sdl_dgavideo.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/*
	SDL - Simple DirectMedia Layer
	Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Library General Public
	License as published by the Free Software Foundation; either
	version 2 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
	Library General Public License for more details.

	You should have received a copy of the GNU Library General Public
	License along with this library; if not, write to the Free
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	Sam Lantinga
	[e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_dgavideo.c,v 1.4 2002/04/22 21:38:04 wmay Exp $";
#endif

/* DGA 2.0 based SDL video driver implementation.
*/

#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <XFree86/extensions/xf86dga.h>

#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif

#include "SDL.h"
#include "SDL_error.h"
#include "SDL_video.h"
#include "SDL_mouse.h"
#include "SDL_sysvideo.h"
#include "SDL_pixels_c.h"
#include "SDL_events_c.h"
#include "SDL_dgavideo.h"
#include "SDL_dgamouse_c.h"
#include "SDL_dgaevents_c.h"

/* Initialization/Query functions */
static int DGA_VideoInit(_THIS, SDL_PixelFormat *vformat);
static SDL_Rect **DGA_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
static SDL_Surface *DGA_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
static int DGA_SetColors(_THIS, int firstcolor, int ncolors,
			 SDL_Color *colors);
static int DGA_SetGammaRamp(_THIS, Uint16 *ramp);
static void DGA_VideoQuit(_THIS);

/* Hardware surface functions */
static int DGA_InitHWSurfaces(_THIS, SDL_Surface *screen, Uint8 *base, int size);
static void DGA_FreeHWSurfaces(_THIS);
static int DGA_AllocHWSurface(_THIS, SDL_Surface *surface);
static int DGA_FillHWRect(_THIS, SDL_Surface *dst, SDL_Rect *rect, Uint32 color);
static int DGA_CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst);
static int DGA_LockHWSurface(_THIS, SDL_Surface *surface);
static void DGA_UnlockHWSurface(_THIS, SDL_Surface *surface);
static void DGA_FreeHWSurface(_THIS, SDL_Surface *surface);
static int DGA_FlipHWSurface(_THIS, SDL_Surface *surface);

/* DGA driver bootstrap functions */

static int DGA_Available(void)
{
	const char *display;
	Display *dpy;
	int available;

	/* The driver is available is available if the display is local
	   and the DGA 2.0+ extension is available, and we can map mem.
	*/
	available = 0;
	display = NULL;
	if ( (strncmp(XDisplayName(display), ":", 1) == 0) ||
	     (strncmp(XDisplayName(display), "unix:", 5) == 0) ) {
		dpy = XOpenDisplay(display);
		if ( dpy ) {
			int events, errors, major, minor;

			if ( SDL_NAME(XDGAQueryExtension)(dpy, &events, &errors) &&
			     SDL_NAME(XDGAQueryVersion)(dpy, &major, &minor) ) {
				int screen;

				screen = DefaultScreen(dpy);
				if ( (major >= 2) && 
				     SDL_NAME(XDGAOpenFramebuffer)(dpy, screen) ) {
					available = 1;
					SDL_NAME(XDGACloseFramebuffer)(dpy, screen);
				}
			}
			XCloseDisplay(dpy);
		}
	}
	return(available);
}

static void DGA_DeleteDevice(SDL_VideoDevice *device)
{
	free(device->hidden);
	free(device);
}

static SDL_VideoDevice *DGA_CreateDevice(int devindex)
{
	SDL_VideoDevice *device;

	/* Initialize all variables that we clean on shutdown */
	device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));
	if ( device ) {
		memset(device, 0, (sizeof *device));
		device->hidden = (struct SDL_PrivateVideoData *)
				malloc((sizeof *device->hidden));
	}
	if ( (device == NULL) || (device->hidden == NULL) ) {
		SDL_OutOfMemory();
		if ( device ) {
			free(device);
		}
		return(0);
	}
	memset(device->hidden, 0, (sizeof *device->hidden));

	/* Set the function pointers */
	device->VideoInit = DGA_VideoInit;
	device->ListModes = DGA_ListModes;
	device->SetVideoMode = DGA_SetVideoMode;
	device->SetColors = DGA_SetColors;
	device->UpdateRects = NULL;
	device->VideoQuit = DGA_VideoQuit;
	device->AllocHWSurface = DGA_AllocHWSurface;
	device->CheckHWBlit = DGA_CheckHWBlit;
	device->FillHWRect = DGA_FillHWRect;
	device->SetHWColorKey = NULL;
	device->SetHWAlpha = NULL;
	device->LockHWSurface = DGA_LockHWSurface;
	device->UnlockHWSurface = DGA_UnlockHWSurface;
	device->FlipHWSurface = DGA_FlipHWSurface;
	device->FreeHWSurface = DGA_FreeHWSurface;
	device->SetGammaRamp = DGA_SetGammaRamp;
	device->GetGammaRamp = NULL;
	device->SetCaption = NULL;
	device->SetIcon = NULL;
	device->IconifyWindow = NULL;
	device->GrabInput = NULL;
	device->GetWMInfo = NULL;
	device->InitOSKeymap = DGA_InitOSKeymap;
	device->PumpEvents = DGA_PumpEvents;

	device->free = DGA_DeleteDevice;

	return device;
}

VideoBootStrap DGA_bootstrap = {
	"dga", "XFree86 DGA 2.0",
	DGA_Available, DGA_CreateDevice
};

static int DGA_AddMode(_THIS, int bpp, int w, int h)
{
	SDL_Rect *mode;
	int i, index;
	int next_mode;

	/* Check to see if we already have this mode */
	if ( bpp < 8 ) {  /* Not supported */
		return(0);
	}
	index = ((bpp+7)/8)-1;
	for ( i=0; i<SDL_nummodes[index]; ++i ) {
		mode = SDL_modelist[index][i];
		if ( (mode->w == w) && (mode->h == h) ) {
			return(0);
		}
	}

	/* Set up the new video mode rectangle */
	mode = (SDL_Rect *)malloc(sizeof *mode);
	if ( mode == NULL ) {
		SDL_OutOfMemory();
		return(-1);
	}
	mode->x = 0;
	mode->y = 0;
	mode->w = w;
	mode->h = h;

	/* Allocate the new list of modes, and fill in the new mode */
	next_mode = SDL_nummodes[index];
	SDL_modelist[index] = (SDL_Rect **)
	       realloc(SDL_modelist[index], (1+next_mode+1)*sizeof(SDL_Rect *));
	if ( SDL_modelist[index] == NULL ) {
		SDL_OutOfMemory();
		SDL_nummodes[index] = 0;
		free(mode);
		return(-1);
	}
	SDL_modelist[index][next_mode] = mode;
	SDL_modelist[index][next_mode+1] = NULL;
	SDL_nummodes[index]++;

	return(0);
}

/* This whole function is a hack. :) */
static Uint32 get_video_size(_THIS)
{
	/* This is a non-exported function from libXxf86dga.a */
	extern unsigned char *SDL_NAME(XDGAGetMappedMemory)(int screen);
	FILE *proc;
	unsigned long mem;
	unsigned start, stop;
	char line[BUFSIZ];
	Uint32 size;

	mem = (unsigned long)SDL_NAME(XDGAGetMappedMemory)(DGA_Screen);
	size = 0;
	proc = fopen("/proc/self/maps", "r");
	if ( proc ) {
		while ( fgets(line, sizeof(line)-1, proc) ) {
			sscanf(line, "%x-%x", &start, &stop);
			if ( start == mem ) {
				size = (Uint32)((stop-start)/1024);
				break;
			}
		}
		fclose(proc);
	}
	return(size);
}

#ifdef DGA_DEBUG
static void PrintMode(SDL_NAME(XDGAMode) *mode)
{
	printf("Mode: %s (%dx%d) at %d bpp (%f refresh, %d pitch) num: %d\n",
		mode->name,
		mode->viewportWidth, mode->viewportHeight,
		mode->depth == 24 ? mode->bitsPerPixel : mode->depth,
		mode->verticalRefresh, mode->bytesPerScanline, mode->num);
	printf("\tRGB: 0x%8.8x 0x%8.8x 0x%8.8x (%d - %s)\n",
		mode->redMask, mode->greenMask, mode->blueMask,
		mode->visualClass,
		mode->visualClass == TrueColor ? "truecolor" :
		mode->visualClass == DirectColor ? "directcolor" :
		mode->visualClass == PseudoColor ? "pseudocolor" : "unknown");
	printf("\tFlags: ");
	if ( mode->flags & XDGAConcurrentAccess )
		printf(" XDGAConcurrentAccess");
	if ( mode->flags & XDGASolidFillRect )
		printf(" XDGASolidFillRect");
	if ( mode->flags & XDGABlitRect )
		printf(" XDGABlitRect");
	if ( mode->flags & XDGABlitTransRect )
		printf(" XDGABlitTransRect");
	if ( mode->flags & XDGAPixmap )
		printf(" XDGAPixmap");
	if ( mode->flags & XDGAInterlaced )
		printf(" XDGAInterlaced");
	if ( mode->flags & XDGADoublescan )
		printf(" XDGADoublescan");
	if ( mode->viewportFlags & XDGAFlipRetrace )
		printf(" XDGAFlipRetrace");
	if ( mode->viewportFlags & XDGAFlipImmediate )
		printf(" XDGAFlipImmediate");
	printf("\n");
}
#endif /* DGA_DEBUG */

static int cmpmodes(const void *va, const void *vb)
{
    const SDL_NAME(XDGAMode) *a = (const SDL_NAME(XDGAMode) *)va;
    const SDL_NAME(XDGAMode) *b = (const SDL_NAME(XDGAMode) *)vb;

    /* Prefer DirectColor visuals for otherwise equal modes */
    if ( (a->viewportWidth == b->viewportWidth) &&
         (b->viewportHeight == a->viewportHeight) ) {
         if ( a->visualClass == DirectColor )
             return -1;
         if ( b->visualClass == DirectColor )
             return 1;
         return 0;
    } else {
        if(a->viewportWidth > b->viewportWidth)
            return -1;
        return b->viewportHeight - a->viewportHeight;
    }
}
static void UpdateHWInfo(_THIS, SDL_NAME(XDGAMode) *mode)
{
	this->info.wm_available = 0;
	this->info.hw_available = 1;
	if ( mode->flags & XDGABlitRect ) {
		this->info.blit_hw = 1;
	} else {
		this->info.blit_hw = 0;
	}
	if ( mode->flags & XDGABlitTransRect ) {
		this->info.blit_hw_CC = 1;
	} else {
		this->info.blit_hw_CC = 0;
	}
	if ( mode->flags & XDGASolidFillRect ) {
		this->info.blit_fill = 1;
	} else {
		this->info.blit_fill = 0;
	}
	this->info.video_mem = get_video_size(this);
}

static int DGA_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
	const char *display;
	int event_base, error_base;
	int major_version, minor_version;
	Visual *visual;
	SDL_NAME(XDGAMode) *modes;
	int i, num_modes;

	/* Open the X11 display */
	display = NULL;		/* Get it from DISPLAY environment variable */

	DGA_Display = XOpenDisplay(display);
	if ( DGA_Display == NULL ) {
		SDL_SetError("Couldn't open X11 display");
		return(-1);
	}

	/* Check for the DGA extension */
	if ( ! SDL_NAME(XDGAQueryExtension)(DGA_Display, &event_base, &error_base) ||
	     ! SDL_NAME(XDGAQueryVersion)(DGA_Display, &major_version, &minor_version) ) {
		SDL_SetError("DGA extension not available");
		XCloseDisplay(DGA_Display);
		return(-1);
	}
	if ( major_version < 2 ) {
		SDL_SetError("DGA driver requires DGA 2.0 or newer");
		XCloseDisplay(DGA_Display);
		return(-1);
	}
	DGA_event_base = event_base;

	/* Determine the current screen depth */
	visual = DefaultVisual(DGA_Display, DGA_Screen);
	{
		XPixmapFormatValues *pix_format;
		int i, num_formats;

		vformat->BitsPerPixel = DefaultDepth(DGA_Display, DGA_Screen);
		pix_format = XListPixmapFormats(DGA_Display, &num_formats);
		if ( pix_format == NULL ) {
			SDL_SetError("Couldn't determine screen formats");
			XCloseDisplay(DGA_Display);
			return(-1);
		}
		for ( i=0; i<num_formats; ++i ) {
			if ( vformat->BitsPerPixel == pix_format[i].depth )
				break;
		}
		if ( i != num_formats )
			vformat->BitsPerPixel = pix_format[i].bits_per_pixel;
		XFree((char *)pix_format);
	}
	if ( vformat->BitsPerPixel > 8 ) {
		vformat->Rmask = visual->red_mask;
		vformat->Gmask = visual->green_mask;
		vformat->Bmask = visual->blue_mask;
	}

	/* Open access to the framebuffer */
	if ( ! SDL_NAME(XDGAOpenFramebuffer)(DGA_Display, DGA_Screen) ) {
		SDL_SetError("Unable to map the video memory");
		XCloseDisplay(DGA_Display);
		return(-1);
	}

	/* Query for the list of available video modes */
	modes = SDL_NAME(XDGAQueryModes)(DGA_Display, DGA_Screen, &num_modes);
	qsort(modes, num_modes, sizeof *modes, cmpmodes);
	for ( i=0; i<num_modes; ++i ) {
#ifdef DGA_DEBUG
		PrintMode(&modes[i]);
#endif
		if ( (modes[i].visualClass == PseudoColor) ||
		     (modes[i].visualClass == DirectColor) ||
		     (modes[i].visualClass == TrueColor) ) {
			DGA_AddMode(this, modes[i].bitsPerPixel,
			            modes[i].viewportWidth,
			            modes[i].viewportHeight);
		}
	}
	UpdateHWInfo(this, modes);
	XFree(modes);

	/* Create the hardware surface lock mutex */
	hw_lock = SDL_CreateMutex();
	if ( hw_lock == NULL ) {
		SDL_SetError("Unable to create lock mutex");
		DGA_VideoQuit(this);
		return(-1);
	}

#ifdef LOCK_DGA_DISPLAY
	/* Create the event lock so we're thread-safe.. :-/ */
	event_lock = SDL_CreateMutex();
#endif /* LOCK_DGA_DISPLAY */

	/* We're done! */
	return(0);
}

SDL_Rect **DGA_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
	return(SDL_modelist[((format->BitsPerPixel+7)/8)-1]);
}

/* Various screen update functions available */
static void DGA_DirectUpdate(_THIS, int numrects, SDL_Rect *rects);

SDL_Surface *DGA_SetVideoMode(_THIS, SDL_Surface *current,
				int width, int height, int bpp, Uint32 flags)
{
	SDL_NAME(XDGAMode) *modes;
	int i, num_modes;
	SDL_NAME(XDGADevice) *mode;
	int screen_len;
	Uint8 *surfaces_mem;
	int surfaces_len;

	/* Free any previous colormap */
	if ( DGA_colormap ) {
		XFreeColormap(DGA_Display, DGA_colormap);
		DGA_colormap = 0;
	}

	/* Search for a matching video mode */
	modes = SDL_NAME(XDGAQueryModes)(DGA_Display, DGA_Screen, &num_modes);
	qsort(modes, num_modes, sizeof *modes, cmpmodes);
	for ( i=0; i<num_modes; ++i ) {
		int depth;

		
		depth = modes[i].depth;
		if ( depth == 24 ) { /* Distinguish between 24 and 32 bpp */
			depth = modes[i].bitsPerPixel;
		}
		if ( (depth == bpp) &&
		     (modes[i].viewportWidth == width) &&
		     (modes[i].viewportHeight == height) &&
		     ((modes[i].visualClass == PseudoColor) ||
		      (modes[i].visualClass == DirectColor) ||
		      (modes[i].visualClass == TrueColor)) ) {
			break;
		}
	}
	if ( i == num_modes ) {
		SDL_SetError("No matching video mode found");
		return(NULL);
	}

	/* Set the video mode */
	mode = SDL_NAME(XDGASetMode)(DGA_Display, DGA_Screen, modes[i].num);
	XFree(modes);
	if ( mode == NULL ) {
		SDL_SetError("Unable to switch to requested mode");
		return(NULL);
	}
	DGA_visualClass = modes[i].visualClass;
	memory_base = (Uint8 *)mode->data;
	memory_pitch = mode->mode.bytesPerScanline;

	/* Set up the new mode framebuffer */
	current->flags = (SDL_FULLSCREEN|SDL_HWSURFACE);
	current->w = mode->mode.viewportWidth;
	current->h = mode->mode.viewportHeight;
	current->pitch = memory_pitch;
	current->pixels = memory_base;
	if ( ! SDL_ReallocFormat(current, mode->mode.bitsPerPixel,
	                                  mode->mode.redMask,
	                                  mode->mode.greenMask,
	                                  mode->mode.blueMask, 0) ) {
		return(NULL);
	}
	screen_len = current->h*current->pitch;

	/* Create a colormap if necessary */
	if ( (DGA_visualClass == PseudoColor) ||
             (DGA_visualClass == DirectColor) ) {
		DGA_colormap = SDL_NAME(XDGACreateColormap)(DGA_Display, DGA_Screen,
							mode, AllocAll);
		if ( DGA_visualClass == PseudoColor ) {
			current->flags |= SDL_HWPALETTE;
		} else {
	    		/* Initialize the colormap to the identity mapping */
	    		SDL_GetGammaRamp(0, 0, 0);
	    		this->screen = current;
	    		DGA_SetGammaRamp(this, this->gamma);
			this->screen = NULL;
		}
	} else {
		DGA_colormap = SDL_NAME(XDGACreateColormap)(DGA_Display, DGA_Screen,
							mode, AllocNone);
	}
	SDL_NAME(XDGAInstallColormap)(DGA_Display, DGA_Screen, DGA_colormap);

	/* Update the hardware capabilities */
	UpdateHWInfo(this, &mode->mode);

	/* Set up the information for hardware surfaces */
	surfaces_mem = (Uint8 *)current->pixels + screen_len;
	surfaces_len = (mode->mode.imageHeight*current->pitch - screen_len);

	/* Update for double-buffering, if we can */
	SDL_NAME(XDGASetViewport)(DGA_Display, DGA_Screen, 0, 0, XDGAFlipRetrace);
	if ( flags & SDL_DOUBLEBUF ) {
		if ( mode->mode.imageHeight >= (current->h*2) ) {
			current->flags |= SDL_DOUBLEBUF;
			flip_page = 0;
			flip_yoffset[0] = 0;
			flip_yoffset[1] = current->h;
			flip_address[0] = memory_base;
			flip_address[1] = memory_base+screen_len;
			surfaces_mem += screen_len;
			surfaces_len -= screen_len;