java aac rtp封装,aac over rtp live555 打包

void MPEG4GenericRTPSink

::doSpecialFrameHandling(unsigned fragmentationOffset,

unsigned char* frameStart,

unsigned numBytesInFrame,

struct timeval framePresentationTime,

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,

framePresentationTime,

numRemainingBytes);

}

参考rfc 3640

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