Package org.robolectric.shadows

Class ShadowAudioTrack

java.lang.Object

org.robolectric.shadows.ShadowAudioTrack

@Implements(value=android.media.AudioTrack.class,
            looseSignatures=true)
public class ShadowAudioTrack
extends Object

Implementation of a couple methods in AudioTrack. Only a couple methods are supported, other methods are expected run through the real class. The two AudioTrack.WriteMode are treated the same.

Field Summary

Fields

Modifier and Type	Field	Description
protected static int	DEFAULT_MIN_BUFFER_SIZE

Constructor Summary

Constructors

Constructor	Description
ShadowAudioTrack()

Method Summary

Modifier and Type	Method	Description
protected static int	native_get_min_buff_size(int sampleRateInHz, int channelConfig, int audioFormat)	Returns a predefined or default minimum buffer size.
protected int	native_write_byte(byte[] audioData, int offsetInBytes, int sizeInBytes, int format, boolean isBlocking)	Always return the number of bytes to write.
static void	setMinBufferSize(int bufferSize)	In the real class, the minimum buffer size is estimated from audio sample rate and other factors.
protected int	write(ByteBuffer audioData, int sizeInBytes, int writeMode)	Always return the number of bytes to write except with invalid parameters.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_MIN_BUFFER_SIZE

protected static final int DEFAULT_MIN_BUFFER_SIZE

See Also:

Constant Field Values

Constructor Detail

ShadowAudioTrack

public ShadowAudioTrack()

Method Detail

setMinBufferSize

public static void setMinBufferSize(int bufferSize)

In the real class, the minimum buffer size is estimated from audio sample rate and other factors. We do not provide such estimation in native_get_min_buff_size(int, int, int), instead letting users set the minimum for the expected audio sample. Usually higher sample rate requires bigger buffer size.

native_get_min_buff_size

@Implementation
protected static int native_get_min_buff_size(int sampleRateInHz,
                                              int channelConfig,
                                              int audioFormat)

Returns a predefined or default minimum buffer size. Audio format and config are neglected.

native_write_byte

@Implementation(minSdk=23)
protected final int native_write_byte(byte[] audioData,
                                      int offsetInBytes,
                                      int sizeInBytes,
                                      int format,
                                      boolean isBlocking)

Always return the number of bytes to write. This method returns immedidately even with AudioTrack.WRITE_BLOCKING

write

@Implementation(minSdk=21)
protected int write(@NonNull
                    ByteBuffer audioData,
                    int sizeInBytes,
                    int writeMode)

Always return the number of bytes to write except with invalid parameters. Assumes AudioTrack is already initialized (object properly created). Do not block even if AudioTrack in offload mode is in STOPPING play state. This method returns immediately even with AudioTrack.WRITE_BLOCKING