spubuffer.cc

来自「Linux下比较早的基于命令行的DVD播放器」· CC 代码 · 共 104 行

//
// Copyright (c) 2003 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

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

#include "SPUBuffer.h"
#include "dvd/demux/Sector.h"

#include <cstdio>

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

using dvd::spu::SPUBuffer;

using dvd::demux::SectorBitReader;

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

size_t SPUBuffer::add(SectorBitReader& reader, size_t length)
{
    assert(!isEmpty() || length>=2);

    size_t totalLength = 
        isEmpty() ? reader.read16() : getLength(data);
    size_t addedNow = 0;

    if (isEmpty()) {
        data = new unsigned char[totalLength];
        data[0] = (totalLength>>8)&0xff;
        data[1] = (totalLength>>0)&0xff;
        length -= 2;
        addedBytes = 2;
        addedNow = 2;
    }

    size_t toAdd = length;
    size_t needToAdd = totalLength - addedBytes;
    if (toAdd>needToAdd) toAdd = needToAdd;

    reader.read(data+addedBytes, toAdd);
    addedBytes += toAdd;
    addedNow += toAdd;
    
    return addedNow;
}

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

size_t SPUBuffer::add(const unsigned char* src, size_t length)
{
    // FIXME: this should be unified with the other add() function
    assert(!isEmpty() || length>=2);

    size_t totalLength;
    if (isEmpty()) {
        totalLength = src[0];
        totalLength <<= 8;
        totalLength |= src[1];
        src += 2;
    } else {
        totalLength =  getLength(data);
    }
    
    size_t addedNow = 0;

    if (isEmpty()) {
        data = new unsigned char[totalLength];
        data[0] = (totalLength>>8)&0xff;
        data[1] = (totalLength>>0)&0xff;
        length -= 2;
        addedBytes = 2;
        addedNow = 2;
    }

    size_t toAdd = length;
    size_t needToAdd = totalLength - addedBytes;
    if (toAdd>needToAdd) toAdd = needToAdd;

    memcpy(data+addedBytes, src, toAdd);
    addedBytes += toAdd;
    addedNow += toAdd;
    
    return addedNow;
}

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