uvch264: Implement device provider

sys/uvch264/gstuvch264.c

@@ -29,6 +29,9 @@
 #include "gstuvch264_mjpgdemux.h"
 #include "gstuvch264_src.h"
 
+extern GType gst_uvc_h264_device_provider_get_type ();
+
+
 static gboolean
 plugin_init (GstPlugin * plugin)
 {
@@ -40,6 +43,10 @@ plugin_init (GstPlugin * plugin)
           GST_TYPE_UVC_H264_SRC))
     return FALSE;
 
+  if (!gst_device_provider_register (plugin, "uvch264deviceprovider",
+          GST_RANK_PRIMARY, gst_uvc_h264_device_provider_get_type ()))
+    return FALSE;
+
   return TRUE;
 }
 

sys/uvch264/gstuvch264deviceprovider.c

@@ -0,0 +1,325 @@
+/* GStreamer
+ * Copyright (C) 2019 Thibault Saunier <tsaunier@igalia.com>
+ *
+ * gstuvc_h264deviceprovider.c: UvcH264 device probing and monitoring
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:provider-uvch264deviceprovider
+ *
+ * Device provider for uvch264 devices, it basically contains
+ * the same informations as the v4l2 device provider but on top
+ * set the following properties:
+ *
+ * ```
+ *   device.api=uvch264
+ *   device.is-camerasrc=TRUE
+ * ```
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "uvc_h264.h"
+#include <gst/gst.h>
+
+enum
+{
+  PROP_DEVICE_PATH = 1,
+};
+
+/* *INDENT-OFF* */
+
+G_DECLARE_FINAL_TYPE (GstUvcH264Device, gst_uvc_h264_device, GST_,
+    UVC_H264_DEVICE, GstDevice)
+
+struct _GstUvcH264Device
+{
+  GstDevice parent;
+  gchar *device_path;
+};
+
+G_DEFINE_TYPE (GstUvcH264Device, gst_uvc_h264_device, GST_TYPE_DEVICE);
+/* *INDENT-ON* */
+
+static void
+gst_uvc_h264_device_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstUvcH264Device *self = (GstUvcH264Device *) 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 GstElement *
+gst_uvc_h264_device_create_element (GstDevice * device, const gchar * name)
+{
+  GstUvcH264Device *self = (GstUvcH264Device *) device;
+  GstElement *elem;
+
+  elem = gst_element_factory_make ("uvch264src", name);
+  g_object_set (elem, "device", self->device_path, NULL);
+
+  return elem;
+}
+
+static void
+gst_uvc_h264_device_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstUvcH264Device *self = (GstUvcH264Device *) 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;
+  }
+}
+
+static void
+gst_uvc_h264_device_finalize (GObject * object)
+{
+  GstUvcH264Device *self = (GstUvcH264Device *) object;
+
+  g_free (self->device_path);
+
+  G_OBJECT_CLASS (gst_uvc_h264_device_parent_class)->finalize (object);
+}
+
+static void
+gst_uvc_h264_device_class_init (GstUvcH264DeviceClass * klass)
+{
+  GstDeviceClass *dev_class = GST_DEVICE_CLASS (klass);
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  dev_class->create_element = gst_uvc_h264_device_create_element;
+
+  object_class->get_property = gst_uvc_h264_device_get_property;
+  object_class->set_property = gst_uvc_h264_device_set_property;
+  object_class->finalize = gst_uvc_h264_device_finalize;
+
+  g_object_class_install_property (object_class, PROP_DEVICE_PATH,
+      g_param_spec_string ("device-path", "Device Path",
+          "The Path of the device node", "",
+          G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+gst_uvc_h264_device_init (GstUvcH264Device * device)
+{
+}
+
+
+/* *INDENT-OFF* */
+G_DECLARE_FINAL_TYPE (GstUvcH264DeviceProvider, gst_uvc_h264_device_provider, GST, UVC_H264_DEVICE_PROVIDER, GstDeviceProvider)
+
+struct _GstUvcH264DeviceProvider
+{
+  GstDeviceProvider parent;
+  GstDeviceProvider *v4l2;
+
+  guint bus_watch_id;
+  libusb_context *usb_ctx;
+};
+
+G_DEFINE_TYPE (GstUvcH264DeviceProvider, gst_uvc_h264_device_provider,
+    GST_TYPE_DEVICE_PROVIDER);
+/* *INDENT-ON* */
+
+static GstDevice *
+create_device (GstUvcH264DeviceProvider * self, GstDevice * v4l2dev)
+{
+  GstDevice *dev = NULL;
+  GstStructure *props = gst_device_get_properties (v4l2dev);
+  const gchar *devname = gst_structure_get_string (props, "device.path");
+  gchar *tmp, *device_name = NULL;
+  GstCaps *caps;
+
+  if (!xu_get_id (GST_OBJECT (self), devname, &self->usb_ctx)) {
+    GST_INFO_OBJECT (self, "%s is not a uvch264 device", devname);
+    goto done;
+  }
+
+  gst_structure_set (props, "device.api", G_TYPE_STRING, "uvch264",
+      "device.is-camerasrc", G_TYPE_BOOLEAN, TRUE, NULL);
+
+  caps = gst_device_get_caps (v4l2dev);
+  tmp = gst_device_get_display_name (v4l2dev);
+  device_name = g_strdup_printf ("UvcH264 %s", tmp);
+  g_free (tmp);
+  dev = g_object_new (gst_uvc_h264_device_get_type (), "device-path", devname,
+      "display-name", device_name, "caps", caps, "device-class",
+      "Video/CameraSource", "properties", props, NULL);
+  if (caps)
+    gst_caps_unref (caps);
+
+done:
+  g_free (device_name);
+  gst_structure_free (props);
+
+  return dev;
+}
+
+static GList *
+gst_uvc_h264_device_provider_probe (GstDeviceProvider * provider)
+{
+  GList *tmp, *v4l2devs, *devs = NULL;
+  GstUvcH264DeviceProvider *self = (GstUvcH264DeviceProvider *) provider;
+
+  if (!self->v4l2)
+    self->v4l2 = gst_device_provider_factory_get_by_name ("v4l2deviceprovider");
+
+  if (!self->v4l2)
+    return NULL;
+
+  v4l2devs = gst_device_provider_get_devices (self->v4l2);
+  for (tmp = v4l2devs; tmp; tmp = tmp->next) {
+    GstDevice *dev = create_device (self, tmp->data);
+
+    if (dev)
+      devs = g_list_prepend (devs, dev);
+  }
+  g_list_free_full (v4l2devs, gst_object_unref);
+
+  return devs;
+}
+
+static void
+_bus_message_cb (GstBus * bus, GstMessage * msg,
+    GstUvcH264DeviceProvider * self)
+{
+  GstDevice *v4l2dev;
+  GstDeviceProvider *provider = (GstDeviceProvider *) self;
+
+  if (GST_MESSAGE_SRC (msg) != GST_OBJECT (self->v4l2))
+    return;
+
+  switch (GST_MESSAGE_TYPE (msg)) {
+    case GST_MESSAGE_DEVICE_ADDED:
+    {
+      GstDevice *dev;
+      gst_message_parse_device_added (msg, &v4l2dev);
+
+      if ((dev = create_device (self, v4l2dev)))
+        gst_device_provider_device_add (provider, dev);
+
+      break;
+    }
+    case GST_MESSAGE_DEVICE_REMOVED:
+    {
+      GList *item;
+      gchar *v4l2path;
+      GstDevice *dev = NULL;
+
+      gst_message_parse_device_removed (msg, &v4l2dev);
+
+      g_object_get (v4l2dev, "device-path", &v4l2path, NULL);
+
+      GST_OBJECT_LOCK (self);
+      for (item = provider->devices; item; item = item->next) {
+        if (!g_strcmp0 (((GstUvcH264Device *) item->data)->device_path,
+                v4l2path)) {
+          dev = item->data;
+          break;
+        }
+      }
+      GST_OBJECT_UNLOCK (self);
+
+      if (dev)
+        gst_device_provider_device_remove (provider, dev);
+      break;
+    }
+    default:
+      break;
+  }
+
+}
+
+static gboolean
+gst_uvc_h264_device_provider_start (GstDeviceProvider * provider)
+{
+  GstBus *bus;
+  GstUvcH264DeviceProvider *self = (GstUvcH264DeviceProvider *) provider;
+  GList *tmp, *devs = gst_uvc_h264_device_provider_probe (provider);
+  if (!self->v4l2)
+    return TRUE;
+
+  bus = gst_device_provider_get_bus (self->v4l2);
+  gst_bus_enable_sync_message_emission (bus);
+  self->bus_watch_id = g_signal_connect (bus, "sync-message",
+      G_CALLBACK (_bus_message_cb), self);
+  gst_object_unref (bus);
+
+  for (tmp = devs; tmp; tmp = tmp->next)
+    gst_device_provider_device_add (provider, tmp->data);
+  g_list_free (devs);
+
+  return TRUE;
+}
+
+static void
+gst_uvc_h264_device_provider_stop (GstDeviceProvider * provider)
+{
+  GstBus *bus;
+  GstUvcH264DeviceProvider *self = (GstUvcH264DeviceProvider *) provider;
+
+  if (!self->v4l2)
+    return;
+
+  if (self->usb_ctx)
+    libusb_exit (self->usb_ctx);
+  self->usb_ctx = NULL;
+
+  bus = gst_device_provider_get_bus (self->v4l2);
+  g_signal_handler_disconnect (bus, self->bus_watch_id);
+  self->bus_watch_id = 0;
+  gst_clear_object (&self->v4l2);
+  gst_clear_object (&bus);
+
+  return;
+}
+
+static void
+gst_uvc_h264_device_provider_class_init (GstUvcH264DeviceProviderClass * klass)
+{
+  GstDeviceProviderClass *dm_class = GST_DEVICE_PROVIDER_CLASS (klass);
+
+  dm_class->probe = gst_uvc_h264_device_provider_probe;
+  dm_class->start = gst_uvc_h264_device_provider_start;
+  dm_class->stop = gst_uvc_h264_device_provider_stop;
+
+  gst_device_provider_class_set_static_metadata (dm_class,
+      "UVC H.264 Device Provider", "Video/CameraSource",
+      "List and provides UVC H.264 source devices",
+      "Thibault Saunier <tsaunier@igalia.com>");
+}
+
+static void
+gst_uvc_h264_device_provider_init (GstUvcH264DeviceProvider * self)
+{
+}

sys/uvch264/meson.build

@@ -2,6 +2,7 @@ uvch264_sources = [
   'gstuvch264.c',
   'gstuvch264_mjpgdemux.c',
   'gstuvch264_src.c',
+  'gstuvch264deviceprovider.c',
   'uvc_h264.c',
 ]