实例介绍
【实例简介】
【实例截图】
【实例截图】
【核心代码】
#include <stdio.h> #define __STDC_CONSTANT_MACROS #ifdef _WIN32 //Windows extern "C" { #include "libavcodec/avcodec.h" #include "libavformat/avformat.h" #include "libswscale/swscale.h" #include "libavutil/imgutils.h" #include "SDL2/SDL.h" }; #else //Linux... #ifdef __cplusplus extern "C" { #endif #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libswscale/swscale.h> #include <SDL2/SDL.h> #include <libavutil/imgutils.h> #ifdef __cplusplus }; #endif #endif //Output YUV420P data as a file #define OUTPUT_YUV420P 0 int main(int argc, char* argv[]) { AVFormatContext *pFormatCtx; int i, videoindex; AVCodecContext *pCodecCtx; AVCodec *pCodec; AVFrame *pFrame,*pFrameYUV; unsigned char *out_buffer; AVPacket *packet; int ret, got_picture; struct SwsContext *img_convert_ctx; char filepath[]="/Users/emir/Desktop/test.mp4"; //SDL--------------------------- int screen_w=0,screen_h=0; SDL_Window *screen; SDL_Renderer* sdlRenderer; SDL_Texture* sdlTexture; SDL_Rect sdlRect; avformat_network_init(); pFormatCtx = avformat_alloc_context(); if(avformat_open_input(&pFormatCtx,filepath,NULL,NULL)!=0){ printf("Couldn't open input stream.\n"); return -1; } if(avformat_find_stream_info(pFormatCtx,NULL)<0){ printf("Couldn't find stream information.\n"); return -1; } videoindex=-1; for(i=0; i<pFormatCtx->nb_streams; i ) if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){ videoindex=i; break; } if(videoindex==-1){ printf("Didn't find a video stream.\n"); return -1; } pCodecCtx=pFormatCtx->streams[videoindex]->codec; pCodec=avcodec_find_decoder(pCodecCtx->codec_id); if(pCodec==NULL){ printf("Codec not found.\n"); return -1; } if(avcodec_open2(pCodecCtx, pCodec,NULL)<0){ printf("Could not open codec.\n"); return -1; } pFrame=av_frame_alloc(); pFrameYUV=av_frame_alloc(); out_buffer=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,1)); av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize,out_buffer, AV_PIX_FMT_YUV420P,pCodecCtx->width, pCodecCtx->height,1); packet=(AVPacket *)av_malloc(sizeof(AVPacket)); //Output Info----------------------------- printf("--------------- File Information ----------------\n"); av_dump_format(pFormatCtx,0,filepath,0); printf("-------------------------------------------------\n"); img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); #if OUTPUT_YUV420P fp_yuv=fopen("output.yuv","wb "); #endif if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) { printf( "Could not initialize SDL - %s\n", SDL_GetError()); return -1; } screen_w = pCodecCtx->width; screen_h = pCodecCtx->height; //SDL 2.0 Support for multiple windows screen = SDL_CreateWindow("Simplest ffmpeg player's Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, screen_w, screen_h, SDL_WINDOW_OPENGL); if(!screen) { printf("SDL: could not create window - exiting:%s\n",SDL_GetError()); return -1; } sdlRenderer = SDL_CreateRenderer(screen, -1, 0); //IYUV: Y U V (3 planes) //YV12: Y V U (3 planes) sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING,pCodecCtx->width,pCodecCtx->height); sdlRect.x=0; sdlRect.y=0; sdlRect.w=screen_w; sdlRect.h=screen_h; //SDL End---------------------- while(av_read_frame(pFormatCtx, packet)>=0){ if(packet->stream_index==videoindex){ // ret = ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet); if(ret < 0){ printf("Decode Error.\n"); return -1; } if(got_picture){ sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize); #if OUTPUT_YUV420P y_size=pCodecCtx->width*pCodecCtx->height; fwrite(pFrameYUV->data[0],1,y_size,fp_yuv); //Y fwrite(pFrameYUV->data[1],1,y_size/4,fp_yuv); //U fwrite(pFrameYUV->data[2],1,y_size/4,fp_yuv); //V #endif //SDL--------------------------- #if 0 SDL_UpdateTexture( sdlTexture, NULL, pFrameYUV->data[0], pFrameYUV->linesize[0] ); #else SDL_UpdateYUVTexture(sdlTexture, &sdlRect, pFrameYUV->data[0], pFrameYUV->linesize[0], pFrameYUV->data[1], pFrameYUV->linesize[1], pFrameYUV->data[2], pFrameYUV->linesize[2]); #endif SDL_RenderClear( sdlRenderer ); SDL_RenderCopy( sdlRenderer, sdlTexture, NULL, &sdlRect); SDL_RenderPresent( sdlRenderer ); //SDL End----------------------- //Delay 40ms SDL_Delay(40); } } av_free_packet(packet); } //flush decoder //FIX: Flush Frames remained in Codec while (1) { ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet); if (ret < 0) break; if (!got_picture) break; sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize); #if OUTPUT_YUV420P int y_size=pCodecCtx->width*pCodecCtx->height; fwrite(pFrameYUV->data[0],1,y_size,fp_yuv); //Y fwrite(pFrameYUV->data[1],1,y_size/4,fp_yuv); //U fwrite(pFrameYUV->data[2],1,y_size/4,fp_yuv); //V #endif //SDL--------------------------- SDL_UpdateTexture( sdlTexture, &sdlRect, pFrameYUV->data[0], pFrameYUV->linesize[0] ); SDL_RenderClear( sdlRenderer ); SDL_RenderCopy( sdlRenderer, sdlTexture, NULL, &sdlRect); SDL_RenderPresent( sdlRenderer ); //SDL End----------------------- //Delay 40ms SDL_Delay(40); } sws_freeContext(img_convert_ctx); #if OUTPUT_YUV420P fclose(fp_yuv); #endif SDL_Quit(); av_frame_free(&pFrameYUV); av_frame_free(&pFrame); avcodec_close(pCodecCtx); avformat_close_input(&pFormatCtx); return 0; }
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