diff options
Diffstat (limited to 'apps/plugins/mikmod/virtch_common.c')
-rw-r--r-- | apps/plugins/mikmod/virtch_common.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/apps/plugins/mikmod/virtch_common.c b/apps/plugins/mikmod/virtch_common.c new file mode 100644 index 0000000000..522f4509f0 --- /dev/null +++ b/apps/plugins/mikmod/virtch_common.c | |||
@@ -0,0 +1,464 @@ | |||
1 | /* MikMod sound library | ||
2 | (c) 1998, 1999, 2000, 2001 Miodrag Vallat and others - see file AUTHORS | ||
3 | for complete list. | ||
4 | |||
5 | This library is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU Library General Public License as | ||
7 | published by the Free Software Foundation; either version 2 of | ||
8 | the License, or (at your option) any later version. | ||
9 | |||
10 | This program is distributed in the hope that it will be useful, | ||
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | GNU Library General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Library General Public | ||
16 | License along with this library; if not, write to the Free Software | ||
17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | ||
18 | 02111-1307, USA. | ||
19 | */ | ||
20 | |||
21 | /*============================================================================== | ||
22 | |||
23 | $Id: virtch_common.c,v 1.2 2005/03/30 19:11:50 realtech Exp $ | ||
24 | |||
25 | Common source parts between the two software mixers. | ||
26 | This file is probably the ugliest part of libmikmod... | ||
27 | |||
28 | ==============================================================================*/ | ||
29 | |||
30 | #ifndef _IN_VIRTCH_ | ||
31 | |||
32 | #include "mikmod_internals.h" | ||
33 | |||
34 | extern int VC1_Init(void); | ||
35 | //extern int VC2_Init(void); | ||
36 | static int (*VC_Init_ptr)(void)=VC1_Init; | ||
37 | extern void VC1_Exit(void); | ||
38 | //extern void VC2_Exit(void); | ||
39 | static void (*VC_Exit_ptr)(void)=VC1_Exit; | ||
40 | extern int VC1_SetNumVoices(void); | ||
41 | //extern int VC2_SetNumVoices(void); | ||
42 | static int (*VC_SetNumVoices_ptr)(void); | ||
43 | extern ULONG VC1_SampleSpace(int); | ||
44 | //extern ULONG VC2_SampleSpace(int); | ||
45 | static ULONG (*VC_SampleSpace_ptr)(int); | ||
46 | extern ULONG VC1_SampleLength(int,SAMPLE*); | ||
47 | //extern ULONG VC2_SampleLength(int,SAMPLE*); | ||
48 | static ULONG (*VC_SampleLength_ptr)(int,SAMPLE*); | ||
49 | |||
50 | extern int VC1_PlayStart(void); | ||
51 | //extern int VC2_PlayStart(void); | ||
52 | static int (*VC_PlayStart_ptr)(void); | ||
53 | extern void VC1_PlayStop(void); | ||
54 | extern void VC2_PlayStop(void); | ||
55 | static void (*VC_PlayStop_ptr)(void); | ||
56 | |||
57 | extern SWORD VC1_SampleLoad(struct SAMPLOAD*,int); | ||
58 | //extern SWORD VC2_SampleLoad(struct SAMPLOAD*,int); | ||
59 | static SWORD (*VC_SampleLoad_ptr)(struct SAMPLOAD*,int); | ||
60 | extern void VC1_SampleUnload(SWORD); | ||
61 | //extern void VC2_SampleUnload(SWORD); | ||
62 | static void (*VC_SampleUnload_ptr)(SWORD); | ||
63 | |||
64 | extern ULONG VC1_WriteBytes(SBYTE*,ULONG); | ||
65 | //extern ULONG VC2_WriteBytes(SBYTE*,ULONG); | ||
66 | static ULONG (*VC_WriteBytes_ptr)(SBYTE*,ULONG); | ||
67 | extern ULONG VC1_SilenceBytes(SBYTE*,ULONG); | ||
68 | //extern ULONG VC2_SilenceBytes(SBYTE*,ULONG); | ||
69 | static ULONG (*VC_SilenceBytes_ptr)(SBYTE*,ULONG); | ||
70 | |||
71 | extern void VC1_VoiceSetVolume(UBYTE,UWORD); | ||
72 | //extern void VC2_VoiceSetVolume(UBYTE,UWORD); | ||
73 | static void (*VC_VoiceSetVolume_ptr)(UBYTE,UWORD); | ||
74 | extern UWORD VC1_VoiceGetVolume(UBYTE); | ||
75 | //extern UWORD VC2_VoiceGetVolume(UBYTE); | ||
76 | static UWORD (*VC_VoiceGetVolume_ptr)(UBYTE); | ||
77 | extern void VC1_VoiceSetFrequency(UBYTE,ULONG); | ||
78 | //extern void VC2_VoiceSetFrequency(UBYTE,ULONG); | ||
79 | static void (*VC_VoiceSetFrequency_ptr)(UBYTE,ULONG); | ||
80 | extern ULONG VC1_VoiceGetFrequency(UBYTE); | ||
81 | //extern ULONG VC2_VoiceGetFrequency(UBYTE); | ||
82 | static ULONG (*VC_VoiceGetFrequency_ptr)(UBYTE); | ||
83 | extern void VC1_VoiceSetPanning(UBYTE,ULONG); | ||
84 | //extern void VC2_VoiceSetPanning(UBYTE,ULONG); | ||
85 | static void (*VC_VoiceSetPanning_ptr)(UBYTE,ULONG); | ||
86 | extern ULONG VC1_VoiceGetPanning(UBYTE); | ||
87 | //extern ULONG VC2_VoiceGetPanning(UBYTE); | ||
88 | static ULONG (*VC_VoiceGetPanning_ptr)(UBYTE); | ||
89 | extern void VC1_VoicePlay(UBYTE,SWORD,ULONG,ULONG,ULONG,ULONG,UWORD); | ||
90 | //extern void VC2_VoicePlay(UBYTE,SWORD,ULONG,ULONG,ULONG,ULONG,UWORD); | ||
91 | static void (*VC_VoicePlay_ptr)(UBYTE,SWORD,ULONG,ULONG,ULONG,ULONG,UWORD); | ||
92 | |||
93 | extern void VC1_VoiceStop(UBYTE); | ||
94 | //extern void VC2_VoiceStop(UBYTE); | ||
95 | static void (*VC_VoiceStop_ptr)(UBYTE); | ||
96 | extern int VC1_VoiceStopped(UBYTE); | ||
97 | //extern int VC2_VoiceStopped(UBYTE); | ||
98 | static int (*VC_VoiceStopped_ptr)(UBYTE); | ||
99 | extern SLONG VC1_VoiceGetPosition(UBYTE); | ||
100 | //extern SLONG VC2_VoiceGetPosition(UBYTE); | ||
101 | static SLONG (*VC_VoiceGetPosition_ptr)(UBYTE); | ||
102 | extern ULONG VC1_VoiceRealVolume(UBYTE); | ||
103 | //extern ULONG VC2_VoiceRealVolume(UBYTE); | ||
104 | static ULONG (*VC_VoiceRealVolume_ptr)(UBYTE); | ||
105 | |||
106 | #if defined __STDC__ || defined _MSC_VER || defined MPW_C | ||
107 | #define VC_PROC0(suffix) \ | ||
108 | MIKMODAPI void VC_##suffix (void) { VC_##suffix##_ptr(); } | ||
109 | |||
110 | #define VC_FUNC0(suffix,ret) \ | ||
111 | MIKMODAPI ret VC_##suffix (void) { return VC_##suffix##_ptr(); } | ||
112 | |||
113 | #define VC_PROC1(suffix,typ1) \ | ||
114 | MIKMODAPI void VC_##suffix (typ1 a) { VC_##suffix##_ptr(a); } | ||
115 | |||
116 | #define VC_FUNC1(suffix,ret,typ1) \ | ||
117 | MIKMODAPI ret VC_##suffix (typ1 a) { return VC_##suffix##_ptr(a); } | ||
118 | |||
119 | #define VC_PROC2(suffix,typ1,typ2) \ | ||
120 | MIKMODAPI void VC_##suffix (typ1 a,typ2 b) { VC_##suffix##_ptr(a,b); } | ||
121 | |||
122 | #define VC_FUNC2(suffix,ret,typ1,typ2) \ | ||
123 | MIKMODAPI ret VC_##suffix (typ1 a,typ2 b) { return VC_##suffix##_ptr(a,b); } | ||
124 | #else | ||
125 | #define VC_PROC0(suffix) \ | ||
126 | MIKMODAPI void VC_/**/suffix (void) { VC_/**/suffix/**/_ptr(); } | ||
127 | |||
128 | #define VC_FUNC0(suffix,ret) \ | ||
129 | MIKMODAPI ret VC_/**/suffix (void) { return VC_/**/suffix/**/_ptr(); } | ||
130 | |||
131 | #define VC_PROC1(suffix,typ1) \ | ||
132 | MIKMODAPI void VC_/**/suffix (typ1 a) { VC_/**/suffix/**/_ptr(a); } | ||
133 | |||
134 | #define VC_FUNC1(suffix,ret,typ1) \ | ||
135 | MIKMODAPI ret VC_/**/suffix (typ1 a) { return VC_/**/suffix/**/_ptr(a); } | ||
136 | |||
137 | #define VC_PROC2(suffix,typ1,typ2) \ | ||
138 | MIKMODAPI void VC_/**/suffix (typ1 a,typ2 b) { VC_/**/suffix/**/_ptr(a,b); } | ||
139 | |||
140 | #define VC_FUNC2(suffix,ret,typ1,typ2) \ | ||
141 | MIKMODAPI ret VC_/**/suffix (typ1 a,typ2 b) { return VC_/**/suffix/**/_ptr(a,b); } | ||
142 | #endif | ||
143 | |||
144 | VC_FUNC0(Init,int) | ||
145 | VC_PROC0(Exit) | ||
146 | VC_FUNC0(SetNumVoices,int) | ||
147 | VC_FUNC1(SampleSpace,ULONG,int) | ||
148 | VC_FUNC2(SampleLength,ULONG,int,SAMPLE*) | ||
149 | VC_FUNC0(PlayStart,int) | ||
150 | VC_PROC0(PlayStop) | ||
151 | VC_FUNC2(SampleLoad,SWORD,struct SAMPLOAD*,int) | ||
152 | VC_PROC1(SampleUnload,SWORD) | ||
153 | VC_FUNC2(WriteBytes,ULONG,SBYTE*,ULONG) | ||
154 | VC_FUNC2(SilenceBytes,ULONG,SBYTE*,ULONG) | ||
155 | VC_PROC2(VoiceSetVolume,UBYTE,UWORD) | ||
156 | VC_FUNC1(VoiceGetVolume,UWORD,UBYTE) | ||
157 | VC_PROC2(VoiceSetFrequency,UBYTE,ULONG) | ||
158 | VC_FUNC1(VoiceGetFrequency,ULONG,UBYTE) | ||
159 | VC_PROC2(VoiceSetPanning,UBYTE,ULONG) | ||
160 | VC_FUNC1(VoiceGetPanning,ULONG,UBYTE) | ||
161 | |||
162 | void VC_VoicePlay(UBYTE a,SWORD b,ULONG c,ULONG d,ULONG e,ULONG f,UWORD g) | ||
163 | { VC_VoicePlay_ptr(a,b,c,d,e,f,g); } | ||
164 | |||
165 | VC_PROC1(VoiceStop,UBYTE) | ||
166 | VC_FUNC1(VoiceStopped,int,UBYTE) | ||
167 | VC_FUNC1(VoiceGetPosition,SLONG,UBYTE) | ||
168 | VC_FUNC1(VoiceRealVolume,ULONG,UBYTE) | ||
169 | |||
170 | void VC_SetupPointers(void) | ||
171 | { | ||
172 | /* | ||
173 | if (md_mode&DMODE_HQMIXER) { | ||
174 | VC_Init_ptr=VC2_Init; | ||
175 | VC_Exit_ptr=VC2_Exit; | ||
176 | VC_SetNumVoices_ptr=VC2_SetNumVoices; | ||
177 | VC_SampleSpace_ptr=VC2_SampleSpace; | ||
178 | VC_SampleLength_ptr=VC2_SampleLength; | ||
179 | VC_PlayStart_ptr=VC2_PlayStart; | ||
180 | VC_PlayStop_ptr=VC2_PlayStop; | ||
181 | VC_SampleLoad_ptr=VC2_SampleLoad; | ||
182 | VC_SampleUnload_ptr=VC2_SampleUnload; | ||
183 | VC_WriteBytes_ptr=VC2_WriteBytes; | ||
184 | VC_SilenceBytes_ptr=VC2_SilenceBytes; | ||
185 | VC_VoiceSetVolume_ptr=VC2_VoiceSetVolume; | ||
186 | VC_VoiceGetVolume_ptr=VC2_VoiceGetVolume; | ||
187 | VC_VoiceSetFrequency_ptr=VC2_VoiceSetFrequency; | ||
188 | VC_VoiceGetFrequency_ptr=VC2_VoiceGetFrequency; | ||
189 | VC_VoiceSetPanning_ptr=VC2_VoiceSetPanning; | ||
190 | VC_VoiceGetPanning_ptr=VC2_VoiceGetPanning; | ||
191 | VC_VoicePlay_ptr=VC2_VoicePlay; | ||
192 | VC_VoiceStop_ptr=VC2_VoiceStop; | ||
193 | VC_VoiceStopped_ptr=VC2_VoiceStopped; | ||
194 | VC_VoiceGetPosition_ptr=VC2_VoiceGetPosition; | ||
195 | VC_VoiceRealVolume_ptr=VC2_VoiceRealVolume; | ||
196 | } else { | ||
197 | */ | ||
198 | VC_Init_ptr=VC1_Init; | ||
199 | VC_Exit_ptr=VC1_Exit; | ||
200 | VC_SetNumVoices_ptr=VC1_SetNumVoices; | ||
201 | VC_SampleSpace_ptr=VC1_SampleSpace; | ||
202 | VC_SampleLength_ptr=VC1_SampleLength; | ||
203 | VC_PlayStart_ptr=VC1_PlayStart; | ||
204 | VC_PlayStop_ptr=VC1_PlayStop; | ||
205 | VC_SampleLoad_ptr=VC1_SampleLoad; | ||
206 | VC_SampleUnload_ptr=VC1_SampleUnload; | ||
207 | VC_WriteBytes_ptr=VC1_WriteBytes; | ||
208 | VC_SilenceBytes_ptr=VC1_SilenceBytes; | ||
209 | VC_VoiceSetVolume_ptr=VC1_VoiceSetVolume; | ||
210 | VC_VoiceGetVolume_ptr=VC1_VoiceGetVolume; | ||
211 | VC_VoiceSetFrequency_ptr=VC1_VoiceSetFrequency; | ||
212 | VC_VoiceGetFrequency_ptr=VC1_VoiceGetFrequency; | ||
213 | VC_VoiceSetPanning_ptr=VC1_VoiceSetPanning; | ||
214 | VC_VoiceGetPanning_ptr=VC1_VoiceGetPanning; | ||
215 | VC_VoicePlay_ptr=VC1_VoicePlay; | ||
216 | VC_VoiceStop_ptr=VC1_VoiceStop; | ||
217 | VC_VoiceStopped_ptr=VC1_VoiceStopped; | ||
218 | VC_VoiceGetPosition_ptr=VC1_VoiceGetPosition; | ||
219 | VC_VoiceRealVolume_ptr=VC1_VoiceRealVolume; | ||
220 | //} | ||
221 | } | ||
222 | |||
223 | #else | ||
224 | |||
225 | #ifndef _VIRTCH_COMMON_ | ||
226 | #define _VIRTCH_COMMON_ | ||
227 | |||
228 | static ULONG samples2bytes(ULONG samples) | ||
229 | { | ||
230 | if(vc_mode & DMODE_FLOAT) samples <<= 2; | ||
231 | else if(vc_mode & DMODE_16BITS) samples <<= 1; | ||
232 | if(vc_mode & DMODE_STEREO) samples <<= 1; | ||
233 | return samples; | ||
234 | } | ||
235 | |||
236 | static ULONG bytes2samples(ULONG bytes) | ||
237 | { | ||
238 | if(vc_mode & DMODE_FLOAT) bytes >>= 2; | ||
239 | else if(vc_mode & DMODE_16BITS) bytes >>= 1; | ||
240 | if(vc_mode & DMODE_STEREO) bytes >>= 1; | ||
241 | return bytes; | ||
242 | } | ||
243 | |||
244 | /* Fill the buffer with 'todo' bytes of silence (it depends on the mixing mode | ||
245 | how the buffer is filled) */ | ||
246 | ULONG VC1_SilenceBytes(SBYTE* buf,ULONG todo) | ||
247 | { | ||
248 | todo=samples2bytes(bytes2samples(todo)); | ||
249 | |||
250 | /* clear the buffer to zero (16 bits signed) or 0x80 (8 bits unsigned) */ | ||
251 | if(vc_mode & DMODE_FLOAT) | ||
252 | memset(buf,0,todo); | ||
253 | else if(vc_mode & DMODE_16BITS) | ||
254 | memset(buf,0,todo); | ||
255 | else | ||
256 | memset(buf,0x80,todo); | ||
257 | |||
258 | return todo; | ||
259 | } | ||
260 | |||
261 | void VC1_WriteSamples(SBYTE*,ULONG); | ||
262 | |||
263 | /* Writes 'todo' mixed SBYTES (!!) to 'buf'. It returns the number of SBYTES | ||
264 | actually written to 'buf' (which is rounded to number of samples that fit | ||
265 | into 'todo' bytes). */ | ||
266 | ULONG VC1_WriteBytes(SBYTE* buf,ULONG todo) | ||
267 | { | ||
268 | if(!vc_softchn) | ||
269 | return VC1_SilenceBytes(buf,todo); | ||
270 | |||
271 | todo = bytes2samples(todo); | ||
272 | VC1_WriteSamples(buf,todo); | ||
273 | |||
274 | return samples2bytes(todo); | ||
275 | } | ||
276 | |||
277 | void VC1_Exit(void) | ||
278 | { | ||
279 | if(vc_tickbuf) MikMod_free(vc_tickbuf); | ||
280 | if(vinf) MikMod_free(vinf); | ||
281 | if(Samples) MikMod_free(Samples); | ||
282 | |||
283 | vc_tickbuf = NULL; | ||
284 | vinf = NULL; | ||
285 | Samples = NULL; | ||
286 | |||
287 | VC_SetupPointers(); | ||
288 | } | ||
289 | |||
290 | UWORD VC1_VoiceGetVolume(UBYTE voice) | ||
291 | { | ||
292 | return vinf[voice].vol; | ||
293 | } | ||
294 | |||
295 | ULONG VC1_VoiceGetPanning(UBYTE voice) | ||
296 | { | ||
297 | return vinf[voice].pan; | ||
298 | } | ||
299 | |||
300 | void VC1_VoiceSetFrequency(UBYTE voice,ULONG frq) | ||
301 | { | ||
302 | vinf[voice].frq=frq; | ||
303 | } | ||
304 | |||
305 | ULONG VC1_VoiceGetFrequency(UBYTE voice) | ||
306 | { | ||
307 | return vinf[voice].frq; | ||
308 | } | ||
309 | |||
310 | void VC1_VoicePlay(UBYTE voice,SWORD handle,ULONG start,ULONG size,ULONG reppos,ULONG repend,UWORD flags) | ||
311 | { | ||
312 | vinf[voice].flags = flags; | ||
313 | vinf[voice].handle = handle; | ||
314 | vinf[voice].start = start; | ||
315 | vinf[voice].size = size; | ||
316 | vinf[voice].reppos = reppos; | ||
317 | vinf[voice].repend = repend; | ||
318 | vinf[voice].kick = 1; | ||
319 | } | ||
320 | |||
321 | void VC1_VoiceStop(UBYTE voice) | ||
322 | { | ||
323 | vinf[voice].active = 0; | ||
324 | } | ||
325 | |||
326 | int VC1_VoiceStopped(UBYTE voice) | ||
327 | { | ||
328 | return(vinf[voice].active==0); | ||
329 | } | ||
330 | |||
331 | SLONG VC1_VoiceGetPosition(UBYTE voice) | ||
332 | { | ||
333 | return (SLONG)(vinf[voice].current>>FRACBITS); | ||
334 | } | ||
335 | |||
336 | void VC1_VoiceSetVolume(UBYTE voice,UWORD vol) | ||
337 | { | ||
338 | /* protect against clicks if volume variation is too high */ | ||
339 | if(abs((int)vinf[voice].vol-(int)vol)>32) | ||
340 | vinf[voice].rampvol=CLICK_BUFFER; | ||
341 | vinf[voice].vol=vol; | ||
342 | } | ||
343 | |||
344 | void VC1_VoiceSetPanning(UBYTE voice,ULONG pan) | ||
345 | { | ||
346 | /* protect against clicks if panning variation is too high */ | ||
347 | if(abs((int)vinf[voice].pan-(int)pan)>48) | ||
348 | vinf[voice].rampvol=CLICK_BUFFER; | ||
349 | vinf[voice].pan=pan; | ||
350 | } | ||
351 | |||
352 | /*========== External mixer interface */ | ||
353 | |||
354 | void VC1_SampleUnload(SWORD handle) | ||
355 | { | ||
356 | if (handle<MAXSAMPLEHANDLES) { | ||
357 | if (Samples[handle]) | ||
358 | MikMod_free(Samples[handle]); | ||
359 | Samples[handle]=NULL; | ||
360 | } | ||
361 | } | ||
362 | |||
363 | SWORD VC1_SampleLoad(struct SAMPLOAD* sload,int type) | ||
364 | { | ||
365 | SAMPLE *s = sload->sample; | ||
366 | int handle; | ||
367 | ULONG t, length,loopstart,loopend; | ||
368 | |||
369 | if(type==MD_HARDWARE) return -1; | ||
370 | |||
371 | /* Find empty slot to put sample address in */ | ||
372 | for(handle=0;handle<MAXSAMPLEHANDLES;handle++) | ||
373 | if(!Samples[handle]) break; | ||
374 | |||
375 | if(handle==MAXSAMPLEHANDLES) { | ||
376 | _mm_errno = MMERR_OUT_OF_HANDLES; | ||
377 | return -1; | ||
378 | } | ||
379 | |||
380 | /* Reality check for loop settings */ | ||
381 | if (s->loopend > s->length) | ||
382 | s->loopend = s->length; | ||
383 | if (s->loopstart >= s->loopend) | ||
384 | s->flags &= ~SF_LOOP; | ||
385 | |||
386 | length = s->length; | ||
387 | loopstart = s->loopstart; | ||
388 | loopend = s->loopend; | ||
389 | |||
390 | SL_SampleSigned(sload); | ||
391 | SL_Sample8to16(sload); | ||
392 | |||
393 | if(!(Samples[handle]=(SWORD*)MikMod_malloc((length+20)<<1))) { | ||
394 | _mm_errno = MMERR_SAMPLE_TOO_BIG; | ||
395 | return -1; | ||
396 | } | ||
397 | |||
398 | /* read sample into buffer */ | ||
399 | if (SL_Load(Samples[handle],sload,length)) | ||
400 | return -1; | ||
401 | |||
402 | /* Unclick sample */ | ||
403 | if(s->flags & SF_LOOP) { | ||
404 | if(s->flags & SF_BIDI) | ||
405 | for(t=0;t<16;t++) | ||
406 | Samples[handle][loopend+t]=Samples[handle][(loopend-t)-1]; | ||
407 | else | ||
408 | for(t=0;t<16;t++) | ||
409 | Samples[handle][loopend+t]=Samples[handle][t+loopstart]; | ||
410 | } else | ||
411 | for(t=0;t<16;t++) | ||
412 | Samples[handle][t+length]=0; | ||
413 | |||
414 | return handle; | ||
415 | } | ||
416 | |||
417 | ULONG VC1_SampleSpace(int type) | ||
418 | { | ||
419 | return vc_memory; | ||
420 | } | ||
421 | |||
422 | ULONG VC1_SampleLength(int type,SAMPLE* s) | ||
423 | { | ||
424 | if (!s) return 0; | ||
425 | |||
426 | return (s->length*((s->flags&SF_16BITS)?2:1))+16; | ||
427 | } | ||
428 | |||
429 | ULONG VC1_VoiceRealVolume(UBYTE voice) | ||
430 | { | ||
431 | ULONG i,s,size; | ||
432 | int k,j; | ||
433 | SWORD *smp; | ||
434 | SLONG t; | ||
435 | |||
436 | t = (SLONG)(vinf[voice].current>>FRACBITS); | ||
437 | if(!vinf[voice].active) return 0; | ||
438 | |||
439 | s = vinf[voice].handle; | ||
440 | size = vinf[voice].size; | ||
441 | |||
442 | i=64; t-=64; k=0; j=0; | ||
443 | if(i>size) i = size; | ||
444 | if(t<0) t = 0; | ||
445 | if(t+i > size) t = size-i; | ||
446 | |||
447 | i &= ~1; /* make sure it's EVEN. */ | ||
448 | |||
449 | smp = &Samples[s][t]; | ||
450 | for(;i;i--,smp++) { | ||
451 | if(k<*smp) k = *smp; | ||
452 | if(j>*smp) j = *smp; | ||
453 | } | ||
454 | return abs(k-j); | ||
455 | } | ||
456 | |||
457 | |||
458 | #endif | ||
459 | |||
460 | MikMod_callback_t vc_callback; | ||
461 | |||
462 | #endif | ||
463 | |||
464 | /* ex:set ts=4: */ | ||