fifo.h

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2004 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card, but now handles other
// hardware as well. These files contain a (mostly) user-space driver 
// for the Unichrome board found on Via's EPIA motherboards.
//
// The information for implementing this driver has been gathered
// from the following sources:
//
// - The DirectFB Unichrome driver
//   Copyright (c) 2003 Andreas Robinson, All rights reserved.
//
// - Andreas Robinson's MPEG-2 decoder for the Unichrome board.
//   Copyright (c) 2003 Andreas Robinson, All rights reserved.
//
// - Via's Unichrome Framebuffer driver
//   Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
//   Copyright 2001-2003 S3 Graphics, Inc. All Rights Reserved.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef DXR3PLAYER_UNICHROME_FIFO_H
#define DXR3PLAYER_UNICHROME_FIFO_H
//------------------------------------------------------------------------------

#include <cstdlib>
#include <inttypes.h>

//------------------------------------------------------------------------------

namespace unichrome {

//------------------------------------------------------------------------------

class IO;

//------------------------------------------------------------------------------

/**
 * The command FIFO of the Unichrome board.
 */
class FIFO
{
public:
    /**
     * The size of the FIFO.
     */
    static const size_t FIFO_SIZE = 4096;

private:
    /**
     * The I/O handler.
     */
    IO& io;

    /**
     * The buffer.
     */
    uint32_t* buffer;

    /**
     * The first unused entry.
     */
    size_t nextIndex;

    /**
     * The number of used and reserved entries.
     */
    size_t numUsed;

public:
    /**
     * Construct the FIFO.
     */
    FIFO(IO& io);

    /**
     * Destroy the FIFO.
     */
    ~FIFO();

    /**
     * Flush the FIFO.
     */
    void flush();

    /**
     * Prepare the FIFO to received the given number of command words.
     */
    void prepare(size_t numWords);

    /**
     * Add a command word for the FIFO.
     */
    void add(uint32_t command);

    /**
     * Add a command header with a parameter.
     */
    void addHeader(uint32_t param);

    /**
     * Add a 2D register setting command to the FIFO.
     */
    void add2D(size_t reg, uint32_t data);

private:
    /**
     * Pad the FIFO to a 8-word boundary.
     */
    void pad();

    /**
     * Wait for the command regulator.
     */
    bool waitCommandRegulator();
};

//------------------------------------------------------------------------------

} /* namespace unichrome */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_UNICHROME_FIFO_H

// Local variables:
// mode: c++
// End: