rtmp 發送h264包，主要是sps，pps，i幀和非i幀

28181流媒體，ps流解析，nalu分析，出來的數據封裝成rtmp包發送rtmp，此處僅關心rtmp發送問題

這個連接有完整的調用librtmp發送h264的代碼，但是裏面發送h264包時候有問題，沒有區分包類型
https://blog.csdn.net/godspeed513/article/details/8972947

sps,pps包的構建可以參考這個連接

https://blog.csdn.net/u011003120/article/details/78378632

rtmp包的結構，可以參考這個連接，講的很清楚

https://blog.csdn.net/dqxiaoxiao/article/details/94820599

h264 的nalu分析

https://blog.csdn.net/xiaoluer/article/details/53462894

int SendPacket(unsigned int nPacketType,
							unsigned int size,
							unsigned int nTimestamp)
{
	if(m_pRtmp == NULL)
	{
		return FALSE;
	}

	m_RTMPPacket.m_packetType  = nPacketType;
	//m_RTMPPacket.m_hasAbsTimestamp = 0;
	m_RTMPPacket.m_nChannel    = 0x04;  
	m_RTMPPacket.m_headerType  = RTMP_PACKET_SIZE_LARGE;  
	m_RTMPPacket.m_nTimeStamp  = nTimestamp;  
	m_RTMPPacket.m_nInfoField2 = m_pRtmp->m_stream_id;
	m_RTMPPacket.m_nBodySize   = size;

	int nRet = RTMP_SendPacket(m_pRtmp,&m_RTMPPacket,0);

	return nRet;
}

//過濾sei包，sei，輔助增強信息
if (packet.type == NaluPacket::NALU_SEI)
{
	return;
}
	
//sps，pps一般成對出現
if (packet.type == NaluPacket::NALU_SPS)
{
	//sps, sequenceParameterSetLength
	body[0] = 0x17;
	body[1] = 0x00;//avc packet type, 0,sequeue header, 1, nalu，視頻幀數據爲1，其他爲0
	body[2] = 0x00;//3個字節，composition time,當上個字節包類型爲0時
	body[3] = 0x00;//這3個字節也爲0
	body[4] = 0x00;
	// 如果包類型爲0， 此處是AVCDecoderConfigurationRecord結構
	body[5] = 0x01;//版本號，固定爲1
	body[6] = *(packet.data + 1);//AVCProfileIndication,sps信息裏面去除頭部信息和sps標誌後的第一個字節
										//sps標誌爲0x67
	body[7] = *(packet.data + 2);//profile_compatibility,h264 profile支持級別
	body[8] = *(packet.data + 3);//AVCLevelIndication, level_idc syntax element,默認值21
										//表示支持的最大分辨率和採樣率，21爲HHR,5068.8k samples/second
										//最大值爲51,4096*2304， 251658.24k samples/second
	body[9] = 0xff;	//高6位保留，默認爲'111111', 低2位表示lengthSizeMinusOne
	
	body[10] = 0xe1;	//高3位保留，默認爲'111', 低5位表示numOfSequenceParameterSets，
							//sequeue參數設置的格式，此處爲1,即只有1個sps
	body[11] = (size >> 8) & 0xff;	//sequenceParameterSetLength,2個字節，sps長度
	body[12] = size & 0xff;
	bodyLength = 13;
	memcpy(&body[13], packet.data, size);//sps內容
	bodyLength += size;

	m_setsps = 1;
}
else if (packet.type == NaluPacket::NALU_PPS)
{
	/*pps，PictureParameterSets*/
	body[bodyLength++] = 0x01;//numOfPictureParameterSets，pps個數
	body[bodyLength++] = (size >> 8) & 0xff;//pictureParameterSetLength，pps長度,2個字節
	body[bodyLength++] = (size) & 0xff;
	memcpy(&body[bodyLength], packet.data, size);//pictureParameterSetNaLUUnit,pps內容
	bodyLength += size;
	//如果profile_idc爲100,110,122,144時，需要填充sequenceParameterSetExtLength,即sps擴展
	//sps擴展，nalu 類型爲13

	memcpy(body, body, bodyLength);
	//發送數據包
}

if(packet.type == 5)
{
	body[i++] = 0x17;// 1:Iframe  7:AVC
}
else
{
	body[i++] = 0x27;// 2:Pframe  7:AVC
}

body[i++] = 0x01;// AVC NALU
body[i++] = 0x00;
body[i++] = 0x00;
body[i++] = 0x00;

// NALU size
body[i++] = size>>24;
body[i++] = size>>16;
body[i++] = size>>8;
body[i++] = size&0xff;;

// NALU data
memcpy(&(body[i]),packet.data,size);
//發送數據包