x11.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:14k
源码类别:
midi
开发平台:
Unix_Linux
- /**
- * @file x11.c
- * @brief X C Bindings video output 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 <stdlib.h>
- #include <assert.h>
- #include <xcb/xcb.h>
- #include <xcb/shm.h>
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_vout.h>
- #include <vlc_window.h>
- #include "xcb_vlc.h"
- #define DISPLAY_TEXT N_("X11 display")
- #define DISPLAY_LONGTEXT N_(
- "X11 hardware display to use. By default VLC will "
- "use the value of the DISPLAY environment variable.")
- #define SHM_TEXT N_("Use shared memory")
- #define SHM_LONGTEXT N_(
- "Use shared memory to communicate between VLC and the X server.")
- static int Open (vlc_object_t *);
- static void Close (vlc_object_t *);
- /*
- * Module descriptor
- */
- vlc_module_begin ()
- set_shortname (N_("XCB"))
- set_description (N_("(Experimental) XCB video output"))
- set_category (CAT_VIDEO)
- set_subcategory (SUBCAT_VIDEO_VOUT)
- set_capability ("video output", 0)
- set_callbacks (Open, Close)
- add_string ("x11-display", NULL, NULL,
- DISPLAY_TEXT, DISPLAY_LONGTEXT, true)
- add_bool ("x11-shm", true, NULL, SHM_TEXT, SHM_LONGTEXT, true)
- vlc_module_end ()
- struct vout_sys_t
- {
- xcb_connection_t *conn;
- vout_window_t *embed; /* VLC window (when windowed) */
- xcb_window_t window; /* drawable X window */
- xcb_gcontext_t gc; /* context to put images */
- bool shm; /* whether to use MIT-SHM */
- uint8_t bpp; /* bits per pixel */
- uint8_t pad; /* scanline pad */
- uint8_t depth; /* useful bits per pixel */
- uint8_t byte_order; /* server byte order */
- };
- static int Init (vout_thread_t *);
- static void Deinit (vout_thread_t *);
- static void Display (vout_thread_t *, picture_t *);
- static int Manage (vout_thread_t *);
- static int Control (vout_thread_t *, int, va_list);
- int CheckError (vout_thread_t *vout, const char *str, xcb_void_cookie_t ck)
- {
- xcb_generic_error_t *err;
- err = xcb_request_check (vout->p_sys->conn, ck);
- if (err)
- {
- msg_Err (vout, "%s: X11 error %d", str, err->error_code);
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- #define p_vout vout
- /**
- * Probe the X server.
- */
- static int Open (vlc_object_t *obj)
- {
- vout_thread_t *vout = (vout_thread_t *)obj;
- vout_sys_t *p_sys = malloc (sizeof (*p_sys));
- if (p_sys == NULL)
- return VLC_ENOMEM;
- vout->p_sys = p_sys;
- /* Connect to X */
- p_sys->conn = Connect (obj);
- if (p_sys->conn == NULL)
- {
- free (p_sys);
- return VLC_EGENERIC;
- }
- /* Get window */
- const xcb_screen_t *scr;
- p_sys->embed = GetWindow (vout, p_sys->conn, &scr, &p_sys->shm);
- if (p_sys->embed == NULL)
- {
- xcb_disconnect (p_sys->conn);
- free (p_sys);
- return VLC_EGENERIC;
- }
- const xcb_setup_t *setup = xcb_get_setup (p_sys->conn);
- p_sys->byte_order = setup->image_byte_order;
- /* Determine our video format. Normally, this is done in pf_init(), but
- * this plugin always uses the same format for a given X11 screen. */
- xcb_visualid_t vid = 0;
- uint8_t depth = 0;
- bool gray = true;
- for (const xcb_format_t *fmt = xcb_setup_pixmap_formats (setup),
- *end = fmt + xcb_setup_pixmap_formats_length (setup);
- fmt < end; fmt++)
- {
- vlc_fourcc_t chroma = 0;
- if (fmt->depth < depth)
- continue; /* We already found a better format! */
- /* Check that the pixmap format is supported by VLC. */
- switch (fmt->depth)
- {
- case 24:
- if (fmt->bits_per_pixel == 32)
- chroma = VLC_FOURCC ('R', 'V', '3', '2');
- else if (fmt->bits_per_pixel == 24)
- chroma = VLC_FOURCC ('R', 'V', '2', '4');
- else
- continue;
- break;
- case 16:
- if (fmt->bits_per_pixel != 16)
- continue;
- chroma = VLC_FOURCC ('R', 'V', '1', '6');
- break;
- case 15:
- if (fmt->bits_per_pixel != 16)
- continue;
- chroma = VLC_FOURCC ('R', 'V', '1', '5');
- break;
- case 8:
- if (fmt->bits_per_pixel != 8)
- continue;
- chroma = VLC_FOURCC ('R', 'G', 'B', '2');
- break;
- default:
- continue;
- }
- if ((fmt->bits_per_pixel << 4) % fmt->scanline_pad)
- continue; /* VLC pads lines to 16 pixels internally */
- /* Byte sex is a non-issue for 8-bits. It can be worked around with
- * RGB masks for 24-bits. Too bad for 15-bits and 16-bits. */
- if (fmt->bits_per_pixel == 16 && setup->image_byte_order != ORDER)
- continue;
- /* Check that the selected screen supports this depth */
- xcb_depth_iterator_t it = xcb_screen_allowed_depths_iterator (scr);
- while (it.rem > 0 && it.data->depth != fmt->depth)
- xcb_depth_next (&it);
- if (!it.rem)
- continue; /* Depth not supported on this screen */
- /* Find a visual type for the selected depth */
- const xcb_visualtype_t *vt = xcb_depth_visuals (it.data);
- for (int i = xcb_depth_visuals_length (it.data); i > 0; i--)
- {
- if (vt->_class == XCB_VISUAL_CLASS_TRUE_COLOR)
- {
- vid = vt->visual_id;
- gray = false;
- break;
- }
- if (fmt->depth == 8 && vt->_class == XCB_VISUAL_CLASS_STATIC_GRAY)
- {
- if (!gray)
- continue; /* Prefer color over gray scale */
- vid = vt->visual_id;
- chroma = VLC_FOURCC ('G', 'R', 'E', 'Y');
- }
- }
- if (!vid)
- continue; /* The screen does not *really* support this depth */
- vout->fmt_out.i_chroma = vout->output.i_chroma = chroma;
- if (!gray)
- {
- vout->fmt_out.i_rmask = vout->output.i_rmask = vt->red_mask;
- vout->fmt_out.i_gmask = vout->output.i_gmask = vt->green_mask;
- vout->fmt_out.i_bmask = vout->output.i_bmask = vt->blue_mask;
- }
- p_sys->bpp = fmt->bits_per_pixel;
- p_sys->pad = fmt->scanline_pad;
- p_sys->depth = depth = fmt->depth;
- }
- if (depth == 0)
- {
- msg_Err (vout, "no supported pixmap formats or visual types");
- goto error;
- }
- msg_Dbg (vout, "using X11 visual ID 0x%"PRIx32, vid);
- msg_Dbg (vout, " %"PRIu8" bits per pixels, %"PRIu8" bits line pad",
- p_sys->bpp, p_sys->pad);
- /* Create colormap (needed to select non-default visual) */
- xcb_colormap_t cmap;
- if (vid != scr->root_visual)
- {
- cmap = xcb_generate_id (p_sys->conn);
- xcb_create_colormap (p_sys->conn, XCB_COLORMAP_ALLOC_NONE,
- cmap, scr->root, vid);
- }
- else
- cmap = scr->default_colormap;
- /* Create window */
- {
- const uint32_t mask = XCB_CW_EVENT_MASK | XCB_CW_COLORMAP;
- const uint32_t values[] = {
- /* XCB_CW_EVENT_MASK */
- XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE |
- XCB_EVENT_MASK_POINTER_MOTION,
- /* XCB_CW_COLORMAP */
- cmap,
- };
- xcb_void_cookie_t c;
- xcb_window_t window = xcb_generate_id (p_sys->conn);
- c = xcb_create_window_checked (p_sys->conn, depth, window,
- p_sys->embed->handle.xid, 0, 0, 1, 1, 0,
- XCB_WINDOW_CLASS_INPUT_OUTPUT,
- vid, mask, values);
- if (CheckError (vout, "cannot create X11 window", c))
- goto error;
- p_sys->window = window;
- msg_Dbg (vout, "using X11 window %08"PRIx32, p_sys->window);
- xcb_map_window (p_sys->conn, window);
- }
- /* Create graphic context (I wonder why the heck do we need this) */
- p_sys->gc = xcb_generate_id (p_sys->conn);
- xcb_create_gc (p_sys->conn, p_sys->gc, p_sys->window, 0, NULL);
- msg_Dbg (vout, "using X11 graphic context %08"PRIx32, p_sys->gc);
- vout->pf_init = Init;
- vout->pf_end = Deinit;
- vout->pf_display = Display;
- vout->pf_manage = Manage;
- vout->pf_control = Control;
- return VLC_SUCCESS;
- error:
- Close (obj);
- return VLC_EGENERIC;
- }
- /**
- * Disconnect from the X server.
- */
- static void Close (vlc_object_t *obj)
- {
- vout_thread_t *vout = (vout_thread_t *)obj;
- vout_sys_t *p_sys = vout->p_sys;
- vout_ReleaseWindow (p_sys->embed);
- /* colormap and window are garbage-collected by X */
- xcb_disconnect (p_sys->conn);
- free (p_sys);
- }
- /**
- * Allocate drawable window and picture buffers.
- */
- static int Init (vout_thread_t *vout)
- {
- vout_sys_t *p_sys = vout->p_sys;
- unsigned x, y, width, height;
- if (GetWindowSize (p_sys->embed, p_sys->conn, &width, &height))
- return VLC_EGENERIC;
- vout_PlacePicture (vout, width, height, &x, &y, &width, &height);
- const uint32_t values[] = { x, y, width, height, };
- xcb_configure_window (p_sys->conn, p_sys->window,
- XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y |
- XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT,
- values);
- /* FIXME: I don't get the subtlety between output and fmt_out here */
- vout->fmt_out.i_visible_width = width;
- vout->fmt_out.i_visible_height = height;
- vout->fmt_out.i_sar_num = vout->fmt_out.i_sar_den = 1;
- vout->output.i_width = vout->fmt_out.i_width =
- width * vout->fmt_in.i_width / vout->fmt_in.i_visible_width;
- vout->output.i_height = vout->fmt_out.i_height =
- height * vout->fmt_in.i_height / vout->fmt_in.i_visible_height;
- vout->fmt_out.i_x_offset =
- width * vout->fmt_in.i_x_offset / vout->fmt_in.i_visible_width;
- p_vout->fmt_out.i_y_offset =
- height * vout->fmt_in.i_y_offset / vout->fmt_in.i_visible_height;
- assert (height > 0);
- vout->output.i_aspect = vout->fmt_out.i_aspect =
- width * VOUT_ASPECT_FACTOR / height;
- /* Allocate picture buffers */
- I_OUTPUTPICTURES = 0;
- for (size_t index = 0; I_OUTPUTPICTURES < 2; index++)
- {
- picture_t *pic = vout->p_picture + index;
- if (index > sizeof (vout->p_picture) / sizeof (pic))
- break;
- if (pic->i_status != FREE_PICTURE)
- continue;
- vout_InitPicture (vout, pic, vout->output.i_chroma,
- vout->output.i_width, vout->output.i_height,
- vout->output.i_aspect);
- if (PictureAlloc (vout, pic, pic->p->i_pitch * pic->p->i_lines,
- p_sys->shm ? p_sys->conn : NULL))
- break;
- PP_OUTPUTPICTURE[I_OUTPUTPICTURES++] = pic;
- }
- xcb_flush (p_sys->conn);
- return VLC_SUCCESS;
- }
- /**
- * Free picture buffers.
- */
- static void Deinit (vout_thread_t *vout)
- {
- for (int i = 0; i < I_OUTPUTPICTURES; i++)
- PictureFree (PP_OUTPUTPICTURE[i], vout->p_sys->conn);
- }
- /**
- * Sends an image to the X server.
- */
- static void Display (vout_thread_t *vout, picture_t *pic)
- {
- vout_sys_t *p_sys = vout->p_sys;
- xcb_shm_seg_t segment = (uintptr_t)pic->p_sys;
- if (segment != 0)
- xcb_shm_put_image (p_sys->conn, p_sys->window, p_sys->gc,
- /* real width */ pic->p->i_pitch / pic->p->i_pixel_pitch,
- /* real height */ pic->p->i_lines,
- /* x */ vout->fmt_out.i_x_offset,
- /* y */ vout->fmt_out.i_y_offset,
- /* width */ vout->fmt_out.i_visible_width,
- /* height */ vout->fmt_out.i_visible_height,
- 0, 0, p_sys->depth, XCB_IMAGE_FORMAT_Z_PIXMAP,
- 0, segment, 0);
- else
- {
- const size_t offset = vout->fmt_out.i_y_offset * pic->p->i_pitch;
- const unsigned lines = pic->p->i_lines - vout->fmt_out.i_y_offset;
- xcb_put_image (p_sys->conn, XCB_IMAGE_FORMAT_Z_PIXMAP,
- p_sys->window, p_sys->gc,
- pic->p->i_pitch / pic->p->i_pixel_pitch,
- lines, -vout->fmt_out.i_x_offset, 0, 0, p_sys->depth,
- pic->p->i_pitch * lines, pic->p->p_pixels + offset);
- }
- xcb_flush (p_sys->conn);
- }
- /**
- * Process incoming X events.
- */
- static int Manage (vout_thread_t *vout)
- {
- vout_sys_t *p_sys = vout->p_sys;
- xcb_generic_event_t *ev;
- while ((ev = xcb_poll_for_event (p_sys->conn)) != NULL)
- ProcessEvent (vout, p_sys->conn, p_sys->window, ev);
- if (xcb_connection_has_error (p_sys->conn))
- {
- msg_Err (vout, "X server failure");
- return VLC_EGENERIC;
- }
- CommonManage (vout); /* FIXME: <-- move that to core */
- return VLC_SUCCESS;
- }
- void
- HandleParentStructure (vout_thread_t *vout, xcb_connection_t *conn,
- xcb_window_t xid, xcb_configure_notify_event_t *ev)
- {
- unsigned width, height, x, y;
- vout_PlacePicture (vout, ev->width, ev->height, &x, &y, &width, &height);
- if (width != vout->fmt_out.i_visible_width
- || height != vout->fmt_out.i_visible_height)
- {
- vout->i_changes |= VOUT_SIZE_CHANGE;
- return; /* vout will be reinitialized */
- }
- /* Move the picture within the window */
- const uint32_t values[] = { x, y, };
- xcb_configure_window (conn, xid,
- XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y,
- values);
- }
- static int Control (vout_thread_t *vout, int query, va_list ap)
- {
- return vout_ControlWindow (vout->p_sys->embed, query, ap);
- }