sdldecode.c

基于SDL的跨平台MPEG4播放器源代码,支持硬件YUV加速

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <SDL/SDL.h>
#include "xvid.h"

#define USE_PNM 1
#define USE_TGA 0

static int SHXDIM = 0;//display size
static int SHYDIM = 0;
static int XDIM = 352;//real size
static int YDIM = 288;
static int ARG_SAVEDECOUTPUT = 0;
static int ARG_SAVEMPEGSTREAM = 0;
static char *ARG_INPUTFILE = NULL;
static int CSP = XVID_CSP_I420;
static int BPP = 1;
static int FORMAT = USE_PNM;
static char filepath[256] = "./";
static void *dec_handle = NULL;
#define BUFFER_SIZE (2*1024*1024)
static const int display_buffer_bytes = 0;
static SDL_Surface *screen;
static SDL_Overlay *overlay;
static SDL_Rect rect;
static double msecond();
static int dec_init(int use_assembler, int debug_level);
static int dec_main(unsigned char *istream,
					unsigned char *ostream,
					int istream_size,
					xvid_dec_stats_t *xvid_dec_stats);
static int dec_stop();
static void usage();
static int write_image(char *prefix, unsigned char *image);
static int write_pnm(char *filename, unsigned char *image);
static int write_tga(char *filename, unsigned char *image);
const char * type2str(int type)
{
    if (type==XVID_TYPE_IVOP)
        return "I";
    if (type==XVID_TYPE_PVOP)
        return "P";
    if (type==XVID_TYPE_BVOP)
        return "B";
    return "S";
}

static void init_SDL()
{
    if (SDL_Init (SDL_INIT_VIDEO) < 0)
    {
        fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
        exit (1);
    }
    atexit (SDL_Quit);
    screen = SDL_SetVideoMode (SHXDIM, SHYDIM, 0, SDL_HWSURFACE 
                                          | SDL_DOUBLEBUF
                                          | SDL_ANYFORMAT
                                          | SDL_RESIZABLE);
    if (screen == NULL)
    {
        fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());
        exit(2);
    }
    if (0 == screen->flags & SDL_HWSURFACE)
    {
        fprintf(stderr,"Can't get hardware surface\n");
        exit(3);
    }
    SDL_WM_SetCaption ("SDL MultiMedia Application", NULL);       
    overlay = SDL_CreateYUVOverlay(XDIM, YDIM, SDL_YV12_OVERLAY, screen);
    if (!overlay)
    {
        fprintf(stderr, "Couldn't create overlay: %s\n", SDL_GetError());
        exit(4);
    }    
    //show the overlay status
    printf("Created %dx%dx%d %s %s overlay\n",overlay->w,overlay->h,overlay->planes,
           overlay->hw_overlay?"hardware":"software",
           overlay->format==SDL_YV12_OVERLAY?"YV12":
           overlay->format==SDL_IYUV_OVERLAY?"IYUV":
           overlay->format==SDL_YUY2_OVERLAY?"YUY2":
           overlay->format==SDL_UYVY_OVERLAY?"UYVY":
           overlay->format==SDL_YVYU_OVERLAY?"YVYU":
           "Unknown");
    rect.x=0;
    rect.y=0;
    rect.w=SHXDIM;
    rect.h=SHYDIM;
}

int main(int argc, char *argv[])
{
	SDL_Event event;
	uint32_t lastftick;
	unsigned char *mp4_buffer = NULL;
	unsigned char *mp4_ptr    = NULL;
	unsigned char *out_buffer = NULL;
	int useful_bytes;
	xvid_dec_stats_t xvid_dec_stats;
	
	double totaldectime;
  
	long totalsize;
	int status;
	int fps = 25;
    int fpsdelay;
	int paused=0;
    int resized=0;  
	int use_assembler = 1;
	int debug_level = 0;
  
	char filename[256];
  
	FILE *in_file;
	int filenr;
	int i;

	for (i=1; i< argc; i++) {
 
		if (strcmp("-asm", argv[i]) == 0 ) {
			use_assembler = 1;
		} else if (strcmp("-debug", argv[i]) == 0 && i < argc - 1 ) {
			i++;
			if (sscanf(argv[i], "0x%x", &debug_level) != 1) {
				debug_level = atoi(argv[i]);
			}
		} else if (strcmp("-d", argv[i]) == 0) {
			ARG_SAVEDECOUTPUT = 1;
		} else if (strcmp("-i", argv[i]) == 0 && i < argc - 1 ) {
			i++;
			ARG_INPUTFILE = argv[i];
		} else if (strcmp("-c", argv[i]) == 0  && i < argc - 1 ) {
			i++;
			if (strcmp(argv[i], "rgb16") == 0) {
				CSP = XVID_CSP_RGB555;
				BPP = 2;
			} else if (strcmp(argv[i], "rgb24") == 0) {
				CSP = XVID_CSP_BGR;
				BPP = 3;
			} else if (strcmp(argv[i], "rgb32") == 0) {
				CSP = XVID_CSP_BGRA;
				BPP = 4;
			} else if (strcmp(argv[i], "yv12") == 0) {
				CSP = XVID_CSP_YV12;
				BPP = 1;
			} else {
				CSP = XVID_CSP_I420;
				BPP = 1;
			}
		} else if (strcmp("-f", argv[i]) == 0 && i < argc -1) {
			i++;
			if (strcmp(argv[i], "tga") == 0) {
				FORMAT = USE_TGA;
			} else {
				FORMAT = USE_PNM;
			}
		} else if (strcmp("-help", argv[i]) == 0) {
			usage();
			return(0);
		} else if(strcmp("-w", argv[i]) == 0 && i < argc -1){
            i++;
            SHXDIM = atoi(argv[i]);
        } else if(strcmp("-h", argv[i]) == 0 && i < argc -1){
            i++;
            SHYDIM = atoi(argv[i]);
        } else if(strcmp("-fps", argv[i]) == 0 && i < argc -1){
            i++;
            fps = atoi(argv[i]);
        }  
        else {
			usage();
			exit(-1);
		}
	}
  
	if (ARG_INPUTFILE==NULL) {
		fprintf(stderr, "Warning: MSVC build does not read EOF correctly from stdin. Use the -i switch.\n\n");
	}
    in_file = fopen(ARG_INPUTFILE, "rb");
    if (in_file == NULL) {
			fprintf(stderr, "Error opening input file %s\n", ARG_INPUTFILE);
			return(-1);
    }

	/* PNM/PGM format can't handle 16/32 bit data */
	if (BPP != 1 && BPP != 3 && FORMAT == USE_PNM) {
		FORMAT = USE_TGA;
	}

	/* Memory for encoded mp4 stream */
	mp4_buffer = (unsigned char *) malloc(BUFFER_SIZE);
	if (!mp4_buffer)
		goto free_all_memory;
	out_buffer = (unsigned char *)malloc(XDIM*YDIM*3/2); 
	if (!out_buffer)
		goto free_all_memory;	
/******************************************************************************
*        INIT SDL
*******************************************************************************/        
    init_SDL();    

        
/*****************************************************************************
 *        XviD PART  Start
 ****************************************************************************/

	status = dec_init(use_assembler, debug_level);
	if (status) {
		fprintf(stderr,
				"Decore INIT problem, return value %d\n", status);
		goto release_all;
	}        

/*****************************************************************************
 *	                         Main loop
 ****************************************************************************/

	/* Fill the buffer ,create 2M buffer*/
	useful_bytes = fread(mp4_buffer, 1, BUFFER_SIZE, in_file);

	totaldectime = 0;
	totalsize = 0;
	filenr = 0;
	mp4_ptr = mp4_buffer;
    uint8_t  *outy,*outu,*outv,*op[3];
	int y; 
    /* set the start frame */
    i=0;
    fpsdelay=1000/fps;

	lastftick=SDL_GetTicks();	
	do 
	{		
		int used_bytes = 0;
		double dectime;
		while (SDL_PollEvent(&event))
        {
            switch (event.type)
            {
                case SDL_VIDEORESIZE:
                     screen=SDL_SetVideoMode(event.resize.w, event.resize.h, 0, SDL_RESIZABLE | SDL_SWSURFACE);
                     rect.w=event.resize.w;
                     rect.h=event.resize.h;
                     if (paused)
                     {
                         resized=1;
                     }
                     break;
                case SDL_KEYDOWN:
                     if (event.key.keysym.sym == SDLK_SPACE)
                     {
                         paused=!paused;
                         break;
                     }
                     if (event.key.keysym.sym != SDLK_ESCAPE)
                     {
					     goto release_all;
                     }
                case SDL_QUIT:
                     goto release_all;
            }
        }
		/*
		* If the buffer is half empty or there are no more bytes in it
		* then fill it.
		*/
		if (mp4_ptr > mp4_buffer + BUFFER_SIZE/2) 
		{
            int already_in_buffer = (mp4_buffer + BUFFER_SIZE - mp4_ptr);
		    /* Move data if needed */
		    if (already_in_buffer > 0)
                memcpy(mp4_buffer, mp4_ptr, already_in_buffer);
		    /* Update mp4_ptr */
		    mp4_ptr = mp4_buffer; 
		    /* read new data */
    		if(feof(in_file))
				        break;
            useful_bytes += fread(mp4_buffer + already_in_buffer,
								     1, BUFFER_SIZE - already_in_buffer,
								       in_file);

        }
		if ((!paused)||(resized))
		{
	        if (((SDL_GetTicks()-lastftick)>fpsdelay)||(resized))
	        {
	            lastftick=SDL_GetTicks();
				/* This loop is needed to handle VOL/NVOP reading */
				do{
				    /* Decode frame */
            		dectime = msecond();			
            		used_bytes = dec_main(mp4_ptr, out_buffer, useful_bytes, &xvid_dec_stats);
            		dectime = msecond() - dectime;
					if(xvid_dec_stats.type==XVID_TYPE_VOL 
			  		  && (xvid_dec_stats.data.vol.width != XDIM
			     	    ||xvid_dec_stats.data.vol.height != YDIM))
     				{
				 		//reallocate bigger out frame
						free(out_buffer);
						XDIM = xvid_dec_stats.data.vol.width;
				 		YDIM = xvid_dec_stats.data.vol.height; 
				 		out_buffer = (unsigned char *) malloc(XDIM*YDIM*3/2); 		   		 
				 		if (!out_buffer)
				     	    goto free_all_memory;
  	                   
						 //reallocate bigger yuv overlay
  	                   	 
					     SDL_FreeYUVOverlay(overlay);
    				   	 overlay = SDL_CreateYUVOverlay(XDIM, YDIM, SDL_YV12_OVERLAY, screen);
    				   	 if (!overlay)
    				   	 {
        			       fprintf(stderr, "Couldn't create overlay: %s\n", SDL_GetError());
        				   exit(4);
   	                     }			  
  	                   
  					}		   		 
					/* Update buffer pointers */
					if(used_bytes > 0) {
					    mp4_ptr += used_bytes;
						useful_bytes -= used_bytes;
						/* Total size */
						totalsize += used_bytes;
					}
                }while (xvid_dec_stats.type <= 0 && useful_bytes > 0);
				/* Check if there is a negative number of useful bytes left in buffer
		 		* This means we went too far */
        		if(useful_bytes < 0)
            	    break;
 				/* Updated data - Count only usefull decode time */
				totaldectime += dectime;
        		//display the decoded frame
        		SDL_LockSurface(screen);
        		SDL_LockYUVOverlay(overlay);
				outy = out_buffer;
				outu = out_buffer+XDIM*YDIM;
				outv = out_buffer+XDIM*YDIM*5/4;
				for(y=0;y<screen->h && y<overlay->h;y++)
				{
				    op[0]=overlay->pixels[0]+overlay->pitches[0]*y;
					op[1]=overlay->pixels[1]+overlay->pitches[1]*(y/2);
					op[2]=overlay->pixels[2]+overlay->pitches[2]*(y/2);			
					memcpy(op[0],outy+y*XDIM,XDIM);
					if(y%2 == 0)
					{
			     	    memcpy(op[1],outu+XDIM/2*y/2,XDIM/2);
				 		memcpy(op[2],outv+XDIM/2*y/2,XDIM/2);	   
    			    }
				}