timedstreamhandler.cc

Linux下比较早的基于命令行的DVD播放器

//
// 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 "TimedStreamHandler.h"
#include "Timer.h"

#include "dvd/packet/PacketQueue.h"
#include "dvd/packet/TimedDataBlockPacket.h"

#include "dxr3/Stream.h"

#include "sched/Scheduler.h"

#include "util/Log.h"

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

using output::dxr3::TimedStreamHandler;
using output::dxr3::Timer;

using dvd::packet::PacketQueue;
using dvd::packet::TimedDataBlockPacket;

using dxr3::TimedStream;

using sched::Scheduler;

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

TimedStreamHandler::TimedStreamHandler(const char* name,
                                       Timer& timer,
                                       PacketQueue& inputQueue, 
                                       TimedStream& timedStream,
                                       size_t burstSize) :
    Schedulable(name, defaultStackSize, burstSize),
    inputQueue(inputQueue),
    timer(timer),
    timedStream(timedStream),
    streamWritable(name, "streamWritable", timedStream)
{
}

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

void TimedStreamHandler::run()
{
    while(!shouldQuit()) {
        clearInterrupt();

        Reference<TimedDataBlockPacket> packet = 
            TimedDataBlockPacket::convert(inputQueue.get());

        if (packet.isValid()) write(packet);
        
        if (!isInterrupted()) {
            Scheduler::continueBurst("output::dxr3::TimedStreamHandler::run");
        }
    }
}

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

void TimedStreamHandler::reset()
{
    interrupt();
}

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

void TimedStreamHandler::write(Reference<TimedDataBlockPacket> packet)
{
    write(packet->getData(), packet->getLength(), packet->getPTS());
}

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

void TimedStreamHandler::write(const unsigned char* data, size_t length,
                               pts_t pts)
{
    if (pts!=INVALID_PTS) {
        pts_t currentSCR = timer.getCurrentSCR();
        pts_t streamPTS = pts + timer.getPTSCompensation();

        if ( streamPTS < (currentSCR + 7200) ) {
            // FIXME: constants again
            ptsdiff_t diff = currentSCR + 7200 - streamPTS;
            timer.advancePTSCompensation(diff);
            streamPTS += diff;
            Log::debug("output::dxr3::TimedStreamHandler::write: advanced PTS compensation by: %lld\n",
                       diff);
        }

        timedStream.setPTS(streamPTS);
    }

    size_t offset = 0;
    while(!isInterrupted() && offset<length) {
        size_t written = 
            timedStream.write(data + offset, length - offset);

        if (written==0) {
            Scheduler::waitInterruptible(streamWritable);
        } else {
            offset += written;
        }
    }
}

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