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/*
* Copyright (C) 2008 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;
import android.annotation.IntDef;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* The AudioFormat class is used to access a number of audio format and
* channel configuration constants. They are for instance used
* in {@link AudioTrack} and {@link AudioRecord}.
*
*/
public class AudioFormat {
//---------------------------------------------------------
// Constants
//--------------------
/** Invalid audio data format */
public static final int ENCODING_INVALID = 0;
/** Default audio data format */
public static final int ENCODING_DEFAULT = 1;
// These values must be kept in sync with core/jni/android_media_AudioFormat.h
/** Audio data format: PCM 16 bit per sample. Guaranteed to be supported by devices. */
public static final int ENCODING_PCM_16BIT = 2;
/** Audio data format: PCM 8 bit per sample. Not guaranteed to be supported by devices. */
public static final int ENCODING_PCM_8BIT = 3;
/** Audio data format: single-precision floating-point per sample */
public static final int ENCODING_PCM_FLOAT = 4;
/** Audio data format: AC-3 compressed */
public static final int ENCODING_AC3 = 5;
/** Audio data format: E-AC-3 compressed */
public static final int ENCODING_E_AC3 = 6;
/** Invalid audio channel configuration */
/** @deprecated use CHANNEL_INVALID instead */
@Deprecated public static final int CHANNEL_CONFIGURATION_INVALID = 0;
/** Default audio channel configuration */
/** @deprecated use CHANNEL_OUT_DEFAULT or CHANNEL_IN_DEFAULT instead */
@Deprecated public static final int CHANNEL_CONFIGURATION_DEFAULT = 1;
/** Mono audio configuration */
/** @deprecated use CHANNEL_OUT_MONO or CHANNEL_IN_MONO instead */
@Deprecated public static final int CHANNEL_CONFIGURATION_MONO = 2;
/** Stereo (2 channel) audio configuration */
/** @deprecated use CHANNEL_OUT_STEREO or CHANNEL_IN_STEREO instead */
@Deprecated public static final int CHANNEL_CONFIGURATION_STEREO = 3;
/** Invalid audio channel mask */
public static final int CHANNEL_INVALID = 0;
/** Default audio channel mask */
public static final int CHANNEL_OUT_DEFAULT = 1;
// Output channel mask definitions below are translated to the native values defined in
// in /system/core/include/system/audio.h in the JNI code of AudioTrack
public static final int CHANNEL_OUT_FRONT_LEFT = 0x4;
public static final int CHANNEL_OUT_FRONT_RIGHT = 0x8;
public static final int CHANNEL_OUT_FRONT_CENTER = 0x10;
public static final int CHANNEL_OUT_LOW_FREQUENCY = 0x20;
public static final int CHANNEL_OUT_BACK_LEFT = 0x40;
public static final int CHANNEL_OUT_BACK_RIGHT = 0x80;
public static final int CHANNEL_OUT_FRONT_LEFT_OF_CENTER = 0x100;
public static final int CHANNEL_OUT_FRONT_RIGHT_OF_CENTER = 0x200;
public static final int CHANNEL_OUT_BACK_CENTER = 0x400;
public static final int CHANNEL_OUT_SIDE_LEFT = 0x800;
public static final int CHANNEL_OUT_SIDE_RIGHT = 0x1000;
/** @hide */
public static final int CHANNEL_OUT_TOP_CENTER = 0x2000;
/** @hide */
public static final int CHANNEL_OUT_TOP_FRONT_LEFT = 0x4000;
/** @hide */
public static final int CHANNEL_OUT_TOP_FRONT_CENTER = 0x8000;
/** @hide */
public static final int CHANNEL_OUT_TOP_FRONT_RIGHT = 0x10000;
/** @hide */
public static final int CHANNEL_OUT_TOP_BACK_LEFT = 0x20000;
/** @hide */
public static final int CHANNEL_OUT_TOP_BACK_CENTER = 0x40000;
/** @hide */
public static final int CHANNEL_OUT_TOP_BACK_RIGHT = 0x80000;
public static final int CHANNEL_OUT_MONO = CHANNEL_OUT_FRONT_LEFT;
public static final int CHANNEL_OUT_STEREO = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT);
// aka QUAD_BACK
public static final int CHANNEL_OUT_QUAD = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |
CHANNEL_OUT_BACK_LEFT | CHANNEL_OUT_BACK_RIGHT);
/** @hide */
public static final int CHANNEL_OUT_QUAD_SIDE = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |
CHANNEL_OUT_SIDE_LEFT | CHANNEL_OUT_SIDE_RIGHT);
public static final int CHANNEL_OUT_SURROUND = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |
CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_BACK_CENTER);
// aka 5POINT1_BACK
public static final int CHANNEL_OUT_5POINT1 = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |
CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_LOW_FREQUENCY | CHANNEL_OUT_BACK_LEFT | CHANNEL_OUT_BACK_RIGHT);
/** @hide */
public static final int CHANNEL_OUT_5POINT1_SIDE = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |
CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_LOW_FREQUENCY |
CHANNEL_OUT_SIDE_LEFT | CHANNEL_OUT_SIDE_RIGHT);
// TODO does this need an @deprecated ?
// different from AUDIO_CHANNEL_OUT_7POINT1
public static final int CHANNEL_OUT_7POINT1 = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |
CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_LOW_FREQUENCY | CHANNEL_OUT_BACK_LEFT | CHANNEL_OUT_BACK_RIGHT |
CHANNEL_OUT_FRONT_LEFT_OF_CENTER | CHANNEL_OUT_FRONT_RIGHT_OF_CENTER);
/** @hide */
// matches AUDIO_CHANNEL_OUT_7POINT1
public static final int CHANNEL_OUT_7POINT1_SURROUND = (
CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_FRONT_RIGHT |
CHANNEL_OUT_SIDE_LEFT | CHANNEL_OUT_SIDE_RIGHT |
CHANNEL_OUT_BACK_LEFT | CHANNEL_OUT_BACK_RIGHT |
CHANNEL_OUT_LOW_FREQUENCY);
// CHANNEL_OUT_ALL is not yet defined; if added then it should match AUDIO_CHANNEL_OUT_ALL
/**
* @hide
* Return the number of channels from an input channel mask
* @param mask a combination of the CHANNEL_IN_* definitions, even CHANNEL_IN_DEFAULT
* @return number of channels for the mask
*/
public static int channelCountFromInChannelMask(int mask) {
return Integer.bitCount(mask);
}
/**
* @hide
* Return the number of channels from an output channel mask
* @param mask a combination of the CHANNEL_OUT_* definitions, but not CHANNEL_OUT_DEFAULT
* @return number of channels for the mask
*/
public static int channelCountFromOutChannelMask(int mask) {
return Integer.bitCount(mask);
}
/**
* @hide
* Return a channel mask ready to be used by native code
* @param mask a combination of the CHANNEL_OUT_* definitions, but not CHANNEL_OUT_DEFAULT
* @return a native channel mask
*/
public static int convertChannelOutMaskToNativeMask(int javaMask) {
return (javaMask >> 2);
}
/**
* @hide
* Return a java output channel mask
* @param mask a native channel mask
* @return a combination of the CHANNEL_OUT_* definitions
*/
public static int convertNativeChannelMaskToOutMask(int nativeMask) {
return (nativeMask << 2);
}
public static final int CHANNEL_IN_DEFAULT = 1;
// These directly match native
public static final int CHANNEL_IN_LEFT = 0x4;
public static final int CHANNEL_IN_RIGHT = 0x8;
public static final int CHANNEL_IN_FRONT = 0x10;
public static final int CHANNEL_IN_BACK = 0x20;
public static final int CHANNEL_IN_LEFT_PROCESSED = 0x40;
public static final int CHANNEL_IN_RIGHT_PROCESSED = 0x80;
public static final int CHANNEL_IN_FRONT_PROCESSED = 0x100;
public static final int CHANNEL_IN_BACK_PROCESSED = 0x200;
public static final int CHANNEL_IN_PRESSURE = 0x400;
public static final int CHANNEL_IN_X_AXIS = 0x800;
public static final int CHANNEL_IN_Y_AXIS = 0x1000;
public static final int CHANNEL_IN_Z_AXIS = 0x2000;
public static final int CHANNEL_IN_VOICE_UPLINK = 0x4000;
public static final int CHANNEL_IN_VOICE_DNLINK = 0x8000;
public static final int CHANNEL_IN_MONO = CHANNEL_IN_FRONT;
public static final int CHANNEL_IN_STEREO = (CHANNEL_IN_LEFT | CHANNEL_IN_RIGHT);
/** @hide */
public static final int CHANNEL_IN_FRONT_BACK = CHANNEL_IN_FRONT | CHANNEL_IN_BACK;
// CHANNEL_IN_ALL is not yet defined; if added then it should match AUDIO_CHANNEL_IN_ALL
/** @hide */
public static int getBytesPerSample(int audioFormat)
{
switch (audioFormat) {
case ENCODING_PCM_8BIT:
return 1;
case ENCODING_PCM_16BIT:
case ENCODING_DEFAULT:
return 2;
case ENCODING_PCM_FLOAT:
return 4;
case ENCODING_INVALID:
default:
throw new IllegalArgumentException("Bad audio format " + audioFormat);
}
}
/** @hide */
public static boolean isValidEncoding(int audioFormat)
{
switch (audioFormat) {
case ENCODING_PCM_8BIT:
case ENCODING_PCM_16BIT:
case ENCODING_PCM_FLOAT:
case ENCODING_AC3:
case ENCODING_E_AC3:
return true;
default:
return false;
}
}
/** @hide */
public static boolean isEncodingLinearPcm(int audioFormat)
{
switch (audioFormat) {
case ENCODING_PCM_8BIT:
case ENCODING_PCM_16BIT:
case ENCODING_PCM_FLOAT:
case ENCODING_DEFAULT:
return true;
case ENCODING_AC3:
case ENCODING_E_AC3:
return false;
case ENCODING_INVALID:
default:
throw new IllegalArgumentException("Bad audio format " + audioFormat);
}
}
/** @removed */
public AudioFormat()
{
throw new UnsupportedOperationException("There is no valid usage of this constructor");
}
/**
* Private constructor with an ignored argument to differentiate from the removed default ctor
* @param ignoredArgument
*/
private AudioFormat(int ignoredArgument) {
}
/**
* Constructor used by the JNI
*/
// Update sound trigger JNI in core/jni/android_hardware_SoundTrigger.cpp when modifying this
// constructor
private AudioFormat(int encoding, int sampleRate, int channelMask) {
mEncoding = encoding;
mSampleRate = sampleRate;
mChannelMask = channelMask;
mPropertySetMask = AUDIO_FORMAT_HAS_PROPERTY_ENCODING |
AUDIO_FORMAT_HAS_PROPERTY_SAMPLE_RATE |
AUDIO_FORMAT_HAS_PROPERTY_CHANNEL_MASK;
}
/** @hide */
public final static int AUDIO_FORMAT_HAS_PROPERTY_NONE = 0x0;
/** @hide */
public final static int AUDIO_FORMAT_HAS_PROPERTY_ENCODING = 0x1 << 0;
/** @hide */
public final static int AUDIO_FORMAT_HAS_PROPERTY_SAMPLE_RATE = 0x1 << 1;
/** @hide */
public final static int AUDIO_FORMAT_HAS_PROPERTY_CHANNEL_MASK = 0x1 << 2;
private int mEncoding;
private int mSampleRate;
private int mChannelMask;
private int mPropertySetMask;
/**
* Return the encoding.
* @return one of the values that can be set in {@link Builder#setEncoding(int)} or
* {@link AudioFormat#ENCODING_INVALID} if not set.
*/
public int getEncoding() {
if ((mPropertySetMask & AUDIO_FORMAT_HAS_PROPERTY_ENCODING) == 0) {
return ENCODING_INVALID;
}
return mEncoding;
}
/**
* Return the sample rate.
* @return one of the values that can be set in {@link Builder#setSampleRate(int)} or
* 0 if not set.
*/
public int getSampleRate() {
if ((mPropertySetMask & AUDIO_FORMAT_HAS_PROPERTY_SAMPLE_RATE) == 0) {
return 0;
}
return mSampleRate;
}
/**
* Return the channel mask.
* @return one of the values that can be set in {@link Builder#setChannelMask(int)} or
* {@link AudioFormat#CHANNEL_INVALID} if not set.
*/
public int getChannelMask() {
if ((mPropertySetMask & AUDIO_FORMAT_HAS_PROPERTY_CHANNEL_MASK) == 0) {
return CHANNEL_INVALID;
}
return mChannelMask;
}
/** @hide */
public int getPropertySetMask() {
return mPropertySetMask;
}
/**
* Builder class for {@link AudioFormat} objects.
* Use this class to configure and create an AudioFormat instance. By setting format
* characteristics such as audio encoding, channel mask or sample rate, you indicate which
* of those are to vary from the default behavior on this device wherever this audio format
* is used.
* {@link AudioFormat} is for instance used in
* {@link AudioTrack#AudioTrack(AudioAttributes, AudioFormat, int, int, int)}. In this
* constructor, every format characteristic set on the Builder (e.g. with
* {@link #setSampleRate(int)}) will alter the default values used by an
* AudioTrack. In this case for audio playback with AudioTrack, the
* sample rate set in the Builder would override the platform output sample rate
* which would otherwise be selected by default.
*/
public static class Builder {
private int mEncoding = ENCODING_INVALID;
private int mSampleRate = 0;
private int mChannelMask = CHANNEL_INVALID;
private int mPropertySetMask = AUDIO_FORMAT_HAS_PROPERTY_NONE;
/**
* Constructs a new Builder with none of the format characteristics set.
*/
public Builder() {
}
/**
* Constructs a new Builder from a given {@link AudioFormat}.
* @param af the {@link AudioFormat} object whose data will be reused in the new Builder.
*/
public Builder(AudioFormat af) {
mEncoding = af.mEncoding;
mSampleRate = af.mSampleRate;
mChannelMask = af.mChannelMask;
mPropertySetMask = af.mPropertySetMask;
}
/**
* Combines all of the format characteristics that have been set and return a new
* {@link AudioFormat} object.
* @return a new {@link AudioFormat} object
*/
public AudioFormat build() {
AudioFormat af = new AudioFormat(1980/*ignored*/);
af.mEncoding = mEncoding;
af.mSampleRate = mSampleRate;
af.mChannelMask = mChannelMask;
af.mPropertySetMask = mPropertySetMask;
return af;
}
/**
* Sets the data encoding format.
* @param encoding one of {@link AudioFormat#ENCODING_DEFAULT},
* {@link AudioFormat#ENCODING_PCM_8BIT},
* {@link AudioFormat#ENCODING_PCM_16BIT},
* {@link AudioFormat#ENCODING_PCM_FLOAT},
* {@link AudioFormat#ENCODING_AC3},
* {@link AudioFormat#ENCODING_E_AC3}.
* @return the same Builder instance.
* @throws java.lang.IllegalArgumentException
*/
public Builder setEncoding(@Encoding int encoding) throws IllegalArgumentException {
switch (encoding) {
case ENCODING_DEFAULT:
mEncoding = ENCODING_PCM_16BIT;
break;
case ENCODING_PCM_8BIT:
case ENCODING_PCM_16BIT:
case ENCODING_PCM_FLOAT:
case ENCODING_AC3:
case ENCODING_E_AC3:
mEncoding = encoding;
break;
case ENCODING_INVALID:
default:
throw new IllegalArgumentException("Invalid encoding " + encoding);
}
mPropertySetMask |= AUDIO_FORMAT_HAS_PROPERTY_ENCODING;
return this;
}
/**
* Sets the channel mask.
* @param channelMask describes the configuration of the audio channels.
*
For output, the mask should be a combination of
* {@link AudioFormat#CHANNEL_OUT_FRONT_LEFT},
* {@link AudioFormat#CHANNEL_OUT_FRONT_CENTER},
* {@link AudioFormat#CHANNEL_OUT_FRONT_RIGHT},
* {@link AudioFormat#CHANNEL_OUT_SIDE_LEFT},
* {@link AudioFormat#CHANNEL_OUT_SIDE_RIGHT},
* {@link AudioFormat#CHANNEL_OUT_BACK_LEFT},
* {@link AudioFormat#CHANNEL_OUT_BACK_RIGHT}.
*
for input, the mask should be {@link AudioFormat#CHANNEL_IN_MONO} or
* {@link AudioFormat#CHANNEL_IN_STEREO}. {@link AudioFormat#CHANNEL_IN_MONO} is
* guaranteed to work on all devices.
* @return the same Builder instance.
*/
public Builder setChannelMask(int channelMask) {
// only validated when used, with input or output context
mChannelMask = channelMask;
mPropertySetMask |= AUDIO_FORMAT_HAS_PROPERTY_CHANNEL_MASK;
return this;
}
/**
* Sets the sample rate.
* @param sampleRate the sample rate expressed in Hz
* @return the same Builder instance.
* @throws java.lang.IllegalArgumentException
*/
public Builder setSampleRate(int sampleRate) throws IllegalArgumentException {
if ((sampleRate <= 0) || (sampleRate > 192000)) {
throw new IllegalArgumentException("Invalid sample rate " + sampleRate);
}
mSampleRate = sampleRate;
mPropertySetMask |= AUDIO_FORMAT_HAS_PROPERTY_SAMPLE_RATE;
return this;
}
}
@Override
public String toString () {
return new String("AudioFormat:"
+ " props=" + mPropertySetMask
+ " enc=" + mEncoding
+ " chan=0x" + Integer.toHexString(mChannelMask)
+ " rate=" + mSampleRate);
}
/** @hide */
@IntDef({
ENCODING_DEFAULT,
ENCODING_PCM_8BIT,
ENCODING_PCM_16BIT,
ENCODING_PCM_FLOAT,
ENCODING_AC3,
ENCODING_E_AC3
})
@Retention(RetentionPolicy.SOURCE)
public @interface Encoding {}
}