92 lines
3.2 KiB
C++
Executable File
92 lines
3.2 KiB
C++
Executable File
/**********
|
|
This library is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU Lesser General Public License as published by the
|
|
Free Software Foundation; either version 2.1 of the License, or (at your
|
|
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
|
|
|
|
This library is distributed in the hope that it will be useful, but WITHOUT
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
|
|
more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this library; if not, write to the Free Software Foundation, Inc.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
**********/
|
|
// "liveMedia"
|
|
// Copyright (c) 1996-2016 Live Networks, Inc. All rights reserved.
|
|
// RTP sink for H.263+ video (RFC 4629)
|
|
// Implementation
|
|
|
|
#include "H263plusVideoRTPSink.hh"
|
|
|
|
H263plusVideoRTPSink
|
|
::H263plusVideoRTPSink(UsageEnvironment& env, Groupsock* RTPgs,
|
|
unsigned char rtpPayloadFormat,
|
|
u_int32_t rtpTimestampFrequency)
|
|
: VideoRTPSink(env, RTPgs, rtpPayloadFormat, rtpTimestampFrequency, "H263-1998") {
|
|
}
|
|
|
|
H263plusVideoRTPSink::~H263plusVideoRTPSink() {
|
|
}
|
|
|
|
H263plusVideoRTPSink*
|
|
H263plusVideoRTPSink::createNew(UsageEnvironment& env, Groupsock* RTPgs,
|
|
unsigned char rtpPayloadFormat,
|
|
u_int32_t rtpTimestampFrequency) {
|
|
return new H263plusVideoRTPSink(env, RTPgs, rtpPayloadFormat, rtpTimestampFrequency);
|
|
}
|
|
|
|
Boolean H263plusVideoRTPSink
|
|
::frameCanAppearAfterPacketStart(unsigned char const* /*frameStart*/,
|
|
unsigned /*numBytesInFrame*/) const {
|
|
// A packet can contain only one frame
|
|
return False;
|
|
}
|
|
|
|
void H263plusVideoRTPSink
|
|
::doSpecialFrameHandling(unsigned fragmentationOffset,
|
|
unsigned char* frameStart,
|
|
unsigned numBytesInFrame,
|
|
struct timeval framePresentationTime,
|
|
unsigned numRemainingBytes) {
|
|
if (fragmentationOffset == 0) {
|
|
// This packet contains the first (or only) fragment of the frame.
|
|
// Set the 'P' bit in the special header:
|
|
unsigned short specialHeader = 0x0400;
|
|
|
|
// Also, reuse the first two bytes of the payload for this special
|
|
// header. (They should both have been zero.)
|
|
if (numBytesInFrame < 2) {
|
|
envir() << "H263plusVideoRTPSink::doSpecialFrameHandling(): bad frame size "
|
|
<< numBytesInFrame << "\n";
|
|
return;
|
|
}
|
|
if (frameStart[0] != 0 || frameStart[1] != 0) {
|
|
envir() << "H263plusVideoRTPSink::doSpecialFrameHandling(): unexpected non-zero first two bytes!\n";
|
|
}
|
|
frameStart[0] = specialHeader>>8;
|
|
frameStart[1] = (unsigned char)specialHeader;
|
|
} else {
|
|
unsigned short specialHeader = 0;
|
|
setSpecialHeaderBytes((unsigned char*)&specialHeader, 2);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
unsigned H263plusVideoRTPSink::specialHeaderSize() const {
|
|
// There's a 2-byte special video header. However, if we're the first
|
|
// (or only) fragment of a frame, then we reuse the first 2 bytes of
|
|
// the payload instead.
|
|
return (curFragmentationOffset() == 0) ? 0 : 2;
|
|
}
|