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ef79bbde P |
1 | /*************************************************************************** |
2 | oss.c - description | |
3 | ------------------- | |
4 | begin : Wed May 15 2002 | |
5 | copyright : (C) 2002 by Pete Bernert | |
6 | email : BlackDove@addcom.de | |
7 | ***************************************************************************/ | |
8 | /*************************************************************************** | |
9 | * * | |
10 | * This program is free software; you can redistribute it and/or modify * | |
11 | * it under the terms of the GNU General Public License as published by * | |
12 | * the Free Software Foundation; either version 2 of the License, or * | |
13 | * (at your option) any later version. See also the license.txt file for * | |
14 | * additional informations. * | |
15 | * * | |
16 | ***************************************************************************/ | |
17 | ||
07c13dfd | 18 | #include <stdio.h> |
650adfd2 | 19 | #include <string.h> |
07c13dfd | 20 | #include <sys/types.h> |
21 | #include <sys/stat.h> | |
22 | #include <fcntl.h> | |
23 | #include <sys/ioctl.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/soundcard.h> | |
26 | #include "out.h" | |
ef79bbde P |
27 | |
28 | //////////////////////////////////////////////////////////////////////// | |
29 | // oss globals | |
30 | //////////////////////////////////////////////////////////////////////// | |
31 | ||
32 | #define OSS_MODE_STEREO 1 | |
33 | #define OSS_MODE_MONO 0 | |
34 | ||
35 | #define OSS_SPEED_44100 44100 | |
36 | ||
37 | static int oss_audio_fd = -1; | |
38 | extern int errno; | |
39 | ||
40 | //////////////////////////////////////////////////////////////////////// | |
41 | // SETUP SOUND | |
42 | //////////////////////////////////////////////////////////////////////// | |
43 | ||
07c13dfd | 44 | static int oss_init(void) |
ef79bbde P |
45 | { |
46 | int pspeed=44100; | |
47 | int pstereo; | |
48 | int format; | |
49 | int fragsize = 0; | |
50 | int myfrag; | |
51 | int oss_speed, oss_stereo; | |
52 | ||
97ea4077 | 53 | pstereo = OSS_MODE_STEREO; |
ef79bbde P |
54 | oss_speed = pspeed; |
55 | oss_stereo = pstereo; | |
56 | ||
57 | if((oss_audio_fd=open("/dev/dsp",O_WRONLY,0))==-1) | |
58 | { | |
07c13dfd | 59 | printf("OSS device not available\n"); |
60 | return -1; | |
ef79bbde P |
61 | } |
62 | ||
63 | if(ioctl(oss_audio_fd,SNDCTL_DSP_RESET,0)==-1) | |
64 | { | |
65 | printf("Sound reset failed\n"); | |
07c13dfd | 66 | return -1; |
ef79bbde P |
67 | } |
68 | ||
69 | // we use 64 fragments with 1024 bytes each | |
17ed0d69 | 70 | // rearmed: now using 10*4096 for better latency |
ef79bbde | 71 | |
17ed0d69 | 72 | fragsize=12; |
73 | myfrag=(10<<16)|fragsize; | |
ef79bbde P |
74 | |
75 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFRAGMENT,&myfrag)==-1) | |
76 | { | |
77 | printf("Sound set fragment failed!\n"); | |
07c13dfd | 78 | return -1; |
ef79bbde P |
79 | } |
80 | ||
81 | format = AFMT_S16_NE; | |
82 | ||
83 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFMT,&format) == -1) | |
84 | { | |
85 | printf("Sound format not supported!\n"); | |
07c13dfd | 86 | return -1; |
ef79bbde P |
87 | } |
88 | ||
89 | if(format!=AFMT_S16_NE) | |
90 | { | |
91 | printf("Sound format not supported!\n"); | |
07c13dfd | 92 | return -1; |
ef79bbde P |
93 | } |
94 | ||
97ea4077 | 95 | if(ioctl(oss_audio_fd,SNDCTL_DSP_STEREO,&oss_stereo)==-1 || !oss_stereo) |
ef79bbde P |
96 | { |
97 | printf("Stereo mode not supported!\n"); | |
07c13dfd | 98 | return -1; |
ef79bbde P |
99 | } |
100 | ||
ef79bbde P |
101 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SPEED,&oss_speed)==-1) |
102 | { | |
103 | printf("Sound frequency not supported\n"); | |
07c13dfd | 104 | return -1; |
ef79bbde P |
105 | } |
106 | ||
107 | if(oss_speed!=pspeed) | |
108 | { | |
109 | printf("Sound frequency not supported\n"); | |
07c13dfd | 110 | return -1; |
ef79bbde | 111 | } |
07c13dfd | 112 | |
113 | return 0; | |
ef79bbde P |
114 | } |
115 | ||
116 | //////////////////////////////////////////////////////////////////////// | |
117 | // REMOVE SOUND | |
118 | //////////////////////////////////////////////////////////////////////// | |
119 | ||
07c13dfd | 120 | static void oss_finish(void) |
ef79bbde P |
121 | { |
122 | if(oss_audio_fd != -1 ) | |
123 | { | |
124 | close(oss_audio_fd); | |
125 | oss_audio_fd = -1; | |
126 | } | |
127 | } | |
128 | ||
129 | //////////////////////////////////////////////////////////////////////// | |
07c13dfd | 130 | // GET BUFFERED STATUS |
ef79bbde P |
131 | //////////////////////////////////////////////////////////////////////// |
132 | ||
07c13dfd | 133 | static int oss_busy(void) |
ef79bbde P |
134 | { |
135 | audio_buf_info info; | |
136 | unsigned long l; | |
137 | ||
f8edb5bc | 138 | if(oss_audio_fd == -1) return 1; |
ef79bbde P |
139 | if(ioctl(oss_audio_fd,SNDCTL_DSP_GETOSPACE,&info)==-1) |
140 | l=0; | |
141 | else | |
142 | { | |
143 | if(info.fragments<(info.fragstotal>>1)) // can we write in at least the half of fragments? | |
f8edb5bc | 144 | l=1; // -> no? wait |
ef79bbde P |
145 | else l=0; // -> else go on |
146 | } | |
147 | ||
148 | return l; | |
149 | } | |
150 | ||
151 | //////////////////////////////////////////////////////////////////////// | |
152 | // FEED SOUND DATA | |
153 | //////////////////////////////////////////////////////////////////////// | |
154 | ||
07c13dfd | 155 | static void oss_feed(void *buf, int bytes) |
ef79bbde | 156 | { |
650adfd2 | 157 | audio_buf_info info; |
158 | char sbuf[4096]; | |
159 | ||
ef79bbde | 160 | if(oss_audio_fd == -1) return; |
650adfd2 | 161 | if(ioctl(oss_audio_fd,SNDCTL_DSP_GETOSPACE,&info)==0) |
162 | { | |
163 | if(info.fragments==info.fragstotal) | |
164 | { | |
165 | memset(sbuf, 0, sizeof(sbuf)); | |
166 | write(oss_audio_fd, sbuf, sizeof(sbuf)); | |
167 | write(oss_audio_fd, sbuf, sizeof(sbuf)); | |
168 | } | |
169 | } | |
170 | ||
07c13dfd | 171 | write(oss_audio_fd, buf, bytes); |
172 | } | |
173 | ||
174 | void out_register_oss(struct out_driver *drv) | |
175 | { | |
176 | drv->name = "oss"; | |
177 | drv->init = oss_init; | |
178 | drv->finish = oss_finish; | |
179 | drv->busy = oss_busy; | |
180 | drv->feed = oss_feed; | |
ef79bbde | 181 | } |