virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-28 20:53:54 +02:00
Code Issues Releases Activity

avfilter/asrc_sine: factorize sampling to a separate context

Browse Source 
Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2024-11-09 10:37:14 +01:00
parent 6189cb47fc
commit 06247ae746
1 changed files with 23 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
libavfilter/asrc_sine.c
View File

@ -30,6 +30,11 @@
#include "filters.h"
#include "formats.h"
typedef struct SamplingContext {
uint32_t phi; ///< current phase of the sine (2pi = 1<<32)
uint32_t dphi; ///< phase increment between two samples
} SamplingContext;
typedef struct SineContext {
const AVClass *class;
double frequency;
@ -40,13 +45,11 @@ typedef struct SineContext {
int64_t duration;
int16_t *sin;
int64_t pts;
uint32_t phi; ///< current phase of the sine (2pi = 1<<32)
uint32_t dphi; ///< phase increment between two samples
SamplingContext signal;
SamplingContext beep;
unsigned beep_period;
unsigned beep_index;
unsigned beep_length;
uint32_t phi_beep; ///< current phase of the beep
uint32_t dphi_beep; ///< phase increment of the beep
} SineContext;
#define CONTEXT SineContext
@ -143,6 +146,16 @@ enum {
VAR_VARS_NB
};
static void sampling_init(SamplingContext *c, double frequency, int sample_rate)
{
c->dphi = ldexp(frequency, 32) / sample_rate + 0.5;
}
static av_always_inline void sampling_advance(SamplingContext *c)
{
c->phi += c->dphi;
}
static av_cold int init(AVFilterContext *ctx)
{
int ret;
@ -150,14 +163,13 @@ static av_cold int init(AVFilterContext *ctx)
if (!(sine->sin = av_malloc(sizeof(*sine->sin) << LOG_PERIOD)))
return AVERROR(ENOMEM);
sine->dphi = ldexp(sine->frequency, 32) / sine->sample_rate + 0.5;
sampling_init(&sine->signal, sine->frequency, sine->sample_rate);
make_sin_table(sine->sin);
if (sine->beep_factor) {
sine->beep_period = sine->sample_rate;
sine->beep_length = sine->beep_period / 25;
sine->dphi_beep = ldexp(sine->beep_factor * sine->frequency, 32) /
sine->sample_rate + 0.5;
sampling_init(&sine->beep, sine->beep_factor * sine->frequency, sine->sample_rate);
}
ret = av_expr_parse(&sine->samples_per_frame_expr,
@ -241,11 +253,11 @@ static int activate(AVFilterContext *ctx)
samples = (int16_t *)frame->data[0];
for (i = 0; i < nb_samples; i++) {
samples[i] = sine->sin[sine->phi >> (32 - LOG_PERIOD)];
sine->phi += sine->dphi;
samples[i] = sine->sin[sine->signal.phi >> (32 - LOG_PERIOD)];
sampling_advance(&sine->signal);
if (sine->beep_index < sine->beep_length) {
samples[i] += sine->sin[sine->phi_beep >> (32 - LOG_PERIOD)] * 2;
sine->phi_beep += sine->dphi_beep;
samples[i] += sine->sin[sine->beep.phi >> (32 - LOG_PERIOD)] * 2;
sampling_advance(&sine->beep);
}
if (++sine->beep_index == sine->beep_period)
sine->beep_index = 0;