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audio-resampler: small cleanups

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This commit is contained in:
Wim Taymans 2016-03-01 16:26:15 +01:00
parent e209c0d565
commit cc9d8594fe
1 changed files with 46 additions and 64 deletions
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110
gst-libs/gst/audio/audio-resampler.c
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@ -249,19 +249,6 @@ get_opt_enum (GstStructure * options, const gchar * name, GType type, gint def)
#include "dbesi0.c"
#define bessel dbesi0
static inline gdouble
get_nearest_tap (gdouble x, gint n_taps)
{
gdouble a = fabs (x), res;;
if (a < 0.5)
res = 1.0;
else
res = 0.0;
return res;
}
static inline gdouble
get_linear_tap (gdouble x, gint n_taps)
{
@ -319,45 +306,6 @@ get_kaiser_tap (gdouble x, gint n_taps, gdouble Fc, gdouble beta)
#define PRECISION_S16 15
#define PRECISION_S32 31
static gdouble
make_taps (GstAudioResampler * resampler,
gdouble * tmp_taps, gdouble x, gint n_taps)
{
gdouble weight = 0.0;
gint i;
switch (resampler->method) {
case GST_AUDIO_RESAMPLER_METHOD_NEAREST:
break;
case GST_AUDIO_RESAMPLER_METHOD_LINEAR:
for (i = 0; i < n_taps; i++)
weight += tmp_taps[i] = get_linear_tap (x + i, resampler->n_taps);
break;
case GST_AUDIO_RESAMPLER_METHOD_CUBIC:
for (i = 0; i < n_taps; i++)
weight += tmp_taps[i] = get_cubic_tap (x + i, resampler->n_taps,
resampler->b, resampler->c);
break;
case GST_AUDIO_RESAMPLER_METHOD_BLACKMAN_NUTTALL:
for (i = 0; i < n_taps; i++)
weight += tmp_taps[i] =
get_blackman_nuttall_tap (x + i,
resampler->n_taps, resampler->cutoff);
break;
case GST_AUDIO_RESAMPLER_METHOD_KAISER:
for (i = 0; i < n_taps; i++)
weight += tmp_taps[i] =
get_kaiser_tap (x + i, resampler->n_taps,
resampler->cutoff, resampler->kaiser_beta);
break;
}
return weight;
}
#define MAKE_CONVERT_TAPS_INT_FUNC(type, precision) \
static void \
convert_taps_##type##_c (gdouble *tmp_taps, gpointer taps, \
@ -428,6 +376,44 @@ static ConvertTapsFunc convert_taps_funcs[] = {
#define convert_taps_gfloat convert_taps_funcs[2]
#define convert_taps_gdouble convert_taps_funcs[3]
static void
make_taps (GstAudioResampler * resampler, gdouble * res, gdouble x, gint n_taps)
{
gdouble weight = 0.0, *tmp_taps = resampler->tmp_taps;
gint i;
switch (resampler->method) {
case GST_AUDIO_RESAMPLER_METHOD_NEAREST:
break;
case GST_AUDIO_RESAMPLER_METHOD_LINEAR:
for (i = 0; i < n_taps; i++)
weight += tmp_taps[i] = get_linear_tap (x + i, resampler->n_taps);
break;
case GST_AUDIO_RESAMPLER_METHOD_CUBIC:
for (i = 0; i < n_taps; i++)
weight += tmp_taps[i] = get_cubic_tap (x + i, resampler->n_taps,
resampler->b, resampler->c);
break;
case GST_AUDIO_RESAMPLER_METHOD_BLACKMAN_NUTTALL:
for (i = 0; i < n_taps; i++)
weight += tmp_taps[i] =
get_blackman_nuttall_tap (x + i,
resampler->n_taps, resampler->cutoff);
break;
case GST_AUDIO_RESAMPLER_METHOD_KAISER:
for (i = 0; i < n_taps; i++)
weight += tmp_taps[i] =
get_kaiser_tap (x + i, resampler->n_taps,
resampler->cutoff, resampler->kaiser_beta);
break;
}
resampler->convert_taps (tmp_taps, res, weight, n_taps);
}
#define MAKE_COEFF_LINEAR_INT_FUNC(type,type2,prec) \
static inline void \
make_coeff_##type##_linear (gint num, gint denom, type *icoeff) \
@ -625,12 +611,11 @@ get_taps_##type##_full (GstAudioResampler * resampler,
switch (resampler->filter_interpolation) { \
case GST_AUDIO_RESAMPLER_FILTER_INTERPOLATION_NONE: \
{ \
gdouble x, weight; \
gdouble x; \
gint n_taps = resampler->n_taps; \
\
x = 1.0 - n_taps / 2 - (gdouble) phase / n_phases; \
weight = make_taps (resampler, resampler->tmp_taps, x, n_taps); \
convert_taps_##type (resampler->tmp_taps, res, weight, n_taps); \
make_taps (resampler, res, x, n_taps); \
break; \
} \
default: \
@ -1157,6 +1142,9 @@ setup_functions (GstAudioResampler * resampler)
else {
switch (resampler->filter_interpolation) {
default:
case GST_AUDIO_RESAMPLER_FILTER_INTERPOLATION_NONE:
fidx = 0;
break;
case GST_AUDIO_RESAMPLER_FILTER_INTERPOLATION_LINEAR:
GST_DEBUG ("using linear interpolation filter function");
fidx = 0;
@ -1307,7 +1295,7 @@ resampler_calculate_taps (GstAudioResampler * resampler)
if (resampler->filter_interpolation !=
GST_AUDIO_RESAMPLER_FILTER_INTERPOLATION_NONE) {
gint i, isize;
gdouble x, weight, *tmp_taps;
gdouble x;
gpointer taps;
switch (resampler->filter_interpolation) {
@ -1324,13 +1312,10 @@ resampler_calculate_taps (GstAudioResampler * resampler)
alloc_taps_mem (resampler, bps, n_taps, oversample + isize);
tmp_taps = resampler->tmp_taps;
for (i = 0; i < oversample + isize; i++) {
x = -(n_taps / 2) + i / (gdouble) oversample;
taps = (gint8 *) resampler->taps + i * resampler->taps_stride;
weight = make_taps (resampler, tmp_taps, x, n_taps);
resampler->convert_taps (tmp_taps, taps, weight, n_taps);
make_taps (resampler, taps, x, n_taps);
}
}
}
@ -1539,10 +1524,7 @@ gst_audio_resampler_new (GstAudioResamplerMethod method,
}
gst_audio_resampler_update (resampler, in_rate, out_rate, options);
/* half of the filter is filled with 0 */
resampler->samp_index = 0;
resampler->samples_avail = resampler->n_taps / 2 - 1;
gst_audio_resampler_reset (resampler);
if (def_options)
gst_structure_free (def_options);