/**********
|
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
|
