288 lines
11 KiB
Java
288 lines
11 KiB
Java
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.media.audiofx;
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import android.media.audiofx.AudioEffect;
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import android.util.Log;
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import java.util.StringTokenizer;
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/**
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* Bass boost is an audio effect to boost or amplify low frequencies of the sound. It is comparable
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* to a simple equalizer but limited to one band amplification in the low frequency range.
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* <p>An application creates a BassBoost object to instantiate and control a bass boost engine in
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* the audio framework.
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* <p>The methods, parameter types and units exposed by the BassBoost implementation are directly
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* mapping those defined by the OpenSL ES 1.0.1 Specification (http://www.khronos.org/opensles/)
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* for the SLBassBoostItf interface. Please refer to this specification for more details.
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* <p>To attach the BassBoost to a particular AudioTrack or MediaPlayer, specify the audio session
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* ID of this AudioTrack or MediaPlayer when constructing the BassBoost.
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* <p>NOTE: attaching a BassBoost to the global audio output mix by use of session 0 is deprecated.
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* <p>See {@link android.media.MediaPlayer#getAudioSessionId()} for details on audio sessions.
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* <p>See {@link android.media.audiofx.AudioEffect} class for more details on
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* controlling audio effects.
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*/
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public class BassBoost extends AudioEffect {
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private final static String TAG = "BassBoost";
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// These constants must be synchronized with those in
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// frameworks/base/include/media/EffectBassBoostApi.h
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/**
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* Is strength parameter supported by bass boost engine. Parameter ID for getParameter().
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*/
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public static final int PARAM_STRENGTH_SUPPORTED = 0;
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/**
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* Bass boost effect strength. Parameter ID for
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* {@link android.media.audiofx.BassBoost.OnParameterChangeListener}
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*/
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public static final int PARAM_STRENGTH = 1;
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/**
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* Indicates if strength parameter is supported by the bass boost engine
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*/
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private boolean mStrengthSupported = false;
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/**
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* Registered listener for parameter changes.
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*/
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private OnParameterChangeListener mParamListener = null;
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/**
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* Listener used internally to to receive raw parameter change event from AudioEffect super class
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*/
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private BaseParameterListener mBaseParamListener = null;
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/**
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* Lock for access to mParamListener
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*/
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private final Object mParamListenerLock = new Object();
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/**
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* Class constructor.
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* @param priority the priority level requested by the application for controlling the BassBoost
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* engine. As the same engine can be shared by several applications, this parameter indicates
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* how much the requesting application needs control of effect parameters. The normal priority
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* is 0, above normal is a positive number, below normal a negative number.
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* @param audioSession system wide unique audio session identifier. The BassBoost will be
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* attached to the MediaPlayer or AudioTrack in the same audio session.
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*
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* @throws java.lang.IllegalStateException
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* @throws java.lang.IllegalArgumentException
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* @throws java.lang.UnsupportedOperationException
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* @throws java.lang.RuntimeException
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*/
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public BassBoost(int priority, int audioSession)
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throws IllegalStateException, IllegalArgumentException,
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UnsupportedOperationException, RuntimeException {
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super(EFFECT_TYPE_BASS_BOOST, EFFECT_TYPE_NULL, priority, audioSession);
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if (audioSession == 0) {
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Log.w(TAG, "WARNING: attaching a BassBoost to global output mix is deprecated!");
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}
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int[] value = new int[1];
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checkStatus(getParameter(PARAM_STRENGTH_SUPPORTED, value));
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mStrengthSupported = (value[0] != 0);
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}
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/**
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* Indicates whether setting strength is supported. If this method returns false, only one
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* strength is supported and the setStrength() method always rounds to that value.
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* @return true is strength parameter is supported, false otherwise
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*/
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public boolean getStrengthSupported() {
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return mStrengthSupported;
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}
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/**
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* Sets the strength of the bass boost effect. If the implementation does not support per mille
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* accuracy for setting the strength, it is allowed to round the given strength to the nearest
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* supported value. You can use the {@link #getRoundedStrength()} method to query the
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* (possibly rounded) value that was actually set.
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* @param strength strength of the effect. The valid range for strength strength is [0, 1000],
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* where 0 per mille designates the mildest effect and 1000 per mille designates the strongest.
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* @throws IllegalStateException
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* @throws IllegalArgumentException
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* @throws UnsupportedOperationException
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*/
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public void setStrength(short strength)
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throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
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checkStatus(setParameter(PARAM_STRENGTH, strength));
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}
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/**
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* Gets the current strength of the effect.
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* @return the strength of the effect. The valid range for strength is [0, 1000], where 0 per
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* mille designates the mildest effect and 1000 per mille the strongest
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* @throws IllegalStateException
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* @throws IllegalArgumentException
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* @throws UnsupportedOperationException
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*/
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public short getRoundedStrength()
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throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
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short[] value = new short[1];
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checkStatus(getParameter(PARAM_STRENGTH, value));
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return value[0];
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}
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/**
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* The OnParameterChangeListener interface defines a method called by the BassBoost when a
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* parameter value has changed.
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*/
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public interface OnParameterChangeListener {
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/**
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* Method called when a parameter value has changed. The method is called only if the
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* parameter was changed by another application having the control of the same
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* BassBoost engine.
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* @param effect the BassBoost on which the interface is registered.
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* @param status status of the set parameter operation.
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* @param param ID of the modified parameter. See {@link #PARAM_STRENGTH} ...
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* @param value the new parameter value.
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*/
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void onParameterChange(BassBoost effect, int status, int param, short value);
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}
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/**
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* Listener used internally to receive unformatted parameter change events from AudioEffect
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* super class.
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*/
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private class BaseParameterListener implements AudioEffect.OnParameterChangeListener {
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private BaseParameterListener() {
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}
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public void onParameterChange(AudioEffect effect, int status, byte[] param, byte[] value) {
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OnParameterChangeListener l = null;
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synchronized (mParamListenerLock) {
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if (mParamListener != null) {
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l = mParamListener;
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}
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}
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if (l != null) {
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int p = -1;
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short v = -1;
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if (param.length == 4) {
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p = byteArrayToInt(param, 0);
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}
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if (value.length == 2) {
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v = byteArrayToShort(value, 0);
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}
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if (p != -1 && v != -1) {
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l.onParameterChange(BassBoost.this, status, p, v);
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}
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}
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}
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}
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/**
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* Registers an OnParameterChangeListener interface.
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* @param listener OnParameterChangeListener interface registered
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*/
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public void setParameterListener(OnParameterChangeListener listener) {
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synchronized (mParamListenerLock) {
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if (mParamListener == null) {
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mParamListener = listener;
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mBaseParamListener = new BaseParameterListener();
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super.setParameterListener(mBaseParamListener);
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}
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}
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}
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/**
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* The Settings class regroups all bass boost parameters. It is used in
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* conjuntion with getProperties() and setProperties() methods to backup and restore
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* all parameters in a single call.
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*/
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public static class Settings {
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public short strength;
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public Settings() {
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}
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/**
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* Settings class constructor from a key=value; pairs formatted string. The string is
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* typically returned by Settings.toString() method.
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* @throws IllegalArgumentException if the string is not correctly formatted.
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*/
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public Settings(String settings) {
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StringTokenizer st = new StringTokenizer(settings, "=;");
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int tokens = st.countTokens();
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if (st.countTokens() != 3) {
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throw new IllegalArgumentException("settings: " + settings);
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}
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String key = st.nextToken();
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if (!key.equals("BassBoost")) {
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throw new IllegalArgumentException(
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"invalid settings for BassBoost: " + key);
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}
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try {
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key = st.nextToken();
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if (!key.equals("strength")) {
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throw new IllegalArgumentException("invalid key name: " + key);
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}
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strength = Short.parseShort(st.nextToken());
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} catch (NumberFormatException nfe) {
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throw new IllegalArgumentException("invalid value for key: " + key);
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}
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}
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@Override
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public String toString() {
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String str = new String (
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"BassBoost"+
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";strength="+Short.toString(strength)
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);
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return str;
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}
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};
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/**
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* Gets the bass boost properties. This method is useful when a snapshot of current
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* bass boost settings must be saved by the application.
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* @return a BassBoost.Settings object containing all current parameters values
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* @throws IllegalStateException
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* @throws IllegalArgumentException
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* @throws UnsupportedOperationException
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*/
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public BassBoost.Settings getProperties()
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throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
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Settings settings = new Settings();
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short[] value = new short[1];
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checkStatus(getParameter(PARAM_STRENGTH, value));
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settings.strength = value[0];
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return settings;
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}
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/**
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* Sets the bass boost properties. This method is useful when bass boost settings have to
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* be applied from a previous backup.
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* @param settings a BassBoost.Settings object containing the properties to apply
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* @throws IllegalStateException
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* @throws IllegalArgumentException
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* @throws UnsupportedOperationException
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*/
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public void setProperties(BassBoost.Settings settings)
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throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
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checkStatus(setParameter(PARAM_STRENGTH, settings.strength));
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}
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}
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