speaker.h File Reference

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Functions
VOID	SpeakerChange (UCHAR Port61hValue)
VOID	SpeakerInitialize (VOID)
VOID	SpeakerCleanup (VOID)

Function Documentation

SpeakerChange()

VOID SpeakerChange

(

UCHAR

Port61hValue

)

Definition at line 196 of file speaker.c.

{
    static BOOLEAN OldSpeakerOff = TRUE;

    BOOLEAN Timer2Gate = !!(Port61hValue & 0x01);
    BOOLEAN SpeakerOn  = !!(Port61hValue & 0x02);

    DPRINT("SpeakerChange -- Timer2Gate == %s ; SpeakerOn == %s\n",
           Timer2Gate ? "true" : "false", SpeakerOn ? "true" : "false");

    if (Timer2Gate)
    {
        if (SpeakerOn)
        {
            /* Start beeping */
            ULONG Frequency = (PIT_BASE_FREQUENCY / PitGetReloadValue(2));
            if (Frequency < MIN_AUDIBLE_FREQ || MAX_AUDIBLE_FREQ < Frequency)
                Frequency = 0;

            MakeBeep(Frequency, INFINITE);
        }
        else
        {
            /* Stop beeping */
            MakeBeep(0, 0);
        }
    }
    else
    {
        if (SpeakerOn)
        {
            if (OldSpeakerOff)
            {
                OldSpeakerOff = FALSE;
                PulseSample();
            }

            if (FreqPulses >= MIN_AUDIBLE_FREQ)
                MakeBeep(FreqPulses, INFINITE);
            else if (CountStart.QuadPart != 0)
                MakeBeep(CLICK_FREQ, 1); /* Click */
            else
                MakeBeep(0, 0);          /* Stop beeping */
        }
        else
        {
            OldSpeakerOff = TRUE;

            /*
             * Check how far away was the previous pulse and if
             * it was >= (200 + eps) ms away then stop beeping.
             */
            if (GetTickCount() - PulseTickCount >= SPEAKER_RESPONSE + (SPEAKER_RESPONSE >> 3))
            {
                CountStart.QuadPart = 0;
                FreqPulses = 0;

                /* Stop beeping */
                MakeBeep(0, 0);
            }
        }
    }
}

Referenced by PitChan2Out(), and Port61hWrite().

SpeakerCleanup()

VOID SpeakerCleanup

(

VOID

)

Definition at line 295 of file speaker.c.

{
    NtClose(hBeep);
}

Referenced by EmulatorCleanup().

SpeakerInitialize()

VOID SpeakerInitialize

(

VOID

)

Definition at line 260 of file speaker.c.

{
    NTSTATUS Status;
    UNICODE_STRING BeepDevice;
    OBJECT_ATTRIBUTES ObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;

    /* Retrieve the performance frequency and initialize the timer ticks */
    NtQueryPerformanceCounter(&CountStart, &FreqCount);
    if (FreqCount.QuadPart == 0)
    {
        wprintf(L"FATAL: Performance counter not available\n");
    }

    /* Open the BEEP device */
    RtlInitUnicodeString(&BeepDevice, L"\\Device\\Beep");
    InitializeObjectAttributes(&ObjectAttributes, &BeepDevice, 0, NULL, NULL);
    Status = NtCreateFile(&hBeep,
                          FILE_READ_DATA | FILE_WRITE_DATA,
                          &ObjectAttributes,
                          &IoStatusBlock,
                          NULL,
                          0,
                          FILE_SHARE_READ | FILE_SHARE_WRITE,
                          FILE_OPEN_IF,
                          0,
                          NULL,
                          0);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("Failed to open the Beep driver, Status 0x%08lx\n", Status);
        // hBeep = INVALID_HANDLE_VALUE;
    }
}

Referenced by EmulatorInitialize().