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videomixer: Implement sinkpad GetCapsFunction.

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This allows returning only the formats, width, height, framerate
and pixel-aspect-ratio that downstream can support.

https://bugzilla.gnome.org/show_bug.cgi?id=620148
This commit is contained in:
Edward Hervey 2010-05-31 13:30:05 +02:00
parent 0d5ae784b1
commit 01abf5b94e
1 changed files with 63 additions and 0 deletions
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63
gst/videomixer/videomixer.c
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@ -374,6 +374,67 @@ beach:
return ret;
}
static GstCaps *
gst_videomixer_pad_sink_getcaps (GstPad * pad)
{
GstVideoMixer *mix;
GstVideoMixerPad *mixpad;
GstCaps *res = NULL;
int ncaps, i;
GstStructure *st;
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
mixpad = GST_VIDEO_MIXER_PAD (pad);
if (!mixpad)
goto beach;
res = gst_pad_peer_get_caps (mix->srcpad);
if (G_UNLIKELY (res == NULL)) {
/* If no peer, then return template */
res = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
goto beach;
}
ncaps = gst_caps_get_size (res);
/* This Upstream can only produce:
* * The formats that downstream can do (intersected above)
* * The PAR that downstream can do
* * Width within the maximum of what downstream can do
* * Height within the maximum of what downstream can do
* * a framerate at least greater than what downstream can do */
GST_VIDEO_MIXER_STATE_LOCK (mix);
if (mix->out_width) {
/* If we already have some configured with/height/framerate/par,
* then limit the returned caps */
for (i = 0; i < ncaps; i++) {
st = gst_caps_get_structure (res, i);
gst_structure_set (st,
"width", GST_TYPE_INT_RANGE, mix->in_width, G_MAXINT32,
"height", GST_TYPE_INT_RANGE, mix->in_height, G_MAXINT32,
"framerate", GST_TYPE_FRACTION_RANGE, mix->fps_n, mix->fps_d,
G_MAXINT32, 1, "pixel-aspect-ratio", GST_TYPE_FRACTION, mix->par_n,
mix->par_d, NULL);
}
} else {
GstCaps *tmp;
/* If we don't have configured values, just intersect with our
* pad template */
tmp = res;
res = gst_caps_intersect (res, gst_pad_get_pad_template_caps (pad));
gst_caps_unref (tmp);
}
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
beach:
GST_DEBUG_OBJECT (pad, "Returning %" GST_PTR_FORMAT, res);
return res;
}
/*
* We accept the caps if it has the same format as other sink pads in
* the element.
@ -429,6 +490,8 @@ gst_videomixer_pad_init (GstVideoMixerPad * mixerpad)
gst_videomixer_pad_sink_setcaps);
gst_pad_set_acceptcaps_function (GST_PAD (mixerpad),
GST_DEBUG_FUNCPTR (gst_videomixer_pad_sink_acceptcaps));
gst_pad_set_getcaps_function (GST_PAD (mixerpad),
gst_videomixer_pad_sink_getcaps);
mixerpad->zorder = DEFAULT_PAD_ZORDER;
mixerpad->xpos = DEFAULT_PAD_XPOS;