void AMRAudioEncoder
::afterGettingFrame1(unsigned frameSize, unsigned numTruncatedBytes,
struct timeval presentationTime, unsigned durationInMicroseconds) {
// Adjust presentationTime to allow for the data that's still in our buffer:
int uSecondsAdjustment
= (int)(fInputSampleBufferBytesFull*fMicrosecondsPerByte);
presentationTime.tv_sec -= uSecondsAdjustment/MILLION;
uSecondsAdjustment %= MILLION;
if (presentationTime.tv_usec < uSecondsAdjustment) {
--presentationTime.tv_sec;
presentationTime.tv_usec += MILLION;
}
presentationTime.tv_usec -= uSecondsAdjustment;
// Don't allow the presentation time to decrease:
if (presentationTime.tv_sec > fLastInputDataPresentationTime.tv_sec ||
(presentationTime.tv_sec == fLastInputDataPresentationTime.tv_sec &&
presentationTime.tv_usec > fLastInputDataPresentationTime.tv_usec)) {
fLastInputDataPresentationTime = presentationTime;
}
fInputSampleBufferBytesFull += frameSize;
// Try again to encode and deliver data to the sink:
doGetNextFrame();
}
void FramedSource::getNextFrame(unsigned char* to, unsigned maxSize,
afterGettingFunc* afterGettingFunc,
void* afterGettingClientData,
onCloseFunc* onCloseFunc,
void* onCloseClientData) {
// Make sure we're not already being read:
if (fIsCurrentlyAwaitingData) {
envir() << "FramedSource[" << this << "]::getNextFrame(): attempting to read more than once at the same time!\n";
envir().internalError();
}
liveLogInfo(" FramedSource::getNextFrame \n");
fTo = to;
fMaxSize = maxSize;
fNumTruncatedBytes = 0; // by default; could be changed by doGetNextFrame()
fDurationInMicroseconds = 0; // by default; could be changed by doGetNextFrame()
fAfterGettingFunc = afterGettingFunc;
fAfterGettingClientData = afterGettingClientData;
fOnCloseFunc = onCloseFunc;
fOnCloseClientData = onCloseClientData;
fIsCurrentlyAwaitingData = True;
doGetNextFrame();
}
void AMRDeinterleaver
::afterGettingFrame1(unsigned frameSize, struct timeval presentationTime) {
RawAMRRTPSource* source = (RawAMRRTPSource*)fInputSource;
// First, put the frame into our deinterleaving buffer:
fDeinterleavingBuffer->deliverIncomingFrame(frameSize, source, presentationTime);
// Then, try delivering a frame to the client (if he wants one):
if (fNeedAFrame) doGetNextFrame();
}
void H264FUAFragmenter::afterGettingFrame1(unsigned frameSize,
unsigned numTruncatedBytes,
struct timeval presentationTime,
unsigned durationInMicroseconds) {
fNumValidDataBytes += frameSize;
fSaveNumTruncatedBytes = numTruncatedBytes;
fPresentationTime = presentationTime;
fDurationInMicroseconds = durationInMicroseconds;
// Deliver data to the client:
doGetNextFrame();
}
void ByteStreamMultiFileSource::onSourceClosure1() {
// This routine was called because the currently-read source was closed
// (probably due to EOF). Close this source down, and move to the
// next one:
ByteStreamFileSource*& source
= fSourceArray[fCurrentlyReadSourceNumber++];
Medium::close(source);
source = NULL;
// Try reading again:
doGetNextFrame();
}
void QCELPDeinterleaver
::afterGettingFrame1(unsigned frameSize, struct timeval presentationTime) {
RawQCELPRTPSource* source = (RawQCELPRTPSource*)fInputSource;
// First, put the frame into our deinterleaving buffer:
fDeinterleavingBuffer
->deliverIncomingFrame(frameSize, source->interleaveL(),
source->interleaveN(), source->frameIndex(),
source->curPacketRTPSeqNum(),
presentationTime);
// Then, try delivering a frame to the client (if he wants one):
if (fNeedAFrame) doGetNextFrame();
}
void MPEG2TransportStreamAccumulator
::afterGettingFrame1(unsigned frameSize,
unsigned numTruncatedBytes,
struct timeval presentationTime,
unsigned durationInMicroseconds) {
if (fNumBytesGathered == 0) { // this is the first frame of the new chunk
fPresentationTime = presentationTime;
fDurationInMicroseconds = 0;
}
fNumBytesGathered += frameSize;
fTo += frameSize;
fMaxSize -= frameSize;
fDurationInMicroseconds += durationInMicroseconds;
// Try again to complete delivery:
doGetNextFrame();
}
Boolean ADUFromMP3Source::doGetNextFrame1() {
// First, check whether we have enough previously-read data to output an
// ADU for the last-read MP3 frame:
unsigned tailIndex;
Segment* tailSeg;
Boolean needMoreData;
if (fSegments->isEmpty()) {
needMoreData = True;
tailSeg = NULL; tailIndex = 0; // unneeded, but stops compiler warnings
} else {
tailIndex = SegmentQueue::prevIndex(fSegments->nextFreeIndex());
tailSeg = &(fSegments->s[tailIndex]);
needMoreData
= fTotalDataSizeBeforePreviousRead < tailSeg->backpointer // bp points back too far
|| tailSeg->backpointer + tailSeg->dataHere() < tailSeg->aduSize; // not enough data
}
if (needMoreData) {
// We don't have enough data to output an ADU from the last-read MP3
// frame, so need to read another one and try again:
doGetNextFrame();
return True;
}
// Output an ADU from the tail segment:
fFrameSize = tailSeg->headerSize+tailSeg->sideInfoSize+tailSeg->aduSize;
fPresentationTime = tailSeg->presentationTime;
fDurationInMicroseconds = tailSeg->durationInMicroseconds;
unsigned descriptorSize
= fIncludeADUdescriptors ? ADUdescriptor::computeSize(fFrameSize) : 0;
#ifdef DEBUG
fprintf(stderr, "m->a:outputting ADU %d<-%d, nbr:%d, sis:%d, dh:%d, (descriptor size: %d)\n", tailSeg->aduSize, tailSeg->backpointer, fFrameSize, tailSeg->sideInfoSize, tailSeg->dataHere(), descriptorSize);
#endif
if (descriptorSize + fFrameSize > fMaxSize) {
envir() << "ADUFromMP3Source::doGetNextFrame1(): not enough room ("
<< descriptorSize + fFrameSize << ">"
<< fMaxSize << ")\n";
fFrameSize = 0;
return False;
}
unsigned char* toPtr = fTo;
// output the ADU descriptor:
if (fIncludeADUdescriptors) {
fFrameSize += ADUdescriptor::generateDescriptor(toPtr, fFrameSize);
}
// output header and side info:
memmove(toPtr, tailSeg->dataStart(),
tailSeg->headerSize + tailSeg->sideInfoSize);
toPtr += tailSeg->headerSize + tailSeg->sideInfoSize;
// go back to the frame that contains the start of our data:
unsigned offset = 0;
unsigned i = tailIndex;
unsigned prevBytes = tailSeg->backpointer;
while (prevBytes > 0) {
i = SegmentQueue::prevIndex(i);
unsigned dataHere = fSegments->s[i].dataHere();
if (dataHere < prevBytes) {
prevBytes -= dataHere;
} else {
offset = dataHere - prevBytes;
break;
}
}
// dequeue any segments that we no longer need:
while (fSegments->headIndex() != i) {
fSegments->dequeue(); // we're done with it
}
unsigned bytesToUse = tailSeg->aduSize;
while (bytesToUse > 0) {
Segment& seg = fSegments->s[i];
unsigned char* fromPtr
= &seg.dataStart()[seg.headerSize + seg.sideInfoSize + offset];
unsigned dataHere = seg.dataHere() - offset;
unsigned bytesUsedHere = dataHere < bytesToUse ? dataHere : bytesToUse;
memmove(toPtr, fromPtr, bytesUsedHere);
bytesToUse -= bytesUsedHere;
toPtr += bytesUsedHere;
offset = 0;
i = SegmentQueue::nextIndex(i);
}
if (fFrameCounter++%fScale == 0) {
// Call our own 'after getting' function. Because we're not a 'leaf'
// source, we can call this directly, without risking infinite recursion.
afterGetting(this);
} else {
// Don't use this frame; get another one:
doGetNextFrame();
}
return True;
}
void MPEG1or2VideoStreamDiscreteFramer
::afterGettingFrame1(unsigned frameSize, unsigned numTruncatedBytes,
struct timeval presentationTime,
unsigned durationInMicroseconds) {
// Check that the first 4 bytes are a system code:
if (frameSize >= 4 && fTo[0] == 0 && fTo[1] == 0 && fTo[2] == 1) {
fPictureEndMarker = True; // Assume that we have a complete 'picture' here
u_int8_t nextCode = fTo[3];
if (nextCode == 0xB3) { // VIDEO_SEQUENCE_HEADER_START_CODE
// Note the following 'frame rate' code:
if (frameSize >= 8) {
u_int8_t frame_rate_code = fTo[7]&0x0F;
fFrameRate = frameRateFromCode[frame_rate_code];
}
// Also, save away this Video Sequence Header, in case we need it later:
// First, figure out how big it is:
unsigned vshSize;
for (vshSize = 4; vshSize < frameSize-3; ++vshSize) {
if (fTo[vshSize] == 0 && fTo[vshSize+1] == 0 && fTo[vshSize+2] == 1 &&
(fTo[vshSize+3] == 0xB8 || fTo[vshSize+3] == 0x00)) break;
}
if (vshSize == frameSize-3) vshSize = frameSize; // There was nothing else following it
if (vshSize <= sizeof fSavedVSHBuffer) {
memmove(fSavedVSHBuffer, fTo, vshSize);
fSavedVSHSize = vshSize;
fSavedVSHTimestamp
= presentationTime.tv_sec + presentationTime.tv_usec/(double)MILLION;
}
} else if (nextCode == 0xB8) { // GROUP_START_CODE
// If necessary, insert a saved Video Sequence Header in front of this:
double pts = presentationTime.tv_sec + presentationTime.tv_usec/(double)MILLION;
if (pts > fSavedVSHTimestamp + fVSHPeriod &&
fSavedVSHSize + frameSize <= fMaxSize) {
memmove(&fTo[fSavedVSHSize], &fTo[0], frameSize); // make room for the header
memmove(&fTo[0], fSavedVSHBuffer, fSavedVSHSize); // insert it
frameSize += fSavedVSHSize;
fSavedVSHTimestamp = pts;
}
}
unsigned i = 3;
if (nextCode == 0xB3 /*VIDEO_SEQUENCE_HEADER_START_CODE*/ ||
nextCode == 0xB8 /*GROUP_START_CODE*/) {
// Skip to the following PICTURE_START_CODE (if any):
for (i += 4; i < frameSize; ++i) {
if (fTo[i] == 0x00 /*PICTURE_START_CODE*/
&& fTo[i-1] == 1 && fTo[i-2] == 0 && fTo[i-3] == 0) {
nextCode = fTo[i];
break;
}
}
}
if (nextCode == 0x00 /*PICTURE_START_CODE*/ && i+2 < frameSize) {
// Get the 'temporal_reference' and 'picture_coding_type' from the
// following 2 bytes:
++i;
unsigned short temporal_reference = (fTo[i]<<2)|(fTo[i+1]>>6);
unsigned char picture_coding_type = (fTo[i+1]&0x38)>>3;
// If this is not an "I" frame, but we were asked for "I" frames only, then try again:
if (fIFramesOnly && picture_coding_type != 1) {
doGetNextFrame();
return;
}
// If this is a "B" frame, then we have to tweak "presentationTime":
if (picture_coding_type == 3/*B*/
&& (fLastNonBFramePresentationTime.tv_usec > 0 ||
fLastNonBFramePresentationTime.tv_sec > 0)) {
int trIncrement
= fLastNonBFrameTemporal_reference - temporal_reference;
if (trIncrement < 0) trIncrement += 1024; // field is 10 bits in size
unsigned usIncrement = fFrameRate == 0.0 ? 0
: (unsigned)((trIncrement*MILLION)/fFrameRate);
unsigned secondsToSubtract = usIncrement/MILLION;
unsigned uSecondsToSubtract = usIncrement%MILLION;
presentationTime = fLastNonBFramePresentationTime;
if ((unsigned)presentationTime.tv_usec < uSecondsToSubtract) {
presentationTime.tv_usec += MILLION;
if (presentationTime.tv_sec > 0) --presentationTime.tv_sec;
}
presentationTime.tv_usec -= uSecondsToSubtract;
if ((unsigned)presentationTime.tv_sec > secondsToSubtract) {
presentationTime.tv_sec -= secondsToSubtract;
} else {
presentationTime.tv_sec = presentationTime.tv_usec = 0;
}
} else {
fLastNonBFramePresentationTime = presentationTime;
fLastNonBFrameTemporal_reference = temporal_reference;
}
}
