void DVVideoFileServerMediaSubsession::seekStreamSource(FramedSource* inputSource, double seekNPT) {
// First, get the file source from "inputSource" (a framer):
DVVideoStreamFramer* framer = (DVVideoStreamFramer*)inputSource;
ByteStreamFileSource* fileSource = (ByteStreamFileSource*)(framer->inputSource());
// Then figure out where to seek to within the file:
if (fFileDuration > 0.0) {
u_int64_t seekByteNumber = (u_int64_t)(((int64_t)fFileSize*seekNPT)/fFileDuration);
fileSource->seekToByteAbsolute(seekByteNumber);
}
}
void DVVideoFileServerMediaSubsession
::setStreamSourceDuration(FramedSource* inputSource, double streamDuration, u_int64_t& numBytes) {
// First, get the file source from "inputSource" (a framer):
DVVideoStreamFramer* framer = (DVVideoStreamFramer*)inputSource;
ByteStreamFileSource* fileSource = (ByteStreamFileSource*)(framer->inputSource());
// Then figure out how many bytes to limit the streaming to:
if (fFileDuration > 0.0) {
numBytes = (u_int64_t)(((int64_t)fFileSize*streamDuration)/fFileDuration);
fileSource->seekToByteRelative(0, numBytes);
}
}
FramedSource* DVVideoFileServerMediaSubsession
::createNewStreamSource(unsigned /*clientSessionId*/, unsigned& estBitrate) {
// Create the video source:
ByteStreamFileSource* fileSource = ByteStreamFileSource::createNew(envir(), fFileName);
if (fileSource == NULL) return NULL;
fFileSize = fileSource->fileSize();
// Create a framer for the Video Elementary Stream:
DVVideoStreamFramer* framer = DVVideoStreamFramer::createNew(envir(), fileSource, True/*the file source is seekable*/);
// Use the framer to figure out the file's duration:
unsigned frameSize;
double frameDuration;
if (framer->getFrameParameters(frameSize, frameDuration)) {
fFileDuration = (float)(((int64_t)fFileSize*frameDuration)/(frameSize*1000000.0));
estBitrate = (unsigned)((8000.0*frameSize)/frameDuration); // in kbps
} else {
estBitrate = 50000; // kbps, estimate
}
return framer;
}
void DVVideoStreamFramer::afterGettingFrame(void* clientData, unsigned frameSize,
unsigned numTruncatedBytes,
struct timeval /*presentationTime*/, unsigned /*durationInMicroseconds*/) {
DVVideoStreamFramer* source = (DVVideoStreamFramer*)clientData;
source->afterGettingFrame1(frameSize, numTruncatedBytes);
}