int sample_rate;
double amplitude;
int64_t duration;
- int64_t color;
+ int color;
int64_t seed;
int nb_samples;
int64_t pts;
int infinite;
- double (*filter)(double white, double *buf);
+ double (*filter)(double white, double *buf, double half_amplitude);
double buf[7];
AVLFG c;
} ANoiseSrcContext;
NM_BROWN,
NM_BLUE,
NM_VIOLET,
+ NM_VELVET,
NM_NB
};
{ "brown", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_BROWN}, 0, 0, FLAGS, "color" },
{ "blue", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_BLUE}, 0, 0, FLAGS, "color" },
{ "violet", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_VIOLET}, 0, 0, FLAGS, "color" },
+ { "velvet", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_VELVET}, 0, 0, FLAGS, "color" },
{ "seed", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT_MAX, FLAGS },
{ "s", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT_MAX, FLAGS },
{ "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
return ff_set_common_samplerates(ctx, formats);
}
-static double white_filter(double white, double *buf)
+static double white_filter(double white, double *buf, double ha)
{
return white;
}
-static double pink_filter(double white, double *buf)
+static double pink_filter(double white, double *buf, double ha)
{
double pink;
return pink * 0.11;
}
-static double blue_filter(double white, double *buf)
+static double blue_filter(double white, double *buf, double ha)
{
double blue;
return blue * 0.11;
}
-static double brown_filter(double white, double *buf)
+static double brown_filter(double white, double *buf, double ha)
{
double brown;
return brown * 3.5;
}
-static double violet_filter(double white, double *buf)
+static double violet_filter(double white, double *buf, double ha)
{
double violet;
return violet * 3.5;
}
+static double velvet_filter(double white, double *buf, double ha)
+{
+ return 2. * ha * ((white > ha) - (white < -ha));
+}
+
static av_cold int config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
case NM_BROWN: s->filter = brown_filter; break;
case NM_BLUE: s->filter = blue_filter; break;
case NM_VIOLET: s->filter = violet_filter; break;
+ case NM_VELVET: s->filter = velvet_filter; break;
}
return 0;
for (i = 0; i < nb_samples; i++) {
double white;
white = s->amplitude * ((2 * ((double) av_lfg_get(&s->c) / 0xffffffff)) - 1);
- dst[i] = s->filter(white, s->buf);
+ dst[i] = s->filter(white, s->buf, s->amplitude * 0.5);
}
if (!s->infinite)