LPDIRECTSOUNDBUFFER lpSoundBuffer;    DSBUFFERDESC dsbd;    DSBCAPS dsbc;    WAVEFORMATEX wfx;    if (lpWave != NULL) {        lpWave->dwHandle = 0;        /* setup waveform format */        wfx.wFormatTag = WAVE_FORMAT_PCM;        wfx.nChannels = 1;        wfx.wBitsPerSample = lpWave->wFormat & AUDIO_FORMAT_16BITS ? 16 : 8;        wfx.nSamplesPerSec = lpWave->nSampleRate;        wfx.nAvgBytesPerSec = lpWave->nSampleRate;        wfx.nBlockAlign = 1;        wfx.cbSize = 0;        if (lpWave->wFormat & AUDIO_FORMAT_16BITS) {	    wfx.nAvgBytesPerSec <<= 1;	    wfx.nBlockAlign <<= 1;        }                /* setup sound buffer description */        dsbd.dwSize = sizeof(dsbd);        dsbd.dwFlags = DSBCAPS_CTRLPAN | DSBCAPS_CTRLVOLUME |	    DSBCAPS_CTRLFREQUENCY | DSBCAPS_STICKYFOCUS |	    DSBCAPS_GETCURRENTPOSITION2 | DSBCAPS_LOCSOFTWARE;        dsbd.dwBufferBytes = lpWave->dwLength;        dsbd.dwReserved = 0;        dsbd.lpwfxFormat = &wfx;        /* create sound buffer object */        if (DS.lpDirectSound->lpVtbl->CreateSoundBuffer(DS.lpDirectSound,							&dsbd, &lpSoundBuffer, NULL) != DS_OK) {            MSGBOX("Can't create DirectSoundBuffer object");            return AUDIO_ERROR_NOMEMORY;        }        lpWave->dwHandle = (DWORD) lpSoundBuffer;            return AUDIO_ERROR_NONE;    }    return AUDIO_ERROR_INVALPARAM;}static UINT AIAPI DestroyAudioData(LPAUDIOWAVE lpWave){    LPDIRECTSOUNDBUFFER lpSoundBuffer;    if (lpWave != NULL && lpWave->dwHandle != 0) {        lpSoundBuffer = (LPDIRECTSOUNDBUFFER) lpWave->dwHandle;        lpSoundBuffer->lpVtbl->Stop(lpSoundBuffer);        lpSoundBuffer->lpVtbl->Release(lpSoundBuffer);        lpWave->dwHandle = 0;        return AUDIO_ERROR_NONE;    }    return AUDIO_ERROR_INVALPARAM;}static UINT AIAPI WriteAudioData(LPAUDIOWAVE lpWave, DWORD dwOffset, UINT nCount){    LPDIRECTSOUNDBUFFER lpSoundBuffer;    LPVOID lpPtr1, lpPtr2;    DWORD dwBytes1, dwBytes2;    UINT i;    if (lpWave != NULL && lpWave->dwHandle != 0 && lpWave->lpData != NULL) {        if (dwOffset + nCount <= lpWave->dwLength) {            lpSoundBuffer = (LPDIRECTSOUNDBUFFER) lpWave->dwHandle;            /* lock sound buffer in memory */            if (lpSoundBuffer->lpVtbl->Lock(lpSoundBuffer, dwOffset, nCount,					    &lpPtr1, &dwBytes1, &lpPtr2, &dwBytes2, 0) == DS_OK) {                /* copy samples to the sound buffer (convert to unsigned) */                if (lpWave->wFormat & AUDIO_FORMAT_16BITS) {                    memcpy(lpPtr1, lpWave->lpData + dwOffset, dwBytes1);                }                else {                    for (i = 0; i < dwBytes1; i++)                        ((LPBYTE)lpPtr1)[i] = lpWave->lpData[dwOffset++] ^ 0x80;                }                /* unlock the sound buffer from memory */                lpSoundBuffer->lpVtbl->Unlock(lpSoundBuffer, lpPtr1,					      dwBytes1, lpPtr2, dwBytes2);                return AUDIO_ERROR_NONE;            }            else {                MSGBOX("Can't lock DirectSoundBuffer memory");                lpSoundBuffer->lpVtbl->Restore(lpSoundBuffer);            }        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI PrimeVoice(UINT nVoice, LPAUDIOWAVE lpWave){    LPDIRECTSOUNDBUFFER lpSoundBuffer;        if (nVoice < AUDIO_MAX_VOICES && lpWave != NULL) {        lpSoundBuffer = (LPDIRECTSOUNDBUFFER) lpWave->dwHandle;        /* release the sound buffer for this voice */        if (DS.aSoundBuffer[nVoice] != NULL) {            DS.aSoundBuffer[nVoice]->lpVtbl->Stop(DS.aSoundBuffer[nVoice]);            DS.aSoundBuffer[nVoice]->lpVtbl->Release(DS.aSoundBuffer[nVoice]);            DS.aSoundBuffer[nVoice] = NULL;        }        /* create a duplicate sound buffer */        if (DS.lpDirectSound->lpVtbl->DuplicateSoundBuffer(DS.lpDirectSound,							   lpSoundBuffer, &DS.aSoundBuffer[nVoice]) != DS_OK) {            MSGBOX("Can't duplicate DirectSoundBuffer object");            return AUDIO_ERROR_NOMEMORY;        }                /* setup frequency, volume and panning */        DS.aSoundBuffer[nVoice]->lpVtbl->SetCurrentPosition(DS.aSoundBuffer[nVoice], 0);        DS.aSoundBuffer[nVoice]->lpVtbl->SetFrequency(DS.aSoundBuffer[nVoice],						      DS.aFrequencyTable[nVoice]);        DS.aSoundBuffer[nVoice]->lpVtbl->SetVolume(DS.aSoundBuffer[nVoice],						   DS.aLogVolumeTable[DS.aVolumeTable[nVoice]]);        DS.aSoundBuffer[nVoice]->lpVtbl->SetPan(DS.aSoundBuffer[nVoice],						DS.aLogPanningTable[DS.aPanningTable[nVoice]]);        /* save format of the sound buffer */        DS.aFormatTable[nVoice] = lpWave->wFormat;        return AUDIO_ERROR_NONE;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI StartVoice(UINT nVoice){    DWORD dwFlags;    if (nVoice < AUDIO_MAX_VOICES) {        // FIXME: handle looping samples!        if (DS.aSoundBuffer[nVoice] != NULL) {            dwFlags = (DS.aFormatTable[nVoice] & AUDIO_FORMAT_LOOP ? DSBPLAY_LOOPING : 0);            if (DS.aSoundBuffer[nVoice]->lpVtbl->Play(DS.aSoundBuffer[nVoice],						      0, 0, dwFlags) != DS_OK) {                MSGBOX("Can't play DirectSoundBuffer object");                return AUDIO_ERROR_INVALHANDLE;            }        }        return AUDIO_ERROR_NONE;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI StopVoice(UINT nVoice){    if (nVoice < AUDIO_MAX_VOICES) {        if (DS.aSoundBuffer[nVoice] != NULL) {            if (DS.aSoundBuffer[nVoice]->lpVtbl->Stop(DS.aSoundBuffer[nVoice]) != DS_OK) {                MSGBOX("Can't stop DirectSoundBuffer object");                return AUDIO_ERROR_INVALHANDLE;            }        }        return AUDIO_ERROR_NONE;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI SetVoicePosition(UINT nVoice, LONG dwPosition){    if (nVoice < AUDIO_MAX_VOICES) {        if (dwPosition >= AUDIO_MIN_POSITION &&            dwPosition <= AUDIO_MAX_POSITION) {            // FIXME: adjust position for 16-bit samples            if (DS.aSoundBuffer[nVoice] != NULL) {                DS.aSoundBuffer[nVoice]->lpVtbl->SetCurrentPosition(DS.aSoundBuffer[nVoice], dwPosition);            }            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI SetVoiceFrequency(UINT nVoice, LONG dwFrequency){    if (nVoice < AUDIO_MAX_VOICES) {        if (dwFrequency >= AUDIO_MIN_FREQUENCY &&            dwFrequency <= AUDIO_MAX_FREQUENCY) {            DS.aFrequencyTable[nVoice] = dwFrequency;            if (DS.aSoundBuffer[nVoice] != NULL) {                if (DS.aSoundBuffer[nVoice]->lpVtbl->SetFrequency(DS.aSoundBuffer[nVoice], dwFrequency) != DS_OK)                    MSGBOX("Can't change DirectSoundBuffer frequency");            }            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI SetVoiceVolume(UINT nVoice, UINT nVolume){    if (nVoice < AUDIO_MAX_VOICES) {        if (nVolume < AUDIO_MAX_VOLUME) {            DS.aVolumeTable[nVoice] = nVolume;            if (DS.aSoundBuffer[nVoice] != NULL) {                if (DS.aSoundBuffer[nVoice]->lpVtbl->SetVolume(DS.aSoundBuffer[nVoice], DS.aLogVolumeTable[nVolume]) != DS_OK)                    MSGBOX("Can't change DirectSoundBuffer volume");            }            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI SetVoicePanning(UINT nVoice, UINT nPanning){    if (nVoice < AUDIO_MAX_VOICES) {        if (nPanning < AUDIO_MAX_PANNING) {            DS.aPanningTable[nVoice] = nPanning;            if (DS.aSoundBuffer[nVoice] != NULL) {                if (DS.aSoundBuffer[nVoice]->lpVtbl->SetPan(DS.aSoundBuffer[nVoice], DS.aLogPanningTable[nPanning]) != DS_OK)                    MSGBOX("Can't change DirectSoundBuffer panning");            }            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI GetVoicePosition(UINT nVoice, LPLONG lpdwPosition){    DWORD dwWritePosition;    if (nVoice < AUDIO_MAX_VOICES) {        if (lpdwPosition != NULL) {            *lpdwPosition = 0L;            if (DS.aSoundBuffer[nVoice] != NULL) {                if (DS.aSoundBuffer[nVoice]->lpVtbl->GetCurrentPosition(                    DS.aSoundBuffer[nVoice], lpdwPosition, &dwWritePosition) != DS_OK)                    *lpdwPosition = 0L;            }            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI GetVoiceFrequency(UINT nVoice, LPLONG lpdwFrequency){    if (nVoice < AUDIO_MAX_VOICES) {        if (lpdwFrequency != NULL) {            *lpdwFrequency = DS.aFrequencyTable[nVoice];            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI GetVoiceVolume(UINT nVoice, LPUINT lpnVolume){    if (nVoice < AUDIO_MAX_VOICES) {        if (lpnVolume != NULL) {            *lpnVolume = DS.aVolumeTable[nVoice];            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI GetVoicePanning(UINT nVoice, LPUINT lpnPanning){    if (nVoice < AUDIO_MAX_VOICES) {        if (lpnPanning != NULL) {            *lpnPanning = DS.aPanningTable[nVoice];            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}static UINT AIAPI GetVoiceStatus(UINT nVoice, LPBOOL lpnStatus){    if (nVoice < AUDIO_MAX_VOICES) {        if (lpnStatus != NULL) {            *lpnStatus = 1;            if (DS.aSoundBuffer[nVoice] != NULL) {                if (DS.aSoundBuffer[nVoice]->lpVtbl->GetStatus(DS.aSoundBuffer[nVoice], lpnStatus) != DS_OK)                     MSGBOX("Can't getDirectSoundBuffer status");;                *lpnStatus = (*lpnStatus & DSBSTATUS_PLAYING ? 0 : 1);            }            return AUDIO_ERROR_NONE;        }        return AUDIO_ERROR_INVALPARAM;    }    return AUDIO_ERROR_INVALHANDLE;}/* * DirectSound audio driver public interface */static AUDIOWAVEDRIVER DirectSoundWaveDriver ={    GetAudioCaps, PingAudio, OpenAudio, CloseAudio,    UpdateAudio, SetAudioCallback};static AUDIOSYNTHDRIVER DirectSoundSynthDriver ={    GetAudioCaps, PingAudio, OpenAudio, CloseAudio,    UpdateAudioSynth, OpenVoices, CloseVoices,    SetAudioTimerProc, SetAudioTimerRate, SetAudioMixerValue,    GetAudioDataAvail, CreateAudioData, DestroyAudioData,    WriteAudioData, PrimeVoice, StartVoice, StopVoice,    SetVoicePosition, SetVoiceFrequency, SetVoiceVolume,    SetVoicePanning, GetVoicePosition, GetVoiceFrequency,    GetVoiceVolume, GetVoicePanning, GetVoiceStatus};AUDIODRIVER DirectSoundAccelDriver ={    &DirectSoundWaveDriver, &DirectSoundSynthDriver};