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 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);
}
Boolean GSMAudioRTPSink
::frameCanAppearAfterPacketStart(unsigned char const* /*frameStart*/,
unsigned /*numBytesInFrame*/) const {
// Allow at most 5 frames in a single packet:
return numFramesUsedSoFar() < 5;
}
Boolean LiveAMRAudioRTPSink::frameCanAppearAfterPacketStart(unsigned char const* /*frameStart*/, unsigned /*numBytesInFrame*/) const {
return numFramesUsedSoFar() < AUDIO_FRAMES_PER_RTP_FRAME;
}
