Create (转)FFMpeg写MP4文件例子分析.c

(转)FFMpeg写MP4文件例子分析.c

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+/**
+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。
+*/
+
+CFile file[5];
+BYTE *szTxt[5];
+
+int nWidth = 0;
+int nHeight= 0;
+
+int nDataLen=0;
+
+int nLen;
+
+CString csFileName;
+for (int fileI = 1; fileI <= 5; fileI ++)
+{
+  csFileName.Format("e:\\pics\\%d.bmp", fileI);
+  file[fileI - 1].Open(csFileName,CFile::modeRead | CFile::typeBinary);
+  nLen = file[fileI - 1].GetLength();
+
+  szTxt[fileI -1] = new BYTE[nLen];
+  file[fileI - 1].Read(szTxt[fileI - 1], nLen);
+  file[fileI - 1].Close();
+
+  //BMP bmi;//BITMAPINFO bmi;
+  //int nHeadLen = sizeof(BMP);
+  BITMAPFILEHEADER bmpFHeader;
+  BITMAPINFOHEADER bmpIHeader;
+  memcpy(&bmpFHeader,szTxt[fileI -1],sizeof(BITMAPFILEHEADER));
+
+  int nHeadLen = bmpFHeader.bfOffBits - sizeof(BITMAPFILEHEADER);
+  memcpy(&bmpIHeader,szTxt[fileI - 1]+sizeof(BITMAPFILEHEADER),nHeadLen);
+
+nWidth = bmpIHeader.biWidth;// 464;// bmi.bmpInfo.bmiHeader.biWidth;// ;
+  nHeight = bmpIHeader.biHeight;//362;// bmi.bmpInfo.bmiHeader.biHeight;// ;
+
+  szTxt[fileI - 1] += bmpFHeader.bfOffBits;
+  nDataLen = nLen-bmpFHeader.bfOffBits;
+}
+
+av_register_all();
+avcodec_register_all();
+AVFrame *m_pRGBFrame =  new AVFrame[1];  //RGB帧数据
+AVFrame *m_pYUVFrame = new AVFrame[1];;  //YUV帧数据
+AVCodecContext *c= NULL;
+AVCodecContext *in_c= NULL;
+AVCodec *pCodecH264; //编码器
+uint8_t * yuv_buff;//
+
+//查找h264编码器
+pCodecH264 = avcodec_find_encoder(CODEC_ID_H264);
+if(!pCodecH264)
+{
+  fprintf(stderr, "h264 codec not found\n");
+  exit(1);
+}
+
+c= avcodec_alloc_context3(pCodecH264);
+c->bit_rate = 3000000;// put sample parameters
+c->width =nWidth;//
+c->height = nHeight;//
+
+// frames per second
+AVRational rate;
+rate.num = 1;
+rate.den = 25;
+c->time_base= rate;//(AVRational){1,25};
+c->gop_size = 10; // emit one intra frame every ten frames
+c->max_b_frames=1;
+c->thread_count = 1;
+c->pix_fmt = PIX_FMT_YUV420P;//PIX_FMT_RGB24;
+
+//av_opt_set(c->priv_data, /*"preset"*/"libvpx-1080p.ffpreset", /*"slow"*/NULL, 0);
+//打开编码器
+if(avcodec_open2(c,pCodecH264,NULL)<0)
+  TRACE("不能打开编码库");
+
+int size = c->width * c->height;
+
+yuv_buff = (uint8_t *) malloc((size * 3) / 2); // size for YUV 420
+
+//将rgb图像数据填充rgb帧
+uint8_t * rgb_buff = new uint8_t[nDataLen];
+
+//图象编码
+int outbuf_size=100000;
+uint8_t * outbuf= (uint8_t*)malloc(outbuf_size);
+int u_size = 0;
+FILE *f=NULL;
+char * filename = "e:\\pics\\myData.h264";
+f = fopen(filename, "wb");
+if (!f)
+{
+  TRACE( "could not open %s\n", filename);
+  exit(1);
+}
+
+//初始化SwsContext
+SwsContext * scxt = sws_getContext(c->width,c->height,PIX_FMT_BGR24,c->width,c->height,PIX_FMT_YUV420P,SWS_POINT,NULL,NULL,NULL);
+
+AVPacket avpkt;
+
+//AVFrame *pTFrame=new AVFrame
+for (int i=0;i<250;++i)
+{
+
+  //AVFrame *m_pYUVFrame = new AVFrame[1];
+
+  int index = (i / 25) % 5;
+  memcpy(rgb_buff,szTxt[index],nDataLen);
+
+  avpicture_fill((AVPicture*)m_pRGBFrame, (uint8_t*)rgb_buff, PIX_FMT_RGB24, nWidth, nHeight);
+
+  //将YUV buffer 填充YUV Frame
+  avpicture_fill((AVPicture*)m_pYUVFrame, (uint8_t*)yuv_buff, PIX_FMT_YUV420P, nWidth, nHeight);
+
+  // 翻转RGB图像
+  m_pRGBFrame->data[0]  += m_pRGBFrame->linesize[0] * (nHeight - 1);
+  m_pRGBFrame->linesize[0] *= -1;
+  m_pRGBFrame->data[1]  += m_pRGBFrame->linesize[1] * (nHeight / 2 - 1);
+  m_pRGBFrame->linesize[1] *= -1;
+  m_pRGBFrame->data[2]  += m_pRGBFrame->linesize[2] * (nHeight / 2 - 1);
+  m_pRGBFrame->linesize[2] *= -1;
+
+
+  //将RGB转化为YUV
+  sws_scale(scxt,m_pRGBFrame->data,m_pRGBFrame->linesize,0,c->height,m_pYUVFrame->data,m_pYUVFrame->linesize);
+
+  int got_packet_ptr = 0;
+  av_init_packet(&avpkt);
+  avpkt.data = outbuf;
+  avpkt.size = outbuf_size;
+  u_size = avcodec_encode_video2(c, &avpkt, m_pYUVFrame, &got_packet_ptr);
+  if (u_size == 0)
+  {
+   fwrite(avpkt.data, 1, avpkt.size, f);
+  }
+}
+
+fclose(f);
+delete []m_pRGBFrame;
+delete []m_pYUVFrame;
+delete []rgb_buff;
+free(outbuf);
+avcodec_close(c);
+av_free(c);