| /********** |
| 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 MPEG video (RFC 2250) |
| // C++ header |
| |
| #ifndef _MPEG_1OR2_VIDEO_RTP_SINK_HH |
| #define _MPEG_1OR2_VIDEO_RTP_SINK_HH |
| |
| #ifndef _VIDEO_RTP_SINK_HH |
| #include "VideoRTPSink.hh" |
| #endif |
| |
| class MPEG1or2VideoRTPSink: public VideoRTPSink { |
| public: |
| static MPEG1or2VideoRTPSink* createNew(UsageEnvironment& env, Groupsock* RTPgs); |
| |
| protected: |
| MPEG1or2VideoRTPSink(UsageEnvironment& env, Groupsock* RTPgs); |
| // called only by createNew() |
| |
| virtual ~MPEG1or2VideoRTPSink(); |
| |
| private: // redefined virtual functions: |
| virtual Boolean sourceIsCompatibleWithUs(MediaSource& source); |
| |
| virtual void doSpecialFrameHandling(unsigned fragmentationOffset, |
| unsigned char* frameStart, |
| unsigned numBytesInFrame, |
| struct timeval framePresentationTime, |
| unsigned numRemainingBytes); |
| virtual Boolean allowFragmentationAfterStart() const; |
| virtual |
| Boolean frameCanAppearAfterPacketStart(unsigned char const* frameStart, |
| unsigned numBytesInFrame) const; |
| virtual unsigned specialHeaderSize() const; |
| |
| private: |
| // MPEG video-specific state, used to decide how to fill out the |
| // video-specific header, and when to include multiple 'frames' in a |
| // single outgoing RTP packet. Eventually we should somehow get this |
| // state from the source (MPEG1or2VideoStreamFramer) instead, as the source |
| // already has this info itself. |
| struct { |
| unsigned temporal_reference; |
| unsigned char picture_coding_type; |
| unsigned char vector_code_bits; // FBV,BFC,FFV,FFC from RFC 2250, sec. 3.4 |
| } fPictureState; |
| Boolean fPreviousFrameWasSlice; |
| // used to implement frameCanAppearAfterPacketStart() |
| Boolean fSequenceHeaderPresent; |
| Boolean fPacketBeginsSlice, fPacketEndsSlice; |
| }; |
| |
| #endif |