mythplayer.cpp

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// -*- Mode: c++ -*-
 
#undef HAVE_AV_CONFIG_H
 
// C++ headers
#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <unistd.h>
 
// Qt headers
#include <QCoreApplication>
#include <QDir>
#include <QHash>
#include <QMap>
#include <QThread>
#include <QtCore/qnumeric.h>
#include <utility>
 
// MythTV headers
#include "libmyth/audio/audiooutput.h"
#include "libmythbase/mthread.h"
#include "libmythbase/mythconfig.h"
#include "libmythbase/mythcorecontext.h"
#include "libmythbase/mythlogging.h"
#include "libmythbase/mythmiscutil.h"
#include "libmythbase/mythtimer.h"
#include "libmythbase/programinfo.h"
#include "libmythui/mythmainwindow.h"
#include "libmythui/mythuiactions.h"
 
#include "DetectLetterbox.h"
#include "audioplayer.h"
#include "cardutil.h"
#include "decoders/avformatdecoder.h"
#include "decoders/mythcodeccontext.h"
#include "decoders/mythdecoderthread.h"
#include "dummydecoder.h"
#include "io/mythmediabuffer.h"
#include "jitterometer.h"
#include "livetvchain.h"
#include "mythavutil.h"
#include "mythplayer.h"
#include "mythvideooutnull.h"
#include "remoteencoder.h"
#include "tv_actions.h"
#include "tv_play.h"
 
extern "C" {
#include "libavcodec/avcodec.h"
}
 
static unsigned dbg_ident(const MythPlayer* /*player*/);
 
#define LOC QString("Player(%1): ").arg(dbg_ident(this),0,36)
 
const int MythPlayer::kNightModeBrightenssAdjustment = 10;
const int MythPlayer::kNightModeContrastAdjustment = 10;
 
// Exact frame seeking, no inaccuracy allowed.
const double MythPlayer::kInaccuracyNone = 0;
 
// By default, when seeking, snap to a keyframe if the keyframe's
// distance from the target frame is less than 10% of the total seek
// distance.
const double MythPlayer::kInaccuracyDefault = 0.1;
 
// Allow greater inaccuracy (50%) in the cutlist editor (unless the
// editor seek distance is set to 1 frame or 1 keyframe).
const double MythPlayer::kInaccuracyEditor = 0.5;
 
// Any negative value means completely inexact, i.e. seek to the
// keyframe that is closest to the target.
const double MythPlayer::kInaccuracyFull = -1.0;
 
// How close we can seek to the end of a recording.
const double MythPlayer::kSeekToEndOffset = 1.0;
 
MythPlayer::MythPlayer(PlayerContext* Context, PlayerFlags Flags)
  : m_playerCtx(Context),
    m_playerFlags(Flags),
    //AV subtitles
    m_subReader(this),
    // CC608/708
    m_cc608(this), m_cc708(this),
    // Audio
    m_audio(this, (Flags & kAudioMuted) != 0)
{
    m_playerThread = QThread::currentThread();
#ifdef Q_OS_ANDROID
    m_playerThreadId = gettid();
#endif
    m_deleteMap.SetPlayerContext(m_playerCtx);
    m_liveTV = m_playerCtx->m_tvchain;
 
    m_vbiMode = VBIMode::Parse(gCoreContext->GetSetting("VbiFormat"));
    m_captionsEnabledbyDefault = gCoreContext->GetBoolSetting("DefaultCCMode");
    m_endExitPrompt      = gCoreContext->GetNumSetting("EndOfRecordingExitPrompt");
 
    // Get VBI page number
    QString mypage = gCoreContext->GetSetting("VBIpageNr", "888");
    bool valid = false;
    uint tmp = mypage.toInt(&valid, 16);
    m_ttPageNum = (valid) ? tmp : m_ttPageNum;
    m_cc608.SetTTPageNum(m_ttPageNum);
}
 
MythPlayer::~MythPlayer(void)
{
    QMutexLocker lock2(&m_vidExitLock);
 
    SetDecoder(nullptr);
 
    delete m_decoderThread;
    m_decoderThread = nullptr;
 
    delete m_videoOutput;
    m_videoOutput = nullptr;
}
 
void MythPlayer::SetWatchingRecording(bool mode)
{
    m_watchingRecording = mode;
    if (m_decoder)
        m_decoder->SetWatchingRecording(mode);
}
 
bool MythPlayer::IsWatchingInprogress(void) const
{
    return m_watchingRecording && m_playerCtx->m_recorder && m_playerCtx->m_recorder->IsValidRecorder();
}
 
void MythPlayer::PauseBuffer(void)
{
    m_bufferPauseLock.lock();
    if (m_playerCtx->m_buffer)
    {
        m_playerCtx->m_buffer->Pause();
        m_playerCtx->m_buffer->WaitForPause();
    }
    m_bufferPaused = true;
    m_bufferPauseLock.unlock();
}
 
void MythPlayer::UnpauseBuffer(void)
{
    m_bufferPauseLock.lock();
    if (m_playerCtx->m_buffer)
        m_playerCtx->m_buffer->Unpause();
    m_bufferPaused = false;
    m_bufferPauseLock.unlock();
}
 
bool MythPlayer::Pause(void)
{
    while (!m_pauseLock.tryLock(100))
    {
        LOG(VB_PLAYBACK, LOG_INFO, LOC + "Waited 100ms to get pause lock.");
        DecoderPauseCheck();
    }
    bool already_paused = m_allPaused;
    if (already_paused)
    {
        m_pauseLock.unlock();
        return already_paused;
    }
    m_nextPlaySpeed   = 0.0;
    m_nextNormalSpeed = false;
    PauseVideo();
    m_audio.Pause(true);
    PauseDecoder();
    PauseBuffer();
    if (!m_decoderPaused)
        PauseDecoder(); // Retry in case audio only stream
    m_allPaused = m_decoderPaused && m_videoPaused && m_bufferPaused;
    {
        if (FlagIsSet(kVideoIsNull) && m_decoder)
            m_decoder->UpdateFramesPlayed();
        else if (m_videoOutput && !FlagIsSet(kVideoIsNull))
            m_framesPlayed = m_videoOutput->GetFramesPlayed();
    }
    m_pauseLock.unlock();
    emit PauseChanged(m_allPaused);
    return already_paused;
}
 
bool MythPlayer::Play(float speed, bool normal, bool unpauseaudio)
{
    m_pauseLock.lock();
    LOG(VB_PLAYBACK, LOG_INFO, LOC +
        QString("Play(%1, normal %2, unpause audio %3)")
            .arg(speed,5,'f',1).arg(normal).arg(unpauseaudio));
 
    if (m_deleteMap.IsEditing())
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Ignoring Play(), in edit mode.");
        m_pauseLock.unlock();
        return false;
    }
 
    m_avSync.InitAVSync();
 
    SetEof(kEofStateNone);
    UnpauseBuffer();
    UnpauseDecoder();
    if (unpauseaudio)
        m_audio.Pause(false);
    UnpauseVideo();
    m_allPaused = false;
    m_nextPlaySpeed   = speed;
    m_nextNormalSpeed = normal;
    m_pauseLock.unlock();
    emit PauseChanged(m_allPaused);
    return true;
}
 
void MythPlayer::PauseVideo(void)
{
    m_videoPauseLock.lock();
    m_needNewPauseFrame = true;
    m_videoPaused = true;
    m_videoPauseLock.unlock();
}
 
void MythPlayer::UnpauseVideo(void)
{
    m_videoPauseLock.lock();
    m_videoPaused = false;
    m_videoPauseLock.unlock();
}
 
void MythPlayer::SetPlayingInfo(const ProgramInfo &pginfo)
{
    assert(m_playerCtx);
    if (!m_playerCtx)
        return;
 
    m_playerCtx->LockPlayingInfo(__FILE__, __LINE__);
    m_playerCtx->SetPlayingInfo(&pginfo);
    m_playerCtx->UnlockPlayingInfo(__FILE__, __LINE__);
}
 
void MythPlayer::SetPlaying(bool is_playing)
{
    QMutexLocker locker(&m_playingLock);
 
    m_playing = is_playing;
 
    m_playingWaitCond.wakeAll();
}
 
bool MythPlayer::IsPlaying(std::chrono::milliseconds wait_in_msec, bool wait_for) const
{
    QMutexLocker locker(&m_playingLock);
 
    if (wait_in_msec == 0ms)
        return m_playing;
 
    MythTimer t;
    t.start();
 
    while ((wait_for != m_playing) && (t.elapsed() < wait_in_msec))
    {
        m_playingWaitCond.wait(
            &m_playingLock, std::max(0ms,wait_in_msec - t.elapsed()).count());
    }
 
    return m_playing;
}
 
bool MythPlayer::InitVideo(void)
{
    if (!m_playerCtx)
        return false;
 
    if (!m_decoder)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Cannot create a video renderer without a decoder.");
        return false;
    }
 
    m_videoOutput = MythVideoOutputNull::Create(m_videoDim, m_videoDispDim, m_videoAspect,
                                                m_decoder->GetVideoCodecID());
 
    if (!m_videoOutput)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Couldn't create VideoOutput instance. Exiting..");
        SetErrored(tr("Failed to initialize video output"));
        return false;
    }
 
    return true;
}
 
void MythPlayer::ReinitVideo(bool ForceUpdate)
{
 
    bool aspect_only = false;
    {
        QMutexLocker locker(&m_vidExitLock);
        m_videoOutput->SetVideoFrameRate(static_cast<float>(m_videoFrameRate));
        float video_aspect = (m_forcedVideoAspect > 0) ? m_forcedVideoAspect : m_videoAspect;
        if (!m_videoOutput->InputChanged(m_videoDim, m_videoDispDim, video_aspect,
                                         m_decoder->GetVideoCodecID(), aspect_only,
                                         m_maxReferenceFrames, ForceUpdate))
        {
            LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to Reinitialize Video. Exiting..");
            SetErrored(tr("Failed to reinitialize video output"));
            return;
        }
    }
 
    if (!aspect_only)
        ClearAfterSeek();
}
 
void MythPlayer::SetKeyframeDistance(int keyframedistance)
{
    m_keyframeDist = (keyframedistance > 0) ? static_cast<uint>(keyframedistance) : m_keyframeDist;
}
 
void MythPlayer::SetVideoParams(int width, int height, double fps,
                                float aspect, bool ForceUpdate,
                                int ReferenceFrames, FrameScanType /*scan*/, const QString& codecName)
{
    bool paramsChanged = ForceUpdate;
 
    if (width >= 0 && height >= 0)
    {
        paramsChanged  = true;
        m_videoDim      = m_videoDispDim = QSize(width, height);
        m_videoAspect   = aspect > 0.0F ? aspect : static_cast<float>(width) / height;
    }
 
    if (!qIsNaN(fps) && fps > 0.0 && fps < 121.0)
    {
        paramsChanged    = true;
        m_videoFrameRate = fps;
        if (m_ffrewSkip != 0 && m_ffrewSkip != 1)
        {
            UpdateFFRewSkip();
        }
        else
        {
            float temp_speed = (m_playSpeed == 0.0F) ?
                m_audio.GetStretchFactor() : m_playSpeed;
            SetFrameInterval(kScan_Progressive,
                             1.0 / (m_videoFrameRate * static_cast<double>(temp_speed)));
        }
    }
 
    if (!codecName.isEmpty())
    {
        m_codecName = codecName;
        paramsChanged = true;
    }
 
    if (ReferenceFrames > 0)
    {
        m_maxReferenceFrames = ReferenceFrames;
        paramsChanged = true;
    }
 
    // Mediacodec/Surface has an issue rendering frames after seeks.
    // Enable the FF/Rew work around when using it.
    m_ffrewUseRenderOne =
        m_decoder && codec_is_mediacodec(m_decoder->GetVideoCodecID());
 
    if (!paramsChanged)
        return;
 
    if (m_videoOutput)
        ReinitVideo(ForceUpdate);
 
    if (IsErrored())
        return;
}
 
 
void MythPlayer::SetFrameRate(double fps)
{
    m_videoFrameRate = fps;
    float temp_speed = (m_playSpeed == 0.0F) ? m_audio.GetStretchFactor() : m_playSpeed;
    if (abs(m_ffrewSkip) > 1)
        UpdateFFRewSkip();
    else
        SetFrameInterval(kScan_Progressive, 1.0 / (m_videoFrameRate * static_cast<double>(temp_speed)));
}
 
void MythPlayer::SetFileLength(std::chrono::seconds total, int frames)
{
    m_totalLength = total;
    m_totalFrames = frames;
}
 
void MythPlayer::SetDuration(std::chrono::seconds duration)
{
    m_totalDuration = duration;
}
 
void MythPlayer::OpenDummy(void)
{
    m_isDummy = true;
 
    if (!m_videoOutput)
    {
        SetKeyframeDistance(15);
        SetVideoParams(720, 576, 25.00, 1.25F, false, 2);
    }
 
    m_playerCtx->LockPlayingInfo(__FILE__, __LINE__);
    auto *dec = new DummyDecoder(this, *(m_playerCtx->m_playingInfo));
    m_playerCtx->UnlockPlayingInfo(__FILE__, __LINE__);
    SetDecoder(dec);
}
 
void MythPlayer::CreateDecoder(TestBufferVec & TestBuffer)
{
    if (AvFormatDecoder::CanHandle(TestBuffer, m_playerCtx->m_buffer->GetFilename()))
        SetDecoder(new AvFormatDecoder(this, *m_playerCtx->m_playingInfo, m_playerFlags));
}
 
int MythPlayer::OpenFile(int Retries)
{
    // Sanity check
    if (!m_playerCtx || !m_playerCtx->m_buffer)
        return -1;
 
    LOG(VB_GENERAL, LOG_INFO, LOC + QString("Opening '%1'").arg(m_playerCtx->m_buffer->GetSafeFilename()));
 
    m_isDummy = false;
    m_liveTV = m_playerCtx->m_tvchain && m_playerCtx->m_buffer->LiveMode();
 
    // Dummy setup for livetv transtions. Can we get rid of this?
    if (m_playerCtx->m_tvchain)
    {
        int currentposition = m_playerCtx->m_tvchain->GetCurPos();
        if (m_playerCtx->m_tvchain->GetInputType(currentposition) == "DUMMY")
        {
            OpenDummy();
            return 0;
        }
    }
 
    // Start the RingBuffer read ahead thread
    m_playerCtx->m_buffer->Start();
 
    TestBufferVec testbuf {};
    testbuf.reserve(kDecoderProbeBufferSize);
 
    UnpauseBuffer();
 
    // delete any pre-existing recorder
    SetDecoder(nullptr);
    int testreadsize = 2048;
 
    // Test the incoming buffer and create a suitable decoder
    MythTimer bigTimer;
    bigTimer.start();
    std::chrono::milliseconds timeout =
        std::max(500ms * (Retries + 1), 30000ms);
    while (testreadsize <= kDecoderProbeBufferSize)
    {
        testbuf.resize(testreadsize);
        MythTimer peekTimer;
        peekTimer.start();
        while (m_playerCtx->m_buffer->Peek(testbuf) != testreadsize)
        {
            // NB need to allow for streams encountering network congestion
            if (peekTimer.elapsed() > 30s || bigTimer.elapsed() > timeout
                || m_playerCtx->m_buffer->GetStopReads())
            {
                LOG(VB_GENERAL, LOG_ERR, LOC +
                    QString("OpenFile(): Could not read first %1 bytes of '%2'")
                        .arg(testreadsize)
                        .arg(m_playerCtx->m_buffer->GetFilename()));
                SetErrored(tr("Could not read first %1 bytes").arg(testreadsize));
                return -1;
            }
            LOG(VB_GENERAL, LOG_WARNING, LOC + "OpenFile() waiting on data");
            std::this_thread::sleep_for(50ms);
        }
 
        m_playerCtx->LockPlayingInfo(__FILE__, __LINE__);
        CreateDecoder(testbuf);
        m_playerCtx->UnlockPlayingInfo(__FILE__, __LINE__);
        if (m_decoder || (bigTimer.elapsed() > timeout))
            break;
        testreadsize <<= 1;
    }
 
    // Fail
    if (!m_decoder)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC +
            QString("Couldn't find an A/V decoder for: '%1'")
                .arg(m_playerCtx->m_buffer->GetFilename()));
        SetErrored(tr("Could not find an A/V decoder"));
 
        return -1;
    }
 
    if (m_decoder->IsErrored())
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Could not initialize A/V decoder.");
        SetDecoder(nullptr);
        SetErrored(tr("Could not initialize A/V decoder"));
 
        return -1;
    }
 
    // Pre-init the decoder
    m_decoder->SetSeekSnap(0);
    m_decoder->SetLiveTVMode(m_liveTV);
    m_decoder->SetWatchingRecording(m_watchingRecording);
    // TODO (re)move this into MythTranscode player
    m_decoder->SetTranscoding(m_transcoding);
 
    // Open the decoder
    int result = m_decoder->OpenFile(m_playerCtx->m_buffer, false, testbuf);
 
    if (result < 0)
    {
        LOG(VB_GENERAL, LOG_ERR, QString("Couldn't open decoder for: %1")
                .arg(m_playerCtx->m_buffer->GetFilename()));
        SetErrored(tr("Could not open decoder"));
        return -1;
    }
 
    // Disable audio if necessary
    m_audio.CheckFormat();
 
    // Livetv, recording or in-progress
    if (result > 0)
    {
        m_hasFullPositionMap = true;
        m_deleteMap.LoadMap();
        m_deleteMap.TrackerReset(0);
    }
 
    // Determine the initial bookmark and update it for the cutlist
    m_bookmarkSeek = GetBookmark();
    m_deleteMap.TrackerReset(m_bookmarkSeek);
    m_deleteMap.TrackerWantsToJump(m_bookmarkSeek, m_bookmarkSeek);
 
    if (!gCoreContext->IsDatabaseIgnored() &&
        m_playerCtx->m_playingInfo->QueryAutoExpire() == kLiveTVAutoExpire)
    {
        gCoreContext->SaveSetting("DefaultChanid",
                                  static_cast<int>(m_playerCtx->m_playingInfo->GetChanID()));
        QString callsign = m_playerCtx->m_playingInfo->GetChannelSchedulingID();
        QString channum = m_playerCtx->m_playingInfo->GetChanNum();
        gCoreContext->SaveSetting("DefaultChanKeys", callsign + "[]:[]" + channum);
        if (m_playerCtx->m_recorder && m_playerCtx->m_recorder->IsValidRecorder())
        {
            uint cardid = static_cast<uint>(m_playerCtx->m_recorder->GetRecorderNumber());
            CardUtil::SetStartChannel(cardid, channum);
        }
    }
 
    return IsErrored() ? -1 : 0;
}
 
void MythPlayer::SetFramesPlayed(uint64_t played)
{
    m_framesPlayed = played;
    if (m_videoOutput)
        m_videoOutput->SetFramesPlayed(played);
}
 
int MythPlayer::GetFreeVideoFrames(void) const
{
    if (m_videoOutput)
        return m_videoOutput->FreeVideoFrames();
    return 0;
}
 
MythVideoFrame *MythPlayer::GetNextVideoFrame(void)
{
    if (m_videoOutput)
        return m_videoOutput->GetNextFreeFrame();
    return nullptr;
}
 
void MythPlayer::ReleaseNextVideoFrame(MythVideoFrame *buffer,
                                       std::chrono::milliseconds timecode,
                                       bool wrap)
{
    if (wrap)
        WrapTimecode(timecode, TC_VIDEO);
    buffer->m_timecode = timecode;
    m_latestVideoTimecode = timecode;
 
    if (m_decodeOneFrame)
        LOG(VB_PLAYBACK, LOG_DEBUG, LOC + "Clearing decode one");
    m_decodeOneFrame = false;
 
    if (m_videoOutput)
    {
        if (abs(m_ffrewSkip) > 1 && m_ffrewUseRenderOne)
        {
            LOG(VB_PLAYBACK, LOG_DEBUG, LOC + "Setting render one");
            m_renderOneFrame = true;
        }
        m_videoOutput->ReleaseFrame(buffer);
    }
 
    // FIXME need to handle this in the correct place in the main thread (DVD stills?)
    //if (m_allPaused)
    //    CheckAspectRatio(buffer);
}
 
void MythPlayer::DiscardVideoFrame(MythVideoFrame *buffer)
{
    if (m_videoOutput)
        m_videoOutput->DiscardFrame(buffer);
}
 
void MythPlayer::DiscardVideoFrames(bool KeyFrame, bool Flushed)
{
    if (m_videoOutput)
    {
        m_videoOutput->DiscardFrames(KeyFrame, Flushed);
        if (m_renderOneFrame)
            LOG(VB_PLAYBACK, LOG_DEBUG, LOC + "Clearing render one");
        m_renderOneFrame = false;
    }
}
 
bool MythPlayer::HasReachedEof(void) const
{
    EofState eof = GetEof();
    if (eof != kEofStateNone && !m_allPaused)
        return true;
    if (GetEditMode())
        return false;
    if (m_liveTV)
        return false;
    if (!m_deleteMap.IsEmpty() && m_framesPlayed >= m_deleteMap.GetLastFrame())
        return true;
    return false;
}
 
void MythPlayer::DeLimboFrame(MythVideoFrame *frame)
{
    if (m_videoOutput)
        m_videoOutput->DeLimboFrame(frame);
}
 
void MythPlayer::EnableForcedSubtitles(bool enable)
{
    if (enable)
        m_enableForcedSubtitles = true;
    else
        m_disableForcedSubtitles = true;
}
 
void MythPlayer::SetFrameInterval(FrameScanType scan, double frame_period)
{
    if (m_decoder)
        m_fpsMultiplier = m_decoder->GetfpsMultiplier();
    m_frameInterval = microsecondsFromFloat(1000000.0 * frame_period / m_fpsMultiplier);
 
    LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("SetFrameInterval Interval:%1 Speed:%2 Scan:%3 (Multiplier: %4)")
        .arg(m_frameInterval.count()).arg(static_cast<double>(m_playSpeed)).arg(ScanTypeToString(scan)).arg(m_fpsMultiplier));
}
 
void MythPlayer::InitFrameInterval()
{
    // try to get preferential scheduling, but ignore if we fail to.
    myth_nice(-19);
}
 
void MythPlayer::SetBuffering(bool new_buffering)
{
    if (!m_buffering && new_buffering)
    {
        LOG(VB_PLAYBACK, LOG_INFO, LOC + "Waiting for video buffers...");
        m_buffering = true;
        m_bufferingStart = QTime::currentTime();
        m_bufferingLastMsg = QTime::currentTime();
    }
    else if (m_buffering && !new_buffering)
    {
        m_buffering = false;
    }
}
 
// For debugging playback set this to increase the timeout so that
// playback does not fail if stepping through code.
// Set PREBUFFERDEBUG to any value and you will get 30 minutes.
static bool preBufferDebug = qEnvironmentVariableIsSet("PREBUFFERDEBUG");
 
bool MythPlayer::PrebufferEnoughFrames(int min_buffers)
{
    if (!m_videoOutput)
        return false;
 
    if (!min_buffers
        && (FlagIsSet(kMusicChoice)
            || abs(m_ffrewSkip) > 1
            || GetEof() != kEofStateNone))
        min_buffers = 1;
 
    auto wait = false;
    if (min_buffers)
        wait = m_videoOutput->ValidVideoFrames() < min_buffers;
    else
        wait = !m_videoOutput->EnoughDecodedFrames();
 
    if (!wait)
    {
        if (!m_avSync.GetAVSyncAudioPause() && m_audio.IsPaused())
            m_audio.Pause(false);
        SetBuffering(false);
        return m_videoOutput->ValidVideoFrames();
    }
 
    SetBuffering(true);
 
    // This piece of code is to address the problem, when starting
    // Live TV, of jerking and stuttering. Without this code
    // that could go on forever, but is cured by a pause and play.
    // This code inserts a brief pause and play when the potential
    // for the jerking is detected.
    if ((m_liveTV || IsWatchingInprogress())
        && !FlagIsSet(kMusicChoice)
        && m_ffrewSkip == 1
        && m_avSync.GetAVSyncAudioPause() != kAVSyncAudioPausedLiveTV)
    {
        auto behind = (GetCurrentFrameCount() - m_framesPlayed) /
            m_videoFrameRate;
        if (behind < 3.0)
        {
            LOG(VB_PLAYBACK, LOG_NOTICE, LOC +
                "Pause to allow live tv catch up");
            m_avSync.ResetAVSyncForLiveTV(&m_audio);
        }
    }
 
    std::this_thread::sleep_for(m_frameInterval / 8);
    auto waited_for = std::chrono::milliseconds(m_bufferingStart.msecsTo(QTime::currentTime()));
    auto last_msg = std::chrono::milliseconds(m_bufferingLastMsg.msecsTo(QTime::currentTime()));
    if (last_msg > 100ms && !FlagIsSet(kMusicChoice))
    {
        if (++m_bufferingCounter == 10)
            LOG(VB_GENERAL, LOG_NOTICE, LOC +
                "To see more buffering messages use -v playback");
        LOG(m_bufferingCounter >= 10 ? VB_PLAYBACK : VB_GENERAL,
            LOG_NOTICE, LOC +
            QString("Waited %1ms for video buffers %2")
            .arg(waited_for.count()).arg(m_videoOutput->GetFrameStatus()));
        m_bufferingLastMsg = QTime::currentTime();
        if (waited_for > 7s && m_audio.IsBufferAlmostFull()
            && m_framesPlayed < 5
            && gCoreContext->GetBoolSetting("MusicChoiceEnabled", false))
        {
            m_playerFlags = static_cast<PlayerFlags>(m_playerFlags | kMusicChoice);
            LOG(VB_GENERAL, LOG_NOTICE, LOC + "Music Choice program detected - disabling AV Sync.");
            m_avSync.SetAVSyncMusicChoice(&m_audio);
        }
        if (waited_for > 7s && m_audio.IsBufferAlmostFull()
            && !FlagIsSet(kMusicChoice))
        {
            // We are likely to enter this condition
            // if the audio buffer was too full during GetFrame in AVFD
            LOG(VB_GENERAL, LOG_NOTICE, LOC + "Resetting audio buffer");
            m_audio.Reset();
        }
    }
 
    std::chrono::milliseconds msecs { 500ms };
    if (preBufferDebug)
        msecs = 30min;
    if ((waited_for > msecs) && !m_videoOutput->EnoughFreeFrames())
    {
        LOG(VB_GENERAL, LOG_NOTICE, LOC +
            "Timed out waiting for frames, and"
            "\n\t\t\tthere are not enough free frames. "
            "Discarding buffered frames.");
        // This call will result in some ugly frames, but allows us
        // to recover from serious problems if frames get leaked.
        DiscardVideoFrames(true, true);
    }
 
    msecs = 30s;
    if (preBufferDebug)
        msecs = 30min;
    if (waited_for > msecs) // 30 seconds for internet streamed media
    {
        LOG(VB_GENERAL, LOG_ERR, LOC +
            "Waited too long for decoder to fill video buffers. Exiting..");
        SetErrored(tr("Video frame buffering failed too many times."));
    }
 
    return false;
}
 
void MythPlayer::VideoEnd(void)
{
    m_vidExitLock.lock();
    delete m_videoOutput;
    m_videoOutput = nullptr;
    m_vidExitLock.unlock();
}
 
bool MythPlayer::FastForward(float seconds)
{
    if (!m_videoOutput)
        return false;
 
    // Update m_totalFrames so we know how far we can skip
    if (m_decoder)
        m_decoder->SyncPositionMap();
 
    if (m_ffTime <= 0)
    {
        float current   = ComputeSecs(m_framesPlayed, true);
        float dest      = current + seconds;
        float length    = ComputeSecs(m_totalFrames, true);
 
        if (dest > length)
        {
            auto msec = millisecondsFromFloat(seconds * 1000);
            int64_t pos = TranslatePositionMsToFrame(msec, false);
            if (CalcMaxFFTime(pos) < 0)
                return true;
            // Reach end of recording, go to offset before the end
            dest = -kSeekToEndOffset;
        }
        uint64_t target = FindFrame(dest, true);
        m_ffTime = target - m_framesPlayed;
    }
    return m_ffTime > CalcMaxFFTime(m_ffTime, false);
}
 
bool MythPlayer::Rewind(float seconds)
{
    if (!m_videoOutput)
        return false;
 
    if (m_rewindTime <= 0)
    {
        float current = ComputeSecs(m_framesPlayed, true);
        float dest = current - seconds;
        if (dest < 0)
        {
            auto msec = millisecondsFromFloat(seconds * 1000);
            int64_t pos = TranslatePositionMsToFrame(msec, false);
            if (CalcRWTime(pos) < 0)
                return true;
            dest = 0;
        }
        uint64_t target = FindFrame(dest, true);
        m_rewindTime = m_framesPlayed - target;
    }
    return (uint64_t)m_rewindTime >= m_framesPlayed;
}
 
bool MythPlayer::JumpToFrame(uint64_t frame)
{
    if (!m_videoOutput)
        return false;
 
    bool ret = false;
    m_ffTime = m_rewindTime = 0;
    if (frame > m_framesPlayed)
    {
        m_ffTime = frame - m_framesPlayed;
        ret = m_ffTime > CalcMaxFFTime(m_ffTime, false);
    }
    else if (frame < m_framesPlayed)
    {
        m_rewindTime = m_framesPlayed - frame;
        ret = m_ffTime > CalcMaxFFTime(m_ffTime, false);
    }
    return ret;
}
 
 
void MythPlayer::JumpChapter(int chapter)
{
    if (m_jumpChapter == 0)
        m_jumpChapter = chapter;
}
 
void MythPlayer::ResetPlaying(bool resetframes)
{
    ClearAfterSeek();
    m_ffrewSkip = 1;
    if (resetframes)
        m_framesPlayed = 0;
    if (m_decoder)
    {
        m_decoder->Reset(true, true, true);
        if (m_decoder->IsErrored())
            SetErrored("Unable to reset video decoder");
    }
}
 
void MythPlayer::CheckTVChain(void)
{
    bool last = !(m_playerCtx->m_tvchain->HasNext());
    SetWatchingRecording(last);
}
 
// This is called from decoder thread. Set an indicator that will
// be checked and actioned in the player thread.
void MythPlayer::FileChangedCallback(void)
{
    LOG(VB_PLAYBACK, LOG_INFO, LOC + "FileChangedCallback");
    m_fileChanged = true;
}
 
void MythPlayer::StopPlaying()
{
    LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("StopPlaying - begin"));
    m_playerThread->setPriority(QThread::NormalPriority);
#ifdef Q_OS_ANDROID
    setpriority(PRIO_PROCESS, m_playerThreadId, 0);
#endif
 
    emit CheckCallbacks();
    DecoderEnd();
    VideoEnd();
    AudioEnd();
 
    LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("StopPlaying - end"));
}
 
void MythPlayer::AudioEnd(void)
{
    m_audio.DeleteOutput();
}
 
bool MythPlayer::PauseDecoder(void)
{
    m_decoderPauseLock.lock();
    if (is_current_thread(m_decoderThread))
    {
        m_decoderPaused = true;
        m_decoderThreadPause.wakeAll();
        m_decoderPauseLock.unlock();
        return m_decoderPaused;
    }
 
    int tries = 0;
    m_pauseDecoder = true;
    while (m_decoderThread && !m_killDecoder && (tries++ < 100) &&
           !m_decoderThreadPause.wait(&m_decoderPauseLock, 100))
    {
        emit CheckCallbacks();
        LOG(VB_GENERAL, LOG_WARNING, LOC + "Waited 100ms for decoder to pause");
    }
    m_pauseDecoder = false;
    m_decoderPauseLock.unlock();
    return m_decoderPaused;
}
 
void MythPlayer::UnpauseDecoder(void)
{
    m_decoderPauseLock.lock();
 
    if (is_current_thread(m_decoderThread))
    {
        m_decoderPaused = false;
        m_decoderThreadUnpause.wakeAll();
        m_decoderPauseLock.unlock();
        return;
    }
 
    if (!IsInStillFrame())
    {
        int tries = 0;
        m_unpauseDecoder = true;
        while (m_decoderThread && !m_killDecoder && (tries++ < 100) &&
               !m_decoderThreadUnpause.wait(&m_decoderPauseLock, 100))
        {
            emit CheckCallbacks();
            LOG(VB_GENERAL, LOG_WARNING, LOC + "Waited 100ms for decoder to unpause");
        }
        m_unpauseDecoder = false;
    }
    m_decoderPauseLock.unlock();
}
 
void MythPlayer::DecoderStart(bool start_paused)
{
    if (m_decoderThread)
    {
        if (m_decoderThread->isRunning())
        {
            LOG(VB_GENERAL, LOG_ERR, LOC + "Decoder thread already running");
        }
        delete m_decoderThread;
    }
 
    m_killDecoder = false;
    m_decoderPaused = start_paused;
    m_decoderThread = new MythDecoderThread(this, start_paused);
    if (m_decoderThread)
        m_decoderThread->start();
}
 
void MythPlayer::DecoderEnd(void)
{
    PauseDecoder();
    SetPlaying(false);
    // Ensure any hardware frames are released (after pausing the decoder) to
    // allow the decoder to exit cleanly
    DiscardVideoFrames(true, true);
 
    m_killDecoder = true;
    int tries = 0;
    while (m_decoderThread && !m_decoderThread->wait(100ms) && (tries++ < 50))
        LOG(VB_PLAYBACK, LOG_INFO, LOC +
            "Waited 100ms for decoder loop to stop");
 
    if (m_decoderThread && m_decoderThread->isRunning())
        LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to stop decoder loop.");
    else
        LOG(VB_PLAYBACK, LOG_INFO, LOC + "Exited decoder loop.");
    SetDecoder(nullptr);
}
 
void MythPlayer::DecoderPauseCheck(void)
{
    if (is_current_thread(m_decoderThread))
    {
        if (m_pauseDecoder)
            PauseDecoder();
        if (m_unpauseDecoder)
            UnpauseDecoder();
    }
}
 
EofState MythPlayer::GetEof(void) const
{
    if (is_current_thread(m_playerThread))
        return m_decoder ? m_decoder->GetEof() : kEofStateImmediate;
 
    if (!m_decoderChangeLock.tryLock(50))
        return kEofStateNone;
 
    EofState eof = m_decoder ? m_decoder->GetEof() : kEofStateImmediate;
    m_decoderChangeLock.unlock();
    return eof;
}
 
void MythPlayer::SetEof(EofState eof)
{
    if (is_current_thread(m_playerThread))
    {
        if (m_decoder)
            m_decoder->SetEofState(eof);
        return;
    }
 
    if (!m_decoderChangeLock.tryLock(50))
        return;
 
    if (m_decoder)
        m_decoder->SetEofState(eof);
    m_decoderChangeLock.unlock();
}
 
void MythPlayer::DecoderLoop(bool pause)
{
    if (pause)
        PauseDecoder();
 
    while (!m_killDecoder && !IsErrored())
    {
        DecoderPauseCheck();
 
        if (m_totalDecoderPause || m_inJumpToProgramPause)
        {
            std::this_thread::sleep_for(1ms);
            continue;
        }
 
        if (m_forcePositionMapSync)
        {
            if (!m_decoderChangeLock.tryLock(1))
                continue;
            if (m_decoder)
            {
                m_forcePositionMapSync = false;
                m_decoder->SyncPositionMap();
            }
            m_decoderChangeLock.unlock();
        }
 
        if (m_decoderSeek >= 0)
        {
            if (!m_decoderChangeLock.tryLock(1))
                continue;
            if (m_decoder)
            {
                m_decoderSeekLock.lock();
                if (((uint64_t)m_decoderSeek < m_framesPlayed) && m_decoder)
                    m_decoder->DoRewind(m_decoderSeek);
                else if (m_decoder)
                    m_decoder->DoFastForward(m_decoderSeek, !m_transcoding);
                m_decoderSeek = -1;
                m_decoderSeekLock.unlock();
            }
            m_decoderChangeLock.unlock();
        }
 
        bool obey_eof = (GetEof() != kEofStateNone) &&
                        (!m_playerCtx->m_tvchain || m_allPaused);
        if (m_isDummy || ((m_decoderPaused || m_ffrewSkip == 0 || obey_eof) &&
                          !m_decodeOneFrame))
        {
            std::this_thread::sleep_for(1ms);
            continue;
        }
 
        DecodeType dt = m_deleteMap.IsEditing() || (m_audio.HasAudioOut() && m_normalSpeed) ?
            kDecodeAV : kDecodeVideo;
 
        DecoderGetFrame(dt);
    }
 
    // Clear any wait conditions
    DecoderPauseCheck();
    m_decoderSeek = -1;
}
 
static float ffrewScaleAdjust = 0.10F;
static float ffrewSkipThresh = 0.60F;
static float ffrewScaleLowest = 1.00F;
static float ffrewScaleHighest = 2.50F;
 
void MythPlayer::DoFFRewSkip(void)
{
    if (!m_decoder)
        return;
 
    if (m_ffrewSkip > 0)
    {
        long long delta = m_decoder->GetFramesRead() - m_framesPlayed;
        long long real_skip = CalcMaxFFTime(m_ffrewSkip - m_ffrewAdjust + delta) - delta;
        long long target_frame = m_decoder->GetFramesRead() + real_skip;
        if (real_skip >= 0)
            m_decoder->DoFastForward(target_frame, m_ffrewUseRenderOne);
 
        long long seek_frame = m_decoder->GetFramesRead();
        m_ffrewAdjust = seek_frame - target_frame;
        float adjustRatio = float(m_ffrewAdjust) / m_ffrewSkip;
        LOG(VB_PLAYBACK, LOG_INFO, LOC +
            QString("skip %1, adjust %2, ratio %3")
            .arg(m_ffrewSkip).arg(m_ffrewAdjust).arg(adjustRatio));
 
        // If the needed adjustment is too large either way, adjust
        // the scale factor up or down accordingly.
        if (adjustRatio > ffrewSkipThresh
            && m_ffrewScale < (ffrewScaleHighest - 0.01F))
            UpdateFFRewSkip(m_ffrewScale + ffrewScaleAdjust);
        else if (adjustRatio  < -ffrewSkipThresh
                 && m_ffrewScale > (ffrewScaleLowest + 0.01F))
            UpdateFFRewSkip(m_ffrewScale - ffrewScaleAdjust);
    }
    else if (CalcRWTime(-m_ffrewSkip) >= 0)
    {
        long long cur_frame    = m_decoder->GetFramesPlayed();
        bool      toBegin      = -cur_frame > m_ffrewSkip + m_ffrewAdjust;
        long long real_skip    = (toBegin) ? -cur_frame : m_ffrewSkip + m_ffrewAdjust;
        long long target_frame = cur_frame + real_skip;
        m_decoder->DoRewind(target_frame, m_ffrewUseRenderOne);
 
        long long seek_frame  = m_decoder->GetFramesPlayed();
        m_ffrewAdjust = target_frame - seek_frame;
        float adjustRatio = float(m_ffrewAdjust) / m_ffrewSkip;
        LOG(VB_PLAYBACK, LOG_INFO, LOC +
            QString("skip %1, adjust, %2, ratio %3")
            .arg(m_ffrewSkip).arg(m_ffrewAdjust).arg(adjustRatio));
 
        // If the needed adjustment is too large either way, adjust the
        // scale factor up or down accordingly.
        if (adjustRatio < -ffrewSkipThresh
            && m_ffrewScale < (ffrewScaleHighest - 0.01F))
            UpdateFFRewSkip(m_ffrewScale + ffrewScaleAdjust);
        else if (adjustRatio  > ffrewSkipThresh
                 && m_ffrewScale > (ffrewScaleLowest + 0.01F))
            UpdateFFRewSkip(m_ffrewScale - ffrewScaleAdjust);
    }
 
    LOG(VB_PLAYBACK, LOG_DEBUG, "Setting decode one");
    m_decodeOneFrame = true;
}
 
bool MythPlayer::DecoderGetFrame(DecodeType decodetype, bool unsafe)
{
    bool ret = false;
    if (!m_videoOutput)
        return false;
 
    // Wait for frames to be available for decoding onto
    int tries = 0;
    while (!unsafe && (!m_videoOutput->EnoughFreeFrames() || m_audio.IsBufferAlmostFull()))
    {
        if (m_killDecoder || m_pauseDecoder)
            return false;
 
        if (++tries > 10)
        {
            if (++m_videobufRetries >= 2000)
            {
                LOG(VB_GENERAL, LOG_ERR, LOC +
                    "Decoder timed out waiting for free video buffers.");
                // We've tried for 20 seconds now, give up so that we don't
                // get stuck permanently in this state
                SetErrored("Decoder timed out waiting for free video buffers.");
            }
            return false;
        }
        std::this_thread::sleep_for(1ms);
    }
    m_videobufRetries = 0;
 
    if (!m_decoderChangeLock.tryLock(5))
        return false;
    if (m_killDecoder || !m_decoder || m_pauseDecoder || IsErrored())
    {
        m_decoderChangeLock.unlock();
        return false;
    }
 
    if (abs(m_ffrewSkip) > 1 && !m_decodeOneFrame && !m_renderOneFrame)
        DoFFRewSkip();
 
    if ((abs(m_ffrewSkip) > 0 || m_decodeOneFrame) && !m_renderOneFrame)
        ret = DoGetFrame(decodetype);
 
    m_decoderChangeLock.unlock();
    return ret;
}
 
bool MythPlayer::DoGetFrame(DecodeType Type)
{
    bool retry = false;
    bool ret = m_decoder->GetFrame(Type, retry);
    if (retry)
    {
        // Delay here so we don't spin too fast.
        m_decoderChangeLock.unlock();
        std::this_thread::sleep_for(1ms);
        m_decoderChangeLock.lock();
        return false;
    }
    return ret;
}
 
void MythPlayer::WrapTimecode(std::chrono::milliseconds &timecode, TCTypes tc_type)
{
    timecode += m_tcWrap[tc_type];
}
 
bool MythPlayer::PrepareAudioSample(std::chrono::milliseconds &timecode)
{
    WrapTimecode(timecode, TC_AUDIO);
    return false;
}
 
uint64_t MythPlayer::GetBookmark(void)
{
    uint64_t bookmark = 0;
 
    if (gCoreContext->IsDatabaseIgnored() ||
        (m_playerCtx->m_buffer && !m_playerCtx->m_buffer->IsBookmarkAllowed()))
        bookmark = 0;
    else
    {
        m_playerCtx->LockPlayingInfo(__FILE__, __LINE__);
        if (const ProgramInfo *pi = m_playerCtx->m_playingInfo)
            bookmark = pi->QueryStartMark();
        m_playerCtx->UnlockPlayingInfo(__FILE__, __LINE__);
    }
 
    return bookmark;
}
 
bool MythPlayer::UpdateFFRewSkip(float ffrewScale)
{
    bool skip_changed = false;
 
    float temp_speed = (m_playSpeed == 0.0F) ?
        m_audio.GetStretchFactor() : m_playSpeed;
    if (m_playSpeed >= 0.0F && m_playSpeed <= 3.0F)
    {
        skip_changed = (m_ffrewSkip != 1);
        if (m_decoder)
            m_fpsMultiplier = m_decoder->GetfpsMultiplier();
        m_frameInterval = microsecondsFromFloat((1000000.0 / m_videoFrameRate / static_cast<double>(temp_speed))
           / m_fpsMultiplier);
        m_ffrewSkip = static_cast<int>(m_playSpeed != 0.0F);
        LOG(VB_PLAYBACK, LOG_DEBUG, LOC + "Clearing render one");
    }
    else
    {
        skip_changed = true;
        m_ffrewScale = ffrewScale;
        if (fabs(m_playSpeed) <= 10.0F)
            m_frameInterval = 200000us; // 5.00 fps
        else if (fabs(m_playSpeed) <= 20.0F)
            m_frameInterval = 166667us; // 6.00 fps
        else
            m_frameInterval = 150000us; // 6.67 fps
        m_frameInterval = chronomult(m_frameInterval, m_ffrewScale);
        float ffw_fps = fabs(static_cast<double>(m_playSpeed)) * m_videoFrameRate;
        float dis_fps = 1000000.0F / m_frameInterval.count();
        m_ffrewSkip = (int)ceil(ffw_fps / dis_fps);
        m_ffrewSkip = m_playSpeed < 0.0F ? -m_ffrewSkip : m_ffrewSkip;
        LOG(VB_PLAYBACK, LOG_INFO, LOC +
            QString("new skip %1, interval %2, scale %3")
            .arg(m_ffrewSkip).arg(m_frameInterval.count()).arg(m_ffrewScale));
        m_ffrewAdjust = 0;
    }
 
    return skip_changed;
}
 
void MythPlayer::ChangeSpeed(void)
{
    float last_speed = m_playSpeed;
    m_playSpeed   = m_nextPlaySpeed;
    m_normalSpeed = m_nextNormalSpeed;
    m_avSync.ResetAVSyncClockBase();
 
    bool skip_changed = UpdateFFRewSkip();
 
    if (skip_changed && m_videoOutput)
    {
        m_videoOutput->SetPrebuffering(m_ffrewSkip == 1);
        if (m_playSpeed != 0.0F && (last_speed != 0.0F || m_ffrewSkip != 1))
            DoJumpToFrame(m_framesPlayed + m_ffTime - m_rewindTime, kInaccuracyFull);
    }
 
    LOG(VB_PLAYBACK, LOG_INFO, LOC + "Play speed: " +
        QString("rate: %1 speed: %2 skip: %3 => new interval %4")
        .arg(m_videoFrameRate).arg(static_cast<double>(m_playSpeed))
        .arg(m_ffrewSkip).arg(m_frameInterval.count()));
 
    if (m_videoOutput)
        m_videoOutput->SetVideoFrameRate(static_cast<float>(m_videoFrameRate));
 
    if (m_normalSpeed && m_audio.HasAudioOut())
    {
        m_audio.SetStretchFactor(m_playSpeed);
        syncWithAudioStretch();
    }
}
 
bool MythPlayer::DoRewind(uint64_t frames, double inaccuracy)
{
    if (m_playerCtx->m_buffer && !m_playerCtx->m_buffer->IsSeekingAllowed())
        return false;
 
    uint64_t number = frames + 1;
    uint64_t desiredFrame = (m_framesPlayed > number) ? m_framesPlayed - number : 0;
 
    m_limitKeyRepeat = false;
    if (desiredFrame < m_videoFrameRate)
        m_limitKeyRepeat = true;
 
    uint64_t seeksnap_wanted = UINT64_MAX;
    if (inaccuracy != kInaccuracyFull)
        seeksnap_wanted = frames * inaccuracy;
    WaitForSeek(desiredFrame, seeksnap_wanted);
    m_rewindTime = 0;
    ClearAfterSeek();
    return true;
}
 
long long MythPlayer::CalcRWTime(long long rw) const
{
    bool hasliveprev = (m_liveTV && m_playerCtx->m_tvchain &&
                        m_playerCtx->m_tvchain->HasPrev());
 
    if (!hasliveprev || ((int64_t)m_framesPlayed >= rw))
    {
        return rw;
    }
 
    auto seconds = secondsFromFloat(((int64_t)m_framesPlayed - rw) / m_videoFrameRate);
    m_playerCtx->m_tvchain->JumpToNext(false, seconds);
 
    return -1;
}
 
long long MythPlayer::CalcMaxFFTime(long long ffframes, bool setjump) const
{
    float maxtime = kSeekToEndOffset;
    bool islivetvcur = (m_liveTV && m_playerCtx->m_tvchain &&
                        !m_playerCtx->m_tvchain->HasNext());
 
    long long ret       = ffframes;
    float ff            = ComputeSecs(ffframes, true);
    float secsPlayed    = ComputeSecs(m_framesPlayed, true);
    float secsWritten   = ComputeSecs(m_totalFrames, true);
 
    m_limitKeyRepeat = false;
 
    if (m_liveTV && !islivetvcur && m_playerCtx->m_tvchain)
    {
        // recording has completed, totalFrames will always be up to date
        if ((ffframes + m_framesPlayed > m_totalFrames) && setjump)
        {
            ret = -1;
            // Number of frames to be skipped is from the end of the current segment
            int64_t frames = (int64_t)m_totalFrames - (int64_t)m_framesPlayed - ffframes;
            auto seconds = secondsFromFloat(frames / m_videoFrameRate);
            m_playerCtx->m_tvchain->JumpToNext(true, seconds);
        }
    }
    else if (islivetvcur || IsWatchingInprogress())
    {
        if ((ff + secsPlayed) > secsWritten)
        {
            // If we attempt to seek past the last known duration,
            // check for up to date data
            long long framesWritten = m_playerCtx->m_recorder->GetFramesWritten();
 
            secsWritten = ComputeSecs(framesWritten, true);
        }
 
        float behind = secsWritten - secsPlayed;
 
        if (behind < maxtime) // if we're close, do nothing
            ret = 0;
        else if (behind - ff <= maxtime)
        {
            auto msec = millisecondsFromFloat(1000 * (secsWritten - maxtime));
            ret = TranslatePositionMsToFrame(msec, true) - m_framesPlayed;
        }
 
        if (behind < maxtime * 3)
            m_limitKeyRepeat = true;
    }
    else if (IsPaused())
    {
        uint64_t lastFrame =
            m_deleteMap.IsEmpty() ? m_totalFrames : m_deleteMap.GetLastFrame();
        if (m_framesPlayed + ffframes >= lastFrame)
            ret = lastFrame - 1 - m_framesPlayed;
    }
    else
    {
        float secsMax = secsWritten - 2.F * maxtime;
        if (secsMax <= 0.F)
            ret = 0;
        else if (secsMax < secsPlayed + ff)
        {
            auto msec = millisecondsFromFloat(1000 * secsMax);
            ret = TranslatePositionMsToFrame(msec, true) - m_framesPlayed;
        }
    }
 
    return ret;
}
 
bool MythPlayer::IsReallyNearEnd(void) const
{
    if (!m_videoOutput || !m_decoder)
        return false;
 
    return m_playerCtx->m_buffer->IsNearEnd(
        m_decoder->GetFPS(), m_videoOutput->ValidVideoFrames());
}
 
bool MythPlayer::IsNearEnd(void)
{
    if (!m_playerCtx)
        return false;
 
    m_playerCtx->LockPlayingInfo(__FILE__, __LINE__);
    if (!m_playerCtx->m_playingInfo || m_playerCtx->m_playingInfo->IsVideo() ||
        !m_decoder)
    {
        m_playerCtx->UnlockPlayingInfo(__FILE__, __LINE__);
        return false;
    }
    m_playerCtx->UnlockPlayingInfo(__FILE__, __LINE__);
 
    auto margin = (long long)(m_videoFrameRate * 2);
    margin = (long long) (margin * m_audio.GetStretchFactor());
    bool watchingTV = IsWatchingInprogress();
 
    uint64_t framesRead = m_framesPlayed;
    uint64_t framesLeft = 0;
 
    if (m_playerCtx->GetState() == kState_WatchingPreRecorded)
    {
        if (framesRead >= m_deleteMap.GetLastFrame())
            return true;
        uint64_t frameCount = GetCurrentFrameCount();
        framesLeft = (frameCount > framesRead) ? frameCount - framesRead : 0;
        return (framesLeft < (uint64_t)margin);
    }
 
    if (!m_liveTV && !watchingTV)
        return false;
 
    if (m_liveTV && m_playerCtx->m_tvchain && m_playerCtx->m_tvchain->HasNext())
        return false;
 
    if (m_playerCtx->m_recorder)
    {
        framesLeft =
            m_playerCtx->m_recorder->GetCachedFramesWritten() - framesRead;
 
        // if it looks like we are near end, get an updated GetFramesWritten()
        if (framesLeft < (uint64_t)margin)
            framesLeft = m_playerCtx->m_recorder->GetFramesWritten() - framesRead;
    }
 
    return (framesLeft < (uint64_t)margin);
}
 
bool MythPlayer::DoFastForward(uint64_t frames, double inaccuracy)
{
    if (m_playerCtx->m_buffer && !m_playerCtx->m_buffer->IsSeekingAllowed())
        return false;
 
    uint64_t number = (frames ? frames - 1 : 0);
    uint64_t desiredFrame = m_framesPlayed + number;
 
    if (!m_deleteMap.IsEditing() && IsInDelete(desiredFrame))
    {
        uint64_t endcheck = m_deleteMap.GetLastFrame();
        if (desiredFrame > endcheck)
            desiredFrame = endcheck;
    }
 
    uint64_t seeksnap_wanted = UINT64_MAX;
    if (inaccuracy != kInaccuracyFull)
        seeksnap_wanted = frames * inaccuracy;
    WaitForSeek(desiredFrame, seeksnap_wanted);
    m_ffTime = 0;
    ClearAfterSeek(false);
    return true;
}
 
void MythPlayer::DoJumpToFrame(uint64_t frame, double inaccuracy)
{
    if (frame > m_framesPlayed)
        DoFastForward(frame - m_framesPlayed, inaccuracy);
    else
        DoRewind(m_framesPlayed - frame, inaccuracy);
}
 
void MythPlayer::WaitForSeek(uint64_t frame, uint64_t seeksnap_wanted)
{
    if (!m_decoder)
        return;
 
    SetEof(kEofStateNone);
    m_decoder->SetSeekSnap(seeksnap_wanted);
 
    bool islivetvcur = (m_liveTV && m_playerCtx->m_tvchain &&
                        !m_playerCtx->m_tvchain->HasNext());
 
    uint64_t max = GetCurrentFrameCount();
    if (islivetvcur || IsWatchingInprogress())
    {
        max = (uint64_t)m_playerCtx->m_recorder->GetFramesWritten();
    }
    if (frame >= max)
        frame = max - 1;
 
    m_decoderSeekLock.lock();
    m_decoderSeek = frame;
    m_decoderSeekLock.unlock();
 
    int count = 0;
    bool needclear = false;
    while (m_decoderSeek >= 0)
    {
        // Waiting blocks the main UI thread but the decoder may
        // have initiated a callback into the UI thread to create
        // certain resources. Ensure the callback is processed.
        // Ideally MythPlayer should be fully event driven and these
        // calls wouldn't be necessary.
        emit CheckCallbacks();
 
        // Wait a little
        std::this_thread::sleep_for(50ms);
 
        // provide some on screen feedback if seeking is slow
        count++;
        if (!(count % 3) && !m_hasFullPositionMap)
        {
            emit SeekingSlow(count);
            needclear = true;
        }
    }
    if (needclear)
        emit SeekingComplete();
 
    emit SeekingDone();
}
 
void MythPlayer::ClearAfterSeek(bool clearvideobuffers)
{
    LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("ClearAfterSeek(%1)")
            .arg(clearvideobuffers));
 
    if (clearvideobuffers && m_videoOutput)
        m_videoOutput->ClearAfterSeek();
 
    std::chrono::milliseconds savedTC = m_tcWrap[TC_AUDIO];
 
    m_tcWrap.fill(0ms);
    m_tcWrap[TC_AUDIO] = savedTC;
    m_audio.Reset();
 
    emit RequestResetCaptions();
    m_deleteMap.TrackerReset(m_framesPlayed);
    m_commBreakMap.SetTracker(m_framesPlayed);
    m_commBreakMap.ResetLastSkip();
    m_needNewPauseFrame = true;
 
    m_avSync.InitAVSync();
}
 
bool MythPlayer::IsInDelete(uint64_t frame)
{
    return m_deleteMap.IsInDelete(frame);
}
 
bool MythPlayer::HasTVChainNext(void) const
{
    return m_playerCtx->m_tvchain && m_playerCtx->m_tvchain->HasNext();
}
 
QString MythPlayer::GetEncodingType(void) const
{
    if (m_decoder)
        return get_encoding_type(m_decoder->GetVideoCodecID());
    return {};
}
 
bool MythPlayer::GetRawAudioState(void) const
{
    if (m_decoder)
        return m_decoder->GetRawAudioState();
    return false;
}
 
QString MythPlayer::GetXDS(const QString &key) const
{
    if (!m_decoder)
        return {};
    return m_decoder->GetXDS(key);
}
 
void MythPlayer::SetCommBreakMap(const frm_dir_map_t& NewMap)
{
    m_commBreakMap.SetMap(NewMap, m_framesPlayed);
    m_forcePositionMapSync = true;
}
 
// Returns the total frame count, as totalFrames for a completed
// recording, or the most recent frame count from the recorder for
// live TV or an in-progress recording.
uint64_t MythPlayer::GetCurrentFrameCount(void) const
{
    uint64_t result = m_totalFrames;
    if (IsWatchingInprogress())
        result = m_playerCtx->m_recorder->GetFramesWritten();
    return result;
}
 
// Finds the frame number associated with the given time offset.  A
// positive offset or +0.0F indicate offset from the beginning.  A
// negative offset or -0.0F indicate offset from the end.  Limit the
// result to within bounds of the video.
uint64_t MythPlayer::FindFrame(float offset, bool use_cutlist) const
{
    bool islivetvcur    = (m_liveTV && m_playerCtx->m_tvchain &&
                        !m_playerCtx->m_tvchain->HasNext());
    std::chrono::milliseconds length_ms = TranslatePositionFrameToMs(m_totalFrames, use_cutlist);
    std::chrono::milliseconds position_ms = 0ms;
    auto offset_ms = std::chrono::milliseconds(llroundf(fabsf(offset) * 1000));
 
    if (signbit(offset))
    {
        // Always get an updated totalFrame value for in progress recordings
        if (islivetvcur || IsWatchingInprogress())
        {
            uint64_t framesWritten = m_playerCtx->m_recorder->GetFramesWritten();
 
            if (m_totalFrames < framesWritten)
            {
                // Known duration is less than what the backend reported, use new value
                length_ms =
                    TranslatePositionFrameToMs(framesWritten, use_cutlist);
            }
        }
        position_ms = (offset_ms > length_ms) ? 0ms : length_ms - offset_ms;
    }
    else
    {
        position_ms = offset_ms;
        if (offset_ms > length_ms)
        {
            // Make sure we have an updated totalFrames
            if ((islivetvcur || IsWatchingInprogress()) &&
                (length_ms < offset_ms))
            {
                long long framesWritten =
                    m_playerCtx->m_recorder->GetFramesWritten();
 
                length_ms =
                    TranslatePositionFrameToMs(framesWritten, use_cutlist);
            }
            position_ms = std::min(position_ms, length_ms);
        }
    }
    return TranslatePositionMsToFrame(position_ms, use_cutlist);
}
 
// If position == -1, it signifies that we are computing the current
// duration of an in-progress recording.  In this case, we fetch the
// current frame rate and frame count from the recorder.
std::chrono::milliseconds MythPlayer::TranslatePositionFrameToMs(uint64_t position,
                                                bool use_cutlist) const
{
    float frameRate = GetFrameRate();
    if (position == UINT64_MAX &&
        m_playerCtx->m_recorder && m_playerCtx->m_recorder->IsValidRecorder())
    {
        float recorderFrameRate = m_playerCtx->m_recorder->GetFrameRate();
        if (recorderFrameRate > 0)
            frameRate = recorderFrameRate;
        position = m_playerCtx->m_recorder->GetFramesWritten();
    }
    return m_deleteMap.TranslatePositionFrameToMs(position, frameRate,
                                                use_cutlist);
}
 
int MythPlayer::GetNumChapters()
{
    if (m_decoder)
        return m_decoder->GetNumChapters();
    return 0;
}
 
int MythPlayer::GetCurrentChapter()
{
    if (m_decoder)
        return m_decoder->GetCurrentChapter(m_framesPlayed);
    return 0;
}
 
void MythPlayer::GetChapterTimes(QList<std::chrono::seconds> &times)
{
    if (m_decoder)
        m_decoder->GetChapterTimes(times);
}
 
bool MythPlayer::DoJumpChapter(int chapter)
{
    int64_t desiredFrame = -1;
    int total = GetNumChapters();
    int current = GetCurrentChapter();
 
    if (chapter < 0 || chapter > total)
    {
 
        if (chapter < 0)
        {
            chapter = current -1;
            if (chapter < 0) chapter = 0;
        }
        else if (chapter > total)
        {
            chapter = current + 1;
            if (chapter > total) chapter = total;
        }
    }
 
    desiredFrame = GetChapter(chapter);
    LOG(VB_PLAYBACK, LOG_INFO, LOC +
        QString("DoJumpChapter: current %1 want %2 (frame %3)")
            .arg(current).arg(chapter).arg(desiredFrame));
 
    if (desiredFrame < 0)
    {
        LOG(VB_PLAYBACK, LOG_ERR, LOC + QString("DoJumpChapter failed."));
        m_jumpChapter = 0;
        return false;
    }
 
    DoJumpToFrame(desiredFrame, kInaccuracyNone);
    m_jumpChapter = 0;
    return true;
}
 
int64_t MythPlayer::GetChapter(int chapter)
{
    if (m_decoder)
        return m_decoder->GetChapter(chapter);
    return 0;
}
 
void MythPlayer::SetDecoder(DecoderBase *dec)
{
    m_totalDecoderPause = true;
    PauseDecoder();
 
    {
        while (!m_decoderChangeLock.tryLock(10))
            LOG(VB_GENERAL, LOG_INFO, LOC + "Waited 10ms for decoder lock");
        delete m_decoder;
        m_decoder = dec;
        if (m_decoder)
            m_decoder->SetRenderFormats(m_renderFormats);
        m_decoderChangeLock.unlock();
    }
    // reset passthrough override
    m_disablePassthrough = false;
    syncWithAudioStretch();
    m_totalDecoderPause = false;
}
 
bool MythPlayer::PosMapFromEnc(uint64_t start,
                               frm_pos_map_t &posMap,
                               frm_pos_map_t &durMap)
{
    // Reads only new positionmap entries from encoder
    if (!(m_liveTV || (m_playerCtx->m_recorder &&
                     m_playerCtx->m_recorder->IsValidRecorder())))
        return false;
 
    // if livetv, and we're not the last entry, don't get it from the encoder
    if (HasTVChainNext())
        return false;
 
    LOG(VB_PLAYBACK, LOG_INFO, LOC +
        QString("Filling position map from %1 to %2") .arg(start).arg("end"));
 
    m_playerCtx->m_recorder->FillPositionMap(start, -1, posMap);
    m_playerCtx->m_recorder->FillDurationMap(start, -1, durMap);
 
    return true;
}
 
void MythPlayer::SetErrored(const QString &reason)
{
    QMutexLocker locker(&m_errorLock);
 
    if (m_videoOutput)
        m_errorType |= m_videoOutput->GetError();
 
    if (m_errorMsg.isEmpty())
    {
        m_errorMsg = reason;
    }
    else
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + QString("%1").arg(reason));
    }
}
 
void MythPlayer::ResetErrored(void)
{
    QMutexLocker locker(&m_errorLock);
 
    m_errorMsg = QString();
}
 
bool MythPlayer::IsErrored(void) const
{
    QMutexLocker locker(&m_errorLock);
    return !m_errorMsg.isEmpty();
}
 
QString MythPlayer::GetError(void) const
{
    QMutexLocker locker(&m_errorLock);
    return m_errorMsg;
}
 
void MythPlayer::SaveTotalDuration(void)
{
    if (!m_decoder)
        return;
 
    m_decoder->SaveTotalDuration();
}
 
void MythPlayer::ResetTotalDuration(void)
{
    if (!m_decoder)
        return;
 
    m_decoder->ResetTotalDuration();
}
 
void MythPlayer::SaveTotalFrames(void)
{
    if (!m_decoder)
        return;
 
    m_decoder->SaveTotalFrames();
}
 
void MythPlayer::syncWithAudioStretch()
{
    if (m_decoder && m_audio.HasAudioOut())
    {
        float stretch = m_audio.GetStretchFactor();
        m_disablePassthrough |= (stretch < 0.99F) || (stretch > 1.01F);
        LOG(VB_PLAYBACK, LOG_INFO, LOC +
            QString("Stretch Factor %1, %2 passthru ")
            .arg(m_audio.GetStretchFactor())
            .arg((m_disablePassthrough) ? "disable" : "allow"));
        SetDisablePassThrough(m_disablePassthrough);
    }
}
 
void MythPlayer::SetDisablePassThrough(bool disabled)
{
    if (m_decoder && m_audio.HasAudioOut())
        m_decoder->SetDisablePassThrough(m_disablePassthrough || disabled);
}
 
void MythPlayer::ForceSetupAudioStream(void)
{
    if (m_decoder && m_audio.HasAudioOut())
        m_decoder->ForceSetupAudioStream();
}
 
static unsigned dbg_ident(const MythPlayer *player)
{
    static QMutex   s_dbgLock;
    static unsigned s_dbgNextIdent = 0;
    using DbgMapType = QHash<const MythPlayer*, unsigned>;
    static DbgMapType s_dbgIdent;
 
    QMutexLocker locker(&s_dbgLock);
    DbgMapType::iterator it = s_dbgIdent.find(player);
    if (it != s_dbgIdent.end())
        return *it;
    return s_dbgIdent[player] = s_dbgNextIdent++;
}