LaserdiscPlayer.cc

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#include "LaserdiscPlayer.hh"
#include "CommandException.hh"
#include "CommandController.hh"
#include "EventDistributor.hh"
#include "FileContext.hh"
#include "DeviceConfig.hh"
#include "HardwareConfig.hh"
#include "XMLElement.hh"
#include "CassettePort.hh"
#include "CliComm.hh"
#include "Display.hh"
#include "GlobalSettings.hh"
#include "Reactor.hh"
#include "ReverseManager.hh"
#include "MSXMotherBoard.hh"
#include "PioneerLDControl.hh"
#include "LDRenderer.hh"
#include "RendererFactory.hh"
#include "Math.hh"
#include "one_of.hh"
#include <cstdint>
#include <cstdlib>
#include <iostream>
#include <memory>
 
using std::string;
 
namespace openmsx {
 
// Command
 
LaserdiscPlayer::Command::Command(
                CommandController& commandController_,
                StateChangeDistributor& stateChangeDistributor_,
                Scheduler& scheduler_)
        : RecordedCommand(commandController_, stateChangeDistributor_,
                          scheduler_, "laserdiscplayer")
{
}
 
void LaserdiscPlayer::Command::execute(
        std::span<const TclObject> tokens, TclObject& result, EmuTime::param time)
{
        auto& laserdiscPlayer = OUTER(LaserdiscPlayer, laserdiscCommand);
        if (tokens.size() == 1) {
                // Returning Tcl lists here, similar to the disk commands in
                // DiskChanger
                result.addListElement(tmpStrCat(getName(), ':'),
                                      laserdiscPlayer.getImageName().getResolved());
        } else if (tokens[1] == "eject") {
                checkNumArgs(tokens, 2, Prefix{2}, nullptr);
                result = "Ejecting laserdisc.";
                laserdiscPlayer.eject(time);
        } else if (tokens[1] == "insert") {
                checkNumArgs(tokens, 3, "filename");
                try {
                        result = "Changing laserdisc.";
                        laserdiscPlayer.setImageName(string(tokens[2].getString()), time);
                } catch (MSXException& e) {
                        throw CommandException(std::move(e).getMessage());
                }
        } else {
                throw SyntaxError();
        }
}
 
string LaserdiscPlayer::Command::help(std::span<const TclObject> tokens) const
{
        if (tokens.size() >= 2) {
                if (tokens[1] == "insert") {
                        return "Inserts the specified laserdisc image into "
                               "the laserdisc player.";
                } else if (tokens[1] == "eject") {
                        return "Eject the laserdisc.";
                }
        }
        return "laserdiscplayer insert <filename> "
               ": insert a (different) laserdisc image\n"
               "laserdiscplayer eject             "
               ": eject the laserdisc\n";
}
 
void LaserdiscPlayer::Command::tabCompletion(std::vector<string>& tokens) const
{
        if (tokens.size() == 2) {
                using namespace std::literals;
                static constexpr std::array extra = {"eject"sv, "insert"sv};
                completeString(tokens, extra);
        } else if (tokens.size() == 3 && tokens[1] == "insert") {
                completeFileName(tokens, userFileContext());
        }
}
 
// LaserdiscPlayer
 
constexpr unsigned DUMMY_INPUT_RATE = 44100; // actual rate depends on .ogg file
 
LaserdiscPlayer::LaserdiscPlayer(
                const HardwareConfig& hwConf, PioneerLDControl& ldControl_)
        : ResampledSoundDevice(hwConf.getMotherBoard(), "laserdiscplayer",
                               "Laserdisc Player", 1, DUMMY_INPUT_RATE, true)
        , syncAck (hwConf.getMotherBoard().getScheduler())
        , syncOdd (hwConf.getMotherBoard().getScheduler())
        , syncEven(hwConf.getMotherBoard().getScheduler())
        , motherBoard(hwConf.getMotherBoard())
        , ldControl(ldControl_)
        , laserdiscCommand(motherBoard.getCommandController(),
                           motherBoard.getStateChangeDistributor(),
                           motherBoard.getScheduler())
        , sampleClock(EmuTime::zero())
        , start(EmuTime::zero())
        , muteLeft(false)
        , muteRight(false)
        , remoteState(REMOTE_IDLE)
        , remoteLastEdge(EmuTime::zero())
        , remoteLastBit(false)
        , remoteProtocol(IR_NONE)
        , ack(false)
        , seeking(false)
        , playerState(PLAYER_STOPPED)
        , autoRunSetting(
                motherBoard.getCommandController(), "autorunlaserdisc",
                "automatically try to run Laserdisc", true)
        , loadingIndicator(
                motherBoard.getReactor().getGlobalSettings().getThrottleManager())
        , sampleReads(0)
{
        motherBoard.getCassettePort().setLaserdiscPlayer(this);
 
        Reactor& reactor = motherBoard.getReactor();
        reactor.getDisplay().attach(*this);
 
        createRenderer();
        reactor.getEventDistributor().registerEventListener(EventType::BOOT, *this);
        scheduleDisplayStart(getCurrentTime());
 
        static XMLElement* xml = [] {
                auto& doc = XMLDocument::getStaticDocument();
                auto* result = doc.allocateElement("laserdiscplayer");
                result->setFirstChild(doc.allocateElement("sound"))
                      ->setFirstChild(doc.allocateElement("volume", "30000"));
                return result;
        }();
        registerSound(DeviceConfig(hwConf, *xml));
}
 
LaserdiscPlayer::~LaserdiscPlayer()
{
        unregisterSound();
        Reactor& reactor = motherBoard.getReactor();
        reactor.getDisplay().detach(*this);
        reactor.getEventDistributor().unregisterEventListener(EventType::BOOT, *this);
}
 
void LaserdiscPlayer::scheduleDisplayStart(EmuTime::param time)
{
        Clock<60000, 1001> frameClock(time);
        // The video is 29.97Hz, however we need to do vblank processing
        // at the full 59.94Hz
        syncOdd .setSyncPoint(frameClock + 1);
        syncEven.setSyncPoint(frameClock + 2);
}
 
// The protocol used to communicate over the cable for commands to the
// laserdisc player is the NEC infrared protocol with minor deviations:
// 1) The leader pulse and space is a little shorter.
// 2) The remote does not send NEC repeats; full NEC codes are repeated
//    after 20ms. The main unit does not understand NEC repeats.
// 3) No carrier modulation is done over the ext protocol.
//
// My Laserdisc player is an Pioneer LD-700 which has a remote called
// the CU-700. This is much like the CU-CLD106 which is described
// here: http://lirc.sourceforge.net/remotes/pioneer/CU-CLD106
// The codes and protocol are exactly the same.
void LaserdiscPlayer::extControl(bool bit, EmuTime::param time)
{
        if (remoteLastBit == bit) return;
        remoteLastBit = bit;
 
        // The tolerance here is based on actual measurements of an LD-700
        EmuDuration duration = time - remoteLastEdge;
        remoteLastEdge = time;
        unsigned usec = duration.getTicksAt(1000000); // microseconds
 
        switch (remoteState) {
        case REMOTE_IDLE:
                if (bit) {
                        remoteBits = remoteBitNr = 0;
                        remoteState = REMOTE_HEADER_PULSE;
                }
                break;
        case REMOTE_HEADER_PULSE:
                if (5800 <= usec && usec < 11200) {
                        remoteState = NEC_HEADER_SPACE;
                } else {
                        remoteState = REMOTE_IDLE;
                }
                break;
        case NEC_HEADER_SPACE:
                if (3400 <= usec && usec < 6200) {
                        remoteState = NEC_BITS_PULSE;
                } else {
                        remoteState = REMOTE_IDLE;
                }
                break;
        case NEC_BITS_PULSE:
                if (usec >= 380 && usec < 1070) {
                        remoteState = NEC_BITS_SPACE;
                } else {
                        remoteState = REMOTE_IDLE;
                }
                break;
        case NEC_BITS_SPACE:
                if (1260 <= usec && usec < 4720) {
                        // bit 1
                        remoteBits |= 1 << remoteBitNr;
                } else if (usec < 300 || usec >= 1065) {
                        // error
                        remoteState = REMOTE_IDLE;
                        break;
                }
 
                // since it does not matter how long the trailing pulse
                // is, we process the button here. Note that real hardware
                // needs the trailing pulse to be at least 200µs
                if (++remoteBitNr == 32) {
                        byte custom      = ( remoteBits >>  0) & 0xff;
                        byte customCompl = (~remoteBits >>  8) & 0xff;
                        byte code        = ( remoteBits >> 16) & 0xff;
                        byte codeCompl   = (~remoteBits >> 24) & 0xff;
                        if (custom == customCompl &&
                            custom == 0xa8 &&
                            code == codeCompl) {
                                submitRemote(IR_NEC, code);
                        }
                        remoteState = REMOTE_IDLE;
                } else {
                        remoteState = NEC_BITS_PULSE;
                }
 
                break;
        }
}
 
void LaserdiscPlayer::submitRemote(RemoteProtocol protocol, unsigned code)
{
        // The END command for seeking/waiting acknowledges repeats,
        // Esh's Aurunmilla needs play as well.
        if (protocol != remoteProtocol || code != remoteCode ||
            (protocol == IR_NEC && (code == one_of(0x42u, 0x17u)))) {
                remoteProtocol = protocol;
                remoteCode = code;
                remoteVblanksBack = 0;
                remoteExecuteDelayed = true;
        } else {
                // remote ignored
                remoteVblanksBack = 0;
                remoteExecuteDelayed = false;
        }
}
 
const RawFrame* LaserdiscPlayer::getRawFrame() const
{
        return renderer->getRawFrame();
}
 
void LaserdiscPlayer::setAck(EmuTime::param time, int wait)
{
        // activate ACK for 'wait' milliseconds
        syncAck.removeSyncPoint();
        syncAck.setSyncPoint(time + EmuDuration::msec(wait));
        ack = true;
}
 
void LaserdiscPlayer::remoteButtonNEC(unsigned code, EmuTime::param time)
{
#ifdef DEBUG
        string f;
        switch (code) {
        case 0x47: f = "C+"; break;     // Increase playing speed
        case 0x46: f = "C-"; break;     // Decrease playing speed
        case 0x43: f = "D+"; break;     // Show Frame# & Chapter# OSD
        case 0x4b: f = "L+"; break;     // right
        case 0x49: f = "L-"; break;     // left
        case 0x4a: f = "L@"; break;     // stereo
        case 0x58: f = "M+"; break;     // multi speed forwards
        case 0x55: f = "M-"; break;     // multi speed backwards
        case 0x17: f = "P+"; break;     // play
        case 0x16: f = "P@"; break;     // stop
        case 0x18: f = "P/"; break;     // pause
        case 0x54: f = "S+"; break;     // frame step forward
        case 0x50: f = "S-"; break;     // frame step backwards
        case 0x45: f = "X+"; break;     // clear
        case 0x41: f = 'F'; break;      // seek frame
        case 0x40: f = 'C'; break;      // seek chapter
        case 0x42: f = "END"; break;    // done seek frame/chapter
        case 0x00: f = '0'; break;
        case 0x01: f = '1'; break;
        case 0x02: f = '2'; break;
        case 0x03: f = '3'; break;
        case 0x04: f = '4'; break;
        case 0x05: f = '5'; break;
        case 0x06: f = '6'; break;
        case 0x07: f = '7'; break;
        case 0x08: f = '8'; break;
        case 0x09: f = '9'; break;
        case 0x5f: f = "WAIT FRAME"; break;
 
        case 0x53: // previous chapter
        case 0x52: // next chapter
        default: break;
        }
 
        if (!f.empty()) {
                std::cerr << "LaserdiscPlayer::remote " << f << '\n';
        } else {
                std::cerr << "LaserdiscPlayer::remote unknown " << std::hex << code << '\n';
        }
#endif
        // When not playing the following buttons work
        // 0x17: start playing (ack sent)
        // 0x16: eject (no ack)
        // 0x49, 0x4a, 0x4b (ack sent)
        // if 0x49 is a repeat then no ACK is sent
        // if 0x49 is followed by 0x4a then ACK is sent
        if (code == one_of(0x49u, 0x4au, 0x4bu)) {
                updateStream(time);
 
                switch (code) {
                case 0x4b: // L+ (both channels play the left channel)
                        stereoMode = LEFT;
                        break;
                case 0x49: // L- (both channels play the right channel)
                        stereoMode = RIGHT;
                        break;
                case 0x4a: // L@ (normal stereo)
                        stereoMode = STEREO;
                        break;
                }
 
                setAck(time, 46);
        } else if (playerState == PLAYER_STOPPED) {
                switch (code) {
                case 0x16: // P@
                        motherBoard.getMSXCliComm().printWarning(
                                "ejecting laserdisc");
                        eject(time);
                        break;
                case 0x17: // P+
                        play(time);
                        break;
                }
 
                // During playing, playing will be acked if not repeated
                // within less than 115ms
        } else {
                // FIXME: while seeking, only a small subset of buttons work
                bool nonseekack = true;
 
                switch (code) {
                case 0x5f:
                        seekState = SEEK_WAIT;
                        seekNum = 0;
                        stillOnWaitFrame = false;
                        nonseekack = false;
                        break;
                case 0x41:
                        seekState = SEEK_FRAME;
                        seekNum = 0;
                        break;
                case 0x40:
                        seekState = SEEK_CHAPTER;
                        seekNum = 0;
                        nonseekack = video->getChapter(0) != 0;
                        break;
                case 0x00:
                case 0x01:
                case 0x02:
                case 0x03:
                case 0x04:
                case 0x05:
                case 0x06:
                case 0x07:
                case 0x08:
                case 0x09:
                        seekNum = seekNum * 10 + code;
                        break;
                case 0x42:
                        switch (seekState) {
                        case SEEK_FRAME:
                                seekState = SEEK_NONE;
                                seekFrame(seekNum % 100000, time);
                                nonseekack = false;
                                break;
                        case SEEK_CHAPTER:
                                seekState = SEEK_NONE;
                                seekChapter(seekNum % 100, time);
                                nonseekack = false;
                                break;
                        case SEEK_WAIT:
                                seekState = SEEK_NONE;
                                waitFrame = seekNum % 100000;
                                if (waitFrame >= 101 && waitFrame < 200) {
                                        auto frame = video->getChapter(
                                                int(waitFrame - 100));
                                        if (frame) waitFrame = frame;
                                }
                                break;
                        default:
                                seekState = SEEK_NONE;
                                break;
                        }
                        break;
                case 0x45: // Clear "X+"
                        if (seekState != SEEK_NONE && seekNum != 0) {
                                seekNum = 0;
                        } else {
                                seekState = SEEK_NONE;
                                seekNum = 0;
                        }
                        waitFrame = 0;
                        break;
                case 0x18: // P/
                        pause(time);
                        nonseekack = false;
                        break;
                case 0x17: // P+
                        play(time);
                        nonseekack = false;
                        break;
                case 0x16: // P@ (stop/eject)
                        stop(time);
                        nonseekack = false;
                        break;
                case 0xff:
                        nonseekack = false;
                        seekState = SEEK_NONE;
                        break;
                case 0x54: // S+ (frame step forward)
                        if (seekState == SEEK_WAIT) {
                                stillOnWaitFrame = true;
                        } else {
                                stepFrame(true);
                        }
                        break;
                case 0x50: // S- (frame step backwards)
                        stepFrame(false);
                        break;
                case 0x55: // M- (multispeed backwards)
                        // Not supported
                        motherBoard.getMSXCliComm().printWarning(
                                "The Laserdisc player received a command to "
                                "play backwards (M-). This is currently not "
                                "supported.");
                        nonseekack = false;
                        break;
                case 0x58: // M+ (multispeed forwards)
                        playerState = PLAYER_MULTISPEED;
                        setFrameStep();
                        break;
                case 0x46: // C- (play slower)
                        if (playingSpeed >= SPEED_STEP1) {
                                playingSpeed--;
                                frameStep = 1;  // FIXME: is this correct?
                        }
                        break;
                case 0x47: // C+ (play faster)
                        if (playingSpeed <= SPEED_X2) {
                                playingSpeed++;
                                frameStep = 1;  // FIXME: is this correct?
                        }
                        break;
                default:
                        motherBoard.getMSXCliComm().printWarning(
                                "The Laserdisc player received an unknown "
                                "command 0x", hex_string<2>(code));
                        nonseekack = false;
                        break;
                }
 
                if (nonseekack) {
                        // All ACKs for operations which do not
                        // require seeking
                        setAck(time, 46);
                }
        }
}
 
void LaserdiscPlayer::execSyncAck(EmuTime::param time)
{
        updateStream(time);
 
        if (seeking && playerState == PLAYER_PLAYING) {
                sampleClock.advance(time);
        }
 
        ack = false;
        seeking = false;
}
 
void LaserdiscPlayer::execSyncFrame(EmuTime::param time, bool odd)
{
        updateStream(time);
 
        if (!odd || (video && video->getFrameRate() == 60)) {
                if ((playerState != PLAYER_STOPPED) &&
                    (currentFrame > video->getFrames())) {
                        playerState = PLAYER_STOPPED;
                }
 
                if (auto* rawFrame = renderer->getRawFrame()) {
                        renderer->frameStart(time);
 
                        if (isVideoOutputAvailable(time)) {
                                auto frame = currentFrame;
                                if (video->getFrameRate() == 60) {
                                        frame *= 2;
                                        if (odd) frame--;
                                }
 
                                video->getFrameNo(*rawFrame, frame);
 
                                if (!odd) {
                                        nextFrame(time);
                                }
                        } else {
                                renderer->drawBlank(0, 128, 196);
                        }
                        renderer->frameEnd();
                }
 
                // Update throttling
                loadingIndicator.update(seeking || sampleReads > 500);
                sampleReads = 0;
 
                if (!odd) {
                        scheduleDisplayStart(time);
                }
        }
 
        // Processing of the remote control happens at each frame
        // (even and odd, so at 59.94Hz)
        if (remoteProtocol == IR_NEC) {
                if (remoteExecuteDelayed) {
                        remoteButtonNEC(remoteCode, time);
                }
 
                if (++remoteVblanksBack > 6) {
                        remoteProtocol = IR_NONE;
                }
        }
        remoteExecuteDelayed = false;
}
 
void LaserdiscPlayer::setFrameStep()
{
        switch (playingSpeed) {
        case SPEED_X3:
        case SPEED_X2:
        case SPEED_X1:
                frameStep = 1;
                break;
        case SPEED_1IN2:
                frameStep = 2;
                break;
        case SPEED_1IN4:
                frameStep = 4;
                break;
        case SPEED_1IN8:
                frameStep = 8;
                break;
        case SPEED_1IN16:
                frameStep = 16;
                break;
        case SPEED_STEP1:
                frameStep = 30;
                break;
        case SPEED_STEP3:
                frameStep = 90;
                break;
        }
}
 
void LaserdiscPlayer::nextFrame(EmuTime::param time)
{
        if (waitFrame && waitFrame == currentFrame) {
                // Leave ACK raised until the next command
                ack = true;
                waitFrame = 0;
 
                if (stillOnWaitFrame) {
                        playingFromSample = getCurrentSample(time);
                        playerState = PLAYER_STILL;
                        stillOnWaitFrame = false;
                }
        }
 
        if (playerState == PLAYER_MULTISPEED) {
                if (--frameStep)  {
                        return;
                }
 
                switch (playingSpeed) {
                case SPEED_X3:
                        currentFrame += 3;
                        break;
                case SPEED_X2:
                        currentFrame += 2;
                        break;
                default:
                        currentFrame += 1;
                        break;
                }
                setFrameStep();
        } else if (playerState == PLAYER_PLAYING) {
                currentFrame++;
        }
 
        // freeze if stop frame
        if ((playerState == one_of(PLAYER_PLAYING, PLAYER_MULTISPEED))
             && video->stopFrame(currentFrame)) {
                // stop frame reached
                playingFromSample = getCurrentSample(time);
                playerState = PLAYER_STILL;
        }
}
 
void LaserdiscPlayer::setImageName(string newImage, EmuTime::param time)
{
        stop(time);
        oggImage = Filename(std::move(newImage), userFileContext());
        video.emplace(oggImage, motherBoard.getMSXCliComm());
 
        unsigned inputRate = video->getSampleRate();
        sampleClock.setFreq(inputRate);
        if (inputRate != getInputRate()) {
                setInputRate(inputRate);
                createResampler();
        }
}
 
int LaserdiscPlayer::signalEvent(const Event& event) noexcept
{
        if (getType(event) == EventType::BOOT && video) {
                autoRun();
        }
        return 0;
}
 
void LaserdiscPlayer::autoRun()
{
        if (!autoRunSetting.getBoolean()) return;
        if (motherBoard.getReverseManager().isReplaying()) {
                // See comments in CassettePlayer::autoRun()
                return;
        }
 
        string var = "::auto_run_ld_counter";
        string command = strCat(
                "if ![info exists ", var, "] { set ", var, " 0 }\n"
                "incr ", var, "\n"
                "after time 2 \"if $", var, "==\\$", var, " { "
                "type_via_keyboard 1CALLLD\\\\r }\"");
        try {
                motherBoard.getCommandController().executeCommand(command);
        } catch (CommandException& e) {
                motherBoard.getMSXCliComm().printWarning(
                        "Error executing loading instruction for AutoRun: ",
                        e.getMessage(), "\n Please report a bug.");
        }
}
 
void LaserdiscPlayer::generateChannels(float** buffers, unsigned num)
{
        // Single channel device: replace content of buffers[0] (not add to it).
        if (playerState != PLAYER_PLAYING || seeking || (muteLeft && muteRight)) {
                buffers[0] = nullptr;
                return;
        }
 
        unsigned pos = 0;
        size_t currentSample;
 
        if (!sampleClock.before(start)) [[unlikely]] {
                // Before playing of sounds begins
                EmuDuration duration = sampleClock.getTime() - start;
                unsigned len = duration.getTicksAt(video->getSampleRate());
                if (len >= num) {
                        buffers[0] = nullptr;
                        return;
                }
 
                for (; pos < len; ++pos) {
                        buffers[0][pos * 2 + 0] = 0.0f;
                        buffers[0][pos * 2 + 1] = 0.0f;
                }
 
                currentSample = playingFromSample;
        } else {
                currentSample = getCurrentSample(start);
        }
 
        unsigned drift = video->getSampleRate() / 30;
 
        if (currentSample > (lastPlayedSample + drift) ||
            (currentSample + drift) < lastPlayedSample) {
                // audio drift
                lastPlayedSample = currentSample;
        }
 
        int left = stereoMode == RIGHT ? 1 : 0;
        int right = stereoMode == LEFT ? 0 : 1;
 
        while (pos < num) {
                const AudioFragment* audio = video->getAudio(lastPlayedSample);
 
                if (!audio) {
                        if (pos == 0) {
                                buffers[0] = nullptr;
                                break;
                        } else {
                                for (; pos < num; ++pos) {
                                        buffers[0][pos * 2 + 0] = 0.0f;
                                        buffers[0][pos * 2 + 1] = 0.0f;
                                }
                        }
                } else {
                        auto offset = unsigned(lastPlayedSample - audio->position);
                        unsigned len = std::min(audio->length - offset, num - pos);
 
                        // maybe muting should be moved out of the loop?
                        for (unsigned i = 0; i < len; ++i, ++pos) {
                                buffers[0][pos * 2 + 0] = muteLeft ? 0.0f :
                                   audio->pcm[left][offset + i];
                                buffers[0][pos * 2 + 1] = muteRight ? 0.0f :
                                   audio->pcm[right][offset + i];
                        }
 
                        lastPlayedSample += len;
                }
        }
}
 
float LaserdiscPlayer::getAmplificationFactorImpl() const
{
        return 2.0f;
}
 
bool LaserdiscPlayer::updateBuffer(unsigned length, float* buffer,
                                   EmuTime::param time)
{
        bool result = ResampledSoundDevice::updateBuffer(length, buffer, time);
        start = time; // current end-time is next start-time
        return result;
}
 
void LaserdiscPlayer::setMuting(bool left, bool right, EmuTime::param time)
{
        updateStream(time);
        muteLeft = left;
        muteRight = right;
}
 
void LaserdiscPlayer::play(EmuTime::param time)
{
        if (video) {
                updateStream(time);
 
                if (seeking) {
                        // Do not ACK, play while seeking
                } else if (playerState == PLAYER_STOPPED) {
                        // Disk needs to spin up, which takes 9.6s on
                        // my Pioneer LD-92000. Also always seek to
                        // beginning (confirmed on real MSX and LD)
                        video->seek(1, 0);
                        lastPlayedSample = 0;
                        playingFromSample = 0;
                        currentFrame = 1;
                        // Note that with "fullspeedwhenloading" this
                        // should be reduced to.
                        setAck(time, 9600);
                        seekState = SEEK_NONE;
                        seeking = true;
                        waitFrame = 0;
                        stereoMode = STEREO;
                        playingSpeed = SPEED_1IN4;
                } else if (playerState == PLAYER_PLAYING) {
                        // If Play command is issued while the player
                        // is already playing, then if no ACK is sent then
                        // Astron Belt will send LD1100 commands
                        setAck(time, 46);
                } else if (playerState == PLAYER_MULTISPEED) {
                        // Should be hearing stuff again
                        playingFromSample = (currentFrame - 1ll) * 1001ll *
                                        video->getSampleRate() / 30000ll;
                        sampleClock.advance(time);
                        setAck(time, 46);
                } else {
                        // STILL or PAUSED
                        sampleClock.advance(time);
                        setAck(time, 46);
                }
                playerState = PLAYER_PLAYING;
        }
}
 
size_t LaserdiscPlayer::getCurrentSample(EmuTime::param time)
{
        switch(playerState) {
        case PLAYER_PAUSED:
        case PLAYER_STILL:
                return playingFromSample;
        default:
                return playingFromSample + sampleClock.getTicksTill(time);
        }
}
 
void LaserdiscPlayer::pause(EmuTime::param time)
{
        if (playerState != PLAYER_STOPPED) {
                updateStream(time);
 
                if (playerState == PLAYER_PLAYING) {
                        playingFromSample = getCurrentSample(time);
                } else if (playerState == PLAYER_MULTISPEED) {
                        playingFromSample = (currentFrame - 1ll) * 1001ll *
                                        video->getSampleRate() / 30000ll;
                        sampleClock.advance(time);
                }
 
                playerState = PLAYER_PAUSED;
                setAck(time, 46);
        }
}
 
void LaserdiscPlayer::stop(EmuTime::param time)
{
        if (playerState != PLAYER_STOPPED) {
                updateStream(time);
                playerState = PLAYER_STOPPED;
        }
}
 
void LaserdiscPlayer::eject(EmuTime::param time)
{
        stop(time);
        oggImage = {};
        video.reset();
}
 
// Step one frame forwards or backwards. The frame will be visible and
// we won't be playing afterwards
void LaserdiscPlayer::stepFrame(bool forwards)
{
        bool needseek = false;
 
        // Note that on real hardware, the screen goes dark momentarily
        // if you try to step before the first frame or after the last one
        if (playerState == PLAYER_STILL) {
                if (forwards) {
                        if (currentFrame < video->getFrames()) {
                                currentFrame++;
                        }
                } else {
                        if (currentFrame > 1) {
                                currentFrame--;
                                needseek = true;
                        }
                }
        }
 
        playerState = PLAYER_STILL;
        int64_t samplePos = (currentFrame - 1ll) * 1001ll *
                            video->getSampleRate() / 30000ll;
        playingFromSample = samplePos;
 
        if (needseek) {
                if (video->getFrameRate() == 60)
                        video->seek(currentFrame * 2, samplePos);
                else
                        video->seek(currentFrame, samplePos);
        }
}
 
void LaserdiscPlayer::seekFrame(size_t toFrame, EmuTime::param time)
{
        if ((playerState != PLAYER_STOPPED) && video) {
                updateStream(time);
 
                if (toFrame <= 0) toFrame = 1;
                if (toFrame > video->getFrames()) toFrame = video->getFrames();
 
                // Seek time needs to be emulated correctly since
                // e.g. Astron Belt does not wait for the seek
                // to complete, it simply assumes a certain
                // delay.
                //
                // This calculation is based on measurements on
                // a Pioneer LD-92000.
                auto dist = std::abs(int64_t(toFrame) - int64_t(currentFrame));
                int seektime = (dist < 1000) // time in ms
                             ? (dist + 300)
                             : (1800 + dist / 12);
 
                int64_t samplePos = (toFrame - 1ll) * 1001ll *
                                    video->getSampleRate() / 30000ll;
 
                if (video->getFrameRate() == 60) {
                        video->seek(toFrame * 2, samplePos);
                } else {
                        video->seek(toFrame, samplePos);
                }
                playerState = PLAYER_STILL;
                playingFromSample = samplePos;
                currentFrame = toFrame;
 
                // Seeking clears the frame to wait for
                waitFrame = 0;
 
                seeking = true;
                setAck(time, seektime);
        }
}
 
void LaserdiscPlayer::seekChapter(int chapter, EmuTime::param time)
{
        if ((playerState != PLAYER_STOPPED) && video) {
                auto frameNo = video->getChapter(chapter);
                if (!frameNo) return;
                seekFrame(frameNo, time);
        }
}
 
int16_t LaserdiscPlayer::readSample(EmuTime::param time)
{
        // Here we should return the value of the sample on the
        // right audio channel, ignoring muting (this is done in the MSX)
        // but honouring the stereo mode as this is done in the
        // Laserdisc player
        if (playerState == PLAYER_PLAYING && !seeking) {
                auto sample = getCurrentSample(time);
                if (const AudioFragment* audio = video->getAudio(sample)) {
                        ++sampleReads;
                        int channel = stereoMode == LEFT ? 0 : 1;
                        return int(audio->pcm[channel][sample - audio->position]
                                                         * 32767.f);
                }
        }
        return 0;
}
 
bool LaserdiscPlayer::isVideoOutputAvailable(EmuTime::param time)
{
        updateStream(time);
 
        bool videoOut = [&] {
                switch (playerState) {
                case PLAYER_PLAYING:
                case PLAYER_MULTISPEED:
                case PLAYER_STILL:
                        return !seeking;
                default:
                        return false;
                }
        }();
        ldControl.videoIn(videoOut);
 
        return videoOut;
}
 
void LaserdiscPlayer::preVideoSystemChange() noexcept
{
        renderer.reset();
}
 
void LaserdiscPlayer::postVideoSystemChange() noexcept
{
        createRenderer();
}
 
void LaserdiscPlayer::createRenderer()
{
        Display& display = getMotherBoard().getReactor().getDisplay();
        renderer = RendererFactory::createLDRenderer(*this, display);
}
 
static constexpr std::initializer_list<enum_string<LaserdiscPlayer::RemoteState>> RemoteStateInfo = {
        { "IDLE",               LaserdiscPlayer::REMOTE_IDLE            },
        { "HEADER_PULSE",       LaserdiscPlayer::REMOTE_HEADER_PULSE    },
        { "NEC_HEADER_SPACE",   LaserdiscPlayer::NEC_HEADER_SPACE       },
        { "NEC_BITS_PULSE",     LaserdiscPlayer::NEC_BITS_PULSE         },
        { "NEC_BITS_SPACE",     LaserdiscPlayer::NEC_BITS_SPACE         },
};
SERIALIZE_ENUM(LaserdiscPlayer::RemoteState, RemoteStateInfo);
 
static constexpr std::initializer_list<enum_string<LaserdiscPlayer::PlayerState>> PlayerStateInfo = {
        { "STOPPED",            LaserdiscPlayer::PLAYER_STOPPED         },
        { "PLAYING",            LaserdiscPlayer::PLAYER_PLAYING         },
        { "MULTISPEED",         LaserdiscPlayer::PLAYER_MULTISPEED      },
        { "PAUSED",             LaserdiscPlayer::PLAYER_PAUSED          },
        { "STILL",              LaserdiscPlayer::PLAYER_STILL           }
};
SERIALIZE_ENUM(LaserdiscPlayer::PlayerState, PlayerStateInfo);
 
static constexpr std::initializer_list<enum_string<LaserdiscPlayer::SeekState>> SeekStateInfo = {
        { "NONE",               LaserdiscPlayer::SEEK_NONE              },
        { "CHAPTER",            LaserdiscPlayer::SEEK_CHAPTER           },
        { "FRAME",              LaserdiscPlayer::SEEK_FRAME             },
        { "WAIT",               LaserdiscPlayer::SEEK_WAIT              }
};
SERIALIZE_ENUM(LaserdiscPlayer::SeekState, SeekStateInfo);
 
static constexpr std::initializer_list<enum_string<LaserdiscPlayer::StereoMode>> StereoModeInfo = {
        { "LEFT",               LaserdiscPlayer::LEFT                   },
        { "RIGHT",              LaserdiscPlayer::RIGHT                  },
        { "STEREO",             LaserdiscPlayer::STEREO                 }
};
SERIALIZE_ENUM(LaserdiscPlayer::StereoMode, StereoModeInfo);
 
static constexpr std::initializer_list<enum_string<LaserdiscPlayer::RemoteProtocol>> RemoteProtocolInfo = {
        { "NONE",               LaserdiscPlayer::IR_NONE                },
        { "NEC",                LaserdiscPlayer::IR_NEC                 },
};
SERIALIZE_ENUM(LaserdiscPlayer::RemoteProtocol, RemoteProtocolInfo);
 
// version 1: initial version
// version 2: added 'stillOnWaitFrame'
// version 3: reversed bit order of 'remoteBits' and 'remoteCode'
// version 4: removed 'userData' from Schedulable
template<typename Archive>
void LaserdiscPlayer::serialize(Archive& ar, unsigned version)
{
        // Serialize remote control
        ar.serialize("RemoteState", remoteState);
        if (remoteState != REMOTE_IDLE) {
                ar.serialize("RemoteBitNr", remoteBitNr,
                             "RemoteBits",  remoteBits);
                if (ar.versionBelow(version, 3)) {
                        assert(Archive::IS_LOADER);
                        remoteBits = Math::reverseNBits(remoteBits, remoteBitNr);
                }
        }
        ar.serialize("RemoteLastBit",  remoteLastBit,
                     "RemoteLastEdge", remoteLastEdge,
                     "RemoteProtocol", remoteProtocol);
        if (remoteProtocol != IR_NONE) {
                ar.serialize("RemoteCode", remoteCode);
                if (ar.versionBelow(version, 3)) {
                        assert(Archive::IS_LOADER);
                        remoteCode = Math::reverseByte(remoteCode);
                }
                ar.serialize("RemoteExecuteDelayed", remoteExecuteDelayed,
                             "RemoteVblanksBack",    remoteVblanksBack);
        }
 
        // Serialize filename
        ar.serialize("OggImage", oggImage);
        if constexpr (Archive::IS_LOADER) {
                sampleReads = 0;
                if (!oggImage.empty()) {
                        setImageName(oggImage.getResolved(), getCurrentTime());
                } else {
                        video.reset();
                }
        }
        ar.serialize("PlayerState", playerState);
 
        if (playerState != PLAYER_STOPPED) {
                // Serialize seek state
                ar.serialize("SeekState", seekState);
                if (seekState != SEEK_NONE) {
                        ar.serialize("SeekNum", seekNum);
                }
                ar.serialize("seeking", seeking);
 
                // Playing state
                ar.serialize("WaitFrame", waitFrame);
 
                // This was not yet implemented in openmsx 0.8.1 and earlier
                if (ar.versionAtLeast(version, 2)) {
                        ar.serialize("StillOnWaitFrame", stillOnWaitFrame);
                }
 
                ar.serialize("ACK",          ack,
                             "PlayingSpeed", playingSpeed);
 
                // Frame position
                ar.serialize("CurrentFrame", currentFrame);
                if (playerState == PLAYER_MULTISPEED) {
                        ar.serialize("FrameStep", frameStep);
                }
 
                // Audio position
                ar.serialize("StereoMode",  stereoMode,
                             "FromSample",  playingFromSample,
                             "SampleClock", sampleClock);
 
                if constexpr (Archive::IS_LOADER) {
                        // If the samplerate differs, adjust accordingly
                        if (video->getSampleRate() != sampleClock.getFreq()) {
                                uint64_t pos = playingFromSample;
 
                                pos *= video->getSampleRate();
                                pos /= sampleClock.getFreq();
 
                                playingFromSample = pos;
                                sampleClock.setFreq(video->getSampleRate());
                        }
 
                        auto sample = getCurrentSample(getCurrentTime());
                        if (video->getFrameRate() == 60)
                                video->seek(currentFrame * 2, sample);
                        else
                                video->seek(currentFrame, sample);
                        lastPlayedSample = sample;
                }
        }
 
        if (ar.versionAtLeast(version, 4)) {
                ar.serialize("syncEven", syncEven,
                             "syncOdd",  syncOdd,
                             "syncAck",  syncAck);
        } else {
                Schedulable::restoreOld(ar, {&syncEven, &syncOdd, &syncAck});
        }
 
        if constexpr (Archive::IS_LOADER) {
                (void)isVideoOutputAvailable(getCurrentTime());
        }
}
 
INSTANTIATE_SERIALIZE_METHODS(LaserdiscPlayer);
 
} // namespace openmsx