys->f_gamma = malloc( p_sys->i_band * sizeof(float) );
for( i = 0; i < p_sys->i_band; i++ )
{
- p_sys->f_alpha[i] = p_cfg->band[i].f_alpha;
- p_sys->f_beta[i] = p_cfg->band[i].f_beta;
- p_sys->f_gamma[i] = p_cfg->band[i].f_gamma;
+ p_sys->f_alpha[i] = cfg.band[i].f_alpha;
+ p_sys->f_beta[i] = cfg.band[i].f_beta;
+ p_sys->f_gamma[i] = cfg.band[i].f_gamma;
}
/* Filter dyn config */
for( i = 0; i < p_sys->i_band; i++ )
{
msg_Dbg( p_filter, " %d Hz -> factor:%f alpha:%f beta:%f gamma:%f",
- (int)p_cfg->band[i].f_frequency, p_sys->f_amp[i],
+ (int)cfg.band[i].f_frequency, p_sys->f_amp[i],
p_sys->f_alpha[i], p_sys->f_beta[i], p_sys->f_gamma[i]);
}
return VLC_SUCCESS;
return VLC_SUCCESS;
}
- for( unsigned i = 0; eqz_preset_10b[i] != NULL; i++ )
+ for( unsigned i = 0; i < NB_PRESETS; i++ )
{
- if( !strcasecmp( eqz_preset_10b[i]->psz_name, psz_preset ) )
+ if( !strcasecmp( eqz_preset_10b[i].psz_name, psz_preset ) )
{
char *psz_newbands = NULL;
- p_sys->f_gamp *= pow( 10, eqz_preset_10b[i]->f_preamp / 20.0 );
+ p_sys->f_gamp *= pow( 10, eqz_preset_10b[i].f_preamp / 20.0 );
for( int j = 0; j < p_sys->i_band; j++ )
{
lldiv_t d;
char *psz;
- p_sys->f_amp[j] = EqzConvertdB( eqz_preset_10b[i]->f_amp[j] );
- d = lldiv( eqz_preset_10b[i]->f_amp[j] * 10000000, 10000000 );
+ p_sys->f_amp[j] = EqzConvertdB( eqz_preset_10b[i].f_amp[j] );
+ d = lldiv( eqz_preset_10b[i].f_amp[j] * 10000000, 10000000 );
if( asprintf( &psz, "%s %lld.%07llu",
psz_newbands ? psz_newbands : "",
d.quot, d.rem ) == -1 )
free( psz_newbands );
psz_newbands = psz;
}
- if( p_sys->b_first == false )
+ if( !p_sys->b_first )
{
vlc_mutex_unlock( &p_sys->lock );
var_SetString( p_aout, "equalizer-bands", psz_newbands );
var_SetFloat( p_aout, "equalizer-preamp",
- eqz_preset_10b[i]->f_preamp );
+ eqz_preset_10b[i].f_preamp );
free( psz_newbands );
}
else
{
p_sys->psz_newbands = psz_newbands;
- p_sys->f_newpreamp = eqz_preset_10b[i]->f_preamp;
+ p_sys->f_newpreamp = eqz_preset_10b[i].f_preamp;
vlc_mutex_unlock( &p_sys->lock );
}
return VLC_SUCCESS;
vlc_mutex_unlock( &p_sys->lock );
msg_Err( p_aout, "equalizer preset '%s' not found", psz_preset );
msg_Info( p_aout, "full list:" );
- for( unsigned i = 0; eqz_preset_10b[i] != NULL; i++ )
- msg_Info( p_aout, " - '%s'", eqz_preset_10b[i]->psz_name );
+ for( unsigned i = 0; i < NB_PRESETS; i++ )
+ msg_Info( p_aout, " - '%s'", eqz_preset_10b[i].psz_name );
return VLC_SUCCESS;
}
projects / vlc / blobdiff