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 static int Open (vlc_object_t *);
41 static void Close (vlc_object_t *);
47 set_shortname (N_("X11"))
48 set_description (N_("X11 video output (XCB)"))
49 set_category (CAT_VIDEO)
50 set_subcategory (SUBCAT_VIDEO_VOUT)
51 set_capability ("vout display", 75)
52 set_callbacks (Open, Close)
53 add_shortcut ("xcb-x11", "x11", "xid")
55 add_obsolete_bool ("x11-shm") /* obsoleted since 1.2.0 */
58 /* It must be large enough to absorb the server display jitter but it is
59 * useless to used a too large value, direct rendering cannot be used with
62 #define MAX_PICTURES (3)
64 struct vout_display_sys_t
66 xcb_connection_t *conn;
67 vout_window_t *embed; /* VLC window (when windowed) */
69 xcb_cursor_t cursor; /* blank cursor */
70 xcb_window_t window; /* drawable X window */
71 xcb_gcontext_t gc; /* context to put images */
72 bool shm; /* whether to use MIT-SHM */
73 bool visible; /* whether to draw */
74 uint8_t bpp; /* bits per pixel */
75 uint8_t pad; /* scanline pad */
76 uint8_t depth; /* useful bits per pixel */
77 uint8_t byte_order; /* server byte order */
79 picture_pool_t *pool; /* picture pool */
80 picture_resource_t resource[MAX_PICTURES];
83 static picture_pool_t *Pool (vout_display_t *, unsigned);
84 static void Display (vout_display_t *, picture_t *, subpicture_t *subpicture);
85 static int Control (vout_display_t *, int, va_list);
86 static void Manage (vout_display_t *);
88 static void ResetPictures (vout_display_t *);
90 static const xcb_depth_t *FindDepth (const xcb_screen_t *scr,
93 xcb_depth_t *d = NULL;
94 for (xcb_depth_iterator_t it = xcb_screen_allowed_depths_iterator (scr);
95 it.rem > 0 && d == NULL;
98 if (it.data->depth == depth)
107 * Probe the X server.
109 static int Open (vlc_object_t *obj)
111 vout_display_t *vd = (vout_display_t *)obj;
112 vout_display_sys_t *p_sys = malloc (sizeof (*p_sys));
119 /* Get window, connect to X server */
120 const xcb_screen_t *scr;
121 p_sys->embed = GetWindow (vd, &p_sys->conn, &scr, &(uint8_t){ 0 });
122 if (p_sys->embed == NULL)
128 const xcb_setup_t *setup = xcb_get_setup (p_sys->conn);
129 p_sys->byte_order = setup->image_byte_order;
131 /* Determine our pixel format */
132 xcb_visualid_t vid = 0;
135 for (const xcb_format_t *fmt = xcb_setup_pixmap_formats (setup),
136 *end = fmt + xcb_setup_pixmap_formats_length (setup);
140 if (fmt->depth <= p_sys->depth)
141 continue; /* no better than earlier format */
143 video_format_t fmt_pic = vd->fmt;
145 /* Check that the pixmap format is supported by VLC. */
149 if (fmt->bits_per_pixel != 32)
151 #ifdef FIXED_VLC_RGBA_MASK
152 fmt_pic.i_chroma = VLC_CODEC_RGBA;
155 msg_Dbg (vd, "X11 visual with alpha-channel not supported");
159 if (fmt->bits_per_pixel == 32)
160 fmt_pic.i_chroma = VLC_CODEC_RGB32;
161 else if (fmt->bits_per_pixel == 24)
162 fmt_pic.i_chroma = VLC_CODEC_RGB24;
167 if (fmt->bits_per_pixel != 16)
169 fmt_pic.i_chroma = VLC_CODEC_RGB16;
172 if (fmt->bits_per_pixel != 16)
174 fmt_pic.i_chroma = VLC_CODEC_RGB15;
177 if (fmt->bits_per_pixel != 8)
179 fmt_pic.i_chroma = VLC_CODEC_RGB8;
185 /* VLC pads lines to 16 pixels internally */
186 if ((fmt->bits_per_pixel << 4) % fmt->scanline_pad)
189 /* Byte sex is a non-issue for 8-bits. It can be worked around with
190 * RGB masks for 24-bits. Too bad for 15-bits and 16-bits. */
191 if (fmt->bits_per_pixel == 16 && setup->image_byte_order != ORDER)
194 /* Check that the selected screen supports this depth */
195 const xcb_depth_t *d = FindDepth (scr, fmt->depth);
199 /* Find a visual type for the selected depth */
200 const xcb_visualtype_t *vt = xcb_depth_visuals (d);
202 /* First try True Color class */
203 for (int i = xcb_depth_visuals_length (d); i > 0; i--)
205 if (vt->_class == XCB_VISUAL_CLASS_TRUE_COLOR)
207 fmt_pic.i_rmask = vt->red_mask;
208 fmt_pic.i_gmask = vt->green_mask;
209 fmt_pic.i_bmask = vt->blue_mask;
214 /* Then try Static Gray class */
216 for (int i = xcb_depth_visuals_length (d); i > 0 && !vid; i--)
218 if (vt->_class == XCB_VISUAL_CLASS_STATIC_GRAY)
223 continue; /* Fail: unusable pixel format */
226 fmt_pic.i_chroma = VLC_CODEC_GREY;
228 p_sys->bpp = fmt->bits_per_pixel;
229 p_sys->pad = fmt->scanline_pad;
230 p_sys->depth = fmt->depth;
237 msg_Err (obj, "no supported pixel format & visual");
241 msg_Dbg (vd, "using X11 visual ID 0x%"PRIx32, vid);
242 msg_Dbg (vd, " %"PRIu8" bits depth", p_sys->depth);
243 msg_Dbg (vd, " %"PRIu8" bits per pixel", p_sys->bpp);
244 msg_Dbg (vd, " %"PRIu8" bits line pad", p_sys->pad);
246 /* Create colormap (needed to select non-default visual) */
248 if (vid != scr->root_visual)
250 cmap = xcb_generate_id (p_sys->conn);
251 xcb_create_colormap (p_sys->conn, XCB_COLORMAP_ALLOC_NONE,
252 cmap, scr->root, vid);
255 cmap = scr->default_colormap;
258 unsigned width, height;
259 if (GetWindowSize (p_sys->embed, p_sys->conn, &width, &height))
262 p_sys->window = xcb_generate_id (p_sys->conn);
263 p_sys->gc = xcb_generate_id (p_sys->conn);
264 xcb_pixmap_t pixmap = xcb_generate_id (p_sys->conn);
266 const uint32_t mask =
269 XCB_CW_BORDER_PIXMAP |
270 XCB_CW_BORDER_PIXEL |
273 const uint32_t values[] = {
274 /* XCB_CW_BACK_PIXMAP */
276 /* XCB_CW_BACK_PIXEL */
278 /* XCB_CW_BORDER_PIXMAP */
280 /* XCB_CW_BORDER_PIXEL */
282 /* XCB_CW_EVENT_MASK */
283 XCB_EVENT_MASK_VISIBILITY_CHANGE,
284 /* XCB_CW_COLORMAP */
289 xcb_create_pixmap (p_sys->conn, p_sys->depth, pixmap, scr->root, 1, 1);
290 c = xcb_create_window_checked (p_sys->conn, p_sys->depth,
292 p_sys->embed->handle.xid, 0, 0,
294 XCB_WINDOW_CLASS_INPUT_OUTPUT,
296 xcb_map_window (p_sys->conn, p_sys->window);
297 /* Create graphic context (I wonder why the heck do we need this) */
298 xcb_create_gc (p_sys->conn, p_sys->gc, p_sys->window, 0, NULL);
300 if (CheckError (vd, p_sys->conn, "cannot create X11 window", c))
303 msg_Dbg (vd, "using X11 window %08"PRIx32, p_sys->window);
304 msg_Dbg (vd, "using X11 graphic context %08"PRIx32, p_sys->gc);
305 p_sys->cursor = CreateBlankCursor (p_sys->conn, scr);
307 p_sys->visible = false;
309 p_sys->shm = CheckSHM (obj, p_sys->conn);
312 vout_display_info_t info = vd->info;
313 info.has_pictures_invalid = true;
314 info.has_event_thread = true;
316 /* Setup vout_display_t once everything is fine */
321 vd->display = Display;
322 vd->control = Control;
326 bool is_fullscreen = vd->cfg->is_fullscreen;
327 if (is_fullscreen && vout_window_SetFullScreen (p_sys->embed, true))
328 is_fullscreen = false;
329 vout_display_SendEventFullscreen (vd, is_fullscreen);
330 vout_display_SendEventDisplaySize (vd, width, height, is_fullscreen);
341 * Disconnect from the X server.
343 static void Close (vlc_object_t *obj)
345 vout_display_t *vd = (vout_display_t *)obj;
346 vout_display_sys_t *p_sys = vd->sys;
350 /* show the default cursor */
351 xcb_change_window_attributes (p_sys->conn, p_sys->embed->handle.xid, XCB_CW_CURSOR,
352 &(uint32_t) { XCB_CURSOR_NONE });
353 xcb_flush (p_sys->conn);
355 /* colormap, window and context are garbage-collected by X */
356 xcb_disconnect (p_sys->conn);
357 vout_display_DeleteWindow (vd, p_sys->embed);
362 * Return a direct buffer
364 static picture_pool_t *Pool (vout_display_t *vd, unsigned requested_count)
366 vout_display_sys_t *p_sys = vd->sys;
367 (void)requested_count;
371 vout_display_place_t place;
373 vout_display_PlacePicture (&place, &vd->source, vd->cfg, false);
376 const uint32_t values[] = { place.x, place.y, place.width, place.height };
377 xcb_configure_window (p_sys->conn, p_sys->window,
378 XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y |
379 XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT,
382 picture_t *pic = picture_NewFromFormat (&vd->fmt);
386 assert (pic->i_planes == 1);
387 memset (p_sys->resource, 0, sizeof(p_sys->resource));
390 picture_t *pic_array[MAX_PICTURES];
391 for (count = 0; count < MAX_PICTURES; count++)
393 picture_resource_t *res = &p_sys->resource[count];
395 res->p->i_lines = pic->p->i_lines;
396 res->p->i_pitch = pic->p->i_pitch;
397 if (PictureResourceAlloc (vd, res, res->p->i_pitch * res->p->i_lines,
398 p_sys->conn, p_sys->shm))
400 pic_array[count] = picture_NewFromResource (&vd->fmt, res);
401 if (!pic_array[count])
403 PictureResourceFree (res, p_sys->conn);
404 memset (res, 0, sizeof(*res));
408 picture_Release (pic);
413 p_sys->pool = picture_pool_New (count, pic_array);
414 /* TODO release picture resources if NULL */
415 xcb_flush (p_sys->conn);
422 * Sends an image to the X server.
424 static void Display (vout_display_t *vd, picture_t *pic, subpicture_t *subpicture)
426 vout_display_sys_t *p_sys = vd->sys;
427 xcb_shm_seg_t segment = pic->p_sys->segment;
428 xcb_void_cookie_t ck;
433 ck = xcb_shm_put_image_checked (p_sys->conn, p_sys->window, p_sys->gc,
434 /* real width */ pic->p->i_pitch / pic->p->i_pixel_pitch,
435 /* real height */ pic->p->i_lines,
436 /* x */ vd->fmt.i_x_offset,
437 /* y */ vd->fmt.i_y_offset,
438 /* width */ vd->fmt.i_visible_width,
439 /* height */ vd->fmt.i_visible_height,
440 0, 0, p_sys->depth, XCB_IMAGE_FORMAT_Z_PIXMAP,
444 const size_t offset = vd->fmt.i_y_offset * pic->p->i_pitch;
445 const unsigned lines = pic->p->i_lines - vd->fmt.i_y_offset;
447 ck = xcb_put_image_checked (p_sys->conn, XCB_IMAGE_FORMAT_Z_PIXMAP,
448 p_sys->window, p_sys->gc,
449 pic->p->i_pitch / pic->p->i_pixel_pitch,
450 lines, -vd->fmt.i_x_offset, 0, 0, p_sys->depth,
451 pic->p->i_pitch * lines, pic->p->p_pixels + offset);
454 /* Wait for reply. This makes sure that the X server gets CPU time to
455 * display the picture. xcb_flush() is *not* sufficient: especially with
456 * shared memory the PUT requests are so short that many of them can fit in
457 * X11 socket output buffer before the kernel preempts VLC. */
458 xcb_generic_error_t *e = xcb_request_check (p_sys->conn, ck);
461 msg_Dbg (vd, "%s: X11 error %d", "cannot put image", e->error_code);
465 /* FIXME might be WAY better to wait in some case (be carefull with
466 * VOUT_DISPLAY_RESET_PICTURES if done) + does not work with
467 * vout_display wrapper. */
469 picture_Release (pic);
473 static int Control (vout_display_t *vd, int query, va_list ap)
475 vout_display_sys_t *p_sys = vd->sys;
479 case VOUT_DISPLAY_CHANGE_FULLSCREEN:
481 const vout_display_cfg_t *c = va_arg (ap, const vout_display_cfg_t *);
482 return vout_window_SetFullScreen (p_sys->embed, c->is_fullscreen);
485 case VOUT_DISPLAY_CHANGE_DISPLAY_SIZE:
487 const vout_display_cfg_t *p_cfg =
488 (const vout_display_cfg_t*)va_arg (ap, const vout_display_cfg_t *);
489 const bool is_forced = (bool)va_arg (ap, int);
492 && vout_window_SetSize (p_sys->embed,
493 p_cfg->display.width,
494 p_cfg->display.height))
497 vout_display_place_t place;
498 vout_display_PlacePicture (&place, &vd->source, p_cfg, false);
500 if (place.width != vd->fmt.i_visible_width ||
501 place.height != vd->fmt.i_visible_height)
503 vout_display_SendEventPicturesInvalid (vd);
507 /* Move the picture within the window */
508 const uint32_t values[] = { place.x, place.y };
509 xcb_configure_window (p_sys->conn, p_sys->window,
510 XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y,
514 case VOUT_DISPLAY_CHANGE_WINDOW_STATE:
516 unsigned state = va_arg (ap, unsigned);
517 return vout_window_SetState (p_sys->embed, state);
520 case VOUT_DISPLAY_CHANGE_ZOOM:
521 case VOUT_DISPLAY_CHANGE_DISPLAY_FILLED:
522 case VOUT_DISPLAY_CHANGE_SOURCE_ASPECT:
523 case VOUT_DISPLAY_CHANGE_SOURCE_CROP:
524 /* I am not sure it is always necessary, but it is way simpler ... */
525 vout_display_SendEventPicturesInvalid (vd);
528 case VOUT_DISPLAY_RESET_PICTURES:
532 vout_display_place_t place;
533 vout_display_PlacePicture (&place, &vd->source, vd->cfg, false);
535 vd->fmt.i_width = vd->source.i_width * place.width / vd->source.i_visible_width;
536 vd->fmt.i_height = vd->source.i_height * place.height / vd->source.i_visible_height;
538 vd->fmt.i_visible_width = place.width;
539 vd->fmt.i_visible_height = place.height;
540 vd->fmt.i_x_offset = vd->source.i_x_offset * place.width / vd->source.i_visible_width;
541 vd->fmt.i_y_offset = vd->source.i_y_offset * place.height / vd->source.i_visible_height;
545 /* Hide the mouse. It will be send when
546 * vout_display_t::info.b_hide_mouse is false */
547 case VOUT_DISPLAY_HIDE_MOUSE:
548 xcb_change_window_attributes (p_sys->conn, p_sys->embed->handle.xid,
549 XCB_CW_CURSOR, &(uint32_t){ p_sys->cursor });
553 msg_Err (vd, "Unknown request in XCB vout display");
558 static void Manage (vout_display_t *vd)
560 vout_display_sys_t *p_sys = vd->sys;
562 ManageEvent (vd, p_sys->conn, &p_sys->visible);
565 static void ResetPictures (vout_display_t *vd)
567 vout_display_sys_t *p_sys = vd->sys;
572 for (unsigned i = 0; i < MAX_PICTURES; i++)
574 picture_resource_t *res = &p_sys->resource[i];
576 if (!res->p->p_pixels)
578 PictureResourceFree (res, p_sys->conn);
580 picture_pool_Delete (p_sys->pool);