mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-19 18:40:31 +00:00
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/* -*- Mode: c; c-basic-offset: 2 -*- */
|
|
_FORMAT *in_data, *out_data;
|
|
|
|
/* get a buffer here so that we can have something to interpolate
|
|
* against for the first few samples if speed < 0.5 */
|
|
in_data = (_FORMAT*) GST_BUFFER_DATA(in);
|
|
nin = GST_BUFFER_SIZE(in)/sizeof(_FORMAT);
|
|
lower = in_data[0];
|
|
i_float = 0.5 * (speed - 1.0);
|
|
i = i_float + 1.0; /* ciel(i_float) for ints */
|
|
|
|
do {
|
|
speed = filter->speed; /* update this, it might have changed */
|
|
|
|
if (filter->srcpool) {
|
|
out = gst_buffer_new_from_pool(filter->srcpool, 0, 0);
|
|
out_data = (_FORMAT*) GST_BUFFER_DATA(out);
|
|
} else {
|
|
out = gst_buffer_new();
|
|
GST_BUFFER_DATA(out) = (gchar*) g_new(_FORMAT,SPEED_BUFSIZE/sizeof(_FORMAT));
|
|
GST_BUFFER_SIZE(out) = SPEED_BUFSIZE;
|
|
out_data = (_FORMAT*) GST_BUFFER_DATA(out);
|
|
}
|
|
nout = GST_BUFFER_SIZE(out) / sizeof(_FORMAT);
|
|
|
|
for (j=0; j<nout; j++) {
|
|
/* index of upper bounds of interpolation for
|
|
* new sample, got it by trial&error on the chalkboard */
|
|
i_float += speed;
|
|
i = i_float + 1.0; /* ciel(i_float) for ints */
|
|
|
|
while (i >= nin) {
|
|
i = i % nin;
|
|
i_float = i_float - nin;
|
|
lower = in_data[nin-1];
|
|
gst_buffer_unref(in);
|
|
in = gst_pad_pull (filter->sinkpad);
|
|
|
|
while (GST_IS_EVENT(in)) {
|
|
switch (GST_EVENT_TYPE(in)) {
|
|
case GST_EVENT_EOS:
|
|
gst_element_set_eos((GstElement*)filter);
|
|
gst_pad_push(filter->srcpad, in);
|
|
return;
|
|
default:
|
|
gst_pad_push(filter->srcpad, in);
|
|
in = gst_pad_pull (filter->sinkpad);
|
|
}
|
|
}
|
|
|
|
in_data = (_FORMAT*) GST_BUFFER_DATA(in);
|
|
nin = GST_BUFFER_SIZE(in) / sizeof(_FORMAT);
|
|
}
|
|
|
|
if (i>0)
|
|
lower = in_data[i-1];
|
|
|
|
interp = i_float - floor(i_float);
|
|
|
|
out_data[j] = lower*(1-interp) + in_data[i]*interp;
|
|
|
|
lower = in_data[i];
|
|
}
|
|
|
|
gst_pad_push(filter->srcpad, out);
|
|
|
|
gst_element_yield (element);
|
|
} while (TRUE);
|