CWE-ou-minkata/Sources/Plasma/FeatureLib/pfMoviePlayer/plMoviePlayer.cpp

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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*==LICENSE==*/

#include "plMoviePlayer.h"
#include <tuple>

#ifdef VPX_AVAILABLE
#   define VPX_CODEC_DISABLE_COMPAT 1
#   include <vpx/vpx_decoder.h>
#   include <vpx/vp8dx.h>
#   define iface (vpx_codec_vp8_dx())
#endif

#include "plGImage/plMipmap.h"
#include "pnKeyedObject/plUoid.h"
#include "plPipeline/hsGDeviceRef.h"
#include "plPipeline/plPlates.h"
#include "plPlanarImage.h"
#include "hsResMgr.h"
#include "hsTimer.h"

#include "webm/mkvreader.hpp"
#include "webm/mkvparser.hpp"

#define SAFE_OP(x, err) \
    { \
        int64_t ret = 0; \
        ret = x; \
        if (ret == -1) \
        { \
            hsAssert(false, "failed to " err); \
            return false; \
        } \
    }

// =====================================================

class VPX
{
    VPX() { }

public:
    vpx_codec_ctx_t codec;

    ~VPX() {
        if (vpx_codec_destroy(&codec))
            hsAssert(false, vpx_codec_error_detail(&codec));
    }

    static VPX* Create()
    {
        VPX* instance = new VPX;
        if(vpx_codec_dec_init(&instance->codec, iface, nullptr, 0))
        {
            hsAssert(false, vpx_codec_error_detail(&instance->codec));
            return nullptr;
        }
        return instance;
    }

    vpx_image_t* Decode(uint8_t* buf, uint32_t size)
    {
        if (vpx_codec_decode(&codec, buf, size, nullptr, 0) != VPX_CODEC_OK)
        {
            const char* detail = vpx_codec_error_detail(&codec);
            hsAssert(false, detail ? detail : "unspecified decode error");
            return nullptr;
        }

        vpx_codec_iter_t  iter = nullptr;
        // ASSUMPTION: only one image per frame
        // if this proves false, move decoder function into IProcessVideoFrame
        return vpx_codec_get_frame(&codec, &iter);
    }
};

// =====================================================

class TrackMgr
{
    const mkvparser::BlockEntry* blk_entry;
    bool valid;

    bool PeekNextBlockEntry(const std::unique_ptr<mkvparser::Segment>& segment)
    {
        // Assume that if blk_entry == nullptr, we need to start from the beginning
        const mkvparser::Cluster* cluster;
        if (blk_entry)
            cluster = blk_entry->GetCluster();
        else
            cluster = segment->GetFirst();

        while (true)
        {
            if (cluster->EOS())
            {
                cluster = segment->GetNext(cluster);
                blk_entry = nullptr;
                if (!cluster)
                    return false;
            }
            if (blk_entry)
            {
                SAFE_OP(cluster->GetNext(blk_entry, blk_entry), "get next block");
            }
            else
            {
                SAFE_OP(cluster->GetFirst(blk_entry), "get first block");
            }

            if (blk_entry)
            {
                if (blk_entry->EOS())
                    continue;
                if (blk_entry->GetBlock()->GetTrackNumber() == number)
                    return true;
            }
        }
        return false; // if this happens, boom.
    }

public:
    uint32_t number;

    TrackMgr(uint32_t num) : blk_entry(nullptr), valid(true), number(num) { }

    bool GetFrames(plMoviePlayer* p, int64_t movieTime, std::vector<blkbuf_t>& frames)
    {
        if (!valid)
            return false;

        const mkvparser::BlockEntry* prev = blk_entry;
        while ((valid = PeekNextBlockEntry(p->fSegment)))
        {
            const mkvparser::Block* blk = blk_entry->GetBlock();
            if (blk->GetTime(blk_entry->GetCluster()) <= movieTime)
            {
                frames.reserve(frames.size() + blk->GetFrameCount());
                for (int32_t i = 0; i < blk->GetFrameCount(); ++i)
                {
                    const mkvparser::Block::Frame data = blk->GetFrame(i);
                    uint8_t* buf = new uint8_t[data.len];
                    data.Read(p->fReader, buf);
                    frames.push_back(std::make_tuple(std::unique_ptr<uint8_t>(buf), static_cast<int32_t>(data.len)));
                }
            } else
            {
                blk_entry = prev;
                return true;
            }
            prev = blk_entry;
        }
        return true;
    }

#if 0
    bool Advance(plMoviePlayer* p, int64_t movieTime=0)
    {
        if (!valid)
            return false;

        // This keeps us from getting behind due to freezes
        // Assumption: Audio will not skip ahead in time. FIXME?
        while ((valid = PeekNextBlockEntry(p->fSegment)))
        {
            const mkvparser::Block* blk = blk_entry->GetBlock();
            if (blk->GetTime(blk_entry->GetCluster()) < movieTime)
                continue;
            else
                return true;
        }
        return false; // ran out of blocks
    }

    int32_t GetBlockData(plMoviePlayer* p, std::vector<blkbuf_t>& frames) const
    {
        const mkvparser::Block* block = blk_entry->GetBlock();

        // Return the frames
        frames.reserve(block->GetFrameCount());
        for (int32_t i = 0; i < block->GetFrameCount(); ++i)
        {
            const mkvparser::Block::Frame frame = block->GetFrame(i);
            std::shared_ptr<uint8_t> data(new uint8_t[frame.len]);
            frame.Read(p->fReader, data.get());
            frames.push_back(std::make_tuple(data, frame.len));
        }
        return block->GetFrameCount();
    }
#endif 0
};

// =====================================================

plMoviePlayer::plMoviePlayer() :
    fPlate(nullptr),
    fTexture(nullptr),
    fReader(nullptr),
    fTimeScale(0), 
    fStartTime(0)
{
    fScale.Set(1.0f, 1.0f);
}

plMoviePlayer::~plMoviePlayer()
{
    if (fPlate)
        // The plPlate owns the Mipmap Texture, so it destroys it for us
        plPlateManager::Instance().DestroyPlate(fPlate);
#ifdef VPX_AVAILABLE
    if (fReader)
        fReader->Close();
#endif
}

int64_t plMoviePlayer::GetMovieTime() const
{
    return ((int64_t) hsTimer::GetSeconds() * fTimeScale) - fStartTime;
}

bool plMoviePlayer::IOpenMovie()
{
#ifdef VPX_AVAILABLE
    if (!plFileInfo(fMoviePath).Exists())
    {
        hsAssert(false, "Tried to play a movie that doesn't exist");
        return false;
    }

    // open the movie with libwebm
    fReader = new mkvparser::MkvReader;
    SAFE_OP(fReader->Open(fMoviePath.AsString().c_str()), "open movie");

    // opens the segment
    // it contains everything you ever want to know about the movie
    long long pos = 0;
    mkvparser::EBMLHeader ebmlHeader;
    ebmlHeader.Parse(fReader, pos);
    mkvparser::Segment* seg;
    SAFE_OP(mkvparser::Segment::CreateInstance(fReader, pos, seg), "get segment info");
    SAFE_OP(seg->Load(), "load segment from webm");
    fSegment.reset(seg);

    // Just in case someone gives us a weird file, find out the timecode offset
    fTimeScale = fSegment->GetInfo()->GetTimeCodeScale();

    // TODO: Figure out video and audio based on current language
    //       For now... just take the first one.
    const mkvparser::Tracks* tracks = fSegment->GetTracks();
    for (uint32_t i = 0; i < tracks->GetTracksCount(); ++i)
    {
        const mkvparser::Track* track = tracks->GetTrackByIndex(i);
        if (!track)
            continue;

        switch (track->GetType())
        {
        case mkvparser::Track::kAudio:
            {
                if (!fAudioTrack)
                    fAudioTrack.reset(new TrackMgr(track->GetNumber()));
                break;
            }
        case mkvparser::Track::kVideo:
            {
                if (!fVideoTrack)
                    fVideoTrack.reset(new TrackMgr(track->GetNumber()));
                break;
            }
        }
    }
    return true;
#else
    return false;
#endif
}

bool plMoviePlayer::IProcessVideoFrame(const std::vector<blkbuf_t>& frames)
{
    vpx_image_t* img = nullptr;

    // We have to decode all the frames, but we only want to display the most recent one to the user.
    for (auto it = frames.begin(); it != frames.end(); ++it)
    {
        const std::unique_ptr<uint8_t>& buf = std::get<0>(*it);
        int32_t size = std::get<1>(*it);
        img = fVpx->Decode(buf.get(), static_cast<uint32_t>(size));
    }

    if (img)
    {
        // According to VideoLAN[1], I420 is the most common image format in videos. I am inclined to believe this as our
        // attemps to convert the common Uru videos use I420 image data. So, as a shortcut, we will only implement that format.
        // If for some reason we need other formats, please, be my guest!
        // [1] = http://wiki.videolan.org/YUV#YUV_4:2:0_.28I420.2FJ420.2FYV12.29
        switch (img->fmt)
        {
        case VPX_IMG_FMT_I420:
            plPlanarImage::Yuv420ToRgba(img->d_w, img->d_h, img->stride, img->planes, reinterpret_cast<uint8_t*>(fTexture->GetImage()));
            break;

        DEFAULT_FATAL("image format");
        }

        // Flush new data to the device
        if (fTexture->GetDeviceRef())
            fTexture->GetDeviceRef()->SetDirty(true);
        return true;
    }
    return false;
}

bool plMoviePlayer::Start()
{
#ifdef VPX_AVAILABLE
    if (!IOpenMovie())
        return false;
    hsAssert(fVideoTrack, "nil video track -- expect bad things to happen!");

    // Initialize VP8
    if (VPX* vpx = VPX::Create())
        fVpx.reset(vpx);
    else
        return false;

    // Need to figure out scaling based on pipe size.
    plPlateManager& plateMgr = plPlateManager::Instance();
    const mkvparser::VideoTrack* video = static_cast<const mkvparser::VideoTrack*>(fSegment->GetTracks()->GetTrackByNumber(fVideoTrack->number));
    float width = (static_cast<float>(video->GetWidth()) / static_cast<float>(plateMgr.GetPipeWidth())) * fScale.fX;
    float height = (static_cast<float>(video->GetHeight()) / static_cast<float>(plateMgr.GetPipeHeight())) * fScale.fY;

    plateMgr.CreatePlate(&fPlate, fPosition.fX, fPosition.fY, width, height);
    fPlate->SetVisible(true);
    fTexture = fPlate->CreateMaterial(static_cast<uint32_t>(video->GetWidth()), static_cast<uint32_t>(video->GetHeight()), nullptr);
    return true;
#else
    return false;
#endif // VPX_AVAILABLE
}

bool plMoviePlayer::NextFrame()
{
#ifdef VPX_AVAILABLE
    // Get our current timecode
    int64_t movieTime = 0;
    if (fStartTime == 0)
        fStartTime = static_cast<int64_t>((hsTimer::GetSeconds() * fTimeScale));
    else
        movieTime = GetMovieTime();

    std::vector<blkbuf_t> audio;
    std::vector<blkbuf_t> video;
    {
        uint8_t tracksWithData = 0;
        if (fAudioTrack)
        {
            if (fAudioTrack->GetFrames(this, movieTime, audio))
                tracksWithData++;
        }
        if (fVideoTrack)
        {
            if (fVideoTrack->GetFrames(this, movieTime, video))
                tracksWithData++;
        }
        if (tracksWithData == 0)
            return false;
    }

    // Show our mess
    IProcessVideoFrame(video);

    return true;
#else
    return false;
#endif // VPX_AVAILABLE
}

bool plMoviePlayer::Stop()
{
    for (int i = 0; i < fCallbacks.GetCount(); i++)
        fCallbacks[i]->Send();
    fCallbacks.Reset();
    return false;
}