patch-2.4.0-test9 linux/drivers/sound/softoss_rs.c

• Lines: 128
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.0-test8/linux/drivers/sound/softoss_rs.c
• Orig date: Mon Feb 28 07:18:20 2000

diff -u --recursive --new-file v2.4.0-test8/linux/drivers/sound/softoss_rs.c linux/drivers/sound/softoss_rs.c
@@ -1,127 +0,0 @@
-
-/*
- * sound/softoss_rs.c
- *
- * Software based MIDI synthsesizer driver, the actual mixing loop.
- * Keep the loop as simple as possible to make it easier to rewrite this 
- * routine in assembly.
- *
- *
- * Copyright (C) by Hannu Savolainen 1993-1997
- *
- * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
- * Version 2 (June 1991). See the "COPYING" file distributed with this software
- * for more info.
- */
-#include "sound_config.h"
-#include "softoss.h"
-
-void softsynth_resample_loop(short *buf, int loops)
-{
-	int iloop, voice;
-	volatile voice_info *v;
-
-#ifdef OSS_BIG_ENDIAN
-	unsigned char  *cbuf = (unsigned char *) buf;
-
-#endif
-
-	for (iloop = 0; iloop < loops; iloop++)
-	{			/* Mix one sample */
-		int accum, left = 0, right = 0;
-		int ix, position;
-
-		for (voice = 0; voice < devc->maxvoice; voice++)
-		{
-			if (voice_active[voice])
-			{	/* Compute voice */
-				v = &softoss_voices[voice];
-#ifdef SOFTOSS_TEST
-				ix = iloop << 3;
-				position = v->ptr;
-#else
-				ix = (position = v->ptr) >> 9;
-#endif
-				/* Interpolation (resolution of 512 steps) */
-				{
-					int fract = v->ptr & 0x1ff;	/* 9 bits */
-
-					/* This method works with less arithmetic operations */
-					register int v1 = v->wave[ix];
-					accum = v1 + ((((v->wave[ix + 1] - v1)) * (fract)) >> 9);
-				}
-
-				left += (accum * v->leftvol);
-				right += (accum * v->rightvol);
-
-				/* Update sample pointer */
-				position += v->step;
-				if (position <= v->endloop)
-					v->ptr = position;
-				else if (v->mode & WAVE_LOOPING)
-				{
-					if (v->mode & WAVE_BIDIR_LOOP)
-					{							v->mode ^= WAVE_LOOP_BACK;	/* Turn around */
-						v->step *= -1;
-					}
-					else
-					{
-						position -= v->looplen;
-						v->ptr = position;
-					}
-				}
-				/*  else leave the voice looping the current sample */
-
-				if (v->mode & WAVE_LOOP_BACK && position < v->startloop)
-				{
-					if (v->mode & WAVE_BIDIR_LOOP)
-					{							v->mode ^= WAVE_LOOP_BACK;	/* Turn around */
-						v->step *= -1;
-					}
-					else
-					{
-						position += v->looplen;
-						v->ptr = position;
-					}
-				}
-			}	/* Compute voice */
-		}
-#if 1				/* Delay */
-		left += left_delay[delayp];
-		right += right_delay[delayp];
-
-		left_delay[delayp] = right >> 2;
-		right_delay[delayp] = left >> 2;
-		delayp = (delayp + 1) % devc->delay_size;
-#endif
-
-#define AFTERSCALE devc->afterscale;
-
-		left >>= AFTERSCALE;
-		right >>= AFTERSCALE;
-
-		if (left > 32767)
-			left = 32767;
-		if (left < -32768)
-			left = -32768;
-		if (right > 32767)
-			right = 32767;
-		if (right < -32768)
-			right = -32768;
-
-#ifdef OSS_BIG_ENDIAN
-		*cbuf++ = left & 0xff;
-		*cbuf++ = (left >> 8) & 0xff;
-		*cbuf++ = right & 0xff;
-		*cbuf++ = (right >> 8) & 0xff;
-#else
-		*buf++ = left;
-		*buf++ = right;
-#endif
-		if (devc->control_counter++ >= devc->control_rate)
-		{
-			devc->control_counter = 0;
-			softsyn_control_loop();
-		}
-	}			/* Mix one sample */
-}