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audio-resampler: improve phase error

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Accept a phase error of maximum 10%, which turns out to be inaudible.
This commit is contained in:
Wim Taymans 2016-02-02 11:48:16 +01:00
parent b0b3350717
commit 45574ba4f4
1 changed files with 19 additions and 6 deletions
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25
gst-libs/gst/audio/audio-resampler.c
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@ -984,8 +984,7 @@ gboolean
gst_audio_resampler_update (GstAudioResampler * resampler,
guint in_rate, guint out_rate, GstStructure * options)
{
gint gcd, samp_phase;
gint old_n_taps;
gint gcd, samp_phase, old_n_taps;
g_return_val_if_fail (resampler != NULL, FALSE);
@ -1002,10 +1001,23 @@ gst_audio_resampler_update (GstAudioResampler * resampler,
samp_phase = 0;
gcd = gst_util_greatest_common_divisor (in_rate, out_rate);
/* make sure we have exactly the same phase in the new sample rate.
* FIXME we might want to relax this and get a phase that is within
* a certain error */
gcd = gst_util_greatest_common_divisor (samp_phase, gcd);
if (gcd > 1) {
gdouble ph1 = (gdouble) samp_phase / out_rate;
gint factor = 2;
/* reduce the factor until we have a phase error of less than 10% */
do {
gdouble ph2 = (gdouble) (samp_phase / gcd) / (out_rate / gcd);
if (fabs (ph1 - ph2) < 0.1)
break;
while (gcd % factor != 0)
factor++;
gcd /= factor;
} while (gcd > 1);
}
GST_INFO ("phase %d, out_rate %d, in_rate %d, gcd %d", samp_phase, out_rate,
in_rate, gcd);
@ -1013,6 +1025,7 @@ gst_audio_resampler_update (GstAudioResampler * resampler,
resampler->samp_phase = samp_phase / gcd;
resampler->in_rate = in_rate / gcd;
resampler->out_rate = out_rate / gcd;
if (options) {
if (resampler->options)
gst_structure_free (resampler->options);