标签:协议 packet packetBody nal 实现 iter len ++ Rtmp
Rtmp协议看一篇就够了_fdsafwagdagadg6576的专栏-CSDN博客
rtmp 封装h264需要应用层处理, librtmp仅仅负责connect&send
本例实现rtp 流转成rtmp流
rtmp 协议封包
Rtmp协议看一篇就够了_fdsafwagdagadg6576的专栏-CSDN博客
实现代码
audio
video
videoheader:
//videoTagHeader
packetBody[iter++] = 0x17; // 1:keyframe 7:AVC
packetBody[iter++] = 0x00; // AVC sequence header
packetBody[iter++] = 0x00;
packetBody[iter++] = 0x00;
packetBody[iter++] = 0x00; // fill in 0;
packetBody[iter++] = 0x01;
unsigned int nal_len = 0 ;
unsigned char * buf_offset = m_videoHeader->m_SPS->m_pData;
unsigned char * buf = buf_offset ;
int total = m_videoHeader->m_SPS->m_iLen ;
unsigned char *nal = NULL ;
//videoTagBody
nal = get_nal1( &nal_len, &buf_offset, buf, total, p->static_inaluHeaderLen ) ;
{
VideoCtlData * pItem = m_videoHeader->m_SPS ;
if ( pItem->m_iLen >= 4 )
{
packetBody[iter++] = nal[1] ;
packetBody[iter++] = nal[2] ;
packetBody[iter++] = nal[3] ;
}
}
packetBody[iter++] = 0xFF ;
packetBody[iter++] = 0xE0 | ( 0x1F & m_videoHeader->m_iSPSNumber ) ;
if ( m_videoHeader->m_SPS != NULL )
{
packetBody[iter++] = nal_len >> 8 ;
packetBody[iter++] = nal_len & 0xFF ;
memcpy( &packetBody[iter], nal, nal_len ) ;
iter += nal_len ;
}
packetBody[iter++] = m_videoHeader->m_iPPSNumber ; //PPS Header
if ( m_videoHeader->m_PPS != NULL )
{
packetBody[iter++] = ( m_videoHeader->m_PPS->m_iLen - p->static_inaluHeaderLen ) >> 8 ;
packetBody[iter++] = ( m_videoHeader->m_PPS->m_iLen - p->static_inaluHeaderLen ) & 0xFF ;
memcpy( &packetBody[iter], m_videoHeader->m_PPS->m_pData + p->static_inaluHeaderLen, m_videoHeader->m_PPS->m_iLen - p->static_inaluHeaderLen ) ;
iter += m_videoHeader->m_PPS->m_iLen - p->static_inaluHeaderLen ;
}
videodata
int _send_video_data_toserver( janus_videoroom_participant *p, PushItemData *videoItem )
{
int ibegain = ( DATA_HEADER_SIZE - 5 ) ; //0x00000001+type is 5 byte
//tag data第一个字节0x17固定
unsigned char *packetBody = videoItem->m_dataPtr + ibegain;
int iter = 0 ;
if ( videoItem->m_bKeyFrame )
{
packetBody[iter++] = 0x17;
}
else
{
packetBody[iter++] = 0x27 ;
}
.....
AssembleNaluData( p, videoItem->m_dataPtr + DATA_HEADER_SIZE, videoItem->m_dwSize ) ;
iRet = _send_Rtmp_packet(...);
}
//VideoTagBody
gboolean AssembleNaluData( janus_videoroom_participant *p, unsigned char *pNaluData, int iLen )
{
while( ( nal = get_nal1( &nal_len, &buf_offset, buf, total, p->static_inaluHeaderLen ) ) != NULL ) {
offset = write_nal_len;
//nal len +nal data
pNaluData[offset++] = ( uint8_t )( ( nal_len >> 24 ) & 0x7f ); //nal length
pNaluData[offset++] = ( uint8_t )( ( nal_len >> 16 ) & 0xff ); //nal length
pNaluData[offset++] = ( uint8_t )( ( nal_len >> 8 ) & 0xff ); //nal length
pNaluData[offset++] = ( uint8_t )( nal_len & 0xff ); //nal length
write_nal_len += nal_len + p->static_inaluHeaderLen ;
}
}
发送
//调用librtmp发送
int _send_Rtmp_packet( janus_videoroom_participant *p, unsigned int packetType, unsigned char *data, unsigned int size, uint32_t nTimeStamp )
{
guint64 janus_session_id = 0;
//一个RTMPPacket对应RTMP协议规范里面的一个块(Chunk)
RTMPPacket packet;
RTMPPacket_Reset( &packet );
/* Chunk Basic Header: HeaderType+ChannelID组成 1个字节
* >HeaderType(前两bit): 00->12字节 01->8字节
* >ChannelID(后6个bit): 02->Ping和ByteRead通道 03->Invoke通道 connect() publish()和自己写的NetConnection.Call() 04->Audio和Vidio通道
* 12字节举例
* Chunk Message Header: timestamp + message_length+message_typ + msg_stream_id */
//rtmp chunk header;
packet.m_packetType = packetType;
packet.m_nChannel = 0x04; //audio or video
packet.m_headerType = RTMP_PACKET_SIZE_LARGE;
packet.m_nTimeStamp = nTimeStamp;
packet.m_nInfoField2 = p->m_pub_rtmp.m_stream_id ;
packet.m_nBodySize = size;
packet.m_body = ( char* )( data + RTMP_MAX_HEADER_SIZE ) ;
//librtmp send interface; 应该是librtmp自动添加了basic header,messge handle etc
int iRet = RTMP_SendPacket( &p->m_pub_rtmp, &packet, 0 ) ;
....
}
标签:协议,packet,packetBody,nal,实现,iter,len,++,Rtmp 来源: https://blog.csdn.net/fdsafwagdagadg6576/article/details/122794560
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