C++ VideoOutput::GetLastShownFrame方法代码示例

void SubtitleScreen::DisplayRawTextSubtitles(void)
{
    if (!InitialiseFont(m_fontStretch) || !m_player || !m_subreader)
        return;

    uint64_t duration;
    QStringList subs = m_subreader->GetRawTextSubtitles(duration);
    if (subs.empty())
        return;

    VideoOutput *vo = m_player->GetVideoOutput();
    if (vo)
    {
        QRect oldsafe = m_safeArea;
        m_safeArea = m_player->GetVideoOutput()->GetSafeRect();
        if (oldsafe != m_safeArea)
        {
            int height = (m_safeArea.height() * m_textFontZoom) / 1800;
            gTextSubFont->GetFace()->setPixelSize(height);
            gTextSubFont->SetColor(Qt::white);
        }
    }
    else
        return;

    VideoFrame *currentFrame = vo->GetLastShownFrame();
    if (!currentFrame)
        return;

    // delete old subs that may still be on screen
    DeleteAllChildren();
    OptimiseTextSubs(subs);
    DrawTextSubtitles(subs, currentFrame->timecode, duration);
}

void SubtitleScreen::ExpireSubtitles(void)
{
    VideoOutput    *videoOut = m_player->GetVideoOutput();
    VideoFrame *currentFrame = videoOut ? videoOut->GetLastShownFrame() : NULL;
    long long now = currentFrame ? currentFrame->timecode : LLONG_MAX;
    QMutableHashIterator<MythUIType*, long long> it(m_expireTimes);
    while (it.hasNext())
    {
        it.next();
        if (it.value() < now)
        {
            DeleteChild(it.key());
            it.remove();
            SetRedraw();
        }
    }
}

    void Test(void)
    {
        PIPMap dummy;

        if (novideosync) // TODO
            LOG(VB_GENERAL, LOG_INFO, "Will attempt to disable sync-to-vblank.");

        RingBuffer *rb  = RingBuffer::Create(file, false, true, 2000);
        MythPlayer  *mp  = new MythPlayer(kAudioMuted);
        mp->GetAudio()->SetAudioInfo("NULL", "NULL", 0, 0);
        mp->GetAudio()->SetNoAudio();
        ctx = new PlayerContext("VideoPerformanceTest");
        ctx->SetRingBuffer(rb);
        ctx->SetPlayer(mp);
        ctx->SetPlayingInfo(new ProgramInfo(file));
        mp->SetPlayerInfo(NULL, GetMythMainWindow(), true, ctx);
        FrameScanType scan = deinterlace ? kScan_Interlaced : kScan_Progressive;
        if (!mp->StartPlaying())
        {
            LOG(VB_GENERAL, LOG_ERR, "Failed to start playback.");
            return;
        }

        VideoOutput *vo = mp->GetVideoOutput();
        if (!vo)
        {
            LOG(VB_GENERAL, LOG_ERR, "No video output.");
            return;
        }

        LOG(VB_GENERAL, LOG_INFO, "-----------------------------------");
        LOG(VB_GENERAL, LOG_INFO, QString("Starting video performance test for '%1'.")
            .arg(file));
        LOG(VB_GENERAL, LOG_INFO, QString("Test will run for %1 seconds.")
            .arg(secondstorun));

        if (decodeonly)
            LOG(VB_GENERAL, LOG_INFO, "Decoding frames only - skipping display.");
        LOG(VB_GENERAL, LOG_INFO, QString("Deinterlacing %1")
            .arg(deinterlace ? "enabled" : "disabled"));

        Jitterometer *jitter = new Jitterometer("Performance: ", mp->GetFrameRate());

        int ms = secondstorun * 1000;
        QTime start = QTime::currentTime();
        while (1)
        {
            int duration = start.msecsTo(QTime::currentTime());
            if (duration < 0 || duration > ms)
            {
                LOG(VB_GENERAL, LOG_INFO, "Complete.");
                break;
            }

            if (mp->IsErrored())
            {
                LOG(VB_GENERAL, LOG_ERR, "Playback error.");
                break;
            }

            if (mp->GetEof())
            {
                LOG(VB_GENERAL, LOG_INFO, "End of file.");
                break;
            }

            if (!mp->PrebufferEnoughFrames())
                continue;

            mp->SetBuffering(false);
            vo->StartDisplayingFrame();
            VideoFrame *frame = vo->GetLastShownFrame();
            mp->CheckAspectRatio(frame);

            if (!decodeonly)
            {
                vo->ProcessFrame(frame, NULL, NULL, dummy, scan);
                vo->PrepareFrame(frame, scan, NULL);
                vo->Show(scan);
            }
            vo->DoneDisplayingFrame(frame);
            jitter->RecordCycleTime();
        }
        LOG(VB_GENERAL, LOG_INFO, "-----------------------------------");
    }

void SubtitleScreen::DisplayTextSubtitles(void)
{
    if (!InitialiseFont(m_fontStretch) || !m_player || !m_subreader)
        return;

    bool changed = false;
    VideoOutput *vo = m_player->GetVideoOutput();
    if (vo)
    {
        QRect oldsafe = m_safeArea;
        m_safeArea = m_player->GetVideoOutput()->GetSafeRect();
        if (oldsafe != m_safeArea)
        {
            changed = true;
            int height = (m_safeArea.height() * m_textFontZoom) / 2000;
            gTextSubFont->GetFace()->setPixelSize(height);
            gTextSubFont->GetFace()->setItalic(false);
            gTextSubFont->GetFace()->setUnderline(false);
            gTextSubFont->SetColor(Qt::white);
        }
    }
    else
    {
        return;
    }

    VideoFrame *currentFrame = vo->GetLastShownFrame();
    if (!currentFrame)
        return;

    TextSubtitles *subs = m_subreader->GetTextSubtitles();
    subs->Lock();
    uint64_t playPos = 0;
    if (subs->IsFrameBasedTiming())
    {
        // frame based subtitles get out of synch after running mythcommflag
        // for the file, i.e., the following number is wrong and does not
        // match the subtitle frame numbers:
        playPos = currentFrame->frameNumber;
    }
    else
    {
        // Use timecodes for time based SRT subtitles. Feeding this into
        // NormalizeVideoTimecode() should adjust for non-zero start times
        // and wraps. For MPEG, wraps will occur just once every 26.5 hours
        // and other formats less frequently so this should be sufficient.
        // Note: timecodes should now always be valid even in the case
        // when a frame doesn't have a valid timestamp. If an exception is
        // found where this is not true then we need to use the frameNumber
        // when timecode is not defined by uncommenting the following lines.
        //if (currentFrame->timecode == 0)
        //    playPos = (uint64_t)
        //        ((currentFrame->frameNumber / video_frame_rate) * 1000);
        //else
        playPos = m_player->GetDecoder()->NormalizeVideoTimecode(currentFrame->timecode);
    }
    if (playPos != 0)
        changed |= subs->HasSubtitleChanged(playPos);
    if (!changed)
    {
        subs->Unlock();
        return;
    }

    DeleteAllChildren();
    SetRedraw();
    if (playPos == 0)
    {
        subs->Unlock();
        return;
    }

    QStringList rawsubs = subs->GetSubtitles(playPos);
    if (rawsubs.empty())
    {
        subs->Unlock();
        return;
    }

    OptimiseTextSubs(rawsubs);
    subs->Unlock();
    DrawTextSubtitles(rawsubs, 0, 0);
}

void SubtitleScreen::DisplayAVSubtitles(void)
{
    if (!m_player || !m_subreader)
        return;

    AVSubtitles* subs = m_subreader->GetAVSubtitles();
    QMutexLocker lock(&(subs->lock));
    if (subs->buffers.empty() && (kDisplayAVSubtitle != m_subtitleType))
        return;

    VideoOutput    *videoOut = m_player->GetVideoOutput();
    VideoFrame *currentFrame = videoOut ? videoOut->GetLastShownFrame() : NULL;

    if (!currentFrame || !videoOut)
        return;

    float tmp = 0.0;
    QRect dummy;
    videoOut->GetOSDBounds(dummy, m_safeArea, tmp, tmp, tmp);

    while (!subs->buffers.empty())
    {
        const AVSubtitle subtitle = subs->buffers.front();
        if (subtitle.start_display_time > currentFrame->timecode)
            break;

        ClearDisplayedSubtitles();
        subs->buffers.pop_front();
        for (std::size_t i = 0; i < subtitle.num_rects; ++i)
        {
            AVSubtitleRect* rect = subtitle.rects[i];

            bool displaysub = true;
            if (subs->buffers.size() > 0 &&
                subs->buffers.front().end_display_time <
                currentFrame->timecode)
            {
                displaysub = false;
            }

            if (displaysub && rect->type == SUBTITLE_BITMAP)
            {
                // AVSubtitleRect's image data's not guaranteed to be 4 byte
                // aligned.

                QSize img_size(rect->w, rect->h);
                QRect img_rect(rect->x, rect->y, rect->w, rect->h);
                QRect display(rect->display_x, rect->display_y,
                              rect->display_w, rect->display_h);

                // XSUB and some DVD/DVB subs are based on the original video
                // size before the video was converted. We need to guess the
                // original size and allow for the difference

                int right  = rect->x + rect->w;
                int bottom = rect->y + rect->h;
                if (subs->fixPosition || (currentFrame->height < bottom) ||
                   (currentFrame->width  < right))
                {
                    int sd_height = 576;
                    if ((m_player->GetFrameRate() > 26.0f) && bottom <= 480)
                        sd_height = 480;
                    int height = ((currentFrame->height <= sd_height) &&
                                  (bottom <= sd_height)) ? sd_height :
                                 ((currentFrame->height <= 720) && bottom <= 720)
                                   ? 720 : 1080;
                    int width  = ((currentFrame->width  <= 720) &&
                                  (right <= 720)) ? 720 :
                                 ((currentFrame->width  <= 1280) &&
                                  (right <= 1280)) ? 1280 : 1920;
                    display = QRect(0, 0, width, height);
                }

                QRect scaled = videoOut->GetImageRect(img_rect, &display);
                QImage qImage(img_size, QImage::Format_ARGB32);
                for (int y = 0; y < rect->h; ++y)
                {
                    for (int x = 0; x < rect->w; ++x)
                    {
                        const uint8_t color = rect->pict.data[0][y*rect->pict.linesize[0] + x];
                        const uint32_t pixel = *((uint32_t*)rect->pict.data[1]+color);
                        qImage.setPixel(x, y, pixel);
                    }
                }

                if (scaled.size() != img_size)
                {
                    qImage = qImage.scaled(scaled.width(), scaled.height(),
                             Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
                }

                MythPainter *osd_painter = videoOut->GetOSDPainter();
                MythImage* image = NULL;
                if (osd_painter)
                   image = osd_painter->GetFormatImage();

                long long displayfor = subtitle.end_display_time -
                                       subtitle.start_display_time;
                if (displayfor == 0)
                    displayfor = 60000;
//.........这里部分代码省略.........