96 lines
3.5 KiB
C++
Executable File
96 lines
3.5 KiB
C++
Executable File
/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2016 Live Networks, Inc. All rights reserved.
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// RTP sink for DV video (RFC 3189)
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// (Thanks to Ben Hutchings for prototyping this.)
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// Implementation
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#include "DVVideoRTPSink.hh"
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////////// DVVideoRTPSink implementation //////////
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DVVideoRTPSink
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::DVVideoRTPSink(UsageEnvironment& env, Groupsock* RTPgs, unsigned char rtpPayloadFormat)
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: VideoRTPSink(env, RTPgs, rtpPayloadFormat, 90000, "DV"),
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fFmtpSDPLine(NULL) {
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}
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DVVideoRTPSink::~DVVideoRTPSink() {
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delete[] fFmtpSDPLine;
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}
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DVVideoRTPSink*
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DVVideoRTPSink::createNew(UsageEnvironment& env, Groupsock* RTPgs, unsigned char rtpPayloadFormat) {
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return new DVVideoRTPSink(env, RTPgs, rtpPayloadFormat);
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}
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Boolean DVVideoRTPSink::sourceIsCompatibleWithUs(MediaSource& source) {
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// Our source must be an appropriate framer:
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return source.isDVVideoStreamFramer();
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}
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void DVVideoRTPSink::doSpecialFrameHandling(unsigned fragmentationOffset,
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unsigned char* /*frameStart*/,
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unsigned /*numBytesInFrame*/,
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struct timeval framePresentationTime,
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unsigned numRemainingBytes) {
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if (numRemainingBytes == 0) {
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// This packet contains the last (or only) fragment of the frame.
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// Set the RTP 'M' ('marker') bit:
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setMarkerBit();
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}
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// Also set the RTP timestamp:
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setTimestamp(framePresentationTime);
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}
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unsigned DVVideoRTPSink::computeOverflowForNewFrame(unsigned newFrameSize) const {
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unsigned initialOverflow = MultiFramedRTPSink::computeOverflowForNewFrame(newFrameSize);
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// Adjust (increase) this overflow, if necessary, so that the amount of frame data that we use is an integral number
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// of DIF blocks:
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unsigned numFrameBytesUsed = newFrameSize - initialOverflow;
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initialOverflow += numFrameBytesUsed%DV_DIF_BLOCK_SIZE;
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return initialOverflow;
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}
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char const* DVVideoRTPSink::auxSDPLine() {
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// Generate a new "a=fmtp:" line each time, using parameters from
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// our framer source (in case they've changed since the last time that
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// we were called):
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DVVideoStreamFramer* framerSource = (DVVideoStreamFramer*)fSource;
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if (framerSource == NULL) return NULL; // we don't yet have a source
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return auxSDPLineFromFramer(framerSource);
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}
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char const* DVVideoRTPSink::auxSDPLineFromFramer(DVVideoStreamFramer* framerSource) {
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char const* const profileName = framerSource->profileName();
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if (profileName == NULL) return NULL;
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char const* const fmtpSDPFmt = "a=fmtp:%d encode=%s;audio=bundled\r\n";
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unsigned fmtpSDPFmtSize = strlen(fmtpSDPFmt)
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+ 3 // max payload format code length
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+ strlen(profileName);
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delete[] fFmtpSDPLine; // if it already exists
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fFmtpSDPLine = new char[fmtpSDPFmtSize];
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sprintf(fFmtpSDPLine, fmtpSDPFmt, rtpPayloadType(), profileName);
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return fFmtpSDPLine;
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}
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