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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 | ||
18 | #include "stdafx.h" | |
19 | ||
20 | #define _IN_OSS | |
21 | ||
22 | #include "externals.h" | |
23 | ||
24 | //////////////////////////////////////////////////////////////////////// | |
25 | // oss globals | |
26 | //////////////////////////////////////////////////////////////////////// | |
27 | ||
28 | #define OSS_MODE_STEREO 1 | |
29 | #define OSS_MODE_MONO 0 | |
30 | ||
31 | #define OSS_SPEED_44100 44100 | |
32 | ||
33 | static int oss_audio_fd = -1; | |
34 | extern int errno; | |
35 | ||
36 | //////////////////////////////////////////////////////////////////////// | |
37 | // SETUP SOUND | |
38 | //////////////////////////////////////////////////////////////////////// | |
39 | ||
40 | void SetupSound(void) | |
41 | { | |
42 | int pspeed=44100; | |
43 | int pstereo; | |
44 | int format; | |
45 | int fragsize = 0; | |
46 | int myfrag; | |
47 | int oss_speed, oss_stereo; | |
48 | ||
49 | if(iDisStereo) pstereo=OSS_MODE_MONO; | |
50 | else pstereo=OSS_MODE_STEREO; | |
51 | ||
52 | oss_speed = pspeed; | |
53 | oss_stereo = pstereo; | |
54 | ||
55 | if((oss_audio_fd=open("/dev/dsp",O_WRONLY,0))==-1) | |
56 | { | |
57 | printf("Sound device not available!\n"); | |
58 | return; | |
59 | } | |
60 | ||
61 | if(ioctl(oss_audio_fd,SNDCTL_DSP_RESET,0)==-1) | |
62 | { | |
63 | printf("Sound reset failed\n"); | |
64 | return; | |
65 | } | |
66 | ||
67 | // we use 64 fragments with 1024 bytes each | |
68 | ||
69 | fragsize=10; | |
70 | myfrag=(63<<16)|fragsize; | |
71 | ||
72 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFRAGMENT,&myfrag)==-1) | |
73 | { | |
74 | printf("Sound set fragment failed!\n"); | |
75 | return; | |
76 | } | |
77 | ||
78 | format = AFMT_S16_NE; | |
79 | ||
80 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFMT,&format) == -1) | |
81 | { | |
82 | printf("Sound format not supported!\n"); | |
83 | return; | |
84 | } | |
85 | ||
86 | if(format!=AFMT_S16_NE) | |
87 | { | |
88 | printf("Sound format not supported!\n"); | |
89 | return; | |
90 | } | |
91 | ||
92 | if(ioctl(oss_audio_fd,SNDCTL_DSP_STEREO,&oss_stereo)==-1) | |
93 | { | |
94 | printf("Stereo mode not supported!\n"); | |
95 | return; | |
96 | } | |
97 | ||
98 | if(oss_stereo!=1) | |
99 | { | |
100 | iDisStereo=1; | |
101 | } | |
102 | ||
103 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SPEED,&oss_speed)==-1) | |
104 | { | |
105 | printf("Sound frequency not supported\n"); | |
106 | return; | |
107 | } | |
108 | ||
109 | if(oss_speed!=pspeed) | |
110 | { | |
111 | printf("Sound frequency not supported\n"); | |
112 | return; | |
113 | } | |
114 | } | |
115 | ||
116 | //////////////////////////////////////////////////////////////////////// | |
117 | // REMOVE SOUND | |
118 | //////////////////////////////////////////////////////////////////////// | |
119 | ||
120 | void RemoveSound(void) | |
121 | { | |
122 | if(oss_audio_fd != -1 ) | |
123 | { | |
124 | close(oss_audio_fd); | |
125 | oss_audio_fd = -1; | |
126 | } | |
127 | } | |
128 | ||
129 | //////////////////////////////////////////////////////////////////////// | |
130 | // GET BYTES BUFFERED | |
131 | //////////////////////////////////////////////////////////////////////// | |
132 | ||
133 | unsigned long SoundGetBytesBuffered(void) | |
134 | { | |
135 | audio_buf_info info; | |
136 | unsigned long l; | |
137 | ||
138 | if(oss_audio_fd == -1) return SOUNDSIZE; | |
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? | |
144 | l=SOUNDSIZE; // -> no? wait | |
145 | else l=0; // -> else go on | |
146 | } | |
147 | ||
148 | return l; | |
149 | } | |
150 | ||
151 | //////////////////////////////////////////////////////////////////////// | |
152 | // FEED SOUND DATA | |
153 | //////////////////////////////////////////////////////////////////////// | |
154 | ||
155 | void SoundFeedStreamData(unsigned char* pSound,long lBytes) | |
156 | { | |
157 | if(oss_audio_fd == -1) return; | |
158 | write(oss_audio_fd,pSound,lBytes); | |
159 | } |