gstreamer/gst-libs/gst/vaapi/gstvaapidisplay_drm.c

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/*
* gstvaapidisplay_drm.c - VA/DRM display abstraction
*
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* Copyright (C) 2012-2013 Intel Corporation
* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
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*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:gstvaapidisplay_drm
* @short_description: VA/DRM display abstraction
*/
#include "sysdeps.h"
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <libudev.h>
#include <xf86drm.h>
#include <va/va_drm.h>
#include "gstvaapiutils.h"
#include "gstvaapidisplay_priv.h"
#include "gstvaapidisplay_drm.h"
#include "gstvaapidisplay_drm_priv.h"
#define DEBUG 1
#include "gstvaapidebug.h"
static const guint g_display_types = 1U << GST_VAAPI_DISPLAY_TYPE_DRM;
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/* Get default device path. Actually, the first match in the DRM subsystem */
static const gchar *
get_default_device_path (GstVaapiDisplay * display)
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{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
const gchar *syspath, *devpath;
struct udev *udev = NULL;
struct udev_device *device, *parent;
struct udev_enumerate *e = NULL;
struct udev_list_entry *l;
int fd;
if (!priv->device_path_default) {
udev = udev_new ();
if (!udev)
goto end;
e = udev_enumerate_new (udev);
if (!e)
goto end;
udev_enumerate_add_match_subsystem (e, "drm");
udev_enumerate_scan_devices (e);
udev_list_entry_foreach (l, udev_enumerate_get_list_entry (e)) {
syspath = udev_list_entry_get_name (l);
device = udev_device_new_from_syspath (udev, syspath);
parent = udev_device_get_parent (device);
if (strcmp (udev_device_get_subsystem (parent), "pci") != 0) {
udev_device_unref (device);
continue;
}
devpath = udev_device_get_devnode (device);
fd = open (devpath, O_RDWR | O_CLOEXEC);
if (fd < 0) {
udev_device_unref (device);
continue;
}
priv->device_path_default = g_strdup (devpath);
close (fd);
udev_device_unref (device);
break;
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}
end:
if (e)
udev_enumerate_unref (e);
if (udev)
udev_unref (udev);
}
return priv->device_path_default;
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}
/* Reconstruct a device path without our prefix */
static const gchar *
get_device_path (GstVaapiDisplay * display)
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{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
const gchar *device_path = priv->device_path;
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if (!device_path || *device_path == '\0')
return NULL;
return device_path;
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}
/* Mangle device path with our prefix */
static gboolean
set_device_path (GstVaapiDisplay * display, const gchar * device_path)
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{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
g_free (priv->device_path);
priv->device_path = NULL;
if (!device_path) {
device_path = get_default_device_path (display);
if (!device_path)
return FALSE;
}
priv->device_path = g_strdup (device_path);
return priv->device_path != NULL;
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}
/* Set device path from file descriptor */
static gboolean
set_device_path_from_fd (GstVaapiDisplay * display, gint drm_device)
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{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
const gchar *busid, *path, *str;
gsize busid_length, path_length;
struct udev *udev = NULL;
struct udev_device *device;
struct udev_enumerate *e = NULL;
struct udev_list_entry *l;
gboolean success = FALSE;
g_free (priv->device_path);
priv->device_path = NULL;
if (drm_device < 0)
goto end;
busid = drmGetBusid (drm_device);
if (!busid)
goto end;
if (strncmp (busid, "pci:", 4) != 0)
goto end;
busid += 4;
busid_length = strlen (busid);
udev = udev_new ();
if (!udev)
goto end;
e = udev_enumerate_new (udev);
if (!e)
goto end;
udev_enumerate_add_match_subsystem (e, "drm");
udev_enumerate_scan_devices (e);
udev_list_entry_foreach (l, udev_enumerate_get_list_entry (e)) {
path = udev_list_entry_get_name (l);
str = strstr (path, busid);
if (!str || str <= path || str[-1] != '/')
continue;
path_length = strlen (path);
if (str + busid_length >= path + path_length)
continue;
if (strncmp (&str[busid_length], "/drm/card", 9) != 0)
continue;
device = udev_device_new_from_syspath (udev, path);
if (!device)
continue;
path = udev_device_get_devnode (device);
priv->device_path = g_strdup (path);
udev_device_unref (device);
break;
}
success = TRUE;
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end:
if (e)
udev_enumerate_unref (e);
if (udev)
udev_unref (udev);
return success;
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}
static gboolean
gst_vaapi_display_drm_bind_display (GstVaapiDisplay * display,
gpointer native_display)
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{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
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priv->drm_device = GPOINTER_TO_INT (native_display);
priv->use_foreign_display = TRUE;
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if (!set_device_path_from_fd (display, priv->drm_device))
return FALSE;
return TRUE;
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}
static gboolean
gst_vaapi_display_drm_open_display (GstVaapiDisplay * display,
const gchar * name)
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{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
GstVaapiDisplayCache *const cache = GST_VAAPI_DISPLAY_GET_CACHE (display);
const GstVaapiDisplayInfo *info;
if (!set_device_path (display, name))
return FALSE;
info = gst_vaapi_display_cache_lookup_by_name (cache, priv->device_path,
GST_VAAPI_DISPLAY_TYPES (display));
if (info) {
priv->drm_device = GPOINTER_TO_INT (info->native_display);
priv->use_foreign_display = TRUE;
} else {
priv->drm_device = open (get_device_path (display), O_RDWR | O_CLOEXEC);
if (priv->drm_device < 0)
return FALSE;
priv->use_foreign_display = FALSE;
}
return TRUE;
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}
static void
gst_vaapi_display_drm_close_display (GstVaapiDisplay * display)
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{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
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if (priv->drm_device >= 0) {
if (!priv->use_foreign_display)
close (priv->drm_device);
priv->drm_device = -1;
}
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if (priv->device_path) {
g_free (priv->device_path);
priv->device_path = NULL;
}
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if (priv->device_path_default) {
g_free (priv->device_path_default);
priv->device_path_default = NULL;
}
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}
static gboolean
gst_vaapi_display_drm_get_display_info (GstVaapiDisplay * display,
GstVaapiDisplayInfo * info)
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{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
GstVaapiDisplayCache *const cache = GST_VAAPI_DISPLAY_GET_CACHE (display);
const GstVaapiDisplayInfo *cached_info;
/* Return any cached info even if child has its own VA display */
cached_info = gst_vaapi_display_cache_lookup_by_native_display (cache,
GINT_TO_POINTER (priv->drm_device), GST_VAAPI_DISPLAY_TYPES (display));
if (cached_info) {
*info = *cached_info;
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return TRUE;
}
/* Otherwise, create VA display if there is none already */
info->native_display = GINT_TO_POINTER (priv->drm_device);
info->display_name = priv->device_path;
if (!info->va_display) {
info->va_display = vaGetDisplayDRM (priv->drm_device);
if (!info->va_display)
return FALSE;
info->display_type = GST_VAAPI_DISPLAY_TYPE_DRM;
}
return TRUE;
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}
static void
gst_vaapi_display_drm_init (GstVaapiDisplay * display)
{
GstVaapiDisplayDRMPrivate *const priv =
GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
priv->drm_device = -1;
}
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static void
gst_vaapi_display_drm_class_init (GstVaapiDisplayDRMClass * klass)
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{
GstVaapiMiniObjectClass *const object_class =
GST_VAAPI_MINI_OBJECT_CLASS (klass);
GstVaapiDisplayClass *const dpy_class = GST_VAAPI_DISPLAY_CLASS (klass);
gst_vaapi_display_class_init (&klass->parent_class);
object_class->size = sizeof (GstVaapiDisplayDRM);
dpy_class->display_types = g_display_types;
dpy_class->init = gst_vaapi_display_drm_init;
dpy_class->bind_display = gst_vaapi_display_drm_bind_display;
dpy_class->open_display = gst_vaapi_display_drm_open_display;
dpy_class->close_display = gst_vaapi_display_drm_close_display;
dpy_class->get_display = gst_vaapi_display_drm_get_display_info;
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}
static inline const GstVaapiDisplayClass *
gst_vaapi_display_drm_class (void)
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{
static GstVaapiDisplayDRMClass g_class;
static gsize g_class_init = FALSE;
if (g_once_init_enter (&g_class_init)) {
gst_vaapi_display_drm_class_init (&g_class);
g_once_init_leave (&g_class_init, TRUE);
}
return GST_VAAPI_DISPLAY_CLASS (&g_class);
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}
/**
* gst_vaapi_display_drm_new:
* @device_path: the DRM device path
*
* Opens an DRM file descriptor using @device_path and returns a newly
* allocated #GstVaapiDisplay object. The DRM display will be cloed
* when the reference count of the object reaches zero.
*
* If @device_path is NULL, the DRM device path will be automatically
* determined as the first positive match in the list of available DRM
* devices.
*
* Return value: a newly allocated #GstVaapiDisplay object
*/
GstVaapiDisplay *
gst_vaapi_display_drm_new (const gchar * device_path)
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{
return gst_vaapi_display_new (gst_vaapi_display_drm_class (),
GST_VAAPI_DISPLAY_INIT_FROM_DISPLAY_NAME, (gpointer) device_path);
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}
/**
* gst_vaapi_display_drm_new_with_device:
* @device: an open DRM device (file descriptor)
*
* Creates a #GstVaapiDisplay based on the open DRM @device. The
* caller still owns the device file descriptor and must call close()
* when all #GstVaapiDisplay references are released. Doing so too
* early can yield undefined behaviour.
*
* Return value: a newly allocated #GstVaapiDisplay object
*/
GstVaapiDisplay *
gst_vaapi_display_drm_new_with_device (gint device)
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{
g_return_val_if_fail (device >= 0, NULL);
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return gst_vaapi_display_new (gst_vaapi_display_drm_class (),
GST_VAAPI_DISPLAY_INIT_FROM_NATIVE_DISPLAY, GINT_TO_POINTER (device));
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}
/**
* gst_vaapi_display_drm_get_device:
* @display: a #GstVaapiDisplayDRM
*
* Returns the underlying DRM device file descriptor that was created
* by gst_vaapi_display_drm_new() or that was bound from
* gst_vaapi_display_drm_new_with_device().
*
* Return value: the DRM file descriptor attached to @display
*/
gint
gst_vaapi_display_drm_get_device (GstVaapiDisplayDRM * display)
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{
g_return_val_if_fail (GST_VAAPI_IS_DISPLAY_DRM (display), -1);
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return GST_VAAPI_DISPLAY_DRM_DEVICE (display);
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}
/**
* gst_vaapi_display_drm_get_device_path:
* @display: a #GstVaapiDisplayDRM
*
* Returns the underlying DRM device path name was created by
* gst_vaapi_display_drm_new() or that was bound from
* gst_vaapi_display_drm_new_with_device().
*
* Note: the #GstVaapiDisplayDRM object owns the resulting string, so
* it shall not be deallocated.
*
* Return value: the DRM device path name attached to @display
*/
const gchar *
gst_vaapi_display_drm_get_device_path (GstVaapiDisplayDRM * display)
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{
g_return_val_if_fail (GST_VAAPI_IS_DISPLAY_DRM (display), NULL);
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return get_device_path (GST_VAAPI_DISPLAY_CAST (display));
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}