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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> |
19 | #include <sys/types.h> | |
20 | #include <sys/stat.h> | |
21 | #include <fcntl.h> | |
22 | #include <sys/ioctl.h> | |
23 | #include <unistd.h> | |
24 | #include <sys/soundcard.h> | |
25 | #include "out.h" | |
ef79bbde P |
26 | |
27 | //////////////////////////////////////////////////////////////////////// | |
28 | // oss globals | |
29 | //////////////////////////////////////////////////////////////////////// | |
30 | ||
31 | #define OSS_MODE_STEREO 1 | |
32 | #define OSS_MODE_MONO 0 | |
33 | ||
34 | #define OSS_SPEED_44100 44100 | |
35 | ||
36 | static int oss_audio_fd = -1; | |
37 | extern int errno; | |
38 | ||
39 | //////////////////////////////////////////////////////////////////////// | |
40 | // SETUP SOUND | |
41 | //////////////////////////////////////////////////////////////////////// | |
42 | ||
07c13dfd | 43 | static int oss_init(void) |
ef79bbde P |
44 | { |
45 | int pspeed=44100; | |
46 | int pstereo; | |
47 | int format; | |
48 | int fragsize = 0; | |
49 | int myfrag; | |
50 | int oss_speed, oss_stereo; | |
51 | ||
97ea4077 | 52 | pstereo = OSS_MODE_STEREO; |
ef79bbde P |
53 | oss_speed = pspeed; |
54 | oss_stereo = pstereo; | |
55 | ||
56 | if((oss_audio_fd=open("/dev/dsp",O_WRONLY,0))==-1) | |
57 | { | |
07c13dfd | 58 | printf("OSS device not available\n"); |
59 | return -1; | |
ef79bbde P |
60 | } |
61 | ||
62 | if(ioctl(oss_audio_fd,SNDCTL_DSP_RESET,0)==-1) | |
63 | { | |
64 | printf("Sound reset failed\n"); | |
07c13dfd | 65 | return -1; |
ef79bbde P |
66 | } |
67 | ||
68 | // we use 64 fragments with 1024 bytes each | |
17ed0d69 | 69 | // rearmed: now using 10*4096 for better latency |
ef79bbde | 70 | |
17ed0d69 | 71 | fragsize=12; |
72 | myfrag=(10<<16)|fragsize; | |
ef79bbde P |
73 | |
74 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFRAGMENT,&myfrag)==-1) | |
75 | { | |
76 | printf("Sound set fragment failed!\n"); | |
07c13dfd | 77 | return -1; |
ef79bbde P |
78 | } |
79 | ||
80 | format = AFMT_S16_NE; | |
81 | ||
82 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFMT,&format) == -1) | |
83 | { | |
84 | printf("Sound format not supported!\n"); | |
07c13dfd | 85 | return -1; |
ef79bbde P |
86 | } |
87 | ||
88 | if(format!=AFMT_S16_NE) | |
89 | { | |
90 | printf("Sound format not supported!\n"); | |
07c13dfd | 91 | return -1; |
ef79bbde P |
92 | } |
93 | ||
97ea4077 | 94 | if(ioctl(oss_audio_fd,SNDCTL_DSP_STEREO,&oss_stereo)==-1 || !oss_stereo) |
ef79bbde P |
95 | { |
96 | printf("Stereo mode not supported!\n"); | |
07c13dfd | 97 | return -1; |
ef79bbde P |
98 | } |
99 | ||
ef79bbde P |
100 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SPEED,&oss_speed)==-1) |
101 | { | |
102 | printf("Sound frequency not supported\n"); | |
07c13dfd | 103 | return -1; |
ef79bbde P |
104 | } |
105 | ||
106 | if(oss_speed!=pspeed) | |
107 | { | |
108 | printf("Sound frequency not supported\n"); | |
07c13dfd | 109 | return -1; |
ef79bbde | 110 | } |
07c13dfd | 111 | |
112 | return 0; | |
ef79bbde P |
113 | } |
114 | ||
115 | //////////////////////////////////////////////////////////////////////// | |
116 | // REMOVE SOUND | |
117 | //////////////////////////////////////////////////////////////////////// | |
118 | ||
07c13dfd | 119 | static void oss_finish(void) |
ef79bbde P |
120 | { |
121 | if(oss_audio_fd != -1 ) | |
122 | { | |
123 | close(oss_audio_fd); | |
124 | oss_audio_fd = -1; | |
125 | } | |
126 | } | |
127 | ||
128 | //////////////////////////////////////////////////////////////////////// | |
07c13dfd | 129 | // GET BUFFERED STATUS |
ef79bbde P |
130 | //////////////////////////////////////////////////////////////////////// |
131 | ||
07c13dfd | 132 | static int oss_busy(void) |
ef79bbde P |
133 | { |
134 | audio_buf_info info; | |
135 | unsigned long l; | |
136 | ||
f8edb5bc | 137 | if(oss_audio_fd == -1) return 1; |
ef79bbde P |
138 | if(ioctl(oss_audio_fd,SNDCTL_DSP_GETOSPACE,&info)==-1) |
139 | l=0; | |
140 | else | |
141 | { | |
142 | if(info.fragments<(info.fragstotal>>1)) // can we write in at least the half of fragments? | |
f8edb5bc | 143 | l=1; // -> no? wait |
ef79bbde P |
144 | else l=0; // -> else go on |
145 | } | |
146 | ||
147 | return l; | |
148 | } | |
149 | ||
150 | //////////////////////////////////////////////////////////////////////// | |
151 | // FEED SOUND DATA | |
152 | //////////////////////////////////////////////////////////////////////// | |
153 | ||
07c13dfd | 154 | static void oss_feed(void *buf, int bytes) |
ef79bbde P |
155 | { |
156 | if(oss_audio_fd == -1) return; | |
07c13dfd | 157 | write(oss_audio_fd, buf, bytes); |
158 | } | |
159 | ||
160 | void out_register_oss(struct out_driver *drv) | |
161 | { | |
162 | drv->name = "oss"; | |
163 | drv->init = oss_init; | |
164 | drv->finish = oss_finish; | |
165 | drv->busy = oss_busy; | |
166 | drv->feed = oss_feed; | |
ef79bbde | 167 | } |