109 lines
3.3 KiB
C++
Executable File
109 lines
3.3 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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// VP9 Video RTP Sources
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// Implementation
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#include "VP9VideoRTPSource.hh"
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VP9VideoRTPSource*
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VP9VideoRTPSource::createNew(UsageEnvironment& env, Groupsock* RTPgs,
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unsigned char rtpPayloadFormat,
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unsigned rtpTimestampFrequency) {
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return new VP9VideoRTPSource(env, RTPgs, rtpPayloadFormat,
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rtpTimestampFrequency);
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}
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VP9VideoRTPSource
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::VP9VideoRTPSource(UsageEnvironment& env, Groupsock* RTPgs,
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unsigned char rtpPayloadFormat,
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unsigned rtpTimestampFrequency)
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: MultiFramedRTPSource(env, RTPgs, rtpPayloadFormat, rtpTimestampFrequency) {
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}
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VP9VideoRTPSource::~VP9VideoRTPSource() {
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}
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#define incrHeader do { ++resultSpecialHeaderSize; ++headerStart; if (--packetSize == 0) return False; } while (0)
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Boolean VP9VideoRTPSource
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::processSpecialHeader(BufferedPacket* packet,
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unsigned& resultSpecialHeaderSize) {
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unsigned char* headerStart = packet->data();
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unsigned packetSize = packet->dataSize();
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// Figure out the size of the special header.
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if (packetSize == 0) return False; // error
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resultSpecialHeaderSize = 1; // unless we learn otherwise
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u_int8_t const byte1 = *headerStart;
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Boolean const I = (byte1&0x80) != 0;
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Boolean const L = (byte1&0x40) != 0;
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Boolean const F = (byte1&0x20) != 0;
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Boolean const B = (byte1&0x10) != 0;
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Boolean const E = (byte1&0x08) != 0;
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Boolean const V = (byte1&0x04) != 0;
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Boolean const U = (byte1&0x02) != 0;
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fCurrentPacketBeginsFrame = B;
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fCurrentPacketCompletesFrame = E;
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// use this instead of the RTP header's 'M' bit (which might not be accurate)
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if (I) { // PictureID present
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incrHeader;
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Boolean const M = ((*headerStart)&0x80) != 0;
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if (M) incrHeader;
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}
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if (L) { // Layer indices present
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incrHeader;
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if (F) { // Reference indices present
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incrHeader;
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unsigned R = (*headerStart)&0x03;
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while (R-- > 0) {
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incrHeader;
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Boolean const X = ((*headerStart)&0x10) != 0;
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if (X) incrHeader;
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}
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}
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}
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if (V) { // Scalability Structure (SS) present
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incrHeader;
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unsigned patternLength = *headerStart;
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while (patternLength-- > 0) {
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incrHeader;
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unsigned R = (*headerStart)&0x03;
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while (R-- > 0) {
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incrHeader;
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Boolean const X = ((*headerStart)&0x10) != 0;
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if (X) incrHeader;
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}
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}
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}
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if (U) { // Scalability Structure Update (SU) present
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return False; // This structure isn't yet defined in the VP9 payload format I-D
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}
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return True;
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}
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char const* VP9VideoRTPSource::MIMEtype() const {
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return "video/VP9";
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}
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