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 AMRAudioFileSink::afterGettingFrame1(unsigned frameSize,
struct timeval presentationTime) {
AMRAudioSource* source = (AMRAudioSource*)fSource;
if (!fHaveWrittenHeader && fPerFrameFileNameBuffer == NULL) {
// Output the appropriate AMR header to the start of the file.
// This header is defined in RFC 3267, section 5.
// (However, we don't do this if we're creating one file per frame.)
char headerBuffer[100];
sprintf(headerBuffer, "#!AMR%s%s\n",
source->isWideband() ? "-WB" : "",
source->numChannels() > 1 ? "_MC1.0" : "");
unsigned headerLength = strlen(headerBuffer);
if (source->numChannels() > 1) {
// Also add a 32-bit channel description field:
headerBuffer[headerLength++] = 0;
headerBuffer[headerLength++] = 0;
headerBuffer[headerLength++] = 0;
headerBuffer[headerLength++] = source->numChannels();
}
addData((unsigned char*)headerBuffer, headerLength, presentationTime);
}
fHaveWrittenHeader = True;
// Add the 1-byte header, before writing the file data proper:
// (Again, we don't do this if we're creating one file per frame.)
if (fPerFrameFileNameBuffer == NULL) {
u_int8_t frameHeader = source->lastFrameHeader();
addData(&frameHeader, 1, presentationTime);
}
// Call the parent class to complete the normal file write with the input data:
FileSink::afterGettingFrame1(frameSize, presentationTime);
}
