pvidfile.h

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/*
 * pvidfile.cxx
 *
 * Video file declaration
 *
 * Portable Windows Library
 *
 * Copyright (C) 2004 Post Increment
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is
 * Craig Southeren <craigs@postincrement.com>
 *
 * All Rights Reserved.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: pvidfile.h,v $
 * Revision 1.6  2007/04/20 06:47:02  csoutheren
 * Really disable video code when video is turned off
 *
 * Revision 1.5  2007/04/13 07:13:13  rjongbloed
 * Major update of video subsystem:
 *   Abstracted video frame info (width, height etc) into separate class.
 *   Changed devices, converter and video file to use above.
 *   Enhanced video file hint detection for frame rate and more
 *     flexible formats.
 *   Fixed issue if need to convert both colour format and size, had to do
 *     colour format first or it didn't convert size.
 *   Win32 video output device can be selected by "MSWIN" alone.
 *
 * Revision 1.4  2006/10/31 04:10:40  csoutheren
 * Make sure PVidFileDev class is loaded, and make it work with OPAL
 *
 * Revision 1.3  2006/02/24 04:51:26  csoutheren
 * Fixed problem with using CIF from video files
 * Added support for video files in y4m format
 *
 * Revision 1.2  2006/02/20 06:49:45  csoutheren
 * Added video file and video file input device code
 *
 * Revision 1.1  2006/02/20 06:17:28  csoutheren
 * Added ability to read video from a file
 *
 */

#ifndef _PVIDFILE
#define _PVIDFILE

#ifdef P_USE_PRAGMA
#pragma interface
#endif

#include <ptlib.h>

#if P_VIDEO
#if P_VIDFILE

#include <ptlib/videoio.h>


class PVideoFile : public PVideoFrameInfo
{
  PCLASSINFO(PVideoFile, PVideoFrameInfo);
  protected:
    PVideoFile();

  public:
    virtual BOOL SetFrameSize(
      unsigned width,   
      unsigned height   
    );

    virtual BOOL Open(
      const PFilePath & name,    // Name of file to open.
      PFile::OpenMode mode = PFile::ReadWrite, // Mode in which to open the file.
      int opts = PFile::ModeDefault     // #OpenOptions enum# for open operation.
    );

    virtual BOOL IsOpen() const { return file.IsOpen(); }
    virtual BOOL Close() { return file.Close(); }

    virtual BOOL WriteFrame(const void * frame);
    virtual BOOL ReadFrame(void * frame);

    virtual off_t GetLength() const;
    virtual BOOL SetLength(
      off_t len   // New length of file in frames.
    );

    virtual off_t GetPosition() const;
    virtual BOOL SetPosition(
      off_t pos,                                       
      PFile::FilePositionOrigin origin = PFile::Start  
    );

    const PFilePath & GetFilePath() const { return file.GetFilePath(); }
    bool IsUnknownFrameSize() const { return unknownFrameSize; }
    PINDEX GetFrameBytes() const { return frameBytes; }

    static BOOL ExtractHints(const PFilePath & fn, PVideoFrameInfo & info);

  protected:
    bool   unknownFrameSize;
    PINDEX frameBytes;
    off_t  headerOffset;
    PFile  file;
};

class PYUVFile : public PVideoFile
{
  PCLASSINFO(PYUVFile, PVideoFile);
  public:
    PYUVFile();

    virtual BOOL Open(
      const PFilePath & name,    // Name of file to open.
      PFile::OpenMode mode = PFile::ReadWrite, // Mode in which to open the file.
      int opts = PFile::ModeDefault     // #OpenOptions enum# for open operation.
    );

    virtual BOOL WriteFrame(const void * frame);
    virtual BOOL ReadFrame(void * frame);

  protected:
    BOOL y4mMode;
};

#endif
#endif

#endif // P_VIDFILE

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