基于SDL的跨平台MPEG4播放器源代码,支持硬件YUV加速

最新推荐文章于 2022-07-26 01:28:43 发布

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#跨平台 #buffer #image #null #file #initialization

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本文介绍了一个使用XviD解码器进行视频解码的实现案例，涉及初始化解码器、解码每一帧并显示的过程。该程序能够处理不同格式的视频输出，并提供了多种配置选项。

#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); } } SDL_UnlockYUVOverlay(overlay); SDL_UnlockSurface(screen); SDL_DisplayYUVOverlay(overlay, &rect); /* Save output frame if required */ if (ARG_SAVEDECOUTPUT) { sprintf(filename, "%sdec%05d", filepath, filenr); if(write_image(filename, out_buffer)) { fprintf(stderr, "Error writing decoded frame %s/n", filename); } } filenr++; if (resized) resized = 0; } } SDL_Delay(10); } while (useful_bytes>0 || !feof(in_file)); useful_bytes = 0; /* Empty buffer */ /***************************************************************************** * Flush decoder buffers ****************************************************************************/ do { /* Fake vars */ int used_bytes; double dectime; do { dectime = msecond(); used_bytes = dec_main(NULL, out_buffer, -1, &xvid_dec_stats); dectime = msecond() - dectime; } while(used_bytes>=0 && xvid_dec_stats.type <= 0); if (used_bytes < 0) { /* XVID_ERR_END */ break; } /* Updated data - Count only usefull decode time */ totaldectime += dectime; /* Prints some decoding stats */ if (!display_buffer_bytes) { printf("Frame %5d: type = %s, dectime(ms) =%6.1f, length(bytes) =%7d/n", filenr, type2str(xvid_dec_stats.type), dectime, used_bytes); } /* Save output frame if required */ if (ARG_SAVEDECOUTPUT) { sprintf(filename, "%sdec%05d", filepath, filenr); if(write_image(filename, out_buffer)) { fprintf(stderr, "Error writing decoded frame %s/n", filename); } } filenr++; }while(1); /***************************************************************************** * Calculate totals and averages for output, print results ****************************************************************************/ if (filenr>0) { totalsize /= filenr; totaldectime /= filenr; printf("Avg: dectime(ms) =%7.2f, fps =%7.2f, length(bytes) =%7d/n", totaldectime, 1000/totaldectime, (int)totalsize); }else{ printf("Nothing was decoded!/n"); } /***************************************************************************** * XviD PART Stop ****************************************************************************/ release_all: SDL_FreeYUVOverlay(overlay); if (dec_handle) { status = dec_stop(); if (status) fprintf(stderr, "decore RELEASE problem return value %d/n", status); } free_all_memory: free(out_buffer); free(mp4_buffer); return 0; } /***************************************************************************** * Usage function ****************************************************************************/ static void usage() { fprintf(stderr, "Usage : xvid_decraw [OPTIONS]/n"); fprintf(stderr, "Options :/n"); fprintf(stderr, " -asm : use assembly optimizations (default=disabled)/n"); fprintf(stderr, " -i string : input filename (default=stdin)/n"); fprintf(stderr, " -d : save decoder output/n"); fprintf(stderr, " -f format : choose output file format (tga, pnm, pgm)/n"); fprintf(stderr, " -w width : init window width/n"); fprintf(stderr, " -h height : init window height/n"); fprintf(stderr, " -help : This help message/n"); fprintf(stderr, " (* means default)/n"); } /* return the current time in milli seconds */ static double msecond() { clock_t clk; clk = clock(); return(clk * 1000 / CLOCKS_PER_SEC); } static int write_image(char *prefix, unsigned char *image) { char filename[1024]; char *ext; int ret; if (FORMAT == USE_PNM && BPP == 1) { ext = "pgm"; } else if (FORMAT == USE_PNM && BPP == 3) { ext = "pnm"; } else if (FORMAT == USE_TGA) { ext = "tga"; } else { fprintf(stderr, "Bug: should not reach this path code -- please report to xvid-devel@xvid.org with command line options used"); exit(-1); } sprintf(filename, "%s.%s", prefix, ext); if (FORMAT == USE_PNM) { ret = write_pnm(filename, image); } else { ret = write_tga(filename, image); } return(ret); } static int write_tga(char *filename, unsigned char *image) { FILE * f; char hdr[18]; f = fopen(filename, "wb"); if ( f == NULL) { return -1; } hdr[0] = 0; /* ID length */ hdr[1] = 0; /* Color map type */ hdr[2] = (BPP>1)?2:3; /* Uncompressed true color (2) or greymap (3) */ hdr[3] = 0; /* Color map specification (not used) */ hdr[4] = 0; /* Color map specification (not used) */ hdr[5] = 0; /* Color map specification (not used) */ hdr[6] = 0; /* Color map specification (not used) */ hdr[7] = 0; /* Color map specification (not used) */ hdr[8] = 0; /* LSB X origin */ hdr[9] = 0; /* MSB X origin */ hdr[10] = 0; /* LSB Y origin */ hdr[11] = 0; /* MSB Y origin */ hdr[12] = (XDIM>>0)&0xff; /* LSB Width */ hdr[13] = (XDIM>>8)&0xff; /* MSB Width */ if (BPP > 1) { hdr[14] = (YDIM>>0)&0xff; /* LSB Height */ hdr[15] = (YDIM>>8)&0xff; /* MSB Height */ } else { hdr[14] = ((YDIM*3)>>1)&0xff; /* LSB Height */ hdr[15] = ((YDIM*3)>>9)&0xff; /* MSB Height */ } hdr[16] = BPP*8; hdr[17] = 0x00 | (1<<5) /* Up to down */ | (0<<4); /* Image descriptor */ /* Write header */ fwrite(hdr, 1, sizeof(hdr), f); /* write first plane */ fwrite(image, 1, XDIM*YDIM*BPP, f); /* Write Y and V planes for YUV formats */ if (BPP == 1) { int i; /* Write the two chrominance planes */ for (i=0; i<YDIM/2; i++) { fwrite(image+XDIM*YDIM + i*XDIM/2, 1, XDIM/2, f); fwrite(image+5*XDIM*YDIM/4 + i*XDIM/2, 1, XDIM/2, f); } } /* Close the file */ fclose(f); return(0); } static int write_pnm(char *filename, unsigned char *image) { FILE * f; f = fopen(filename, "wb"); if ( f == NULL) { return -1; } if (BPP == 1) { int i; fprintf(f, "P5/n#xvid/n%i %i/n255/n", XDIM, YDIM*3/2); fwrite(image, 1, XDIM*YDIM, f); for (i=0; i<YDIM/2;i++) { fwrite(image+XDIM*YDIM + i*XDIM/2, 1, XDIM/2, f); fwrite(image+5*XDIM*YDIM/4 + i*XDIM/2, 1, XDIM/2, f); } } else if (BPP == 3) { int i; fprintf(f, "P6/n#xvid/n%i %i/n255/n", XDIM, YDIM); for (i=0; i<XDIM*YDIM*3; i+=3) { fputc(image[i+2], f); fputc(image[i+1], f); fputc(image[i+0], f); } } fclose(f); return 0; } /***************************************************************************** * Routines for decoding: init decoder, use, and stop decoder ****************************************************************************/ /* init decoder before first run */ static int dec_init(int use_assembler, int debug_level) { int ret; xvid_gbl_init_t xvid_gbl_init; xvid_dec_create_t xvid_dec_create; /* Reset the structure with zeros */ memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init_t)); memset(&xvid_dec_create, 0, sizeof(xvid_dec_create_t)); /*------------------------------------------------------------------------ * XviD core initialization *----------------------------------------------------------------------*/ /* Version */ xvid_gbl_init.version = XVID_VERSION; /* Assembly setting */ if(use_assembler) xvid_gbl_init.cpu_flags = 0; else xvid_gbl_init.cpu_flags = XVID_CPU_FORCE; xvid_gbl_init.debug = debug_level; xvid_global(NULL, 0, &xvid_gbl_init, NULL); /*------------------------------------------------------------------------ * XviD encoder initialization *----------------------------------------------------------------------*/ /* Version */ xvid_dec_create.version = XVID_VERSION; /* * Image dimensions -- set to 0, xvidcore will resize when ever it is * needed */ xvid_dec_create.width = 0; xvid_dec_create.height = 0; ret = xvid_decore(NULL, XVID_DEC_CREATE, &xvid_dec_create, NULL); dec_handle = xvid_dec_create.handle; return(ret); } /* decode one frame */ static int dec_main(unsigned char *istream, unsigned char *ostream, int istream_size, xvid_dec_stats_t *xvid_dec_stats) { int ret; xvid_dec_frame_t xvid_dec_frame; /* Reset all structures */ memset(&xvid_dec_frame, 0, sizeof(xvid_dec_frame_t)); memset(xvid_dec_stats, 0, sizeof(xvid_dec_stats_t)); /* Set version */ xvid_dec_frame.version = XVID_VERSION; xvid_dec_stats->version = XVID_VERSION; /* No general flags to set */ xvid_dec_frame.general = 0; /* Input stream */ xvid_dec_frame.bitstream = istream; xvid_dec_frame.length = istream_size; /* Output frame structure */ xvid_dec_frame.output.plane[0] = ostream; xvid_dec_frame.output.stride[0] = XDIM*BPP; xvid_dec_frame.output.csp = CSP; ret = xvid_decore(dec_handle, XVID_DEC_DECODE, &xvid_dec_frame, xvid_dec_stats); return(ret); } /* close decoder to release resources */ static int dec_stop() { int ret; ret = xvid_decore(dec_handle, XVID_DEC_DESTROY, NULL, NULL); return(ret); }