1/**********
2This library is free software; you can redistribute it and/or modify it under
3the terms of the GNU Lesser General Public License as published by the
4Free Software Foundation; either version 3 of the License, or (at your
5option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
6
7This library is distributed in the hope that it will be useful, but WITHOUT
8ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
9FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
10more details.
11
12You should have received a copy of the GNU Lesser General Public License
13along with this library; if not, write to the Free Software Foundation, Inc.,
1451 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15**********/
16// "liveMedia"
17// Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved.
18// RTP sink for VP9 video
19// Implementation
20
21#include "VP9VideoRTPSink.hh"
22
23VP9VideoRTPSink
24::VP9VideoRTPSink(UsageEnvironment& env, Groupsock* RTPgs, unsigned char rtpPayloadFormat)
25 : VideoRTPSink(env, RTPgs, rtpPayloadFormat, 90000, "VP9") {
26}
27
28VP9VideoRTPSink::~VP9VideoRTPSink() {
29}
30
31VP9VideoRTPSink*
32VP9VideoRTPSink::createNew(UsageEnvironment& env, Groupsock* RTPgs, unsigned char rtpPayloadFormat) {
33 return new VP9VideoRTPSink(env, RTPgs, rtpPayloadFormat);
34}
35
36Boolean VP9VideoRTPSink
37::frameCanAppearAfterPacketStart(unsigned char const* /*frameStart*/,
38 unsigned /*numBytesInFrame*/) const {
39 // A packet can contain only one frame
40 return False;
41}
42
43void VP9VideoRTPSink
44::doSpecialFrameHandling(unsigned fragmentationOffset,
45 unsigned char* /*frameStart*/,
46 unsigned /*numBytesInFrame*/,
47 struct timeval framePresentationTime,
48 unsigned numRemainingBytes) {
49 // Set the "VP9 Payload Descriptor" (just the minimal required 1-byte version):
50 u_int8_t vp9PayloadDescriptor = fragmentationOffset == 0 ? 0x10 : 0x00;
51 // I = L = F = V = U = 0; S = 1 iff this is the first (or only) fragment of the frame
52
53 if (numRemainingBytes == 0) {
54 // This packet contains the last (or only) fragment of the frame.
55 // Set the E bit:
56 vp9PayloadDescriptor |= 0x08;
57 // Also set the RTP 'M' ('marker') bit:
58 setMarkerBit();
59 }
60
61 setSpecialHeaderBytes(&vp9PayloadDescriptor, 1);
62
63 // Also set the RTP timestamp:
64 setTimestamp(framePresentationTime);
65}
66
67
68unsigned VP9VideoRTPSink::specialHeaderSize() const {
69 // We include only the required 1-byte form of the "VP9 Payload Descriptor":
70 return 1;
71}
72