| /********** |
| 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. |
| // A filter that parses a DV input stream into DV frames to deliver to the downstream object |
| // C++ header |
| |
| #ifndef _DV_VIDEO_STREAM_FRAMER_HH |
| #define _DV_VIDEO_STREAM_FRAMER_HH |
| |
| #ifndef _FRAMED_FILTER_HH |
| #include "FramedFilter.hh" |
| #endif |
| |
| #define DV_DIF_BLOCK_SIZE 80 |
| #define DV_NUM_BLOCKS_PER_SEQUENCE 150 |
| #define DV_SAVED_INITIAL_BLOCKS_SIZE ((DV_NUM_BLOCKS_PER_SEQUENCE+6-1)*DV_DIF_BLOCK_SIZE) |
| /* enough data to ensure that it contains an intact 6-block header (which occurs at the start of a 150-block sequence) */ |
| |
| class DVVideoStreamFramer: public FramedFilter { |
| public: |
| static DVVideoStreamFramer* |
| createNew(UsageEnvironment& env, FramedSource* inputSource, |
| Boolean sourceIsSeekable = False, Boolean leavePresentationTimesUnmodified = False); |
| // Set "sourceIsSeekable" to True if the input source is a seekable object (e.g. a file), and the server that uses us |
| // does a seek-to-zero on the source before reading from it. (Our RTSP server implementation does this.) |
| char const* profileName(); |
| Boolean getFrameParameters(unsigned& frameSize/*bytes*/, double& frameDuration/*microseconds*/); |
| |
| protected: |
| DVVideoStreamFramer(UsageEnvironment& env, FramedSource* inputSource, |
| Boolean sourceIsSeekable, Boolean leavePresentationTimesUnmodified); |
| // called only by createNew(), or by subclass constructors |
| virtual ~DVVideoStreamFramer(); |
| |
| protected: |
| // redefined virtual functions: |
| virtual Boolean isDVVideoStreamFramer() const; |
| virtual void doGetNextFrame(); |
| |
| protected: |
| void getAndDeliverData(); // used to implement "doGetNextFrame()" |
| static void afterGettingFrame(void* clientData, unsigned frameSize, |
| unsigned numTruncatedBytes, |
| struct timeval presentationTime, |
| unsigned durationInMicroseconds); |
| void afterGettingFrame(unsigned frameSize, unsigned numTruncatedBytes, struct timeval presentationTime); |
| void getProfile(); |
| |
| protected: |
| Boolean fLeavePresentationTimesUnmodified; |
| void const* fOurProfile; |
| struct timeval fNextFramePresentationTime; |
| unsigned char fSavedInitialBlocks[DV_SAVED_INITIAL_BLOCKS_SIZE]; |
| char fInitialBlocksPresent; |
| Boolean fSourceIsSeekable; |
| }; |
| |
| #endif |