Decode()
??? {
??? FILE * inpf;
??? ?
??? int nWrite;
??? int i,p;
??? int nalLen;
??? unsigned char* Buf;
??? int got_picture, consumed_bytes;
??? unsigned char *DisplayBuf;
??? DisplayBuf=(unsigned char *)malloc(60000);
??? ?
??? char outfile[] = "test.pgm";
??? ?
??? //1.打開輸入文件
??? inpf = fopen("test.264", "rb");
??? ?
??? //outf = fopen("out.yuv", "wb");
??? ?
??? if(!inpf)
??? {
??? goto Decodereturn;
??? }
??? ?
??? nalLen = 0;
??? Buf = (unsigned char*)calloc ( 1000000, sizeof(char)); //準備解碼文件緩沖
??? ?
??? //2.注冊解碼器，并且找到H264解碼器
??? avcodec_init();
??? avcodec_register_all();
??? codec = avcodec_find_decoder(CODEC_ID_H264);
??? ?
??? if (!codec) {
??? return 0;
??? }
??? //allocate codec context
??? //分配解碼器內存
??? c = avcodec_alloc_context();
??? ?
??? if(!c){
??? return 0;
??? }
??? //open codec
??? //3.打開解碼器
??? if (avcodec_open(c, codec) < 0) {
??? return 0;
??? }
??? ?
??? //allocate frame buffer
??? //分配解碼器用的幀緩沖
??? picture = avcodec_alloc_frame();
??? if(!picture){
??? return 0;
??? }
??? ?
??? rgbdatanew = (unsigned char *)malloc(sizeof(unsigned char)*(3 * width * height));
??? ?
??? while(!feof(inpf))
??? {
??? ?
??? //4.獲取下一個NAL的長度,并且將NAL放入Buf
??? nalLen = getNextNal(inpf, Buf);
??? ?
??? //5.對改NAL解碼，解碼的YUV數據存在picture中
??? consumed_bytes= avcodec_decode_video(c, picture, &got_picture, Buf, nalLen);
??? ?
??? if(consumed_bytes > 0)
??? {
??? ?
??? //6.將picture中的YUV數據顯示或者保存到文件
??? p=0;
??? for(i=0; i<c->height; i++)
??? {
??? memcpy(DisplayBuf+p,picture->data[0] + i * picture->linesize[0], c->width);
??? p+=c->width;
??? }
??? for(i=0; i<c->height/2; i++)
??? {
??? memcpy(DisplayBuf+p,picture->data[1] + i * picture->linesize[1], c->width/2);
??? p+=c->width/2;
??? }
??? for(i=0; i<c->height/2; i++)
??? {
??? memcpy(DisplayBuf+p,picture->data[2] + i * picture->linesize[2], c->width/2);
??? p+=c->width/2;
??? }
??? //顯示畫面
??? DisplayVideo(DisplayBuf);
??? }
??? }
??? ?
??? //7.關閉輸入文件
??? if(inpf)
??? fclose(inpf);
??? ?
??? Decodereturn:
??? ?
??? //8.關閉解碼器,釋放解碼器內存
??? if(c) {
??? avcodec_close(c);
??? av_free(c);
??? c = NULL;
??? }
??? //9.釋放解碼畫面內存
??? if(picture) {
??? av_free(picture);
??? picture = NULL;
??? }
??? ?
??? //10.釋放解碼文件緩沖
??? if(Buf)
??? {
??? free(Buf);
??? Buf = NULL;
??? }
??? ?
??? free(DisplayBuf);
??? }

總結

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