BurnItNow Audio CD Duration

void jpWindow::CalculateSize()
{
    BFile f1;
    char temp_char[1024];
    char what[100];
    uint32 angle_temp[100];
    uint32 tracks, i;
    off_t temp, total_audio, total, total_iso, total_vrcd, total_duration;

    total_audio = 0;
    total = 0;
    total_iso = 0;
    total_vrcd = 0;
    total_duration = 0;
    temp = 0;
    nrtracks = 0;

    if (BURN_TYPE == 0) {
        sprintf(what, "Data");
        total_vrcd = total = total_iso = total_audio = 0;
        fStatusBar->SetBarColor(black);
        if (fLeftList->CountItems() > 0) {
            LeftListItem* item1 = (LeftListItem*)fLeftList->ItemAt(0);
            if (item1->fIconBitmap == fLeftList->fISOBitmap) {
                f1.SetTo(&item1->fRef, B_READ_ONLY);
                f1.GetSize(&temp);
                total_iso += temp;
                angle_temp[0] = temp / 1024 / 1024;
                nrtracks = 1;
            } else if (item1->fIconBitmap == fLeftList->fVRCDBitmap) {
                nrtracks = 1;
                total_vrcd = temp = GetVRCDSize();
                angle_temp[0] = temp / 1024 / 1024;
            }
        }
    } else if (BURN_TYPE == 1) {
        sprintf(what, "AudioCD");
        total_vrcd = total = total_iso = total_audio = temp = 0;
        fStatusBar->SetBarColor(orange);
        if (fLeftList->CountItems() > 0) {
            LeftListItem* item1 = (LeftListItem*)fLeftList->ItemAt(0);
            LeftListItem* item2 = (LeftListItem*)fLeftList->ItemAt(1);
            if (item1->fIconBitmap == fLeftList->fAudioBitmap) {
                tracks = fLeftList->CountItems();
                for (i = 0; i < tracks; i++) {
                    item1 = (LeftListItem*)fLeftList->ItemAt(i);
                    f1.SetTo(&item1->fRef, B_READ_ONLY);
                    f1.GetSize(&temp);
                    total_audio += temp;
                    total_duration += item1->fAudioInfo.total_time;
                    angle_temp[i] = temp / 1024 / 1024;
                    nrtracks++;
                }
            } else if (fLeftList->CountItems() > 1) {
                if (item2->fIconBitmap == fLeftList->fAudioBitmap) {
                    tracks = fLeftList->CountItems();
                    for (i = 1; i < tracks; i++) {
                        item1 = (LeftListItem*)fLeftList->ItemAt(i);
                        f1.SetTo(&item1->fRef, B_READ_ONLY);
                        f1.GetSize(&temp);
                        total_audio += temp;
                        total_duration += item1->fAudioInfo.total_time;
                        angle_temp[i - 1] = temp / 1024 / 1024;
                        nrtracks++;
                    }
                }
            }
        }
    } else if (BURN_TYPE == 2) {
        sprintf(what, "MixCD");
        total_vrcd = total = total_iso = total_audio = 0;
        fStatusBar->SetBarColor(greenblue);
        if (fLeftList->CountItems() > 0) {
            LeftListItem* item1 = (LeftListItem*)fLeftList->ItemAt(0);
            LeftListItem* item2 = (LeftListItem*)fLeftList->ItemAt(1);
            if (item1->fIconBitmap == fLeftList->fISOBitmap) {
                nrtracks = 1;
                f1.SetTo(&item1->fRef, B_READ_ONLY);
                f1.GetSize(&temp);
                total_iso = temp;
                angle_temp[nrtracks - 1] = temp / 1024 / 1024;
            } else if (item1->fIconBitmap == fLeftList->fVRCDBitmap) {
                nrtracks = 1;
                total_vrcd = temp = GetVRCDSize();
                angle_temp[nrtracks - 1] = temp / 1024 / 1024;
            }

            if (item1->fIconBitmap == fLeftList->fAudioBitmap) {
                tracks = fLeftList->CountItems();
                for (i = 0; i < tracks; i++) {
                    item1 = (LeftListItem*)fLeftList->ItemAt(i);
                    f1.SetTo(&item1->fRef, B_READ_ONLY);
                    f1.GetSize(&temp);
                    total_audio += temp;
                    nrtracks++;
                    angle_temp[nrtracks - 1] = temp / 1024 / 1024;

                }
            } else if (fLeftList->CountItems() > 1) {
                if (item2->fIconBitmap == fLeftList->fAudioBitmap) {
                    tracks = fLeftList->CountItems();
                    for (i = 1; i < tracks; i++) {
                        item1 = (LeftListItem*)fLeftList->ItemAt(i);
                        f1.SetTo(&item1->fRef, B_READ_ONLY);
                        f1.GetSize(&temp);
                        total_audio += temp;
                        nrtracks++;
                        angle_temp[nrtracks - 1] = temp / 1024 / 1024;
                    }
                }
            }
        }
    }

    total = total_audio + total_iso + total_vrcd;
    if (BURN_TYPE == 1) {
        // Audio CD
        sprintf(temp_char, "%s - [%lld MB of 700 MB/%lld of 80 min (CD) / 4474 MB (DVD5) / 8140 MB (DVD9)]",
            what, total / 1024 / 1024, total_duration / 1000000);
    } else {
        sprintf(temp_char, "%s - [%lld MB of 700 MB (CD) / 4474 MB (DVD5) / 8140 MB (DVD9)]",
            what, total / 1024 / 1024);
    }
    fStatusBar->Reset();
    fStatusBar->SetMaxValue(CDSIZE);
    fStatusBar->Update((total / 1024 / 1024), temp_char);

    for (i = 0; i < nrtracks; i++) {
        if (i == 0)
            angles[i] = ((float)360 / (float)(total / 1024 / 1024)) * (float)angle_temp[i];
        else
            angles[i] = ((float)360 / (float)(total / 1024 / 1024)) * (float)angle_temp[i] + angles[i - 1];
    }
}