dvbrecorder.cpp

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/*
 *  Class DVBRecorder
 *
 *  Copyright (C) Daniel Thor Kristjansson 2010
 *
 *   This class glues the DVBStreamHandler which handles the DVB devices
 *   to the DTVRecorder that handles recordings in MythTV.
 *
 *   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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 */
 
// MythTV includes
#include "libmythbase/mythlogging.h"
 
#include "dvbchannel.h"
#include "dvbrecorder.h"
#include "dvbstreamhandler.h"
#include "io/mythmediabuffer.h"
#include "mpeg/mpegstreamdata.h"
#include "mpeg/tsstreamdata.h"
#include "tv_rec.h"
 
#define LOC QString("DVBRec[%1](%2): ") \
            .arg(m_tvrec ? m_tvrec->GetInputId() : -1).arg(m_videodevice)
 
DVBRecorder::DVBRecorder(TVRec *rec, DVBChannel *channel)
    : DTVRecorder(rec), m_channel(channel)
{
    m_videodevice.clear();
}
 
bool DVBRecorder::Open(void)
{
    if (IsOpen())
    {
        LOG(VB_GENERAL, LOG_WARNING, LOC + "Card already open");
        return true;
    }
 
    if (m_videodevice.isEmpty())
        return false;
 
    ResetForNewFile();
 
    if (m_channel->GetFormat().compare("MPTS") == 0)
    {
        // MPTS only.  Use TSStreamData to write out unfiltered data
        LOG(VB_RECORD, LOG_INFO, LOC + "Using TSStreamData");
        SetStreamData(new TSStreamData(m_tvrec ? m_tvrec->GetInputId() : -1));
        m_recordMptsOnly = true;
        m_recordMpts = false;
    }
 
    m_streamHandler = DVBStreamHandler::Get(m_videodevice,
                                             m_tvrec ? m_tvrec->GetInputId() : -1);
 
    LOG(VB_RECORD, LOG_INFO, LOC + "Card opened successfully");
 
    return true;
}
 
bool DVBRecorder::IsOpen(void) const
{
    return (nullptr != m_streamHandler);
}
 
void DVBRecorder::Close(void)
{
    LOG(VB_RECORD, LOG_INFO, LOC + "Close() -- begin");
 
    DVBStreamHandler::Return(m_streamHandler, m_tvrec ? m_tvrec->GetInputId() : -1);
 
    LOG(VB_RECORD, LOG_INFO, LOC + "Close() -- end");
}
 
void DVBRecorder::StartNewFile(void)
{
    if (!m_recordMptsOnly)
    {
        if (m_recordMpts)
            m_streamHandler->AddNamedOutputFile(m_ringBuffer->GetFilename());
 
        // Make sure the first things in the file are a PAT & PMT
        HandleSingleProgramPAT(m_streamData->PATSingleProgram(), true);
        HandleSingleProgramPMT(m_streamData->PMTSingleProgram(), true);
    }
}
 
void DVBRecorder::run(void)
{
    if (!Open())
    {
        m_error = "Failed to open DVB device";
        LOG(VB_GENERAL, LOG_ERR, LOC + m_error);
        return;
    }
 
    {
        QMutexLocker locker(&m_pauseLock);
        m_requestRecording = true;
        m_recording = true;
        m_recordingWait.wakeAll();
    }
 
    // Listen for time table on DVB standard streams
    if (m_channel && (m_channel->GetSIStandard() == "dvb"))
        m_streamData->AddListeningPID(PID::DVB_TDT_PID);
    if (m_recordMptsOnly)
        m_streamData->AddListeningPID(0x2000);
 
    StartNewFile();
 
    m_streamData->AddAVListener(this);
    m_streamData->AddWritingListener(this);
    m_streamHandler->AddListener(m_streamData, false, true,
                         (m_recordMpts) ? m_ringBuffer->GetFilename() : QString());
 
    while (IsRecordingRequested() && !IsErrored())
    {
        if (PauseAndWait())
            continue;
 
        {   // sleep 100 milliseconds unless StopRecording() or Unpause()
            // is called, just to avoid running this too often.
            QMutexLocker locker(&m_pauseLock);
            if (!m_requestRecording || m_requestPause)
                continue;
            m_unpauseWait.wait(&m_pauseLock, 100);
        }
 
        if (!m_inputPmt && !m_recordMptsOnly)
        {
            LOG(VB_GENERAL, LOG_WARNING, LOC +
                    "Recording will not commence until a PMT is set.");
            usleep(5000);
            continue;
        }
 
        if (!m_streamHandler->IsRunning())
        {
            m_error = "Stream handler died unexpectedly.";
            LOG(VB_GENERAL, LOG_ERR, LOC + m_error);
        }
    }
 
    m_streamHandler->RemoveListener(m_streamData);
    m_streamData->RemoveWritingListener(this);
    m_streamData->RemoveAVListener(this);
 
    Close();
 
    FinishRecording();
 
    QMutexLocker locker(&m_pauseLock);
    m_recording = false;
    m_recordingWait.wakeAll();
}
 
bool DVBRecorder::PauseAndWait(std::chrono::milliseconds timeout)
{
    QMutexLocker locker(&m_pauseLock);
    if (m_requestPause)
    {
        if (!IsPaused(true))
        {
            m_streamHandler->RemoveListener(m_streamData);
 
            m_paused = true;
            m_pauseWait.wakeAll();
            if (m_tvrec)
                m_tvrec->RecorderPaused();
        }
 
        m_unpauseWait.wait(&m_pauseLock, timeout.count());
    }
 
    if (!m_requestPause && IsPaused(true))
    {
        m_paused = false;
        m_streamHandler->AddListener(m_streamData, false, true);
        m_unpauseWait.wakeAll();
    }
 
    return IsPaused(true);
}
 
QString DVBRecorder::GetSIStandard(void) const
{
    return m_channel->GetSIStandard();
}
 
void DVBRecorder::SetCAMPMT(const ProgramMapTable *pmt)
{
    if (pmt->IsEncrypted(m_channel->GetSIStandard()))
        m_channel->SetPMT(pmt);
}
 
void DVBRecorder::UpdateCAMTimeOffset(void)
{
    m_channel->SetTimeOffset(GetStreamData()->TimeOffset());
}
 
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