dtvrecorder.cpp

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#include "libmythbase/mythcorecontext.h"
#include "libmythbase/mythlogging.h"
#include "libmythbase/programinfo.h"
#include "libmythbase/sizetliteral.h"
 
#include "bytereader.h"
#include "dtvrecorder.h"
#include "io/mythmediabuffer.h"
#include "mpeg/AVCParser.h"
#include "mpeg/HEVCParser.h"
#include "mpeg/atscstreamdata.h"
#include "mpeg/dvbstreamdata.h"
#include "mpeg/mpegstreamdata.h"
#include "mpeg/mpegtables.h"
#include "mythsystemevent.h"
#include "tv_rec.h"
 
#define LOC ((m_tvrec) ? \
    QString("DTVRec[%1]: ").arg(m_tvrec->GetInputId()) : \
    QString("DTVRec(0x%1): ").arg(intptr_t(this),0,16))
 
const uint DTVRecorder::kMaxKeyFrameDistance = 80;
 
DTVRecorder::DTVRecorder(TVRec *rec) :
    RecorderBase(rec),
    m_h2645Parser(reinterpret_cast<H2645Parser *>(new AVCParser))
{
    SetPositionMapType(MARK_GOP_BYFRAME);
    m_payloadBuffer.reserve(TSPacket::kSize * (50_UZ + 1));
 
    DTVRecorder::ResetForNewFile();
 
    m_minimumRecordingQuality =
        gCoreContext->GetNumSetting("MinimumRecordingQuality", 95);
 
    m_containerFormat = formatMPEG2_TS;
}
 
DTVRecorder::~DTVRecorder(void)
{
    StopRecording();
 
    DTVRecorder::SetStreamData(nullptr);
 
    if (m_inputPat)
    {
        delete m_inputPat;
        m_inputPat = nullptr;
    }
 
    if (m_inputPmt)
    {
        delete m_inputPmt;
        m_inputPmt = nullptr;
    }
 
    if (m_h2645Parser)
    {
        delete m_h2645Parser;
        m_h2645Parser = nullptr;
    }
}
 
void DTVRecorder::SetOption(const QString &name, const QString &value)
{
    if (name == "recordingtype")
        m_recordingType = value;
    else
        RecorderBase::SetOption(name, value);
}
 
void DTVRecorder::SetOption(const QString &name, int value)
{
    if (name == "wait_for_seqstart")
        m_waitForKeyframeOption = (value == 1);
    else if (name == "recordmpts")
        m_recordMpts = (value != 0);
    else
        RecorderBase::SetOption(name, value);
}
 
void DTVRecorder::SetOptionsFromProfile(RecordingProfile *profile,
                                        const QString &videodev,
                                        const QString& /*audiodev*/, const QString& /*vbidev*/)
{
    SetOption("videodevice", videodev);
    DTVRecorder::SetOption("tvformat", gCoreContext->GetSetting("TVFormat"));
    SetStrOption(profile, "recordingtype");
    SetIntOption(profile, "recordmpts");
}
 
void DTVRecorder::FinishRecording(void)
{
    if (m_ringBuffer)
        m_ringBuffer->WriterFlush();
 
    if (m_curRecording)
    {
        SetDuration(millisecondsFromFloat(m_totalDuration * 1000));
        SetTotalFrames(m_framesWrittenCount);
    }
 
    RecorderBase::FinishRecording();
}
 
void DTVRecorder::ResetForNewFile(void)
{
    LOG(VB_RECORD, LOG_INFO, LOC + "ResetForNewFile(void)");
    QMutexLocker locker(&m_positionMapLock);
 
    // m_seen_psp and m_h2645_parser should
    // not be reset here. This will only be called just as
    // we're seeing the first packet of a new keyframe for
    // writing to the new file and anything that makes the
    // recorder think we're waiting on another keyframe will
    // send significant amounts of good data to /dev/null.
    // -- Daniel Kristjansson 2011-02-26
 
    m_startCode                  = 0xffffffff;
    m_firstKeyframe              = -1;
    m_hasWrittenOtherKeyframe    = false;
    m_lastKeyframeSeen           = 0;
    m_lastGopSeen                = 0;
    m_lastSeqSeen                = 0;
    m_audioBytesRemaining        = 0;
    m_videoBytesRemaining        = 0;
    m_otherBytesRemaining        = 0;
    //_recording
    m_error                      = QString();
 
    m_progressiveSequence        = 0;
    m_repeatPict                 = 0;
 
    //m_pes_synced
    //m_seen_sps
    m_positionMap.clear();
    m_positionMapDelta.clear();
    m_durationMap.clear();
    m_durationMapDelta.clear();
 
    m_primaryVideoCodec = AV_CODEC_ID_NONE;
    m_primaryAudioCodec = AV_CODEC_ID_NONE;
 
    m_continuityCounter.fill(0xff);
 
    locker.unlock();
    DTVRecorder::ClearStatistics();
}
 
void DTVRecorder::ClearStatistics(void)
{
    RecorderBase::ClearStatistics();
 
    m_tsCount.fill(0);
    m_tsLast.fill(-1LL);
    m_tsFirst.fill(-1LL);
    //m_tsFirst_dt -- doesn't need to be cleared only used if m_tsFirst>=0
    m_packetCount.fetchAndStoreRelaxed(0);
    m_continuityErrorCount.fetchAndStoreRelaxed(0);
    m_framesSeenCount            = 0;
    m_framesWrittenCount         = 0;
    m_totalDuration              = 0;
    m_tdBase                     = 0;
    m_tdTickCount                = 0;
    m_tdTickFramerate            = MythAVRational(0);
 
}
 
// documented in recorderbase.h
void DTVRecorder::Reset(void)
{
    LOG(VB_RECORD, LOG_INFO, LOC + "Reset(void)");
    ResetForNewFile();
 
    m_startCode = 0xffffffff;
 
    if (m_curRecording)
    {
        m_curRecording->ClearPositionMap(MARK_GOP_BYFRAME);
        m_curRecording->ClearPositionMap(MARK_DURATION_MS);
    }
}
 
void DTVRecorder::SetStreamData(MPEGStreamData *data)
{
    if (data == m_streamData)
        return;
 
    MPEGStreamData *old_data = m_streamData;
    m_streamData = data;
    delete old_data;
 
    if (m_streamData)
        InitStreamData();
}
 
void DTVRecorder::InitStreamData(void)
{
    if (m_streamData == nullptr)
        return;
 
    m_streamData->AddMPEGSPListener(this);
    m_streamData->AddMPEGListener(this);
 
    auto *dvb = dynamic_cast<DVBStreamData*>(m_streamData);
    if (dvb)
        dvb->AddDVBMainListener(this);
 
    auto *atsc = dynamic_cast<ATSCStreamData*>(m_streamData);
 
    if (atsc && atsc->DesiredMinorChannel())
    {
        atsc->SetDesiredChannel(atsc->DesiredMajorChannel(),
                                atsc->DesiredMinorChannel());
    }
    // clang-tidy assumes that if the result of dynamic_cast is
    // nullptr that the thing being casted must also be a nullptr.
    // NOLINTNEXTLINE(clang-analyzer-core.CallAndMessage)
    else if (m_streamData->DesiredProgram() >= 0)
    {
        m_streamData->SetDesiredProgram(m_streamData->DesiredProgram());
    }
}
 
void DTVRecorder::BufferedWrite(const TSPacket &tspacket, bool insert)
{
    if (!insert) // PAT/PMT may need inserted in front of any buffered data
    {
        // delay until first GOP to avoid decoder crash on res change
        if (!m_bufferPackets && m_waitForKeyframeOption &&
            m_firstKeyframe < 0)
            return;
 
        if (m_curRecording && m_timeOfFirstDataIsSet.testAndSetRelaxed(0,1))
        {
            QMutexLocker locker(&m_statisticsLock);
            m_timeOfFirstData = MythDate::current();
            m_timeOfLatestData = MythDate::current();
            m_timeOfLatestDataTimer.start();
        }
 
        int val = m_timeOfLatestDataCount.fetchAndAddRelaxed(1);
        int thresh = m_timeOfLatestDataPacketInterval.fetchAndAddRelaxed(0);
        if (val > thresh)
        {
            QMutexLocker locker(&m_statisticsLock);
            std::chrono::milliseconds elapsed = m_timeOfLatestDataTimer.restart();
            int interval = thresh;
            if (elapsed > kTimeOfLatestDataIntervalTarget + 250ms)
            {
                interval = m_timeOfLatestDataPacketInterval
                           .fetchAndStoreRelaxed(thresh * 4 / 5);
            }
            else if (elapsed + 250ms < kTimeOfLatestDataIntervalTarget)
            {
                interval = m_timeOfLatestDataPacketInterval
                           .fetchAndStoreRelaxed(thresh * 9 / 8);
            }
 
            m_timeOfLatestDataCount.fetchAndStoreRelaxed(1);
            m_timeOfLatestData = MythDate::current();
 
            LOG(VB_RECORD, LOG_DEBUG, LOC +
                QString("Updating timeOfLatestData elapsed(%1) interval(%2)")
                .arg(elapsed.count()).arg(interval));
        }
 
        // Do we have to buffer the packet for exact keyframe detection?
        if (m_bufferPackets)
        {
            int idx = m_payloadBuffer.size();
            m_payloadBuffer.resize(idx + TSPacket::kSize);
            memcpy(&m_payloadBuffer[idx], tspacket.data(), TSPacket::kSize);
            return;
        }
 
        // We are free to write the packet, but if we have buffered packet[s]
        // we have to write them first...
        if (!m_payloadBuffer.empty())
        {
            if (m_ringBuffer)
                m_ringBuffer->Write((m_payloadBuffer).data(), m_payloadBuffer.size());
            m_payloadBuffer.clear();
        }
    }
 
    if (m_ringBuffer && m_ringBuffer->Write(tspacket.data(), TSPacket::kSize) < 0 &&
        m_curRecording && m_curRecording->GetRecordingStatus() != RecStatus::Failing)
    {
        LOG(VB_GENERAL, LOG_INFO, LOC +
            QString("BufferedWrite: Writes are failing, "
                    "setting status to %1")
            .arg(RecStatus::toString(RecStatus::Failing, kSingleRecord)));
        SetRecordingStatus(RecStatus::Failing, __FILE__, __LINE__);
    }
}
 
enum : std::uint8_t { kExtractPTS, kExtractDTS };
static int64_t extract_timestamp(
    const uint8_t *bufptr, int bytes_left, int pts_or_dts)
{
    if (bytes_left < 4)
        return -1LL;
 
    bool has_pts = (bufptr[3] & 0x80) != 0;
    int offset = 5;
    if (((kExtractPTS == pts_or_dts) && !has_pts) || (offset + 5 > bytes_left))
        return -1LL;
 
    bool has_dts = (bufptr[3] & 0x40) != 0;
    if (kExtractDTS == pts_or_dts)
    {
        if (!has_dts)
            return -1LL;
        offset += has_pts ? 5 : 0;
        if (offset + 5 > bytes_left)
            return -1LL;
    }
 
    return ((uint64_t(bufptr[offset+0] & 0x0e) << 29) |
            (uint64_t(bufptr[offset+1]       ) << 22) |
            (uint64_t(bufptr[offset+2] & 0xfe) << 14) |
            (uint64_t(bufptr[offset+3]       ) <<  7) |
            (uint64_t(bufptr[offset+4] & 0xfe) >>  1));
}
 
static QDateTime ts_to_qdatetime(
    uint64_t pts, uint64_t pts_first, const QDateTime &pts_first_dt)
{
    if (pts < pts_first)
        pts += 0x1FFFFFFFFLL;
    const QDateTime& dt = pts_first_dt;
    return dt.addMSecs((pts - pts_first)/90);
}
 
static const std::array<const MythAVRational,16> frameRateMap = {
    MythAVRational(0),  MythAVRational(24000, 1001), MythAVRational(24),
    MythAVRational(25), MythAVRational(30000, 1001), MythAVRational(30),
    MythAVRational(50), MythAVRational(60000, 1001), MythAVRational(60),
    MythAVRational(0),  MythAVRational(0),           MythAVRational(0),
    MythAVRational(0),  MythAVRational(0),           MythAVRational(0),
    MythAVRational(0)
};
 
bool DTVRecorder::FindMPEG2Keyframes(const TSPacket* tspacket)
{
    if (!tspacket->HasPayload()) // no payload to scan
        return m_firstKeyframe >= 0;
 
    if (!m_ringBuffer)
        return m_firstKeyframe >= 0;
 
    // if packet contains start of PES packet, start
    // looking for first byte of MPEG start code (3 bytes 0 0 1)
    // otherwise, pick up search where we left off.
    const bool payloadStart = tspacket->PayloadStart();
    m_startCode = (payloadStart) ? 0xffffffff : m_startCode;
 
    // Just make these local for efficiency reasons (gcc not so smart..)
    const uint maxKFD = kMaxKeyFrameDistance;
    bool hasFrame     = false;
    bool hasKeyFrame  = false;
 
    uint aspectRatio = 0;
    uint height = 0;
    uint width = 0;
    MythAVRational frameRate {0};
 
    // Scan for PES header codes; specifically picture_start
    // sequence_start (SEQ) and group_start (GOP).
    //   00 00 01 00: picture_start_code
    //   00 00 01 B8: group_start_code
    //   00 00 01 B3: seq_start_code
    //   00 00 01 B5: ext_start_code
    //   (there are others that we don't care about)
    const uint8_t *bufptr = tspacket->data() + tspacket->AFCOffset();
    const uint8_t *bufend = tspacket->data() + TSPacket::kSize;
    m_repeatPict = 0;
 
    while (bufptr < bufend)
    {
        bufptr = ByteReader::find_start_code_truncated(bufptr, bufend, &m_startCode);
        int bytes_left = bufend - bufptr;
        if (ByteReader::start_code_is_valid(m_startCode))
        {
            // At this point we have seen the start code 0 0 1
            // the next byte will be the PES packet stream id.
            const int stream_id = m_startCode & 0x000000ff;
            if (PESStreamID::PictureStartCode == stream_id)
            {
                if (m_progressiveSequence)
                {
                    hasFrame = true;
                }
                // else deterimine hasFrame from the following picture_coding_extension()
            }
            else if (PESStreamID::GOPStartCode == stream_id)
            {
                m_lastGopSeen   = m_framesSeenCount;
                hasKeyFrame     = true;
            }
            else if (PESStreamID::SequenceStartCode == stream_id)
            {
                m_lastSeqSeen   = m_framesSeenCount;
                hasKeyFrame    |= (m_lastGopSeen + maxKFD)<m_framesSeenCount;
 
                // Look for aspectRatio changes and store them in the database
                aspectRatio = (bufptr[3] >> 4);
 
                // Get resolution
                height = ((bufptr[1] & 0xf) << 8) | bufptr[2];
                width = (bufptr[0] <<4) | (bufptr[1]>>4);
 
                frameRate = frameRateMap[(bufptr[3] & 0x0000000f)];
            }
            else if (PESStreamID::MPEG2ExtensionStartCode == stream_id)
            {
                if (bytes_left >= 1)
                {
                    int ext_type = (bufptr[0] >> 4);
                    switch(ext_type)
                    {
                    case 0x1: /* sequence extension */
                        if (bytes_left >= 6)
                        {
                            m_progressiveSequence = bufptr[1] & (1 << 3);
                        }
                        break;
                    case 0x8: /* picture coding extension */
                        if (bytes_left >= 5)
                        {
                            int picture_structure  = bufptr[2] & 3;
                            int top_field_first = bufptr[3] & (1 << 7);
                            int repeat_first_field = bufptr[3] & (1 << 1);
                            int progressive_frame = bufptr[4] & (1 << 7);
#if 0
                            LOG(VB_RECORD, LOG_DEBUG, LOC +
                                QString("picture_coding_extension(): (m_progressiveSequence: %1) picture_structure: %2 top_field_first: %3 repeat_first_field: %4 progressive_frame: %5")
                                    .arg(QString::number(m_progressiveSequence , 2),
                                         QString::number(picture_structure , 2),
                                         QString::number(top_field_first , 2),
                                         QString::number(repeat_first_field , 2),
                                         QString::number(progressive_frame , 2)
                                        )
                               );
#endif
                            if (!m_progressiveSequence)
                            {
                                if (picture_structure == 0b00)
                                {
                                    ; // reserved
                                }
                                else if (picture_structure == 0b11)
                                {
                                    // frame picture (either interleaved interlaced or progressive)
                                    hasFrame = true;
                                }
                                else if (picture_structure < 0b11)
                                {
                                    // field picture
                                    // Only add a frame for the first presented field.
                                    // Do not add a frame for each field picture.
                                    if (top_field_first != 0)
                                    {
                                        hasFrame = (picture_structure == 0b01); // Top Field
                                    }
                                    else // top_field_first == 0
                                    {
                                        hasFrame = (picture_structure == 0b10); // Bottom Field
                                    }
                                }
                            }
 
                            /* check if we must repeat the frame */
                            m_repeatPict = 1;
                            if (repeat_first_field)
                            {
                                if (m_progressiveSequence)
                                {
                                    if (top_field_first)
                                        m_repeatPict = 5;
                                    else
                                        m_repeatPict = 3;
                                }
                                else if (progressive_frame)
                                {
                                    m_repeatPict = 2;
                                }
                            }
                            // The m_repeatPict code above matches
                            // mpegvideo_extract_headers(), but the
                            // code in mpeg_field_start() computes a
                            // value one less, which seems correct.
                            --m_repeatPict;
                        }
                        break;
                    }
                }
            }
            if ((stream_id >= PESStreamID::MPEGVideoStreamBegin) &&
                (stream_id <= PESStreamID::MPEGVideoStreamEnd))
            {
                int64_t pts = extract_timestamp(
                    bufptr, bytes_left, kExtractPTS);
                int64_t dts = extract_timestamp(
                    bufptr, bytes_left, kExtractPTS);
                HandleTimestamps(stream_id, pts, dts);
                // Detect music choice program (very slow frame rate and audio)
                if (m_firstKeyframe < 0
                    &&  m_tsLast[stream_id] - m_tsFirst[stream_id] > 3*90000LL)
                {
                    hasKeyFrame = true;
                    m_musicChoice = true;
                    LOG(VB_GENERAL, LOG_INFO, LOC + "Music Choice program detected");
                }
            }
        }
    }
 
    if (hasFrame && !hasKeyFrame)
    {
        // If we have seen kMaxKeyFrameDistance frames since the
        // last GOP or SEQ stream_id, then pretend this picture
        // is a keyframe. We may get artifacts but at least
        // we will be able to skip frames.
        hasKeyFrame = ((m_framesSeenCount & 0xf) == 0U);
        hasKeyFrame &= (m_lastGopSeen + maxKFD) < m_framesSeenCount;
        hasKeyFrame &= (m_lastSeqSeen + maxKFD) < m_framesSeenCount;
    }
 
    // m_bufferPackets will only be true if a payload start has been seen
    if (hasKeyFrame && (m_bufferPackets || m_firstKeyframe >= 0))
    {
        LOG(VB_RECORD, LOG_DEBUG, LOC + QString
            ("Keyframe @ %1 + %2 = %3")
            .arg(m_ringBuffer->GetWritePosition())
            .arg(m_payloadBuffer.size())
            .arg(m_ringBuffer->GetWritePosition() + m_payloadBuffer.size()));
 
        m_lastKeyframeSeen = m_framesSeenCount;
        HandleKeyframe(0);
    }
 
    if (hasFrame)
    {
        LOG(VB_RECORD, LOG_DEBUG, LOC + QString
            ("Frame @ %1 + %2 = %3")
            .arg(m_ringBuffer->GetWritePosition())
            .arg(m_payloadBuffer.size())
            .arg(m_ringBuffer->GetWritePosition() + m_payloadBuffer.size()));
 
        m_bufferPackets = false;  // We now know if it is a keyframe, or not
        m_framesSeenCount++;
        if (!m_waitForKeyframeOption || m_firstKeyframe >= 0)
            UpdateFramesWritten();
        else
        {
            /* Found a frame that is not a keyframe, and we want to
             * start on a keyframe */
            m_payloadBuffer.clear();
        }
    }
 
    if ((aspectRatio > 0) && (aspectRatio != m_videoAspect))
    {
        m_videoAspect = aspectRatio;
        AspectChange((AspectRatio)aspectRatio, m_framesWrittenCount);
    }
 
    if (height && width && (height != m_videoHeight || m_videoWidth != width))
    {
        m_videoHeight = height;
        m_videoWidth = width;
        ResolutionChange(width, height, m_framesWrittenCount);
    }
 
    if (frameRate.isNonzero() && frameRate != m_frameRate)
    {
        m_frameRate = frameRate;
        LOG(VB_RECORD, LOG_INFO, LOC +
            QString("FindMPEG2Keyframes: frame rate = %1")
            .arg(frameRate.toDouble() * 1000));
        FrameRateChange(frameRate.toDouble() * 1000, m_framesWrittenCount);
    }
 
    return m_firstKeyframe >= 0;
}
 
void DTVRecorder::HandleTimestamps(int stream_id, int64_t pts, int64_t dts)
{
    if (pts < 0)
    {
        m_tsLast[stream_id] = -1;
        return;
    }
 
    if ((dts < 0) && !m_usePts)
    {
        m_tsLast[stream_id] = -1;
        m_usePts = true;
        LOG(VB_RECORD, LOG_DEBUG,
            "Switching from dts tracking to pts tracking." +
            QString("TS count is %1").arg(m_tsCount[stream_id]));
    }
 
    int64_t ts = dts;
    int64_t gap_threshold = 90000; // 1 second
    if (m_usePts)
    {
        ts = dts;
        gap_threshold = 2*90000LL; // two seconds, compensate for GOP ordering
    }
 
    if (m_musicChoice)
        gap_threshold = 8*90000LL; // music choice uses frames every 6 seconds
 
    if (m_tsLast[stream_id] >= 0)
    {
        int64_t diff = ts - m_tsLast[stream_id];
 
        // time jumped back more then 10 seconds, handle it as 33bit overflow
        if (diff < (10 * -90000LL))
            // MAX_PTS is 33bits all 1
            diff += 0x1ffffffffLL;
 
        // FIXME why do we handle negative gaps (aka overlap) like a gap?
        if (diff < 0)
            diff = -diff;
 
        if (diff > gap_threshold && m_firstKeyframe >= 0)
        {
            QMutexLocker locker(&m_statisticsLock);
 
            m_recordingGaps.push_back(
                RecordingGap(
                    ts_to_qdatetime(
                        m_tsLast[stream_id], m_tsFirst[stream_id],
                        m_tsFirstDt[stream_id]),
                    ts_to_qdatetime(
                        ts, m_tsFirst[stream_id], m_tsFirstDt[stream_id])));
            LOG(VB_RECORD, LOG_DEBUG, LOC + QString("Inserted gap %1 dur %2")
                .arg(m_recordingGaps.back().toString()).arg(diff/90000.0));
 
            if (m_curRecording && m_curRecording->GetRecordingStatus() != RecStatus::Failing)
            {
                RecordingQuality recq(m_curRecording, m_recordingGaps);
                if (recq.IsDamaged())
                {
                    LOG(VB_GENERAL, LOG_INFO, LOC +
                        QString("HandleTimestamps: too much damage, "
                                "setting status to %1")
                        .arg(RecStatus::toString(RecStatus::Failing, kSingleRecord)));
                    SetRecordingStatus(RecStatus::Failing, __FILE__, __LINE__);
                }
            }
        }
    }
 
    m_tsLast[stream_id] = ts;
 
    if (m_tsCount[stream_id] < 30)
    {
        if (!m_tsCount[stream_id] || (ts < m_tsFirst[stream_id]))
        {
            m_tsFirst[stream_id] = ts;
            m_tsFirstDt[stream_id] = MythDate::current();
        }
    }
 
    m_tsCount[stream_id]++;
}
 
void DTVRecorder::UpdateFramesWritten(void)
{
    m_framesWrittenCount++;
    if (!m_tdTickFramerate.isNonzero())
        m_tdTickFramerate = m_frameRate;
    if (m_tdTickFramerate != m_frameRate)
    {
        m_tdBase = m_totalDuration;
        m_tdTickCount = 0;
        m_tdTickFramerate = m_frameRate;
    }
    m_tdTickCount += (2 + m_repeatPict);
    if (m_tdTickFramerate.isNonzero())
    {
        // not 1000 since m_tdTickCount needs to be divided by 2 to get an equivalent frame count
        m_totalDuration = m_tdBase + ((int64_t) 500 * m_tdTickCount *
            m_tdTickFramerate.invert().toDouble());
    }
 
    if (m_framesWrittenCount < 2000 || m_framesWrittenCount % 1000 == 0)
    {
        LOG(VB_RECORD, LOG_DEBUG,
            QString("count=%1 m_frameRate=%2 tick_frameRate=%3 "
                    "tick_cnt=%4 tick_base=%5 _total_dur=%6")
            .arg(m_framesWrittenCount)
            .arg(m_frameRate.toString(),
                 m_tdTickFramerate.toString())
            .arg(m_tdTickCount)
            .arg(m_tdBase)
            .arg(m_totalDuration));
    }
}
 
bool DTVRecorder::FindAudioKeyframes(const TSPacket* /*tspacket*/)
{
    bool hasKeyFrame = false;
    if (!m_ringBuffer || (GetStreamData()->VideoPIDSingleProgram() <= 0x1fff))
        return hasKeyFrame;
 
    static constexpr uint64_t kMsecPerDay { 24ULL * 60 * 60 * 1000 };
    const double frame_interval = (1000.0 / m_videoFrameRate);
    uint64_t elapsed = 0;
    if (m_audioTimer.isValid())
        elapsed = m_audioTimer.elapsed();
    auto expected_frame = (uint64_t) ((double)elapsed / frame_interval);
 
    while (m_framesSeenCount > expected_frame + 10000)
        expected_frame += (uint64_t) ((double)kMsecPerDay / frame_interval);
 
    if (!m_framesSeenCount || (m_framesSeenCount < expected_frame))
    {
        if (!m_framesSeenCount)
            m_audioTimer.start();
 
        m_bufferPackets = false;
        m_framesSeenCount++;
 
        if (1 == (m_framesSeenCount & 0x7))
        {
            m_lastKeyframeSeen = m_framesSeenCount;
            HandleKeyframe(m_payloadBuffer.size());
            hasKeyFrame = true;
        }
 
        if (!m_waitForKeyframeOption || m_firstKeyframe>=0)
            UpdateFramesWritten();
    }
 
    return hasKeyFrame;
}
 
bool DTVRecorder::FindOtherKeyframes(const TSPacket */*tspacket*/)
{
    if (!m_ringBuffer || (GetStreamData()->VideoPIDSingleProgram() <= 0x1fff))
        return true;
 
    if (m_hasWrittenOtherKeyframe)
        return true;
 
    LOG(VB_RECORD, LOG_INFO, LOC + "DSMCC - FindOtherKeyframes() - "
            "generating initial key-frame");
 
    m_framesSeenCount++;
    UpdateFramesWritten();
    m_lastKeyframeSeen = m_framesSeenCount;
 
    HandleKeyframe(m_payloadBuffer.size());
 
    m_hasWrittenOtherKeyframe = true;
 
    return true;
}
 
void DTVRecorder::HandleKeyframe(int64_t extra)
{
    if (!m_ringBuffer)
        return;
 
    // Perform ringbuffer switch if needed.
    CheckForRingBufferSwitch();
 
    uint64_t frameNum = m_framesWrittenCount;
    if (m_firstKeyframe < 0)
    {
        m_firstKeyframe = frameNum;
        SendMythSystemRecEvent("REC_STARTED_WRITING", m_curRecording);
    }
 
    // Add key frame to position map
    m_positionMapLock.lock();
    if (!m_positionMap.contains(frameNum))
    {
        int64_t startpos = m_ringBuffer->GetWritePosition() + extra;
 
        // Don't put negative offsets into the database, they get munged into
        // MAX_INT64 - offset, which is an exceedingly large number, and
        // certainly not valid.
        if (startpos >= 0)
        {
            m_positionMapDelta[frameNum] = startpos;
            m_positionMap[frameNum]      = startpos;
            m_durationMap[frameNum]      = llround(m_totalDuration);
            m_durationMapDelta[frameNum] = llround(m_totalDuration);
        }
    }
    m_positionMapLock.unlock();
}
 
bool DTVRecorder::FindH2645Keyframes(const TSPacket *tspacket)
{
    if (!tspacket->HasPayload()) // no payload to scan
        return m_firstKeyframe >= 0;
 
    if (!m_ringBuffer)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "FindH2645Keyframes: No ringbuffer");
        return m_firstKeyframe >= 0;
    }
 
    if (!m_h2645Parser)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "FindH2645Keyframes: m_h2645Parser not present");
        return m_firstKeyframe >= 0;
    }
 
    const bool payloadStart = tspacket->PayloadStart();
    if (payloadStart)
    {
        // reset PES sync state
        m_pesSynced = false;
        m_startCode = 0xffffffff;
    }
 
    uint aspectRatio = 0;
    uint height = 0;
    uint width = 0;
    MythAVRational frameRate {0};
    SCAN_t scantype(SCAN_t::UNKNOWN_SCAN);
 
    bool hasFrame = false;
    bool hasKeyFrame = false;
 
    // scan for PES packets and H.264 NAL units
    uint i = tspacket->AFCOffset();
    for (; i < TSPacket::kSize; ++i)
    {
        // special handling required when a new PES packet begins
        if (payloadStart && !m_pesSynced)
        {
            // bounds check
            if (i + 2 >= TSPacket::kSize)
            {
                LOG(VB_GENERAL, LOG_ERR, LOC +
                    "PES packet start code may overflow to next TS packet, "
                    "aborting keyframe search");
                break;
            }
 
            // must find the PES start code
            if (tspacket->data()[i  ] != 0x00 ||
                tspacket->data()[i+1] != 0x00 ||
                tspacket->data()[i+2] != 0x01)
            {
                if (!m_pesTimer.isRunning() || m_pesTimer.elapsed() > 20000ms)
                {
                    m_pesTimer.restart();
                    LOG(VB_GENERAL, LOG_ERR, LOC +
                        "PES start code not found in TS packet with PUSI set");
                }
                break;
            }
            i += 3;
 
            m_pesTimer.stop();
 
            // bounds check
            if (i + 5 >= TSPacket::kSize)
            {
                LOG(VB_GENERAL, LOG_ERR, LOC +
                    "PES packet headers overflow to next TS packet, "
                    "aborting keyframe search");
                break;
            }
 
            // now we need to compute where the PES payload begins
            // skip past the stream_id (+1)
            // the next two bytes are the PES packet length (+2)
            // after that, one byte of PES packet control bits (+1)
            // after that, one byte of PES header flags bits (+1)
            // and finally, one byte for the PES header length
            const unsigned char pes_header_length = tspacket->data()[i + 5];
 
            // bounds check
            if ((i + 6 + pes_header_length) >= TSPacket::kSize)
            {
                LOG(VB_GENERAL, LOG_ERR, LOC +
                    "PES packet headers overflow to next TS packet, "
                    "aborting keyframe search");
                break;
            }
 
            // we now know where the PES payload is
            // normally, we should have used 6, but use 5 because the for
            // loop will bump i
            i += 5 + pes_header_length;
            m_pesSynced = true;
 
#if 0
            LOG(VB_RECORD, LOG_DEBUG, LOC + "PES synced");
#endif
            continue;
        }
 
        if (!m_pesSynced)
            break;
 
        // scan the NAL units
        uint32_t bytes_used = m_h2645Parser->addBytes
                              (tspacket->data() + i, TSPacket::kSize - i,
                               m_ringBuffer->GetWritePosition());
        i += (bytes_used - 1);
 
        if (m_h2645Parser->stateChanged())
        {
            if (m_h2645Parser->onFrameStart() &&
                m_h2645Parser->getFieldType() != H2645Parser::FIELD_BOTTOM)
            {
                hasKeyFrame = m_h2645Parser->onKeyFrameStart();
                hasFrame = true;
                m_seenSps |= hasKeyFrame;
 
                width = m_h2645Parser->pictureWidth();
                height = m_h2645Parser->pictureHeight();
                aspectRatio = m_h2645Parser->aspectRatio();
                scantype = m_h2645Parser->GetScanType();
                frameRate   = m_h2645Parser->getFrameRate();
            }
        }
    } // for (; i < TSPacket::kSize; ++i)
 
    // If it has been more than 511 frames since the last keyframe,
    // pretend we have one.
    if (hasFrame && !hasKeyFrame &&
        (m_framesSeenCount - m_lastKeyframeSeen) > 511)
    {
        hasKeyFrame = true;
        LOG(VB_RECORD, LOG_WARNING, LOC +
            QString("FindH2645Keyframes: %1 frames without a keyframe.")
            .arg(m_framesSeenCount - m_lastKeyframeSeen));
    }
 
    // m_bufferPackets will only be true if a payload start has been seen
    if (hasKeyFrame && (m_bufferPackets || m_firstKeyframe >= 0))
    {
        LOG(VB_RECORD, LOG_DEBUG, LOC + QString
            ("Keyframe @ %1 + %2 = %3 AU %4")
            .arg(m_ringBuffer->GetWritePosition())
            .arg(m_payloadBuffer.size())
            .arg(m_ringBuffer->GetWritePosition() + m_payloadBuffer.size())
            .arg(m_h2645Parser->keyframeAUstreamOffset()));
 
        m_lastKeyframeSeen = m_framesSeenCount;
        HandleH2645Keyframe();
    }
 
    if (hasFrame)
    {
        LOG(VB_RECORD, LOG_DEBUG, LOC + QString
            ("Frame @ %1 + %2 = %3 AU %4")
            .arg(m_ringBuffer->GetWritePosition())
            .arg(m_payloadBuffer.size())
            .arg(m_ringBuffer->GetWritePosition() + m_payloadBuffer.size())
            .arg(m_h2645Parser->keyframeAUstreamOffset()));
 
        m_bufferPackets = false;  // We now know if this is a keyframe
        m_framesSeenCount++;
        if (!m_waitForKeyframeOption || m_firstKeyframe >= 0)
            UpdateFramesWritten();
        else
        {
            /* Found a frame that is not a keyframe, and we want to
             * start on a keyframe */
            m_payloadBuffer.clear();
        }
    }
 
    if ((aspectRatio > 0) && (aspectRatio != m_videoAspect))
    {
        m_videoAspect = aspectRatio;
        AspectChange((AspectRatio)aspectRatio, m_framesWrittenCount);
    }
 
    if (height && width && (height != m_videoHeight || m_videoWidth != width))
    {
        m_videoHeight = height;
        m_videoWidth = width;
        ResolutionChange(width, height, m_framesWrittenCount);
    }
 
    if (frameRate.isNonzero() && frameRate != m_frameRate)
    {
        LOG(VB_RECORD, LOG_INFO, LOC +
            QString("FindH2645Keyframes: timescale: %1, tick: %2, framerate: %3")
                      .arg( m_h2645Parser->GetTimeScale() )
                      .arg( m_h2645Parser->GetUnitsInTick() )
                      .arg( frameRate.toDouble() * 1000 ) );
        m_frameRate = frameRate;
        FrameRateChange(frameRate.toDouble() * 1000, m_framesWrittenCount);
    }
 
    if (scantype != SCAN_t::UNKNOWN_SCAN && scantype != m_scanType)
    {
        LOG(VB_RECORD, LOG_INFO, LOC +
            QString("FindH2645Keyframes: scan type: %1")
            .arg(scantype == SCAN_t::INTERLACED ?
                 "Interlaced" : "Progressive"));
        m_scanType = scantype;
        VideoScanChange(m_scanType, m_framesWrittenCount);
    }
 
    return m_seenSps;
}
 
void DTVRecorder::HandleH2645Keyframe(void)
{
    // Perform ringbuffer switch if needed.
    CheckForRingBufferSwitch();
 
    uint64_t startpos = 0;
    uint64_t frameNum = m_framesWrittenCount;
 
    if (m_firstKeyframe < 0)
    {
        m_firstKeyframe = frameNum;
        startpos = 0;
        SendMythSystemRecEvent("REC_STARTED_WRITING", m_curRecording);
    }
    else
    {
        startpos = m_h2645Parser->keyframeAUstreamOffset();
    }
 
    // Add key frame to position map
    m_positionMapLock.lock();
    if (!m_positionMap.contains(frameNum))
    {
        m_positionMapDelta[frameNum] = startpos;
        m_positionMap[frameNum]      = startpos;
        m_durationMap[frameNum]      = llround(m_totalDuration);
        m_durationMapDelta[frameNum] = llround(m_totalDuration);
    }
    m_positionMapLock.unlock();
}
 
void DTVRecorder::FindPSKeyFrames(const uint8_t *buffer, uint len)
{
    const uint maxKFD = kMaxKeyFrameDistance;
 
    const uint8_t *bufstart = buffer;
    const uint8_t *bufptr   = buffer;
    const uint8_t *bufend   = buffer + len;
 
    uint aspectRatio = 0;
    uint height = 0;
    uint width = 0;
    MythAVRational frameRate {0};
 
    uint skip = std::max(m_audioBytesRemaining, m_otherBytesRemaining);
    while (bufptr + skip < bufend)
    {
        bool hasFrame     = false;
        bool hasKeyFrame  = false;
 
        const uint8_t *tmp = bufptr;
        bufptr = ByteReader::find_start_code_truncated(bufptr + skip, bufend, &m_startCode);
        m_audioBytesRemaining = 0;
        m_otherBytesRemaining = 0;
        m_videoBytesRemaining -= std::min(
            (uint)(bufptr - tmp), m_videoBytesRemaining);
 
        if (!ByteReader::start_code_is_valid(m_startCode))
            continue;
 
        // NOTE: Length may be zero for packets that only contain bytes from
        // video elementary streams in TS packets. 13818-1:2000 2.4.3.7
        int pes_packet_length = -1;
        if ((bufend - bufptr) >= 2)
            pes_packet_length = ((bufptr[0]<<8) | bufptr[1]) + 2 + 6;
 
        const int stream_id = m_startCode & 0x000000ff;
        if (m_videoBytesRemaining)
        {
            if (PESStreamID::PictureStartCode == stream_id)
            { // pes_packet_length is meaningless
                pes_packet_length = -1;
                if (bufend-bufptr >= 4)
                {
                    uint frmtypei = (bufptr[1]>>3) & 0x7;
                    if ((1 <= frmtypei) && (frmtypei <= 5))
                        hasFrame = true;
                }
                else
                {
                    hasFrame = true;
                }
            }
            else if (PESStreamID::GOPStartCode == stream_id)
            { // pes_packet_length is meaningless
                pes_packet_length = -1;
                m_lastGopSeen   = m_framesSeenCount;
                hasKeyFrame     = true;
            }
            else if (PESStreamID::SequenceStartCode == stream_id)
            { // pes_packet_length is meaningless
                pes_packet_length = -1;
                m_lastSeqSeen  = m_framesSeenCount;
                hasKeyFrame    |= (m_lastGopSeen + maxKFD)<m_framesSeenCount;
 
                // Look for aspectRatio changes and store them in the database
                aspectRatio = (bufptr[3] >> 4);
 
                // Get resolution
                height = ((bufptr[1] & 0xf) << 8) | bufptr[2];
                width = (bufptr[0] <<4) | (bufptr[1]>>4);
 
                frameRate = frameRateMap[(bufptr[3] & 0x0000000f)];
            }
        }
        else if (!m_audioBytesRemaining)
        {
            if ((stream_id >= PESStreamID::MPEGVideoStreamBegin) &&
                (stream_id <= PESStreamID::MPEGVideoStreamEnd))
            { // ok-dvdinfo
                m_videoBytesRemaining = std::max(0, pes_packet_length);
            }
            else if ((stream_id >= PESStreamID::MPEGAudioStreamBegin) &&
                     (stream_id <= PESStreamID::MPEGAudioStreamEnd))
            { // ok-dvdinfo
                m_audioBytesRemaining = std::max(0, pes_packet_length);
            }
        }
 
        if (PESStreamID::PaddingStream == stream_id)
        { // ok-dvdinfo
            m_otherBytesRemaining = std::max(0, pes_packet_length);
        }
 
        m_startCode = 0xffffffff; // reset start code
 
        if (hasFrame && !hasKeyFrame)
        {
            // If we have seen kMaxKeyFrameDistance frames since the
            // last GOP or SEQ stream_id, then pretend this picture
            // is a keyframe. We may get artifacts but at least
            // we will be able to skip frames.
            hasKeyFrame = ((m_framesSeenCount & 0xf) == 0U);
            hasKeyFrame &= (m_lastGopSeen + maxKFD) < m_framesSeenCount;
            hasKeyFrame &= (m_lastSeqSeen + maxKFD) < m_framesSeenCount;
        }
 
        if (hasFrame)
        {
            m_framesSeenCount++;
            if (!m_waitForKeyframeOption || m_firstKeyframe >= 0)
                UpdateFramesWritten();
        }
 
        if (hasKeyFrame)
        {
            m_lastKeyframeSeen = m_framesSeenCount;
            HandleKeyframe((int64_t)m_payloadBuffer.size() - (bufptr - bufstart));
        }
 
        if ((aspectRatio > 0) && (aspectRatio != m_videoAspect))
        {
            m_videoAspect = aspectRatio;
            AspectChange((AspectRatio)aspectRatio, m_framesWrittenCount);
        }
 
        if (height && width &&
            (height != m_videoHeight || m_videoWidth != width))
        {
            m_videoHeight = height;
            m_videoWidth = width;
            ResolutionChange(width, height, m_framesWrittenCount);
        }
 
        if (frameRate.isNonzero() && frameRate != m_frameRate)
        {
            m_frameRate = frameRate;
            LOG(VB_RECORD, LOG_INFO, LOC +
                QString("FindPSKeyFrames: frame rate = %1")
                .arg(frameRate.toDouble() * 1000));
            FrameRateChange(frameRate.toDouble() * 1000, m_framesWrittenCount);
        }
 
        if (hasKeyFrame || hasFrame)
        {
            // We are free to write the packet, but if we have
            // buffered packet[s] we have to write them first...
            if (!m_payloadBuffer.empty())
            {
                if (m_ringBuffer)
                {
                    m_ringBuffer->Write(
                        (m_payloadBuffer).data(), m_payloadBuffer.size());
                }
                m_payloadBuffer.clear();
            }
 
            if (m_ringBuffer)
                m_ringBuffer->Write(bufstart, (bufptr - bufstart));
 
            bufstart = bufptr;
        }
 
        skip = std::max(m_audioBytesRemaining, m_otherBytesRemaining);
    }
 
    int bytes_skipped = bufend - bufptr;
    if (bytes_skipped > 0)
    {
        m_audioBytesRemaining -= std::min(
            (uint)bytes_skipped, m_audioBytesRemaining);
        m_videoBytesRemaining -= std::min(
            (uint)bytes_skipped, m_videoBytesRemaining);
        m_otherBytesRemaining -= std::min(
            (uint)bytes_skipped, m_otherBytesRemaining);
    }
 
    uint64_t idx = m_payloadBuffer.size();
    uint64_t rem = (bufend - bufstart);
    m_payloadBuffer.resize(idx + rem);
    memcpy(&m_payloadBuffer[idx], bufstart, rem);
#if 0
    LOG(VB_GENERAL, LOG_DEBUG, LOC +
        QString("idx: %1, rem: %2").arg(idx).arg(rem));
#endif
}
 
void DTVRecorder::HandlePAT(const ProgramAssociationTable *_pat)
{
    if (!_pat)
    {
        LOG(VB_RECORD, LOG_ERR, LOC + "SetPAT(NULL)");
        return;
    }
 
    QMutexLocker change_lock(&m_pidLock);
 
    int progNum = m_streamData->DesiredProgram();
    uint pmtpid = _pat->FindPID(progNum);
 
    // If we have not found the desired program in the PAT and this happens to be
    // an SPTS then update the desired program to the one that is present in the PAT.
    if (!pmtpid)
    {
        if (_pat->ProgramCount() == 1)
        {
            int oldProgNum = progNum;
            progNum = _pat->ProgramNumber(0);
            LOG(VB_GENERAL, LOG_INFO, LOC +
                QString("Update desired program found in SPTS PAT from %1 to %2")
                .arg(oldProgNum).arg(progNum));
            GetStreamData()->SetDesiredProgram(progNum);
            pmtpid = _pat->FindPID(progNum);
        }
    }
    if (!pmtpid)
    {
        LOG(VB_RECORD, LOG_ERR, LOC +
            QString("SetPAT(): Ignoring PAT not containing our desired "
                    "program (%1)...").arg(progNum));
        return;
    }
 
    LOG(VB_RECORD, LOG_INFO, LOC + QString("SetPAT(%1 on pid 0x%2)")
            .arg(progNum).arg(pmtpid,0,16));
 
    ProgramAssociationTable *oldpat = m_inputPat;
    m_inputPat = new ProgramAssociationTable(*_pat);
    delete oldpat;
 
    // Listen for the other PMTs for faster channel switching
    for (uint i = 0; m_inputPat && (i < m_inputPat->ProgramCount()); ++i)
    {
        uint pmt_pid = m_inputPat->ProgramPID(i);
        if (!m_streamData->IsListeningPID(pmt_pid))
            m_streamData->AddListeningPID(pmt_pid, kPIDPriorityLow);
    }
}
 
void DTVRecorder::HandlePMT(uint progNum, const ProgramMapTable *_pmt)
{
    QMutexLocker change_lock(&m_pidLock);
 
    LOG(VB_RECORD, LOG_INFO, LOC + QString("SetPMT(%1, %2)").arg(progNum)
        .arg(_pmt == nullptr ? "NULL" : "valid"));
 
 
    if ((int)progNum == m_streamData->DesiredProgram())
    {
        LOG(VB_RECORD, LOG_INFO, LOC + QString("SetPMT(%1)").arg(progNum));
        ProgramMapTable *oldpmt = m_inputPmt;
        m_inputPmt = new ProgramMapTable(*_pmt);
 
        QString sistandard = GetSIStandard();
 
        bool has_no_av = true;
        for (uint i = 0; i < m_inputPmt->StreamCount() && has_no_av; ++i)
        {
            has_no_av &= !m_inputPmt->IsVideo(i, sistandard);
            has_no_av &= !m_inputPmt->IsAudio(i, sistandard);
        }
        m_hasNoAV = has_no_av;
 
        SetCAMPMT(m_inputPmt);
        delete oldpmt;
    }
}
 
void DTVRecorder::HandleSingleProgramPAT(ProgramAssociationTable *pat,
                                         bool insert)
{
    if (!pat)
    {
        LOG(VB_RECORD, LOG_ERR, LOC + "HandleSingleProgramPAT(NULL)");
        return;
    }
 
    if (!m_ringBuffer)
        return;
 
    uint next_cc = (pat->tsheader()->ContinuityCounter()+1)&0xf;
    pat->tsheader()->SetContinuityCounter(next_cc);
    pat->GetAsTSPackets(m_scratch, next_cc);
 
    for (const auto & tspacket : m_scratch)
        DTVRecorder::BufferedWrite(tspacket, insert);
}
 
void DTVRecorder::HandleSingleProgramPMT(ProgramMapTable *pmt, bool insert)
{
    if (!pmt)
    {
        LOG(VB_RECORD, LOG_ERR, LOC + "HandleSingleProgramPMT(NULL)");
        return;
    }
 
    // We only want to do these checks once per recording
    bool seenVideo = (m_primaryVideoCodec != AV_CODEC_ID_NONE);
    bool seenAudio = (m_primaryAudioCodec != AV_CODEC_ID_NONE);
    uint bestAudioCodec = 0;
    // collect stream types for H.264 (MPEG-4 AVC) keyframe detection
    for (uint i = 0; i < pmt->StreamCount(); ++i)
    {
        // We only care about the first identifiable video stream
        if (!seenVideo && (m_primaryVideoCodec == AV_CODEC_ID_NONE) &&
            StreamID::IsVideo(pmt->StreamType(i)))
        {
            seenVideo = true; // Ignore other video streams
            switch (pmt->StreamType(i))
            {
                case StreamID::MPEG1Video:
                    m_primaryVideoCodec = AV_CODEC_ID_MPEG1VIDEO;
                    break;
                case StreamID::MPEG2Video:
                    m_primaryVideoCodec = AV_CODEC_ID_MPEG2VIDEO;
                    break;
                case StreamID::MPEG4Video:
                    m_primaryVideoCodec = AV_CODEC_ID_MPEG4;
                    break;
                case StreamID::H264Video:
                    m_primaryVideoCodec = AV_CODEC_ID_H264;
                    if (dynamic_cast<AVCParser *>(m_h2645Parser) == nullptr)
                    {
                        delete m_h2645Parser;
                        m_h2645Parser = nullptr;
                    }
                    if (m_h2645Parser == nullptr)
                    {
                        auto * avcParser = new AVCParser;
                        if (avcParser != nullptr)
                        {
                            m_h2645Parser = reinterpret_cast<H2645Parser *>
                                (avcParser);
                            avcParser->use_I_forKeyframes(m_useIForKeyframe);
                        }
                    }
                    break;
                case StreamID::H265Video:
                  LOG(VB_GENERAL, LOG_INFO, LOC + "HEVC detected");
                    m_primaryVideoCodec = AV_CODEC_ID_H265;
                    if (dynamic_cast<HEVCParser *>(m_h2645Parser) == nullptr)
                    {
                        delete m_h2645Parser;
                        m_h2645Parser = nullptr;
                    }
                    if (m_h2645Parser == nullptr)
                    {
                        m_h2645Parser = reinterpret_cast<H2645Parser *>
                                        (new HEVCParser);
                    }
                    break;
                case StreamID::OpenCableVideo:
                    m_primaryVideoCodec = AV_CODEC_ID_MPEG2VIDEO; // TODO Will it always be MPEG2?
                    break;
                case StreamID::VC1Video:
                    m_primaryVideoCodec = AV_CODEC_ID_VC1;
                    break;
                default:
                    break;
            }
 
            if (m_primaryVideoCodec != AV_CODEC_ID_NONE)
                VideoCodecChange(m_primaryVideoCodec);
        }
 
        // We want the 'best' identifiable audio stream, where 'best' is
        // subjective and no-one will likely agree.
        // For now it's the 'best' codec, assuming mpeg stream types range
        // from worst to best, which it does
        if (!seenAudio && StreamID::IsAudio(pmt->StreamType(i)) &&
            pmt->StreamType(i) > bestAudioCodec)
        {
            bestAudioCodec = pmt->StreamType(i);
            switch (pmt->StreamType(i))
            {
                case StreamID::MPEG1Audio: // MPEG-1 Layer 2 (MP2)
                case StreamID::MPEG2Audio: // MPEG-2 Part 3 (MP2 Multichannel)
                    m_primaryAudioCodec = AV_CODEC_ID_MP2;
                    break;
                case StreamID::MPEG2AACAudio:
                    m_primaryAudioCodec = AV_CODEC_ID_AAC;
                    break;
                case StreamID::MPEG2AudioAmd1:
                    m_primaryAudioCodec = AV_CODEC_ID_AAC_LATM;
                    break;
                case StreamID::AC3Audio:
                    m_primaryAudioCodec = AV_CODEC_ID_AC3;
                    break;
                case StreamID::EAC3Audio:
                    m_primaryAudioCodec = AV_CODEC_ID_EAC3;
                    break;
                case StreamID::DTSAudio:
                    m_primaryAudioCodec = AV_CODEC_ID_DTS;
                    break;
                default:
                    break;
            }
 
            if (m_primaryAudioCodec != AV_CODEC_ID_NONE)
                AudioCodecChange(m_primaryAudioCodec);
        }
 
//         LOG(VB_GENERAL, LOG_DEBUG, QString("Recording(%1): Stream #%2: %3 ")
//             .arg(m_curRecording ? QString::number(m_curRecording->GetRecordingID()) : "")
//             .arg(i)
//             .arg(StreamID::GetDescription(pmt->StreamType(i))));
        m_streamId[pmt->StreamPID(i)] = pmt->StreamType(i);
    }
 
    // If the PCRPID is valid and the PCR is not contained
    // in another stream, make sure the PCR stream is not
    // discarded (use PrivSec type as dummy 'valid' value)
    if (pmt->PCRPID() != 0x1fff && pmt->FindPID(pmt->PCRPID()) == -1)
        m_streamId[pmt->PCRPID()] = StreamID::PrivSec;
 
    if (!m_ringBuffer)
        return;
 
    uint next_cc = (pmt->tsheader()->ContinuityCounter()+1)&0xf;
    pmt->tsheader()->SetContinuityCounter(next_cc);
    pmt->GetAsTSPackets(m_scratch, next_cc);
 
    for (const auto & tspacket : m_scratch)
        DTVRecorder::BufferedWrite(tspacket, insert);
}
 
bool DTVRecorder::ProcessTSPacket(const TSPacket &tspacket)
{
    const uint pid = tspacket.PID();
 
    if (pid != 0x1fff)
        m_packetCount.fetchAndAddAcquire(1);
 
    // Check continuity counter
    uint old_cnt = m_continuityCounter[pid];
    if ((pid != 0x1fff) && !CheckCC(pid, tspacket.ContinuityCounter()))
    {
        int v = m_continuityErrorCount.fetchAndAddRelaxed(1) + 1;
        double erate = v * 100.0 / m_packetCount.fetchAndAddRelaxed(0);
        LOG(VB_RECORD, LOG_WARNING, LOC +
            QString("PID 0x%1 discontinuity detected ((%2+1)%16!=%3) %4%")
                .arg(pid,0,16).arg(old_cnt,2)
                .arg(tspacket.ContinuityCounter(),2)
                .arg(erate));
    }
 
    // Only create fake keyframe[s] if there are no audio/video streams
    if (m_inputPmt && m_hasNoAV)
    {
        FindOtherKeyframes(&tspacket);
        m_bufferPackets = false;
    }
    else if (m_recordMptsOnly)
    {
        /* When recording the full, unfiltered, MPTS, trigger a write
         * every 0.5 seconds.  Since the packets are unfiltered and
         * unprocessed we cannot wait for a keyframe to trigger the
         * writes. */
 
        if (m_framesSeenCount++ == 0)
            m_recordMptsTimer.start();
 
        if (m_recordMptsTimer.elapsed() > 0.5s)
        {
            UpdateFramesWritten();
            m_lastKeyframeSeen = m_framesSeenCount;
            HandleKeyframe(m_payloadBuffer.size());
            m_recordMptsTimer.addMSecs(-500ms);
        }
    }
    else if (m_streamId[pid] == 0)
    {
        // Ignore this packet if the PID should be stripped
        return true;
    }
    else
    {
        // There are audio/video streams. Only write the packet
        // if audio/video key-frames have been found
        if (m_waitForKeyframeOption && m_firstKeyframe < 0)
            return true;
    }
 
    BufferedWrite(tspacket);
 
    return true;
}
 
bool DTVRecorder::ProcessVideoTSPacket(const TSPacket &tspacket)
{
    if (!m_ringBuffer)
        return true;
 
    uint streamType = m_streamId[tspacket.PID()];
 
    if (tspacket.HasPayload() && tspacket.PayloadStart())
    {
        if (m_bufferPackets && m_firstKeyframe >= 0 && !m_payloadBuffer.empty())
        {
            // Flush the buffer
            if (m_ringBuffer)
                m_ringBuffer->Write((m_payloadBuffer).data(), m_payloadBuffer.size());
            m_payloadBuffer.clear();
        }
 
        // buffer packets until we know if this is a keyframe
        m_bufferPackets = true;
    }
 
    // Check for keyframes and count frames
    if (streamType == StreamID::H264Video ||
        streamType == StreamID::H265Video)
        FindH2645Keyframes(&tspacket);
    else if (streamType != 0)
        FindMPEG2Keyframes(&tspacket);
    else
        LOG(VB_RECORD, LOG_ERR, LOC +
            "ProcessVideoTSPacket: unknown stream type!");
 
    return ProcessAVTSPacket(tspacket);
}
 
bool DTVRecorder::ProcessAudioTSPacket(const TSPacket &tspacket)
{
    if (!m_ringBuffer)
        return true;
 
    if (tspacket.HasPayload() && tspacket.PayloadStart())
    {
        if (m_bufferPackets && m_firstKeyframe >= 0 && !m_payloadBuffer.empty())
        {
            // Flush the buffer
            if (m_ringBuffer)
                m_ringBuffer->Write((m_payloadBuffer).data(), m_payloadBuffer.size());
            m_payloadBuffer.clear();
        }
 
        // buffer packets until we know if this is a keyframe
        m_bufferPackets = true;
    }
 
    FindAudioKeyframes(&tspacket);
    return ProcessAVTSPacket(tspacket);
}
 
bool DTVRecorder::ProcessAVTSPacket(const TSPacket &tspacket)
{
    // Sync recording start to first keyframe
    if (m_waitForKeyframeOption && m_firstKeyframe < 0)
    {
        if (m_bufferPackets)
            BufferedWrite(tspacket);
        return true;
    }
 
    const uint pid = tspacket.PID();
 
    if (pid != 0x1fff)
        m_packetCount.fetchAndAddAcquire(1);
 
    // Check continuity counter
    uint old_cnt = m_continuityCounter[pid];
    if ((pid != 0x1fff) && !CheckCC(pid, tspacket.ContinuityCounter()))
    {
        int v = m_continuityErrorCount.fetchAndAddRelaxed(1) + 1;
        double erate = v * 100.0 / m_packetCount.fetchAndAddRelaxed(0);
        LOG(VB_RECORD, LOG_WARNING, LOC +
            QString("A/V PID 0x%1 discontinuity detected ((%2+1)%16!=%3) %4%")
                .arg(pid,0,16).arg(old_cnt).arg(tspacket.ContinuityCounter())
                .arg(erate,5,'f',2));
    }
 
    if (!(m_pidStatus[pid] & kPayloadStartSeen))
    {
        m_pidStatus[pid] |= kPayloadStartSeen;
        LOG(VB_RECORD, LOG_INFO, LOC +
            QString("PID 0x%1 Found Payload Start").arg(pid,0,16));
    }
 
    BufferedWrite(tspacket);
 
    return true;
}
 
RecordingQuality *DTVRecorder::GetRecordingQuality(const RecordingInfo *r) const
{
    RecordingQuality *recq = RecorderBase::GetRecordingQuality(r);
    recq->AddTSStatistics(
        m_continuityErrorCount.fetchAndAddRelaxed(0),
        m_packetCount.fetchAndAddRelaxed(0));
    return recq;
}
 
/* vim: set expandtab tabstop=4 shiftwidth=4: */