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af_rubberband: add af-command to multiply current pitch 

This commit introduces the multiply-pitch af-command. Users may bind
keys to this command in order to incrementally adjust the pitch of a
track. This will probably mostly be useful for musicians trying to
transpose up and down by semi tones without having to calculate
the correct ratio beforehand.

As an example, here is an input.conf to test this feature:

    { af-command all multiply-pitch 0.9438743126816935
    } af-command all multiply-pitch 1.059463094352953
This commit is contained in:
Vobe 2018-01-08 17:16:02 +01:00 committed by Kevin Mitchell
parent e2a176ede2
commit e7ea893c2f
2 changed files with 22 additions and 6 deletions
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6
DOCS/man/af.rst
View File

@ -225,6 +225,12 @@ Available filters are:
change the playback pitch at runtime. Note that speed is controlled
using the standard ``speed`` property, not ``af-command``.
``multiply-pitch <factor>``
Multiply the current value of ``<pitch-scale>`` dynamically. For
example: 0.5 to go down by an octave, 1.5 to go up by a perfect fifth.
If you want to go up or down by semi-tones, use 1.059463094352953 and
0.9438743126816935
``lavfi=graph``
Filter audio using FFmpeg's libavfilter.

22
audio/filter/af_rubberband.c
View File

@ -45,12 +45,16 @@ static void update_speed(struct af_instance *af, double new_speed)
rubberband_set_time_ratio(p->rubber, 1.0 / p->speed);
}
static void update_pitch(struct af_instance *af, double new_pitch)
static bool update_pitch(struct af_instance *af, double new_pitch)
{
if (new_pitch < 0.01 || new_pitch > 100.0)
return false;
struct priv *p = af->priv;
p->pitch = new_pitch;
rubberband_set_pitch_scale(p->rubber, p->pitch);
return true;
}
static int control(struct af_instance *af, int cmd, void *arg)
@ -99,13 +103,19 @@ static int control(struct af_instance *af, int cmd, void *arg)
return AF_OK;
case AF_CONTROL_COMMAND: {
char **args = arg;
char *endptr;
double pitch = p->pitch;
if (!strcmp(args[0], "set-pitch")) {
char *endptr;
double pitch = strtod(args[1], &endptr);
if (*endptr || pitch < 0.01 || pitch > 100.0)
pitch = strtod(args[1], &endptr);
if (*endptr)
return CONTROL_ERROR;
update_pitch(af, pitch);
return CONTROL_OK;
return update_pitch(af, pitch) ? CONTROL_OK : CONTROL_ERROR;
} else if (!strcmp(args[0], "multiply-pitch")) {
double mult = strtod(args[1], &endptr);
if (*endptr || mult <= 0)
return CONTROL_ERROR;
pitch *= mult;
return update_pitch(af, pitch) ? CONTROL_OK : CONTROL_ERROR;
} else {
return CONTROL_ERROR;
}