(转)使用FFMpeg进行H264编码 .
使用FFMpeg可以很方便的对音视频进行编码，并且写文件。
下面的代码是将5幅1280*720大小的图片进行编码，并且写到文件中。
代码有些乱，但希望能抛砖引玉，对学习这方面的朋友有帮助。
1 CFile file[5]; 2 BYTE *szTxt[5]; 3 4 int nWidth = 0; 5 int nHeight= 0; 6 7 int nDataLen=0; 8 9 int nLen; 10 11 CString csFileName; 12 for (int fileI = 1; fileI <= 5; fileI ++) 13 { 14 csFileName.Format("e:\\pics\\%d.bmp", fileI); 15 file[fileI - 1].Open(csFileName,CFile::modeRead | CFile::typeBinary); 16 nLen = file[fileI - 1].GetLength(); 17 18 szTxt[fileI -1] = new BYTE[nLen]; 19 file[fileI - 1].Read(szTxt[fileI - 1], nLen); 20 file[fileI - 1].Close(); 21 22 //BMP bmi;//BITMAPINFO bmi; 23 //int nHeadLen = sizeof(BMP); 24 BITMAPFILEHEADER bmpFHeader; 25 BITMAPINFOHEADER bmpIHeader; 26 memcpy(&bmpFHeader,szTxt[fileI -1],sizeof(BITMAPFILEHEADER)); 27 28 int nHeadLen = bmpFHeader.bfOffBits - sizeof(BITMAPFILEHEADER); 29 memcpy(&bmpIHeader,szTxt[fileI - 1]+sizeof(BITMAPFILEHEADER),nHeadLen); 30 31 nWidth = bmpIHeader.biWidth;// 464;// bmi.bmpInfo.bmiHeader.biWidth;// ; 32 nHeight = bmpIHeader.biHeight;//362;// bmi.bmpInfo.bmiHeader.biHeight;// ; 33 34 szTxt[fileI - 1] += bmpFHeader.bfOffBits; 35 nDataLen = nLen-bmpFHeader.bfOffBits; 36 } 37 38 av_register_all(); 39 avcodec_register_all(); 40 AVFrame *m_pRGBFrame = new AVFrame[1]; //RGB帧数据 41 AVFrame *m_pYUVFrame = new AVFrame[1];; //YUV帧数据 42 AVCodecContext *c= NULL; 43 AVCodecContext *in_c= NULL; 44 AVCodec *pCodecH264; //编码器 45 uint8_t * yuv_buff;// 46 47 //查找h264编码器 48 pCodecH264 = avcodec_find_encoder(CODEC_ID_H264); 49 if(!pCodecH264) 50 { 51 fprintf(stderr, "h264 codec not found\n"); 52 exit(1); 53 } 54 55 c= avcodec_alloc_context3(pCodecH264); 56 c->bit_rate = 3000000;// put sample parameters 57 c->width =nWidth;// 58 c->height = nHeight;// 59 60 // frames per second 61 AVRational rate; 62 rate.num = 1; 63 rate.den = 25; 64 c->time_base= rate;//(AVRational){1,25}; 65 c->gop_size = 10; // emit one intra frame every ten frames 66 c->max_b_frames=1; 67 c->thread_count = 1; 68 c->pix_fmt = PIX_FMT_YUV420P;//PIX_FMT_RGB24; 69 70 //av_opt_set(c->priv_data, /*"preset"*/"libvpx-1080p.ffpreset", /*"slow"*/NULL, 0); 71 //打开编码器 72 if(avcodec_open2(c,pCodecH264,NULL)<0) 73 TRACE("不能打开编码库"); 74 75 int size = c->width * c->height; 76 77 yuv_buff = (uint8_t *) malloc((size * 3) / 2); // size for YUV 420 78 79 //将rgb图像数据填充rgb帧 80 uint8_t * rgb_buff = new uint8_t[nDataLen]; 81 82 //图象编码 83 int outbuf_size=100000; 84 uint8_t * outbuf= (uint8_t*)malloc(outbuf_size); 85 int u_size = 0; 86 FILE *f=NULL; 87 char * filename = "e:\\pics\\myData.h264"; 88 f = fopen(filename, "wb"); 89 if (!f) 90 { 91 TRACE( "could not open %s\n", filename); 92 exit(1); 93 } 94 95 //初始化SwsContext 96 SwsContext * scxt = sws_getContext(c->width,c->height,PIX_FMT_BGR24,c->width,c->height,PIX_FMT_YUV420P,SWS_POINT,NULL,NULL,NULL); 97 98 AVPacket avpkt; 99 100 //AVFrame *pTFrame=new AVFrame 101 for (int i=0;i<250;++i) 102 { 103 104 //AVFrame *m_pYUVFrame = new AVFrame[1]; 105 106 int index = (i / 25) % 5; 107 memcpy(rgb_buff,szTxt[index],nDataLen); 108 109 avpicture_fill((AVPicture*)m_pRGBFrame, (uint8_t*)rgb_buff, PIX_FMT_RGB24, nWidth, nHeight); 110 111 //将YUV buffer 填充YUV Frame 112 avpicture_fill((AVPicture*)m_pYUVFrame, (uint8_t*)yuv_buff, PIX_FMT_YUV420P, nWidth, nHeight); 113 114 // 翻转RGB图像 115 m_pRGBFrame->data[0] += m_pRGBFrame->linesize[0] * (nHeight - 1); 116 m_pRGBFrame->linesize[0] *= -1; 117 m_pRGBFrame->data[1] += m_pRGBFrame->linesize[1] * (nHeight / 2 - 1); 118 m_pRGBFrame->linesize[1] *= -1; 119 m_pRGBFrame->data[2] += m_pRGBFrame->linesize[2] * (nHeight / 2 - 1); 120 m_pRGBFrame->linesize[2] *= -1; 121 122 123 //将RGB转化为YUV 124 sws_scale(scxt,m_pRGBFrame->data,m_pRGBFrame->linesize,0,c->height,m_pYUVFrame->data,m_pYUVFrame->linesize); 125 126 int got_packet_ptr = 0; 127 av_init_packet(&avpkt); 128 avpkt.data = outbuf; 129 avpkt.size = outbuf_size; 130 u_size = avcodec_encode_video2(c, &avpkt, m_pYUVFrame, &got_packet_ptr); 131 if (u_size == 0) 132 { 133 fwrite(avpkt.data, 1, avpkt.size, f); 134 } 135 } 136 137 fclose(f); 138 delete []m_pRGBFrame; 139 delete []m_pYUVFrame; 140 delete []rgb_buff; 141 free(outbuf); 142 avcodec_close(c); 143 av_free(c);
