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| | |
| | | /********** |
| | | 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) 1996-2017 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 |