H264的RTP包如何解包

[冰川人看世界]

各位论坛的大神，请教一下，H264的RTP包如何解包。live555的源码太复杂，没怎么去研究。参考网上其它人的方法，进行解包，把解包后的数据写入到文件中，用Elecard StreamEye工具查看，发现只有I帧是正常的，P帧B帧全部花屏没法看。下面是我解包代码。

bool CRtp::ParseRtpPacket(BYTE *pInBuf, int nSize, BYTE **pOutBuf, int *outSize)
{
		if (nSize < RTP_HEADER_LENGTH)
		{
			return NULL;
		}

		memset(&m_RtpHdr, 0, sizeof(m_RtpHdr));
	
		BYTE *pStart = (BYTE *)&m_RtpHdr;
	
		pStart[0] = pInBuf[0];
		pStart[1] = pInBuf[1];
	
		m_RtpHdr.seq = pInBuf[2];
		m_RtpHdr.seq <<= 8;
		m_RtpHdr.seq |= pInBuf[3];
	
		m_RtpHdr.ts = pInBuf[4];
		m_RtpHdr.ts <<= 8;
		m_RtpHdr.ts |= pInBuf[5];
		m_RtpHdr.ts <<= 8;
		m_RtpHdr.ts |= pInBuf[6];
		m_RtpHdr.ts <<= 8;
		m_RtpHdr.ts |= pInBuf[7];
	
		m_RtpHdr.ssrc = pInBuf[8];
		m_RtpHdr.ssrc <<= 8;
		m_RtpHdr.ssrc |= pInBuf[9];
		m_RtpHdr.ssrc <<= 8;
		m_RtpHdr.ssrc |= pInBuf[10];
		m_RtpHdr.ssrc <<= 8;
		m_RtpHdr.ssrc |= pInBuf[11];

		//检查RTP版本
		if (m_RtpHdr.v != 2)
		{
			return false;
		}

		//检查RTP载荷类型
		if (m_RtpHdr.pt != H264_PAYLOADTYPE)
		{
			return false;
		}

		BYTE *pPayload = pInBuf + RTP_HEADER_LENGTH;
		BYTE nalType = pPayload[0] & 0x1f;
		BYTE *pBuf = NULL;

		if (nalType == 0x1c) //FU-A
		{
			if ((pPayload[1] & 0xe0) == 0x80)
			{
				pBuf = pPayload - 3;
				*((DWORD *)pBuf) = 0x01000000;
				*(pBuf + 4) = (pPayload[0] & 0xe0) | (pPayload[1] & 0x1f);
				*outSize = nSize - RTP_HEADER_LENGTH + 3;
			}
			else
			{
				pBuf = pPayload + 2;
				*outSize = nSize - RTP_HEADER_LENGTH - 2;
			}
		}
		else
		{
			pBuf = pPayload - 4;
			*((DWORD *)pBuf) = 0x01000000;
			*outSize = nSize - RTP_HEADER_LENGTH + 4;
		}

		memcpy(*pOutBuf, pBuf, nSize);

		if (m_RtpHdr.m == 1)
		{
			return true;
		}
		else
		{
			return false;
		}
}

[rightorwrong]

看ffmpeg rtp_enc文件

[lcyw]

#include "stdafx.h"

#include "Rtp2H264.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>



#define MAX_FRAME_SIZE	1024*1024*2// 409600  //2MB

CRtp2H264::CRtp2H264(void)
{
	m_pData = (unsigned char *)malloc(MAX_FRAME_SIZE);
	m_nDataLen = 0;
	m_nNewFrame = 1;
	m_nSeq = -1;
}

CRtp2H264::~CRtp2H264(void)
{
	if( m_pData)
		free( m_pData );
	m_pData = NULL;
}

int CRtp2H264::OnRtpData(unsigned char *pRtpData, int nLen)	
{
	if ((NULL == pRtpData) || (nLen < 12))
		return -1;
	
	_RTP_HEADER *pRtpHeader = (_RTP_HEADER*)pRtpData;

	int nSeq = ntohs( pRtpHeader->nSeq );
	m_nSeq++;
	if ( m_nSeq != nSeq )
	{//
		; 
	}

	m_nSeq = nSeq;
	nLen = nLen - 12;//RtpPayload
	
	unsigned char *pRtpPayload = pRtpData + 12;
	
	if( pRtpHeader->pt < 12)// audio
	{
		memcpy(m_pData, pRtpPayload, nLen);
		m_nNewFrame = 1;
		return 1;
	}
	
	unsigned char nNalType = (unsigned char)pRtpPayload[0] & 0x1f;
	if( nNalType < 24)
	{
		if (0 == m_nNewFrame)
		{// some thing error.	
			; 
		}
		memset(m_pData, 0, 4);
		m_pData[3] = 1;
		memcpy( m_pData+4, pRtpPayload, nLen);
		m_nDataLen = nLen + 4;
		m_nNewFrame = 1;
	}
	else if( nNalType < 28)  //24 <= nNalType <= 27 
	{
		short nSize = 0;
		pRtpPayload++;
		while( nLen > 3)
		{
			memset( m_pData+m_nDataLen, 0, 4);
			m_pData[m_nDataLen+3] = 1;
			memcpy(&nSize, pRtpPayload, 2);

			pRtpPayload++;
			pRtpPayload++;
			// nSize = ntohs (nSize);	// ????
			if(nSize > nLen)
				break;
	 
			m_nDataLen = m_nDataLen + 4;
			memcpy(m_pData+m_nDataLen, pRtpPayload, nSize);
			m_nDataLen = m_nDataLen + nSize;
			pRtpData = pRtpData + nSize;
			nLen = nLen - nSize;
		}
		m_nNewFrame = 1;
	}
	else if((28 == nNalType) || (29 == nNalType))// FU-A
	{
		nNalType = pRtpPayload[0] & 0x60;//0xe0
		nNalType = nNalType | (pRtpPayload[1] & 0x1F);
		if( pRtpPayload[1] &0x80 ) //first pkt
		{ 
		    if (0 == m_nNewFrame)
			{// something error.
				; 
			}
			m_nNewFrame = 0;
			memset(m_pData, 0, 4);
			m_pData[3] = 1;
			m_pData[4] = nNalType;
		
			memcpy(m_pData+5, pRtpPayload+2, nLen-2 ); 
			m_nDataLen = 4 + 1 + nLen - 2;
		}
		else if( pRtpPayload[1] &0x40 )// last pkt
		{ 
			m_nNewFrame = 1;
			if (0 == pRtpHeader->m )
			{// something error.
				; 
			}
			memcpy(m_pData+m_nDataLen, pRtpPayload+2, nLen-2); 
			m_nDataLen = m_nDataLen + nLen - 2;
		}
		else			// middle pkt
		{	
			memcpy(m_pData+m_nDataLen, pRtpPayload+2, nLen-2); 
			m_nDataLen = m_nDataLen + nLen - 2;
		}
	}	
	else
	{
		return -1;
	}
	
	return m_nNewFrame;
}


unsigned char *CRtp2H264::GetH264Data(int *nLen)
{
	*nLen = m_nDataLen;
	if (0 == m_nNewFrame)
		return NULL;

	return m_pData;
}

[yangzcc]

楼主你好，你是不是有破解版的elecard工具啊 能够传我一下 万分感谢了 ~

[冰川人看世界]

放到百度网盘了，自己去下。 http://pan.baidu.com/s/1kTMsJzD