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v4ldev.h

// -*- c++ -*-

/*
 *
 * Copyright (C) 2002 George Staikos <staikos@kde.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */




#ifndef _V4LDEV_H
#define _V4LDEV_H

#include <qstring.h>
#include <qstringlist.h>
#ifdef __STRICT_ANSI__
#define FOO__STRICT_ANSI__
#undef __STRICT_ANSI__
#endif
#include <asm/types.h>
#ifdef FOO__STRICT_ANSI__
#define __STRICT_ANSI__
#undef FOO__STRICT_ANSI__
#endif
#include <linux/videodev.h>
#include <v4limage.h>

#include <float.h>

struct video_channel;
struct video_mmap;

#define MAX_CLIP_RECTS 128

class V4LDev
{
public:
    virtual ~V4LDev();

    static V4LDev *getDevice( const QString &dev );

    virtual bool isCamera() const;

    virtual bool isTuner() const;

    virtual int startCapture(int x, int y);
    virtual int stopCapture();
    virtual bool overlayOn() const;
    virtual int grab(V4LImage *buff, bool scale = true);
    virtual int signal() const { return -1; }
    virtual int setCaptureGeometry(const QRect& geom);

    // this finds the largest video that is within the size specified.
    // -1 on error, and uses aspect ratio if h = -1
    virtual int setImageSize(int w, int h = -1);

    virtual QString name() const { return _name; }

    virtual int setBrightness(int x);
    virtual int brightness() const;

    virtual int setColour(int x);
    virtual int colour() const;

    virtual int setHue(int x);
    virtual int hue() const;

    virtual int setContrast(int x);
    virtual int contrast() const;

    virtual int setWhiteness(int x);
    virtual int whiteness() const;

    virtual int setColourKey(unsigned long x);
    virtual unsigned long colourKey() const;

    virtual int setSource(const QString &source);
    virtual const QString source() const;
    virtual QStringList sources() const { return _sources; }

    virtual float aspectRatio() const { return _aspectRatio; }

    virtual bool canOverlay() const;
    virtual bool canGrab() const;

    virtual bool hasAudio() const { return _hasAudio; }
    virtual int enableAudio();
    virtual int disableAudio();
    virtual bool audioEnabled() const;

    // Triggers a re-init of the driver to set the new format.  Returns
    // non-zero on error.
    virtual int setInputFormat(int fmt);
    virtual int inputFormat() const;

    virtual void addClip(const QRect& clip);
    virtual void clearClips();
    virtual void reClip();

protected:
    V4LDev(int fd, const QString &name, int channels, int type, int minw, int minh, int maxw, int maxh);

    int initGrabbing();

    int _fd;
    bool _valid;
    QString _name;
    bool _overlaid;
    struct video_channel *_channels;
    int _minWidth, _minHeight, _maxWidth, _maxHeight; // min and max cap dims
    int _type;
    float _aspectRatio;
    int format;
    QStringList _sources;
    int _source;
    int _capW, _capH;          // the scaled capture dimensions
    bool _hasAudio, _isTuner;
    struct video_mmap *_mmapData;
    struct video_mbuf _mbuf;
    int _mmapCurrentFrame;
    uchar *_mmapBuf;
    bool _grabNeedsInit;
    uchar *_grabBuf;
    uchar *_readBuf;
    int _grabW, _grabH;        // the actual capture dimensions
    int _fmt;
    int _bpp;
    QValueList<QRect> _clips;
    struct video_clip _cliprecs[MAX_CLIP_RECTS];
};

#endif

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