librtmp_send264.cpp

/**
 * Simplest Librtmp Send 264
 *
 * 雷霄骅，张晖
 * leixiaohua1020@126.com
 * zhanghuicuc@gmail.com
 * 中国传媒大学/数字电视技术
 * Communication University of China / Digital TV Technology
 * http://blog.csdn.net/leixiaohua1020
 *
 * 本程序用于将内存中的H.264数据推送至RTMP流媒体服务器。
 *
 */

#include "stdafx.h"

#include <stdio.h>
#include <stdlib.h>
 
#include "librtmp_send264.h"

#ifdef WIN32     
#include <windows.h>  
#pragma comment(lib,"WS2_32.lib")   
#pragma comment(lib,"winmm.lib")  
#endif 

//定义包头长度，RTMP_MAX_HEADER_SIZE=18
#define RTMP_HEAD_SIZE   (sizeof(RTMPPacket)+RTMP_MAX_HEADER_SIZE)
//存储Nal单元数据的buffer大小
#define BUFFER_SIZE 32768
//搜寻Nal单元时的一些标志
#define GOT_A_NAL_CROSS_BUFFER BUFFER_SIZE+1
#define GOT_A_NAL_INCLUDE_A_BUFFER BUFFER_SIZE+2
#define NO_MORE_BUFFER_TO_READ BUFFER_SIZE+3


/**
 * 初始化winsock
 *					
 * @成功则返回1 , 失败则返回相应错误代码
 */ 
int InitSockets()    
{    
	#ifdef WIN32     
		WORD version;    
		WSADATA wsaData;    
		version = MAKEWORD(1, 1);    
		return (WSAStartup(version, &wsaData) == 0);    
	#else     
		return TRUE;    
	#endif     
}

/**
 * 释放winsock
 *					
 * @成功则返回0 , 失败则返回相应错误代码
 */ 
inline void CleanupSockets()    
{    
	#ifdef WIN32     
		WSACleanup();    
	#endif     
}    

//网络字节序转换
char * put_byte( char *output, uint8_t nVal )    
{    
	output[0] = nVal;    
	return output+1;    
}   

char * put_be16(char *output, uint16_t nVal )    
{    
	output[1] = nVal & 0xff;    
	output[0] = nVal >> 8;    
	return output+2;    
}  

char * put_be24(char *output,uint32_t nVal )    
{    
	output[2] = nVal & 0xff;    
	output[1] = nVal >> 8;    
	output[0] = nVal >> 16;    
	return output+3;    
}    
char * put_be32(char *output, uint32_t nVal )    
{    
	output[3] = nVal & 0xff;    
	output[2] = nVal >> 8;    
	output[1] = nVal >> 16;    
	output[0] = nVal >> 24;    
	return output+4;    
}    
char *  put_be64( char *output, uint64_t nVal )    
{    
	output=put_be32( output, nVal >> 32 );    
	output=put_be32( output, nVal );    
	return output;    
}  

char * put_amf_string( char *c, const char *str )    
{    
	uint16_t len = strlen( str );    
	c=put_be16( c, len );    
	memcpy(c,str,len);    
	return c+len;    
}    
char * put_amf_double( char *c, double d )    
{    
	*c++ = AMF_NUMBER;  /* type: Number */    
	{    
		unsigned char *ci, *co;    
		ci = (unsigned char *)&d;    
		co = (unsigned char *)c;    
		co[0] = ci[7];    
		co[1] = ci[6];    
		co[2] = ci[5];    
		co[3] = ci[4];    
		co[4] = ci[3];    
		co[5] = ci[2];    
		co[6] = ci[1];    
		co[7] = ci[0];    
	}    
	return c+8;    
}  


RTMP* m_pRtmp;  
RTMPMetadata metaData;


/**
 * 初始化并连接到服务器
 *
 * @param url 服务器上对应webapp的地址
 *					
 * @成功则返回1 , 失败则返回0
 */ 
int RTMP264_Connect(const char* url, RTMP** ppRtmp)
{  
	InitSockets();  

	m_pRtmp = RTMP_Alloc();
	RTMP_Init(m_pRtmp);
	/*设置URL*/
	if (RTMP_SetupURL(m_pRtmp,(char*)url) == FALSE)
	{
		RTMP_Free(m_pRtmp);
		return false;
	}
	/*设置可写,即发布流,这个函数必须在连接前使用,否则无效*/
	RTMP_EnableWrite(m_pRtmp);
	/*连接服务器*/
	if (RTMP_Connect(m_pRtmp, NULL) == FALSE) 
	{
		RTMP_Free(m_pRtmp);
		return -2;
	} 

	/*连接流*/
	if (RTMP_ConnectStream(m_pRtmp,0) == FALSE)
	{
		RTMP_Close(m_pRtmp);
		RTMP_Free(m_pRtmp);
		return -3;
	}
	*ppRtmp = m_pRtmp;
	return true;  
}  


/**
 * 断开连接，释放相关的资源。
 *
 */    
void RTMP264_Close()  
{  
	if(m_pRtmp)  
	{  
		RTMP_Close(m_pRtmp);  
		RTMP_Free(m_pRtmp);  
		m_pRtmp = NULL;  
	}  
	CleanupSockets();   
} 

void InitSpsPps(unsigned char *pps, int pps_len, unsigned char * sps, int sps_len, int width, int height, int fps)
{
	memset(&metaData, 0, sizeof(RTMPMetadata));
	metaData.nWidth = width;
	metaData.nHeight = height;
	metaData.nFrameRate = fps;
	metaData.nSpsLen = sps_len;
	metaData.Sps = sps;
	metaData.nPpsLen = pps_len;
	metaData.Pps = pps;
}

/**
 * 发送RTMP数据包
 *
 * @param nPacketType 数据类型
 * @param data 存储数据内容
 * @param size 数据大小
 * @param nTimestamp 当前包的时间戳
 *
 * @成功则返回 1 , 失败则返回一个小于0的数
 */
int SendPacket(unsigned int nPacketType,unsigned char *data,unsigned int size,unsigned int nTimestamp)  
{  
	RTMPPacket* packet;
	/*分配包内存和初始化,len为包体长度*/
	packet = (RTMPPacket *)malloc(RTMP_HEAD_SIZE+size);
	memset(packet,0,RTMP_HEAD_SIZE);
	/*包体内存*/
	packet->m_body = (char *)packet + RTMP_HEAD_SIZE;
	packet->m_nBodySize = size;
	memcpy(packet->m_body,data,size);
	packet->m_hasAbsTimestamp = 0;
	packet->m_packetType = nPacketType; /*此处为类型有两种一种是音频,一种是视频*/
	packet->m_nInfoField2 = m_pRtmp->m_stream_id;
	packet->m_nChannel = 0x04;

	packet->m_headerType = RTMP_PACKET_SIZE_LARGE;
	if (RTMP_PACKET_TYPE_AUDIO ==nPacketType && size !=4)
	{
		packet->m_headerType = RTMP_PACKET_SIZE_MEDIUM;
	}
	packet->m_nTimeStamp = nTimestamp;
	/*发送*/
	int nRet =0;
	if (RTMP_IsConnected(m_pRtmp))
	{
		nRet = RTMP_SendPacket(m_pRtmp,packet,TRUE); /*TRUE为放进发送队列,FALSE是不放进发送队列,直接发送*/
	}
	/*释放内存*/
	free(packet);
	return nRet;  
}  

/**
 * 发送视频的sps和pps信息
 *
 * @param pps 存储视频的pps信息
 * @param pps_len 视频的pps信息长度
 * @param sps 存储视频的pps信息
 * @param sps_len 视频的sps信息长度
 *
 * @成功则返回 1 , 失败则返回0
 */
int SendVideoSpsPps(unsigned char *pps,int pps_len,unsigned char * sps,int sps_len)
{

	RTMPPacket * packet=NULL;//rtmp包结构
	unsigned char * body=NULL;
	int i;
	packet = (RTMPPacket *)malloc(RTMP_HEAD_SIZE+1024);
	//RTMPPacket_Reset(packet);//重置packet状态
	memset(packet,0,RTMP_HEAD_SIZE+1024);
	packet->m_body = (char *)packet + RTMP_HEAD_SIZE;
	body = (unsigned char *)packet->m_body;
	i = 0;
	body[i++] = 0x17;
	body[i++] = 0x00;

	body[i++] = 0x00;
	body[i++] = 0x00;
	body[i++] = 0x00;

	/*AVCDecoderConfigurationRecord*/
	body[i++] = 0x01;
	body[i++] = sps[1];
	body[i++] = sps[2];
	body[i++] = sps[3];
	body[i++] = 0xff;

	/*sps*/
	body[i++]   = 0xe1;
	body[i++] = (sps_len >> 8) & 0xff;
	body[i++] = sps_len & 0xff;
	memcpy(&body[i],sps,sps_len);
	i +=  sps_len;

	/*pps*/
	body[i++]   = 0x01;
	body[i++] = (pps_len >> 8) & 0xff;
	body[i++] = (pps_len) & 0xff;
	memcpy(&body[i],pps,pps_len);
	i +=  pps_len;

	packet->m_packetType = RTMP_PACKET_TYPE_VIDEO;
	packet->m_nBodySize = i;
	packet->m_nChannel = 0x04;
	packet->m_nTimeStamp = 0;
	packet->m_hasAbsTimestamp = 0;
	packet->m_headerType = RTMP_PACKET_SIZE_MEDIUM;
	packet->m_nInfoField2 = m_pRtmp->m_stream_id;

	/*调用发送接口*/
	int nRet = RTMP_SendPacket(m_pRtmp,packet,TRUE);
	free(packet);    //释放内存
	return nRet;
}

/**
 * 发送H264数据帧
 *
 * @param data 存储数据帧内容
 * @param size 数据帧的大小
 * @param bIsKeyFrame 记录该帧是否为关键帧
 * @param nTimeStamp 当前帧的时间戳
 *
 * @成功则返回 1 , 失败则返回0
 */
int SendH264Packet(unsigned char *data,unsigned int size,int bIsKeyFrame,unsigned int nTimeStamp)  
{  
	if(data == NULL && size<11){  
		return false;  
	}  

	unsigned char *body = (unsigned char*)malloc(size+9);  
	memset(body,0,size+9);

	int i = 0; 
	if(bIsKeyFrame){  
		body[i++] = 0x17;// 1:Iframe  7:AVC   
		body[i++] = 0x01;// AVC NALU   
		body[i++] = 0x00;  
		body[i++] = 0x00;  
		body[i++] = 0x00;  


		// NALU size   
		body[i++] = size>>24 &0xff;  
		body[i++] = size>>16 &0xff;  
		body[i++] = size>>8 &0xff;  
		body[i++] = size&0xff;
		// NALU data   
		memcpy(&body[i],data,size);  
		SendVideoSpsPps(metaData.Pps,metaData.nPpsLen,metaData.Sps,metaData.nSpsLen);
	}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 &0xff;  
		body[i++] = size>>16 &0xff;  
		body[i++] = size>>8 &0xff;  
		body[i++] = size&0xff;
		// NALU data   
		memcpy(&body[i],data,size);  
	}  
	

	int bRet = SendPacket(RTMP_PACKET_TYPE_VIDEO,body,i+size,nTimeStamp);  

	free(body);  

	return bRet;  
}