void AMRAudioRTPSink::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* frameStart,
unsigned numBytesInFrame,
struct timeval framePresentationTime,
unsigned numRemainingBytes) {
// If this is the 1st frame in the 1st packet, set the RTP 'M' (marker)
// bit (because this is considered the start of a talk spurt):
if (isFirstPacket() && isFirstFrameInPacket()) {
setMarkerBit();
}
// If this is the first frame in the packet, set the 1-byte payload
// header (using CMR 15)
if (isFirstFrameInPacket()) {
u_int8_t payloadHeader = 0xF0;
setSpecialHeaderBytes(&payloadHeader, 1, 0);
}
// Set the TOC field for the current frame, based on the "FT" and "Q"
// values from our source:
AMRAudioSource* amrSource = (AMRAudioSource*)fSource;
if (amrSource == NULL) return; // sanity check
u_int8_t toc = amrSource->lastFrameHeader();
// Clear the "F" bit, because we're the last frame in this packet: #####
toc &=~ 0x80;
setSpecialHeaderBytes(&toc, 1, 1+numFramesUsedSoFar());
// Important: Also call our base class's doSpecialFrameHandling(),
// to set the packet's timestamp:
MultiFramedRTPSink::doSpecialFrameHandling(fragmentationOffset,
frameStart, numBytesInFrame,
framePresentationTime,
numRemainingBytes);
}
void MPEG4GenericRTPSink
::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* frameStart,
unsigned numBytesInFrame,
struct timeval frameTimestamp,
unsigned numRemainingBytes) {
// Set the "AU Header Section". This is 4 bytes: 2 bytes for the
// initial "AU-headers-length" field, and 2 bytes for the first
// (and only) "AU Header":
unsigned fullFrameSize
= fragmentationOffset + numBytesInFrame + numRemainingBytes;
unsigned char headers[4];
headers[0] = 0; headers[1] = 16 /* bits */; // AU-headers-length
headers[2] = fullFrameSize >> 5; headers[3] = (fullFrameSize&0x1F)<<3;
setSpecialHeaderBytes(headers, sizeof headers);
if (numRemainingBytes == 0) {
// This packet contains the last (or only) fragment of the frame.
// Set the RTP 'M' ('marker') bit:
setMarkerBit();
}
// Important: Also call our base class's doSpecialFrameHandling(),
// to set the packet's timestamp:
MultiFramedRTPSink::doSpecialFrameHandling(fragmentationOffset,
frameStart, numBytesInFrame,
frameTimestamp,
numRemainingBytes);
}
void JPEGVideoRTPSink
::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* /*frameStart*/,
unsigned /*numBytesInFrame*/,
struct timeval frameTimestamp,
unsigned numRemainingBytes) {
// Our source is known to be a JPEGVideoSource
JPEGVideoSource* source = (JPEGVideoSource*)fSource;
if (source == NULL) return; // sanity check
u_int8_t mainJPEGHeader[8]; // the special header
mainJPEGHeader[0] = 0; // Type-specific
mainJPEGHeader[1] = fragmentationOffset >> 16;
mainJPEGHeader[2] = fragmentationOffset >> 8;
mainJPEGHeader[3] = fragmentationOffset;
mainJPEGHeader[4] = source->type();
mainJPEGHeader[5] = source->qFactor();
mainJPEGHeader[6] = source->width();
mainJPEGHeader[7] = source->height();
setSpecialHeaderBytes(mainJPEGHeader, sizeof mainJPEGHeader);
if (fragmentationOffset == 0 && source->qFactor() >= 128) {
// There is also a Quantization Header:
u_int8_t precision;
u_int16_t length;
u_int8_t const* quantizationTables
= source->quantizationTables(precision, length);
unsigned const quantizationHeaderSize = 4 + length;
u_int8_t* quantizationHeader = new u_int8_t[quantizationHeaderSize];
quantizationHeader[0] = 0; // MBZ
quantizationHeader[1] = precision;
quantizationHeader[2] = length >> 8;
quantizationHeader[3] = length&0xFF;
if (quantizationTables != NULL) { // sanity check
for (u_int16_t i = 0; i < length; ++i) {
quantizationHeader[4+i] = quantizationTables[i];
}
}
setSpecialHeaderBytes(quantizationHeader, quantizationHeaderSize,
sizeof mainJPEGHeader /* start position */);
delete[] quantizationHeader;
}
void LiveAMRAudioRTPSink::doSpecialFrameHandling( unsigned fragmentationOffset, unsigned char* frameStart, unsigned numBytesInFrame, struct timeval frameTimestamp, unsigned numRemainingBytes )
{
#define AUDIO_FRAMES_PER_RTP_FRAME 5
// If this is the 1st frame in the 1st packet, set the RTP 'M' (marker)
// bit (because this is considered the start of a talk spurt):
if (isFirstPacket() && isFirstFrameInPacket()) {
setMarkerBit();
}
// If this is the first frame in the packet, set the 1-byte payload
// header (using CMR 15)
if (isFirstFrameInPacket()) {
u_int8_t payloadHeader = 0xF0;
setSpecialHeaderBytes(&payloadHeader, 1, 0);
}
// Set the TOC field for the current frame, based on the "FT" and "Q"
// values from our source:
LiveAMRAudioDeviceSource* amrSource = (LiveAMRAudioDeviceSource*)fSource;
if (amrSource == NULL) return; // sanity check
u_int8_t toc = amrSource->lastFrameHeader();
if (numFramesUsedSoFar() < AUDIO_FRAMES_PER_RTP_FRAME - 1) {
toc |= 0x80;
}
else {
toc &=~ 0x80;
}
setSpecialHeaderBytes(&toc, 1, 1+numFramesUsedSoFar());
// Removing toc in custom AMR device source
// update packet toc?
// Important: Also call our base class's doSpecialFrameHandling(),
// to set the packet's timestamp:
MultiFramedRTPSink::doSpecialFrameHandling(fragmentationOffset,
frameStart, numBytesInFrame,
frameTimestamp,
numRemainingBytes);
}
void JPEGVideoRTPSink
::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* /*frameStart*/,
unsigned /*numBytesInFrame*/,
struct timeval framePresentationTime,
unsigned numRemainingBytes) {
// Our source is known to be a JPEGVideoSource
JPEGVideoSource* source = (JPEGVideoSource*)fSource;
if (source == NULL) return; // sanity check
u_int8_t mainJPEGHeader[8]; // the special header
u_int8_t const type = source->type();
mainJPEGHeader[0] = 0; // Type-specific
mainJPEGHeader[1] = fragmentationOffset >> 16;
mainJPEGHeader[2] = fragmentationOffset >> 8;
mainJPEGHeader[3] = fragmentationOffset;
mainJPEGHeader[4] = type;
mainJPEGHeader[5] = source->qFactor();
mainJPEGHeader[6] = source->width();
mainJPEGHeader[7] = source->height();
setSpecialHeaderBytes(mainJPEGHeader, sizeof mainJPEGHeader);
unsigned restartMarkerHeaderSize = 0; // by default
if (type >= 64 && type <= 127) {
// There is also a Restart Marker Header:
restartMarkerHeaderSize = 4;
u_int16_t const restartInterval = source->restartInterval(); // should be non-zero
u_int8_t restartMarkerHeader[4];
restartMarkerHeader[0] = restartInterval>>8;
restartMarkerHeader[1] = restartInterval&0xFF;
restartMarkerHeader[2] = restartMarkerHeader[3] = 0xFF; // F=L=1; Restart Count = 0x3FFF
setSpecialHeaderBytes(restartMarkerHeader, restartMarkerHeaderSize,
sizeof mainJPEGHeader/* start position */);
}
void AC3AudioRTPSink
::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* frameStart,
unsigned numBytesInFrame,
struct timeval frameTimestamp,
unsigned numRemainingBytes) {
// Set the 2-byte "payload header", as defined in RFC 4184.
unsigned char headers[2];
Boolean isFragment = numRemainingBytes > 0 || fragmentationOffset > 0;
if (!isFragment) {
headers[0] = 0; // One or more complete frames
headers[1] = 1; // because we (for now) allow at most 1 frame per packet
} else {
if (fragmentationOffset > 0) {
headers[0] = 3; // Fragment of frame other than initial fragment
} else {
// An initial fragment of the frame
unsigned const totalFrameSize = fragmentationOffset + numBytesInFrame + numRemainingBytes;
unsigned const fiveEighthsPoint = totalFrameSize/2 + totalFrameSize/8;
headers[0] = numBytesInFrame >= fiveEighthsPoint ? 1 : 2;
// Because this outgoing packet will be full (because it's an initial fragment), we can compute how many total
// fragments (and thus packets) will make up the complete AC-3 frame:
fTotNumFragmentsUsed = (totalFrameSize + (numBytesInFrame-1))/numBytesInFrame;
}
headers[1] = fTotNumFragmentsUsed;
}
setSpecialHeaderBytes(headers, sizeof headers);
if (numRemainingBytes == 0) {
// This packet contains the last (or only) fragment of the frame.
// Set the RTP 'M' ('marker') bit:
setMarkerBit();
}
// Important: Also call our base class's doSpecialFrameHandling(),
// to set the packet's timestamp:
MultiFramedRTPSink::doSpecialFrameHandling(fragmentationOffset,
frameStart, numBytesInFrame,
frameTimestamp,
numRemainingBytes);
}
void VP8VideoRTPSink
::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* /*frameStart*/,
unsigned /*numBytesInFrame*/,
struct timeval framePresentationTime,
unsigned numRemainingBytes) {
// Set the "VP8 Payload Descriptor" (just the minimal required 1-byte version):
u_int8_t vp8PayloadDescriptor = fragmentationOffset == 0 ? 0x10 : 0x00;
// X = R = N = 0; PartID = 0; S = 1 iff this is the first (or only) fragment of the frame
setSpecialHeaderBytes(&vp8PayloadDescriptor, 1);
if (numRemainingBytes == 0) {
// This packet contains the last (or only) fragment of the frame.
// Set the RTP 'M' ('marker') bit:
setMarkerBit();
}
// Also set the RTP timestamp:
setTimestamp(framePresentationTime);
}
