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af_pan: add af-command support to change the matrix

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This allows for seamless changes in the downmixing matrix without having
to reinitialize the filter chain.
This commit is contained in:
Hector Martin 2016-09-19 21:22:58 +09:00 committed by wm4
parent 0525f5fa93
commit ed8540c38e
2 changed files with 38 additions and 19 deletions
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7
DOCS/man/af.rst
View File

@ -312,6 +312,13 @@ Available filters are:
``mpv '--af=format=channels=5.1' '--audio-channels=5.1'`` would always force
remixing audio to 5.1 and output it like this.
This filter supports the following ``af-command`` commands:
``set-matrix``
Set the ``<matrix>`` argument dynamically. This can be used to change
the mixing matrix at runtime, without reinitializing the entire filter
chain.
``drc[=method:target]``
Applies dynamic range compression. This maximizes the volume by compressing
the audio signal's dynamic range. (Formerly called ``volnorm``.)

50
audio/filter/af_pan.c
View File

@ -43,6 +43,27 @@ static void set_channels(struct mp_audio *mpa, int num)
mp_audio_set_channels(mpa, &map);
}
static void parse_matrix(struct af_instance *af, const char *cp)
{
af_pan_t *s = af->priv;
int j = 0, k = 0, n;
while (cp && k < AF_NCH) {
sscanf(cp, "%f%n" , &s->level[j][k], &n);
MP_VERBOSE(af, "Pan level from channel %i to"
" channel %i = %f\n", k, j, s->level[j][k]);
cp = &cp[n];
j++;
if (j >= s->nch) {
j = 0;
k++;
}
if (*cp != ',')
break;
cp++;
}
}
// Initialization and runtime control
static int control(struct af_instance *af, int cmd, void *arg)
{
@ -102,6 +123,15 @@ static int control(struct af_instance *af, int cmd, void *arg)
return AF_ERROR;
*(float*)arg = s->level[0][1] - s->level[1][0];
return AF_OK;
case AF_CONTROL_COMMAND: {
char **args = arg;
if (!strcmp(args[0], "set-matrix")) {
parse_matrix(af, args[1]);
return CONTROL_OK;
} else {
return CONTROL_ERROR;
}
}
}
return AF_UNKNOWN;
}
@ -151,30 +181,12 @@ static int af_open(struct af_instance *af)
af->control = control;
af->filter_frame = filter_frame;
af_pan_t *s = af->priv;
int n = 0;
int j, k;
int nch = s->nch;
if (nch && AF_OK != control(af, AF_CONTROL_SET_PAN_NOUT, &nch))
return AF_ERROR;
// Read pan values
char *cp = s->matrixstr;
j = 0; k = 0;
while (cp && k < AF_NCH) {
sscanf(cp, "%f%n" , &s->level[j][k], &n);
MP_VERBOSE(af, "Pan level from channel %i to"
" channel %i = %f\n", k, j, s->level[j][k]);
cp = &cp[n];
j++;
if (j >= nch) {
j = 0;
k++;
}
if (*cp != ',')
break;
cp++;
}
parse_matrix(af, s->matrixstr);
return AF_OK;
}