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swresample: allow double precision beta value for the Kaiser window

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Kaiser windows inherently don't require beta to be an integer. This was
an arbitrary restriction. Moreover, soxr does not require it, and in
fact often estimates beta to a non-integral value.

Thus, this patch allows greater flexibility for swresample clients.
Micro version is updated.

Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-11-07 10:16:27 -05:00
parent 9ac61e73d0
commit 1bed09a30e
7 changed files with 9 additions and 9 deletions
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2
doc/resampler.texi
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@ -220,7 +220,7 @@ select Kaiser windowed sinc
@end table
@item kaiser_beta
For swr only, set Kaiser window beta value. Must be an integer in the
For swr only, set Kaiser window beta value. Must be a double float value in the
interval [2,16], default value is 9.
@item output_sample_bits

2
libswresample/options.c
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@ -120,7 +120,7 @@ static const AVOption options[]={
{ "blackman_nuttall", "select Blackman Nuttall windowed sinc", 0 , AV_OPT_TYPE_CONST, { .i64 = SWR_FILTER_TYPE_BLACKMAN_NUTTALL }, INT_MIN, INT_MAX, PARAM, "filter_type" },
{ "kaiser" , "select Kaiser windowed sinc" , 0 , AV_OPT_TYPE_CONST, { .i64 = SWR_FILTER_TYPE_KAISER }, INT_MIN, INT_MAX, PARAM, "filter_type" },
{ "kaiser_beta" , "set swr Kaiser window beta" , OFFSET(kaiser_beta) , AV_OPT_TYPE_INT , {.i64=9 }, 2 , 16 , PARAM },
{ "kaiser_beta" , "set swr Kaiser window beta" , OFFSET(kaiser_beta) , AV_OPT_TYPE_DOUBLE , {.dbl=9 }, 2 , 16 , PARAM },
{ "output_sample_bits" , "set swr number of output sample bits", OFFSET(dither.output_sample_bits), AV_OPT_TYPE_INT , {.i64=0 }, 0 , 64 , PARAM },
{0}

4
libswresample/resample.c
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@ -71,7 +71,7 @@ static double bessel(double x){
* @return 0 on success, negative on error
*/
static int build_filter(ResampleContext *c, void *filter, double factor, int tap_count, int alloc, int phase_count, int scale,
int filter_type, int kaiser_beta){
int filter_type, double kaiser_beta){
int ph, i;
double x, y, w, t;
double *tab = av_malloc_array(tap_count+1, sizeof(*tab));
@ -212,7 +212,7 @@ static int build_filter(ResampleContext *c, void *filter, double factor, int tap
}
static ResampleContext *resample_init(ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear,
double cutoff0, enum AVSampleFormat format, enum SwrFilterType filter_type, int kaiser_beta,
double cutoff0, enum AVSampleFormat format, enum SwrFilterType filter_type, double kaiser_beta,
double precision, int cheby)
{
double cutoff = cutoff0? cutoff0 : 0.97;

2
libswresample/resample.h
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@ -44,7 +44,7 @@ typedef struct ResampleContext {
int phase_mask;
int linear;
enum SwrFilterType filter_type;
int kaiser_beta;
double kaiser_beta;
double factor;
enum AVSampleFormat format;
int felem_size;

2
libswresample/soxr_resample.c
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@ -30,7 +30,7 @@
#include <soxr.h>
static struct ResampleContext *create(struct ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear,
double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, int kaiser_beta, double precision, int cheby){
double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, double kaiser_beta, double precision, int cheby){
soxr_error_t error;
soxr_datatype_t type =

4
libswresample/swresample_internal.h
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@ -69,7 +69,7 @@ struct DitherContext {
};
typedef struct ResampleContext * (* resample_init_func)(struct ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear,
double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, int kaiser_beta, double precision, int cheby);
double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, double kaiser_beta, double precision, int cheby);
typedef void (* resample_free_func)(struct ResampleContext **c);
typedef int (* multiple_resample_func)(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
typedef int (* resample_flush_func)(struct SwrContext *c);
@ -128,7 +128,7 @@ struct SwrContext {
int linear_interp; /**< if 1 then the resampling FIR filter will be linearly interpolated */
double cutoff; /**< resampling cutoff frequency (swr: 6dB point; soxr: 0dB point). 1.0 corresponds to half the output sample rate */
int filter_type; /**< swr resampling filter type */
int kaiser_beta; /**< swr beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER) */
double kaiser_beta; /**< swr beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER) */
double precision; /**< soxr resampling precision (in bits) */
int cheby; /**< soxr: if 1 then passband rolloff will be none (Chebyshev) & irrational ratio approximation precision will be higher */

2
libswresample/version.h
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@ -30,7 +30,7 @@
#define LIBSWRESAMPLE_VERSION_MAJOR 2
#define LIBSWRESAMPLE_VERSION_MINOR 0
#define LIBSWRESAMPLE_VERSION_MICRO 100
#define LIBSWRESAMPLE_VERSION_MICRO 101
#define LIBSWRESAMPLE_VERSION_INT AV_VERSION_INT(LIBSWRESAMPLE_VERSION_MAJOR, \
LIBSWRESAMPLE_VERSION_MINOR, \