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decklink: Add property probing

Browse source 
Renames the subdevice property to just device, and has it
return the number of devices in the system in response to
a probe. This is useful both for using multiple capture
cards, and for detecting whether it's worth adding the
element to a pipeline.

Also cleans up the property descriptions.
This commit is contained in:
David Schleef 2012-03-07 19:22:28 -08:00
parent b45c206647
commit 7cd0ac046a
4 changed files with 161 additions and 18 deletions
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1
sys/decklink/Makefile.am
View file

@ -11,6 +11,7 @@ libgstdecklink_la_LIBADD = \
$(GST_BASE_LIBS) \
$(GST_LIBS) \
-lgstvideo-@GST_MAJORMINOR@ \
-lgstinterfaces-@GST_MAJORMINOR@ \
$(DECKLINK_LIBS) \
$(LIBM)
libgstdecklink_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

3
sys/decklink/gstdecklinksink.cpp
View file

@ -189,7 +189,8 @@ gst_decklink_sink_class_init (GstDecklinkSinkClass * klass)
element_class->query = GST_DEBUG_FUNCPTR (gst_decklink_sink_query);
g_object_class_install_property (gobject_class, PROP_MODE,
g_param_spec_enum ("mode", "Mode", "Mode",
g_param_spec_enum ("mode", "Playback Mode",
"Video Mode to use for playback",
GST_TYPE_DECKLINK_MODE, GST_DECKLINK_MODE_NTSC,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));

173
sys/decklink/gstdecklinksrc.cpp
View file

@ -45,6 +45,8 @@
#include "gstdecklinksrc.h"
#include "capture.h"
#include <string.h>
#include <gst/interfaces/propertyprobe.h>
GST_DEBUG_CATEGORY (gst_decklink_src_debug_category);
#define GST_CAT_DEFAULT gst_decklink_src_debug_category
@ -118,6 +120,10 @@ static gboolean gst_decklink_src_video_src_query (GstPad * pad,
GstQuery * query);
static GstIterator *gst_decklink_src_video_src_iterintlink (GstPad * pad);
static void
gst_decklinksrc_property_probe_interface_init (GstPropertyProbeInterface *
iface);
static void gst_decklink_src_task (void *priv);
#ifdef _MSC_VER
@ -131,7 +137,7 @@ enum
PROP_MODE,
PROP_CONNECTION,
PROP_AUDIO_INPUT,
PROP_SUBDEVICE
PROP_DEVICE
};
/* pad templates */
@ -147,12 +153,24 @@ GST_STATIC_PAD_TEMPLATE ("audiosrc",
/* class initialization */
#define DEBUG_INIT(bla) \
GST_DEBUG_CATEGORY_INIT (gst_decklink_src_debug_category, "decklinksrc", 0, \
static void
gst_decklinksrc_init_interfaces (GType type)
{
static const GInterfaceInfo decklinksrc_propertyprobe_info = {
(GInterfaceInitFunc) gst_decklinksrc_property_probe_interface_init,
NULL,
NULL,
};
GST_DEBUG_CATEGORY_INIT (gst_decklink_src_debug_category, "decklinksrc", 0,
"debug category for decklinksrc element");
g_type_add_interface_static (type, GST_TYPE_PROPERTY_PROBE,
&decklinksrc_propertyprobe_info);
}
GST_BOILERPLATE_FULL (GstDecklinkSrc, gst_decklink_src, GstElement,
GST_TYPE_ELEMENT, DEBUG_INIT);
GST_TYPE_ELEMENT, gst_decklinksrc_init_interfaces);
static void
gst_decklink_src_base_init (gpointer g_class)
@ -196,27 +214,29 @@ gst_decklink_src_class_init (GstDecklinkSrcClass * klass)
element_class->query = GST_DEBUG_FUNCPTR (gst_decklink_src_query);
g_object_class_install_property (gobject_class, PROP_MODE,
g_param_spec_enum ("mode", "Mode", "Mode",
g_param_spec_enum ("mode", "Mode", "Video Mode to use for capture",
GST_TYPE_DECKLINK_MODE, GST_DECKLINK_MODE_NTSC,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class, PROP_CONNECTION,
g_param_spec_enum ("connection", "Connection", "Connection",
g_param_spec_enum ("connection", "Connection",
"Video Input Connection to use",
GST_TYPE_DECKLINK_CONNECTION, GST_DECKLINK_CONNECTION_SDI,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class, PROP_AUDIO_INPUT,
g_param_spec_enum ("audio-input", "Audio Input", "Audio Input Connection",
g_param_spec_enum ("audio-input", "Audio Input",
"Audio Input Connection",
GST_TYPE_DECKLINK_AUDIO_CONNECTION,
GST_DECKLINK_AUDIO_CONNECTION_AUTO,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class, PROP_SUBDEVICE,
g_param_spec_int ("subdevice", "Subdevice", "Subdevice",
0, 3, 0,
g_object_class_install_property (gobject_class, PROP_DEVICE,
g_param_spec_int ("device", "Device", "Capture device instance to use",
0, G_MAXINT, 0,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
}
@ -297,7 +317,7 @@ gst_decklink_src_init (GstDecklinkSrc * decklinksrc,
decklinksrc->mode = GST_DECKLINK_MODE_NTSC;
decklinksrc->connection = GST_DECKLINK_CONNECTION_SDI;
decklinksrc->audio_connection = GST_DECKLINK_AUDIO_CONNECTION_AUTO;
decklinksrc->subdevice = 0;
decklinksrc->device = 0;
decklinksrc->stop = FALSE;
decklinksrc->dropped_frames = 0;
@ -344,8 +364,8 @@ gst_decklink_src_set_property (GObject * object, guint property_id,
decklinksrc->audio_connection =
(GstDecklinkAudioConnectionEnum) g_value_get_enum (value);
break;
case PROP_SUBDEVICE:
decklinksrc->subdevice = g_value_get_int (value);
case PROP_DEVICE:
decklinksrc->device = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
@ -372,8 +392,8 @@ gst_decklink_src_get_property (GObject * object, guint property_id,
case PROP_AUDIO_INPUT:
g_value_set_enum (value, decklinksrc->audio_connection);
break;
case PROP_SUBDEVICE:
g_value_set_int (value, decklinksrc->subdevice);
case PROP_DEVICE:
g_value_set_int (value, decklinksrc->device);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
@ -516,7 +536,7 @@ gst_decklink_src_start (GstElement * element)
GST_ERROR ("no card");
return FALSE;
}
for (i = 0; i < decklinksrc->subdevice; i++) {
for (i = 0; i < decklinksrc->device; i++) {
ret = iterator->Next (&decklinksrc->decklink);
if (ret != S_OK) {
GST_ERROR ("no card");
@ -1285,3 +1305,124 @@ gst_decklink_src_task (void *priv)
}
audio_frame->Release ();
}
static const GList *
gst_decklinksrc_probe_get_properties (GstPropertyProbe * probe)
{
GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
static GList *list = NULL;
static gsize init = 0;
if (g_once_init_enter (&init)) {
list =
g_list_append (NULL, g_object_class_find_property (klass, "device"));
g_once_init_leave (&init, 1);
}
return list;
}
static gboolean probed = FALSE;
int n_devices;
static void
gst_decklinksrc_class_probe_devices (GstElementClass * klass)
{
IDeckLinkIterator *iterator;
IDeckLink *decklink;
n_devices = 0;
iterator = CreateDeckLinkIteratorInstance ();
if (iterator) {
while (iterator->Next (&decklink) == S_OK) {
n_devices++;
}
}
probed = TRUE;
}
static void
gst_decklinksrc_probe_probe_property (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
switch (prop_id) {
case PROP_DEVICE:
gst_decklinksrc_class_probe_devices (klass);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
}
static gboolean
gst_decklinksrc_probe_needs_probe (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
gboolean ret = FALSE;
switch (prop_id) {
case PROP_DEVICE:
ret = !probed;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return ret;
}
static GValueArray *
gst_decklinksrc_class_list_devices (GstElementClass * klass)
{
GValueArray *array;
GValue value = { 0 };
GList *item;
int i;
array = g_value_array_new (n_devices);
g_value_init (&value, G_TYPE_INT);
for (i = 0; i < n_devices; i++) {
g_value_set_int (&value, i);
g_value_array_append (array, &value);
item = item->next;
}
g_value_unset (&value);
return array;
}
static GValueArray *
gst_decklinksrc_probe_get_values (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
GValueArray *array = NULL;
switch (prop_id) {
case PROP_DEVICE:
array = gst_decklinksrc_class_list_devices (klass);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return array;
}
static void
gst_decklinksrc_property_probe_interface_init (GstPropertyProbeInterface *
iface)
{
iface->get_properties = gst_decklinksrc_probe_get_properties;
iface->probe_property = gst_decklinksrc_probe_probe_property;
iface->needs_probe = gst_decklinksrc_probe_needs_probe;
iface->get_values = gst_decklinksrc_probe_get_values;
}

2
sys/decklink/gstdecklinksrc.h
View file

@ -73,7 +73,7 @@ struct _GstDecklinkSrc
GstDecklinkModeEnum mode;
GstDecklinkConnectionEnum connection;
GstDecklinkAudioConnectionEnum audio_connection;
int subdevice;
int device;
#ifdef _MSC_VER
gboolean comInitialized;