C++ (Cpp) SavePreview Examples

Example #1

bool PreviewGenerator::LocalPreviewRun(void)
{
    programInfo.MarkAsInUse(true, kInUseID);

    float aspect = 0;
    int   len, width, height, sz;
    long long captime = captureTime;
    if (captime < 0)
    {
        timeInSeconds = true;
        captime = (gContext->GetNumSetting("PreviewPixmapOffset", 64) +
                   gContext->GetNumSetting("RecordPreRoll",       0));
    }

    len = width = height = sz = 0;
    unsigned char *data = (unsigned char*)
        GetScreenGrab(&programInfo, pathname,
                      captime, timeInSeconds,
                      sz, width, height, aspect);

    QString outname = CreateAccessibleFilename(pathname, outFileName);

    int dw = (outSize.width()  < 0) ? width  : outSize.width();
    int dh = (outSize.height() < 0) ? height : outSize.height();

    bool ok = SavePreview(outname, data, width, height, aspect, dw, dh);

    if (data)
        delete[] data;

    programInfo.MarkAsInUse(false);

    return ok;
}

Example #2

File: previewgenerator.cpp Project: Openivo/mythtv

bool PreviewGenerator::LocalPreviewRun(void)
{
    programInfo.MarkAsInUse(true, kPreviewGeneratorInUseID);

    float aspect = 0;
    int   width, height, sz;
    long long captime = captureTime;

    QDateTime dt = QDateTime::currentDateTime();

    if (captime > 0)
        LOG(VB_GENERAL, LOG_INFO, "Preview from time spec");

    if (captime < 0)
    {
        captime = programInfo.QueryBookmark();
        if (captime > 0)
        {
            timeInSeconds = false;
            LOG(VB_GENERAL, LOG_INFO,
                QString("Preview from bookmark (frame %1)").arg(captime));
        }
        else
            captime = -1;
    }

    if (captime < 0)
    {
        timeInSeconds = true;
        int startEarly = 0;
        int programDuration = 0;
        int preroll =  gCoreContext->GetNumSetting("RecordPreRoll", 0);
        if (programInfo.GetScheduledStartTime().isValid() &&
            programInfo.GetScheduledEndTime().isValid() &&
            (programInfo.GetScheduledStartTime() !=
             programInfo.GetScheduledEndTime()))
        {
            programDuration = programInfo.GetScheduledStartTime()
                .secsTo(programInfo.GetScheduledEndTime());
        }
        if (programInfo.GetRecordingStartTime().isValid() &&
            programInfo.GetScheduledStartTime().isValid() &&
            (programInfo.GetRecordingStartTime() !=
             programInfo.GetScheduledStartTime()))
        {
            startEarly = programInfo.GetRecordingStartTime()
                .secsTo(programInfo.GetScheduledStartTime());
        }
        if (programDuration > 0)
        {
            captime = startEarly + (programDuration / 3);
        }
        if (captime < 0)
            captime = 600;
        captime += preroll;
        LOG(VB_GENERAL, LOG_INFO,
            QString("Preview at calculated offset (%1 seconds)").arg(captime));
    }

    width = height = sz = 0;
    unsigned char *data = (unsigned char*)
        GetScreenGrab(programInfo, pathname,
                      captime, timeInSeconds,
                      sz, width, height, aspect);

    QString outname = CreateAccessibleFilename(pathname, outFileName);

    int dw = (outSize.width()  < 0) ? width  : outSize.width();
    int dh = (outSize.height() < 0) ? height : outSize.height();

    bool ok = SavePreview(outname, data, width, height, aspect, dw, dh);

    if (ok)
    {
        // Backdate file to start of preview time in case a bookmark was made
        // while we were generating the preview.
        struct utimbuf times;
        times.actime = times.modtime = dt.toTime_t();
        utime(outname.toLocal8Bit().constData(), &times);
    }

    delete[] data;

    programInfo.MarkAsInUse(false, kPreviewGeneratorInUseID);

    return ok;
}