73 lines
3.0 KiB
C++
73 lines
3.0 KiB
C++
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/**********
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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) 1996-2015 Live Networks, Inc. All rights reserved.
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// A filter that parses a DV input stream into DV frames to deliver to the downstream object
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// C++ header
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#ifndef _DV_VIDEO_STREAM_FRAMER_HH
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#define _DV_VIDEO_STREAM_FRAMER_HH
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#ifndef _FRAMED_FILTER_HH
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#include "FramedFilter.hh"
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#endif
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#define DV_DIF_BLOCK_SIZE 80
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#define DV_NUM_BLOCKS_PER_SEQUENCE 150
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#define DV_SAVED_INITIAL_BLOCKS_SIZE ((DV_NUM_BLOCKS_PER_SEQUENCE+6-1)*DV_DIF_BLOCK_SIZE)
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/* enough data to ensure that it contains an intact 6-block header (which occurs at the start of a 150-block sequence) */
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class DVVideoStreamFramer: public FramedFilter {
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public:
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static DVVideoStreamFramer*
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createNew(UsageEnvironment& env, FramedSource* inputSource,
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Boolean sourceIsSeekable = False, Boolean leavePresentationTimesUnmodified = False);
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// Set "sourceIsSeekable" to True if the input source is a seekable object (e.g. a file), and the server that uses us
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// does a seek-to-zero on the source before reading from it. (Our RTSP server implementation does this.)
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char const* profileName();
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Boolean getFrameParameters(unsigned& frameSize/*bytes*/, double& frameDuration/*microseconds*/);
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protected:
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DVVideoStreamFramer(UsageEnvironment& env, FramedSource* inputSource,
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Boolean sourceIsSeekable, Boolean leavePresentationTimesUnmodified);
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// called only by createNew(), or by subclass constructors
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virtual ~DVVideoStreamFramer();
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protected:
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// redefined virtual functions:
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virtual Boolean isDVVideoStreamFramer() const;
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virtual void doGetNextFrame();
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protected:
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void getAndDeliverData(); // used to implement "doGetNextFrame()"
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static void afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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void afterGettingFrame(unsigned frameSize, unsigned numTruncatedBytes, struct timeval presentationTime);
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void getProfile();
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protected:
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Boolean fLeavePresentationTimesUnmodified;
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void const* fOurProfile;
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struct timeval fNextFramePresentationTime;
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unsigned char fSavedInitialBlocks[DV_SAVED_INITIAL_BLOCKS_SIZE];
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char fInitialBlocksPresent;
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Boolean fSourceIsSeekable;
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};
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#endif
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