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audiowsincband: Fix range of kernel elements (lim -> lim-1)

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This commit is contained in:
Sebastian Dröge 2011-04-13 18:01:01 +02:00
parent 4fd5fea2b2
commit de7a976531
1 changed files with 11 additions and 7 deletions
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18
gst/audiofx/audiowsincband.c
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@ -272,11 +272,10 @@ gst_audio_wsincband_build_kernel (GstAudioWSincBand * self)
w = 2 * G_PI * (self->lower_frequency / GST_AUDIO_FILTER (self)->format.rate);
kernel_lp = g_new (gdouble, len);
for (i = 0; i < len; ++i) {
if (i == len / 2)
if (i % 2 == 1 && i == (len - 1) / 2)
kernel_lp[i] = w;
else
kernel_lp[i] = sin (w * (i - len / 2))
/ (i - len / 2);
kernel_lp[i] = sin (w * (i - (len - 1) / 2)) / (i - (len - 1) / 2);
/* windowing */
switch (self->window) {
@ -310,11 +309,11 @@ gst_audio_wsincband_build_kernel (GstAudioWSincBand * self)
w = 2 * G_PI * (self->upper_frequency / GST_AUDIO_FILTER (self)->format.rate);
kernel_hp = g_new (gdouble, len);
for (i = 0; i < len; ++i) {
if (i == len / 2)
if (i % 2 == 1 && i == (len - 1) / 2)
kernel_hp[i] = w;
else
kernel_hp[i] = sin (w * (i - len / 2))
/ (i - len / 2);
kernel_hp[i] = sin (w * (i - (len - 1) / 2)) / (i - (len - 1) / 2);
/* Windowing */
switch (self->window) {
case WINDOW_HAMMING:
@ -346,7 +345,12 @@ gst_audio_wsincband_build_kernel (GstAudioWSincBand * self)
/* do spectral inversion to go from lowpass to highpass */
for (i = 0; i < len; ++i)
kernel_hp[i] = -kernel_hp[i];
kernel_hp[len / 2] += 1;
if (len % 2 == 1) {
kernel_hp[(len - 1) / 2] += 1.0;
} else {
kernel_hp[len / 2 - 1] += 0.5;
kernel_hp[len / 2] += 0.5;
}
/* combine the two kernels */
kernel = g_new (gdouble, len);