xf86dga2.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/* $XFree86: xc/lib/Xxf86dga/XF86DGA2.c,v 1.18 2001/08/17 13:27:51 dawes Exp $ */
/*

Copyright (c) 1995  Jon Tombs
Copyright (c) 1995,1996  The XFree86 Project, Inc

*/

/* THIS IS NOT AN X CONSORTIUM STANDARD */

#ifdef __EMX__ /* needed here to override certain constants in X headers */
#define INCL_DOS
#define INCL_DOSIOCTL
#include <os2.h>
#endif

#define NEED_EVENTS
#define NEED_REPLIES
#include <X11/Xlibint.h>
#include "xf86dga.h"
#include "xf86dgastr.h"
#include <X11/extensions/Xext.h>
#include "extutil.h"
#include <stdio.h>

#if defined(linux)  /* Needed for framebuffer console support */
#include <sys/ioctl.h>
#include <linux/fb.h>
#endif

/* If you change this, change the Bases[] array below as well */
#define MAX_HEADS 16

char *SDL_NAME(xdga_extension_name) = XF86DGANAME;

static XExtensionInfo _xdga_info_data;
static XExtensionInfo *xdga_info = &_xdga_info_data;

 
Bool SDL_NAME(XDGAMapFramebuffer)(int, char *, unsigned char*, CARD32, CARD32, CARD32);
void SDL_NAME(XDGAUnmapFramebuffer)(int);
unsigned char* SDL_NAME(XDGAGetMappedMemory)(int);

#define XDGACheckExtension(dpy,i,val) \
  XextCheckExtension (dpy, i, SDL_NAME(xdga_extension_name), val)

/*****************************************************************************
 *                                                                           *
 *			   private utility routines                          *
 *                                                                           *
 *****************************************************************************/

static int xdga_close_display(Display *dpy, XExtCodes *codes);
static Bool xdga_wire_to_event(Display *dpy, XEvent *event, xEvent *wire_ev);
static Status xdga_event_to_wire(Display *dpy, XEvent *event, xEvent *wire_ev);

static XExtensionHooks xdga_extension_hooks = {
    NULL,				/* create_gc */
    NULL,				/* copy_gc */
    NULL,				/* flush_gc */
    NULL,				/* free_gc */
    NULL,				/* create_font */
    NULL,				/* free_font */
    xdga_close_display,			/* close_display */
    xdga_wire_to_event,			/* wire_to_event */
    xdga_event_to_wire,			/* event_to_wire */
    NULL,				/* error */
    NULL,				/* error_string */
};

static XEXT_GENERATE_CLOSE_DISPLAY (xdga_close_display, xdga_info)


XEXT_GENERATE_FIND_DISPLAY (SDL_NAME(xdga_find_display), xdga_info, 
				   "XFree86-DGA", 
				   &xdga_extension_hooks, 
				   0, NULL)


static Status
xdga_event_to_wire(
  Display *dpy,
  XEvent *event,
  xEvent *wire_ev
){
    return True;
}

static Bool
xdga_wire_to_event(
  Display *dpy,
  XEvent *event,
  xEvent *wire_ev
){
  dgaEvent *wire = (dgaEvent *) wire_ev;
  SDL_NAME(XDGAButtonEvent) *bevent;
  SDL_NAME(XDGAKeyEvent) *kevent;
  SDL_NAME(XDGAMotionEvent) *mevent;
  XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);

  XDGACheckExtension (dpy, info, False);

  switch((wire->u.u.type & 0x7f) - info->codes->first_event) {
  case MotionNotify:
	mevent = (SDL_NAME(XDGAMotionEvent)*)event;
	mevent->type = wire->u.u.type & 0x7F;
	mevent->serial = _XSetLastRequestRead(dpy, (xGenericReply *)wire);
	mevent->display = dpy;
	mevent->screen = wire->u.event.screen;
	mevent->time = wire->u.event.time;
	mevent->state = wire->u.event.state;
	mevent->dx = wire->u.event.dx;
	mevent->dy = wire->u.event.dy;
	return True;
  case ButtonPress:
  case ButtonRelease:
	bevent = (SDL_NAME(XDGAButtonEvent)*)event;
	bevent->type = wire->u.u.type & 0x7F;
	bevent->serial = _XSetLastRequestRead(dpy, (xGenericReply *)wire);
	bevent->display = dpy;
	bevent->screen = wire->u.event.screen;
	bevent->time = wire->u.event.time;
	bevent->state = wire->u.event.state;
	bevent->button = wire->u.u.detail;
	return True;
  case KeyPress:
  case KeyRelease:
	kevent = (SDL_NAME(XDGAKeyEvent)*)event;
	kevent->type = wire->u.u.type & 0x7F;
	kevent->serial = _XSetLastRequestRead(dpy, (xGenericReply *)wire);
	kevent->display = dpy;
	kevent->screen = wire->u.event.screen;
	kevent->time = wire->u.event.time;
	kevent->state = wire->u.event.state;
	kevent->keycode = wire->u.u.detail;
	return True;
  }

  return False;
}


Bool SDL_NAME(XDGAQueryExtension) (
    Display *dpy,
    int *event_basep,
    int *error_basep
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);

    if (XextHasExtension(info)) {
	*event_basep = info->codes->first_event;
	*error_basep = info->codes->first_error;
	return True;
    } else {
	return False;
    }
}


Bool SDL_NAME(XDGAQueryVersion)(
    Display *dpy,
    int *majorVersion, 
    int *minorVersion
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);
    xXDGAQueryVersionReply rep;
    xXDGAQueryVersionReq *req;

    XDGACheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XDGAQueryVersion, req);
    req->reqType = info->codes->major_opcode;
    req->dgaReqType = X_XDGAQueryVersion;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }
    *majorVersion = rep.majorVersion;
    *minorVersion = rep.minorVersion;
    UnlockDisplay(dpy);
    SyncHandle();
    if (*majorVersion >= 2)
    {
	int i, j;

	for (i = 0, j = info->codes->first_event;
	     i < XF86DGANumberEvents;
	     i++, j++) 
	{
	    XESetWireToEvent (dpy, j, xdga_wire_to_event);
	    XESetEventToWire (dpy, j, xdga_event_to_wire);
	}
	SDL_NAME(XDGASetClientVersion)(dpy);
    }
    return True;
}

Bool SDL_NAME(XDGASetClientVersion)(
    Display	*dpy
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);
    xXDGASetClientVersionReq *req;

    XDGACheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XDGASetClientVersion, req);
    req->reqType = info->codes->major_opcode;
    req->dgaReqType = X_XDGASetClientVersion;
    req->major = XDGA_MAJOR_VERSION;
    req->minor = XDGA_MINOR_VERSION;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool SDL_NAME(XDGAOpenFramebuffer)(
    Display	*dpy,
    int 	screen
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);
    xXDGAOpenFramebufferReply rep;
    xXDGAOpenFramebufferReq *req;
    char *deviceName = NULL;
    Bool ret;

    XDGACheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XDGAOpenFramebuffer, req);
    req->reqType = info->codes->major_opcode;
    req->dgaReqType = X_XDGAOpenFramebuffer;
    req->screen = screen;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }

    if(rep.length) {
	deviceName = Xmalloc(rep.length << 2);
	_XRead(dpy, deviceName, rep.length << 2);
    }

    ret = SDL_NAME(XDGAMapFramebuffer)(screen, deviceName,
				(unsigned char*)(long)rep.mem1, 
				rep.size, rep.offset, rep.extra);

    if(deviceName)
	Xfree(deviceName);	

    UnlockDisplay(dpy);
    SyncHandle();
    return ret;
}

void SDL_NAME(XDGACloseFramebuffer)(
    Display	*dpy,
    int		screen
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);
    xXDGACloseFramebufferReq *req;

    XextSimpleCheckExtension (dpy, info, SDL_NAME(xdga_extension_name));

    SDL_NAME(XDGAUnmapFramebuffer)(screen);

    LockDisplay(dpy);
    GetReq(XDGACloseFramebuffer, req);
    req->reqType = info->codes->major_opcode;
    req->dgaReqType = X_XDGACloseFramebuffer;
    req->screen = screen;
    UnlockDisplay(dpy);
    SyncHandle();
}



SDL_NAME(XDGAMode)* SDL_NAME(XDGAQueryModes)(
    Display *dpy,
    int screen,
    int *num
){
    XExtDisplayInfo *dinfo = SDL_NAME(xdga_find_display) (dpy);
    xXDGAQueryModesReply rep;
    xXDGAQueryModesReq *req;
    SDL_NAME(XDGAMode) *modes = NULL;

    *num = 0;

    XDGACheckExtension (dpy, dinfo, NULL);

    LockDisplay(dpy);
    GetReq(XDGAQueryModes, req);
    req->reqType = dinfo->codes->major_opcode;
    req->dgaReqType = X_XDGAQueryModes;
    req->screen = screen;

    if (_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	if(rep.length) {
	   xXDGAModeInfo info;
	   int i, size;
	   char *offset;

	   size = rep.length << 2;
	   size -= rep.number * sz_xXDGAModeInfo; /* find text size */
	   modes = (SDL_NAME(XDGAMode)*)Xmalloc((rep.number * sizeof(SDL_NAME(XDGAMode))) + size);
	   offset = (char*)(&modes[rep.number]); /* start of text */


	   if(modes) {	
	      for(i = 0; i < rep.number; i++) {
		_XRead(dpy, (char*)(&info), sz_xXDGAModeInfo);

		modes[i].num = info.num;
		modes[i].verticalRefresh = 
			(float)info.vsync_num / (float)info.vsync_den;
		modes[i].flags = info.flags;
		modes[i].imageWidth = info.image_width;
		modes[i].imageHeight = info.image_height;
		modes[i].pixmapWidth = info.pixmap_width;
		modes[i].pixmapHeight = info.pixmap_height;
		modes[i].bytesPerScanline = info.bytes_per_scanline;
		modes[i].byteOrder = info.byte_order;
		modes[i].depth = info.depth;
		modes[i].bitsPerPixel = info.bpp;
		modes[i].redMask = info.red_mask;
		modes[i].greenMask = info.green_mask;
		modes[i].blueMask = info.blue_mask;
		modes[i].visualClass = info.visual_class;
		modes[i].viewportWidth = info.viewport_width;
		modes[i].viewportHeight = info.viewport_height;
		modes[i].xViewportStep = info.viewport_xstep;
		modes[i].yViewportStep = info.viewport_ystep;
		modes[i].maxViewportX = info.viewport_xmax;
		modes[i].maxViewportY = info.viewport_ymax;
		modes[i].viewportFlags = info.viewport_flags;
		modes[i].reserved1 = info.reserved1;
		modes[i].reserved2 = info.reserved2;	

		_XRead(dpy, offset, info.name_size);
		modes[i].name = offset;
		offset += info.name_size;
	      }
	      *num = rep.number;
	   } else
		_XEatData(dpy, rep.length << 2);
	}
    }

    UnlockDisplay(dpy);
    SyncHandle();

    return modes;
}


SDL_NAME(XDGADevice) * 
SDL_NAME(XDGASetMode)(
    Display	*dpy,
    int		screen,
    int		mode
){
    XExtDisplayInfo *dinfo = SDL_NAME(xdga_find_display) (dpy);
    xXDGASetModeReply rep;
    xXDGASetModeReq *req;
    SDL_NAME(XDGADevice) *dev = NULL;
    Pixmap pid;

    XDGACheckExtension (dpy, dinfo, NULL);

    LockDisplay(dpy);
    GetReq(XDGASetMode, req);
    req->reqType = dinfo->codes->major_opcode;
    req->dgaReqType = X_XDGASetMode;
    req->screen = screen;
    req->mode = mode;
    req->pid = pid = XAllocID(dpy);
    
    if (_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	if(rep.length) {
	   xXDGAModeInfo info;
	   int size;

	   size = rep.length << 2;
	   size -= sz_xXDGAModeInfo; /* get text size */

	   dev = (SDL_NAME(XDGADevice)*)Xmalloc(sizeof(SDL_NAME(XDGADevice)) + size);
	    
	   if(dev) {
		_XRead(dpy, (char*)(&info), sz_xXDGAModeInfo);

		dev->mode.num = info.num;
		dev->mode.verticalRefresh = 
				(float)info.vsync_num / (float)info.vsync_den;
		dev->mode.flags = info.flags;
		dev->mode.imageWidth = info.image_width;
		dev->mode.imageHeight = info.image_height;
		dev->mode.pixmapWidth = info.pixmap_width;
		dev->mode.pixmapHeight = info.pixmap_height;
		dev->mode.bytesPerScanline = info.bytes_per_scanline;
		dev->mode.byteOrder = info.byte_order;
		dev->mode.depth = info.depth;
		dev->mode.bitsPerPixel = info.bpp;
		dev->mode.redMask = info.red_mask;
		dev->mode.greenMask = info.green_mask;
		dev->mode.blueMask = info.blue_mask;
		dev->mode.visualClass = info.visual_class;
		dev->mode.viewportWidth = info.viewport_width;
		dev->mode.viewportHeight = info.viewport_height;
		dev->mode.xViewportStep = info.viewport_xstep;
		dev->mode.yViewportStep = info.viewport_ystep;
		dev->mode.maxViewportX = info.viewport_xmax;
		dev->mode.maxViewportY = info.viewport_ymax;
		dev->mode.viewportFlags = info.viewport_flags;
		dev->mode.reserved1 = info.reserved1;
		dev->mode.reserved2 = info.reserved2;

		dev->mode.name = (char*)(&dev[1]);	
		_XRead(dpy, dev->mode.name, info.name_size);

		dev->pixmap = (rep.flags & XDGAPixmap) ? pid : 0;
		dev->data = SDL_NAME(XDGAGetMappedMemory)(screen);

		if(dev->data)
		    dev->data += rep.offset;
	   } 
	   /* not sure what to do if the allocation fails */
	}
    }

    UnlockDisplay(dpy);
    SyncHandle();

    return dev;
}


void SDL_NAME(XDGASetViewport)(
    Display	*dpy,
    int		screen,
    int		x,
    int		y,
    int		flags
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);
    xXDGASetViewportReq *req;

    XextSimpleCheckExtension (dpy, info, SDL_NAME(xdga_extension_name));

    LockDisplay(dpy);
    GetReq(XDGASetViewport, req);
    req->reqType = info->codes->major_opcode;
    req->dgaReqType = X_XDGASetViewport;
    req->screen = screen;
    req->x = x;
    req->y = y;
    req->flags = flags;
    UnlockDisplay(dpy);
    SyncHandle();
}


void SDL_NAME(XDGAInstallColormap)(
    Display	*dpy,
    int		screen,
    Colormap	cmap
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);
    xXDGAInstallColormapReq *req;

    XextSimpleCheckExtension (dpy, info, SDL_NAME(xdga_extension_name));

    LockDisplay(dpy);
    GetReq(XDGAInstallColormap, req);
    req->reqType = info->codes->major_opcode;
    req->dgaReqType = X_XDGAInstallColormap;
    req->screen = screen;
    req->cmap = cmap;
    UnlockDisplay(dpy);
    SyncHandle();
}

void SDL_NAME(XDGASelectInput)(
    Display	*dpy,
    int		screen,
    long	mask
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);
    xXDGASelectInputReq *req;

    XextSimpleCheckExtension (dpy, info, SDL_NAME(xdga_extension_name));