util.h

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2002 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card.

// 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_UTIL_H
#define DXR3PLAYER_UTIL_H
//------------------------------------------------------------------------------

#include "types.h"

#include <cstdio>
#include <inttypes.h>

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

/**
 * Various utility functions.
 */
class Util
{
public:
    /**
     * The PTS frequency.
     */
    static const size_t ptsFrequency = 90000;

    /**
     * Get the current time in milliseconds since the epoch.
     */
    static millis_t currentTimeMillis();

    /**
     * Read a valid (non-comment) line into the given buffer.
     */
    static bool readLine(char* buffer, size_t length, FILE* file);

    /**
     * Get the language code for the given 2-letter code.
     */
    static unsigned getLanguageCode(const char* language);

    /**
     * Convert to 16-bit values into a 32-bit one.
     */
    static uint32_t combine32(unsigned low, unsigned high);

    /**
     * Create the given directory if necessary. Its parents will be
     * created as well, if needed.
     *
     * @return if the directory could be created or already exists
     */
    static bool makeDirectory(const char* path);

    /**
     * Convert the given 2-digit BCD number into an unsigned.
     */
    static unsigned bcd2Unsigned(uint8_t x);
};

//------------------------------------------------------------------------------
// Macros
//------------------------------------------------------------------------------

#define millis2PTS(x) ((x) * (Util::ptsFrequency / 1000))

//------------------------------------------------------------------------------
// Inline definitions
//------------------------------------------------------------------------------

inline uint32_t Util::combine32(unsigned low, unsigned high)
{
    return (low&0xffff) | ((high&0xffff)<<16);
}

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

inline unsigned Util::bcd2Unsigned(uint8_t x)
{
    return 
        ((x>>4)&0x0f)*10 + ((x>>0)&0x0f);
}

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_UTIL_H

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