1. librtmp源码之RTMP_ClientPacket
// 处理消息（Message），并做出响应
int
RTMP_ClientPacket(RTMP *r, RTMPPacket *packet)
{
// 返回值为1表示推拉流正在正作中，为2表示已经停止
int bHasMediaPacket = 0;
switch (packet->m_packetType)
{
// RTMP消息类型ID=1,设置块大小
case RTMP_PACKET_TYPE_CHUNK_SIZE:
/* chunk size */
RTMP_Log(RTMP_LOGDEBUG, "CCQ: %s 处理消息 Set Chunk Size (typeID=1)", __FUNCTION__);
// 更新接收处理时的块限制
HandleChangeChunkSize(r, packet);
break;
// 对端反馈的已读大小
// RTMP消息类型ID=3
case RTMP_PACKET_TYPE_BYTES_READ_REPORT:
/* bytes read report */
RTMP_Log(RTMP_LOGDEBUG, "%s, received: bytes read report", __FUNCTION__);
break;
// RTMP消息类型ID=4，用户控制
// 处理对端发送的控制报文
case RTMP_PACKET_TYPE_CONTROL:
/* ctrl */
RTMP_Log(RTMP_LOGDEBUG, "CCQ: %s 处理消息 User Control (typeID=4)", __FUNCTION__);
HandleCtrl(r, packet);
break;
// RTMP消息类型ID=5
case RTMP_PACKET_TYPE_SERVER_BW:
/* server bw */
// 处理对端发送的应答窗口大小，这里由服务器发送，即告之客户端收到对应大小的数据后应发送反馈
RTMP_Log(RTMP_LOGDEBUG, "CCQ: %s 处理消息 Window Acknowledgement Size (typeID=5)", __FUNCTION__);
HandleServerBW(r, packet);
break;
// RTMP消息类型ID=6
case RTMP_PACKET_TYPE_CLIENT_BW:
/* client bw */
// 处理对端发送的设置发送带宽大小，这里由服务器发送，即设置客户端的发送带宽
RTMP_Log(RTMP_LOGDEBUG, "CCQ: %s 处理消息 Set Peer Bandwidth (typeID=6)", __FUNCTION__);
HandleClientBW(r, packet);
break;
// RTMP消息类型ID=8，音频数据
case RTMP_PACKET_TYPE_AUDIO:
/* audio data */
/*RTMP_Log(RTMP_LOGDEBUG, "%s, received: audio %lu bytes", __FUNCTION__, packet.m_nBodySize); */
HandleAudio(r, packet);
bHasMediaPacket = 1;
if (!r->m_mediaChannel)
r->m_mediaChannel = packet->m_nChannel;
if (!r->m_pausing)
r->m_mediaStamp = packet->m_nTimeStamp;
break;
// RTMP消息类型ID=9，视频数据
case RTMP_PACKET_TYPE_VIDEO:
/* video data */
/*RTMP_Log(RTMP_LOGDEBUG, "%s, received: video %lu bytes", __FUNCTION__, packet.m_nBodySize); */
HandleVideo(r, packet);
bHasMediaPacket = 1;
if (!r->m_mediaChannel)
r->m_mediaChannel = packet->m_nChannel;
if (!r->m_pausing)
r->m_mediaStamp = packet->m_nTimeStamp;
break;
// RTMP消息类型ID=15，AMF3编码，忽略
case RTMP_PACKET_TYPE_FLEX_STREAM_SEND:
/* flex stream send */
RTMP_Log(RTMP_LOGDEBUG,
"%s, flex stream send, size %u bytes, not supported, ignoring",
__FUNCTION__, packet->m_nBodySize);
break;
// RTMP消息类型ID=16，AMF3编码，忽略
case RTMP_PACKET_TYPE_FLEX_SHARED_OBJECT:
/* flex shared object */
RTMP_Log(RTMP_LOGDEBUG,
"%s, flex shared object, size %u bytes, not supported, ignoring",
__FUNCTION__, packet->m_nBodySize);
break;
// RTMP消息类型ID=17，AMF3编码，忽略
case RTMP_PACKET_TYPE_FLEX_MESSAGE:
/* flex message */
{
RTMP_Log(RTMP_LOGDEBUG,
"%s, flex message, size %u bytes, not fully supported",
__FUNCTION__, packet->m_nBodySize);
/*RTMP_LogHex(packet.m_body, packet.m_nBodySize); */
/* some DEBUG code */
#if 0
RTMP_LIB_AMFObject obj;
int nRes = obj.Decode(packet.m_body+1, packet.m_nBodySize-1);
if(nRes < 0) {
RTMP_Log(RTMP_LOGERROR, "%s, error decoding AMF3 packet", __FUNCTION__);
/*return; */
}
obj.Dump();
#endif
if (HandleInvoke(r, packet->m_body + 1, packet->m_nBodySize - 1) == 1)
bHasMediaPacket = 2;
break;
}
// RTMP消息类型ID=18，AMF0编码，数据消息
case RTMP_PACKET_TYPE_INFO:
/* metadata (notify) */
RTMP_Log(RTMP_LOGDEBUG, "%s, received: notify %u bytes", __FUNCTION__,
packet->m_nBodySize);
if (HandleMetadata(r, packet->m_body, packet->m_nBodySize))
bHasMediaPacket = 1;
break;
// RTMP消息类型ID=19，AMF0编码，忽略
case RTMP_PACKET_TYPE_SHARED_OBJECT:
RTMP_Log(RTMP_LOGDEBUG, "%s, shared object, not supported, ignoring",
__FUNCTION__);
break;
// RTMP消息类型ID=20，AMF0编码，命令消息
// 处理命令消息！
case RTMP_PACKET_TYPE_INVOKE:
/* invoke */
RTMP_Log(RTMP_LOGDEBUG, "%s, received: invoke %u bytes", __FUNCTION__,
packet->m_nBodySize);
RTMP_Log(RTMP_LOGDEBUG, "CCQ: %s 处理消息 (typeID=20，AMF0编码)", __FUNCTION__);
/*RTMP_LogHex(packet.m_body, packet.m_nBodySize); */
if (HandleInvoke(r, packet->m_body, packet->m_nBodySize) == 1)
bHasMediaPacket = 2;
break;
// RTMP消息类型ID=22
case RTMP_PACKET_TYPE_FLASH_VIDEO:
{
/* go through FLV packets and handle metadata packets */
unsigned int pos = 0;
uint32_t nTimeStamp = packet->m_nTimeStamp;
while (pos + 11 < packet->m_nBodySize)
{
uint32_t dataSize = AMF_DecodeInt24(packet->m_body + pos + 1); /* size without header (11) and prevTagSize (4) */
if (pos + 11 + dataSize + 4 > packet->m_nBodySize)
{
RTMP_Log(RTMP_LOGWARNING, "Stream corrupt?!");
break;
}
if (packet->m_body[pos] == 0x12)
{
HandleMetadata(r, packet->m_body + pos + 11, dataSize);
}
else if (packet->m_body[pos] == 8 || packet->m_body[pos] == 9)
{
nTimeStamp = AMF_DecodeInt24(packet->m_body + pos + 4);
nTimeStamp |= (packet->m_body[pos + 7] << 24);
}
pos += (11 + dataSize + 4);
}
if (!r->m_pausing)
r->m_mediaStamp = nTimeStamp;
/* FLV tag(s) */
/*RTMP_Log(RTMP_LOGDEBUG, "%s, received: FLV tag(s) %lu bytes", __FUNCTION__, packet.m_nBodySize); */
bHasMediaPacket = 1;
break;
}
default:
RTMP_Log(RTMP_LOGDEBUG, "%s, unknown packet type received: 0x%02x", __FUNCTION__,
packet->m_packetType);
#ifdef _DEBUG
RTMP_LogHex(RTMP_LOGDEBUG, packet->m_body, packet->m_nBodySize);
#endif
}
// 返回值为1表示推拉流正在正作中，为2表示已经停止
return bHasMediaPacket;
}
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