ByteStreamFileSource.hh

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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.,
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**********/
// "liveMedia"
// Copyright (c) 1996-2024 Live Networks, Inc.  All rights reserved.
// A file source that is a plain byte stream (rather than frames)
// C++ header
 
#ifndef _BYTE_STREAM_FILE_SOURCE_HH
#define _BYTE_STREAM_FILE_SOURCE_HH
 
#ifndef _FRAMED_FILE_SOURCE_HH
#include "FramedFileSource.hh"
#endif
 
class ByteStreamFileSource: public FramedFileSource {
public:
  static ByteStreamFileSource* createNew(UsageEnvironment& env,
                                         char const* fileName,
                                         unsigned preferredFrameSize = 0,
                                         unsigned playTimePerFrame = 0);
  // "preferredFrameSize" == 0 means 'no preference'
  // "playTimePerFrame" is in microseconds
 
  static ByteStreamFileSource* createNew(UsageEnvironment& env,
                                         FILE* fid,
                                         unsigned preferredFrameSize = 0,
                                         unsigned playTimePerFrame = 0);
      // an alternative version of "createNew()" that's used if you already have
      // an open file.
 
  u_int64_t fileSize() const { return fFileSize; }
      // 0 means zero-length, unbounded, or unknown
 
  void seekToByteAbsolute(u_int64_t byteNumber, u_int64_t numBytesToStream = 0);
    // if "numBytesToStream" is >0, then we limit the stream to that number of bytes, before treating it as EOF
  void seekToByteRelative(int64_t offset, u_int64_t numBytesToStream = 0);
  void seekToEnd(); // to force EOF handling on the next read
 
protected:
  ByteStreamFileSource(UsageEnvironment& env,
                       FILE* fid,
                       unsigned preferredFrameSize,
                       unsigned playTimePerFrame);
        // called only by createNew()
 
  virtual ~ByteStreamFileSource();
 
  static void fileReadableHandler(ByteStreamFileSource* source, int mask);
  void doReadFromFile();
 
private:
  // redefined virtual functions:
  virtual void doGetNextFrame();
  virtual void doStopGettingFrames();
 
protected:
  u_int64_t fFileSize;
 
private:
  unsigned fPreferredFrameSize;
  unsigned fPlayTimePerFrame;
  Boolean fFidIsSeekable;
  unsigned fLastPlayTime;
  Boolean fHaveStartedReading;
  Boolean fLimitNumBytesToStream;
  u_int64_t fNumBytesToStream; // used iff "fLimitNumBytesToStream" is True
};
 
#endif