852ee1c3 |
1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
2 | * Mupen64plus-sdl-audio - volume.c * |
3 | * Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ * |
4 | * Copyright (C) 2007-2008 Richard42 Ebenblues * |
5 | * Copyright (C) 2002 Hacktarux * |
6 | * * |
7 | * This program is free software; you can redistribute it and/or modify * |
8 | * it under the terms of the GNU General Public License as published by * |
9 | * the Free Software Foundation; either version 2 of the License, or * |
10 | * (at your option) any later version. * |
11 | * * |
12 | * This program is distributed in the hope that it will be useful, * |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
15 | * GNU General Public License for more details. * |
16 | * * |
17 | * You should have received a copy of the GNU General Public License * |
18 | * along with this program; if not, write to the * |
19 | * Free Software Foundation, Inc., * |
20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * |
21 | * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
22 | |
23 | #if defined(HAS_OSS_SUPPORT) |
24 | |
25 | /* Sound volume functions. */ |
26 | #include <sys/soundcard.h> |
27 | #include <sys/types.h> |
28 | #include <sys/stat.h> |
29 | #include <sys/ioctl.h> |
30 | #include <unistd.h> /* close() */ |
31 | #include <fcntl.h> |
32 | #include <stdio.h> |
33 | #include <errno.h> |
34 | |
35 | #include "volume.h" |
36 | |
37 | /* volSet |
38 | * Sets volume of left and right PCM channels to given percentage (0-100) value. |
39 | */ |
40 | void volSet(int percent) |
41 | { |
42 | int ret, vol; |
43 | int mixerfd = open("/dev/mixer", O_RDONLY); |
44 | |
45 | if(mixerfd < 0) |
46 | { |
47 | perror("/dev/mixer"); |
48 | return; |
49 | } |
50 | |
51 | if(percent > 100) |
52 | percent = 100; |
53 | else if(percent < 0) |
54 | percent = 0; |
55 | |
56 | vol = (percent << 8) + percent; // set both left/right channels to same vol |
57 | ret = ioctl(mixerfd, MIXER_WRITE(SOUND_MIXER_PCM), &vol); |
58 | if(ret < 0) |
59 | perror("Setting PCM volume"); |
60 | |
61 | close(mixerfd); |
62 | } |
63 | |
64 | /* volGet |
65 | * Returns volume of PCM channel as a percentage (0-100). |
66 | * Returns 0 on error. |
67 | */ |
68 | int volGet(void) |
69 | { |
70 | int vol, ret; |
71 | int mixerfd = open("/dev/mixer", O_RDONLY); |
72 | |
73 | if(mixerfd < 0) |
74 | { |
75 | perror("/dev/mixer"); |
76 | return 0; |
77 | } |
78 | |
79 | ret = ioctl(mixerfd, MIXER_READ(SOUND_MIXER_PCM), &vol); |
80 | if(ret < 0) |
81 | perror("Reading PCM volume"); |
82 | |
83 | close(mixerfd); |
84 | |
85 | return vol & 0xff; // just return the left channel |
86 | } |
87 | |
88 | #endif /* defined(HAS_OSS_SUPPORT) */ |