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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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320 lines
8.3 KiB
C
320 lines
8.3 KiB
C
/* GStreamer
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* Copyright (C) 2019 Thibault Saunier <tsaunier@igalia.com>
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*
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* gstuvc_h264deviceprovider.c: UvcH264 device probing and monitoring
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:provider-uvch264deviceprovider
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*
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* Device provider for uvch264 devices, it basically contains
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* the same information as the v4l2 device provider but on top
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* set the following properties:
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*
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* ```
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* device.api=uvch264
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* device.is-camerasrc=TRUE
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* ```
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "uvc_h264.h"
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#include <gst/gst.h>
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#include "gstuvch264deviceprovider.h"
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enum
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{
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PROP_DEVICE_PATH = 1,
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};
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/* *INDENT-OFF* */
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struct _GstUvcH264Device
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{
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GstDevice parent;
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gchar *device_path;
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};
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G_DEFINE_TYPE (GstUvcH264Device, gst_uvc_h264_device, GST_TYPE_DEVICE);
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/* *INDENT-ON* */
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static void
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gst_uvc_h264_device_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstUvcH264Device *self = (GstUvcH264Device *) object;
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switch (prop_id) {
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case PROP_DEVICE_PATH:
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g_value_set_string (value, self->device_path);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstElement *
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gst_uvc_h264_device_create_element (GstDevice * device, const gchar * name)
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{
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GstUvcH264Device *self = (GstUvcH264Device *) device;
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GstElement *elem;
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elem = gst_element_factory_make ("uvch264src", name);
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g_object_set (elem, "device", self->device_path, NULL);
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return elem;
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}
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static void
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gst_uvc_h264_device_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstUvcH264Device *self = (GstUvcH264Device *) object;
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switch (prop_id) {
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case PROP_DEVICE_PATH:
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self->device_path = g_value_dup_string (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_uvc_h264_device_finalize (GObject * object)
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{
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GstUvcH264Device *self = (GstUvcH264Device *) object;
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g_free (self->device_path);
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G_OBJECT_CLASS (gst_uvc_h264_device_parent_class)->finalize (object);
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}
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static void
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gst_uvc_h264_device_class_init (GstUvcH264DeviceClass * klass)
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{
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GstDeviceClass *dev_class = GST_DEVICE_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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dev_class->create_element = gst_uvc_h264_device_create_element;
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object_class->get_property = gst_uvc_h264_device_get_property;
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object_class->set_property = gst_uvc_h264_device_set_property;
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object_class->finalize = gst_uvc_h264_device_finalize;
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g_object_class_install_property (object_class, PROP_DEVICE_PATH,
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g_param_spec_string ("device-path", "Device Path",
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"The Path of the device node", "",
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G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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}
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static void
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gst_uvc_h264_device_init (GstUvcH264Device * device)
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{
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}
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/* *INDENT-OFF* */
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struct _GstUvcH264DeviceProvider
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{
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GstDeviceProvider parent;
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GstDeviceProvider *v4l2;
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guint bus_watch_id;
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libusb_context *usb_ctx;
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};
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G_DEFINE_TYPE (GstUvcH264DeviceProvider, gst_uvc_h264_device_provider,
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GST_TYPE_DEVICE_PROVIDER);
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/* *INDENT-ON* */
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static GstDevice *
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create_device (GstUvcH264DeviceProvider * self, GstDevice * v4l2dev)
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{
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GstDevice *dev = NULL;
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GstStructure *props = gst_device_get_properties (v4l2dev);
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const gchar *devname = gst_structure_get_string (props, "device.path");
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gchar *tmp, *device_name = NULL;
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GstCaps *caps;
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if (!xu_get_id (GST_OBJECT (self), devname, &self->usb_ctx)) {
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GST_INFO_OBJECT (self, "%s is not a uvch264 device", devname);
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goto done;
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}
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gst_structure_set (props, "device.api", G_TYPE_STRING, "uvch264",
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"device.is-camerasrc", G_TYPE_BOOLEAN, TRUE, NULL);
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caps = gst_device_get_caps (v4l2dev);
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tmp = gst_device_get_display_name (v4l2dev);
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device_name = g_strdup_printf ("UvcH264 %s", tmp);
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g_free (tmp);
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dev = g_object_new (gst_uvc_h264_device_get_type (), "device-path", devname,
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"display-name", device_name, "caps", caps, "device-class",
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"Video/CameraSource", "properties", props, NULL);
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if (caps)
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gst_caps_unref (caps);
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done:
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g_free (device_name);
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gst_structure_free (props);
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return dev;
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}
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static GList *
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gst_uvc_h264_device_provider_probe (GstDeviceProvider * provider)
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{
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GList *tmp, *v4l2devs, *devs = NULL;
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GstUvcH264DeviceProvider *self = (GstUvcH264DeviceProvider *) provider;
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if (!self->v4l2)
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self->v4l2 = gst_device_provider_factory_get_by_name ("v4l2deviceprovider");
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if (!self->v4l2)
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return NULL;
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v4l2devs = gst_device_provider_get_devices (self->v4l2);
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for (tmp = v4l2devs; tmp; tmp = tmp->next) {
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GstDevice *dev = create_device (self, tmp->data);
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if (dev)
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devs = g_list_prepend (devs, dev);
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}
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g_list_free_full (v4l2devs, gst_object_unref);
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return devs;
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}
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static void
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_bus_message_cb (GstBus * bus, GstMessage * msg,
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GstUvcH264DeviceProvider * self)
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{
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GstDevice *v4l2dev;
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GstDeviceProvider *provider = (GstDeviceProvider *) self;
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if (GST_MESSAGE_SRC (msg) != GST_OBJECT (self->v4l2))
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return;
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_DEVICE_ADDED:
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{
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GstDevice *dev;
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gst_message_parse_device_added (msg, &v4l2dev);
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if ((dev = create_device (self, v4l2dev)))
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gst_device_provider_device_add (provider, dev);
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break;
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}
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case GST_MESSAGE_DEVICE_REMOVED:
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{
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GList *item;
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gchar *v4l2path;
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GstDevice *dev = NULL;
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gst_message_parse_device_removed (msg, &v4l2dev);
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g_object_get (v4l2dev, "device-path", &v4l2path, NULL);
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GST_OBJECT_LOCK (self);
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for (item = provider->devices; item; item = item->next) {
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if (!g_strcmp0 (((GstUvcH264Device *) item->data)->device_path,
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v4l2path)) {
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dev = item->data;
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break;
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}
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}
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GST_OBJECT_UNLOCK (self);
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if (dev)
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gst_device_provider_device_remove (provider, dev);
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break;
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}
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default:
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break;
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}
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}
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static gboolean
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gst_uvc_h264_device_provider_start (GstDeviceProvider * provider)
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{
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GstBus *bus;
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GstUvcH264DeviceProvider *self = (GstUvcH264DeviceProvider *) provider;
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GList *tmp, *devs = gst_uvc_h264_device_provider_probe (provider);
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if (!self->v4l2)
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return TRUE;
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bus = gst_device_provider_get_bus (self->v4l2);
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gst_bus_enable_sync_message_emission (bus);
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self->bus_watch_id = g_signal_connect (bus, "sync-message",
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G_CALLBACK (_bus_message_cb), self);
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gst_object_unref (bus);
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for (tmp = devs; tmp; tmp = tmp->next)
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gst_device_provider_device_add (provider, tmp->data);
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g_list_free (devs);
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return TRUE;
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}
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static void
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gst_uvc_h264_device_provider_stop (GstDeviceProvider * provider)
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{
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GstBus *bus;
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GstUvcH264DeviceProvider *self = (GstUvcH264DeviceProvider *) provider;
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if (!self->v4l2)
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return;
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if (self->usb_ctx)
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libusb_exit (self->usb_ctx);
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self->usb_ctx = NULL;
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bus = gst_device_provider_get_bus (self->v4l2);
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g_signal_handler_disconnect (bus, self->bus_watch_id);
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self->bus_watch_id = 0;
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gst_clear_object (&self->v4l2);
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gst_clear_object (&bus);
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return;
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}
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static void
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gst_uvc_h264_device_provider_class_init (GstUvcH264DeviceProviderClass * klass)
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{
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GstDeviceProviderClass *dm_class = GST_DEVICE_PROVIDER_CLASS (klass);
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dm_class->probe = gst_uvc_h264_device_provider_probe;
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dm_class->start = gst_uvc_h264_device_provider_start;
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dm_class->stop = gst_uvc_h264_device_provider_stop;
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gst_device_provider_class_set_static_metadata (dm_class,
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"UVC H.264 Device Provider", "Video/CameraSource",
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"List and provides UVC H.264 source devices",
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"Thibault Saunier <tsaunier@igalia.com>");
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}
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static void
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gst_uvc_h264_device_provider_init (GstUvcH264DeviceProvider * self)
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{
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}
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