/
cetonrtsp.cpp
207 lines (175 loc) · 5.49 KB
/
cetonrtsp.cpp
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/** -*- Mode: c++ -*-
* CetonRTSP
* Copyright (c) 2011 Ronald Frazier
* Distributed as part of MythTV under GPL v2 and later.
*/
#include <QStringList>
#include <QTcpSocket>
// MythTV includes
#include "cetonrtsp.h"
#include "mythlogging.h"
#define LOC QString("CetonRTSP(%1-%2): ").arg(_ip).arg(_tuner)
QMutex CetonRTSP::_rtspMutex;
CetonRTSP::CetonRTSP(const QString &ip, uint tuner, ushort port) :
_ip(ip),
_port(port),
_tuner(tuner),
_sequenceNumber(0),
_sessionNumber(0),
_responseCode(-1)
{
_requestUrl = QString("rtsp://%1:%2/cetonmpeg%3")
.arg(ip).arg(port).arg(tuner);
}
bool CetonRTSP::ProcessRequest(
const QString &method, const QStringList* headers)
{
QMutexLocker locker(&_rtspMutex);
QTcpSocket socket;
socket.connectToHost(_ip, _port);
QStringList requestHeaders;
requestHeaders.append(QString("%1 %2 RTSP/1.0").arg(method, _requestUrl));
requestHeaders.append(QString("User-Agent: MythTV Ceton Recorder"));
requestHeaders.append(QString("CSeq: %1").arg(++_sequenceNumber));
if (_sessionNumber > 0)
requestHeaders.append(QString("Session: %1").arg(_sessionNumber));
if (headers != NULL)
{
for(int i = 0; i < headers->count(); i++)
{
QString header = headers->at(i);
requestHeaders.append(header);
}
}
requestHeaders.append(QString("\r\n"));
QString request = requestHeaders.join("\r\n");
LOG(VB_RECORD, LOG_DEBUG, LOC + QString("write: %1").arg(request));
socket.write(request.toAscii());
_responseHeaders.clear();
_responseContent.clear();
QRegExp firstLineRegex(
"^RTSP/1.0 (\\d+) ([^\r\n]+)", Qt::CaseSensitive, QRegExp::RegExp2);
QRegExp headerRegex(
"^([^:]+):\\s*([^\\r\\n]+)", Qt::CaseSensitive, QRegExp::RegExp2);
QRegExp blankLineRegex(
"^[\\r\\n]*$", Qt::CaseSensitive, QRegExp::RegExp2);
bool firstLine = true;
while (true)
{
if (!socket.canReadLine())
{
bool ready = socket.waitForReadyRead();
if (!ready)
{
LOG(VB_RECORD, LOG_ERR, LOC + "RTSP server did not respond");
return false;
}
continue;
}
QString line = socket.readLine();
LOG(VB_RECORD, LOG_DEBUG, LOC + QString("read: %1").arg(line));
if (firstLine)
{
if (firstLineRegex.indexIn(line) == -1)
{
_responseCode = -1;
_responseMessage =
QString("Could not parse first line of response: '%1'")
.arg(line);
return false;
}
QStringList parts = firstLineRegex.capturedTexts();
_responseCode = parts.at(1).toInt();
_responseMessage = parts.at(2);
firstLine = false;
continue;
}
if (blankLineRegex.indexIn(line) != -1) break;
if (headerRegex.indexIn(line) == -1)
{
_responseCode = -1;
_responseMessage = QString("Could not parse response header: '%1'")
.arg(line);
return false;
}
QStringList parts = headerRegex.capturedTexts();
_responseHeaders.insert(parts.at(1), parts.at(2));
}
QString cSeq = _responseHeaders.value("CSeq");
if (cSeq != QString("%1").arg(_sequenceNumber))
{
LOG(VB_RECORD, LOG_WARNING, LOC +
QString("Expected CSeq of %1 but got %2")
.arg(_sequenceNumber).arg(cSeq));
}
_responseContent.clear();
int contentLength = _responseHeaders.value("Content-Length").toInt();
if (contentLength > 0)
{
_responseContent.resize(contentLength);
char* data = _responseContent.data();
int bytesRead = 0;
while (bytesRead < contentLength)
{
if (socket.bytesAvailable() == 0)
socket.waitForReadyRead();
int count = socket.read(data+bytesRead, contentLength-bytesRead);
if (count == -1)
{
_responseCode = -1;
_responseMessage = "Could not read response content";
return false;
}
bytesRead += count;
}
}
return true;
}
bool CetonRTSP::GetOptions(QStringList &options)
{
if (ProcessRequest("OPTIONS"))
{
options = _responseHeaders.value("Public").split(",");
return true;
}
return false;
}
bool CetonRTSP::Describe(void)
{
if (!ProcessRequest("DESCRIBE"))
return false;
if (!_responseContent.contains("m=video 0 RTP/AVP 33"))
{
LOG(VB_RECORD, LOG_ERR, LOC + "expected content to be type "
"\"m=video 0 RTP/AVP 33\" but it appears not to be");
return false;
}
return true;
}
bool CetonRTSP::Setup(ushort clientPort1, ushort clientPort2)
{
QStringList extraHeaders;
extraHeaders.append(
QString("Transport: RTP/AVP;unicast;client_port=%1-%2")
.arg(clientPort1).arg(clientPort2));
if (!ProcessRequest("SETUP", &extraHeaders))
return false;
_sessionNumber = _responseHeaders.value("Session").toInt();
if (_sessionNumber == 0)
{
LOG(VB_RECORD, LOG_ERR, LOC +
"session number not found in SETUP response");
return false;
}
return true;
}
bool CetonRTSP::Play(void)
{
return ProcessRequest("PLAY");
}
bool CetonRTSP::Teardown(void)
{
bool result = ProcessRequest("TEARDOWN");
_sessionNumber = 0;
return result;
}