3 * @brief X11 C Bindings screen capture demux 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 2.0
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 Lesser 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 ****************************************************************************/
28 #include <vlc_common.h>
29 #include <vlc_demux.h>
30 #include <vlc_plugin.h>
32 #define CACHING_TEXT N_("Caching value in ms")
33 #define CACHING_LONGTEXT N_( \
34 "Caching value for screen capture. " \
35 "This value should be set in milliseconds.")
37 #define FPS_TEXT N_("Frame rate")
38 #define FPS_LONGTEXT N_( \
39 "How many times the screen content should be refreshed per second.")
41 #define LEFT_TEXT N_("Region left column")
42 #define LEFT_LONGTEXT N_( \
43 "Abscissa of the capture reion in pixels.")
45 #define TOP_TEXT N_("Region top row")
46 #define TOP_LONGTEXT N_( \
47 "Ordinate of the capture region in pixels.")
49 #define WIDTH_TEXT N_("Capture region width")
50 #define WIDTH_LONGTEXT N_( \
51 "Pixel width of the capture region, or 0 for full width")
53 #define HEIGHT_TEXT N_("Capture region height")
54 #define HEIGHT_LONGTEXT N_( \
55 "Pixel height of the capture region, or 0 for full height")
57 static int Open (vlc_object_t *);
58 static void Close (vlc_object_t *);
64 set_shortname (N_("Screen"))
65 set_description (N_("Screen capture (with X11/XCB)"))
66 set_category (CAT_INPUT)
67 set_subcategory (SUBCAT_INPUT_ACCESS)
68 set_capability ("access_demux", 0)
69 set_callbacks (Open, Close)
71 add_integer ("screen-caching", DEFAULT_PTS_DELAY * 1000 / CLOCK_FREQ,
72 NULL, CACHING_TEXT, CACHING_LONGTEXT, true)
73 add_float ("screen-fps", 2.0, NULL, FPS_TEXT, FPS_LONGTEXT, true)
74 add_integer ("screen-left", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true)
75 change_integer_range (-32768, 32767)
77 add_integer ("screen-top", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true)
78 change_integer_range (-32768, 32767)
80 add_integer ("screen-width", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true)
81 change_integer_range (0, 65535)
83 add_integer ("screen-height", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true)
84 change_integer_range (0, 65535)
87 add_shortcut ("screen")
88 add_shortcut ("window")
94 static int Demux (demux_t *);
95 static int Control (demux_t *, int, va_list);
99 xcb_connection_t *conn;
101 mtime_t pts, interval;
108 * Probes and initializes.
110 static int Open (vlc_object_t *obj)
112 demux_t *demux = (demux_t *)obj;
113 demux_sys_t *p_sys = malloc (sizeof (*p_sys));
117 demux->p_sys = p_sys;
119 /* Connect to X server */
120 char *display = var_CreateGetNonEmptyString (obj, "x11-display");
122 xcb_connection_t *conn = xcb_connect (display, &snum);
124 if (xcb_connection_has_error (conn))
131 /* Find configured screen */
132 const xcb_setup_t *setup = xcb_get_setup (conn);
133 xcb_screen_t *scr = NULL;
134 for (xcb_screen_iterator_t i = xcb_setup_roots_iterator (setup);
135 i.rem > 0; xcb_screen_next (&i))
146 msg_Err (obj, "bad X11 screen number");
150 /* Determine capture window */
151 if (!strcmp (demux->psz_access, "screen"))
152 p_sys->window = scr->root;
154 if (!strcmp (demux->psz_access, "window"))
157 unsigned long ul = strtoul (demux->psz_path, &end, 0);
158 if (*end || ul > 0xffffffff)
160 msg_Err (obj, "bad X11 drawable %s", demux->psz_path);
168 /* Window properties */
169 xcb_get_geometry_reply_t *geo;
170 geo = xcb_get_geometry_reply (conn,
171 xcb_get_geometry (conn, p_sys->window),
175 msg_Err (obj, "bad X11 window 0x%08"PRIx32, p_sys->window);
179 p_sys->x = var_CreateGetInteger (obj, "screen-left");
180 p_sys->y = var_CreateGetInteger (obj, "screen-top");
181 p_sys->w = var_CreateGetInteger (obj, "screen-width");
183 p_sys->w = geo->width - p_sys->x;
184 p_sys->h = var_CreateGetInteger (obj, "screen-height");
186 p_sys->h = geo->height - p_sys->y;
190 for (const xcb_format_t *fmt = xcb_setup_pixmap_formats (setup),
191 *end = fmt + xcb_setup_pixmap_formats_length (setup);
194 if (fmt->depth != geo->depth)
200 if (fmt->bits_per_pixel == 32)
201 chroma = VLC_CODEC_RGBA;
204 if (fmt->bits_per_pixel == 32)
206 chroma = VLC_CODEC_RGB32;
209 else if (fmt->bits_per_pixel == 24)
210 chroma = VLC_CODEC_RGB24;
213 if (fmt->bits_per_pixel == 16)
214 chroma = VLC_CODEC_RGB16;
217 if (fmt->bits_per_pixel == 16)
218 chroma = VLC_CODEC_RGB15;
220 case 8: /* XXX: screw grey scale! */
221 if (fmt->bits_per_pixel == 8)
222 chroma = VLC_CODEC_RGB8;
232 msg_Err (obj, "unsupported pixmap formats");
236 /* Initializes format */
237 float rate = var_CreateGetFloat (obj, "screen-fps");
240 p_sys->interval = (float)CLOCK_FREQ / rate;
241 if (!p_sys->interval)
243 var_Create (obj, "screen-caching", VLC_VAR_INTEGER|VLC_VAR_DOINHERIT);
246 es_format_Init (&fmt, VIDEO_ES, chroma);
247 fmt.video.i_chroma = chroma;
248 fmt.video.i_visible_width =
249 fmt.video.i_width = p_sys->w;
250 fmt.video.i_visible_height =
251 fmt.video.i_height = p_sys->h;
252 fmt.video.i_bits_per_pixel = bpp;
253 fmt.video.i_sar_num = fmt.video.i_sar_den = 1;
254 fmt.video.i_frame_rate = 1000 * rate;
255 fmt.video.i_frame_rate_base = 1000;
256 p_sys->es = es_out_Add (demux->out, &fmt);
257 if (p_sys->es == NULL)
259 p_sys->pts = VLC_TS_INVALID;
261 /* Initializes demux */
262 demux->pf_demux = Demux;
263 demux->pf_control = Control;
275 static void Close (vlc_object_t *obj)
277 demux_t *demux = (demux_t *)obj;
278 demux_sys_t *p_sys = demux->p_sys;
280 xcb_disconnect (p_sys->conn);
288 static int Control (demux_t *demux, int query, va_list args)
290 demux_sys_t *p_sys = demux->p_sys;
294 case DEMUX_GET_POSITION:
296 float *v = va_arg (args, float *);
301 case DEMUX_GET_LENGTH:
304 int64_t *v = va_arg (args, int64_t *);
309 /* TODO: get title info -> crawl visible windows */
311 case DEMUX_GET_PTS_DELAY:
313 int64_t *v = va_arg (args, int64_t *);
314 *v = var_GetInteger (demux, "screen-caching") * UINT64_C(1000);
318 case DEMUX_CAN_PAUSE:
320 bool *v = (bool*)va_arg( args, bool * );
325 case DEMUX_SET_PAUSE_STATE:
327 bool pausing = va_arg (args, int);
330 p_sys->pts = VLC_TS_INVALID;
331 es_out_Control (demux->out, ES_OUT_RESET_PCR);
336 case DEMUX_CAN_CONTROL_PACE:
337 case DEMUX_CAN_CONTROL_RATE:
340 bool *v = (bool*)va_arg( args, bool * );
351 * Processing callback
353 static int Demux (demux_t *demux)
355 demux_sys_t *p_sys = demux->p_sys;
356 xcb_get_image_reply_t *img;
357 mtime_t now = mdate ();
359 if (p_sys->pts != VLC_TS_INVALID)
365 img = xcb_get_image_reply (p_sys->conn,
366 xcb_get_image (p_sys->conn, XCB_IMAGE_FORMAT_Z_PIXMAP, p_sys->window,
367 p_sys->x, p_sys->y, p_sys->w, p_sys->h, ~0), NULL);
370 msg_Warn (demux, "no image - halting capture");
374 /* Send block - zero copy */
375 block_t *block = block_heap_Alloc (img, xcb_get_image_data (img),
376 xcb_get_image_data_length (img));
379 block->i_pts = block->i_dts = now;
381 es_out_Control (demux->out, ES_OUT_SET_PCR, now);
382 es_out_Send (demux->out, p_sys->es, block);
383 p_sys->pts += p_sys->interval;