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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 | ||
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 | |
17ed0d69 | 68 | // rearmed: now using 10*4096 for better latency |
ef79bbde | 69 | |
17ed0d69 | 70 | fragsize=12; |
71 | myfrag=(10<<16)|fragsize; | |
ef79bbde P |
72 | |
73 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFRAGMENT,&myfrag)==-1) | |
74 | { | |
75 | printf("Sound set fragment failed!\n"); | |
76 | return; | |
77 | } | |
78 | ||
79 | format = AFMT_S16_NE; | |
80 | ||
81 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFMT,&format) == -1) | |
82 | { | |
83 | printf("Sound format not supported!\n"); | |
84 | return; | |
85 | } | |
86 | ||
87 | if(format!=AFMT_S16_NE) | |
88 | { | |
89 | printf("Sound format not supported!\n"); | |
90 | return; | |
91 | } | |
92 | ||
93 | if(ioctl(oss_audio_fd,SNDCTL_DSP_STEREO,&oss_stereo)==-1) | |
94 | { | |
95 | printf("Stereo mode not supported!\n"); | |
96 | return; | |
97 | } | |
98 | ||
99 | if(oss_stereo!=1) | |
100 | { | |
101 | iDisStereo=1; | |
102 | } | |
103 | ||
104 | if(ioctl(oss_audio_fd,SNDCTL_DSP_SPEED,&oss_speed)==-1) | |
105 | { | |
106 | printf("Sound frequency not supported\n"); | |
107 | return; | |
108 | } | |
109 | ||
110 | if(oss_speed!=pspeed) | |
111 | { | |
112 | printf("Sound frequency not supported\n"); | |
113 | return; | |
114 | } | |
115 | } | |
116 | ||
117 | //////////////////////////////////////////////////////////////////////// | |
118 | // REMOVE SOUND | |
119 | //////////////////////////////////////////////////////////////////////// | |
120 | ||
121 | void RemoveSound(void) | |
122 | { | |
123 | if(oss_audio_fd != -1 ) | |
124 | { | |
125 | close(oss_audio_fd); | |
126 | oss_audio_fd = -1; | |
127 | } | |
128 | } | |
129 | ||
130 | //////////////////////////////////////////////////////////////////////// | |
131 | // GET BYTES BUFFERED | |
132 | //////////////////////////////////////////////////////////////////////// | |
133 | ||
134 | unsigned long SoundGetBytesBuffered(void) | |
135 | { | |
136 | audio_buf_info info; | |
137 | unsigned long l; | |
138 | ||
139 | if(oss_audio_fd == -1) return SOUNDSIZE; | |
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? | |
145 | l=SOUNDSIZE; // -> no? wait | |
146 | else l=0; // -> else go on | |
147 | } | |
148 | ||
149 | return l; | |
150 | } | |
151 | ||
152 | //////////////////////////////////////////////////////////////////////// | |
153 | // FEED SOUND DATA | |
154 | //////////////////////////////////////////////////////////////////////// | |
155 | ||
156 | void SoundFeedStreamData(unsigned char* pSound,long lBytes) | |
157 | { | |
158 | if(oss_audio_fd == -1) return; | |
159 | write(oss_audio_fd,pSound,lBytes); | |
160 | } |