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avfilter/asrc_anoisesrc: add velvet noise

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This commit is contained in:
Paul B Mahol 2020-01-13 17:56:19 +01:00
parent fdddc0d678
commit 273886fa60
2 changed files with 16 additions and 8 deletions
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2
doc/filters.texi
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@ -5985,7 +5985,7 @@ results in noise with an infinite length.
@item color, colour, c @item color, colour, c
Specify the color of noise. Available noise colors are white, pink, brown, Specify the color of noise. Available noise colors are white, pink, brown,
blue and violet. Default color is white. blue, violet and velvet. Default color is white.
@item seed, s @item seed, s
Specify a value used to seed the PRNG. Specify a value used to seed the PRNG.

22
libavfilter/asrc_anoisesrc.c
View File

@ -36,7 +36,7 @@ typedef struct ANoiseSrcContext {
int64_t pts; int64_t pts;
int infinite; int infinite;
double (*filter)(double white, double *buf); double (*filter)(double white, double *buf, double half_amplitude);
double buf[7]; double buf[7];
AVLFG c; AVLFG c;
} ANoiseSrcContext; } ANoiseSrcContext;
@ -47,6 +47,7 @@ enum NoiseMode {
NM_BROWN, NM_BROWN,
NM_BLUE, NM_BLUE,
NM_VIOLET, NM_VIOLET,
NM_VELVET,
NM_NB NM_NB
}; };
@ -68,6 +69,7 @@ static const AVOption anoisesrc_options[] = {
{ "brown", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_BROWN}, 0, 0, FLAGS, "color" }, { "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" }, { "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" }, { "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 }, { "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 }, { "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 }, { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
@ -111,12 +113,12 @@ static av_cold int query_formats(AVFilterContext *ctx)
return ff_set_common_samplerates(ctx, formats); 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; return white;
} }
static double pink_filter(double white, double *buf) static double pink_filter(double white, double *buf, double ha)
{ {
double pink; double pink;
@ -132,7 +134,7 @@ static double pink_filter(double white, double *buf)
return pink * 0.11; return pink * 0.11;
} }
static double blue_filter(double white, double *buf) static double blue_filter(double white, double *buf, double ha)
{ {
double blue; double blue;
@ -148,7 +150,7 @@ static double blue_filter(double white, double *buf)
return blue * 0.11; return blue * 0.11;
} }
static double brown_filter(double white, double *buf) static double brown_filter(double white, double *buf, double ha)
{ {
double brown; double brown;
@ -157,7 +159,7 @@ static double brown_filter(double white, double *buf)
return brown * 3.5; return brown * 3.5;
} }
static double violet_filter(double white, double *buf) static double violet_filter(double white, double *buf, double ha)
{ {
double violet; double violet;
@ -166,6 +168,11 @@ static double violet_filter(double white, double *buf)
return violet * 3.5; 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) static av_cold int config_props(AVFilterLink *outlink)
{ {
AVFilterContext *ctx = outlink->src; AVFilterContext *ctx = outlink->src;
@ -185,6 +192,7 @@ static av_cold int config_props(AVFilterLink *outlink)
case NM_BROWN: s->filter = brown_filter; break; case NM_BROWN: s->filter = brown_filter; break;
case NM_BLUE: s->filter = blue_filter; break; case NM_BLUE: s->filter = blue_filter; break;
case NM_VIOLET: s->filter = violet_filter; break; case NM_VIOLET: s->filter = violet_filter; break;
case NM_VELVET: s->filter = velvet_filter; break;
} }
return 0; return 0;
@ -213,7 +221,7 @@ static int request_frame(AVFilterLink *outlink)
for (i = 0; i < nb_samples; i++) { for (i = 0; i < nb_samples; i++) {
double white; double white;
white = s->amplitude * ((2 * ((double) av_lfg_get(&s->c) / 0xffffffff)) - 1); 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) if (!s->infinite)