mediafoundation: Add device provider implementation

Only static device probing is supported for now

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1236>

sys/mediafoundation/gstmfdevice.c

@@ -0,0 +1,234 @@
+/* GStreamer
+ * Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstmfconfig.h"
+
+#include "gstmfvideosrc.h"
+#include "gstmfutils.h"
+#include "gstmfsourcereader.h"
+#if HAVE_CAPTURE_ENGINE
+#include "gstmfcaptureengine.h"
+#endif
+
+#include "gstmfdevice.h"
+
+GST_DEBUG_CATEGORY_EXTERN (gst_mf_debug);
+#define GST_CAT_DEFAULT gst_mf_debug
+
+enum
+{
+  PROP_0,
+  PROP_DEVICE_PATH,
+};
+
+struct _GstMFDevice
+{
+  GstDevice parent;
+
+  gchar *device_path;
+};
+
+G_DEFINE_TYPE (GstMFDevice, gst_mf_device, GST_TYPE_DEVICE);
+
+static void gst_mf_device_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec);
+static void gst_mf_device_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_mf_device_finalize (GObject * object);
+static GstElement *gst_mf_device_create_element (GstDevice * device,
+    const gchar * name);
+
+static void
+gst_mf_device_class_init (GstMFDeviceClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstDeviceClass *dev_class = GST_DEVICE_CLASS (klass);
+
+  dev_class->create_element = gst_mf_device_create_element;
+
+  gobject_class->get_property = gst_mf_device_get_property;
+  gobject_class->set_property = gst_mf_device_set_property;
+  gobject_class->finalize = gst_mf_device_finalize;
+
+  g_object_class_install_property (gobject_class, PROP_DEVICE_PATH,
+      g_param_spec_string ("device-path", "Device Path",
+          "The device path", NULL,
+          G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
+}
+
+static void
+gst_mf_device_init (GstMFDevice * self)
+{
+}
+
+static void
+gst_mf_device_finalize (GObject * object)
+{
+  GstMFDevice *self = GST_MF_DEVICE (object);
+
+  g_free (self->device_path);
+
+  G_OBJECT_CLASS (gst_mf_device_parent_class)->finalize (object);
+}
+
+static GstElement *
+gst_mf_device_create_element (GstDevice * device, const gchar * name)
+{
+  GstMFDevice *self = GST_MF_DEVICE (device);
+  GstElement *elem;
+
+  elem = gst_element_factory_make ("mfvideosrc", name);
+
+  g_object_set (elem, "device-path", self->device_path, NULL);
+
+  return elem;
+}
+
+static void
+gst_mf_device_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstMFDevice *self = GST_MF_DEVICE (object);
+
+  switch (prop_id) {
+    case PROP_DEVICE_PATH:
+      g_value_set_string (value, self->device_path);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_mf_device_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstMFDevice *self = GST_MF_DEVICE (object);
+
+  switch (prop_id) {
+    case PROP_DEVICE_PATH:
+      self->device_path = g_value_dup_string (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+struct _GstMFDeviceProvider
+{
+  GstDeviceProvider parent;
+};
+
+G_DEFINE_TYPE (GstMFDeviceProvider, gst_mf_device_provider,
+    GST_TYPE_DEVICE_PROVIDER);
+
+static GList *gst_mf_device_provider_probe (GstDeviceProvider * provider);
+
+static void
+gst_mf_device_provider_class_init (GstMFDeviceProviderClass * klass)
+{
+  GstDeviceProviderClass *provider_class = GST_DEVICE_PROVIDER_CLASS (klass);
+
+  provider_class->probe = GST_DEBUG_FUNCPTR (gst_mf_device_provider_probe);
+
+  gst_device_provider_class_set_static_metadata (provider_class,
+      "Media Foundation Device Provider",
+      "Source/Video", "List Media Foundation source devices",
+      "Seungha Yang <seungha@centricular.com>");
+}
+
+static void
+gst_mf_device_provider_init (GstMFDeviceProvider * provider)
+{
+}
+
+static GList *
+gst_mf_device_provider_probe (GstDeviceProvider * provider)
+{
+  GstMFDeviceProvider *self = GST_MF_DEVICE_PROVIDER (provider);
+  GList *list = NULL;
+  gint i;
+
+  for (i = 0;; i++) {
+    GstMFSourceObject *obj = NULL;
+    GstDevice *device;
+    GstStructure *props = NULL;
+    GstCaps *caps = NULL;
+    gchar *device_name = NULL;
+    gchar *device_path = NULL;
+
+
+#if HAVE_CAPTURE_ENGINE
+    obj = gst_mf_capture_engine_new (GST_MF_SOURCE_TYPE_VIDEO, i, NULL, NULL);
+#endif
+
+    if (!obj)
+      obj = gst_mf_source_reader_new (GST_MF_SOURCE_TYPE_VIDEO, i, NULL, NULL);
+
+    if (!obj)
+      break;
+
+    caps = gst_mf_source_object_get_caps (obj);
+    if (!caps) {
+      GST_WARNING_OBJECT (self, "Empty caps for device index %d", i);
+      goto next;
+    }
+
+    g_object_get (obj,
+        "device-path", &device_path, "device-name", &device_name, NULL);
+
+    if (!device_path) {
+      GST_WARNING_OBJECT (self, "Device path is unavailable");
+      goto next;
+    }
+
+    if (!device_name) {
+      GST_WARNING_OBJECT (self, "Device name is unavailable");
+      goto next;
+    }
+
+    props = gst_structure_new ("mf-proplist",
+        "device.api", G_TYPE_STRING, "mediafoundation",
+        "device.path", G_TYPE_STRING, device_path,
+        "device.name", G_TYPE_STRING, device_name, NULL);
+
+    device = g_object_new (GST_TYPE_MF_DEVICE, "device-path", device_path,
+        "display-name", device_name, "caps", caps,
+        "device-class", "Source/Video", "properties", props, NULL);
+
+    list = g_list_append (list, device);
+
+  next:
+    if (caps)
+      gst_caps_unref (caps);
+    if (props)
+      gst_structure_free (props);
+    g_free (device_path);
+    g_free (device_name);
+    gst_object_unref (obj);
+  }
+
+  return list;
+}

sys/mediafoundation/gstmfdevice.h

@@ -0,0 +1,39 @@
+/* GStreamer
+ * Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_MF_DEVICE_H__
+#define __GST_MF_DEVICE_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_MF_DEVICE          (gst_mf_device_get_type())
+#define GST_TYPE_MF_DEVICE_PROVIDER (gst_mf_device_provider_get_type())
+
+G_DECLARE_FINAL_TYPE (GstMFDevice, gst_mf_device, GST, MF_DEVICE, GstDevice);
+G_DECLARE_FINAL_TYPE (GstMFDeviceProvider,
+    gst_mf_device_provider, GST, MF_DEVICE_PROVIDER, GstDeviceProvider);
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstMFDevice, gst_object_unref)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstMFDeviceProvider, gst_object_unref)
+
+G_END_DECLS
+
+#endif /* __GST_MF_DEVICE_H__ */

sys/mediafoundation/meson.build

@@ -11,6 +11,7 @@ mf_desktop_sources = [
   'gstmfvideosrc.c',
   'gstmfsourceobject.c',
   'gstmfsourcereader.cpp',
+  'gstmfdevice.c'
 ]
 
 mf_header_deps = [

sys/mediafoundation/plugin.c

@@ -27,6 +27,7 @@
 #include <gst/gst.h>
 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
 #include "gstmfvideosrc.h"
+#include "gstmfdevice.h"
 #endif
 #include "gstmfutils.h"
 #include "gstmfh264enc.h"
@@ -64,6 +65,8 @@ plugin_init (GstPlugin * plugin)
 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
   gst_element_register (plugin,
       "mfvideosrc", GST_RANK_SECONDARY, GST_TYPE_MF_VIDEO_SRC);
+  gst_device_provider_register (plugin, "mfdeviceprovider",
+      GST_RANK_SECONDARY, GST_TYPE_MF_DEVICE_PROVIDER);
 #endif
 
   gst_mf_h264_enc_plugin_init (plugin, GST_RANK_SECONDARY);