RTSP连接服务器和从服务器接收数据的处理流程

RTSP连接服务器是否成功，以及是否从服务器接收到实际播放的数据，主要是判断两个linux select函数的执行结果。
1.连接服务器的处理过程

ARTSPConnection::onConnect(const sp &msg) int err = ::connect( mSocket, (const struct sockaddr *)&remote, sizeof(remote)); LOGE("%s L%d err = %d", __FUNCTION__, __LINE__, err); if (err < 0) { if (errno == EINPROGRESS) { // 正在连接中 sp msg = new AMessage(kWhatCompleteConnection, id()); msg->setMessage("reply", reply); msg->setInt32("connection-id", mConnectionID); msg->post();调用---------->

void ARTSPConnection::onMessageReceived(const sp &msg) { case kWhatCompleteConnection: onCompleteConnection(msg);调用---------->
ARTSPConnection::onCompleteConnection int res = select(mSocket + 1, NULL, &ws, NULL, &tv); CHECK_GE(res, 0); if (res == 0) { // Timed out. Not yet connected. LOGE("%s L%d -ECONNABORTED", __FUNCTION__, __LINE__); msg->post(); // 循环执行此函数检查是否connected return; }
2.是否接收到服务器发送的播放数据的处理

2.1 在ARTSPConnection::onCompleteConnection成功连接后，发送检查接收数据的event

void ARTSPConnection::postReceiveReponseEvent() { if (mReceiveResponseEventPending) { return; } sp msg = new AMessage(kWhatReceiveResponse, id()); msg->post(); mReceiveResponseEventPending = true; }调用---------->

2.2 void ARTSPConnection::onMessageReceived(const sp &msg) {
case kWhatReceiveResponse:
onReceiveResponse();
break;
继续调用---------->
2.3
void ARTSPConnection::onReceiveResponse() { int res = select(mSocket + 1, &rs, NULL, NULL, &tv); // LOGE("%s L%d select res = %d", __FUNCTION__, __LINE__, res); CHECK_GE(res, 0); if (res == 1) { MakeSocketBlocking(mSocket, true); bool success = receiveRTSPReponse(); // 2.3.1 MakeSocketBlocking(mSocket, false); LOGE("%s L%d select ==== success = %d", __FUNCTION__, __LINE__, success); if (!success) { // Something horrible, irreparable has happened. flushPendingRequests(); LOGE("%s L%d return ", __FUNCTION__, __LINE__); return; } } postReceiveReponseEvent(); // 循环执行此函数 }

继续调用……

2.3.1 bool ARTSPConnection::receiveRTSPReponse() {

--->
2.3.1.1 bool ARTSPConnection::receiveLine(AString *line) {
--->
2.3.1.1.1 status_t ARTSPConnection::receive(void *data, size_t size) { // 每次读一个字符
--->
2.3.1.1.1.1 ssize_t n = recv(mSocket, (uint8_t *)data + offset, size - offset, 0); // 从TCP连接的另一端接收数据
--->
2.3.1.2 sp ARTSPConnection::receiveBinaryData()
--->
2.3.1.2.1 status_t ARTSPConnection::receive(void *data, size_t size) { // 每次读3个字符
--->
recv()
2.3.1.2.2 status_t ARTSPConnection::receive(void *data, size_t size) { // 每次读buffer->size()个字符
--->
recv()
--->
2.3.1.3 new ARTSPResponse
--->
2.3.1.4 receiveLine()
--->
2.3.1.5 recv() // while (numBytesRead < contentLength)
--->
2.3.1.6 函数返回
return isRequest
? handleServerRequest(response)
: notifyResponseListener(response);

附：
SDP: Session Description Protocol
[RFC4566]
http://www.ietf.org/rfc/rfc4566.txt