求解ffmpeg 解码通过rtp接受的h264数据出现花屏/马赛克

zjx88ba 2014-07-10 08:06:04

求解ffmpeg 解码通过rtp接受的h264数据出现花屏/马赛克

求高手帮忙解答，下面列出rtp接受和解码关键代码：



while ((pack = GetNextPacket()) != NULL)  

              {  

				  if((int)pack->GetPayloadType() == 2)

				  {

					  	if(pack->HasMarker())//如果是最后一包 ;

						{



							if (m_current_size == 0)

							{

								CRTPSessionUtils::DecodeOneFrame(pack->GetPayloadData(),(int)pack->GetPayloadLength());

							}else{

								CRTPSessionUtils::DecodeOneFrame(m_buffer,m_current_size);//解码一帧数据;	   



							}

							m_current_size = 0;

						}

						else{

							memcpy(m_buffer + m_current_size,pack->GetPayloadData(),pack->GetPayloadLength());  

							m_current_size += pack->GetPayloadLength(); 

							

						}

						

				  }

				

				  DeletePacket(pack);  

              }

解码部分：



void CRTPSessionUtils::DecodeOneFrame(uint8_t *pBuffer,int dwBufsize)

	{



		CRTPSessionUtils::packet.data = pBuffer;

		CRTPSessionUtils::packet.size = dwBufsize;

		avcodec_decode_video2(CRTPSessionUtils::pCodecCtx,CRTPSessionUtils::pFrame,&(CRTPSessionUtils::frameFinished),&(CRTPSessionUtils::packet));//对packet中的帧进行解码

		if (CRTPSessionUtils::frameFinished)

		{



			int newSize = 152064;



			unsigned char *buf = new unsigned char[newSize];  

			buffer_current_frame= new uint8_t[newSize];



			int height = CRTPSessionUtils::pCodecCtx->height;  

			int width = CRTPSessionUtils::pCodecCtx->width;  



		   int a=0,i;   

			for (i=0; i<height; i++)   

			{   

				memcpy(buf+a,CRTPSessionUtils::pFrame->data[0] + i * CRTPSessionUtils::pFrame->linesize[0], width);   

				a+=width;   

			}   

			for (i=0; i<height/2; i++)   

			{   

				memcpy(buf+a,CRTPSessionUtils::pFrame->data[1] + i * CRTPSessionUtils::pFrame->linesize[1], width/2);   

				a+=width/2;   

			}   

			for (i=0; i<height/2; i++)   

			{   

				memcpy(buf+a,CRTPSessionUtils::pFrame->data[2] + i * CRTPSessionUtils::pFrame->linesize[2], width/2);   

				a+=width/2;   

			}  



			 memcpy(buffer_current_frame,buf,newSize); 

			 bufferIsNull = true;



		    delete [] buf; 



		}

	

	}