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comparison playercode/unix_drv/drv_oss.c @ 9:990c9dadb348

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Initial revision
author darius
date Fri, 23 Jan 1998 16:05:10 +0000
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children 32f80cd7bfee
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8:b30908f9d9f9 9:990c9dadb348
1 /*
2
3 Name:
4 DRV_VOX.C
5
6 Description:
7 Mikmod driver for output on linux and FreeBSD Open Sound System (OSS)
8 (/dev/dsp)
9
10 Portability: VoxWare/SS/OSS land. Linux, FreeBSD (NetBSD & SCO?)
11
12 New fragment configuration code done by Rao:
13 ============================================
14
15 You can use the environment variables 'MM_FRAGSIZE' and 'MM_NUMFRAGS' to
16 override the default size & number of audio buffer fragments. If you
17 experience crackles & pops, try experimenting with these values.
18
19 Read experimental.txt within the VoxWare package for information on these
20 options. They are _VERY_ important with relation to sound popping and smooth
21 playback.
22
23 In general, the slower your system, the higher these values need to be.
24
25 MM_NUMFRAGS is within the range 2 to 255 (decimal)
26
27 MM_FRAGSIZE is is within the range 7 to 17 (dec). The requested fragment size
28 will be 2^MM_FRAGSIZE
29
30 - This driver DOES work with MikMod 3.0
31 - modifed to use an ioctl() to figure out how much data to do with
32 each write, keeps us from blocking extensivly
33
34 */
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38 #include <sys/types.h>
39 #include <sys/time.h>
40 #include <sys/stat.h>
41 #include <fcntl.h>
42 #ifdef __FreeBSD__
43 #include <machine/soundcard.h>
44 #else
45 #include <sys/soundcard.h>
46 #endif /* __FreeBSD__ */
47 #include <sys/ioctl.h>
48 #include <sys/wait.h>
49 #include "mikmod.h"
50 #include "mmio.h"
51
52 #define DEFAULT_FRAGSIZE 17
53 #define DEFAULT_NUMFRAGS 4
54
55 static int sndfd;
56 static int fragmentsize;
57 static char* audiobuffer;
58
59
60 static BOOL OSS_IsThere(void)
61 {
62 return (access("/dev/dsp",W_OK)==0);
63 }
64
65
66 static BOOL OSS_Init(void)
67 {
68 char *env;
69 int play_precision,play_stereo,play_rate;
70 int fragsize,numfrags;
71
72 if((sndfd=open("/dev/dsp",O_WRONLY))<0){
73 return 1;
74 }
75
76 fragsize=(env=getenv("MM_FRAGSIZE")) ? atoi(env) : DEFAULT_FRAGSIZE;
77 numfrags=(env=getenv("MM_NUMFRAGS")) ? atoi(env) : DEFAULT_NUMFRAGS;
78
79 if(fragsize<7 || fragsize>17) fragsize=DEFAULT_FRAGSIZE;
80 if(numfrags<2 || numfrags>255) numfrags=DEFAULT_NUMFRAGS;
81
82 fragmentsize=(numfrags<<16) | fragsize;
83
84 #ifndef __FreeBSD__
85 if(ioctl(sndfd, SNDCTL_DSP_SETFRAGMENT, &fragmentsize)<0){
86 close(sndfd);
87 return 1;
88 }
89 #endif /* __FreeBSD__ */
90
91 play_precision = (md_mode & DMODE_16BITS) ? 16 : 8;
92 play_stereo= (md_mode & DMODE_STEREO) ? 1 : 0;
93 play_rate=md_mixfreq;
94
95 if(ioctl(sndfd, SNDCTL_DSP_SAMPLESIZE, &play_precision) == -1 ||
96 ioctl(sndfd, SNDCTL_DSP_STEREO, &play_stereo) == -1 ||
97 ioctl(sndfd, SNDCTL_DSP_SPEED, &play_rate) == -1){
98 close(sndfd);
99 return 1;
100 }
101
102 ioctl(sndfd, SNDCTL_DSP_GETBLKSIZE, &fragmentsize);
103
104 /* Lose this for now - it will confuse ncurses etc...
105 printf("Fragment size is %ld\n",fragmentsize); */
106
107 if(VC_Init()){
108 close(sndfd);
109 return 1;
110 }
111
112 audiobuffer = (char*) _mm_malloc(fragmentsize * sizeof(char) * 2);
113
114 if(audiobuffer==NULL){
115 VC_Exit();
116 close(sndfd);
117 return 1;
118 }
119
120 return 0;
121 }
122
123
124 static void OSS_Exit(void)
125 {
126 free(audiobuffer);
127 VC_Exit();
128 close(sndfd);
129 }
130
131
132 static void OSS_Update(void)
133 {
134 audio_buf_info buffinf;
135 ioctl(sndfd, SNDCTL_DSP_GETOSPACE, &buffinf);
136 VC_WriteBytes(audiobuffer,buffinf.fragments*buffinf.fragsize);
137 write(sndfd,audiobuffer,buffinf.fragments*buffinf.fragsize);
138 }
139
140 BOOL OSS_Reset(void)
141 {
142 ioctl(sndfd, SNDCTL_DSP_RESET);
143 VC_Exit();
144 return VC_Init();
145 }
146
147
148 MDRIVER drv_oss =
149 {
150 NULL,
151 "Open Sound System (OSS)",
152 "Open Sound System (OSS) Driver v1.3 - by Rao & MikMak (with a little hacking from Pete)",
153 0,255,
154 OSS_IsThere,
155 VC_SampleLoad,
156 VC_SampleUnload,
157 VC_SampleSpace,
158 VC_SampleLength,
159 OSS_Init,
160 OSS_Exit,
161 OSS_Reset,
162 VC_SetNumVoices,
163 VC_PlayStart,
164 VC_PlayStop,
165 OSS_Update,
166 VC_VoiceSetVolume,
167 VC_VoiceSetFrequency,
168 VC_VoiceSetPanning,
169 VC_VoicePlay,
170 VC_VoiceStop,
171 VC_VoiceStopped,
172 VC_VoiceReleaseSustain,
173 VC_VoiceGetPosition,
174 VC_VoiceRealVolume
175 };