void MPEG2TransportFileServerMediaSubsession
::startStream(unsigned clientSessionId, void *streamToken, TaskFunc *rtcpRRHandler,
void *rtcpRRHandlerClientData, unsigned short &rtpSeqNum,
unsigned &rtpTimestamp,
ServerRequestAlternativeByteHandler *serverRequestAlternativeByteHandler,
void *serverRequestAlternativeByteHandlerClientData)
{
if (fIndexFile != NULL) // we support 'trick play'
{
ClientTrickPlayState *client = lookupClient(clientSessionId);
if (client != NULL && client->areChangingScale())
{
// First, handle this like a "PAUSE", except that we back up to the previous VSH
client->updateStateOnPlayChange(True);
OnDemandServerMediaSubsession::pauseStream(clientSessionId, streamToken);
// Then, adjust for the change of scale:
client->updateStateOnScaleChange();
}
}
// Call the original, default version of this routine:
OnDemandServerMediaSubsession::startStream(clientSessionId, streamToken,
rtcpRRHandler, rtcpRRHandlerClientData,
rtpSeqNum, rtpTimestamp,
serverRequestAlternativeByteHandler, serverRequestAlternativeByteHandlerClientData);
}
FramedSource* MPEG2TransportFileServerMediaSubsession
::createNewStreamSource(unsigned clientSessionId, unsigned& estBitrate) {
// Create the video source:
unsigned const inputDataChunkSize
= TRANSPORT_PACKETS_PER_NETWORK_PACKET*TRANSPORT_PACKET_SIZE;
ByteStreamFileSource* fileSource
= ByteStreamFileSource::createNew(envir(), fFileName, inputDataChunkSize);
if (fileSource == NULL) return NULL;
fFileSize = fileSource->fileSize();
// Use the file size and the duration to estimate the stream's bitrate:
if (fFileSize > 0 && fDuration > 0.0) {
estBitrate = (unsigned)((int64_t)fFileSize/(125*fDuration) + 0.5); // kbps, rounded
} else {
estBitrate = 5000; // kbps, estimate
}
// Create a framer for the Transport Stream:
MPEG2TransportStreamFramer* framer
= MPEG2TransportStreamFramer::createNew(envir(), fileSource);
if (fIndexFile != NULL) { // we support 'trick play'
// Keep state for this client (if we don't already have it):
ClientTrickPlayState* client = lookupClient(clientSessionId);
if (client == NULL) {
client = newClientTrickPlayState();
fClientSessionHashTable->Add((char const*)clientSessionId, client);
}
client->setSource(framer);
}
return framer;
}
void MPEG2TransportFileServerMediaSubsession
::pauseStream(unsigned clientSessionId, void* streamToken) {
if (fIndexFile != NULL) { // we support 'trick play'
ClientTrickPlayState* client = lookupClient(clientSessionId);
if (client != NULL) {
client->updateStateOnPlayChange(False);
}
}
// Call the original, default version of this routine:
OnDemandServerMediaSubsession::pauseStream(clientSessionId, streamToken);
}
void MPEG2TransportFileServerMediaSubsession
::setStreamScale(unsigned clientSessionId, void* streamToken, float scale) {
if (fIndexFile != NULL) { // we support 'trick play'
ClientTrickPlayState* client = lookupClient(clientSessionId);
if (client != NULL) {
client->setNextScale(scale); // scale won't take effect until the next "PLAY"
}
}
// Call the original, default version of this routine:
OnDemandServerMediaSubsession::setStreamScale(clientSessionId, streamToken, scale);
}
void MPEG2TransportFileServerMediaSubsession
::seekStream(unsigned clientSessionId, void* streamToken, double seekNPT) {
if (fIndexFile != NULL) { // we support 'trick play'
ClientTrickPlayState* client = lookupClient(clientSessionId);
if (client != NULL) {
client->updateStateFromNPT(seekNPT);
}
}
// Call the original, default version of this routine:
OnDemandServerMediaSubsession::seekStream(clientSessionId, streamToken, seekNPT);
}
void MPEG2TransportFileServerMediaSubsession
::seekStream(unsigned clientSessionId, void* streamToken, double& seekNPT, double streamDuration, u_int64_t& numBytes) {
// Begin by calling the original, default version of this routine:
OnDemandServerMediaSubsession::seekStream(clientSessionId, streamToken, seekNPT, streamDuration, numBytes);
// Then, special handling specific to indexed Transport Stream files:
if (fIndexFile != NULL) { // we support 'trick play'
ClientTrickPlayState* client = lookupClient(clientSessionId);
if (client != NULL) {
unsigned long numTSPacketsToStream = client->updateStateFromNPT(seekNPT, streamDuration);
numBytes = numTSPacketsToStream*TRANSPORT_PACKET_SIZE;
}
}
}
