X-Git-Url: https://git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=blobdiff_plain;f=snd_mix.c;h=736d6ea1964f54ab7d11485daafde3d5d498f039;hp=1da0fcf6f29bf8b9f08c697e9496213642fc6f10;hb=HEAD;hpb=58085f067a994572314e77c72fbe0de1af9f29f7

diff --git a/snd_mix.c b/snd_mix.c
index 1da0fcf6..d8ea1dbe 100644
--- a/snd_mix.c
+++ b/snd_mix.c
@@ -8,7 +8,7 @@ of the License, or (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
 See the GNU General Public License for more details.
 
@@ -17,259 +17,359 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 */
-// snd_mix.c -- portable code to mix sounds for snd_dma.c
 
 #include "quakedef.h"
+#include "snd_main.h"
 
-#ifdef _WIN32
-#include "winquake.h"
-#else
-#define DWORD	unsigned long
-#endif
+extern cvar_t snd_softclip;
+
+static portable_sampleframe_t paintbuffer[PAINTBUFFER_SIZE];
 
-#define	PAINTBUFFER_SIZE	512
-portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
-int		snd_scaletable[32][256];
-int 	*snd_p, snd_linear_count, snd_vol;
-short	*snd_out;
+extern speakerlayout_t snd_speakerlayout; // for querying the listeners
 
-void Snd_WriteLinearBlastStereo16 (void);
+#ifdef CONFIG_VIDEO_CAPTURE
+static portable_sampleframe_t paintbuffer_unswapped[PAINTBUFFER_SIZE];
 
-extern cvar_t snd_swapstereo;
-void Snd_WriteLinearBlastStereo16 (void)
+static void S_CaptureAVISound(const portable_sampleframe_t *sampleframes, size_t length)
 {
-	int		i;
-	int		val;
+	size_t i;
+	unsigned int j;
+
+	if (!cls.capturevideo.active)
+		return;
 
-	if (snd_swapstereo.value)
+	// undo whatever swapping the channel layout (swapstereo, ALSA) did
+	for(j = 0; j < snd_speakerlayout.channels; ++j)
 	{
-		for (i=0 ; i<snd_linear_count ; i+=2)
-		{
-			val = (snd_p[i+1]*snd_vol)>>8;
-			if (val > 0x7fff)
-				snd_out[i] = 0x7fff;
-			else if (val < (short)0x8000)
-				snd_out[i] = (short)0x8000;
-			else
-				snd_out[i] = val;
-
-			val = (snd_p[i]*snd_vol)>>8;
-			if (val > 0x7fff)
-				snd_out[i+1] = 0x7fff;
-			else if (val < (short)0x8000)
-				snd_out[i+1] = (short)0x8000;
-			else
-				snd_out[i+1] = val;
-		}
+		unsigned int j0 = snd_speakerlayout.listeners[j].channel_unswapped;
+		for(i = 0; i < length; ++i)
+			paintbuffer_unswapped[i].sample[j0] = sampleframes[i].sample[j];
 	}
-	else
+
+	SCR_CaptureVideo_SoundFrame(paintbuffer_unswapped, length);
+}
+#endif
+
+extern cvar_t snd_softclip;
+
+static void S_SoftClipPaintBuffer(portable_sampleframe_t *painted_ptr, int nbframes, int width, int nchannels)
+{
+	int i;
+
+	if((snd_softclip.integer == 1 && width <= 2) || snd_softclip.integer > 1)
 	{
-		for (i=0 ; i<snd_linear_count ; i+=2)
+		portable_sampleframe_t *p = painted_ptr;
+
+#if 0
+/* Soft clipping, the sound of a dream, thanks to Jon Wattes
+   post to Musicdsp.org */
+#define SOFTCLIP(x) (x) = sin(bound(-M_PI/2, (x), M_PI/2)) * 0.25
+#endif
+
+		// let's do a simple limiter instead, seems to sound better
+		static float maxvol = 0;
+		maxvol = max(1.0f, maxvol * (1.0f - nbframes / (0.4f * snd_renderbuffer->format.speed)));
+#define SOFTCLIP(x) if(fabs(x)>maxvol) maxvol=fabs(x); (x) /= maxvol;
+
+		if (nchannels == 8)  // 7.1 surround
+		{
+			for (i = 0;i < nbframes;i++, p++)
+			{
+				SOFTCLIP(p->sample[0]);
+				SOFTCLIP(p->sample[1]);
+				SOFTCLIP(p->sample[2]);
+				SOFTCLIP(p->sample[3]);
+				SOFTCLIP(p->sample[4]);
+				SOFTCLIP(p->sample[5]);
+				SOFTCLIP(p->sample[6]);
+				SOFTCLIP(p->sample[7]);
+			}
+		}
+		else if (nchannels == 6)  // 5.1 surround
+		{
+			for (i = 0; i < nbframes; i++, p++)
+			{
+				SOFTCLIP(p->sample[0]);
+				SOFTCLIP(p->sample[1]);
+				SOFTCLIP(p->sample[2]);
+				SOFTCLIP(p->sample[3]);
+				SOFTCLIP(p->sample[4]);
+				SOFTCLIP(p->sample[5]);
+			}
+		}
+		else if (nchannels == 4)  // 4.0 surround
+		{
+			for (i = 0; i < nbframes; i++, p++)
+			{
+				SOFTCLIP(p->sample[0]);
+				SOFTCLIP(p->sample[1]);
+				SOFTCLIP(p->sample[2]);
+				SOFTCLIP(p->sample[3]);
+			}
+		}
+		else if (nchannels == 2)  // 2.0 stereo
+		{
+			for (i = 0; i < nbframes; i++, p++)
+			{
+				SOFTCLIP(p->sample[0]);
+				SOFTCLIP(p->sample[1]);
+			}
+		}
+		else if (nchannels == 1)  // 1.0 mono
 		{
-			val = (snd_p[i]*snd_vol)>>8;
-			if (val > 0x7fff)
-				snd_out[i] = 0x7fff;
-			else if (val < (short)0x8000)
-				snd_out[i] = (short)0x8000;
-			else
-				snd_out[i] = val;
-
-			val = (snd_p[i+1]*snd_vol)>>8;
-			if (val > 0x7fff)
-				snd_out[i+1] = 0x7fff;
-			else if (val < (short)0x8000)
-				snd_out[i+1] = (short)0x8000;
-			else
-				snd_out[i+1] = val;
+			for (i = 0; i < nbframes; i++, p++)
+			{
+				SOFTCLIP(p->sample[0]);
+			}
 		}
+#undef SOFTCLIP
 	}
 }
 
-void S_TransferStereo16 (int endtime)
+static void S_ConvertPaintBuffer(portable_sampleframe_t *painted_ptr, void *rb_ptr, int nbframes, int width, int nchannels)
 {
-	int		lpos;
-	int		lpaintedtime;
-	DWORD	*pbuf;
-#ifdef _WIN32
-	int		reps;
-	DWORD	dwSize,dwSize2;
-	DWORD	*pbuf2;
-	HRESULT	hresult;
-#endif
-	
-	snd_vol = volume.value*256;
-
-	snd_p = (int *) paintbuffer;
-	lpaintedtime = paintedtime;
-
-#ifdef _WIN32
-	if (pDSBuf)
+	int i;
+	float val;
+	if (width == 4)  // 32bit float
 	{
-		reps = 0;
-
-		while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize, 
-									   &pbuf2, &dwSize2, 0)) != DS_OK)
+		float *snd_out = (float*)rb_ptr;
+		if (nchannels == 8)  // 7.1 surround
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				*snd_out++ = painted_ptr->sample[0];
+				*snd_out++ = painted_ptr->sample[1];
+				*snd_out++ = painted_ptr->sample[2];
+				*snd_out++ = painted_ptr->sample[3];
+				*snd_out++ = painted_ptr->sample[4];
+				*snd_out++ = painted_ptr->sample[5];
+				*snd_out++ = painted_ptr->sample[6];
+				*snd_out++ = painted_ptr->sample[7];
+			}
+		}
+		else if (nchannels == 6)  // 5.1 surround
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				*snd_out++ = painted_ptr->sample[0];
+				*snd_out++ = painted_ptr->sample[1];
+				*snd_out++ = painted_ptr->sample[2];
+				*snd_out++ = painted_ptr->sample[3];
+				*snd_out++ = painted_ptr->sample[4];
+				*snd_out++ = painted_ptr->sample[5];
+			}
+		}
+		else if (nchannels == 4)  // 4.0 surround
 		{
-			if (hresult != DSERR_BUFFERLOST)
+			for (i = 0; i < nbframes; i++, painted_ptr++)
 			{
-				Con_Printf ("S_TransferStereo16: DS::Lock Sound Buffer Failed\n");
-				S_Shutdown ();
-				S_Startup ();
-				return;
+				*snd_out++ = painted_ptr->sample[0];
+				*snd_out++ = painted_ptr->sample[1];
+				*snd_out++ = painted_ptr->sample[2];
+				*snd_out++ = painted_ptr->sample[3];
 			}
+		}
+		else if (nchannels == 2)  // 2.0 stereo
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				*snd_out++ = painted_ptr->sample[0];
+				*snd_out++ = painted_ptr->sample[1];
+			}
+		}
+		else if (nchannels == 1)  // 1.0 mono
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				*snd_out++ = painted_ptr->sample[0];
+			}
+		}
 
-			if (++reps > 10000)
+		// noise is really really annoying
+		if (cls.timedemo)
+			memset(rb_ptr, 0, nbframes * nchannels * width);
+	}
+	else if (width == 2)  // 16bit
+	{
+		short *snd_out = (short*)rb_ptr;
+		if (nchannels == 8)  // 7.1 surround
+		{
+			for (i = 0;i < nbframes;i++, painted_ptr++)
+			{
+				val = (int)(painted_ptr->sample[0] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[1] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[2] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[3] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[4] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[5] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[6] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[7] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+			}
+		}
+		else if (nchannels == 6)  // 5.1 surround
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				val = (int)(painted_ptr->sample[0] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[1] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[2] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[3] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[4] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[5] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+			}
+		}
+		else if (nchannels == 4)  // 4.0 surround
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				val = (int)(painted_ptr->sample[0] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[1] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[2] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[3] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+			}
+		}
+		else if (nchannels == 2)  // 2.0 stereo
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
 			{
-				Con_Printf ("S_TransferStereo16: DS: couldn't restore buffer\n");
-				S_Shutdown ();
-				S_Startup ();
-				return;
+				val = (int)(painted_ptr->sample[0] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
+				val = (int)(painted_ptr->sample[1] * 32768.0f);*snd_out++ = bound(-32768, val, 32767);
 			}
 		}
+		else if (nchannels == 1)  // 1.0 mono
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				val = (int)((painted_ptr->sample[0] + painted_ptr->sample[1]) * 16384.0f);*snd_out++ = bound(-32768, val, 32767);
+			}
+		}
+
+		// noise is really really annoying
+		if (cls.timedemo)
+			memset(rb_ptr, 0, nbframes * nchannels * width);
 	}
-	else
-#endif
+	else  // 8bit
 	{
-		pbuf = (DWORD *)shm->buffer;
+		unsigned char *snd_out = (unsigned char*)rb_ptr;
+		if (nchannels == 8)  // 7.1 surround
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				val = (int)(painted_ptr->sample[0] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[1] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[2] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[3] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[4] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[5] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[6] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[7] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+			}
+		}
+		else if (nchannels == 6)  // 5.1 surround
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				val = (int)(painted_ptr->sample[0] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[1] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[2] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[3] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[4] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[5] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+			}
+		}
+		else if (nchannels == 4)  // 4.0 surround
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				val = (int)(painted_ptr->sample[0] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[1] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[2] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[3] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+			}
+		}
+		else if (nchannels == 2)  // 2.0 stereo
+		{
+			for (i = 0; i < nbframes; i++, painted_ptr++)
+			{
+				val = (int)(painted_ptr->sample[0] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+				val = (int)(painted_ptr->sample[1] * 128.0f) + 128; *snd_out++ = bound(0, val, 255);
+			}
+		}
+		else if (nchannels == 1)  // 1.0 mono
+		{
+			for (i = 0;i < nbframes;i++, painted_ptr++)
+			{
+				val = (int)((painted_ptr->sample[0] + painted_ptr->sample[1]) * 64.0f) + 128; *snd_out++ = bound(0, val, 255);
+			}
+		}
+
+		// noise is really really annoying
+		if (cls.timedemo)
+			memset(rb_ptr, 128, nbframes * nchannels);
 	}
+}
 
-	while (lpaintedtime < endtime)
-	{
-	// handle recirculating buffer issues
-		lpos = lpaintedtime & ((shm->samples>>1)-1);
 
-		snd_out = (short *) pbuf + (lpos<<1);
 
-		snd_linear_count = (shm->samples>>1) - lpos;
-		if (lpaintedtime + snd_linear_count > endtime)
-			snd_linear_count = endtime - lpaintedtime;
+/*
+===============================================================================
 
-		snd_linear_count <<= 1;
+UNDERWATER EFFECT
 
-	// write a linear blast of samples
-		Snd_WriteLinearBlastStereo16 ();
+Muffles the intensity of sounds when the player is underwater
 
-		snd_p += snd_linear_count;
-		lpaintedtime += (snd_linear_count>>1);
-	}
+===============================================================================
+*/
 
-#ifdef _WIN32
-	if (pDSBuf)
-		pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);
-#endif
+static struct
+{
+	float intensity;
+	float alpha;
+	float accum[SND_LISTENERS];
 }
+underwater = {0.f, 1.f, {0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f}};
 
-void S_TransferPaintBuffer(int endtime)
+void S_SetUnderwaterIntensity(void)
 {
-	int 	out_idx;
-	int 	count;
-	int 	out_mask;
-	int 	*p;
-	int 	step;
-	int		val;
-	int		snd_vol;
-	DWORD	*pbuf;
-#ifdef _WIN32
-	int		reps;
-	DWORD	dwSize,dwSize2;
-	DWORD	*pbuf2;
-	HRESULT	hresult;
-#endif
+	float target = cl.view_underwater ? bound(0.f, snd_waterfx.value, 2.f) : 0.f;
 
-	if (shm->samplebits == 16 && shm->channels == 2)
+	if (underwater.intensity < target)
 	{
-		S_TransferStereo16 (endtime);
-		return;
+		underwater.intensity += cl.realframetime * 4.f;
+		underwater.intensity = min(underwater.intensity, target);
 	}
-	
-	p = (int *) paintbuffer;
-	count = (endtime - paintedtime) * shm->channels;
-	out_mask = shm->samples - 1; 
-	out_idx = paintedtime * shm->channels & out_mask;
-	step = 3 - shm->channels;
-	snd_vol = volume.value*256;
-
-#ifdef _WIN32
-	if (pDSBuf)
+	else if (underwater.intensity > target)
 	{
-		reps = 0;
+		underwater.intensity -= cl.realframetime * 4.f;
+		underwater.intensity = max(underwater.intensity, target);
+	}
 
-		while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize, 
-									   &pbuf2,&dwSize2, 0)) != DS_OK)
-		{
-			if (hresult != DSERR_BUFFERLOST)
-			{
-				Con_Printf ("S_TransferPaintBuffer: DS::Lock Sound Buffer Failed\n");
-				S_Shutdown ();
-				S_Startup ();
-				return;
-			}
+	underwater.alpha = underwater.intensity ? exp(-underwater.intensity * log(12.f)) : 1.f;
+}
 
-			if (++reps > 10000)
-			{
-				Con_Printf ("S_TransferPaintBuffer: DS: couldn't restore buffer\n");
-				S_Shutdown ();
-				S_Startup ();
-				return;
-			}
-		}
-	}
-	else
-#endif
-	{
-		pbuf = (DWORD *)shm->buffer;
-	}
+static void S_UnderwaterFilter(int endtime)
+{
+	int i;
+	int sl;
 
-	if (shm->samplebits == 16)
+	if (!underwater.intensity)
 	{
-		short *out = (short *) pbuf;
-		while (count--)
-		{
-			val = (*p * snd_vol) >> 8;
-			p+= step;
-			if (val > 0x7fff)
-				val = 0x7fff;
-			else if (val < (short)0x8000)
-				val = (short)0x8000;
-			out[out_idx] = val;
-			out_idx = (out_idx + 1) & out_mask;
-		}
+		if (endtime > 0)
+			for (sl = 0; sl < SND_LISTENERS; sl++)
+				underwater.accum[sl] = paintbuffer[endtime-1].sample[sl];
+		return;
 	}
-	else if (shm->samplebits == 8)
-	{
-		unsigned char *out = (unsigned char *) pbuf;
-		while (count--)
+
+	for (i = 0; i < endtime; i++)
+		for (sl = 0; sl < SND_LISTENERS; sl++)
 		{
-			val = (*p * snd_vol) >> 8;
-			p+= step;
-			if (val > 0x7fff)
-				val = 0x7fff;
-			else if (val < (short)0x8000)
-				val = (short)0x8000;
-			out[out_idx] = (val>>8) + 128;
-			out_idx = (out_idx + 1) & out_mask;
+			underwater.accum[sl] += underwater.alpha * (paintbuffer[i].sample[sl] - underwater.accum[sl]);
+			paintbuffer[i].sample[sl] = underwater.accum[sl];
 		}
-	}
-
-#ifdef _WIN32
-	if (pDSBuf) {
-		DWORD dwNewpos, dwWrite;
-		int il = paintedtime;
-		int ir = endtime - paintedtime;
-		
-		ir += il;
-
-		pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);
-
-		pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &dwNewpos, &dwWrite);
-
-//		if ((dwNewpos >= il) && (dwNewpos <= ir))
-//			Con_Printf("%d-%d p %d c\n", il, ir, dwNewpos);
-	}
-#endif
 }
 
 
+
 /*
 ===============================================================================
 
@@ -278,162 +378,280 @@ CHANNEL MIXING
 ===============================================================================
 */
 
-void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int endtime);
-void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int endtime);
-
-void S_PaintChannels(int endtime)
+void S_MixToBuffer(void *stream, unsigned int bufferframes)
 {
-	int 	i;
-	int 	end;
+	int channelindex;
 	channel_t *ch;
-	sfxcache_t	*sc;
-	int		ltime, count;
-
-	while (paintedtime < endtime)
+	int totalmixframes;
+	unsigned char *outbytes = (unsigned char *) stream;
+	sfx_t *sfx;
+	portable_sampleframe_t *paint;
+	int wantframes;
+	int i;
+	int count;
+	int fetched;
+	int fetch;
+	int istartframe;
+	int iendframe;
+	int ilengthframes;
+	int totallength;
+	int loopstart;
+	int indexfrac;
+	int indexfracstep;
+#define S_FETCHBUFFERSIZE 4096
+	float fetchsampleframes[S_FETCHBUFFERSIZE*2];
+	const float *fetchsampleframe;
+	float vol[SND_LISTENERS];
+	float lerp[2];
+	float sample[3];
+	double posd;
+	double speedd;
+	float maxvol;
+	qbool looping;
+	qbool silent;
+
+	// mix as many times as needed to fill the requested buffer
+	while (bufferframes)
 	{
-	// if paintbuffer is smaller than DMA buffer
-		end = endtime;
-		if (endtime - paintedtime > PAINTBUFFER_SIZE)
-			end = paintedtime + PAINTBUFFER_SIZE;
+		// limit to the size of the paint buffer
+		totalmixframes = min(bufferframes, PAINTBUFFER_SIZE);
 
-	// clear the paint buffer
-		memset(paintbuffer, 0, (end - paintedtime) * sizeof(portable_samplepair_t));
+		// clear the paint buffer
+		memset(paintbuffer, 0, totalmixframes * sizeof(paintbuffer[0]));
 
-	// paint in the channels.
-		ch = channels;
-		for (i=0; i<total_channels ; i++, ch++)
+		// paint in the channels.
+		// channels with zero volumes still advance in time but don't paint.
+		ch = channels; // cppcheck complains here but it is wrong, channels is a channel_t[MAX_CHANNELS] and not an int
+		for (channelindex = 0;channelindex < (int)total_channels;channelindex++, ch++)
 		{
-			if (!ch->sfx)
+			sfx = ch->sfx;
+			if (sfx == NULL)
 				continue;
-			if (!ch->leftvol && !ch->rightvol)
+			if (!S_LoadSound (sfx, true))
 				continue;
-			sc = S_LoadSound (ch->sfx);
-			if (!sc)
+			if (ch->flags & CHANNELFLAG_PAUSED)
 				continue;
+			if (!sfx->total_length)
+				continue;
+
+			// copy the channel information to the stack for reference, otherwise the
+			// values might change during a mix if the spatializer is updating them
+			// (note: this still may get some old and some new values!)
+			posd = ch->position;
+			speedd = ch->mixspeed * sfx->format.speed / snd_renderbuffer->format.speed;
+			for (i = 0;i < SND_LISTENERS;i++)
+				vol[i] = ch->volume[i];
+
+			// check total volume level, because we can skip some code on silent sounds but other code must still run (position updates mainly)
+			maxvol = 0;
+			for (i = 0;i < SND_LISTENERS;i++)
+				if(vol[i] > maxvol)
+					maxvol = vol[i];
+			switch(snd_renderbuffer->format.width)
+			{
+				case 1: // 8bpp
+					silent = maxvol < (1.0f / (256.0f));
+					// so silent it has zero effect
+					break;
+				case 2: // 16bpp
+					silent = maxvol < (1.0f / (65536.0f));
+					// so silent it has zero effect
+					break;
+				default: // floating point
+					silent = maxvol < 1.0e-13f;
+					// 130 dB is difference between hearing
+					// threshold and a jackhammer from
+					// working distance.
+					// therefore, anyone who turns up
+					// volume so much they notice this
+					// cutoff, likely already has their
+					// ear-drums blown out anyway.
+					break;
+			}
 
-			ltime = paintedtime;
+			// when doing prologic mixing, some channels invert one side
+			if (ch->prologic_invert == -1)
+				vol[1] *= -1.0f;
 
-			while (ltime < end)
-			{	// paint up to end
-				if (ch->end < end)
-					count = ch->end - ltime;
-				else
-					count = end - ltime;
+			// get some sfx info in a consistent form
+			totallength = sfx->total_length;
+			loopstart = (int)sfx->loopstart < totallength ? (int)sfx->loopstart : ((ch->flags & CHANNELFLAG_FORCELOOP) ? 0 : totallength);
+			looping = loopstart < totallength;
 
-				if (count > 0)
-				{	
-					if (sc->width == 1)
-						SND_PaintChannelFrom8(ch, sc, count);
-					else
-						SND_PaintChannelFrom16(ch, sc, count);
-	
-					ltime += count;
+			// do the actual paint now (may skip work if silent)
+			paint = paintbuffer;
+			istartframe = 0;
+			for (wantframes = totalmixframes;wantframes > 0;posd += count * speedd, wantframes -= count)
+			{
+				// check if this is a delayed sound
+				if (posd < 0)
+				{
+					// for a delayed sound we have to eat into the delay first
+					count = (int)floor(-posd / speedd) + 1;
+					count = bound(1, count, wantframes);
+					// let the for loop iterator apply the skip
+					continue;
+				}
+
+				// compute a fetch size that won't overflow our buffer
+				count = wantframes;
+				for (;;)
+				{
+					istartframe = (int)floor(posd);
+					iendframe = (int)floor(posd + (count-1) * speedd);
+					ilengthframes = count > 1 ? (iendframe - istartframe + 2) : 2;
+					if (ilengthframes <= S_FETCHBUFFERSIZE)
+						break;
+					// reduce count by 25% and try again
+					count -= count >> 2;
 				}
 
-			// if at end of loop, restart
-				if (ltime >= ch->end)
+				// zero whole fetch buffer for safety
+				// (floating point noise from uninitialized memory = HORRIBLE)
+				// otherwise we would only need to clear the excess
+				if (!silent)
+					memset(fetchsampleframes, 0, ilengthframes*sfx->format.channels*sizeof(fetchsampleframes[0]));
+
+				// if looping, do multiple fetches
+				fetched = 0;
+				for (;;)
 				{
-					if (sc->loopstart >= 0)
+					fetch = min(ilengthframes - fetched, totallength - istartframe);
+					if (fetch > 0)
 					{
-						ch->pos = sc->loopstart;
-						ch->end = ltime + sc->length - ch->pos;
+						if (!silent)
+							sfx->fetcher->getsamplesfloat(ch, sfx, istartframe, fetch, fetchsampleframes + fetched*sfx->format.channels);
+						istartframe += fetch;
+						fetched += fetch;
 					}
-					else				
-					{	// channel just stopped
-						ch->sfx = NULL;
+					if (istartframe == totallength && looping && fetched < ilengthframes)
+					{
+						// loop and fetch some more
+						posd += loopstart - totallength;
+						istartframe = loopstart;
+					}
+					else
+					{
 						break;
 					}
 				}
+
+				// set up our fixedpoint resampling variables (float to int conversions are expensive so do not do one per sampleframe)
+				fetchsampleframe = fetchsampleframes;
+				indexfrac = (int)floor((posd - floor(posd)) * 65536.0);
+				indexfracstep = (int)floor(speedd * 65536.0);
+				if (!silent)
+				{
+					if (sfx->format.channels == 2)
+					{
+						// music is stereo
+#if SND_LISTENERS != 8
+#error the following code only supports up to 8 channels, update it
+#endif
+						if (snd_speakerlayout.channels > 2)
+						{
+							// surround mixing
+							for (i = 0;i < count;i++, paint++)
+							{
+								lerp[1] = indexfrac * (1.0f / 65536.0f);
+								lerp[0] = 1.0f - lerp[1];
+								sample[0] = fetchsampleframe[0] * lerp[0] + fetchsampleframe[2] * lerp[1];
+								sample[1] = fetchsampleframe[1] * lerp[0] + fetchsampleframe[3] * lerp[1];
+								sample[2] = (sample[0] + sample[1]) * 0.5f;
+								paint->sample[0] += sample[0] * vol[0];
+								paint->sample[1] += sample[1] * vol[1];
+								paint->sample[2] += sample[0] * vol[2];
+								paint->sample[3] += sample[1] * vol[3];
+								paint->sample[4] += sample[2] * vol[4];
+								paint->sample[5] += sample[2] * vol[5];
+								paint->sample[6] += sample[0] * vol[6];
+								paint->sample[7] += sample[1] * vol[7];
+								indexfrac += indexfracstep;
+								fetchsampleframe += 2 * (indexfrac >> 16);
+								indexfrac &= 0xFFFF;
+							}
+						}
+						else
+						{
+							// stereo mixing
+							for (i = 0;i < count;i++, paint++)
+							{
+								lerp[1] = indexfrac * (1.0f / 65536.0f);
+								lerp[0] = 1.0f - lerp[1];
+								sample[0] = fetchsampleframe[0] * lerp[0] + fetchsampleframe[2] * lerp[1];
+								sample[1] = fetchsampleframe[1] * lerp[0] + fetchsampleframe[3] * lerp[1];
+								paint->sample[0] += sample[0] * vol[0];
+								paint->sample[1] += sample[1] * vol[1];
+								indexfrac += indexfracstep;
+								fetchsampleframe += 2 * (indexfrac >> 16);
+								indexfrac &= 0xFFFF;
+							}
+						}
+					}
+					else if (sfx->format.channels == 1)
+					{
+						// most sounds are mono
+#if SND_LISTENERS != 8
+#error the following code only supports up to 8 channels, update it
+#endif
+						if (snd_speakerlayout.channels > 2)
+						{
+							// surround mixing
+							for (i = 0;i < count;i++, paint++)
+							{
+								lerp[1] = indexfrac * (1.0f / 65536.0f);
+								lerp[0] = 1.0f - lerp[1];
+								sample[0] = fetchsampleframe[0] * lerp[0] + fetchsampleframe[1] * lerp[1];
+								paint->sample[0] += sample[0] * vol[0];
+								paint->sample[1] += sample[0] * vol[1];
+								paint->sample[2] += sample[0] * vol[2];
+								paint->sample[3] += sample[0] * vol[3];
+								paint->sample[4] += sample[0] * vol[4];
+								paint->sample[5] += sample[0] * vol[5];
+								paint->sample[6] += sample[0] * vol[6];
+								paint->sample[7] += sample[0] * vol[7];
+								indexfrac += indexfracstep;
+								fetchsampleframe += (indexfrac >> 16);
+								indexfrac &= 0xFFFF;
+							}
+						}
+						else
+						{
+							// stereo mixing
+							for (i = 0;i < count;i++, paint++)
+							{
+								lerp[1] = indexfrac * (1.0f / 65536.0f);
+								lerp[0] = 1.0f - lerp[1];
+								sample[0] = fetchsampleframe[0] * lerp[0] + fetchsampleframe[1] * lerp[1];
+								paint->sample[0] += sample[0] * vol[0];
+								paint->sample[1] += sample[0] * vol[1];
+								indexfrac += indexfracstep;
+								fetchsampleframe += (indexfrac >> 16);
+								indexfrac &= 0xFFFF;
+							}
+						}
+					}
+				}
 			}
-															  
+			ch->position = posd;
+			if (!looping && istartframe == totallength)
+				S_StopChannel(ch - channels, false, false);
 		}
 
-	// transfer out according to DMA format
-		S_TransferPaintBuffer(end);
-		paintedtime = end;
-	}
-}
+		S_SoftClipPaintBuffer(paintbuffer, totalmixframes, snd_renderbuffer->format.width, snd_renderbuffer->format.channels);
 
-void SND_InitScaletable (void)
-{
-	int		i, j;
-	
-	for (i=0 ; i<32 ; i++)
-		for (j=0 ; j<256 ; j++)
-			snd_scaletable[i][j] = ((signed char)j) * i * 8;
-}
+		S_UnderwaterFilter(totalmixframes);
 
 
-void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int count)
-{
-//	int 	data;
-	int		*lscale, *rscale;
-	unsigned char *sfx;
-	int		i;
-
-	if (ch->leftvol > 255)
-		ch->leftvol = 255;
-	if (ch->rightvol > 255)
-		ch->rightvol = 255;
-		
-	lscale = snd_scaletable[ch->leftvol >> 3];
-	rscale = snd_scaletable[ch->rightvol >> 3];
-	if (sc->stereo) // LordHavoc: stereo sound support, and optimizations
-	{
-		sfx = (unsigned char *)sc->data + ch->pos * 2;
-
-		for (i=0 ; i<count ; i++)
-		{
-			paintbuffer[i].left += lscale[*sfx++];
-			paintbuffer[i].right += rscale[*sfx++];
-		}
-		
-	}
-	else
-	{
-		sfx = (unsigned char *)sc->data + ch->pos;
-
-		for (i=0 ; i<count ; i++)
-		{
-			paintbuffer[i].left += lscale[*sfx];
-			paintbuffer[i].right += rscale[*sfx++];
-		}
-		
-	}
-	ch->pos += count;
-}
-
-void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int count)
-{
-//	int data;
-//	int left, right;
-	int leftvol, rightvol;
-	signed short *sfx;
-	int	i;
-
-	leftvol = ch->leftvol;
-	rightvol = ch->rightvol;
-	if (sc->stereo) // LordHavoc: stereo sound support, and optimizations
-	{
-		sfx = (signed short *)sc->data + ch->pos * 2;
+#ifdef CONFIG_VIDEO_CAPTURE
+		if (!snd_usethreadedmixing)
+			S_CaptureAVISound(paintbuffer, totalmixframes);
+#endif
 
-		for (i=0 ; i<count ; i++)
-		{
-			paintbuffer[i].left += (short) ((int) (*sfx++ * leftvol) >> 8);
-			paintbuffer[i].right += (short) ((int) (*sfx++ * rightvol) >> 8);
-		}
-	}
-	else
-	{
-		sfx = (signed short *)sc->data + ch->pos;
+		S_ConvertPaintBuffer(paintbuffer, outbytes, totalmixframes, snd_renderbuffer->format.width, snd_renderbuffer->format.channels);
 
-		for (i=0 ; i<count ; i++)
-		{
-			paintbuffer[i].left += (short) ((int) (*sfx * leftvol) >> 8);
-			paintbuffer[i].right += (short) ((int) (*sfx++ * rightvol) >> 8);
-		}
+		// advance the output pointer
+		outbytes += totalmixframes * snd_renderbuffer->format.width * snd_renderbuffer->format.channels;
+		bufferframes -= totalmixframes;
 	}
-
-	ch->pos += count;
 }
-