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https://github.com/mupen64plus/mupen64plus-oldsvn.git
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141 lines
2.9 KiB
C
141 lines
2.9 KiB
C
/**
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* Mupen64 - volume.c
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* Copyright (C) 2002 Hacktarux
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*
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* Mupen64 homepage: http://mupen64.emulation64.com
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* email address: hacktarux@yahoo.fr
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*
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* If you want to contribute to the project please contact
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* me first (maybe someone is already making what you are
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* planning to do).
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*
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*
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* This program is free software; you can redistribute it and/
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* or modify it under the terms of the GNU General Public Li-
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* cence as published by the Free Software Foundation; either
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* version 2 of the Licence, or any later version.
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*
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* This program is distributed in the hope that it will be use-
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* ful, but WITHOUT ANY WARRANTY; without even the implied war-
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* ranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public Licence for more details.
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*
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* You should have received a copy of the GNU General Public
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* Licence along with this program; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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**/
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/* Sound volume functions.
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*/
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#include <sys/soundcard.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include "volume.h"
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#include "guifuncs.h"
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#include "translate.h"
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static int g_VolMuted = 0; // volume muted?
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/* volSet
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* Sets volume of left and right PCM channels to given percentage (0-100) value.
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*/
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void volSet(int percent)
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{
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int ret, vol;
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int mixerfd = open("/dev/mixer", O_RDONLY);
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if(mixerfd < 0)
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{
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perror("/dev/mixer: ");
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return;
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}
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if(percent > 100)
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percent = 100;
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else if(percent < 0)
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percent = 0;
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// temporary until we can get a volume bar in the emulation window
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info_message(tr("Volume set to %d%%"), percent);
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vol = (percent << 8) + percent; // set both left/right channels to same vol
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ret = ioctl(mixerfd, MIXER_WRITE(SOUND_MIXER_PCM), &vol);
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if(ret < 0)
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perror("Setting PCM volume: ");
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close(mixerfd);
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}
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/* volGet
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* Returns volume of PCM channel as a percentage (0-100).
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*/
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int volGet(void)
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{
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int vol, ret;
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int mixerfd = open("/dev/mixer", O_RDONLY);
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if(mixerfd < 0)
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{
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perror("/dev/mixer: ");
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return;
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}
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ret = ioctl(mixerfd, MIXER_READ(SOUND_MIXER_PCM), &vol);
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if(ret < 0)
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perror("Reading PCM volume: ");
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close(mixerfd);
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return vol & 0xff; // just return the left channel
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}
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/* volMute
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* Mute/unmute volume.
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*/
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void volMute(void)
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{
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static int saveVol = 0;
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if(g_VolMuted)
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{
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volSet(saveVol);
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}
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else
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{
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saveVol = volGet();
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volSet(0);
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}
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g_VolMuted = !g_VolMuted;
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}
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/* volIsMuted
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* Returns 1 if volume is muted, else 0.
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*/
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int volIsMuted(void)
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{
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return g_VolMuted;
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}
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/* volChange
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* Increase/decrease volume by the given percentage.
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*/
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void volChange(int delta)
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{
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// if we're muted, unmute before changing volume
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if(g_VolMuted)
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volMute();
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volSet(volGet() + delta);
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}
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