--- /dev/null
+/**
+ * @file xcb.c
+ * @brief X11 C Bindings screen capture demux module for VLC media player
+ */
+/*****************************************************************************
+ * Copyright © 2009 Rémi Denis-Courmont
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2.0
+ * 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <stdarg.h>
+#include <xcb/xcb.h>
+#include <vlc_common.h>
+#include <vlc_demux.h>
+#include <vlc_plugin.h>
+
+#define CACHING_TEXT N_("Caching value in ms")
+#define CACHING_LONGTEXT N_( \
+ "Caching value for screen capture. " \
+ "This value should be set in milliseconds.")
+
+#define FPS_TEXT N_("Frame rate")
+#define FPS_LONGTEXT N_( \
+ "How many times the screen content should be refreshed per second.")
+
+#define LEFT_TEXT N_("Region left column")
+#define LEFT_LONGTEXT N_( \
+ "Abscissa of the capture reion in pixels.")
+
+#define TOP_TEXT N_("Region top row")
+#define TOP_LONGTEXT N_( \
+ "Ordinate of the capture region in pixels.")
+
+#define WIDTH_TEXT N_("Capture region width")
+#define WIDTH_LONGTEXT N_( \
+ "Pixel width of the capture region, or 0 for full width")
+
+#define HEIGHT_TEXT N_("Capture region height")
+#define HEIGHT_LONGTEXT N_( \
+ "Pixel height of the capture region, or 0 for full height")
+
+static int Open (vlc_object_t *);
+static void Close (vlc_object_t *);
+
+/*
+ * Module descriptor
+ */
+vlc_module_begin ()
+ set_shortname (N_("Screen"))
+ set_description (N_("Screen capture (with X11/XCB)"))
+ set_category (CAT_INPUT)
+ set_subcategory (SUBCAT_INPUT_ACCESS)
+ set_capability ("access_demux", 0)
+ set_callbacks (Open, Close)
+
+ add_integer ("screen-caching", DEFAULT_PTS_DELAY * 1000 / CLOCK_FREQ,
+ NULL, CACHING_TEXT, CACHING_LONGTEXT, true)
+ add_float ("screen-fps", 2.0, NULL, FPS_TEXT, FPS_LONGTEXT, true)
+ add_integer ("screen-left", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true)
+ change_integer_range (-32768, 32767)
+ change_safe ()
+ add_integer ("screen-top", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true)
+ change_integer_range (-32768, 32767)
+ change_safe ()
+ add_integer ("screen-width", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true)
+ change_integer_range (0, 65535)
+ change_safe ()
+ add_integer ("screen-height", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true)
+ change_integer_range (0, 65535)
+ change_safe ()
+
+ add_shortcut ("screen")
+ add_shortcut ("window")
+vlc_module_end ()
+
+/*
+ * Local prototypes
+ */
+static int Demux (demux_t *);
+static int Control (demux_t *, int, va_list);
+
+struct demux_sys_t
+{
+ xcb_connection_t *conn;
+ es_out_id_t *es;
+ mtime_t pts, interval;
+ xcb_window_t window;
+ int16_t x, y;
+ uint16_t w, h;
+};
+
+/**
+ * Probes and initializes.
+ */
+static int Open (vlc_object_t *obj)
+{
+ demux_t *demux = (demux_t *)obj;
+ demux_sys_t *p_sys = malloc (sizeof (*p_sys));
+
+ if (p_sys == NULL)
+ return VLC_ENOMEM;
+
+ /* Connect to X server */
+ char *display = var_CreateGetNonEmptyString (obj, "x11-display");
+ int snum;
+ xcb_connection_t *conn = xcb_connect (display, &snum);
+ free (display);
+ if (xcb_connection_has_error (conn))
+ {
+ free (p_sys);
+ return VLC_EGENERIC;
+ }
+ p_sys->conn = conn;
+
+ /* Find configured screen */
+ const xcb_setup_t *setup = xcb_get_setup (conn);
+ xcb_screen_t *scr = NULL;
+ for (xcb_screen_iterator_t i = xcb_setup_roots_iterator (setup);
+ i.rem > 0; xcb_screen_next (&i))
+ {
+ if (snum == 0)
+ {
+ scr = i.data;
+ break;
+ }
+ snum--;
+ }
+ if (scr == NULL)
+ {
+ msg_Err (obj, "bad X11 screen number");
+ goto error;
+ }
+
+ /* Determine capture window */
+ if (!strcmp (demux->psz_access, "screen"))
+ p_sys->window = scr->root;
+ else
+ if (!strcmp (demux->psz_access, "window"))
+ {
+ char *end;
+ unsigned long ul = strtoul (demux->psz_path, &end, 0);
+ if (*end || ul > 0xffffffff)
+ {
+ msg_Err (obj, "bad X11 window %s", demux->psz_path);
+ goto error;
+ }
+ p_sys->window = ul;
+ }
+ else
+ goto error;
+
+ /* Window properties */
+ xcb_get_geometry_reply_t *geo;
+ geo = xcb_get_geometry_reply (conn,
+ xcb_get_geometry (conn, p_sys->window),
+ NULL);
+ if (geo == NULL)
+ {
+ msg_Err (obj, "bad X11 window 0x%08"PRIx32, p_sys->window);
+ goto error;
+ }
+
+ p_sys->x = var_CreateGetInteger (obj, "screen-left");
+ p_sys->y = var_CreateGetInteger (obj, "screen-top");
+ p_sys->w = var_CreateGetInteger (obj, "screen-width");
+ if (p_sys->w == 0)
+ p_sys->w = geo->width;
+ p_sys->h = var_CreateGetInteger (obj, "screen-height");
+ if (p_sys->h == 0)
+ p_sys->h = geo->height;
+
+ uint32_t chroma = 0;
+ uint8_t bpp = geo->depth;
+ for (const xcb_format_t *fmt = xcb_setup_pixmap_formats (setup),
+ *end = fmt + xcb_setup_pixmap_formats_length (setup);
+ fmt < end; fmt++)
+ {
+ if (fmt->depth != geo->depth)
+ continue;
+ switch (geo->depth)
+ {
+ case 32:
+ if (fmt->bits_per_pixel == 32)
+ chroma = VLC_CODEC_RGBA;
+ break;
+ case 24:
+ if (fmt->bits_per_pixel == 32)
+ {
+ chroma = VLC_CODEC_RGB32;
+ bpp = 32;
+ }
+ else if (fmt->bits_per_pixel == 24)
+ chroma = VLC_CODEC_RGB24;
+ break;
+ case 16:
+ if (fmt->bits_per_pixel == 16)
+ chroma = VLC_CODEC_RGB16;
+ break;
+ case 15:
+ if (fmt->bits_per_pixel == 16)
+ chroma = VLC_CODEC_RGB15;
+ break;
+ case 8: /* XXX: screw grey scale! */
+ if (fmt->bits_per_pixel == 8)
+ chroma = VLC_CODEC_RGB8;
+ break;
+ }
+ if (chroma != 0)
+ break;
+ }
+ free (geo);
+
+ if (!chroma)
+ {
+ msg_Err (obj, "unsupported pixmap formats");
+ goto error;
+ }
+
+ /* Initializes format */
+ float rate = var_CreateGetFloat (obj, "screen-fps");
+ if (!rate)
+ goto error;
+ p_sys->interval = (float)CLOCK_FREQ / rate;
+ if (!p_sys->interval)
+ goto error;
+ var_Create (obj, "screen-caching", VLC_VAR_INTEGER|VLC_VAR_DOINHERIT);
+
+ es_format_t fmt;
+ es_format_Init (&fmt, VIDEO_ES, chroma);
+ fmt.video.i_chroma = chroma;
+ fmt.video.i_visible_width =
+ fmt.video.i_width = p_sys->w;
+ fmt.video.i_visible_height =
+ fmt.video.i_height = p_sys->h;
+ fmt.video.i_bits_per_pixel = bpp;
+ fmt.video.i_sar_num = fmt.video.i_sar_den = 1;
+ fmt.video.i_frame_rate = 1000 * rate;
+ fmt.video.i_frame_rate_base = 1000;
+ p_sys->es = es_out_Add (demux->out, &fmt);
+ if (p_sys->es == NULL)
+ goto error;
+ p_sys->pts = VLC_TS_INVALID;
+
+ /* Initializes demux */
+ demux->pf_demux = Demux;
+ demux->pf_control = Control;
+ demux->p_sys = p_sys;
+ return VLC_SUCCESS;
+
+error:
+ Close (obj);
+ return VLC_EGENERIC;
+}
+
+
+/**
+ * Releases resources
+ */
+static void Close (vlc_object_t *obj)
+{
+ demux_t *demux = (demux_t *)obj;
+ demux_sys_t *p_sys = demux->p_sys;
+
+ xcb_disconnect (p_sys->conn);
+ free (p_sys);
+}
+
+
+/**
+ * Control callback
+ */
+static int Control (demux_t *demux, int query, va_list args)
+{
+ switch (query)
+ {
+ case DEMUX_GET_POSITION:
+ {
+ float *v = va_arg (args, float *);
+ *v = 0.;
+ return VLC_SUCCESS;
+ }
+
+ case DEMUX_GET_LENGTH:
+ case DEMUX_GET_TIME:
+ {
+ int64_t *v = va_arg (args, int64_t *);
+ *v = 0;
+ return VLC_SUCCESS;
+ }
+
+ /* TODO: get title info -> crawl visible windows */
+
+ case DEMUX_GET_PTS_DELAY:
+ {
+ int64_t *v = va_arg (args, int64_t *);
+ *v = var_GetInteger (demux, "screen-caching") * UINT64_C(1000);
+ return VLC_SUCCESS;
+ }
+
+ case DEMUX_CAN_PAUSE:
+ case DEMUX_CAN_CONTROL_PACE:
+ {
+ bool *v = (bool*)va_arg( args, bool * );
+ *v = true;
+ return VLC_SUCCESS;
+ }
+
+ case DEMUX_SET_PAUSE_STATE:
+ es_out_Control (demux->out, ES_OUT_RESET_PCR);
+ return VLC_SUCCESS;
+
+ case DEMUX_CAN_CONTROL_RATE:
+ case DEMUX_CAN_SEEK:
+ {
+ bool *v = (bool*)va_arg( args, bool * );
+ *v = false;
+ return VLC_SUCCESS;
+ }
+ }
+
+ return VLC_EGENERIC;
+}
+
+
+/**
+ * Processing callback
+ */
+static int Demux (demux_t *demux)
+{
+ demux_sys_t *p_sys = demux->p_sys;
+ xcb_get_image_reply_t *img;
+
+ /* Capture screen */
+ img = xcb_get_image_reply (p_sys->conn,
+ xcb_get_image (p_sys->conn, XCB_IMAGE_FORMAT_Z_PIXMAP, p_sys->window,
+ p_sys->x, p_sys->y, p_sys->w, p_sys->h, ~0), NULL);
+ if (img == NULL)
+ {
+ msg_Warn (demux, "no image - halting capture");
+ return 0;
+ }
+
+ /* Send block - zero copy */
+ mtime_t now = mdate ();
+ block_t *block = block_heap_Alloc (img, xcb_get_image_data (img),
+ xcb_get_image_data_length (img));
+ if (block == NULL)
+ return 0;
+ block->i_pts = block->i_dts = now;
+
+ es_out_Control (demux->out, ES_OUT_SET_PCR, now);
+ es_out_Send (demux->out, p_sys->es, block);
+ return 1;
+}
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