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comparison playercode/unix_drv/drv_sgi.c @ 8:b30908f9d9f9

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Initial entry of mikmod into the CVS tree.
author darius
date Fri, 23 Jan 1998 16:05:10 +0000
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7:de95ce2eacfd 8:b30908f9d9f9
1 /*
2
3 Name:
4 DRV_SGI.C, version 0.2
5 Copyright 1996 by Stephan Kanthak, kanthak@i6.informatik.rwth-aachen.de
6
7 Version 0.2 - updated to use new driver API
8
9 Description:
10 Mikmod driver for output on SGI audio system (needs libaudio from the
11 dmedia package).
12
13 Portability:
14 SGI only. Mainly based on voxware driver.
15
16 Fragment configuration:
17 =======================
18
19 You can use the environment variables 'MM_SGI_FRAGSIZE' and
20 'MM_SGI_BUFSIZE' to override the default size of the audio buffer. If you
21 experience crackles & pops, try experimenting with these values.
22
23 Please read README.SGI first before contacting the author because there are
24 some things to know about the specials of the SGI audio driver.
25
26 */
27
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <dmedia/audio.h>
33 #include "mikmod.h"
34
35 #define DEFAULT_SGI_FRAGSIZE 5000
36 #define DEFAULT_SGI_BUFSIZE 10000
37
38 static ALconfig sgi_config;
39 static ALport sgi_port;
40 static int sample_factor;
41 static int sgi_fragsize;
42 static int sgi_bufsize;
43 static char* audiobuffer;
44
45
46 static BOOL SGI_IsThere(void)
47 {
48 long params[] = { AL_OUTPUT_RATE, 0 };
49
50 ALqueryparams(AL_DEFAULT_DEVICE, params, 2);
51 if (params[1] != 0) return 1;
52 else return 0;
53 }
54
55 static BOOL SGI_Init(void)
56 {
57 char *env;
58 int play_rate;
59 int fragsize,numfrags;
60 long chpars[] = { AL_OUTPUT_RATE, AL_RATE_22050 };
61
62 printf("SGI audio driver: ");
63 switch(md_mixfreq) {
64 case 22050:
65 chpars[1] = AL_RATE_22050;
66 break;
67 case 44100:
68 chpars[1] = AL_RATE_44100;
69 break;
70 default:
71 printf("mixing rate not supported.\n");
72 return 0;
73 break;
74 }
75 ALsetparams(AL_DEFAULT_DEVICE, chpars, 2);
76
77 if ((sgi_config = ALnewconfig()) == 0) {
78 printf("cannot configure sound device.\n");
79 return 0;
80 }
81
82 if (md_mode & DMODE_16BITS) {
83 if (ALsetwidth(sgi_config, AL_SAMPLE_16) < 0) {
84 printf("samplesize of 16 bits not supported.\n");
85 return 0;
86 }
87 sample_factor = 2;
88 } else {
89 if (ALsetwidth(sgi_config, AL_SAMPLE_8) < 0) {
90 printf("samplesize of 8 bits not supported.\n");
91 return 0;
92 }
93 sample_factor = 1;
94 }
95
96 if (md_mode & DMODE_STEREO) {
97 if (ALsetchannels(sgi_config, AL_STEREO) < 0) {
98 printf("stereo mode not supported.\n");
99 return 0;
100 }
101 } else{
102 if (ALsetchannels(sgi_config, AL_MONO) < 0) {
103 printf("mono mode not supported.\n");
104 return 0;
105 }
106 }
107
108 if(!VC_Init()){
109 return 0;
110 }
111
112 sgi_fragsize=(env=getenv("MM_SGI_FRAGSIZE")) ? atol(env) : DEFAULT_SGI_BUFSIZE;
113 sgi_bufsize=(env=getenv("MM_SGI_BUFSIZE")) ? atol(env) : DEFAULT_SGI_BUFSIZE;
114
115 ALsetqueuesize(sgi_config, sgi_bufsize);
116 if ((sgi_port = ALopenport("Mod4X", "w", sgi_config)) == 0) {
117 printf("cannot open SGI audio port.\n");
118 return 0;
119 }
120 printf("%dHz/%dBits/", md_mixfreq, 8*sample_factor);
121 if (md_mode & DMODE_STEREO) printf("stereo.\n");
122 else printf("mono.\n");
123
124
125 audiobuffer = (char*) MyMalloc(sgi_fragsize * sizeof(char));
126
127 if(audiobuffer==NULL){
128 VC_Exit();
129 return 0;
130 }
131
132 return 1;
133 }
134
135
136 static void SGI_Exit(void)
137 {
138 free(audiobuffer);
139 VC_Exit();
140 }
141
142
143 static void SGI_Update(void)
144 {
145 VC_WriteBytes(audiobuffer, sgi_fragsize);
146 ALwritesamps(sgi_port,audiobuffer, sgi_fragsize/sample_factor);
147 }
148
149
150 DRIVER drv_sgi={
151 NULL,
152 "SGI Audio System",
153 "SGI Audio System Driver v0.2 - by Stephan Kanthak",
154 SGI_IsThere,
155 VC_SampleLoad,
156 VC_SampleUnload,
157 VC_SampleSpace,
158 VC_SampleLength,
159 SGI_Init,
160 SGI_Exit,
161 VC_SetNumChannels,
162 VC_PlayStart,
163 VC_PlayStop,
164 SGI_Update,
165 VC_VoiceSetVolume,
166 VC_VoiceSetFrequency,
167 VC_VoiceSetPanning,
168 VC_VoicePlay,
169 VC_VoiceStop,
170 VC_VoiceStopped,
171 VC_VoiceReleaseSustain,
172 VC_VoiceGetPosition,
173 VC_RealVolume
174 };