snd_win.c

quake1 dos源代码最新版本

// initialize the buffer
	reps = 0;

	while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &lpData, &dwSize, NULL, NULL, 0)) != DS_OK)
	{
		if (hresult != DSERR_BUFFERLOST)
		{
			Con_SafePrintf ("SNDDMA_InitDirect: DS::Lock Sound Buffer Failed\n");
			FreeSound ();
			return SIS_FAILURE;
		}

		if (++reps > 10000)
		{
			Con_SafePrintf ("SNDDMA_InitDirect: DS: couldn't restore buffer\n");
			FreeSound ();
			return SIS_FAILURE;
		}

	}

	memset(lpData, 0, dwSize);
//		lpData[4] = lpData[5] = 0x7f;	// force a pop for debugging

	pDSBuf->lpVtbl->Unlock(pDSBuf, lpData, dwSize, NULL, 0);

	/* we don't want anyone to access the buffer directly w/o locking it first. */
	lpData = NULL;

	pDSBuf->lpVtbl->Stop(pDSBuf);
	pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &mmstarttime.u.sample, &dwWrite);
	pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);

	shm->soundalive = true;
	shm->splitbuffer = false;
	shm->samples = gSndBufSize/(shm->samplebits/8);
	shm->samplepos = 0;
	shm->submission_chunk = 1;
	shm->buffer = (unsigned char *) lpData;
	sample16 = (shm->samplebits/8) - 1;

	dsound_init = true;

	return SIS_SUCCESS;
}


/*
==================
SNDDM_InitWav

Crappy windows multimedia base
==================
*/
qboolean SNDDMA_InitWav (void)
{
	WAVEFORMATEX  format;
	int				i;
	HRESULT			hr;

	snd_sent = 0;
	snd_completed = 0;

	shm = &sn;

	shm->channels = 2;
	shm->samplebits = 16;
	shm->speed = 11025;

	memset (&format, 0, sizeof(format));
	format.wFormatTag = WAVE_FORMAT_PCM;
	format.nChannels = shm->channels;
	format.wBitsPerSample = shm->samplebits;
	format.nSamplesPerSec = shm->speed;
	format.nBlockAlign = format.nChannels
		*format.wBitsPerSample / 8;
	format.cbSize = 0;
	format.nAvgBytesPerSec = format.nSamplesPerSec
		*format.nBlockAlign;

	/* Open a waveform device for output using window callback. */
	while ((hr = waveOutOpen((LPHWAVEOUT)&hWaveOut, WAVE_MAPPER,
					&format,
					0, 0L, CALLBACK_NULL)) != MMSYSERR_NOERROR)
	{
		if (hr != MMSYSERR_ALLOCATED)
		{
			Con_SafePrintf ("waveOutOpen failed\n");
			return false;
		}

		if (MessageBox (NULL,
						"The sound hardware is in use by another app.\n\n"
					    "Select Retry to try to start sound again or Cancel to run Quake with no sound.",
						"Sound not available",
						MB_RETRYCANCEL | MB_SETFOREGROUND | MB_ICONEXCLAMATION) != IDRETRY)
		{
			Con_SafePrintf ("waveOutOpen failure;\n"
							"  hardware already in use\n");
			return false;
		}
	}

	/*
	 * Allocate and lock memory for the waveform data. The memory
	 * for waveform data must be globally allocated with
	 * GMEM_MOVEABLE and GMEM_SHARE flags.

	*/
	gSndBufSize = WAV_BUFFERS*WAV_BUFFER_SIZE;
	hData = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, gSndBufSize);
	if (!hData)
	{
		Con_SafePrintf ("Sound: Out of memory.\n");
		FreeSound ();
		return false;
	}
	lpData = GlobalLock(hData);
	if (!lpData)
	{
		Con_SafePrintf ("Sound: Failed to lock.\n");
		FreeSound ();
		return false;
	}
	memset (lpData, 0, gSndBufSize);

	/*
	 * Allocate and lock memory for the header. This memory must
	 * also be globally allocated with GMEM_MOVEABLE and
	 * GMEM_SHARE flags.
	 */
	hWaveHdr = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE,
		(DWORD) sizeof(WAVEHDR) * WAV_BUFFERS);

	if (hWaveHdr == NULL)
	{
		Con_SafePrintf ("Sound: Failed to Alloc header.\n");
		FreeSound ();
		return false;
	}

	lpWaveHdr = (LPWAVEHDR) GlobalLock(hWaveHdr);

	if (lpWaveHdr == NULL)
	{
		Con_SafePrintf ("Sound: Failed to lock header.\n");
		FreeSound ();
		return false;
	}

	memset (lpWaveHdr, 0, sizeof(WAVEHDR) * WAV_BUFFERS);

	/* After allocation, set up and prepare headers. */
	for (i=0 ; i<WAV_BUFFERS ; i++)
	{
		lpWaveHdr[i].dwBufferLength = WAV_BUFFER_SIZE;
		lpWaveHdr[i].lpData = lpData + i*WAV_BUFFER_SIZE;

		if (waveOutPrepareHeader(hWaveOut, lpWaveHdr+i, sizeof(WAVEHDR)) !=
				MMSYSERR_NOERROR)
		{
			Con_SafePrintf ("Sound: failed to prepare wave headers\n");
			FreeSound ();
			return false;
		}
	}

	shm->soundalive = true;
	shm->splitbuffer = false;
	shm->samples = gSndBufSize/(shm->samplebits/8);
	shm->samplepos = 0;
	shm->submission_chunk = 1;
	shm->buffer = (unsigned char *) lpData;
	sample16 = (shm->samplebits/8) - 1;

	wav_init = true;

	return true;
}

/*
==================
SNDDMA_Init

Try to find a sound device to mix for.
Returns false if nothing is found.
==================
*/

// 2001-12-10 Compilable with LCC-Win32 by Jeff Ford  start
//int SNDDMA_Init(void)
qboolean SNDDMA_Init(void)
// 2001-12-10 Compilable with LCC-Win32 by Jeff Ford  end
{
	sndinitstat	stat;

	if (COM_CheckParm ("-wavonly"))
		wavonly = true;

	dsound_init = wav_init = 0;

	stat = SIS_FAILURE;	// assume DirectSound won't initialize

	/* Init DirectSound */
	if (!wavonly)
	{
		if (snd_firsttime || snd_isdirect)
		{
			stat = SNDDMA_InitDirect ();;

			if (stat == SIS_SUCCESS)
			{
				snd_isdirect = true;

				if (snd_firsttime)
					Con_SafePrintf ("DirectSound initialized\n");
			}
			else
			{
				snd_isdirect = false;
				Con_SafePrintf ("DirectSound failed to init\n");
			}
		}
	}

// if DirectSound didn't succeed in initializing, try to initialize
// waveOut sound, unless DirectSound failed because the hardware is
// already allocated (in which case the user has already chosen not
// to have sound)
	if (!dsound_init && (stat != SIS_NOTAVAIL))
	{
		if (snd_firsttime || snd_iswave)
		{

			snd_iswave = SNDDMA_InitWav ();

			if (snd_iswave)
			{
				if (snd_firsttime)
					Con_SafePrintf ("Wave sound initialized\n");
			}
			else
			{
				Con_SafePrintf ("Wave sound failed to init\n");
			}
		}
	}

	snd_firsttime = false;

	if (!dsound_init && !wav_init)
	{
		if (snd_firsttime)
			Con_SafePrintf ("No sound device initialized\n");

		return 0;
	}

	return 1;
}

/*
==============
SNDDMA_GetDMAPos

return the current sample position (in mono samples read)
inside the recirculating dma buffer, so the mixing code will know
how many sample are required to fill it up.
===============
*/
int SNDDMA_GetDMAPos(void)
{
	MMTIME	mmtime;
	int		s;
	DWORD	dwWrite;

	if (dsound_init)
	{
		mmtime.wType = TIME_SAMPLES;
		pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &mmtime.u.sample, &dwWrite);
		s = mmtime.u.sample - mmstarttime.u.sample;
	}
	else if (wav_init)
	{
		s = snd_sent * WAV_BUFFER_SIZE;
	}


	s >>= sample16;

	s &= (shm->samples-1);

	return s;
}

/*
==============
SNDDMA_Submit

Send sound to device if buffer isn't really the dma buffer
===============
*/
void SNDDMA_Submit(void)
{
	LPWAVEHDR	h;
	int			wResult;

	if (!wav_init)
		return;

	//
	// find which sound blocks have completed
	//
	while (1)
	{
		if ( snd_completed == snd_sent )
		{
			Con_DPrintf ("Sound overrun\n");
			break;
		}

		if ( ! (lpWaveHdr[ snd_completed & WAV_MASK].dwFlags & WHDR_DONE) )
		{
			break;
		}

		snd_completed++;	// this buffer has been played
	}

	//
	// submit two new sound blocks
	//
	while (((snd_sent - snd_completed) >> sample16) < 4)
	{
		h = lpWaveHdr + ( snd_sent&WAV_MASK );

		snd_sent++;
		/*
		 * Now the data block can be sent to the output device. The
		 * waveOutWrite function returns immediately and waveform
		 * data is sent to the output device in the background.
		 */
		wResult = waveOutWrite(hWaveOut, h, sizeof(WAVEHDR));

		if (wResult != MMSYSERR_NOERROR)
		{
			Con_SafePrintf ("Failed to write block to device\n");
			FreeSound ();
			return;
		}
	}
}

/*
==============
SNDDMA_Shutdown

Reset the sound device for exiting
===============
*/
void SNDDMA_Shutdown(void)
{
	FreeSound ();
}