snd_dma.c

来自「quake1 dos源代码最新版本」· C语言 代码 · 共 1,059 行 · 第 1/2 页

// if an identical sound has also been started this frame, offset the pos
// a bit to keep it from just making the first one louder
	check = &channels[NUM_AMBIENTS];
    for (ch_idx=NUM_AMBIENTS ; ch_idx < NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS ; ch_idx++, check++)
    {
		if (check == target_chan)
			continue;
		if (check->sfx == sfx && !check->pos)
		{
			skip = rand () % (int)(0.1*shm->speed);
			if (skip >= target_chan->end)
				skip = target_chan->end - 1;
			target_chan->pos += skip;
			target_chan->end -= skip;
			break;
		}

	}
}

void S_StopSound(int entnum, int entchannel)
{
	int i;

	for (i=0 ; i<MAX_DYNAMIC_CHANNELS ; i++)
	{
		if (channels[i].entnum == entnum
			&& channels[i].entchannel == entchannel)
		{
			channels[i].end = 0;
			channels[i].sfx = NULL;
			return;
		}
	}
}

void S_StopAllSounds(qboolean clear)
{
	int		i;

	if (!sound_started)
		return;

	total_channels = MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS;	// no statics

	for (i=0 ; i<MAX_CHANNELS ; i++)
		if (channels[i].sfx)
			channels[i].sfx = NULL;

	Q_memset(channels, 0, MAX_CHANNELS * sizeof(channel_t));

	if (clear)
		S_ClearBuffer ();
}

void S_StopAllSoundsC (void)
{
	S_StopAllSounds (true);
}

void S_ClearBuffer (void)
{
	int		clear;

#ifdef _WIN32
	if (!sound_started || !shm || (!shm->buffer && !pDSBuf))
#else
	if (!sound_started || !shm || !shm->buffer)
#endif
		return;

	if (shm->samplebits == 8)
		clear = 0x80;
	else
		clear = 0;

#ifdef _WIN32
	if (pDSBuf)
	{
		DWORD	dwSize;
		DWORD	*pData;
		int		reps;
		HRESULT	hresult;

		reps = 0;

		while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pData, &dwSize, NULL, NULL, 0)) != DS_OK)
		{
			if (hresult != DSERR_BUFFERLOST)
			{
				Con_Printf ("S_ClearBuffer: DS::Lock Sound Buffer Failed\n");
				S_Shutdown ();
				return;
			}

			if (++reps > 10000)
			{
				Con_Printf ("S_ClearBuffer: DS: couldn't restore buffer\n");
				S_Shutdown ();
				return;
			}
		}

		Q_memset(pData, clear, shm->samples * shm->samplebits/8);

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

	}
	else
#endif
	{
		Q_memset(shm->buffer, clear, shm->samples * shm->samplebits/8);
	}
}


/*
=================
S_StaticSound
=================
*/
void S_StaticSound (sfx_t *sfx, vec3_t origin, float vol, float attenuation)
{
	channel_t	*ss;
	sfxcache_t		*sc;

	if (!sfx)
		return;

	if (total_channels == MAX_CHANNELS)
	{
		Con_Printf ("total_channels == MAX_CHANNELS\n");
		return;
	}

	ss = &channels[total_channels];
	total_channels++;

	sc = S_LoadSound (sfx);
	if (!sc)
		return;

	if (sc->loopstart == -1)
	{
		Con_Printf ("Sound %s not looped\n", sfx->name);
		return;
	}

	ss->sfx = sfx;
	VectorCopy (origin, ss->origin);
	ss->master_vol = vol;
	ss->dist_mult = (attenuation/64) / sound_nominal_clip_dist;
    ss->end = paintedtime + sc->length;

	SND_Spatialize (ss);
}


//=============================================================================

/*
===================
S_UpdateAmbientSounds
===================
*/
void S_UpdateAmbientSounds (void)
{
	mleaf_t		*l;
	float		vol;
	int			ambient_channel;
	channel_t	*chan;

	if (!snd_ambient)
		return;

// calc ambient sound levels
	if (!cl.worldmodel)
		return;

	l = Mod_PointInLeaf (listener_origin, cl.worldmodel);
	if (!l || !ambient_level->value)
	{
		for (ambient_channel = 0 ; ambient_channel< NUM_AMBIENTS ; ambient_channel++)
			channels[ambient_channel].sfx = NULL;
		return;
	}

	for (ambient_channel = 0 ; ambient_channel< NUM_AMBIENTS ; ambient_channel++)
	{
		chan = &channels[ambient_channel];
		chan->sfx = ambient_sfx[ambient_channel];

		vol = ambient_level->value * l->ambient_sound_level[ambient_channel];
		if (vol < 8)
			vol = 0;

	// don't adjust volume too fast
		if (chan->master_vol < vol)
		{
// 2001-10-20 TIMESCALE extension by Tomaz/Maddes  start
//			chan->master_vol += host_frametime * ambient_fade->value;
// as there's no way to slow down sound in original code
			chan->master_vol += host_org_frametime * ambient_fade->value;
// 2001-10-20 TIMESCALE extension by Tomaz/Maddes  end
			if (chan->master_vol > vol)
				chan->master_vol = vol;
		}
		else if (chan->master_vol > vol)
		{
// 2001-10-20 TIMESCALE extension by Tomaz/Maddes  start
//			chan->master_vol -= host_frametime * ambient_fade->value;
// as there's no way to slow down sound in original code
			chan->master_vol -= host_org_frametime * ambient_fade->value;
// 2001-10-20 TIMESCALE extension by Tomaz/Maddes  end
			if (chan->master_vol < vol)
				chan->master_vol = vol;
		}

		chan->leftvol = chan->rightvol = chan->master_vol;
	}
}


/*
============
S_Update

Called once each time through the main loop
============
*/
void S_Update(vec3_t origin, vec3_t forward, vec3_t right, vec3_t up)
{
	int			i, j;
	int			total;
	channel_t	*ch;
	channel_t	*combine;

	if (!sound_started || (snd_blocked > 0))
		return;

	VectorCopy(origin, listener_origin);
	VectorCopy(forward, listener_forward);
	VectorCopy(right, listener_right);
	VectorCopy(up, listener_up);

// update general area ambient sound sources
	S_UpdateAmbientSounds ();

	combine = NULL;

// update spatialization for static and dynamic sounds
	ch = channels+NUM_AMBIENTS;
	for (i=NUM_AMBIENTS ; i<total_channels; i++, ch++)
	{
		if (!ch->sfx)
			continue;
		SND_Spatialize(ch);	// respatialize channel
		if (!ch->leftvol && !ch->rightvol)
			continue;

	// try to combine static sounds with a previous channel of the same
	// sound effect so we don't mix five torches every frame

		if (i >= MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS)
		{
		// see if it can just use the last one
			if (combine && combine->sfx == ch->sfx)
			{
				combine->leftvol += ch->leftvol;
				combine->rightvol += ch->rightvol;
				ch->leftvol = ch->rightvol = 0;
				continue;
			}
		// search for one
			combine = channels+MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS;
			for (j=MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS ; j<i; j++, combine++)
				if (combine->sfx == ch->sfx)
					break;

			if (j == total_channels)
			{
				combine = NULL;
			}
			else
			{
				if (combine != ch)
				{
					combine->leftvol += ch->leftvol;
					combine->rightvol += ch->rightvol;
					ch->leftvol = ch->rightvol = 0;
				}
				continue;
			}
		}


	}

//
// debugging output
//
	if (snd_show->value)
	{
		total = 0;
		ch = channels;
		for (i=0 ; i<total_channels; i++, ch++)
			if (ch->sfx && (ch->leftvol || ch->rightvol) )
			{
				//Con_Printf ("%3i %3i %s\n", ch->leftvol, ch->rightvol, ch->sfx->name);
				total++;
			}

		Con_Printf ("----(%i)----\n", total);
	}

// mix some sound
	S_Update_();
}

void GetSoundtime(void)
{
	int		samplepos;
	static	int		buffers;
	static	int		oldsamplepos;
	int		fullsamples;

	fullsamples = shm->samples / shm->channels;

// it is possible to miscount buffers if it has wrapped twice between
// calls to S_Update.  Oh well.
#ifdef __sun__
	soundtime = SNDDMA_GetSamples();
#else
	samplepos = SNDDMA_GetDMAPos();


	if (samplepos < oldsamplepos)
	{
		buffers++;					// buffer wrapped

		if (paintedtime > 0x40000000)
		{	// time to chop things off to avoid 32 bit limits
			buffers = 0;
			paintedtime = fullsamples;
			S_StopAllSounds (true);
		}
	}
	oldsamplepos = samplepos;

	soundtime = buffers*fullsamples + samplepos/shm->channels;
#endif
}

void S_ExtraUpdate (void)
{

#ifdef _WIN32
	IN_Accumulate ();
#endif

	if (snd_noextraupdate->value)
		return;		// don't pollute timings
	S_Update_();
}

void S_Update_(void)
{
	unsigned	endtime;
	int			samps;

	if (!sound_started || (snd_blocked > 0))
		return;

// Updates DMA time
	GetSoundtime();

// check to make sure that we haven't overshot
	if (paintedtime < soundtime)
	{
		//Con_Printf ("S_Update_ : overflow\n");
		paintedtime = soundtime;
	}

// mix ahead of current position
	endtime = soundtime + _snd_mixahead->value * shm->speed;
	samps = shm->samples >> (shm->channels-1);
	if (endtime - soundtime > samps)
		endtime = soundtime + samps;

#ifdef _WIN32
// if the buffer was lost or stopped, restore it and/or restart it
	{
		DWORD	dwStatus;

		if (pDSBuf)
		{
			if (pDSBuf->lpVtbl->GetStatus (pDSBuf, &dwStatus) != DD_OK)
				Con_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);
		}
	}
#endif

	S_PaintChannels (endtime);

	SNDDMA_Submit ();
}

/*
===============================================================================

console functions

===============================================================================
*/

void S_Play(void)
{
	static int hash=345;
	int 	i;
	char name[256];
	sfx_t	*sfx;

	i = 1;
	while (i<Cmd_Argc())
	{
		if (!strrchr(Cmd_Argv(i), '.'))
		{
			strcpy(name, Cmd_Argv(i));
			strcat(name, ".wav");
		}
		else
			strcpy(name, Cmd_Argv(i));
		sfx = S_PrecacheSound(name);
		S_StartSound(hash++, 0, sfx, listener_origin, 1.0, 1.0);
		i++;
	}
}

void S_PlayVol(void)
{
	static int hash=543;
	int i;
	float vol;
	char name[256];
	sfx_t	*sfx;

	i = 1;
	while (i<Cmd_Argc())
	{
		if (!strrchr(Cmd_Argv(i), '.'))
		{
			strcpy(name, Cmd_Argv(i));
			strcat(name, ".wav");
		}
		else
			strcpy(name, Cmd_Argv(i));
		sfx = S_PrecacheSound(name);
		vol = Q_atof(Cmd_Argv(i+1));
		S_StartSound(hash++, 0, sfx, listener_origin, vol, 1.0);
		i+=2;
	}
}

void S_SoundList(void)
{
	int		i;
	sfx_t	*sfx;
	sfxcache_t	*sc;
	int		size, total;

	total = 0;
	for (sfx=known_sfx, i=0 ; i<num_sfx ; i++, sfx++)
	{
		sc = Cache_Check (&sfx->cache);
		if (!sc)
			continue;
		size = sc->length*sc->width*(sc->stereo+1);
		total += size;
		if (sc->loopstart >= 0)
			Con_Printf ("L");
		else
			Con_Printf (" ");
		Con_Printf("(%2db) %6i : %s\n",sc->width*8,  size, sfx->name);
	}
	Con_Printf ("Total resident: %i\n", total);
}


void S_LocalSound (char *sound)
{
	sfx_t	*sfx;

	if (nosound->value)
		return;
	if (!sound_started)
		return;

	sfx = S_PrecacheSound (sound);
	if (!sfx)
	{
		Con_Printf ("S_LocalSound: can't cache %s\n", sound);
		return;
	}
	S_StartSound (cl.viewentity, -1, sfx, vec3_origin, 1, 1);
}


void S_ClearPrecache (void)
{
}


void S_BeginPrecaching (void)
{
}


void S_EndPrecaching (void)
{
}