Package ipsk.audio.dsp

Class AudioFrameProcessor

java.lang.Object

ipsk.audio.dsp.AudioSampleProcessor

ipsk.audio.dsp.AudioFrameProcessor

Direct Known Subclasses:

AudioBufferProcessor, PeakDetector

public class AudioFrameProcessor
extends AudioSampleProcessor

Calculates amplitude values for an audio frame. An audio frame contains the samples for all channels.

Author:

K.Jaensch, klausj@phonetik.uni-muenchen.de

Field Summary

Fields inherited from class ipsk.audio.dsp.AudioSampleProcessor

ae, af, AUDITORY_THRESHOLD, bigEndian, channels, DEFAULT_0DB_SOUND_PRESSURE, frameSize, maxValue, minValue, pp, resolutionBits, sampleSize, signed

Constructor Summary

Constructors

Constructor	Description
AudioFrameProcessor(javax.sound.sampled.AudioFormat af)	Create a frame processor.

Method Summary

Modifier and Type	Method	Description
void	encode(double[][] values, int srcOffset, byte[] buf, int offset, int frames)	Encode normalized double values to byte buffer.
void	encode(double[] values, int srcOffset, byte[] buf, int offset, int samples)	Encode normalized double values to byte buffer.
void	encodeToFloatValues(float[] values, byte[] buf, int offset)	Encode one frame of normalized float values to byte buffer.
void	encodeValues(double[] values, byte[] buf, int offset)	Encode one frame of normalized double values to byte buffer.
void	encodeValues(float[] values, byte[] buf, int offset)	Encode one frame of normalized float values to byte buffer.
void	getDoubleValues(byte[] frameData, int offset, double[] buffer)	Converts to normalized double values (amplitudes) of the given data.
float[]	getFloatValues(byte[] frameData)	Returns the normalized float values (amplitudes) of the given frame.
float[]	getFloatValues(byte[] frameData, int offset)	Returns the normalized float values (amplitudes) of the given data.
void	getFloatValues(byte[] frameData, int offset, float[] buffer)	Converts to normalized float values (amplitudes) of the given data.
void	getNormalizedInterleavedValues(byte[] frameData, int frames, double[][] normBuffer, int normBufferFrameOffset)	Converts PCM coded data to normalized double values (amplitudes).
void	getNormalizedInterleavedValues(byte[] frameData, int frameDataOffset, int frames, double[][] normBuffer, int normBufferFrameOffset)	Converts PCM coded data to normalized double values (amplitudes).
void	getNormalizedValues(byte[] frameData, int offset, double[] normBuffer)	Converts to normalized float values (amplitudes) of the given data.

Methods inherited from class ipsk.audio.dsp.AudioSampleProcessor

amplitudeToSoundPressure, encodeValue, getChannels, getDoubleValue, getEncodedValue, getFloatValue, getFloatValue, getFrameSize, getNormalizedValue, getNormalizedValue, getSampleSize, setAudioFormat

Methods inherited from class java.lang.Object

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

Constructor Detail

AudioFrameProcessor

public AudioFrameProcessor(javax.sound.sampled.AudioFormat af)
                    throws AudioFormatNotSupportedException

Create a frame processor.

Parameters:

af - frame must have this audio format

Throws:

AudioFormatNotSupportedException

Method Detail

getFloatValues

public float[] getFloatValues(byte[] frameData)

Returns the normalized float values (amplitudes) of the given frame.

Parameters:

frameData - PCM coded data array

Returns:

values (range -0.5 ... +0.5)

getFloatValues

public float[] getFloatValues(byte[] frameData,
                              int offset)

Returns the normalized float values (amplitudes) of the given data.

Parameters:

frameData - PCM coded data array

offset - offset in the data

Returns:

values (range -0.5 ... +0.5)

getNormalizedInterleavedValues

public void getNormalizedInterleavedValues(byte[] frameData,
                                           int frames,
                                           double[][] normBuffer,
                                           int normBufferFrameOffset)

Converts PCM coded data to normalized double values (amplitudes).

Parameters:

frameData - PCM coded data array

frames - count of frames to process

normBuffer - buffer for normalized audio data (value range -1.0 ... +1.0)

normBufferFrameOffset - offset in frames from where to write converted values

getNormalizedInterleavedValues

public void getNormalizedInterleavedValues(byte[] frameData,
                                           int frameDataOffset,
                                           int frames,
                                           double[][] normBuffer,
                                           int normBufferFrameOffset)

Converts PCM coded data to normalized double values (amplitudes).

Parameters:

frameData - PCM coded data array

frameDataOffset - offset in frameData

frames - count of frames to process

normBuffer - buffer for normalized audio data (value range -1.0 ... +1.0)

normBufferFrameOffset - offset in frames from where to write converted values

getNormalizedValues

public void getNormalizedValues(byte[] frameData,
                                int offset,
                                double[] normBuffer)

Converts to normalized float values (amplitudes) of the given data.

Parameters:

frameData - PCM coded data array

offset - offset (of bytes) in PCM input data

normBuffer - buffer for normalized audio data (value range -1.0 ... +1.0)

getDoubleValues

public void getDoubleValues(byte[] frameData,
                            int offset,
                            double[] buffer)

Converts to normalized double values (amplitudes) of the given data.

Parameters:

frameData - PCM coded data array

offset - offset (of bytes) in PCM input data

buffer - buffer for audio data values (range -0.5 ... +0.5)

getFloatValues

public void getFloatValues(byte[] frameData,
                           int offset,
                           float[] buffer)

Converts to normalized float values (amplitudes) of the given data.

Parameters:

frameData - PCM coded data array

offset - offset (of bytes) in PCM input data

buffer - buffer for audio data values (range -0.5 ... +0.5)

encodeToFloatValues

public void encodeToFloatValues(float[] values,
                                byte[] buf,
                                int offset)

Encode one frame of normalized float values to byte buffer.

Parameters:

values - float values for all channels

buf - the buffer

offset - bufPos in the buffer

encodeValues

public void encodeValues(float[] values,
                         byte[] buf,
                         int offset)

Encode one frame of normalized float values to byte buffer.

Parameters:

values - float values for all channels

buf - the buffer

offset - bufPos in the buffer

encodeValues

public void encodeValues(double[] values,
                         byte[] buf,
                         int offset)

Encode one frame of normalized double values to byte buffer.

Parameters:

values - double values for all channels

buf - the buffer

offset - bufPos in the buffer

encode

public void encode(double[][] values,
                   int srcOffset,
                   byte[] buf,
                   int offset,
                   int frames)

Encode normalized double values to byte buffer.

Parameters:

values - double values for all channels

buf - the buffer

offset - bufPos in the buffer

encode

public void encode(double[] values,
                   int srcOffset,
                   byte[] buf,
                   int offset,
                   int samples)

Encode normalized double values to byte buffer.

Parameters:

values - double values (one value per sample)

srcOffset - offset in the source buffer

buf - the buffer

offset - offset in the target byte buffer

samples - sample count to convert