summaryrefslogtreecommitdiff
path: root/gst-libs/gst/vaapi/gstvaapidisplay_drm.c
blob: 95becdb873b8816eb692b7ac1f146777b4126915 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
/*
 *  gstvaapidisplay_drm.c - VA/DRM display abstraction
 *
 *  Copyright (C) 2012-2013 Intel Corporation
 *    Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
 *
 *  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
 */

#define _GNU_SOURCE
#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"
#include "gstvaapiwindow_drm.h"

#define DEBUG_VAAPI_DISPLAY 1
#include "gstvaapidebug.h"

#define _do_init \
    G_ADD_PRIVATE (GstVaapiDisplayDRM);

G_DEFINE_TYPE_WITH_CODE (GstVaapiDisplayDRM, gst_vaapi_display_drm,
    GST_TYPE_VAAPI_DISPLAY, _do_init);

typedef enum
{
  DRM_DEVICE_LEGACY = 1,
  DRM_DEVICE_RENDERNODES,
} DRMDeviceType;

static DRMDeviceType g_drm_device_type;
static GMutex g_drm_device_type_lock;

static gboolean
supports_vaapi (int fd)
{
  gboolean ret;
  VADisplay va_dpy;

  va_dpy = vaGetDisplayDRM (fd);
  if (!va_dpy)
    return FALSE;

  ret = vaapi_initialize (va_dpy);
  vaTerminate (va_dpy);
  return ret;
}

/* Get default device path. Actually, the first match in the DRM subsystem */
static const gchar *
get_default_device_path (GstVaapiDisplay * display)
{
  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");
    switch (g_drm_device_type) {
      case DRM_DEVICE_LEGACY:
        udev_enumerate_add_match_sysname (e, "card[0-9]*");
        break;
      case DRM_DEVICE_RENDERNODES:
        udev_enumerate_add_match_sysname (e, "renderD[0-9]*");
        break;
      default:
        GST_ERROR ("unknown drm device type (%d)", g_drm_device_type);
        goto end;
    }
    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;
      }

      if (supports_vaapi (fd))
        priv->device_path_default = g_strdup (devpath);
      close (fd);
      udev_device_unref (device);
      if (priv->device_path_default)
        break;
    }

  end:
    if (e)
      udev_enumerate_unref (e);
    if (udev)
      udev_unref (udev);
  }
  return priv->device_path_default;
}

/* Reconstruct a device path without our prefix */
static const gchar *
get_device_path (GstVaapiDisplay * display)
{
  GstVaapiDisplayDRMPrivate *const priv =
      GST_VAAPI_DISPLAY_DRM_PRIVATE (display);
  const gchar *device_path = priv->device_path;

  if (!device_path || *device_path == '\0')
    return NULL;
  return device_path;
}

/* Mangle device path with our prefix */
static gboolean
set_device_path (GstVaapiDisplay * display, const gchar * device_path)
{
  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;
}

/* Set device path from file descriptor */
static gboolean
set_device_path_from_fd (GstVaapiDisplay * display, gint drm_device)
{
  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 &&
        strncmp (&str[busid_length], "/drm/renderD", 12) != 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;

end:
  if (e)
    udev_enumerate_unref (e);
  if (udev)
    udev_unref (udev);
  return success;
}

static gboolean
gst_vaapi_display_drm_bind_display (GstVaapiDisplay * display,
    gpointer native_display)
{
  GstVaapiDisplayDRMPrivate *const priv =
      GST_VAAPI_DISPLAY_DRM_PRIVATE (display);

  priv->drm_device = GPOINTER_TO_INT (native_display);
  priv->use_foreign_display = TRUE;

  if (!set_device_path_from_fd (display, priv->drm_device))
    return FALSE;
  return TRUE;
}

static gboolean
gst_vaapi_display_drm_open_display (GstVaapiDisplay * display,
    const gchar * name)
{
  GstVaapiDisplayDRMPrivate *const priv =
      GST_VAAPI_DISPLAY_DRM_PRIVATE (display);

  if (!set_device_path (display, name))
    return FALSE;

  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;
}

static void
gst_vaapi_display_drm_close_display (GstVaapiDisplay * display)
{
  GstVaapiDisplayDRMPrivate *const priv =
      GST_VAAPI_DISPLAY_DRM_PRIVATE (display);

  if (priv->drm_device >= 0) {
    if (!priv->use_foreign_display)
      close (priv->drm_device);
    priv->drm_device = -1;
  }

  if (priv->device_path) {
    g_free (priv->device_path);
    priv->device_path = NULL;
  }

  if (priv->device_path_default) {
    g_free (priv->device_path_default);
    priv->device_path_default = NULL;
  }
}

static gboolean
gst_vaapi_display_drm_get_display_info (GstVaapiDisplay * display,
    GstVaapiDisplayInfo * info)
{
  GstVaapiDisplayDRMPrivate *const priv =
      GST_VAAPI_DISPLAY_DRM_PRIVATE (display);

  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;
  }
  return TRUE;
}

static GstVaapiWindow *
gst_vaapi_display_drm_create_window (GstVaapiDisplay * display, GstVaapiID id,
    guint width, guint height)
{
  return id != GST_VAAPI_ID_INVALID ?
      NULL : gst_vaapi_window_drm_new (display, width, height);
}

static void
gst_vaapi_display_drm_init (GstVaapiDisplayDRM * display)
{
  GstVaapiDisplayDRMPrivate *const priv =
      gst_vaapi_display_drm_get_instance_private (display);

  display->priv = priv;
  priv->drm_device = -1;
}

static void
gst_vaapi_display_drm_class_init (GstVaapiDisplayDRMClass * klass)
{
  GstVaapiDisplayClass *const dpy_class = GST_VAAPI_DISPLAY_CLASS (klass);

  dpy_class->display_type = GST_VAAPI_DISPLAY_TYPE_DRM;
  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;
  dpy_class->create_window = gst_vaapi_display_drm_create_window;
}

/**
 * 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)
{
  GstVaapiDisplay *display;
  guint types[2], i, num_types = 0;

  g_mutex_lock (&g_drm_device_type_lock);
  if (device_path)
    types[num_types++] = 0;
  else if (g_drm_device_type)
    types[num_types++] = g_drm_device_type;
  else {
    types[num_types++] = DRM_DEVICE_RENDERNODES;
    types[num_types++] = DRM_DEVICE_LEGACY;
  }

  for (i = 0; i < num_types; i++) {
    g_drm_device_type = types[i];
    display =
        gst_vaapi_display_new (g_object_new (GST_TYPE_VAAPI_DISPLAY_DRM, NULL),
        GST_VAAPI_DISPLAY_INIT_FROM_DISPLAY_NAME, (gpointer) device_path);
    if (display || device_path)
      break;
  }
  g_mutex_unlock (&g_drm_device_type_lock);
  return display;
}

/**
 * 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)
{
  g_return_val_if_fail (device >= 0, NULL);

  return gst_vaapi_display_new (g_object_new (GST_TYPE_VAAPI_DISPLAY_DRM, NULL),
      GST_VAAPI_DISPLAY_INIT_FROM_NATIVE_DISPLAY, GINT_TO_POINTER (device));
}

/**
 * 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)
{
  g_return_val_if_fail (GST_VAAPI_IS_DISPLAY_DRM (display), -1);

  return GST_VAAPI_DISPLAY_DRM_DEVICE (display);
}

/**
 * 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)
{
  g_return_val_if_fail (GST_VAAPI_IS_DISPLAY_DRM (display), NULL);

  return get_device_path (GST_VAAPI_DISPLAY_CAST (display));
}