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dshowvideosrc: delay selecting device until source is started

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The previous behaviour had issues when setting one of the device properties
after _get_caps had been called. The device shouldn't be locked in until after
_start has been called.
This commit is contained in:
Joshua M. Doe 2018-10-12 08:57:07 -04:00 committed by Nirbheek Chauhan
parent 4b4535b35c
commit 73a84148d3
1 changed files with 36 additions and 21 deletions
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57
sys/dshowsrcwrapper/gstdshowvideosrc.cpp
View file

@ -89,6 +89,8 @@ static GstCaps *gst_dshowvideosrc_src_fixate (GstBaseSrc * bsrc, GstCaps * caps)
static GstFlowReturn gst_dshowvideosrc_create (GstPushSrc * psrc,
GstBuffer ** buf);
static gboolean gst_dshowvideosrc_create_capture_filter(GstDshowVideoSrc * src);
/*utils*/
static GstCaps *gst_dshowvideosrc_getcaps_from_streamcaps (GstDshowVideoSrc *
src, IPin * pin);
@ -318,18 +320,41 @@ gst_dshowvideosrc_get_property (GObject * object, guint prop_id,
static GstCaps *
gst_dshowvideosrc_get_caps (GstBaseSrc * basesrc, GstCaps * filter)
{
GstDshowVideoSrc *src = GST_DSHOWVIDEOSRC (basesrc);
GstCaps *caps;
if (src->caps) {
caps = gst_caps_ref (src->caps);
} else {
caps = gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD (src));
}
if (caps) {
GstCaps *filtcaps;
if (filter) {
filtcaps = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
} else {
filtcaps = gst_caps_ref (caps);
}
gst_caps_unref (caps);
return filtcaps;
}
return NULL;
}
static gboolean
gst_dshowvideosrc_create_capture_filter(GstDshowVideoSrc * src)
{
HRESULT hres = S_OK;
IBindCtx *lpbc = NULL;
IMoniker *videom;
DWORD dwEaten;
GstDshowVideoSrc *src = GST_DSHOWVIDEOSRC (basesrc);
gunichar2 *unidevice = NULL;
if (src->caps) {
return gst_caps_ref (src->caps);
}
/* device will be used first, then device-name, then device-index */
if (!src->device) {
GST_DEBUG_OBJECT (src, "No device set, will enumerate to match device-name or device-index");
@ -339,7 +364,7 @@ gst_dshowvideosrc_get_caps (GstBaseSrc * basesrc, GstCaps * filter)
&src->device_name, &src->device_index);
if (!src->device) {
GST_ERROR ("No video device found.");
return NULL;
return FALSE;
}
}
@ -363,6 +388,8 @@ gst_dshowvideosrc_get_caps (GstBaseSrc * basesrc, GstCaps * filter)
}
}
g_free (unidevice);
if (!src->caps) {
src->caps = gst_caps_new_empty ();
}
@ -415,21 +442,7 @@ gst_dshowvideosrc_get_caps (GstBaseSrc * basesrc, GstCaps * filter)
}
}
g_free (unidevice);
if (src->caps) {
GstCaps *caps;
if (filter) {
caps = gst_caps_intersect_full (filter, src->caps, GST_CAPS_INTERSECT_FIRST);
} else {
caps = gst_caps_ref (src->caps);
}
return caps;
}
return NULL;
return TRUE;
}
static GstStateChangeReturn
@ -480,6 +493,8 @@ gst_dshowvideosrc_start (GstBaseSrc * bsrc)
HRESULT hres = S_FALSE;
GstDshowVideoSrc *src = GST_DSHOWVIDEOSRC (bsrc);
gst_dshowvideosrc_create_capture_filter (src);
/*
The filter graph now is created via the IGraphBuilder Interface
Code added to build upstream filters, needed for USB Analog TV Tuners / DVD Maker, based on AMCap code.