| /********** |
| 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. |
| // H.261 Video RTP Sources |
| // Implementation |
| |
| #include "H261VideoRTPSource.hh" |
| |
| H261VideoRTPSource* |
| H261VideoRTPSource::createNew(UsageEnvironment& env, Groupsock* RTPgs, |
| unsigned char rtpPayloadFormat, |
| unsigned rtpTimestampFrequency) { |
| return new H261VideoRTPSource(env, RTPgs, rtpPayloadFormat, |
| rtpTimestampFrequency); |
| } |
| |
| H261VideoRTPSource |
| ::H261VideoRTPSource(UsageEnvironment& env, Groupsock* RTPgs, |
| unsigned char rtpPayloadFormat, |
| unsigned rtpTimestampFrequency) |
| : MultiFramedRTPSource(env, RTPgs, |
| rtpPayloadFormat, rtpTimestampFrequency), |
| fLastSpecialHeader(0) { |
| } |
| |
| H261VideoRTPSource::~H261VideoRTPSource() { |
| } |
| |
| Boolean H261VideoRTPSource |
| ::processSpecialHeader(BufferedPacket* packet, |
| unsigned& resultSpecialHeaderSize) { |
| // There's a 4-byte video-specific header |
| if (packet->dataSize() < 4) return False; |
| |
| unsigned char* headerStart = packet->data(); |
| fLastSpecialHeader |
| = (headerStart[0]<<24)|(headerStart[1]<<16)|(headerStart[2]<<8)|headerStart[3]; |
| |
| #ifdef DELIVER_COMPLETE_FRAMES |
| fCurrentPacketBeginsFrame = fCurrentPacketCompletesFrame; |
| // whether the *previous* packet ended a frame |
| |
| // The RTP "M" (marker) bit indicates the last fragment of a frame: |
| fCurrentPacketCompletesFrame = packet->rtpMarkerBit(); |
| #endif |
| |
| resultSpecialHeaderSize = 4; |
| return True; |
| } |
| |
| char const* H261VideoRTPSource::MIMEtype() const { |
| return "video/H261"; |
| } |