snd_win.c

Quake 2 Source code for students by Theerthan You can also download from idsoftwares.com

	return SIS_SUCCESS;
}


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

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

	Com_Printf( "Initializing wave sound\n" );
	
	snd_sent = 0;
	snd_completed = 0;

	dma.channels = 2;
	dma.samplebits = 16;

	if (s_khz->value == 44)
		dma.speed = 44100;
	if (s_khz->value == 22)
		dma.speed = 22050;
	else
		dma.speed = 11025;

	memset (&format, 0, sizeof(format));
	format.wFormatTag = WAVE_FORMAT_PCM;
	format.nChannels = dma.channels;
	format.wBitsPerSample = dma.samplebits;
	format.nSamplesPerSec = dma.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. */ 
	Com_DPrintf ("...opening waveform device: ");
	while ((hr = waveOutOpen((LPHWAVEOUT)&hWaveOut, WAVE_MAPPER, 
					&format, 
					0, 0L, CALLBACK_NULL)) != MMSYSERR_NOERROR)
	{
		if (hr != MMSYSERR_ALLOCATED)
		{
			Com_Printf ("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 2 with no sound.",
						"Sound not available",
						MB_RETRYCANCEL | MB_SETFOREGROUND | MB_ICONEXCLAMATION) != IDRETRY)
		{
			Com_Printf ("hw in use\n" );
			return false;
		}
	} 
	Com_DPrintf( "ok\n" );

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

	*/ 
	Com_DPrintf ("...allocating waveform buffer: ");
	gSndBufSize = WAV_BUFFERS*WAV_BUFFER_SIZE;
	hData = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, gSndBufSize); 
	if (!hData) 
	{ 
		Com_Printf( " failed\n" );
		FreeSound ();
		return false; 
	}
	Com_DPrintf( "ok\n" );

	Com_DPrintf ("...locking waveform buffer: ");
	lpData = GlobalLock(hData);
	if (!lpData)
	{ 
		Com_Printf( " failed\n" );
		FreeSound ();
		return false; 
	} 
	memset (lpData, 0, gSndBufSize);
	Com_DPrintf( "ok\n" );

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

	if (hWaveHdr == NULL)
	{ 
		Com_Printf( "failed\n" );
		FreeSound ();
		return false; 
	} 
	Com_DPrintf( "ok\n" );

	Com_DPrintf ("...locking waveform header: ");
	lpWaveHdr = (LPWAVEHDR) GlobalLock(hWaveHdr); 

	if (lpWaveHdr == NULL)
	{ 
		Com_Printf( "failed\n" );
		FreeSound ();
		return false; 
	}
	memset (lpWaveHdr, 0, sizeof(WAVEHDR) * WAV_BUFFERS);
	Com_DPrintf( "ok\n" );

	/* After allocation, set up and prepare headers. */ 
	Com_DPrintf ("...preparing 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)
		{
			Com_Printf ("failed\n");
			FreeSound ();
			return false;
		}
	}
	Com_DPrintf ("ok\n");

	dma.samples = gSndBufSize/(dma.samplebits/8);
	dma.samplepos = 0;
	dma.submission_chunk = 512;
	dma.buffer = (unsigned char *) lpData;
	sample16 = (dma.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.
==================
*/
int SNDDMA_Init(void)
{
	sndinitstat	stat;

	memset ((void *)&dma, 0, sizeof (dma));

	s_wavonly = Cvar_Get ("s_wavonly", "0", 0);

	dsound_init = wav_init = 0;

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

	/* Init DirectSound */
	if (!s_wavonly->value)
	{
		if (snd_firsttime || snd_isdirect)
		{
			stat = SNDDMA_InitDirect ();

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

				if (snd_firsttime)
					Com_Printf ("dsound init succeeded\n" );
			}
			else
			{
				snd_isdirect = false;
				Com_Printf ("*** dsound init failed ***\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)
					Com_Printf ("Wave sound init succeeded\n");
			}
			else
			{
				Com_Printf ("Wave sound init failed\n");
			}
		}
	}

	snd_firsttime = false;

	snd_buffer_count = 1;

	if (!dsound_init && !wav_init)
	{
		if (snd_firsttime)
			Com_Printf ("*** 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 &= (dma.samples-1);

	return s;
}

/*
==============
SNDDMA_BeginPainting

Makes sure dma.buffer is valid
===============
*/
DWORD	locksize;
void SNDDMA_BeginPainting (void)
{
	int		reps;
	DWORD	dwSize2;
	DWORD	*pbuf, *pbuf2;
	HRESULT	hresult;
	DWORD	dwStatus;

	if (!pDSBuf)
		return;

	// if the buffer was lost or stopped, restore it and/or restart it
	if (pDSBuf->lpVtbl->GetStatus (pDSBuf, &dwStatus) != DS_OK)
		Com_Printf ("Couldn't get sound buffer status\n");
	
	if (dwStatus & DSBSTATUS_BUFFERLOST)
		pDSBuf->lpVtbl->Restore (pDSBuf);
	
	if (!(dwStatus & DSBSTATUS_PLAYING))
		pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);

	// lock the dsound buffer

	reps = 0;
	dma.buffer = NULL;

	while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &locksize, 
								   &pbuf2, &dwSize2, 0)) != DS_OK)
	{
		if (hresult != DSERR_BUFFERLOST)
		{
			Com_Printf( "S_TransferStereo16: Lock failed with error '%s'\n", DSoundError( hresult ) );
			S_Shutdown ();
			return;
		}
		else
		{
			pDSBuf->lpVtbl->Restore( pDSBuf );
		}

		if (++reps > 2)
			return;
	}
	dma.buffer = (unsigned char *)pbuf;
}

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

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

	if (!dma.buffer)
		return;

	// unlock the dsound buffer
	if (pDSBuf)
		pDSBuf->lpVtbl->Unlock(pDSBuf, dma.buffer, locksize, NULL, 0);

	if (!wav_init)
		return;

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

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

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

//Com_Printf ("completed %i\n", snd_completed);
	//
	// submit a few new sound blocks
	//
	while (((snd_sent - snd_completed) >> sample16) < 8)
	{
		h = lpWaveHdr + ( snd_sent&WAV_MASK );
	if (paintedtime/256 <= snd_sent)
		break;	//	Com_Printf ("submit overrun\n");
//Com_Printf ("send %i\n", snd_sent);
		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)
		{ 
			Com_Printf ("Failed to write block to device\n");
			FreeSound ();
			return; 
		} 
	}
}

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

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


/*
===========
S_Activate

Called when the main window gains or loses focus.
The window have been destroyed and recreated
between a deactivate and an activate.
===========
*/
void S_Activate (qboolean active)
{
	if ( active )
	{
		if ( pDS && cl_hwnd && snd_isdirect )
		{
			DS_CreateBuffers();
		}
	}
	else
	{
		if ( pDS && cl_hwnd && snd_isdirect )
		{
			DS_DestroyBuffers();
		}
	}
}