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avfilter/af_afade: add 4 more curves

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This commit is contained in:
Paul B Mahol 2023-08-20 17:36:45 +02:00
parent e41bd6e65e
commit 52ebb15ec1
2 changed files with 29 additions and 1 deletions
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8
doc/filters.texi
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@ -1459,6 +1459,14 @@ select logistic sigmoid
select sine cardinal function
@item isinc
select inverted sine cardinal function
@item quat
select quartic
@item quatr
select quartic root
@item qsin2
select squared quarter of sine wave
@item hsin2
select squared half of sine wave
@item nofade
no fade applied
@end table

22
libavfilter/af_afade.c
View File

@ -58,7 +58,7 @@ typedef struct AudioFadeContext {
int curve0, int curve1);
} AudioFadeContext;
enum CurveType { NONE = -1, TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, LOSI, SINC, ISINC, NB_CURVES };
enum CurveType { NONE = -1, TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, LOSI, SINC, ISINC, QUAT, QUATR, QSIN2, HSIN2, NB_CURVES };
#define OFFSET(x) offsetof(AudioFadeContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
@ -142,6 +142,18 @@ static double fade_gain(int curve, int64_t index, int64_t range, double silence,
case ISINC:
gain = gain <= 0.0 ? 0.0 : 1.0 - sin(M_PI * gain) / (M_PI * gain);
break;
case QUAT:
gain = gain * gain * gain * gain;
break;
case QUATR:
gain = pow(gain, 0.25);
break;
case QSIN2:
gain = sin(gain * M_PI / 2.0) * sin(gain * M_PI / 2.0);
break;
case HSIN2:
gain = pow((1.0 - cos(gain * M_PI)) / 2.0, 2.0);
break;
case NONE:
gain = 1.0;
break;
@ -316,6 +328,10 @@ static const AVOption afade_options[] = {
{ "losi", "logistic sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = LOSI }, 0, 0, TFLAGS, "curve" },
{ "sinc", "sine cardinal function", 0, AV_OPT_TYPE_CONST, {.i64 = SINC }, 0, 0, TFLAGS, "curve" },
{ "isinc", "inverted sine cardinal function", 0, AV_OPT_TYPE_CONST, {.i64 = ISINC}, 0, 0, TFLAGS, "curve" },
{ "quat", "quartic", 0, AV_OPT_TYPE_CONST, {.i64 = QUAT }, 0, 0, TFLAGS, "curve" },
{ "quatr", "quartic root", 0, AV_OPT_TYPE_CONST, {.i64 = QUATR}, 0, 0, TFLAGS, "curve" },
{ "qsin2", "squared quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN2}, 0, 0, TFLAGS, "curve" },
{ "hsin2", "squared half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN2}, 0, 0, TFLAGS, "curve" },
{ "silence", "set the silence gain", OFFSET(silence), AV_OPT_TYPE_DOUBLE, {.dbl = 0 }, 0, 1, TFLAGS },
{ "unity", "set the unity gain", OFFSET(unity), AV_OPT_TYPE_DOUBLE, {.dbl = 1 }, 0, 1, TFLAGS },
{ NULL }
@ -464,6 +480,10 @@ static const AVOption acrossfade_options[] = {
{ "losi", "logistic sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = LOSI }, 0, 0, FLAGS, "curve" },
{ "sinc", "sine cardinal function", 0, AV_OPT_TYPE_CONST, {.i64 = SINC }, 0, 0, FLAGS, "curve" },
{ "isinc", "inverted sine cardinal function", 0, AV_OPT_TYPE_CONST, {.i64 = ISINC}, 0, 0, FLAGS, "curve" },
{ "quat", "quartic", 0, AV_OPT_TYPE_CONST, {.i64 = QUAT }, 0, 0, FLAGS, "curve" },
{ "quatr", "quartic root", 0, AV_OPT_TYPE_CONST, {.i64 = QUATR}, 0, 0, FLAGS, "curve" },
{ "qsin2", "squared quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN2}, 0, 0, FLAGS, "curve" },
{ "hsin2", "squared half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN2}, 0, 0, FLAGS, "curve" },
{ "curve2", "set fade curve type for 2nd stream", OFFSET(curve2), AV_OPT_TYPE_INT, {.i64 = TRI }, NONE, NB_CURVES - 1, FLAGS, "curve" },
{ "c2", "set fade curve type for 2nd stream", OFFSET(curve2), AV_OPT_TYPE_INT, {.i64 = TRI }, NONE, NB_CURVES - 1, FLAGS, "curve" },
{ NULL }