3 * @brief X C Bindings video output module for VLC media player
5 /*****************************************************************************
6 * Copyright © 2009 Rémi Denis-Courmont
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 ****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_vout_display.h>
36 #include <vlc_picture_pool.h>
40 #define DISPLAY_TEXT N_("X11 display")
41 #define DISPLAY_LONGTEXT N_( \
42 "X11 hardware display to use. By default VLC will " \
43 "use the value of the DISPLAY environment variable.")
45 #define SHM_TEXT N_("Use shared memory")
46 #define SHM_LONGTEXT N_( \
47 "Use shared memory to communicate between VLC and the X server.")
49 static int Open (vlc_object_t *);
50 static void Close (vlc_object_t *);
56 set_shortname (N_("X11"))
57 set_description (N_("X11 video output (XCB)"))
58 set_category (CAT_VIDEO)
59 set_subcategory (SUBCAT_VIDEO_VOUT)
60 set_capability ("vout display", 75)
61 set_callbacks (Open, Close)
63 add_string ("x11-display", NULL, NULL,
64 DISPLAY_TEXT, DISPLAY_LONGTEXT, true)
65 add_bool ("x11-shm", true, NULL, SHM_TEXT, SHM_LONGTEXT, true)
68 /* It must be large enough to absorb the server display jitter but it is
69 * useless to used a too large value, direct rendering cannot be used with
72 #define MAX_PICTURES (3)
74 struct vout_display_sys_t
76 xcb_connection_t *conn;
77 vout_window_t *embed; /* VLC window (when windowed) */
79 xcb_cursor_t cursor; /* blank cursor */
80 xcb_window_t window; /* drawable X window */
81 xcb_gcontext_t gc; /* context to put images */
82 bool shm; /* whether to use MIT-SHM */
83 bool visible; /* whether to draw */
84 uint8_t bpp; /* bits per pixel */
85 uint8_t pad; /* scanline pad */
86 uint8_t depth; /* useful bits per pixel */
87 uint8_t byte_order; /* server byte order */
89 picture_pool_t *pool; /* picture pool */
90 picture_resource_t resource[MAX_PICTURES];
93 static picture_t *Get (vout_display_t *);
94 static void Display (vout_display_t *, picture_t *);
95 static int Control (vout_display_t *, int, va_list);
96 static void Manage (vout_display_t *);
98 static void ResetPictures (vout_display_t *);
101 * Probe the X server.
103 static int Open (vlc_object_t *obj)
105 vout_display_t *vd = (vout_display_t *)obj;
106 vout_display_sys_t *p_sys = malloc (sizeof (*p_sys));
114 p_sys->conn = Connect (obj);
115 if (p_sys->conn == NULL)
122 const xcb_screen_t *scr;
123 p_sys->embed = GetWindow (vd, p_sys->conn, &scr, &p_sys->shm);
124 if (p_sys->embed == NULL)
126 xcb_disconnect (p_sys->conn);
131 const xcb_setup_t *setup = xcb_get_setup (p_sys->conn);
132 p_sys->byte_order = setup->image_byte_order;
135 video_format_t fmt_pic = vd->fmt;
137 /* Determine our video format. */
138 xcb_visualid_t vid = 0;
141 for (const xcb_format_t *fmt = xcb_setup_pixmap_formats (setup),
142 *end = fmt + xcb_setup_pixmap_formats_length (setup);
145 vlc_fourcc_t chroma = 0;
147 if (fmt->depth < depth)
148 continue; /* We already found a better format! */
150 /* Check that the pixmap format is supported by VLC. */
154 if (fmt->bits_per_pixel == 32)
155 chroma = VLC_CODEC_RGB32;
156 else if (fmt->bits_per_pixel == 24)
157 chroma = VLC_CODEC_RGB24;
162 if (fmt->bits_per_pixel != 16)
164 chroma = VLC_CODEC_RGB16;
167 if (fmt->bits_per_pixel != 16)
169 chroma = VLC_CODEC_RGB15;
172 if (fmt->bits_per_pixel != 8)
174 chroma = VLC_CODEC_RGB8;
179 if ((fmt->bits_per_pixel << 4) % fmt->scanline_pad)
180 continue; /* VLC pads lines to 16 pixels internally */
182 /* Byte sex is a non-issue for 8-bits. It can be worked around with
183 * RGB masks for 24-bits. Too bad for 15-bits and 16-bits. */
184 if (fmt->bits_per_pixel == 16 && setup->image_byte_order != ORDER)
187 /* Check that the selected screen supports this depth */
188 xcb_depth_iterator_t it = xcb_screen_allowed_depths_iterator (scr);
189 while (it.rem > 0 && it.data->depth != fmt->depth)
190 xcb_depth_next (&it);
192 continue; /* Depth not supported on this screen */
194 /* Find a visual type for the selected depth */
195 const xcb_visualtype_t *vt = xcb_depth_visuals (it.data);
196 for (int i = xcb_depth_visuals_length (it.data); i > 0; i--)
198 if (vt->_class == XCB_VISUAL_CLASS_TRUE_COLOR)
203 if (fmt->depth == 8 && vt->_class == XCB_VISUAL_CLASS_STATIC_GRAY)
206 continue; /* Prefer color over gray scale */
207 chroma = VLC_CODEC_GREY;
211 continue; /* The screen does not *really* support this depth */
214 fmt_pic.i_chroma = chroma;
218 fmt_pic.i_rmask = vt->red_mask;
219 fmt_pic.i_gmask = vt->green_mask;
220 fmt_pic.i_bmask = vt->blue_mask;
222 p_sys->bpp = fmt->bits_per_pixel;
223 p_sys->pad = fmt->scanline_pad;
224 p_sys->depth = depth = fmt->depth;
229 msg_Err (vd, "no supported pixmap formats or visual types");
233 msg_Dbg (vd, "using X11 visual ID 0x%"PRIx32" (depth: %"PRIu8")", vid,
235 msg_Dbg (vd, " %"PRIu8" bits per pixels, %"PRIu8" bits line pad",
236 p_sys->bpp, p_sys->pad);
238 /* Create colormap (needed to select non-default visual) */
240 if (vid != scr->root_visual)
242 cmap = xcb_generate_id (p_sys->conn);
243 xcb_create_colormap (p_sys->conn, XCB_COLORMAP_ALLOC_NONE,
244 cmap, scr->root, vid);
247 cmap = scr->default_colormap;
250 unsigned width, height;
251 if (GetWindowSize (p_sys->embed, p_sys->conn, &width, &height))
254 p_sys->window = xcb_generate_id (p_sys->conn);
255 p_sys->gc = xcb_generate_id (p_sys->conn);
257 const uint32_t mask = XCB_CW_EVENT_MASK | XCB_CW_COLORMAP;
258 const uint32_t values[] = {
259 /* XCB_CW_EVENT_MASK */
260 XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE |
261 XCB_EVENT_MASK_VISIBILITY_CHANGE,
262 /* XCB_CW_COLORMAP */
267 c = xcb_create_window_checked (p_sys->conn, depth, p_sys->window,
268 p_sys->embed->handle.xid, 0, 0,
270 XCB_WINDOW_CLASS_INPUT_OUTPUT,
272 xcb_map_window (p_sys->conn, p_sys->window);
273 /* Create graphic context (I wonder why the heck do we need this) */
274 xcb_create_gc (p_sys->conn, p_sys->gc, p_sys->window, 0, NULL);
276 if (CheckError (vd, p_sys->conn, "cannot create X11 window", c))
279 msg_Dbg (vd, "using X11 window %08"PRIx32, p_sys->window);
280 msg_Dbg (vd, "using X11 graphic context %08"PRIx32, p_sys->gc);
281 p_sys->cursor = CreateBlankCursor (p_sys->conn, scr);
283 p_sys->visible = false;
286 vout_display_info_t info = vd->info;
287 info.has_pictures_invalid = true;
289 /* Setup vout_display_t once everything is fine */
295 vd->display = Display;
296 vd->control = Control;
300 vout_display_SendEventFullscreen (vd, false);
301 vout_display_SendEventDisplaySize (vd, width, height, false);
312 * Disconnect from the X server.
314 static void Close (vlc_object_t *obj)
316 vout_display_t *vd = (vout_display_t *)obj;
317 vout_display_sys_t *p_sys = vd->sys;
320 vout_display_DeleteWindow (vd, p_sys->embed);
321 /* colormap, window and context are garbage-collected by X */
322 xcb_disconnect (p_sys->conn);
327 * Return a direct buffer
329 static picture_t *Get (vout_display_t *vd)
331 vout_display_sys_t *p_sys = vd->sys;
335 vout_display_place_t place;
337 vout_display_PlacePicture (&place, &vd->source, vd->cfg, false);
340 const uint32_t values[] = { place.x, place.y, place.width, place.height };
341 xcb_configure_window (p_sys->conn, p_sys->window,
342 XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y |
343 XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT,
346 picture_t *pic = picture_NewFromFormat (&vd->fmt);
350 assert (pic->i_planes == 1);
351 memset (p_sys->resource, 0, sizeof(p_sys->resource));
354 picture_t *pic_array[MAX_PICTURES];
355 for (count = 0; count < MAX_PICTURES; count++)
357 picture_resource_t *res = &p_sys->resource[count];
359 res->p->i_lines = pic->p->i_lines;
360 res->p->i_pitch = pic->p->i_pitch;
361 if (PictureResourceAlloc (vd, res, res->p->i_pitch * res->p->i_lines,
362 p_sys->conn, p_sys->shm))
364 pic_array[count] = picture_NewFromResource (&vd->fmt, res);
365 if (!pic_array[count])
367 PictureResourceFree (res, p_sys->conn);
368 memset (res, 0, sizeof(*res));
372 picture_Release (pic);
377 p_sys->pool = picture_pool_New (count, pic_array);
380 /* TODO release picture resources */
383 /* FIXME should also do it in case of error ? */
384 xcb_flush (p_sys->conn);
387 return picture_pool_Get (p_sys->pool);
391 * Sends an image to the X server.
393 static void Display (vout_display_t *vd, picture_t *pic)
395 vout_display_sys_t *p_sys = vd->sys;
396 xcb_shm_seg_t segment = pic->p_sys->segment;
397 xcb_void_cookie_t ck;
402 ck = xcb_shm_put_image_checked (p_sys->conn, p_sys->window, p_sys->gc,
403 /* real width */ pic->p->i_pitch / pic->p->i_pixel_pitch,
404 /* real height */ pic->p->i_lines,
405 /* x */ vd->fmt.i_x_offset,
406 /* y */ vd->fmt.i_y_offset,
407 /* width */ vd->fmt.i_visible_width,
408 /* height */ vd->fmt.i_visible_height,
409 0, 0, p_sys->depth, XCB_IMAGE_FORMAT_Z_PIXMAP,
413 const size_t offset = vd->fmt.i_y_offset * pic->p->i_pitch;
414 const unsigned lines = pic->p->i_lines - vd->fmt.i_y_offset;
416 ck = xcb_put_image_checked (p_sys->conn, XCB_IMAGE_FORMAT_Z_PIXMAP,
417 p_sys->window, p_sys->gc,
418 pic->p->i_pitch / pic->p->i_pixel_pitch,
419 lines, -vd->fmt.i_x_offset, 0, 0, p_sys->depth,
420 pic->p->i_pitch * lines, pic->p->p_pixels + offset);
423 /* Wait for reply. This makes sure that the X server gets CPU time to
424 * display the picture. xcb_flush() is *not* sufficient: especially with
425 * shared memory the PUT requests are so short that many of them can fit in
426 * X11 socket output buffer before the kernel preempts VLC. */
427 xcb_generic_error_t *e = xcb_request_check (p_sys->conn, ck);
430 msg_Dbg (vd, "%s: X11 error %d", "cannot put image", e->error_code);
434 /* FIXME might be WAY better to wait in some case (be carefull with
435 * VOUT_DISPLAY_RESET_PICTURES if done) + does not work with
436 * vout_display wrapper. */
438 picture_Release (pic);
441 static int Control (vout_display_t *vd, int query, va_list ap)
443 vout_display_sys_t *p_sys = vd->sys;
447 case VOUT_DISPLAY_CHANGE_FULLSCREEN:
449 const vout_display_cfg_t *c = va_arg (ap, const vout_display_cfg_t *);
450 return vout_window_SetFullScreen (p_sys->embed, c->is_fullscreen);
453 case VOUT_DISPLAY_CHANGE_DISPLAY_SIZE:
455 const vout_display_cfg_t *p_cfg =
456 (const vout_display_cfg_t*)va_arg (ap, const vout_display_cfg_t *);
457 const bool is_forced = (bool)va_arg (ap, int);
460 && vout_window_SetSize (p_sys->embed,
461 p_cfg->display.width,
462 p_cfg->display.height))
465 vout_display_place_t place;
466 vout_display_PlacePicture (&place, &vd->source, p_cfg, false);
468 if (place.width != vd->fmt.i_visible_width ||
469 place.height != vd->fmt.i_visible_height)
471 vout_display_SendEventPicturesInvalid (vd);
475 /* Move the picture within the window */
476 const uint32_t values[] = { place.x, place.y };
477 xcb_configure_window (p_sys->conn, p_sys->window,
478 XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y,
482 case VOUT_DISPLAY_CHANGE_ON_TOP:
484 int b_on_top = (int)va_arg (ap, int);
485 return vout_window_SetOnTop (p_sys->embed, b_on_top);
488 case VOUT_DISPLAY_CHANGE_ZOOM:
489 case VOUT_DISPLAY_CHANGE_DISPLAY_FILLED:
490 case VOUT_DISPLAY_CHANGE_SOURCE_ASPECT:
491 case VOUT_DISPLAY_CHANGE_SOURCE_CROP:
492 /* I am not sure it is always necessary, but it is way simpler ... */
493 vout_display_SendEventPicturesInvalid (vd);
496 case VOUT_DISPLAY_RESET_PICTURES:
500 vout_display_place_t place;
501 vout_display_PlacePicture (&place, &vd->source, vd->cfg, false);
503 vd->fmt.i_width = vd->source.i_width * place.width / vd->source.i_visible_width;
504 vd->fmt.i_height = vd->source.i_height * place.height / vd->source.i_visible_height;
506 vd->fmt.i_visible_width = place.width;
507 vd->fmt.i_visible_height = place.height;
508 vd->fmt.i_x_offset = vd->source.i_x_offset * place.width / vd->source.i_visible_width;
509 vd->fmt.i_y_offset = vd->source.i_y_offset * place.height / vd->source.i_visible_height;
513 /* Hide the mouse. It will be send when
514 * vout_display_t::info.b_hide_mouse is false */
515 case VOUT_DISPLAY_HIDE_MOUSE:
516 xcb_change_window_attributes (p_sys->conn, p_sys->embed->handle.xid,
517 XCB_CW_CURSOR, &(uint32_t){ p_sys->cursor });
521 msg_Err (vd, "Unknown request in XCB vout display");
526 static void Manage (vout_display_t *vd)
528 vout_display_sys_t *p_sys = vd->sys;
530 ManageEvent (vd, p_sys->conn, &p_sys->visible);
533 static void ResetPictures (vout_display_t *vd)
535 vout_display_sys_t *p_sys = vd->sys;
540 for (unsigned i = 0; i < MAX_PICTURES; i++)
542 picture_resource_t *res = &p_sys->resource[i];
544 if (!res->p->p_pixels)
546 PictureResourceFree (res, p_sys->conn);
548 picture_pool_Delete (p_sys->pool);