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resample: update params by name

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Make the params introspectable, use the names to configure them in
audioconvert.

Only use precomputed filters when using the defaults.

Tweak the kaiser filter alpha and n_taps based on values calculated from
stopband attenuation and transition bandwidth.
This commit is contained in:
Wim Taymans 2025-11-20 12:33:14 +01:00
parent bfd26c98e3
commit e8268969ea
3 changed files with 122 additions and 97 deletions
Download patch file Download diff file Expand all files Collapse all files

54
spa/plugins/audioconvert/resample.h
View file

@ -9,31 +9,24 @@
#include <spa/support/log.h>
#define RESAMPLE_DEFAULT_QUALITY 4
#define RESAMPLE_MAX_PARAMS 16
struct resample_config {
#define RESAMPLE_WINDOW_DEFAULT 0
#define RESAMPLE_WINDOW_EXP 1
#define RESAMPLE_WINDOW_BLACKMAN 2
#define RESAMPLE_WINDOW_KAISER 3
#define RESAMPLE_WINDOW_EXP 0
#define RESAMPLE_WINDOW_BLACKMAN 1
#define RESAMPLE_WINDOW_KAISER 2
uint32_t window;
uint32_t n_taps;
double cutoff;
uint32_t n_taps;
union {
double params[32];
struct {
double A;
} exp_params;
struct {
double alpha;
} blackman_params;
struct {
double stopband_attenuation;
double transition_bandwidth;
double alpha;
} kaiser_params;
};
#define RESAMPLE_PARAM_EXP_A 0
#define RESAMPLE_PARAM_BLACKMAN_ALPHA 0
#define RESAMPLE_PARAM_KAISER_ALPHA 0
#define RESAMPLE_PARAM_KAISER_SB_ATT 1 /* stopband attenuation */
#define RESAMPLE_PARAM_KAISER_TR_BW 2 /* transition bandwidth */
#define RESAMPLE_PARAM_INVALID (RESAMPLE_MAX_PARAMS-1)
double params[RESAMPLE_MAX_PARAMS];
};
struct resample {
@ -49,7 +42,7 @@ struct resample {
double rate;
int quality;
struct resample_config config;
struct resample_config config; /* set to all 0 for defaults */
void (*free) (struct resample *r);
void (*update_rate) (struct resample *r, double rate);
@ -85,8 +78,6 @@ static const struct resample_window_info {
const char *label;
const char *description;
} resample_window_info[] = {
[RESAMPLE_WINDOW_DEFAULT] = { RESAMPLE_WINDOW_DEFAULT,
"default", "Default window", },
[RESAMPLE_WINDOW_EXP] = { RESAMPLE_WINDOW_EXP,
"exponential", "Exponential window", },
[RESAMPLE_WINDOW_BLACKMAN] = { RESAMPLE_WINDOW_BLACKMAN,
@ -104,5 +95,24 @@ static inline uint32_t resample_window_from_label(const char *label)
return RESAMPLE_WINDOW_EXP;
}
static const struct resample_param_info {
uint32_t idx;
const char *label;
} resample_param_info[] = {
{ RESAMPLE_PARAM_EXP_A, "exp.A" },
{ RESAMPLE_PARAM_BLACKMAN_ALPHA, "blackman.alpha" },
{ RESAMPLE_PARAM_KAISER_ALPHA, "kaiser.alpha" },
{ RESAMPLE_PARAM_KAISER_SB_ATT, "kaiser.stopband-attenuation" },
{ RESAMPLE_PARAM_KAISER_TR_BW, "kaiser.transition-bandwidth" },
};
static inline uint32_t resample_param_from_label(const char *label)
{
SPA_FOR_EACH_ELEMENT_VAR(resample_param_info, i) {
if (spa_streq(i->label, label))
return i->idx;
}
return RESAMPLE_PARAM_INVALID;
}
#endif /* RESAMPLE_H */