gstreamer/subprojects/gst-plugins-bad/gst-libs/gst/va/gstvadisplay_drm.c

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/* GStreamer
* Copyright (C) 2020 Igalia, S.L.
* Author: Víctor Jáquez <vjaquez@igalia.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.
*/
/**
* SECTION:gstvadisplaydrm
* @title: GstVaDisplayDrm
* @short_description: VADisplay from a DRM device
* @sources:
* - gstvadisplay_drm.h
*
* This is a #GstVaDisplay subclass to instantiate with DRM devices.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstvadisplay_drm.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <va/va_drm.h>
#if HAVE_LIBDRM
#include <xf86drm.h>
#endif
/**
* GstVaDisplayDrm:
* @parent: parent #GstVaDisplay
*
* Since: 1.20
*/
struct _GstVaDisplayDrm
{
GstVaDisplay parent;
/* <private> */
gchar *path;
gint fd;
};
/**
* GstVaDisplayDrmClass:
* @parent_class: parent #GstVaDisplayClass
*
* Since: 1.20
*/
struct _GstVaDisplayDrmClass
{
GstVaDisplayClass parent_class;
};
GST_DEBUG_CATEGORY_EXTERN (gst_va_display_debug);
#define GST_CAT_DEFAULT gst_va_display_debug
#define gst_va_display_drm_parent_class parent_class
G_DEFINE_TYPE (GstVaDisplayDrm, gst_va_display_drm, GST_TYPE_VA_DISPLAY);
enum
{
PROP_PATH = 1,
N_PROPERTIES
};
static GParamSpec *g_properties[N_PROPERTIES];
#define MAX_DEVICES 8
static void
gst_va_display_drm_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVaDisplayDrm *self = GST_VA_DISPLAY_DRM (object);
switch (prop_id) {
case PROP_PATH:
self->path = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_va_display_drm_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstVaDisplayDrm *self = GST_VA_DISPLAY_DRM (object);
switch (prop_id) {
case PROP_PATH:
g_value_set_string (value, self->path);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_va_display_drm_finalize (GObject * object)
{
GstVaDisplayDrm *self = GST_VA_DISPLAY_DRM (object);
g_free (self->path);
if (self->fd > -1)
close (self->fd);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gpointer
gst_va_display_drm_create_va_display (GstVaDisplay * display)
{
int fd, saved_errno = 0;
GstVaDisplayDrm *self = GST_VA_DISPLAY_DRM (display);
fd = open (self->path, O_CLOEXEC | O_RDWR);
saved_errno = errno;
if (fd < 0) {
GST_WARNING_OBJECT (self, "Failed to open %s: %s", self->path,
g_strerror (saved_errno));
return 0;
}
#if HAVE_LIBDRM
{
drmVersion *version;
version = drmGetVersion (fd);
if (!version) {
GST_ERROR_OBJECT (self, "Device %s is not a DRM render node", self->path);
return 0;
}
GST_INFO_OBJECT (self, "DRM render node with kernel driver %s",
version->name);
drmFreeVersion (version);
}
#endif
self->fd = fd;
return vaGetDisplayDRM (self->fd);
}
static void
gst_va_display_drm_class_init (GstVaDisplayDrmClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstVaDisplayClass *vadisplay_class = GST_VA_DISPLAY_CLASS (klass);
gobject_class->set_property = gst_va_display_drm_set_property;
gobject_class->get_property = gst_va_display_drm_get_property;
gobject_class->finalize = gst_va_display_drm_finalize;
vadisplay_class->create_va_display = gst_va_display_drm_create_va_display;
g_properties[PROP_PATH] =
g_param_spec_string ("path", "render-path", "The path of DRM device",
"/dev/dri/renderD128",
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_properties (gobject_class, N_PROPERTIES, g_properties);
}
static void
gst_va_display_drm_init (GstVaDisplayDrm * self)
{
self->fd = -1;
}
/**
* gst_va_display_drm_new_from_path:
* @path: the path to the DRM device
*
* Creates a new #GstVaDisplay from a DRM device . It will try to open
* and operate the device in @path.
*
* Returns: (transfer full): a newly allocated #GstVaDisplay if the
* specified DRM render device could be opened and initialized;
* otherwise %NULL is returned.
*
* Since: 1.20
**/
GstVaDisplay *
gst_va_display_drm_new_from_path (const gchar * path)
{
GstVaDisplay *dpy;
g_return_val_if_fail (path, NULL);
dpy = g_object_new (GST_TYPE_VA_DISPLAY_DRM, "path", path, NULL);
if (!gst_va_display_initialize (dpy)) {
gst_object_unref (dpy);
return NULL;
}
return gst_object_ref_sink (dpy);
}