Audio SDL plugin. Compile and run on the OpenPandora

[mupen64plus-pandora.git] / source / mupen64plus-audio-sdl / src / volume.c

diff --git a/source/mupen64plus-audio-sdl/src/volume.c b/source/mupen64plus-audio-sdl/src/volume.c
new file mode 100644 (file)
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+++ b/source/mupen64plus-audio-sdl/src/volume.c
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *   Mupen64plus-sdl-audio - volume.c                                      *
+ *   Mupen64Plus homepage: http://code.google.com/p/mupen64plus/           *
+ *   Copyright (C) 2007-2008 Richard42 Ebenblues                           *
+ *   Copyright (C) 2002 Hacktarux                                          *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#if defined(HAS_OSS_SUPPORT)
+
+/* Sound volume functions. */
+#include <sys/soundcard.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <unistd.h> /* close() */
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "volume.h"
+
+/* volSet
+ *  Sets volume of left and right PCM channels to given percentage (0-100) value.
+ */
+void volSet(int percent)
+{
+    int ret, vol;
+    int mixerfd = open("/dev/mixer", O_RDONLY);
+
+    if(mixerfd < 0)
+    {
+        perror("/dev/mixer");
+        return;
+    }
+
+    if(percent > 100)
+        percent = 100;
+    else if(percent < 0)
+        percent = 0;
+
+    vol = (percent << 8) + percent; // set both left/right channels to same vol
+    ret = ioctl(mixerfd, MIXER_WRITE(SOUND_MIXER_PCM), &vol);
+    if(ret < 0)
+        perror("Setting PCM volume");
+
+    close(mixerfd);
+}
+
+/* volGet
+ *  Returns volume of PCM channel as a percentage (0-100).
+ *  Returns 0 on error.
+ */
+int volGet(void)
+{
+    int vol, ret;
+    int mixerfd = open("/dev/mixer", O_RDONLY);
+
+    if(mixerfd < 0)
+    {
+        perror("/dev/mixer");
+        return 0;
+    }
+
+    ret = ioctl(mixerfd, MIXER_READ(SOUND_MIXER_PCM), &vol);
+    if(ret < 0)
+        perror("Reading PCM volume");
+
+    close(mixerfd);
+
+    return vol & 0xff; // just return the left channel
+}
+
+#endif /* defined(HAS_OSS_SUPPORT) */