diff options
Diffstat (limited to 'gst/equalizer/gstiirequalizer.c')
| -rw-r--r-- | gst/equalizer/gstiirequalizer.c | 39 |
1 files changed, 27 insertions, 12 deletions
diff --git a/gst/equalizer/gstiirequalizer.c b/gst/equalizer/gstiirequalizer.c index 8c87a664..25ee6972 100644 --- a/gst/equalizer/gstiirequalizer.c +++ b/gst/equalizer/gstiirequalizer.c @@ -1,6 +1,7 @@ /* GStreamer * Copyright (C) <2004> Benjamin Otte <otte@gnome.org> * <2007> Stefan Kost <ensonic@users.sf.net> + * <2007> Sebastian Dröge <slomo@circular-chaos.org> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public @@ -33,7 +34,6 @@ GST_DEBUG_CATEGORY (equalizer_debug); #define GST_CAT_DEFAULT equalizer_debug - static void gst_iir_equalizer_child_proxy_interface_init (gpointer g_iface, gpointer iface_data); @@ -376,17 +376,32 @@ setup_filter (GstIirEqualizer * equ, GstIirEqualizerBand * band) * - we need shelf-filter for 1st and last band */ { - gdouble gain = arg_to_scale (band->gain); - gdouble frequency = band->freq / GST_AUDIO_FILTER (equ)->format.rate; - gdouble omega = 2.0 * M_PI * frequency; - gdouble bw = - 2.0 * M_PI * (band->width / GST_AUDIO_FILTER (equ)->format.rate); + gdouble gain, omega, bw; + gdouble edge_gain, gamma; + gdouble alpha, beta; + + + gain = arg_to_scale (band->gain); + + if (band->freq / GST_AUDIO_FILTER (equ)->format.rate > 0.5) + omega = M_PI; + else if (band->freq < 0.0) + omega = 0.0; + else + omega = 2.0 * M_PI * (band->freq / GST_AUDIO_FILTER (equ)->format.rate); + + if (band->width / GST_AUDIO_FILTER (equ)->format.rate > 0.5) + bw = M_PI; + else if (band->width <= 1.0) + bw = 2.0 * M_PI * (1.0 / GST_AUDIO_FILTER (equ)->format.rate); + else + bw = 2.0 * M_PI * (band->width / GST_AUDIO_FILTER (equ)->format.rate); - gdouble edge_gain = sqrt (gain); - gdouble gamma = tan (bw / 2.0); + edge_gain = sqrt (gain); + gamma = tan (bw / 2.0); - gdouble alpha = gamma * edge_gain; - gdouble beta = gamma / edge_gain; + alpha = gamma * edge_gain; + beta = gamma / edge_gain; band->a0 = (1.0 + alpha) / (1.0 + beta); band->a1 = (-2.0 * cos (omega)) / (1.0 + beta); @@ -396,8 +411,8 @@ setup_filter (GstIirEqualizer * equ, GstIirEqualizerBand * band) GST_INFO ("gain = %7.5g, , bandwidth= %7.5g, frequency = %7.5g, a0 = %7.5g, a1 = %7.5g, a2=%7.5g b1 = %7.5g, b2 = %7.5g", - gain, band->width, frequency, band->a0, band->a1, band->a2, band->b1, - band->b2); + band->gain, band->width, band->freq, band->a0, band->a1, band->a2, + band->b1, band->b2); } } |