mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-02-17 03:35:21 +00:00
Code Issues 1 Projects Releases Wiki Activity

audio-resampler: add max-phase-error config

Browse source
This commit is contained in:
Wim Taymans 2016-02-04 15:21:40 +01:00
parent 13e5b986cd
commit 05d238def9
2 changed files with 24 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
gst-libs/gst/audio/audio-resampler.c
View file

@ -148,6 +148,7 @@ static const BlackmanQualityMap blackman_qualities[] = {
#define DEFAULT_QUALITY GST_AUDIO_RESAMPLER_QUALITY_DEFAULT
#define DEFAULT_OPT_CUBIC_B 1.0
#define DEFAULT_OPT_CUBIC_C 0.0
#define DEFAULT_OPT_MAX_PHASE_ERROR 0.05
static gdouble
get_opt_double (GstStructure * options, const gchar * name, gdouble def)
@ -181,6 +182,8 @@ get_opt_int (GstStructure * options, const gchar * name, gint def)
GST_AUDIO_RESAMPLER_OPT_CUBIC_C, DEFAULT_OPT_CUBIC_C)
#define GET_OPT_N_TAPS(options,def) get_opt_int(options, \
GST_AUDIO_RESAMPLER_OPT_N_TAPS, def)
#define GET_OPT_MAX_PHASE_ERROR(options) get_opt_double(options, \
GST_AUDIO_RESAMPLER_OPT_MAX_PHASE_ERROR, DEFAULT_OPT_MAX_PHASE_ERROR)
#include "dbesi0.c"
#define bessel dbesi0
@ -991,6 +994,7 @@ gst_audio_resampler_update (GstAudioResampler * resampler,
gint in_rate, gint out_rate, GstStructure * options)
{
gint gcd, samp_phase, old_n_taps;
gdouble max_error;
g_return_val_if_fail (resampler != NULL, FALSE);
@ -1008,15 +1012,19 @@ gst_audio_resampler_update (GstAudioResampler * resampler,
gcd = gst_util_greatest_common_divisor (in_rate, out_rate);
if (gcd > 1) {
gdouble ph1 = (gdouble) samp_phase / out_rate;
gint factor = 2;
max_error = GET_OPT_MAX_PHASE_ERROR (resampler->options);
/* reduce the factor until we have a phase error of less than 10% */
do {
if (max_error < 1.0e-8) {
gcd = gst_util_greatest_common_divisor (gcd, samp_phase);
} else {
while (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% */
gdouble ph2 = (gdouble) (samp_phase / gcd) / (out_rate / gcd);
if (fabs (ph1 - ph2) < 0.1)
if (fabs (ph1 - ph2) < max_error)
break;
while (gcd % factor != 0)
@ -1024,8 +1032,7 @@ gst_audio_resampler_update (GstAudioResampler * resampler,
gcd /= factor;
GST_INFO ("divide by factor %d, gcd %d", factor, gcd);
} while (gcd > 1);
}
}
GST_INFO ("phase %d, out_rate %d, in_rate %d, gcd %d", samp_phase, out_rate,

9
gst-libs/gst/audio/audio-resampler.h
View file

@ -112,6 +112,15 @@ typedef enum {
*/
#define GST_AUDIO_RESAMPLER_OPT_FILTER_MODE_THRESHOLD "GstAudioResampler.filter-mode-threshold"
/**
* GST_AUDIO_RESAMPLER_OPT_MAX_PHASE_ERROR:
*
* G_TYPE_DOUBLE: The maximum allowed phase error when switching sample
* rates.
* 0.02 is the default.
*/
#define GST_AUDIO_RESAMPLER_OPT_MAX_PHASE_ERROR "GstAudioResampler.max-phase-error"
/**
* GstAudioResamplerMethod:
* @GST_AUDIO_RESAMPLER_METHOD_NEAREST: Duplicates the samples when