[FFmpeg-devel] [PATCH] avfilter/af_afade: add couple of more curves
Paul B Mahol
onemda at gmail.com
Sun Jun 14 22:26:42 CEST 2015
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 12 +++++++++++-
libavfilter/af_afade.c | 30 +++++++++++++++++++++++++-----
2 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 6437c0c..0712494 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -522,7 +522,7 @@ select half of sine wave
select exponential sine wave
@item log
select logarithmic
- at item par
+ at item ipar
select inverted parabola
@item qua
select quadratic
@@ -532,6 +532,16 @@ select cubic
select square root
@item cbr
select cubic root
+ at item par
+select parabola
+ at item exp
+select exponential
+ at item iqsin
+select inverted quarter of sine wave
+ at item ihsin
+select inverted half of sine wave
+ at item des
+select double-exponential seat
@end table
@end table
diff --git a/libavfilter/af_afade.c b/libavfilter/af_afade.c
index d2c07e5..356eda9 100644
--- a/libavfilter/af_afade.c
+++ b/libavfilter/af_afade.c
@@ -42,7 +42,7 @@ typedef struct {
int64_t start, int range, int curve);
} AudioFadeContext;
-enum CurveType { TRI, QSIN, ESIN, HSIN, LOG, PAR, QUA, CUB, SQU, CBR };
+enum CurveType { TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DES, NB_CURVES };
#define OFFSET(x) offsetof(AudioFadeContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
@@ -60,18 +60,23 @@ static const AVOption afade_options[] = {
{ "st", "set time to start fading", OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
{ "duration", "set fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
{ "d", "set fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
- { "curve", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, TRI, CBR, FLAGS, "curve" },
- { "c", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, TRI, CBR, FLAGS, "curve" },
+ { "curve", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve" },
+ { "c", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve" },
{ "tri", "linear slope", 0, AV_OPT_TYPE_CONST, {.i64 = TRI }, 0, 0, FLAGS, "curve" },
{ "qsin", "quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN }, 0, 0, FLAGS, "curve" },
{ "esin", "exponential sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = ESIN }, 0, 0, FLAGS, "curve" },
{ "hsin", "half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN }, 0, 0, FLAGS, "curve" },
{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64 = LOG }, 0, 0, FLAGS, "curve" },
- { "par", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, FLAGS, "curve" },
+ { "ipar", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = IPAR }, 0, 0, FLAGS, "curve" },
{ "qua", "quadratic", 0, AV_OPT_TYPE_CONST, {.i64 = QUA }, 0, 0, FLAGS, "curve" },
{ "cub", "cubic", 0, AV_OPT_TYPE_CONST, {.i64 = CUB }, 0, 0, FLAGS, "curve" },
{ "squ", "square root", 0, AV_OPT_TYPE_CONST, {.i64 = SQU }, 0, 0, FLAGS, "curve" },
{ "cbr", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64 = CBR }, 0, 0, FLAGS, "curve" },
+ { "par", "parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, FLAGS, "curve" },
+ { "exp", "exponential", 0, AV_OPT_TYPE_CONST, {.i64 = EXP }, 0, 0, FLAGS, "curve" },
+ { "iqsin", "inverted quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IQSIN}, 0, 0, FLAGS, "curve" },
+ { "ihsin", "inverted half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IHSIN}, 0, 0, FLAGS, "curve" },
+ { "des", "double-exponential seat", 0, AV_OPT_TYPE_CONST, {.i64 = DES}, 0, 0, FLAGS, "curve" },
{ NULL }
};
@@ -130,16 +135,28 @@ static double fade_gain(int curve, int64_t index, int range)
case QSIN:
gain = sin(gain * M_PI / 2.0);
break;
+ case IQSIN:
+ gain = 0.636943 * asin(gain);
+ break;
case ESIN:
gain = 1.0 - cos(M_PI / 4.0 * (pow(2.0*gain - 1, 3) + 1));
break;
case HSIN:
gain = (1.0 - cos(gain * M_PI)) / 2.0;
break;
- case LOG:
+ case IHSIN:
+ gain = 0.318471 * acos(1 - 2 * gain);
+ break;
+ case EXP:
gain = pow(0.1, (1 - gain) * 5.0);
break;
+ case LOG:
+ gain = av_clipd(0.0868589 * log(100000 * gain), 0, 1.0);
+ break;
case PAR:
+ gain = 1 - sqrt(1 - gain);
+ break;
+ case IPAR:
gain = (1 - (1 - gain) * (1 - gain));
break;
case QUA:
@@ -154,6 +171,9 @@ static double fade_gain(int curve, int64_t index, int range)
case CBR:
gain = cbrt(gain);
break;
+ case DES:
+ gain = gain <= 0.5 ? pow(2 * gain, 0.2) / 2: 1 - pow(2 * (1 - gain), 0.2) / 2 ;
+ break;
}
return gain;
--
1.7.11.2
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