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resample: update params by name

Browse source 
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

17
spa/plugins/audioconvert/audioconvert.c
View file

@ -100,7 +100,7 @@ struct props {
unsigned int mix_disabled:1;
unsigned int resample_disabled:1;
unsigned int resample_quality;
uint32_t resample_window;
struct resample_config resample_config;
double rate;
char wav_path[512];
unsigned int lock_volumes:1;
@ -123,7 +123,7 @@ static void props_reset(struct props *props)
props->mix_disabled = false;
props->resample_disabled = false;
props->resample_quality = RESAMPLE_DEFAULT_QUALITY;
props->resample_window = RESAMPLE_WINDOW_DEFAULT;
spa_zero(props->resample_config);
props->rate = 1.0;
spa_zero(props->wav_path);
props->lock_volumes = false;
@ -1481,7 +1481,15 @@ static int audioconvert_set_param(struct impl *this, const char *k, const char *
else if (spa_streq(k, "resample.disable"))
this->props.resample_disabled = spa_atob(s);
else if (spa_streq(k, "resample.window"))
this->props.resample_window = resample_window_from_label(s);
this->props.resample_config.window = resample_window_from_label(s);
else if (spa_streq(k, "resample.cutoff"))
spa_atod(s, &this->props.resample_config.cutoff);
else if (spa_streq(k, "resample.n-taps"))
spa_atou32(s, &this->props.resample_config.n_taps, 0);
else if (spa_strstartswith(k, "resample.param.")) {
uint32_t idx = resample_param_from_label(k+strlen("resample.param."));
spa_atod(s, &this->props.resample_config.params[idx]);
}
else if (spa_streq(k, "dither.noise"))
spa_atou32(s, &this->dir[1].conv.noise_bits, 0);
else if (spa_streq(k, "dither.method"))
@ -2293,8 +2301,7 @@ static int setup_resample(struct impl *this)
this->resample.o_rate = out->format.info.raw.rate;
this->resample.log = this->log;
this->resample.quality = this->props.resample_quality;
spa_zero(this->resample.config);
this->resample.config.window = this->props.resample_window;
this->resample.config = this->props.resample_config;
this->resample.cpu_flags = this->cpu_flags;
this->rate_adjust = this->props.rate != 1.0;

144
spa/plugins/audioconvert/resample-native.c
View file

@ -15,9 +15,9 @@ SPA_LOG_TOPIC_DEFINE(resample_log_topic, "spa.resample");
struct quality {
uint32_t n_taps;
double cutoff; /* when upsampling */
double cutoff_factor; /* factor for downsampling */
double params[32];
double cutoff_up; /* when upsampling */
double cutoff_down; /* for downsampling */
double params[RESAMPLE_MAX_PARAMS];
};
struct window_info {
@ -30,26 +30,26 @@ struct window_info {
struct window_info window_info[];
static const struct quality blackman_qualities[] = {
{ 8, 0.53, 1.0, { 0.16, }},
{ 16, 0.67, 1.0, { 0.20, }},
{ 24, 0.75, 1.0, { 0.16, }},
{ 32, 0.80, 1.0, { 0.16, }},
{ 48, 0.85, 1.0, { 0.16, }}, /* default */
{ 64, 0.88, 1.0, { 0.16, }},
{ 80, 0.895, 1.0, { 0.16, }},
{ 96, 0.910, 1.0, { 0.16, }},
{ 128, 0.936, 1.0, { 0.16, }},
{ 144, 0.945, 1.0, { 0.16, }},
{ 160, 0.950, 1.0, { 0.16, }},
{ 192, 0.960, 1.0, { 0.16, }},
{ 256, 0.970, 1.0, { 0.16, }},
{ 896, 0.990, 1.0, { 0.16, }},
{ 1024, 0.995, 1.0, { 0.16, }},
{ 8, 0.53, 0.53, { 0.16, }},
{ 16, 0.67, 0.67, { 0.20, }},
{ 24, 0.75, 0.75, { 0.16, }},
{ 32, 0.80, 0.80, { 0.16, }},
{ 48, 0.85, 0.85, { 0.16, }}, /* default */
{ 64, 0.88, 0.88, { 0.16, }},
{ 80, 0.895, 0.895, { 0.16, }},
{ 96, 0.910, 0.910, { 0.16, }},
{ 128, 0.936, 0.936, { 0.16, }},
{ 144, 0.945, 0.945, { 0.16, }},
{ 160, 0.950, 0.950, { 0.16, }},
{ 192, 0.960, 0.960, { 0.16, }},
{ 256, 0.970, 0.970, { 0.16, }},
{ 896, 0.990, 0.990, { 0.16, }},
{ 1024, 0.995, 0.995, { 0.16, }},
};
static inline void blackman_window(struct resample *r, double *w, double t, uint32_t n_taps)
{
double x, alpha = r->config.blackman_params.alpha;
double x, alpha = r->config.params[RESAMPLE_PARAM_BLACKMAN_ALPHA];
uint32_t i, n_taps12 = n_taps/2;
for (i = 0; i < n_taps12; i++, t += 1.0) {
x = 2.0 * M_PI * t / n_taps;
@ -60,31 +60,32 @@ static inline void blackman_window(struct resample *r, double *w, double t, uint
static inline void blackman_config(struct resample *r)
{
const struct quality *q = &window_info[r->config.window].qualities[r->quality];
if (r->config.blackman_params.alpha == 0.0)
r->config.blackman_params.alpha = q->params[0];
const uint32_t p0 = RESAMPLE_PARAM_BLACKMAN_ALPHA;
if (r->config.params[p0] == 0.0)
r->config.params[p0] = q->params[p0];
}
static const struct quality exp_qualities[] = {
{ 8, 0.53, 1.0, { 16.97789, }},
{ 16, 0.67, 1.0, { 16.97789, }},
{ 24, 0.75, 1.0, { 16.97789, }},
{ 32, 0.80, 1.0, { 16.97789, }},
{ 48, 0.85, 1.0, { 16.97789, }}, /* default */
{ 64, 0.88, 1.0, { 16.97789, }},
{ 80, 0.895, 1.0, { 16.97789, }},
{ 96, 0.910, 1.0, { 16.97789, }},
{ 128, 0.936, 1.0, { 16.97789, }},
{ 144, 0.945, 1.0, { 16.97789, }},
{ 160, 0.950, 1.0, { 16.97789, }},
{ 192, 0.960, 1.0, { 16.97789, }},
{ 256, 0.970, 1.0, { 16.97789, }},
{ 896, 0.990, 1.0, { 16.97789, }},
{ 1024, 0.995, 1.0, { 16.97789, }},
{ 8, 0.53, 0.53, { 16.97789, }},
{ 16, 0.67, 0.67, { 16.97789, }},
{ 24, 0.75, 0.75, { 16.97789, }},
{ 32, 0.80, 0.80, { 16.97789, }},
{ 48, 0.85, 0.85, { 16.97789, }}, /* default */
{ 64, 0.88, 0.88, { 16.97789, }},
{ 80, 0.895, 0.895, { 16.97789, }},
{ 96, 0.910, 0.910, { 16.97789, }},
{ 128, 0.936, 0.936, { 16.97789, }},
{ 144, 0.945, 0.945, { 16.97789, }},
{ 160, 0.950, 0.950, { 16.97789, }},
{ 192, 0.960, 0.960, { 16.97789, }},
{ 256, 0.970, 0.970, { 16.97789, }},
{ 896, 0.990, 0.990, { 16.97789, }},
{ 1024, 0.995, 0.995, { 16.97789, }},
};
static inline void exp_window(struct resample *r, double *w, double t, uint32_t n_taps)
{
double x, A = r->config.exp_params.A;
double x, A = r->config.params[RESAMPLE_PARAM_EXP_A];
uint32_t i, n_taps12 = n_taps/2;
for (i = 0; i < n_taps12; i++, t += 1.0) {
@ -96,33 +97,35 @@ static inline void exp_window(struct resample *r, double *w, double t, uint32_t
static inline void exp_config(struct resample *r)
{
const struct quality *q = &window_info[r->config.window].qualities[r->quality];
if (r->config.exp_params.A == 0.0)
r->config.exp_params.A = q->params[0];
const uint32_t p0 = RESAMPLE_PARAM_EXP_A;
if (r->config.params[p0] == 0.0)
r->config.params[p0] = q->params[p0];
}
#include "dbesi0.c"
static const struct quality kaiser_qualities[] = {
{ 8, 0.53, 1.0, { 5.0, }},
{ 16, 0.67, 1.0, { 5.5, }},
{ 24, 0.75, 1.0, { 6.5, }},
{ 32, 0.80, 1.0, { 7.5, }},
{ 48, 0.85, 1.0, { 8.5, }}, /* default */
{ 64, 0.88, 1.0, { 9.5, }},
{ 80, 0.895, 1.0, { 10.0, }},
{ 96, 0.910, 1.0, { 10.5, }},
{ 128, 0.936, 1.0, { 10.7, }},
{ 144, 0.945, 1.0, { 11.5, }},
{ 160, 0.950, 1.0, { 12.5, }},
{ 192, 0.960, 1.0, { 13.5, }},
{ 256, 0.970, 1.0, { 14.5, }},
{ 896, 0.990, 1.0, { 16.67, }},
{ 1024, 0.995, 1.0, { 17.67, }},
{ 8, 0.53, 0.53, { 5.653260, 60.0, 0.50 }},
{ 16, 0.67, 0.67, { 6.204260, 65.0, 0.25 }},
{ 24, 0.75, 0.75, { 6.534860, 68.0, 0.18 }},
{ 32, 0.80, 0.80, { 6.975660, 72.0, 0.140 }},
{ 48, 0.85, 0.85, { 7.857260, 80.0, 0.105 }}, /* default */
{ 64, 0.88, 0.88, { 8.408260, 85.0, 0.085 }},
{ 80, 0.895, 0.895, { 9.510260, 95.0, 0.076 }},
{ 96, 0.910, 0.910, { 10.061260, 100.0, 0.067 }},
{ 128, 0.936, 0.936, { 10.612260, 105.0, 0.053 }},
{ 160, 0.950, 0.950, { 11.163260, 110.0, 0.0445 }},
{ 192, 0.960, 0.960, { 11.714260, 115.0, 0.039 }},
{ 256, 0.970, 0.970, { 12.265260, 120.0, 0.0305 }},
{ 512, 0.980, 0.980, { 13.367260, 130.0, 0.0166 }},
{ 768, 0.985, 0.985, { 14.689660, 142.0, 0.01216 }},
{ 1024, 0.990, 0.990, { 16.122260, 155.0, 0.01 }},
};
static inline void kaiser_window(struct resample *r, double *w, double t, uint32_t n_taps)
{
double x, alpha = r->config.kaiser_params.alpha, beta = M_PI*alpha, den = dbesi0(beta);
double x, beta = r->config.params[RESAMPLE_PARAM_KAISER_ALPHA] * M_PI;
double den = dbesi0(beta);
uint32_t i, n_taps12 = n_taps/2;
for (i = 0; i < n_taps12; i++, t += 1.0) {
x = 2.0 * t / n_taps;
@ -136,10 +139,10 @@ static inline void kaiser_config(struct resample *r)
double A, B, dw, tr_bw;
uint32_t n;
A = r->config.kaiser_params.stopband_attenuation;
A = r->config.params[RESAMPLE_PARAM_KAISER_SB_ATT];
if (A <= 0.0)
A = 160;
tr_bw = r->config.kaiser_params.transition_bandwidth;
tr_bw = r->config.params[RESAMPLE_PARAM_KAISER_TR_BW];
if (tr_bw <= 0.0)
tr_bw = 0.0305;
@ -156,15 +159,16 @@ static inline void kaiser_config(struct resample *r)
/* order of the filter */
n = (uint32_t)((A - 8.0) / (2.285 * dw));
r->config.kaiser_params.alpha = B;
r->config.params[RESAMPLE_PARAM_KAISER_ALPHA] = B / M_PI;
r->config.n_taps = n + 1;
}
#else
static inline void kaiser_config(struct resample *r)
{
const struct quality *q = &window_info[r->config.window].qualities[r->quality];
if (r->config.kaiser_params.alpha == 0.0)
r->config.kaiser_params.alpha = q->params[0];
const uint32_t p0 = RESAMPLE_PARAM_KAISER_ALPHA;
if (r->config.params[p0] == 0.0)
r->config.params[p0] = q->params[p0];
}
#endif
@ -471,14 +475,17 @@ int resample_native_init(struct resample *r)
{
struct native_data *d;
const struct quality *q;
double scale, cutoff_factor;
double scale, cutoff;
uint32_t i, n_taps, n_phases, filter_size, in_rate, out_rate, gcd, filter_stride;
uint32_t history_stride, history_size, oversample;
struct resample_config *c = &r->config;
#ifndef RESAMPLE_DISABLE_PRECOMP
struct resample_config def = { 0 };
bool default_config;
if (c->window == RESAMPLE_WINDOW_DEFAULT)
c->window = RESAMPLE_WINDOW_EXP;
default_config = memcmp(c, &def, sizeof(def)) == 0;
#endif
c->window = SPA_CLAMP(c->window, 0u, SPA_N_ELEMENTS(window_info)-1);
r->quality = SPA_CLAMP(r->quality, 0, (int)(window_info[c->window].n_qualities - 1));
r->free = impl_native_free;
r->update_rate = impl_native_update_rate;
@ -492,8 +499,8 @@ int resample_native_init(struct resample *r)
window_info[c->window].config(r);
q = &window_info[c->window].qualities[r->quality];
cutoff_factor = r->o_rate < r->i_rate ? q->cutoff_factor : 1.0;
c->cutoff = c->cutoff <= 0.0 ? q->cutoff * cutoff_factor: c->cutoff;
cutoff = r->o_rate < r->i_rate ? q->cutoff_down : q->cutoff_up;
c->cutoff = c->cutoff <= 0.0 ? cutoff: c->cutoff;
n_taps = c->n_taps == 0 ? q->n_taps : c->n_taps;
gcd = calc_gcd(r->i_rate, r->o_rate);
@ -545,14 +552,15 @@ int resample_native_init(struct resample *r)
#ifndef RESAMPLE_DISABLE_PRECOMP
/* See if we have precomputed coefficients */
for (i = 0; precomp_coeffs[i].filter; i++) {
if (precomp_coeffs[i].in_rate == r->i_rate &&
if (default_config &&
precomp_coeffs[i].in_rate == r->i_rate &&
precomp_coeffs[i].out_rate == r->o_rate &&
precomp_coeffs[i].quality == r->quality)
break;
}
if (precomp_coeffs[i].filter) {
spa_log_debug(r->log, "using precomputed filter for %u->%u(%u)",
spa_log_info(r->log, "using precomputed filter for %u->%u(%u)",
r->i_rate, r->o_rate, r->quality);
spa_memcpy(d->filter, precomp_coeffs[i].filter, filter_size);
} else {

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 */