sdl_gsvideo.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  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_gsvideo.c,v 1.3 2002/04/22 21:38:05 wmay Exp $";
#endif

/* Framebuffer console based SDL video driver implementation.
*/

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>

#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_cursor_c.h"
#include "SDL_gsvideo.h"
#include "SDL_gsmouse_c.h"
#include "SDL_gsevents_c.h"
#include "SDL_gsyuv_c.h"


/* Initialization/Query functions */
static int GS_VideoInit(_THIS, SDL_PixelFormat *vformat);
static SDL_Rect **GS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
static SDL_Surface *GS_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
static int GS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
static void GS_VideoQuit(_THIS);

/* Hardware surface functions */
static int GS_AllocHWSurface(_THIS, SDL_Surface *surface);
static int GS_LockHWSurface(_THIS, SDL_Surface *surface);
static void GS_UnlockHWSurface(_THIS, SDL_Surface *surface);
static void GS_FreeHWSurface(_THIS, SDL_Surface *surface);

/* GS driver bootstrap functions */

static int GS_Available(void)
{
	int console, memory;

	console = open(PS2_DEV_GS, O_RDWR, 0);
	if ( console >= 0 ) {
		close(console);
	}
	memory = open(PS2_DEV_MEM, O_RDWR, 0);
	if ( memory >= 0 ) {
		close(memory);
	}
	return((console >= 0) && (memory >= 0));
}

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

static SDL_VideoDevice *GS_CreateDevice(int devindex)
{
	SDL_VideoDevice *this;

	/* Initialize all variables that we clean on shutdown */
	this = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));
	if ( this ) {
		memset(this, 0, (sizeof *this));
		this->hidden = (struct SDL_PrivateVideoData *)
				malloc((sizeof *this->hidden));
	}
	if ( (this == NULL) || (this->hidden == NULL) ) {
		SDL_OutOfMemory();
		if ( this ) {
			free(this);
		}
		return(0);
	}
	memset(this->hidden, 0, (sizeof *this->hidden));
	mouse_fd = -1;
	keyboard_fd = -1;

	/* Set the function pointers */
	this->VideoInit = GS_VideoInit;
	this->ListModes = GS_ListModes;
	this->SetVideoMode = GS_SetVideoMode;
	this->CreateYUVOverlay = GS_CreateYUVOverlay;
	this->SetColors = GS_SetColors;
	this->UpdateRects = NULL;
	this->VideoQuit = GS_VideoQuit;
	this->AllocHWSurface = GS_AllocHWSurface;
	this->CheckHWBlit = NULL;
	this->FillHWRect = NULL;
	this->SetHWColorKey = NULL;
	this->SetHWAlpha = NULL;
	this->LockHWSurface = GS_LockHWSurface;
	this->UnlockHWSurface = GS_UnlockHWSurface;
	this->FlipHWSurface = NULL;
	this->FreeHWSurface = GS_FreeHWSurface;
	this->SetIcon = NULL;
	this->SetCaption = NULL;
	this->GetWMInfo = NULL;
	this->FreeWMCursor = GS_FreeWMCursor;
	this->CreateWMCursor = GS_CreateWMCursor;
	this->ShowWMCursor = GS_ShowWMCursor;
	this->MoveWMCursor = GS_MoveWMCursor;
	this->InitOSKeymap = GS_InitOSKeymap;
	this->PumpEvents = GS_PumpEvents;

	this->free = GS_DeleteDevice;

	return this;
}

VideoBootStrap PS2GS_bootstrap = {
	"ps2gs", "PlayStation 2 Graphics Synthesizer",
	GS_Available, GS_CreateDevice
};

/* These are the pixel formats for the 32, 24, and 16 bit video modes */
static struct {
	int bpp;
	Uint32 r;
	Uint32 g;
	Uint32 b;
} GS_pixelmasks[] = {
	{ 32, 0x000000FF,	/* RGB little-endian */
	      0x0000FF00,
	      0x00FF0000 },
	{ 24, 0x000000FF,	/* RGB little-endian */
	      0x0000FF00,
	      0x00FF0000 },
	{ 16, 0x0000001f,	/* RGB little-endian */
	      0x000003e0,
	      0x00007c00 },
};
/* This is a mapping from SDL bytes-per-pixel to GS pixel format */
static int GS_formatmap[] = {
	-1,		/* 0 bpp, not a legal value */
	-1,		/* 8 bpp, not supported (yet?) */
	PS2_GS_PSMCT16,	/* 16 bpp */
	PS2_GS_PSMCT24,	/* 24 bpp */
	PS2_GS_PSMCT32	/* 32 bpp */
};

static unsigned long long head_tags[] __attribute__((aligned(16))) = {
	4 | (1LL << 60),	/* GIFtag */
	0x0e,			/* A+D */
	0,			/* 2 */
	PS2_GS_BITBLTBUF,
	0,			/* 4 */
	PS2_GS_TRXPOS,
	0,			/* 6 */
	PS2_GS_TRXREG,
	0,			/* 8 */
	PS2_GS_TRXDIR
};

#define MAXIMG		(32767 * 16)
#define MAXTAGS		8

static inline int loadimage_nonblock(int fd, struct ps2_image *image, int size,
                                     unsigned long long *hm,
                                     unsigned long long *im)
{
	struct ps2_plist plist;
	struct ps2_packet packet[1 + MAXTAGS * 2];
	int isize;
	int pnum, it, eop;
	char *data;

	/* initialize the variables */
	data = (char *)image->ptr;
	pnum = it = eop = 0;
	plist.packet = packet;

	/* make BITBLT packet */
	packet[pnum].ptr = hm;
	packet[pnum].len = sizeof(head_tags);
	pnum++;
	hm[2] = ((unsigned long long)image->fbp << 32) |
	        ((unsigned long long)image->fbw << 48) |
	        ((unsigned long long)image->psm << 56);
	hm[4] = ((unsigned long long)image->x << 32) |
	        ((unsigned long long)image->y << 48);
	hm[6] = (unsigned long long)image->w |
	        ((unsigned long long)image->h << 32);

	/* make image mode tags */
	while (!eop) {
		isize = size > MAXIMG ? MAXIMG : size;
		size -= isize;
		eop = (size == 0);

		packet[pnum].ptr = &im[it];
		packet[pnum].len = sizeof(unsigned long long) * 2;
		pnum++;
		im[it++] = (isize >> 4) | (eop ? (1 << 15) : 0) | (2LL << 58);
		im[it++] = 0;

		packet[pnum].ptr = (void *)data;
		packet[pnum].len = isize;
		pnum++;
		data += isize;
	}
	plist.num = pnum;

	return ioctl(fd, PS2IOC_SENDL, &plist);
}

static unsigned long long tex_tags[] __attribute__((aligned(16))) = {
	3 | (1LL << 60),	/* GIFtag */
	0x0e,			/* A+D */
	0,			/* 2 */
	PS2_GS_TEX0_1,
	(1 << 5) + (1 << 6),
	PS2_GS_TEX1_1,
	0,
	PS2_GS_TEXFLUSH
};
static unsigned long long scale_tags[] __attribute__((aligned(16))) = {
	5 | (1LL << 60),	/* GIFtag */
	0x0e,			/* A+D */
	6 + (1 << 4) + (1 << 8),
	PS2_GS_PRIM,
	((unsigned long long)0 * 16) + (((unsigned long long)0 * 16) << 16),
	PS2_GS_UV,
	((unsigned long long)0 * 16) + (((unsigned long long)0 * 16) << 16),
	PS2_GS_XYZ2,
	0,			/* 8 */
	PS2_GS_UV,
	0,			/* 10 */
	PS2_GS_XYZ2
};


int scaleimage_nonblock(int fd, unsigned long long *tm, unsigned long long *sm)
{
	struct ps2_plist plist;
	struct ps2_packet packet[2];

	/* initialize the variables */
	plist.num = 2;
	plist.packet = packet;

	packet[0].ptr = tm;
	packet[0].len = sizeof(tex_tags);
	packet[1].ptr = sm;
	packet[1].len = sizeof(scale_tags);

	return ioctl(fd, PS2IOC_SENDL, &plist);
}

static int power_of_2(int value)
{
	int shift;

	for ( shift = 0; (1<<shift) < value; ++shift ) {
		/* Keep looking */ ;
	}
	return(shift);
}

static int GS_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
	struct ps2_screeninfo vinfo;

	/* Initialize the library */
	console_fd = open(PS2_DEV_GS, O_RDWR, 0);
	if ( console_fd < 0 ) {
		SDL_SetError("Unable to open %s", PS2_DEV_GS);
		return(-1);
	}
	memory_fd = open(PS2_DEV_MEM, O_RDWR, 0);
	if ( memory_fd < 0 ) {
		close(console_fd);
		console_fd = -1;
		SDL_SetError("Unable to open %s", PS2_DEV_MEM);
		return(-1);
	}

	/* Determine the current screen depth */
	if ( ioctl(console_fd, PS2IOC_GSCREENINFO, &vinfo) < 0 ) {
		close(memory_fd);
		close(console_fd);
		console_fd = -1;
		SDL_SetError("Couldn't get console pixel format");
		return(-1);
	}
	switch (vinfo.psm) {
	    /* Supported pixel formats */
	    case PS2_GS_PSMCT32:
	    case PS2_GS_PSMCT24:
	    case PS2_GS_PSMCT16:
		break;
	    default:
		GS_VideoQuit(this);
		SDL_SetError("Unknown console pixel format: %d", vinfo.psm);
		return(-1);
	}
	vformat->BitsPerPixel = GS_pixelmasks[vinfo.psm].bpp;
	vformat->Rmask = GS_pixelmasks[vinfo.psm].r;
	vformat->Gmask = GS_pixelmasks[vinfo.psm].g;
	vformat->Bmask = GS_pixelmasks[vinfo.psm].b;
	saved_vinfo = vinfo;

	/* Enable mouse and keyboard support */
	if ( GS_OpenKeyboard(this) < 0 ) {
		GS_VideoQuit(this);
		SDL_SetError("Unable to open keyboard");
		return(-1);
	}
	if ( GS_OpenMouse(this) < 0 ) {
		const char *sdl_nomouse;

		sdl_nomouse = getenv("SDL_NOMOUSE");
		if ( ! sdl_nomouse ) {
			GS_VideoQuit(this);
			SDL_SetError("Unable to open mouse");
			return(-1);