/*
* AlsaMixer.java
*
* This file is part of Tritonus: http://www.tritonus.org/
*/
/*
* Copyright (c) 2001 by Matthias Pfisterer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
|<--- this code is formatted to fit into 80 columns --->|
*/
package org.tritonus.lowlevel.alsa;
import org.tritonus.share.TDebug;
/** Object carrying a snd_mixer_t.
*/
public class AlsaMixer
{
/*
not private because needed to be accessed by AlsaMixerElement.
(Better solution: inner classes)
*/
/*private*/ long m_lNativeHandle;
static
{
Alsa.loadNativeLibrary();
if (TDebug.TraceAlsaMixerNative)
{
setTrace(true);
}
}
public AlsaMixer(String strMixerName)
throws Exception
{
if (open(0) < 0)
{
throw new Exception();
}
if (attach(strMixerName) < 0)
{
close();
throw new Exception();
}
if (register() < 0)
{
close();
throw new Exception();
}
if (load() < 0)
{
close();
throw new Exception();
}
}
/** Calls snd_mixer_open().
*/
private native int open(int nMode);
/** Calls snd_mixer_attach().
*/
private native int attach(String strCardName);
/** Calls snd_mixer_selem_register(.., NULL, NULL).
This is a hack, taken over from alsamixer.
*/
private native int register();
/** Calls snd_mixer_load().
*/
private native int load();
/** Calls snd_mixer_free().
*/
private native int free();
/** Calls snd_mixer_close().
*/
public native int close();
// getCount() ??
/**
The caller has to allocate the indices and names arrays big
enough to hold information on all controls. If the retrieving
of controls is successful, a positive number (the number of
controls) is returned. If the arrays are not big enough, -1
is returned. In this case, it's the task of the caller to allocate
bigger arrays and try again.
Both arrays must be of the same size.
Calls snd_mixer_first_elem() and snd_mixer_elem_next().
*/
public native int readControlList(int[] anIndices, String[] astrNames);
public static native void setTrace(boolean bTrace);
}
/*** AlsaMixer.java ***/