-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy patha_multiv.c
1301 lines (998 loc) · 29.7 KB
/
a_multiv.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
Copyright (C) 1994-1995 Apogee Software, Ltd.
Copyright (C) 2023-2025 Frenkel Smeijers
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/**********************************************************************
module: MULTIVOC.C
author: James R. Dose
date: December 20, 1993
Routines to provide multichannel digitized sound playback for
Sound Blaster compatible sound cards.
(c) Copyright 1993 James R. Dose. All Rights Reserved.
**********************************************************************/
#include <dos.h>
#include <time.h>
#include "id_heads.h"
#include "dmx.h"
#include "a_blast.h"
#include "a_dma.h"
#include "a_inter.h"
#include "a_ll_man.h"
#include "a_multiv.h"
enum MV_Errors
{
MV_Error = -1,
MV_Ok = 0,
MV_UnsupportedCard,
MV_NotInstalled,
MV_NoVoices,
MV_NoMem,
MV_VoiceNotFound,
MV_BlasterError,
MV_DMAFailure
};
typedef enum
{
NoMoreData,
KeepPlaying
} playbackstatus;
typedef struct VoiceNode
{
struct VoiceNode *next;
struct VoiceNode *prev;
void ( *mix )( void );
uint8_t *NextBlock;
uint32_t BlockLength;
uint32_t FixedPointBufferSize;
uint8_t *sound;
uint32_t length;
uint32_t SamplingRate;
uint32_t RateScale;
uint32_t position;
boolean Playing;
int32_t handle;
int32_t priority;
int16_t *LeftVolume;
int16_t *RightVolume;
} VoiceNode;
static playbackstatus MV_GetNextRawBlock(VoiceNode *voice);
typedef struct
{
VoiceNode *start;
VoiceNode *end;
} VList;
#define MV_NumVoices 8
typedef uint8_t HARSH_CLIP_TABLE_8[ MV_NumVoices * 256 ];
void MV_Mix8BitMono(void);
void MV_Mix8BitStereo(void);
void MV_Mix16BitMono(void);
void MV_Mix16BitStereo(void);
#define IS_QUIET( ptr ) ( ( void * )( ptr ) == ( void * )&MV_VolumeTable[ 0 ] )
#define MV_MaxVolume 63
//static signed short MV_VolumeTable[ MV_MaxVolume + 1 ][ 256 ];
static int16_t MV_VolumeTable[ 63 + 1 ][ 256 ];
static boolean MV_Installed = false;
static int32_t MV_SoundCard = AHW_SOUND_BLASTER;
#define MixBufferSize 256
#define NumberOfBuffers 16
#define TotalBufferSize (MixBufferSize * NumberOfBuffers)
static int32_t MV_BufferSize = MixBufferSize;
static int32_t MV_NumberOfBuffers = NumberOfBuffers;
static int32_t MV_MixMode = MONO_8BIT;
static int32_t MV_Channels = 1;
static int32_t MV_Bits = 8;
#define SILENCE_16BIT 0
#define SILENCE_8BIT 0x80808080
static int32_t MV_Silence = SILENCE_8BIT;
static boolean MV_SwapLeftRight = false;
static int32_t MV_RequestedMixRate;
static int32_t MV_MixRate;
static int32_t MV_DMAChannel = -1;
static int32_t MV_BuffShift;
static int32_t MV_TotalMemory;
static int MV_BufferDescriptor;
static boolean MV_BufferEmpty[NumberOfBuffers];
static uint8_t *MV_MixBuffer[NumberOfBuffers + 1];
static VoiceNode *MV_Voices = NULL;
static volatile VList VoiceList = { NULL, NULL };
static volatile VList VoicePool = { NULL, NULL };
#define MV_MinVoiceHandle 1
static int32_t MV_MixPage = 0;
static int32_t MV_VoiceHandle = MV_MinVoiceHandle;
uint8_t *MV_HarshClipTable __attribute__ ((externally_visible));
uint8_t *MV_MixDestination __attribute__ ((externally_visible));
uint32_t MV_MixPosition __attribute__ ((externally_visible));
int16_t *MV_LeftVolume __attribute__ ((externally_visible));
int16_t *MV_RightVolume __attribute__ ((externally_visible));
int32_t MV_SampleSize __attribute__ ((externally_visible)) = 1;
int32_t MV_RightChannelOffset __attribute__ ((externally_visible));
static int32_t MV_ErrorCode = MV_Ok;
#define MV_SetErrorCode( status ) \
MV_ErrorCode = ( status )
/*---------------------------------------------------------------------
Function: MV_Mix
Mixes the sound into the buffer.
---------------------------------------------------------------------*/
uint32_t MV_Position __attribute__ ((externally_visible));
uint32_t MV_Rate __attribute__ ((externally_visible));
uint8_t *MV_Start __attribute__ ((externally_visible));
uint32_t MV_Length __attribute__ ((externally_visible));
static void MV_Mix(VoiceNode *voice, int32_t buffer)
{
int32_t length;
uint32_t FixedPointBufferSize;
if ((voice->length == 0) && (MV_GetNextRawBlock(voice) != KeepPlaying))
return;
length = MixBufferSize;
FixedPointBufferSize = voice->FixedPointBufferSize;
MV_MixDestination = MV_MixBuffer[buffer];
MV_LeftVolume = voice->LeftVolume;
MV_RightVolume = voice->RightVolume;
if ((MV_Channels == 2) && (IS_QUIET(MV_LeftVolume)))
{
MV_LeftVolume = MV_RightVolume;
MV_MixDestination += MV_RightChannelOffset;
}
// Add this voice to the mix
while (length > 0)
{
MV_Start = voice->sound;
MV_Rate = voice->RateScale;
MV_Position = voice->position;
// Check if the last sample in this buffer would be
// beyond the length of the sample block
if ((MV_Position + FixedPointBufferSize) >= voice->length)
{
if (MV_Position < voice->length)
MV_Length = (voice->length - MV_Position + MV_Rate - 1) / MV_Rate;
else
{
MV_GetNextRawBlock(voice);
return;
}
}
else
MV_Length = length;
voice->mix();
if (MV_Length & 1)
{
MV_MixPosition += MV_Rate;
MV_Length -= 1;
}
voice->position = MV_MixPosition;
length -= MV_Length;
if (voice->position >= voice->length)
{
// Get the next block of sound
if (MV_GetNextRawBlock(voice) != KeepPlaying)
return;
if (length > 0)
{
// Get the position of the last sample in the buffer
FixedPointBufferSize = voice->RateScale * (length - 1);
}
}
}
}
/*---------------------------------------------------------------------
Function: MV_PlayVoice
Adds a voice to the play list.
---------------------------------------------------------------------*/
static void MV_PlayVoice(VoiceNode *voice)
{
uint32_t flags = DisableInterrupts();
LL_AddToTail(VoiceNode, &VoiceList, voice);
RestoreInterrupts(flags);
}
/*---------------------------------------------------------------------
Function: MV_StopVoice
Removes the voice from the play list and adds it to the free list.
---------------------------------------------------------------------*/
static void MV_StopVoice(VoiceNode *voice)
{
uint32_t flags = DisableInterrupts();
// move the voice from the play list to the free list
LL_Remove(VoiceNode, &VoiceList, voice);
LL_AddToTail(VoiceNode, &VoicePool, voice);
RestoreInterrupts(flags);
}
static void ClearBuffer_DW(void *ptr, uint32_t data, int32_t length)
{
int32_t i;
for (i = 0; i < length; i++)
((uint32_t *)ptr)[i] = data;
}
/*---------------------------------------------------------------------
Function: MV_ServiceVoc
Starts playback of the waiting buffer and mixes the next one.
---------------------------------------------------------------------*/
static void MV_ServiceVoc(void)
{
VoiceNode *voice;
VoiceNode *next;
uint8_t *buffer;
if (MV_DMAChannel >= 0)
{
// Get the currently playing buffer
buffer = DMA_GetCurrentPos(MV_DMAChannel);
MV_MixPage = (uint32_t)(buffer - MV_MixBuffer[0]);
MV_MixPage >>= MV_BuffShift;
}
// Toggle which buffer we'll mix next
MV_MixPage++;
if (MV_MixPage >= MV_NumberOfBuffers)
MV_MixPage -= MV_NumberOfBuffers;
// Initialize buffer
//Commented out so that the buffer is always cleared.
//This is so the guys at Echo Speech can mix into the
//buffer even when no sounds are playing.
if (!MV_BufferEmpty[MV_MixPage])
{
ClearBuffer_DW(MV_MixBuffer[MV_MixPage], MV_Silence, MV_BufferSize >> 2);
MV_BufferEmpty[MV_MixPage] = true;
}
// Play any waiting voices
voice = VoiceList.start;
while (voice != NULL)
{
MV_BufferEmpty[MV_MixPage] = false;
MV_Mix(voice, MV_MixPage);
next = voice->next;
// Is this voice done?
if (!voice->Playing)
MV_StopVoice(voice);
voice = next;
}
}
/*---------------------------------------------------------------------
Function: MV_GetNextRawBlock
Controls playback of demand fed data.
---------------------------------------------------------------------*/
static playbackstatus MV_GetNextRawBlock(VoiceNode *voice)
{
if (voice->BlockLength == 0)
{
voice->Playing = false;
return NoMoreData;
} else {
voice->sound = voice->NextBlock;
voice->position -= voice->length;
voice->length = voice->BlockLength > 0x8000 ? 0x8000 : voice->BlockLength;
voice->NextBlock += voice->length;
voice->BlockLength -= voice->length;
voice->length <<= 16;
return KeepPlaying;
}
}
/*---------------------------------------------------------------------
Function: MV_GetVoice
Locates the voice with the specified handle.
---------------------------------------------------------------------*/
static VoiceNode *MV_GetVoice(int32_t handle)
{
VoiceNode *voice;
uint32_t flags = DisableInterrupts();
voice = VoiceList.start;
while (voice != NULL)
{
if (handle == voice->handle)
break;
voice = voice->next;
}
RestoreInterrupts(flags);
if (voice == NULL)
MV_SetErrorCode(MV_VoiceNotFound);
return voice;
}
/*---------------------------------------------------------------------
Function: MV_VoicePlaying
Checks if the voice associated with the specified handle is
playing.
---------------------------------------------------------------------*/
boolean MV_VoicePlaying(int32_t handle)
{
VoiceNode *voice;
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return false;
}
voice = MV_GetVoice(handle);
return voice != NULL;
}
/*---------------------------------------------------------------------
Function: MV_KillAllVoices
Stops output of all currently active voices.
---------------------------------------------------------------------*/
static void MV_KillAllVoices(void)
{
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return;
}
// Remove all the voices from the list
while (VoiceList.start != NULL)
{
MV_Kill(VoiceList.start->handle);
}
}
/*---------------------------------------------------------------------
Function: MV_Kill
Stops output of the voice associated with the specified handle.
---------------------------------------------------------------------*/
void MV_Kill(int32_t handle)
{
VoiceNode *voice;
uint32_t flags;
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return;
}
flags = DisableInterrupts();
voice = MV_GetVoice(handle);
if (voice == NULL)
MV_SetErrorCode(MV_VoiceNotFound);
else
MV_StopVoice(voice);
RestoreInterrupts(flags);
}
/*---------------------------------------------------------------------
Function: MV_AllocVoice
Retrieve an inactive or lower priority voice for output.
---------------------------------------------------------------------*/
static VoiceNode *MV_AllocVoice(int32_t priority)
{
VoiceNode *voice;
VoiceNode *node;
uint32_t flags = DisableInterrupts();
// Check if we have any free voices
if (LL_Empty(&VoicePool))
{
// check if we have a higher priority than a voice that is playing.
voice = node = VoiceList.start;
while (node != NULL)
{
if (node->priority < voice->priority)
voice = node;
node = node->next;
}
if (priority >= voice->priority)
MV_Kill( voice->handle );
}
// Check if any voices are in the voice pool
if (LL_Empty(&VoicePool))
{
// No free voices
RestoreInterrupts(flags);
return NULL;
}
voice = VoicePool.start;
LL_Remove(VoiceNode, &VoicePool, voice);
RestoreInterrupts(flags);
// Find a free voice handle
do
{
MV_VoiceHandle++;
if (MV_VoiceHandle < MV_MinVoiceHandle)
MV_VoiceHandle = MV_MinVoiceHandle;
} while (MV_VoicePlaying(MV_VoiceHandle));
voice->handle = MV_VoiceHandle;
return voice;
}
/*---------------------------------------------------------------------
Function: PITCH_GetScale
Returns a fixed-point value to scale number the specified amount.
---------------------------------------------------------------------*/
#define MAXDETUNE 25
static const uint32_t PitchTable[ 12 ][ MAXDETUNE ] =
{
{ 0x10000, 0x10097, 0x1012f, 0x101c7, 0x10260, 0x102f9, 0x10392, 0x1042c,
0x104c6, 0x10561, 0x105fb, 0x10696, 0x10732, 0x107ce, 0x1086a, 0x10907,
0x109a4, 0x10a41, 0x10adf, 0x10b7d, 0x10c1b, 0x10cba, 0x10d59, 0x10df8,
0x10e98 },
{ 0x10f38, 0x10fd9, 0x1107a, 0x1111b, 0x111bd, 0x1125f, 0x11302, 0x113a5,
0x11448, 0x114eb, 0x1158f, 0x11634, 0x116d8, 0x1177e, 0x11823, 0x118c9,
0x1196f, 0x11a16, 0x11abd, 0x11b64, 0x11c0c, 0x11cb4, 0x11d5d, 0x11e06,
0x11eaf },
{ 0x11f59, 0x12003, 0x120ae, 0x12159, 0x12204, 0x122b0, 0x1235c, 0x12409,
0x124b6, 0x12563, 0x12611, 0x126bf, 0x1276d, 0x1281c, 0x128cc, 0x1297b,
0x12a2b, 0x12adc, 0x12b8d, 0x12c3e, 0x12cf0, 0x12da2, 0x12e55, 0x12f08,
0x12fbc },
{ 0x1306f, 0x13124, 0x131d8, 0x1328d, 0x13343, 0x133f9, 0x134af, 0x13566,
0x1361d, 0x136d5, 0x1378d, 0x13846, 0x138fe, 0x139b8, 0x13a72, 0x13b2c,
0x13be6, 0x13ca1, 0x13d5d, 0x13e19, 0x13ed5, 0x13f92, 0x1404f, 0x1410d,
0x141cb },
{ 0x1428a, 0x14349, 0x14408, 0x144c8, 0x14588, 0x14649, 0x1470a, 0x147cc,
0x1488e, 0x14951, 0x14a14, 0x14ad7, 0x14b9b, 0x14c5f, 0x14d24, 0x14dea,
0x14eaf, 0x14f75, 0x1503c, 0x15103, 0x151cb, 0x15293, 0x1535b, 0x15424,
0x154ee },
{ 0x155b8, 0x15682, 0x1574d, 0x15818, 0x158e4, 0x159b0, 0x15a7d, 0x15b4a,
0x15c18, 0x15ce6, 0x15db4, 0x15e83, 0x15f53, 0x16023, 0x160f4, 0x161c5,
0x16296, 0x16368, 0x1643a, 0x1650d, 0x165e1, 0x166b5, 0x16789, 0x1685e,
0x16934 },
{ 0x16a09, 0x16ae0, 0x16bb7, 0x16c8e, 0x16d66, 0x16e3e, 0x16f17, 0x16ff1,
0x170ca, 0x171a5, 0x17280, 0x1735b, 0x17437, 0x17513, 0x175f0, 0x176ce,
0x177ac, 0x1788a, 0x17969, 0x17a49, 0x17b29, 0x17c09, 0x17cea, 0x17dcc,
0x17eae },
{ 0x17f91, 0x18074, 0x18157, 0x1823c, 0x18320, 0x18406, 0x184eb, 0x185d2,
0x186b8, 0x187a0, 0x18888, 0x18970, 0x18a59, 0x18b43, 0x18c2d, 0x18d17,
0x18e02, 0x18eee, 0x18fda, 0x190c7, 0x191b5, 0x192a2, 0x19391, 0x19480,
0x1956f },
{ 0x1965f, 0x19750, 0x19841, 0x19933, 0x19a25, 0x19b18, 0x19c0c, 0x19d00,
0x19df4, 0x19ee9, 0x19fdf, 0x1a0d5, 0x1a1cc, 0x1a2c4, 0x1a3bc, 0x1a4b4,
0x1a5ad, 0x1a6a7, 0x1a7a1, 0x1a89c, 0x1a998, 0x1aa94, 0x1ab90, 0x1ac8d,
0x1ad8b },
{ 0x1ae89, 0x1af88, 0x1b088, 0x1b188, 0x1b289, 0x1b38a, 0x1b48c, 0x1b58f,
0x1b692, 0x1b795, 0x1b89a, 0x1b99f, 0x1baa4, 0x1bbaa, 0x1bcb1, 0x1bdb8,
0x1bec0, 0x1bfc9, 0x1c0d2, 0x1c1dc, 0x1c2e6, 0x1c3f1, 0x1c4fd, 0x1c609,
0x1c716 },
{ 0x1c823, 0x1c931, 0x1ca40, 0x1cb50, 0x1cc60, 0x1cd70, 0x1ce81, 0x1cf93,
0x1d0a6, 0x1d1b9, 0x1d2cd, 0x1d3e1, 0x1d4f6, 0x1d60c, 0x1d722, 0x1d839,
0x1d951, 0x1da69, 0x1db82, 0x1dc9c, 0x1ddb6, 0x1ded1, 0x1dfec, 0x1e109,
0x1e225 },
{ 0x1e343, 0x1e461, 0x1e580, 0x1e6a0, 0x1e7c0, 0x1e8e0, 0x1ea02, 0x1eb24,
0x1ec47, 0x1ed6b, 0x1ee8f, 0x1efb4, 0x1f0d9, 0x1f1ff, 0x1f326, 0x1f44e,
0x1f576, 0x1f69f, 0x1f7c9, 0x1f8f3, 0x1fa1e, 0x1fb4a, 0x1fc76, 0x1fda3,
0x1fed1 }
};
static uint32_t PITCH_GetScale(int32_t pitchoffset)
{
uint32_t scale;
int32_t octaveshift;
int32_t noteshift;
int32_t note;
int32_t detune;
if (pitchoffset == 0)
return PitchTable[0][0];
noteshift = pitchoffset % 1200;
if (noteshift < 0)
noteshift += 1200;
note = noteshift / 100;
detune = (noteshift % 100) / (100 / MAXDETUNE);
octaveshift = (pitchoffset - noteshift) / 1200;
if (detune < 0)
{
detune += (100 / MAXDETUNE);
note--;
if (note < 0)
{
note += 12;
octaveshift--;
}
}
scale = PitchTable[note][detune];
if (octaveshift < 0)
scale >>= -octaveshift;
else
scale <<= octaveshift;
return scale;
}
/*---------------------------------------------------------------------
Function: MV_SetVoicePitch
Sets the pitch for the specified voice.
---------------------------------------------------------------------*/
static void MV_SetVoicePitch(VoiceNode *voice, uint32_t rate, int32_t pitchoffset)
{
voice->SamplingRate = rate;
voice->RateScale = (rate * PITCH_GetScale(pitchoffset)) / MV_MixRate;
// Multiply by MixBufferSize - 1
voice->FixedPointBufferSize = (voice->RateScale * MixBufferSize) - voice->RateScale;
}
/*---------------------------------------------------------------------
Function: MV_GetVolumeTable
Returns a pointer to the volume table associated with the specified
volume.
---------------------------------------------------------------------*/
static int16_t *MV_GetVolumeTable(int32_t vol)
{
int16_t *table;
if (vol > 255)
vol = 255;
else if (vol < 0)
vol = 0;
vol = vol >> 2;
table = (int16_t *) &MV_VolumeTable[vol];
return table;
}
/*---------------------------------------------------------------------
Function: MV_SetVoiceMixMode
Selects which method should be used to mix the voice.
---------------------------------------------------------------------*/
#define T_SIXTEENBIT_STEREO 0
#define T_8BITS 1
#define T_MONO 2
#define T_LEFTQUIET 8
#define T_RIGHTQUIET 16
#define T_DEFAULT T_SIXTEENBIT_STEREO
static void MV_SetVoiceMixMode(VoiceNode *voice)
{
uint32_t flags;
int32_t test;
flags = DisableInterrupts();
test = T_DEFAULT;
if (MV_Bits == 8)
test |= T_8BITS;
if (MV_Channels == 1)
test |= T_MONO;
else
{
if (IS_QUIET(voice->RightVolume))
test |= T_RIGHTQUIET;
else if (IS_QUIET(voice->LeftVolume))
test |= T_LEFTQUIET;
}
switch (test)
{
case T_8BITS | T_MONO:
voice->mix = MV_Mix8BitMono;
break;
case T_8BITS | T_LEFTQUIET:
MV_LeftVolume = MV_RightVolume;
voice->mix = MV_Mix8BitMono;
break;
case T_8BITS | T_RIGHTQUIET:
voice->mix = MV_Mix8BitMono;
break;
case T_8BITS:
voice->mix = MV_Mix8BitStereo;
break;
case T_MONO:
voice->mix = MV_Mix16BitMono;
break;
case T_LEFTQUIET:
MV_LeftVolume = MV_RightVolume;
voice->mix = MV_Mix16BitMono;
break;
case T_RIGHTQUIET:
voice->mix = MV_Mix16BitMono;
break;
case T_SIXTEENBIT_STEREO:
voice->mix = MV_Mix16BitStereo;
break;
default:
voice->mix = MV_Mix8BitMono;
}
RestoreInterrupts(flags);
}
/*---------------------------------------------------------------------
Function: MV_SetVoiceVolume
Sets the stereo and mono volume level of the voice associated
with the specified handle.
---------------------------------------------------------------------*/
static void MV_SetVoiceVolume(VoiceNode *voice, int32_t vol, int32_t left, int32_t right)
{
if (MV_Channels == 1)
{
left = vol;
right = vol;
}
if (MV_SwapLeftRight)
{
// SBPro uses reversed panning
voice->LeftVolume = MV_GetVolumeTable(right);
voice->RightVolume = MV_GetVolumeTable(left);
} else {
voice->LeftVolume = MV_GetVolumeTable(left);
voice->RightVolume = MV_GetVolumeTable(right);
}
MV_SetVoiceMixMode(voice);
}
/*---------------------------------------------------------------------
Function: MV_SetOrigin
Sets the stereo and mono volume level of the voice associated with the specified handle.
Sets the pitch for the voice associated with the specified handle.
---------------------------------------------------------------------*/
void MV_SetOrigin(int32_t handle, int32_t pitchoffset, int32_t vol, int32_t left, int32_t right)
{
VoiceNode *voice;
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return;
}
voice = MV_GetVoice(handle);
if (voice == NULL)
MV_SetErrorCode(MV_VoiceNotFound);
else {
MV_SetVoicePitch(voice, voice->SamplingRate, pitchoffset);
MV_SetVoiceVolume(voice, vol, left, right);
}
}
/*---------------------------------------------------------------------
Function: MV_SetMixMode
Prepares Multivoc to play stereo of mono digitized sounds.
---------------------------------------------------------------------*/
static void MV_SetMixMode(void)
{
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return;
}
switch(MV_SoundCard)
{
case AHW_SOUND_BLASTER:
MV_MixMode = BLASTER_SetMixMode(STEREO | SIXTEEN_BIT);
break;
}
MV_Channels = MV_MixMode & STEREO ? 2 : 1;
MV_Bits = MV_MixMode & SIXTEEN_BIT ? 16 : 8;
MV_BuffShift = 7 + MV_Channels;
MV_SampleSize = MV_Channels;
if (MV_Bits == 8)
MV_Silence = SILENCE_8BIT;
else
{
MV_Silence = SILENCE_16BIT;
MV_BuffShift += 1;
MV_SampleSize *= 2;
}
MV_BufferSize = MixBufferSize * MV_SampleSize;
MV_NumberOfBuffers = TotalBufferSize / MV_BufferSize;
MV_RightChannelOffset = MV_SampleSize / 2;
}
/*---------------------------------------------------------------------
Function: MV_StartPlayback
Starts the sound playback engine.
---------------------------------------------------------------------*/
static int32_t MV_StartPlayback(void)
{
int32_t status;
int32_t buffer;
// Initialize the buffers
ClearBuffer_DW(MV_MixBuffer[0], MV_Silence, TotalBufferSize >> 2);
for (buffer = 0; buffer < MV_NumberOfBuffers; buffer++)
MV_BufferEmpty[buffer] = true;
// Set the mix buffer variables
MV_MixPage = 1;
// Start playback
switch (MV_SoundCard)
{
case AHW_SOUND_BLASTER:
status = BLASTER_BeginBufferedPlayback(MV_MixBuffer[0], TotalBufferSize, MV_NumberOfBuffers, MV_RequestedMixRate, MV_MixMode, MV_ServiceVoc);
if (status != BLASTER_Ok)
{
MV_SetErrorCode(MV_BlasterError);
return MV_Error;
}
MV_MixRate = BLASTER_GetPlaybackRate();
MV_DMAChannel = BLASTER_GetDMAChannel();
break;
}
return MV_Ok;
}
/*---------------------------------------------------------------------
Function: MV_StopPlayback
Stops the sound playback engine.
---------------------------------------------------------------------*/
static void MV_StopPlayback(void)
{
VoiceNode *voice;
VoiceNode *next;
uint32_t flags;
// Stop sound playback
switch (MV_SoundCard)
{
case AHW_SOUND_BLASTER:
BLASTER_StopPlayback();
break;
}
// Make sure all callbacks are done.
flags = DisableInterrupts();
voice = VoiceList.start;
while (voice != NULL)
{
next = voice->next;
MV_StopVoice(voice);
voice = next;
}
RestoreInterrupts(flags);
}
/*---------------------------------------------------------------------
Function: MV_PlayRaw
Begin playback of sound data with the given sound levels and
priority.
---------------------------------------------------------------------*/
int32_t MV_PlayRaw(uint8_t *ptr, uint32_t length, uint32_t rate, int32_t pitchoffset, int32_t vol, int32_t left, int32_t right, int32_t priority)
{
VoiceNode *voice;
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return MV_Error;
}
// Request a voice from the voice pool
voice = MV_AllocVoice(priority);
if (voice == NULL)
{
MV_SetErrorCode(MV_NoVoices);
return MV_Error;
}
voice->Playing = true;
voice->NextBlock = ptr;
voice->position = 0;
voice->BlockLength = length;
voice->length = 0;
voice->next = NULL;
voice->prev = NULL;
voice->priority = priority;
MV_SetVoicePitch(voice, rate, pitchoffset);
MV_SetVoiceVolume(voice, vol, left, right);
MV_PlayVoice(voice);
return voice->handle;
}
/*---------------------------------------------------------------------
Function: MV_SetVolume
Sets the volume of digitized sound playback.
Create the table used to convert sound data to a specific volume
level.
---------------------------------------------------------------------*/
static void MV_SetVolume(void)
{
int32_t volume;
int32_t val;
int32_t i;
for (volume = 0; volume < 128; volume++)
{
MV_HarshClipTable[volume] = 0;
MV_HarshClipTable[volume + 384] = 255;
}
for (volume = 0; volume < 256; volume++)
MV_HarshClipTable[volume + 128] = volume;
// For each volume level, create a translation table with the
// appropriate volume calculated.
for (volume = 0; volume <= MV_MaxVolume; volume++)
{