virtch.c
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:26k
源码类别:
Windows CE
开发平台:
C/C++
- /* MikMod sound library
- (c) 1998, 1999, 2000, 2001, 2002 Miodrag Vallat and others - see file
- AUTHORS for complete list.
- This library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 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. See the
- GNU Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA.
- */
- /*==============================================================================
- $Id: virtch.c,v 1.2 2004/02/13 13:31:54 raph Exp $
- Sample mixing routines, using a 32 bits mixing buffer.
- ==============================================================================*/
- /*
- Optional features include:
- (a) 4-step reverb (for 16 bit output only)
- (b) Interpolation of sample data during mixing
- (c) Dolby Surround Sound
- */
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
- #include <stddef.h>
- #ifdef HAVE_MEMORY_H
- #include <memory.h>
- #endif
- #include <string.h>
- #include "mikmod_internals.h"
- /*
- Constant definitions
- ====================
- BITSHIFT
- Controls the maximum volume of the sound output. All data is shifted
- right by BITSHIFT after being mixed. Higher values result in quieter
- sound and less chance of distortion.
- REVERBERATION
- Controls the duration of the reverb. Larger values represent a shorter
- reverb loop. Smaller values extend the reverb but can result in more of
- an echo-ish sound.
- */
- #define BITSHIFT 9
- #define REVERBERATION 110000L
- #define FRACBITS 11
- #define FRACMASK ((1L<<FRACBITS)-1L)
- #define TICKLSIZE 8192
- #define TICKWSIZE (TICKLSIZE<<1)
- #define TICKBSIZE (TICKWSIZE<<1)
- #define CLICK_SHIFT 6
- #define CLICK_BUFFER (1L<<CLICK_SHIFT)
- #ifndef MIN
- #define MIN(a,b) (((a)<(b)) ? (a) : (b))
- #endif
- typedef struct VINFO {
- UBYTE kick; /* =1 -> sample has to be restarted */
- UBYTE active; /* =1 -> sample is playing */
- UWORD flags; /* 16/8 bits looping/one-shot */
- SWORD handle; /* identifies the sample */
- ULONG start; /* start index */
- ULONG size; /* samplesize */
- ULONG reppos; /* loop start */
- ULONG repend; /* loop end */
- ULONG frq; /* current frequency */
- int vol; /* current volume */
- int pan; /* current panning position */
- int rampvol;
- int lvolsel,rvolsel; /* Volume factor in range 0-255 */
- int oldlvol,oldrvol;
- SLONGLONG current; /* current index in the sample */
- SLONGLONG increment; /* increment value */
- } VINFO;
- static SWORD **Samples;
- static VINFO *vinf=NULL,*vnf;
- static long tickleft,samplesthatfit,vc_memory=0;
- static int vc_softchn;
- static SLONGLONG idxsize,idxlpos,idxlend;
- static SLONG *vc_tickbuf=NULL;
- static UWORD vc_mode;
- /* Reverb control variables */
- static int RVc1, RVc2, RVc3, RVc4, RVc5, RVc6, RVc7, RVc8;
- static ULONG RVRindex;
- /* For Mono or Left Channel */
- static SLONG *RVbufL1=NULL,*RVbufL2=NULL,*RVbufL3=NULL,*RVbufL4=NULL,
- *RVbufL5=NULL,*RVbufL6=NULL,*RVbufL7=NULL,*RVbufL8=NULL;
- /* For Stereo only (Right Channel) */
- static SLONG *RVbufR1=NULL,*RVbufR2=NULL,*RVbufR3=NULL,*RVbufR4=NULL,
- *RVbufR5=NULL,*RVbufR6=NULL,*RVbufR7=NULL,*RVbufR8=NULL;
- #ifdef NATIVE_64BIT_INT
- #define NATIVE SLONGLONG
- #else
- #define NATIVE SLONG
- #endif
- /*========== 32 bit sample mixers - only for 32 bit platforms */
- #ifndef NATIVE_64BIT_INT
- static SLONG Mix32MonoNormal(SWORD* srce,SLONG* dest,SLONG index,SLONG increment,SLONG todo)
- {
- SWORD sample;
- SLONG lvolsel = vnf->lvolsel;
- while(todo--) {
- sample = srce[index >> FRACBITS];
- index += increment;
- *dest++ += lvolsel * sample;
- }
- return index;
- }
- static SLONG Mix32StereoNormal(SWORD* srce,SLONG* dest,SLONG index,SLONG increment,SLONG todo)
- {
- SWORD sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rvolsel = vnf->rvolsel;
- while(todo--) {
- sample=srce[index >> FRACBITS];
- index += increment;
- *dest++ += lvolsel * sample;
- *dest++ += rvolsel * sample;
- }
- return index;
- }
- static SLONG Mix32SurroundNormal(SWORD* srce,SLONG* dest,SLONG index,SLONG increment,SLONG todo)
- {
- SWORD sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rvolsel = vnf->rvolsel;
- if (lvolsel>=rvolsel) {
- while(todo--) {
- sample = srce[index >> FRACBITS];
- index += increment;
- *dest++ += lvolsel*sample;
- *dest++ -= lvolsel*sample;
- }
- } else {
- while(todo--) {
- sample = srce[index >> FRACBITS];
- index += increment;
- *dest++ -= rvolsel*sample;
- *dest++ += rvolsel*sample;
- }
- }
- return index;
- }
- static SLONG Mix32MonoInterp(SWORD* srce,SLONG* dest,SLONG index,SLONG increment,SLONG todo)
- {
- SLONG sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rampvol = vnf->rampvol;
- if (rampvol) {
- SLONG oldlvol = vnf->oldlvol - lvolsel;
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += ((lvolsel << CLICK_SHIFT) + oldlvol * rampvol)
- * sample >> CLICK_SHIFT;
- if (!--rampvol)
- break;
- }
- vnf->rampvol = rampvol;
- if (todo < 0)
- return index;
- }
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += lvolsel * sample;
- }
- return index;
- }
- static SLONG Mix32StereoInterp(SWORD* srce,SLONG* dest,SLONG index,SLONG increment,SLONG todo)
- {
- SLONG sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rvolsel = vnf->rvolsel;
- SLONG rampvol = vnf->rampvol;
- if (rampvol) {
- SLONG oldlvol = vnf->oldlvol - lvolsel;
- SLONG oldrvol = vnf->oldrvol - rvolsel;
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += ((lvolsel << CLICK_SHIFT) + oldlvol * rampvol)
- * sample >> CLICK_SHIFT;
- *dest++ += ((rvolsel << CLICK_SHIFT) + oldrvol * rampvol)
- * sample >> CLICK_SHIFT;
- if (!--rampvol)
- break;
- }
- vnf->rampvol = rampvol;
- if (todo < 0)
- return index;
- }
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += lvolsel * sample;
- *dest++ += rvolsel * sample;
- }
- return index;
- }
- static SLONG Mix32SurroundInterp(SWORD* srce,SLONG* dest,SLONG index,SLONG increment,SLONG todo)
- {
- SLONG sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rvolsel = vnf->rvolsel;
- SLONG rampvol = vnf->rampvol;
- SLONG oldvol, vol;
- if (lvolsel >= rvolsel) {
- vol = lvolsel;
- oldvol = vnf->oldlvol;
- } else {
- vol = rvolsel;
- oldvol = vnf->oldrvol;
- }
- if (rampvol) {
- oldvol -= vol;
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- sample=((vol << CLICK_SHIFT) + oldvol * rampvol)
- * sample >> CLICK_SHIFT;
- *dest++ += sample;
- *dest++ -= sample;
- if (!--rampvol)
- break;
- }
- vnf->rampvol = rampvol;
- if (todo < 0)
- return index;
- }
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += vol*sample;
- *dest++ -= vol*sample;
- }
- return index;
- }
- #endif
- /*========== 64 bit sample mixers - all platforms */
- static SLONGLONG MixMonoNormal(SWORD* srce,SLONG* dest,SLONGLONG index,SLONGLONG increment,SLONG todo)
- {
- SWORD sample;
- SLONG lvolsel = vnf->lvolsel;
- while(todo--) {
- sample = srce[index >> FRACBITS];
- index += increment;
- *dest++ += lvolsel * sample;
- }
- return index;
- }
- static SLONGLONG MixStereoNormal(SWORD* srce,SLONG* dest,SLONGLONG index,SLONGLONG increment,SLONG todo)
- {
- SWORD sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rvolsel = vnf->rvolsel;
- while(todo--) {
- sample=srce[index >> FRACBITS];
- index += increment;
- *dest++ += lvolsel * sample;
- *dest++ += rvolsel * sample;
- }
- return index;
- }
- static SLONGLONG MixSurroundNormal(SWORD* srce,SLONG* dest,SLONGLONG index,SLONGLONG increment,SLONG todo)
- {
- SWORD sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rvolsel = vnf->rvolsel;
- if(vnf->lvolsel>=vnf->rvolsel) {
- while(todo--) {
- sample = srce[index >> FRACBITS];
- index += increment;
- *dest++ += lvolsel*sample;
- *dest++ -= lvolsel*sample;
- }
- } else {
- while(todo--) {
- sample = srce[index >> FRACBITS];
- index += increment;
- *dest++ -= rvolsel*sample;
- *dest++ += rvolsel*sample;
- }
- }
- return index;
- }
- static SLONGLONG MixMonoInterp(SWORD* srce,SLONG* dest,SLONGLONG index,SLONGLONG increment,SLONG todo)
- {
- SLONG sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rampvol = vnf->rampvol;
- if (rampvol) {
- SLONG oldlvol = vnf->oldlvol - lvolsel;
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += ((lvolsel << CLICK_SHIFT) + oldlvol * rampvol)
- * sample >> CLICK_SHIFT;
- if (!--rampvol)
- break;
- }
- vnf->rampvol = rampvol;
- if (todo < 0)
- return index;
- }
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += lvolsel * sample;
- }
- return index;
- }
- static SLONGLONG MixStereoInterp(SWORD* srce,SLONG* dest,SLONGLONG index,SLONGLONG increment,SLONG todo)
- {
- SLONG sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rvolsel = vnf->rvolsel;
- SLONG rampvol = vnf->rampvol;
- if (rampvol) {
- SLONG oldlvol = vnf->oldlvol - lvolsel;
- SLONG oldrvol = vnf->oldrvol - rvolsel;
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ +=((lvolsel << CLICK_SHIFT) + oldlvol * rampvol)
- * sample >> CLICK_SHIFT;
- *dest++ +=((rvolsel << CLICK_SHIFT) + oldrvol * rampvol)
- * sample >> CLICK_SHIFT;
- if (!--rampvol)
- break;
- }
- vnf->rampvol = rampvol;
- if (todo < 0)
- return index;
- }
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += lvolsel * sample;
- *dest++ += rvolsel * sample;
- }
- return index;
- }
- static SLONGLONG MixSurroundInterp(SWORD* srce,SLONG* dest,SLONGLONG index,SLONGLONG increment,SLONG todo)
- {
- SLONG sample;
- SLONG lvolsel = vnf->lvolsel;
- SLONG rvolsel = vnf->rvolsel;
- SLONG rampvol = vnf->rampvol;
- SLONG oldvol, vol;
- if (lvolsel >= rvolsel) {
- vol = lvolsel;
- oldvol = vnf->oldlvol;
- } else {
- vol = rvolsel;
- oldvol = vnf->oldrvol;
- }
- if (rampvol) {
- oldvol -= vol;
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- sample=((vol << CLICK_SHIFT) + oldvol * rampvol)
- * sample >> CLICK_SHIFT;
- *dest++ += sample;
- *dest++ -= sample;
- if (!--rampvol)
- break;
- }
- vnf->rampvol = rampvol;
- if (todo < 0)
- return index;
- }
- while(todo--) {
- sample=(SLONG)srce[index>>FRACBITS]+
- ((SLONG)(srce[(index>>FRACBITS)+1]-srce[index>>FRACBITS])
- *(index&FRACMASK)>>FRACBITS);
- index += increment;
- *dest++ += vol*sample;
- *dest++ -= vol*sample;
- }
- return index;
- }
- static void (*MixReverb)(SLONG* srce,NATIVE count);
- /* Reverb macros */
- #define COMPUTE_LOC(n) loc##n = RVRindex % RVc##n
- #define COMPUTE_LECHO(n) RVbufL##n [loc##n ]=speedup+((ReverbPct*RVbufL##n [loc##n ])>>7)
- #define COMPUTE_RECHO(n) RVbufR##n [loc##n ]=speedup+((ReverbPct*RVbufR##n [loc##n ])>>7)
- static void MixReverb_Normal(SLONG* srce,NATIVE count)
- {
- unsigned int speedup;
- int ReverbPct;
- unsigned int loc1,loc2,loc3,loc4;
- unsigned int loc5,loc6,loc7,loc8;
- ReverbPct=58+(md_reverb<<2);
- COMPUTE_LOC(1); COMPUTE_LOC(2); COMPUTE_LOC(3); COMPUTE_LOC(4);
- COMPUTE_LOC(5); COMPUTE_LOC(6); COMPUTE_LOC(7); COMPUTE_LOC(8);
- while(count--) {
- /* Compute the left channel echo buffers */
- speedup = *srce >> 3;
- COMPUTE_LECHO(1); COMPUTE_LECHO(2); COMPUTE_LECHO(3); COMPUTE_LECHO(4);
- COMPUTE_LECHO(5); COMPUTE_LECHO(6); COMPUTE_LECHO(7); COMPUTE_LECHO(8);
- /* Prepare to compute actual finalized data */
- RVRindex++;
- COMPUTE_LOC(1); COMPUTE_LOC(2); COMPUTE_LOC(3); COMPUTE_LOC(4);
- COMPUTE_LOC(5); COMPUTE_LOC(6); COMPUTE_LOC(7); COMPUTE_LOC(8);
- /* left channel */
- *srce++ +=RVbufL1[loc1]-RVbufL2[loc2]+RVbufL3[loc3]-RVbufL4[loc4]+
- RVbufL5[loc5]-RVbufL6[loc6]+RVbufL7[loc7]-RVbufL8[loc8];
- }
- }
- static void MixReverb_Stereo(SLONG* srce,NATIVE count)
- {
- unsigned int speedup;
- int ReverbPct;
- unsigned int loc1, loc2, loc3, loc4;
- unsigned int loc5, loc6, loc7, loc8;
- ReverbPct = 92+(md_reverb<<1);
- COMPUTE_LOC(1); COMPUTE_LOC(2); COMPUTE_LOC(3); COMPUTE_LOC(4);
- COMPUTE_LOC(5); COMPUTE_LOC(6); COMPUTE_LOC(7); COMPUTE_LOC(8);
- while(count--) {
- /* Compute the left channel echo buffers */
- speedup = *srce >> 3;
- COMPUTE_LECHO(1); COMPUTE_LECHO(2); COMPUTE_LECHO(3); COMPUTE_LECHO(4);
- COMPUTE_LECHO(5); COMPUTE_LECHO(6); COMPUTE_LECHO(7); COMPUTE_LECHO(8);
- /* Compute the right channel echo buffers */
- speedup = srce[1] >> 3;
- COMPUTE_RECHO(1); COMPUTE_RECHO(2); COMPUTE_RECHO(3); COMPUTE_RECHO(4);
- COMPUTE_RECHO(5); COMPUTE_RECHO(6); COMPUTE_RECHO(7); COMPUTE_RECHO(8);
- /* Prepare to compute actual finalized data */
- RVRindex++;
- COMPUTE_LOC(1); COMPUTE_LOC(2); COMPUTE_LOC(3); COMPUTE_LOC(4);
- COMPUTE_LOC(5); COMPUTE_LOC(6); COMPUTE_LOC(7); COMPUTE_LOC(8);
- /* left channel then right channel */
- *srce++ +=RVbufL1[loc1]-RVbufL2[loc2]+RVbufL3[loc3]-RVbufL4[loc4]+
- RVbufL5[loc5]-RVbufL6[loc6]+RVbufL7[loc7]-RVbufL8[loc8];
- *srce++ +=RVbufR1[loc1]-RVbufR2[loc2]+RVbufR3[loc3]-RVbufR4[loc4]+
- RVbufR5[loc5]-RVbufR6[loc6]+RVbufR7[loc7]-RVbufR8[loc8];
- }
- }
- /* Mixing macros */
- #define EXTRACT_SAMPLE_FP(var,size) var=(*srce++>>(BITSHIFT-size)) * ((1.0f / 32768.0f) / (1 << size))
- #define CHECK_SAMPLE_FP(var,bound) var=(var>bound)?bound:(var<-bound)?-bound:var
- #define PUT_SAMPLE_FP(var) *dste++=var
- static void Mix32ToFP(float* dste,SLONG* srce,NATIVE count)
- {
- float x1,x2,x3,x4;
- int remain;
- #define FP_SHIFT 4
- remain=count&3;
- for(count>>=2;count;count--) {
- EXTRACT_SAMPLE_FP(x1,FP_SHIFT); EXTRACT_SAMPLE_FP(x2,FP_SHIFT);
- EXTRACT_SAMPLE_FP(x3,FP_SHIFT); EXTRACT_SAMPLE_FP(x4,FP_SHIFT);
- CHECK_SAMPLE_FP(x1,1.0f); CHECK_SAMPLE_FP(x2,1.0f);
- CHECK_SAMPLE_FP(x3,1.0f); CHECK_SAMPLE_FP(x4,1.0f);
- PUT_SAMPLE_FP(x1); PUT_SAMPLE_FP(x2);
- PUT_SAMPLE_FP(x3); PUT_SAMPLE_FP(x4);
- }
- while(remain--) {
- EXTRACT_SAMPLE_FP(x1,FP_SHIFT);
- CHECK_SAMPLE_FP(x1,1.0f);
- PUT_SAMPLE_FP(x1);
- }
- }
- /* Mixing macros */
- #define EXTRACT_SAMPLE(var,size) var=*srce++>>(BITSHIFT+16-size)
- #define CHECK_SAMPLE(var,bound) var=(var>=bound)?bound-1:(var<-bound)?-bound:var
- #define PUT_SAMPLE(var) *dste++=var
- static void Mix32To16(SWORD* dste,SLONG* srce,NATIVE count)
- {
- SLONG x1,x2,x3,x4;
- int remain;
- remain=count&3;
- for(count>>=2;count;count--) {
- EXTRACT_SAMPLE(x1,16); EXTRACT_SAMPLE(x2,16);
- EXTRACT_SAMPLE(x3,16); EXTRACT_SAMPLE(x4,16);
- CHECK_SAMPLE(x1,32768); CHECK_SAMPLE(x2,32768);
- CHECK_SAMPLE(x3,32768); CHECK_SAMPLE(x4,32768);
- PUT_SAMPLE(x1); PUT_SAMPLE(x2); PUT_SAMPLE(x3); PUT_SAMPLE(x4);
- }
- while(remain--) {
- EXTRACT_SAMPLE(x1,16);
- CHECK_SAMPLE(x1,32768);
- PUT_SAMPLE(x1);
- }
- }
- static void Mix32To8(SBYTE* dste,SLONG* srce,NATIVE count)
- {
- SWORD x1,x2,x3,x4;
- int remain;
- remain=count&3;
- for(count>>=2;count;count--) {
- EXTRACT_SAMPLE(x1,8); EXTRACT_SAMPLE(x2,8);
- EXTRACT_SAMPLE(x3,8); EXTRACT_SAMPLE(x4,8);
- CHECK_SAMPLE(x1,128); CHECK_SAMPLE(x2,128);
- CHECK_SAMPLE(x3,128); CHECK_SAMPLE(x4,128);
- PUT_SAMPLE(x1+128); PUT_SAMPLE(x2+128);
- PUT_SAMPLE(x3+128); PUT_SAMPLE(x4+128);
- }
- while(remain--) {
- EXTRACT_SAMPLE(x1,8);
- CHECK_SAMPLE(x1,128);
- PUT_SAMPLE(x1+128);
- }
- }
- static void AddChannel(SLONG* ptr,NATIVE todo)
- {
- SLONGLONG end,done;
- SWORD *s;
- if(!(s=Samples[vnf->handle])) {
- vnf->current = vnf->active = 0;
- return;
- }
- /* update the 'current' index so the sample loops, or stops playing if it
- reached the end of the sample */
- while(todo>0) {
- SLONGLONG endpos;
- if(vnf->flags & SF_REVERSE) {
- /* The sample is playing in reverse */
- if((vnf->flags&SF_LOOP)&&(vnf->current<idxlpos)) {
- /* the sample is looping and has reached the loopstart index */
- if(vnf->flags & SF_BIDI) {
- /* sample is doing bidirectional loops, so 'bounce' the
- current index against the idxlpos */
- vnf->current = idxlpos+(idxlpos-vnf->current);
- vnf->flags &= ~SF_REVERSE;
- vnf->increment = -vnf->increment;
- } else
- /* normal backwards looping, so set the current position to
- loopend index */
- vnf->current=idxlend-(idxlpos-vnf->current);
- } else {
- /* the sample is not looping, so check if it reached index 0 */
- if(vnf->current < 0) {
- /* playing index reached 0, so stop playing this sample */
- vnf->current = vnf->active = 0;
- break;
- }
- }
- } else {
- /* The sample is playing forward */
- if((vnf->flags & SF_LOOP) &&
- (vnf->current >= idxlend)) {
- /* the sample is looping, check the loopend index */
- if(vnf->flags & SF_BIDI) {
- /* sample is doing bidirectional loops, so 'bounce' the
- current index against the idxlend */
- vnf->flags |= SF_REVERSE;
- vnf->increment = -vnf->increment;
- vnf->current = idxlend-(vnf->current-idxlend);
- } else
- /* normal backwards looping, so set the current position
- to loopend index */
- vnf->current=idxlpos+(vnf->current-idxlend);
- } else {
- /* sample is not looping, so check if it reached the last
- position */
- if(vnf->current >= idxsize) {
- /* yes, so stop playing this sample */
- vnf->current = vnf->active = 0;
- break;
- }
- }
- }
- end=(vnf->flags&SF_REVERSE)?(vnf->flags&SF_LOOP)?idxlpos:0:
- (vnf->flags&SF_LOOP)?idxlend:idxsize;
- /* if the sample is not blocked... */
- if((end==vnf->current)||(!vnf->increment))
- done=0;
- else {
- done=MIN((end-vnf->current)/vnf->increment+1,todo);
- if(done<0) done=0;
- }
- if(!done) {
- vnf->active = 0;
- break;
- }
- endpos=vnf->current+done*vnf->increment;
- if(vnf->vol) {
- #ifndef NATIVE_64BIT_INT
- /* use the 32 bit mixers as often as we can (they're much faster) */
- if((vnf->current<0x7fffffff)&&(endpos<0x7fffffff)) {
- if((md_mode & DMODE_INTERP)) {
- if(vc_mode & DMODE_STEREO) {
- if((vnf->pan==PAN_SURROUND)&&(md_mode&DMODE_SURROUND))
- vnf->current=Mix32SurroundInterp
- (s,ptr,vnf->current,vnf->increment,done);
- else
- vnf->current=Mix32StereoInterp
- (s,ptr,vnf->current,vnf->increment,done);
- } else
- vnf->current=Mix32MonoInterp
- (s,ptr,vnf->current,vnf->increment,done);
- } else if(vc_mode & DMODE_STEREO) {
- if((vnf->pan==PAN_SURROUND)&&(md_mode&DMODE_SURROUND))
- vnf->current=Mix32SurroundNormal
- (s,ptr,vnf->current,vnf->increment,done);
- else
- vnf->current=Mix32StereoNormal
- (s,ptr,vnf->current,vnf->increment,done);
- } else
- vnf->current=Mix32MonoNormal
- (s,ptr,vnf->current,vnf->increment,done);
- } else
- #endif
- {
- if((md_mode & DMODE_INTERP)) {
- if(vc_mode & DMODE_STEREO) {
- if((vnf->pan==PAN_SURROUND)&&(md_mode&DMODE_SURROUND))
- vnf->current=MixSurroundInterp
- (s,ptr,vnf->current,vnf->increment,done);
- else
- vnf->current=MixStereoInterp
- (s,ptr,vnf->current,vnf->increment,done);
- } else
- vnf->current=MixMonoInterp
- (s,ptr,vnf->current,vnf->increment,done);
- } else if(vc_mode & DMODE_STEREO) {
- if((vnf->pan==PAN_SURROUND)&&(md_mode&DMODE_SURROUND))
- vnf->current=MixSurroundNormal
- (s,ptr,vnf->current,vnf->increment,done);
- else
- vnf->current=MixStereoNormal
- (s,ptr,vnf->current,vnf->increment,done);
- } else
- vnf->current=MixMonoNormal
- (s,ptr,vnf->current,vnf->increment,done);
- }
- } else
- /* update sample position */
- vnf->current=endpos;
- todo-=done;
- ptr +=(vc_mode & DMODE_STEREO)?(done<<1):done;
- }
- }
- #define _IN_VIRTCH_
- #include "virtch_common.c"
- #undef _IN_VIRTCH_
- void VC1_WriteSamples(SBYTE* buf,ULONG todo)
- {
- int left,portion=0,count;
- SBYTE *buffer;
- int t, pan, vol;
- while(todo) {
- if(!tickleft) {
- if(vc_mode & DMODE_SOFT_MUSIC) md_player();
- tickleft=(md_mixfreq*125L)/(md_bpm*50L);
- }
- left = MIN(tickleft, todo);
- buffer = buf;
- tickleft -= left;
- todo -= left;
- buf += samples2bytes(left);
- while(left) {
- portion = MIN(left, samplesthatfit);
- count = (vc_mode & DMODE_STEREO)?(portion<<1):portion;
- memset(vc_tickbuf, 0, count<<2);
- for(t=0;t<vc_softchn;t++) {
- vnf = &vinf[t];
- if(vnf->kick) {
- vnf->current=((SLONGLONG)vnf->start)<<FRACBITS;
- vnf->kick =0;
- vnf->active =1;
- }
- if(!vnf->frq) vnf->active = 0;
- if(vnf->active) {
- vnf->increment=((SLONGLONG)(vnf->frq<<FRACBITS))/md_mixfreq;
- if(vnf->flags&SF_REVERSE) vnf->increment=-vnf->increment;
- vol = vnf->vol; pan = vnf->pan;
- vnf->oldlvol=vnf->lvolsel;vnf->oldrvol=vnf->rvolsel;
- if(vc_mode & DMODE_STEREO) {
- if(pan != PAN_SURROUND) {
- vnf->lvolsel=(vol*(PAN_RIGHT-pan))>>8;
- vnf->rvolsel=(vol*pan)>>8;
- } else
- vnf->lvolsel=vnf->rvolsel=vol/2;
- } else
- vnf->lvolsel=vol;
- idxsize = (vnf->size)? ((SLONGLONG)vnf->size << FRACBITS)-1 : 0;
- idxlend = (vnf->repend)? ((SLONGLONG)vnf->repend << FRACBITS)-1 : 0;
- idxlpos = (SLONGLONG)vnf->reppos << FRACBITS;
- AddChannel(vc_tickbuf, portion);
- }
- }
- if(md_reverb) {
- if(md_reverb>15) md_reverb=15;
- MixReverb(vc_tickbuf, portion);
- }
- if(vc_mode & DMODE_FLOAT)
- Mix32ToFP((float*) buffer, vc_tickbuf, count);
- else if(vc_mode & DMODE_16BITS)
- Mix32To16((SWORD*) buffer, vc_tickbuf, count);
- else
- Mix32To8((SBYTE*) buffer, vc_tickbuf, count);
- buffer += samples2bytes(portion);
- left -= portion;
- }
- }
- }
- BOOL VC1_Init(void)
- {
- VC_SetupPointers();
- if (md_mode&DMODE_HQMIXER)
- return VC2_Init();
- if(!(Samples=(SWORD**)_mm_calloc(MAXSAMPLEHANDLES,sizeof(SWORD*)))) {
- _mm_errno = MMERR_INITIALIZING_MIXER;
- return 1;
- }
- if(!vc_tickbuf)
- if(!(vc_tickbuf=(SLONG*)_mm_malloc((TICKLSIZE+32)*sizeof(SLONG)))) {
- _mm_errno = MMERR_INITIALIZING_MIXER;
- return 1;
- }
- MixReverb=(md_mode&DMODE_STEREO)?MixReverb_Stereo:MixReverb_Normal;
- vc_mode = md_mode;
- return 0;
- }
- BOOL VC1_PlayStart(void)
- {
- samplesthatfit=TICKLSIZE;
- if(vc_mode & DMODE_STEREO) samplesthatfit >>= 1;
- tickleft = 0;
- RVc1 = (5000L * md_mixfreq) / REVERBERATION;
- RVc2 = (5078L * md_mixfreq) / REVERBERATION;
- RVc3 = (5313L * md_mixfreq) / REVERBERATION;
- RVc4 = (5703L * md_mixfreq) / REVERBERATION;
- RVc5 = (6250L * md_mixfreq) / REVERBERATION;
- RVc6 = (6953L * md_mixfreq) / REVERBERATION;
- RVc7 = (7813L * md_mixfreq) / REVERBERATION;
- RVc8 = (8828L * md_mixfreq) / REVERBERATION;
- if(!(RVbufL1=(SLONG*)_mm_calloc((RVc1+1),sizeof(SLONG)))) return 1;
- if(!(RVbufL2=(SLONG*)_mm_calloc((RVc2+1),sizeof(SLONG)))) return 1;
- if(!(RVbufL3=(SLONG*)_mm_calloc((RVc3+1),sizeof(SLONG)))) return 1;
- if(!(RVbufL4=(SLONG*)_mm_calloc((RVc4+1),sizeof(SLONG)))) return 1;
- if(!(RVbufL5=(SLONG*)_mm_calloc((RVc5+1),sizeof(SLONG)))) return 1;
- if(!(RVbufL6=(SLONG*)_mm_calloc((RVc6+1),sizeof(SLONG)))) return 1;
- if(!(RVbufL7=(SLONG*)_mm_calloc((RVc7+1),sizeof(SLONG)))) return 1;
- if(!(RVbufL8=(SLONG*)_mm_calloc((RVc8+1),sizeof(SLONG)))) return 1;
- if(!(RVbufR1=(SLONG*)_mm_calloc((RVc1+1),sizeof(SLONG)))) return 1;
- if(!(RVbufR2=(SLONG*)_mm_calloc((RVc2+1),sizeof(SLONG)))) return 1;
- if(!(RVbufR3=(SLONG*)_mm_calloc((RVc3+1),sizeof(SLONG)))) return 1;
- if(!(RVbufR4=(SLONG*)_mm_calloc((RVc4+1),sizeof(SLONG)))) return 1;
- if(!(RVbufR5=(SLONG*)_mm_calloc((RVc5+1),sizeof(SLONG)))) return 1;
- if(!(RVbufR6=(SLONG*)_mm_calloc((RVc6+1),sizeof(SLONG)))) return 1;
- if(!(RVbufR7=(SLONG*)_mm_calloc((RVc7+1),sizeof(SLONG)))) return 1;
- if(!(RVbufR8=(SLONG*)_mm_calloc((RVc8+1),sizeof(SLONG)))) return 1;
- RVRindex = 0;
- return 0;
- }
- void VC1_PlayStop(void)
- {
- if(RVbufL1) free(RVbufL1);
- if(RVbufL2) free(RVbufL2);
- if(RVbufL3) free(RVbufL3);
- if(RVbufL4) free(RVbufL4);
- if(RVbufL5) free(RVbufL5);
- if(RVbufL6) free(RVbufL6);
- if(RVbufL7) free(RVbufL7);
- if(RVbufL8) free(RVbufL8);
- RVbufL1=RVbufL2=RVbufL3=RVbufL4=RVbufL5=RVbufL6=RVbufL7=RVbufL8=NULL;
- if(RVbufR1) free(RVbufR1);
- if(RVbufR2) free(RVbufR2);
- if(RVbufR3) free(RVbufR3);
- if(RVbufR4) free(RVbufR4);
- if(RVbufR5) free(RVbufR5);
- if(RVbufR6) free(RVbufR6);
- if(RVbufR7) free(RVbufR7);
- if(RVbufR8) free(RVbufR8);
- RVbufR1=RVbufR2=RVbufR3=RVbufR4=RVbufR5=RVbufR6=RVbufR7=RVbufR8=NULL;
- }
- BOOL VC1_SetNumVoices(void)
- {
- int t;
- if(!(vc_softchn=md_softchn)) return 0;
- if(vinf) free(vinf);
- if(!(vinf= _mm_calloc(sizeof(VINFO),vc_softchn))) return 1;
- for(t=0;t<vc_softchn;t++) {
- vinf[t].frq=10000;
- vinf[t].pan=(t&1)?PAN_LEFT:PAN_RIGHT;
- }
- return 0;
- }
- /* ex:set ts=4: */