/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.media.audiofx;
import android.annotation.IntDef;
import android.media.AudioDevice;
import android.media.AudioFormat;
import android.media.audiofx.AudioEffect;
import android.util.Log;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.StringTokenizer;
/**
* An audio virtualizer is a general name for an effect to spatialize audio channels. The exact
* behavior of this effect is dependent on the number of audio input channels and the types and
* number of audio output channels of the device. For example, in the case of a stereo input and
* stereo headphone output, a stereo widening effect is used when this effect is turned on.
* <p>An application creates a Virtualizer object to instantiate and control a virtualizer engine
* in the audio framework.
* <p>The methods, parameter types and units exposed by the Virtualizer implementation are directly
* mapping those defined by the OpenSL ES 1.0.1 Specification (http://www.khronos.org/opensles/)
* for the SLVirtualizerItf interface. Please refer to this specification for more details.
* <p>To attach the Virtualizer to a particular AudioTrack or MediaPlayer, specify the audio session
* ID of this AudioTrack or MediaPlayer when constructing the Virtualizer.
* <p>NOTE: attaching a Virtualizer to the global audio output mix by use of session 0 is
* deprecated.
* <p>See {@link android.media.MediaPlayer#getAudioSessionId()} for details on audio sessions.
* <p>See {@link android.media.audiofx.AudioEffect} class for more details on controlling
* audio effects.
*/
public class Virtualizer extends AudioEffect {
private final static String TAG = "Virtualizer";
private final static boolean DEBUG = false;
// These constants must be synchronized with those in
// system/media/audio_effects/include/audio_effects/effect_virtualizer.h
/**
* Is strength parameter supported by virtualizer engine. Parameter ID for getParameter().
*/
public static final int PARAM_STRENGTH_SUPPORTED = 0;
/**
* Virtualizer effect strength. Parameter ID for
* {@link android.media.audiofx.Virtualizer.OnParameterChangeListener}
*/
public static final int PARAM_STRENGTH = 1;
/**
* @hide
* Parameter ID to query the virtual speaker angles for a channel mask / device configuration.
*/
public static final int PARAM_VIRTUAL_SPEAKER_ANGLES = 2;
/**
* @hide
* Parameter ID to force the virtualization mode to be that of a specific device
*/
public static final int PARAM_FORCE_VIRTUALIZATION_MODE = 3;
/**
* @hide
* Parameter ID to query the current virtualization mode.
*/
public static final int PARAM_VIRTUALIZATION_MODE = 4;
/**
* Indicates if strength parameter is supported by the virtualizer engine
*/
private boolean mStrengthSupported = false;
/**
* Registered listener for parameter changes.
*/
private OnParameterChangeListener mParamListener = null;
/**
* Listener used internally to to receive raw parameter change event from AudioEffect super class
*/
private BaseParameterListener mBaseParamListener = null;
/**
* Lock for access to mParamListener
*/
private final Object mParamListenerLock = new Object();
/**
* Class constructor.
* @param priority the priority level requested by the application for controlling the Virtualizer
* engine. As the same engine can be shared by several applications, this parameter indicates
* how much the requesting application needs control of effect parameters. The normal priority
* is 0, above normal is a positive number, below normal a negative number.
* @param audioSession system wide unique audio session identifier. The Virtualizer will
* be attached to the MediaPlayer or AudioTrack in the same audio session.
*
* @throws java.lang.IllegalStateException
* @throws java.lang.IllegalArgumentException
* @throws java.lang.UnsupportedOperationException
* @throws java.lang.RuntimeException
*/
public Virtualizer(int priority, int audioSession)
throws IllegalStateException, IllegalArgumentException,
UnsupportedOperationException, RuntimeException {
super(EFFECT_TYPE_VIRTUALIZER, EFFECT_TYPE_NULL, priority, audioSession);
if (audioSession == 0) {
Log.w(TAG, "WARNING: attaching a Virtualizer to global output mix is deprecated!");
}
int[] value = new int[1];
checkStatus(getParameter(PARAM_STRENGTH_SUPPORTED, value));
mStrengthSupported = (value[0] != 0);
}
/**
* Indicates whether setting strength is supported. If this method returns false, only one
* strength is supported and the setStrength() method always rounds to that value.
* @return true is strength parameter is supported, false otherwise
*/
public boolean getStrengthSupported() {
return mStrengthSupported;
}
/**
* Sets the strength of the virtualizer effect. If the implementation does not support per mille
* accuracy for setting the strength, it is allowed to round the given strength to the nearest
* supported value. You can use the {@link #getRoundedStrength()} method to query the
* (possibly rounded) value that was actually set.
* @param strength strength of the effect. The valid range for strength strength is [0, 1000],
* where 0 per mille designates the mildest effect and 1000 per mille designates the strongest.
* @throws IllegalStateException
* @throws IllegalArgumentException
* @throws UnsupportedOperationException
*/
public void setStrength(short strength)
throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
checkStatus(setParameter(PARAM_STRENGTH, strength));
}
/**
* Gets the current strength of the effect.
* @return the strength of the effect. The valid range for strength is [0, 1000], where 0 per
* mille designates the mildest effect and 1000 per mille the strongest
* @throws IllegalStateException
* @throws IllegalArgumentException
* @throws UnsupportedOperationException
*/
public short getRoundedStrength()
throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
short[] value = new short[1];
checkStatus(getParameter(PARAM_STRENGTH, value));
return value[0];
}
/**
* Checks if a configuration is supported, and query the virtual speaker angles.
* @param inputChannelMask
* @param deviceType
* @param angles if non-null: array in which the angles will be written. If null, no angles
* are returned
* @return true if the combination of channel mask and output device type is supported, false
* otherwise
* @throws IllegalStateException
* @throws IllegalArgumentException
* @throws UnsupportedOperationException
*/
private boolean getAnglesInt(int inputChannelMask, int deviceType, int[] angles)
throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
// parameter check
if (inputChannelMask == AudioFormat.CHANNEL_INVALID) {
throw (new IllegalArgumentException(
"Virtualizer: illegal CHANNEL_INVALID channel mask"));
}
int channelMask = inputChannelMask == AudioFormat.CHANNEL_OUT_DEFAULT ?
AudioFormat.CHANNEL_OUT_STEREO : inputChannelMask;
int nbChannels = AudioFormat.channelCountFromOutChannelMask(channelMask);
if ((angles != null) && (angles.length < (nbChannels * 3))) {
Log.e(TAG, "Size of array for angles cannot accomodate number of channels in mask ("
+ nbChannels + ")");
throw (new IllegalArgumentException(
"Virtualizer: array for channel / angle pairs is too small: is " + angles.length
+ ", should be " + (nbChannels * 3)));
}
ByteBuffer paramsConverter = ByteBuffer.allocate(3 /* param + mask + device*/ * 4);
paramsConverter.order(ByteOrder.nativeOrder());
paramsConverter.putInt(PARAM_VIRTUAL_SPEAKER_ANGLES);
// convert channel mask to internal native representation
paramsConverter.putInt(AudioFormat.convertChannelOutMaskToNativeMask(channelMask));
// convert Java device type to internal representation
paramsConverter.putInt(AudioDevice.convertDeviceTypeToInternalDevice(deviceType));
// allocate an array to store the results
byte[] result = new byte[nbChannels * 4/*int to byte*/ * 3/*for mask, azimuth, elevation*/];
// call into the effect framework
int status = getParameter(paramsConverter.array(), result);
if (DEBUG) {
Log.v(TAG, "getAngles(0x" + Integer.toHexString(inputChannelMask) + ", 0x"
+ Integer.toHexString(deviceType) + ") returns " + status);
}
if (status >= 0) {
if (angles != null) {
// convert and copy the results
ByteBuffer resultConverter = ByteBuffer.wrap(result);
resultConverter.order(ByteOrder.nativeOrder());
for (int i = 0 ; i < nbChannels ; i++) {
// write the channel mask
angles[3 * i] = AudioFormat.convertNativeChannelMaskToOutMask(
resultConverter.getInt((i * 4 * 3)));
// write the azimuth
angles[3 * i + 1] = resultConverter.getInt(i * 4 * 3 + 4);
// write the elevation
angles[3 * i + 2] = resultConverter.getInt(i * 4 * 3 + 8);
if (DEBUG) {
Log.v(TAG, "channel 0x" + Integer.toHexString(angles[3*i]).toUpperCase()
+ " at az=" + angles[3*i+1] + "deg"
+ " elev=" + angles[3*i+2] + "deg");
}
}
}
return true;
} else if (status == AudioEffect.ERROR_BAD_VALUE) {
// a BAD_VALUE return from getParameter indicates the configuration is not supported
// don't throw an exception, just return false
return false;
} else {
// something wrong may have happened
checkStatus(status);
}
// unexpected virtualizer behavior
Log.e(TAG, "unexpected status code " + status
+ " after getParameter(PARAM_VIRTUAL_SPEAKER_ANGLES)");
return false;
}
/**
* A virtualization mode indicating virtualization processing is not active.
* See {@link #getVirtualizationMode()} as one of the possible return value.
*/
public static final int VIRTUALIZATION_MODE_OFF = 0;
/**
* A virtualization mode used to indicate the virtualizer effect must stop forcing the
* processing to a particular mode in {@link #forceVirtualizationMode(int)}.
*/
public static final int VIRTUALIZATION_MODE_AUTO = 1;
/**
* A virtualization mode typically used over headphones.
* Binaural virtualization describes an audio processing configuration for virtualization
* where the left and right channels are respectively reaching the left and right ear of the
* user, without also feeding the opposite ear (as is the case when listening over speakers).
* <p>Such a mode is therefore meant to be used when audio is playing over stereo wired
* headphones or headsets, but also stereo headphones through a wireless A2DP Bluetooth link.
* <p>See {@link #canVirtualize(int, int)} to verify this mode is supported by this Virtualizer.
*/
public final static int VIRTUALIZATION_MODE_BINAURAL = 2;
/**
* A virtualization mode typically used over speakers.
* Transaural virtualization describes an audio processing configuration that differs from
* binaural (as described in {@link #VIRTUALIZATION_MODE_BINAURAL} in that cross-talk is
* present, i.e. audio played from the left channel also reaches the right ear of the user,
* and vice-versa.
* <p>When supported, such a mode is therefore meant to be used when audio is playing over the
* built-in stereo speakers of a device, if they are featured.
* <p>See {@link #canVirtualize(int, int)} to verify this mode is supported by this Virtualizer.
*/
public final static int VIRTUALIZATION_MODE_TRANSAURAL = 3;
/** @hide */
@IntDef( {
VIRTUALIZATION_MODE_BINAURAL,
VIRTUALIZATION_MODE_TRANSAURAL
})
@Retention(RetentionPolicy.SOURCE)
public @interface VirtualizationMode {}
/** @hide */
@IntDef( {
VIRTUALIZATION_MODE_AUTO,
VIRTUALIZATION_MODE_BINAURAL,
VIRTUALIZATION_MODE_TRANSAURAL
})
@Retention(RetentionPolicy.SOURCE)
public @interface ForceVirtualizationMode {}
private static int getDeviceForModeQuery(@VirtualizationMode int virtualizationMode)
throws IllegalArgumentException {
switch (virtualizationMode) {
case VIRTUALIZATION_MODE_BINAURAL:
return AudioDevice.TYPE_WIRED_HEADPHONES;
case VIRTUALIZATION_MODE_TRANSAURAL:
return AudioDevice.TYPE_BUILTIN_SPEAKER;
default:
throw (new IllegalArgumentException(
"Virtualizer: illegal virtualization mode " + virtualizationMode));
}
}
private static int getDeviceForModeForce(@ForceVirtualizationMode int virtualizationMode)
throws IllegalArgumentException {
if (virtualizationMode == VIRTUALIZATION_MODE_AUTO) {
return AudioDevice.TYPE_UNKNOWN;
} else {
return getDeviceForModeQuery(virtualizationMode);
}
}
private static int deviceToMode(int deviceType) {
switch (deviceType) {
case AudioDevice.TYPE_WIRED_HEADSET:
case AudioDevice.TYPE_WIRED_HEADPHONES:
case AudioDevice.TYPE_BLUETOOTH_SCO:
case AudioDevice.TYPE_BUILTIN_EARPIECE:
return VIRTUALIZATION_MODE_BINAURAL;
case AudioDevice.TYPE_BUILTIN_SPEAKER:
case AudioDevice.TYPE_LINE_ANALOG:
case AudioDevice.TYPE_LINE_DIGITAL:
case AudioDevice.TYPE_BLUETOOTH_A2DP:
case AudioDevice.TYPE_HDMI:
case AudioDevice.TYPE_HDMI_ARC:
case AudioDevice.TYPE_USB_DEVICE:
case AudioDevice.TYPE_USB_ACCESSORY:
case AudioDevice.TYPE_DOCK:
case AudioDevice.TYPE_FM:
case AudioDevice.TYPE_AUX_LINE:
return VIRTUALIZATION_MODE_TRANSAURAL;
case AudioDevice.TYPE_UNKNOWN:
default:
return VIRTUALIZATION_MODE_OFF;
}
}
/**
* Checks if the combination of a channel mask and virtualization mode is supported by this
* virtualizer.
* Some virtualizer implementations may only support binaural processing (i.e. only support
* headphone output, see {@link #VIRTUALIZATION_MODE_BINAURAL}), some may support transaural
* processing (i.e. for speaker output, see {@link #VIRTUALIZATION_MODE_TRANSAURAL}) for the
* built-in speakers. Use this method to query the virtualizer implementation capabilities.
* @param inputChannelMask the channel mask of the content to virtualize.
* @param virtualizationMode the mode for which virtualization processing is to be performed,
* one of {@link #VIRTUALIZATION_MODE_BINAURAL}, {@link #VIRTUALIZATION_MODE_TRANSAURAL}.
* @return true if the combination of channel mask and virtualization mode is supported, false
* otherwise.
* <br>An indication that a certain channel mask is not supported doesn't necessarily mean
* you cannot play content with that channel mask, it more likely implies the content will
* be downmixed before being virtualized. For instance a virtualizer that only supports a
* mask such as {@link AudioFormat#CHANNEL_OUT_STEREO}
* will still be able to process content with a mask of
* {@link AudioFormat#CHANNEL_OUT_5POINT1}, but will downmix the content to stereo first, and
* then will virtualize, as opposed to virtualizing each channel individually.
* @throws IllegalStateException
* @throws IllegalArgumentException
* @throws UnsupportedOperationException
*/
public boolean canVirtualize(int inputChannelMask, @VirtualizationMode int virtualizationMode)
throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
return getAnglesInt(inputChannelMask, getDeviceForModeQuery(virtualizationMode), null);
}
/**
* Queries the virtual speaker angles (azimuth and elevation) for a combination of a channel
* mask and virtualization mode.
* If the virtualization configuration (mask and mode) is supported (see
* {@link #canVirtualize(int, int)}, the array angles will contain upon return the
* definition of each virtual speaker and its azimuth and elevation angles relative to the
* listener.
* <br>Note that in some virtualizer implementations, the angles may be strength-dependent.
* @param inputChannelMask the channel mask of the content to virtualize.
* @param virtualizationMode the mode for which virtualization processing is to be performed,
* one of {@link #VIRTUALIZATION_MODE_BINAURAL}, {@link #VIRTUALIZATION_MODE_TRANSAURAL}.
* @param angles a non-null array whose length is 3 times the number of channels in the channel
* mask.
* If the method indicates the configuration is supported, the array will contain upon return
* triplets of values: for each channel <code>i</code> among the channels of the mask:
* <ul>
* <li>the element at index <code>3*i</code> in the array contains the speaker
* identification (e.g. {@link AudioFormat#CHANNEL_OUT_FRONT_LEFT}),</li>
* <li>the element at index <code>3*i+1</code> contains its corresponding azimuth angle
* expressed in degrees, where 0 is the direction the listener faces, 180 is behind
* the listener, and -90 is to her/his left,</li>
* <li>the element at index <code>3*i+2</code> contains its corresponding elevation angle
* where +90 is directly above the listener, 0 is the horizontal plane, and -90 is
* directly below the listener.</li>
* @return true if the combination of channel mask and virtualization mode is supported, false
* otherwise.
* @throws IllegalStateException
* @throws IllegalArgumentException
* @throws UnsupportedOperationException
*/
public boolean getSpeakerAngles(int inputChannelMask,
@VirtualizationMode int virtualizationMode, int[] angles)
throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
if (angles == null) {
throw (new IllegalArgumentException(
"Virtualizer: illegal null channel / angle array"));
}
return getAnglesInt(inputChannelMask, getDeviceForModeQuery(virtualizationMode), angles);
}
/**
* Forces the virtualizer effect to use the given processing mode.
* The effect must be enabled for the forced mode to be applied.
* @param virtualizationMode one of {@link #VIRTUALIZATION_MODE_BINAURAL},
* {@link #VIRTUALIZATION_MODE_TRANSAURAL} to force a particular processing mode, or
* {@value #VIRTUALIZATION_MODE_AUTO} to stop forcing a mode.
* @return true if the processing mode is supported, and it is successfully set, or
* forcing was successfully disabled, false otherwise.
* @throws IllegalStateException
* @throws IllegalArgumentException
* @throws UnsupportedOperationException
*/
public boolean forceVirtualizationMode(@ForceVirtualizationMode int virtualizationMode)
throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
// convert Java device type to internal representation
int deviceType = getDeviceForModeForce(virtualizationMode);
int internalDevice = AudioDevice.convertDeviceTypeToInternalDevice(deviceType);
int status = setParameter(PARAM_FORCE_VIRTUALIZATION_MODE, internalDevice);
if (status >= 0) {
return true;
} else if (status == AudioEffect.ERROR_BAD_VALUE) {
// a BAD_VALUE return from setParameter indicates the mode can't be forced
// don't throw an exception, just return false
return false;
} else {
// something wrong may have happened
checkStatus(status);
}
// unexpected virtualizer behavior
Log.e(TAG, "unexpected status code " + status
+ " after setParameter(PARAM_FORCE_VIRTUALIZATION_MODE)");
return false;
}
/**
* Return the virtualization mode being used, if any.
* @return the virtualization mode being used.
* If virtualization is not active, the virtualization mode will be
* {@link #VIRTUALIZATION_MODE_OFF}. Otherwise the value will be
* {@link #VIRTUALIZATION_MODE_BINAURAL} or {@link #VIRTUALIZATION_MODE_TRANSAURAL}.
* Virtualization may not be active either because the effect is not enabled or
* because the current output device is not compatible with this virtualization
* implementation.
* @throws IllegalStateException
* @throws UnsupportedOperationException
*/
public int getVirtualizationMode()
throws IllegalStateException, UnsupportedOperationException {
int[] value = new int[1];
int status = getParameter(PARAM_VIRTUALIZATION_MODE, value);
if (status >= 0) {
return deviceToMode(AudioDevice.convertInternalDeviceToDeviceType(value[0]));
} else if (status == AudioEffect.ERROR_BAD_VALUE) {
return VIRTUALIZATION_MODE_OFF;
} else {
// something wrong may have happened
checkStatus(status);
}
// unexpected virtualizer behavior
Log.e(TAG, "unexpected status code " + status
+ " after getParameter(PARAM_VIRTUALIZATION_MODE)");
return VIRTUALIZATION_MODE_OFF;
}
/**
* The OnParameterChangeListener interface defines a method called by the Virtualizer when a
* parameter value has changed.
*/
public interface OnParameterChangeListener {
/**
* Method called when a parameter value has changed. The method is called only if the
* parameter was changed by another application having the control of the same
* Virtualizer engine.
* @param effect the Virtualizer on which the interface is registered.
* @param status status of the set parameter operation.
* @param param ID of the modified parameter. See {@link #PARAM_STRENGTH} ...
* @param value the new parameter value.
*/
void onParameterChange(Virtualizer effect, int status, int param, short value);
}
/**
* Listener used internally to receive unformatted parameter change events from AudioEffect
* super class.
*/
private class BaseParameterListener implements AudioEffect.OnParameterChangeListener {
private BaseParameterListener() {
}
public void onParameterChange(AudioEffect effect, int status, byte[] param, byte[] value) {
OnParameterChangeListener l = null;
synchronized (mParamListenerLock) {
if (mParamListener != null) {
l = mParamListener;
}
}
if (l != null) {
int p = -1;
short v = -1;
if (param.length == 4) {
p = byteArrayToInt(param, 0);
}
if (value.length == 2) {
v = byteArrayToShort(value, 0);
}
if (p != -1 && v != -1) {
l.onParameterChange(Virtualizer.this, status, p, v);
}
}
}
}
/**
* Registers an OnParameterChangeListener interface.
* @param listener OnParameterChangeListener interface registered
*/
public void setParameterListener(OnParameterChangeListener listener) {
synchronized (mParamListenerLock) {
if (mParamListener == null) {
mParamListener = listener;
mBaseParamListener = new BaseParameterListener();
super.setParameterListener(mBaseParamListener);
}
}
}
/**
* The Settings class regroups all virtualizer parameters. It is used in
* conjuntion with getProperties() and setProperties() methods to backup and restore
* all parameters in a single call.
*/
public static class Settings {
public short strength;
public Settings() {
}
/**
* Settings class constructor from a key=value; pairs formatted string. The string is
* typically returned by Settings.toString() method.
* @throws IllegalArgumentException if the string is not correctly formatted.
*/
public Settings(String settings) {
StringTokenizer st = new StringTokenizer(settings, "=;");
int tokens = st.countTokens();
if (st.countTokens() != 3) {
throw new IllegalArgumentException("settings: " + settings);
}
String key = st.nextToken();
if (!key.equals("Virtualizer")) {
throw new IllegalArgumentException(
"invalid settings for Virtualizer: " + key);
}
try {
key = st.nextToken();
if (!key.equals("strength")) {
throw new IllegalArgumentException("invalid key name: " + key);
}
strength = Short.parseShort(st.nextToken());
} catch (NumberFormatException nfe) {
throw new IllegalArgumentException("invalid value for key: " + key);
}
}
@Override
public String toString() {
String str = new String (
"Virtualizer"+
";strength="+Short.toString(strength)
);
return str;
}
};
/**
* Gets the virtualizer properties. This method is useful when a snapshot of current
* virtualizer settings must be saved by the application.
* @return a Virtualizer.Settings object containing all current parameters values
* @throws IllegalStateException
* @throws IllegalArgumentException
* @throws UnsupportedOperationException
*/
public Virtualizer.Settings getProperties()
throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
Settings settings = new Settings();
short[] value = new short[1];
checkStatus(getParameter(PARAM_STRENGTH, value));
settings.strength = value[0];
return settings;
}
/**
* Sets the virtualizer properties. This method is useful when virtualizer settings have to
* be applied from a previous backup.
* @param settings a Virtualizer.Settings object containing the properties to apply
* @throws IllegalStateException
* @throws IllegalArgumentException
* @throws UnsupportedOperationException
*/
public void setProperties(Virtualizer.Settings settings)
throws IllegalStateException, IllegalArgumentException, UnsupportedOperationException {
checkStatus(setParameter(PARAM_STRENGTH, settings.strength));
}
}
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