| /********** |
| 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 3 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) 1996-2020 Live Networks, Inc. All rights reserved. |
| // RTP sink for VP9 video |
| // Implementation |
| |
| #include "VP9VideoRTPSink.hh" |
| |
| VP9VideoRTPSink |
| ::VP9VideoRTPSink(UsageEnvironment& env, Groupsock* RTPgs, unsigned char rtpPayloadFormat) |
| : VideoRTPSink(env, RTPgs, rtpPayloadFormat, 90000, "VP9") { |
| } |
| |
| VP9VideoRTPSink::~VP9VideoRTPSink() { |
| } |
| |
| VP9VideoRTPSink* |
| VP9VideoRTPSink::createNew(UsageEnvironment& env, Groupsock* RTPgs, unsigned char rtpPayloadFormat) { |
| return new VP9VideoRTPSink(env, RTPgs, rtpPayloadFormat); |
| } |
| |
| Boolean VP9VideoRTPSink |
| ::frameCanAppearAfterPacketStart(unsigned char const* /*frameStart*/, |
| unsigned /*numBytesInFrame*/) const { |
| // A packet can contain only one frame |
| return False; |
| } |
| |
| void VP9VideoRTPSink |
| ::doSpecialFrameHandling(unsigned fragmentationOffset, |
| unsigned char* /*frameStart*/, |
| unsigned /*numBytesInFrame*/, |
| struct timeval framePresentationTime, |
| unsigned numRemainingBytes) { |
| // Set the "VP9 Payload Descriptor" (just the minimal required 1-byte version): |
| u_int8_t vp9PayloadDescriptor = fragmentationOffset == 0 ? 0x10 : 0x00; |
| // I = L = F = V = U = 0; S = 1 iff this is the first (or only) fragment of the frame |
| |
| if (numRemainingBytes == 0) { |
| // This packet contains the last (or only) fragment of the frame. |
| // Set the E bit: |
| vp9PayloadDescriptor |= 0x08; |
| // Also set the RTP 'M' ('marker') bit: |
| setMarkerBit(); |
| } |
| |
| setSpecialHeaderBytes(&vp9PayloadDescriptor, 1); |
| |
| // Also set the RTP timestamp: |
| setTimestamp(framePresentationTime); |
| } |
| |
| |
| unsigned VP9VideoRTPSink::specialHeaderSize() const { |
| // We include only the required 1-byte form of the "VP9 Payload Descriptor": |
| return 1; |
| } |