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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 | ||
e541b8e0 | 37 | #define FRAGMENT_SHIFT 12 |
38 | #define FRAGMENT_SIZE (1 << FRAGMENT_SHIFT) | |
39 | ||
ef79bbde P |
40 | static int oss_audio_fd = -1; |
41 | extern int errno; | |
42 | ||
43 | //////////////////////////////////////////////////////////////////////// | |
44 | // SETUP SOUND | |
45 | //////////////////////////////////////////////////////////////////////// | |
46 | ||
07c13dfd | 47 | static int oss_init(void) |
ef79bbde P |
48 | { |
49 | int pspeed=44100; | |
50 | int pstereo; | |
51 | int format; | |
ef79bbde P |
52 | int myfrag; |
53 | int oss_speed, oss_stereo; | |
54 | ||
97ea4077 | 55 | pstereo = OSS_MODE_STEREO; |
ef79bbde P |
56 | oss_speed = pspeed; |
57 | oss_stereo = pstereo; | |
58 | ||
59 | if((oss_audio_fd=open("/dev/dsp",O_WRONLY,0))==-1) | |
60 | { | |
07c13dfd | 61 | printf("OSS device not available\n"); |
62 | return -1; | |
ef79bbde P |
63 | } |
64 | ||
65 | if(ioctl(oss_audio_fd,SNDCTL_DSP_RESET,0)==-1) | |
66 | { | |
67 | printf("Sound reset failed\n"); | |
07c13dfd | 68 | return -1; |
ef79bbde P |
69 | } |
70 | ||
71 | // we use 64 fragments with 1024 bytes each | |
17ed0d69 | 72 | // rearmed: now using 10*4096 for better latency |
ef79bbde | 73 | |
e541b8e0 | 74 | myfrag = (10<<16) | FRAGMENT_SHIFT; |
ef79bbde P |
75 | |
76 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFRAGMENT,&myfrag)==-1) | |
77 | { | |
78 | printf("Sound set fragment failed!\n"); | |
07c13dfd | 79 | return -1; |
ef79bbde P |
80 | } |
81 | ||
82 | format = AFMT_S16_NE; | |
83 | ||
84 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFMT,&format) == -1) | |
85 | { | |
86 | printf("Sound format not supported!\n"); | |
07c13dfd | 87 | return -1; |
ef79bbde P |
88 | } |
89 | ||
90 | if(format!=AFMT_S16_NE) | |
91 | { | |
92 | printf("Sound format not supported!\n"); | |
07c13dfd | 93 | return -1; |
ef79bbde P |
94 | } |
95 | ||
97ea4077 | 96 | if(ioctl(oss_audio_fd,SNDCTL_DSP_STEREO,&oss_stereo)==-1 || !oss_stereo) |
ef79bbde P |
97 | { |
98 | printf("Stereo mode not supported!\n"); | |
07c13dfd | 99 | return -1; |
ef79bbde P |
100 | } |
101 | ||
ef79bbde P |
102 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SPEED,&oss_speed)==-1) |
103 | { | |
104 | printf("Sound frequency not supported\n"); | |
07c13dfd | 105 | return -1; |
ef79bbde P |
106 | } |
107 | ||
108 | if(oss_speed!=pspeed) | |
109 | { | |
110 | printf("Sound frequency not supported\n"); | |
07c13dfd | 111 | return -1; |
ef79bbde | 112 | } |
07c13dfd | 113 | |
114 | return 0; | |
ef79bbde P |
115 | } |
116 | ||
117 | //////////////////////////////////////////////////////////////////////// | |
118 | // REMOVE SOUND | |
119 | //////////////////////////////////////////////////////////////////////// | |
120 | ||
07c13dfd | 121 | static void oss_finish(void) |
ef79bbde P |
122 | { |
123 | if(oss_audio_fd != -1 ) | |
124 | { | |
125 | close(oss_audio_fd); | |
126 | oss_audio_fd = -1; | |
127 | } | |
128 | } | |
129 | ||
130 | //////////////////////////////////////////////////////////////////////// | |
07c13dfd | 131 | // GET BUFFERED STATUS |
ef79bbde P |
132 | //////////////////////////////////////////////////////////////////////// |
133 | ||
07c13dfd | 134 | static int oss_busy(void) |
ef79bbde P |
135 | { |
136 | audio_buf_info info; | |
137 | unsigned long l; | |
138 | ||
f8edb5bc | 139 | if(oss_audio_fd == -1) return 1; |
ef79bbde P |
140 | if(ioctl(oss_audio_fd,SNDCTL_DSP_GETOSPACE,&info)==-1) |
141 | l=0; | |
142 | else | |
143 | { | |
144 | if(info.fragments<(info.fragstotal>>1)) // can we write in at least the half of fragments? | |
f8edb5bc | 145 | l=1; // -> no? wait |
ef79bbde P |
146 | else l=0; // -> else go on |
147 | } | |
148 | ||
149 | return l; | |
150 | } | |
151 | ||
152 | //////////////////////////////////////////////////////////////////////// | |
153 | // FEED SOUND DATA | |
154 | //////////////////////////////////////////////////////////////////////// | |
155 | ||
07c13dfd | 156 | static void oss_feed(void *buf, int bytes) |
ef79bbde | 157 | { |
650adfd2 | 158 | audio_buf_info info; |
159 | char sbuf[4096]; | |
160 | ||
ef79bbde | 161 | if(oss_audio_fd == -1) return; |
650adfd2 | 162 | if(ioctl(oss_audio_fd,SNDCTL_DSP_GETOSPACE,&info)==0) |
163 | { | |
e541b8e0 | 164 | // for fast forward |
165 | if(bytes > info.fragments * FRAGMENT_SIZE) | |
166 | bytes = info.fragments * FRAGMENT_SIZE; | |
167 | if(bytes == 0) | |
168 | return; | |
169 | ||
650adfd2 | 170 | if(info.fragments==info.fragstotal) |
171 | { | |
172 | memset(sbuf, 0, sizeof(sbuf)); | |
173 | write(oss_audio_fd, sbuf, sizeof(sbuf)); | |
174 | write(oss_audio_fd, sbuf, sizeof(sbuf)); | |
e541b8e0 | 175 | write(oss_audio_fd, sbuf, sizeof(sbuf)); |
650adfd2 | 176 | } |
177 | } | |
178 | ||
07c13dfd | 179 | write(oss_audio_fd, buf, bytes); |
180 | } | |
181 | ||
182 | void out_register_oss(struct out_driver *drv) | |
183 | { | |
184 | drv->name = "oss"; | |
185 | drv->init = oss_init; | |
186 | drv->finish = oss_finish; | |
187 | drv->busy = oss_busy; | |
188 | drv->feed = oss_feed; | |
ef79bbde | 189 | } |