| 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) */ |