How to read and write audio file in java

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How to read and write audio file in java

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Using Files and Format Converters

Contact Details. Site Map. This site uses Google Analytics to track visits. Privacy Statement. Download Files WavFile. This page describes an easy to use Java class for handling the reading and writing of Wav files. The WavFile class takes care of all the file IO for reading and writing audio data to and from wave files.

The WavFile class provides methods for accessing wav file data using different java primitive types, these are longint and double. It is up to the user to choose the correct type for the given wav file's sample resolution. The standard wav file resolutions are shown in the table below. For all resolutions, up to 32 bit unsigned, handling samples using the int type is fine. For greater resolutions, the long type should be used.

The WavFile class assumes all samples of resolution 8 bits and less are unsigned, all resolutions over 8 bits are signed this is the seems to be the standard for wav files. The double type can be used for any wav file data resolution. The WavFile class will automatically scale sample values to and from the Due to the scaling process, reading wav files as doubles then writing them back out can result in changes in some sample values.

This process is illustrated in the image below. Signed integers encoded using two's complement have different maximum magnitudes for positive and negative numbers. For example a signed 16 bit value has a range ofto 32, When scaling from integer to double, the maximum negative magnitude must be used to ensure that no sample has a value less than When scaling from a double to an integer, the positive magnitude is used to ensure the integer range is not exceeded.

The image below illustrates the structure of the section storing audio data found within a wav file. In this case, there are 3 audio channels. The resolution is 14 bits so two bytes are required to store each sample.

Therefore, each frame requires 6 bytes, this is termed the 'Block Align'. The code below is an example of how to read a wav file.Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. Most application programs that deal with sound need to read sound files or audio streams. This is common functionality, regardless of what the program may subsequently do with the data it reads such as play, mix, or process it.

Similarly, many programs need to write sound files or streams. In some cases, the data that has been read or that will be written needs to be converted to a different format. Application programs can read, write, and translate between a variety of sound file formats and audio data formats.

Overview of the Sampled Package introduced the main classes related to sound files and audio data formats. As a review:. This format specifies how the audio samples themselves are arranged, but not the structure of a file that they might be stored in. In other words, an AudioFormat describes "raw" audio data, such as the system might hand your program after capturing it from a microphone input or after parsing it from a sound file.

An AudioFormat includes such information as the encoding, the byte order, the number of channels, the sampling rate, and the number of bits per sample. It might support only the most common data and file formats. However, service providers can develop and distribute conversion services that extend this set, as you'll later see in Providing Sampled-Audio Services.

The AudioSystem class supplies methods that allow application programs to learn what conversions are available, as described later under Converting File and Data Formats. The AudioSystem class provides two types of file-reading services:. The first of these is given by three variants of the getAudioFileFormat method:. As mentioned above, the returned AudioFileFormat object tells you the file type, the length of the data in the file, encoding, the byte order, the number of channels, the sampling rate, and the number of bits per sample.

The second type of file-reading functionality is given by these AudioSystem methods. These methods give you an object an AudioInputStream that lets you read the file's audio data, using one of the read methods of AudioInputStream. We'll see an example momentarily. Suppose you're writing a sound-editing application that allows the user to load sound data from a file, display a corresponding waveform or spectrogram, edit the sound, play back the edited data, and save the result in a new file.

Or perhaps your program will read the data stored in a file, apply some kind of signal processing such as an algorithm that slows the sound down without changing its pitchand then play the processed audio. In either case, you need to get access to the data contained in the audio file. Assuming that your program provides some means for the user to select or specify an input sound file, reading that file's audio data involves three steps:.

Let's take a look at what's happening in the above code sample.

how to read and write audio file in java

First, the outer try clause instantiates an AudioInputStream object through the call to the AudioSystem. This method transparently performs all of the testing required to determine whether the specified file is actually a sound file of a type that is supported by the Java Sound API.

If the file being inspected fileIn in this example is not a sound file, or is a sound file of some unsupported type, an UnsupportedAudioFileException exception is thrown.

This behavior is convenient, in that the application programmer need not be bothered with testing file attributes, nor with adhering to any file-naming conventions. Instead, the getAudioInputStream method takes care of all the low-level parsing and verification that is required to validate the input file. The outer try clause then creates a byte array, audioBytesof an arbitrary fixed length.

We make sure that its length in bytes equals an integral number of frames, so that we won't end up reading only part of a frame or, even worse, only part of a sample. This byte array will serve as a buffer to temporarily hold a chunk of audio data as it's read from the stream. If we knew we would be reading nothing but very short sound files, we could make this array the same length as the data in the file, by deriving the length in bytes from the length in frames, as returned by AudioInputStream's getFrameLength method.

Actually, we'd probably just use a Clip object instead. But to avoid running out of memory in the general case, we instead read the file in chunks, one buffer at a time. The inner try clause contains a while loop, which is where we read the audio data from the AudioInputStream into the byte array. You should add code in this loop to handle the audio data in this array in whatever way is appropriate for your program's needs.

If you're applying some kind of signal processing to the data, you'll probably need to query the AudioInputStream's AudioFormat further, to learn the number of bits per sample and so on.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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In a Java program, what is the best way to read an audio file WAV file to an array of numbers float[]short[]The following snippet from the Java Sound Tutorials works well. To write a WAV, I found that quite tricky. On the surface it seems like a circular problem, the command that writes relies on an AudioInputStream as a parameter. But how do you write bytes to an AudioInputStream?

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Shouldn't there be an AudioOutputStream? What I found was that one can define an object that has access to the raw audio byte data to implement TargetDataLine. This requires a lot of methods be implemented, but most can stay in dummy form as they are not required for writing data to a file. The key method to implement is read byte[] buffer, int bufferoffset, int numberofbytestoread.

As this method will probably be called multiple times, there should also be an instance variable that indicates how far through the data one has progressed, and update that as part of the above read method. When you have implemented this method, then your object can be used in to create a new AudioInputStream which in turn can be used with:.

As to the direct manipulating the data, I have had good success acting on the data in the buffer in the innermost loop of the snippet example above, audioBytes. While you are in that inner loop, you can convert the bytes to integers or floats and multiply a volume value ranging from 0. I believe since you have access to a series of samples in that buffer you can also engage various forms of DSP filtering algorithms at that stage.

In my experience I have found that it is better to do volume changes directly on data in this buffer because then you can make the smallest possible increment: one delta per sample, minimizing the chance of clicks due to volume-induced discontinuities.

How to play an Audio file using Java

I find the "control lines" for volume provided by Java tend to situations where the jumps in volume will cause clicks, and I believe this is because the deltas are only implemented at the granularity of a single buffer read often in the range of one change per samples rather than dividing the change into smaller pieces and adding them one per sample.

But I'm not privy to how the Volume Controls were implemented, so please take that conjecture with a grain of salt. All and all, Java.The following tutorial reads the header and samples of a WAV audio file into a Java object, writes that Java object back out to a different WAV file, and then compares the contents of the two files to make sure they match.

Hey, not every program can be a soul-elevating intellectual delight. If you have not already done so, download and install the Java Development Kit. Details are given in a previous tutorial. In the indicated places, substitute the path of the directory containing javac. If everything works as expected, the two files should be identical.

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how to read and write audio file in java

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how to read and write audio file in java

Home About. In any convenient location, create a new directory named WavFormatTest. BitsPerByte ; writer.

Java Serializable interface: Reading and writing Objects to a file Tutorial

Hopefully some of these possibilities may be explored in a future tutorial. Also, Java lacks unsigned types. Just be cool. This program has really only been tested on tada. This is to say nothing of the difficulties that might be introduced due to encoded data or discrepancies between floating-point and integer-based samples. In summary, you may have to use your gumption. I apologize for the inconvenience.

Share this: Reddit. Like this: Like LoadingExamples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. This page discusses the details of reading, writing, creating, and opening files. On the far left of the diagram are the utility methods readAllBytesreadAllLinesand the write methods, designed for simple, common cases. To the right of those are the methods used to iterate over a stream or lines of text, such as newBufferedReadernewBufferedWriterthen newInputStream and newOutputStream.

These methods are interoperable with the java. Several of the methods in this section take an optional OpenOptions parameter. This parameter is optional and the API tells you what the default behavior is for the method when none is specified. If you have a small-ish file and you would like to read its entire contents in one pass, you can use the readAllBytes Path or readAllLines Path, Charset method.

These methods take care of most of the work for you, such as opening and closing the stream, but are not intended for handling large files. The following code shows how to use the readAllBytes method:. The java. The newBufferedReader Path, Charset method opens a file for reading, returning a BufferedReader that can be used to read text from a file in an efficient manner. The following code snippet shows how to use the newBufferedReader method to read from a file. This method returns an unbuffered input stream for reading bytes from the file.

You can create a file, append to a file, or write to a file by using the newOutputStream Path, OpenOption This method opens or creates a file for writing bytes and returns an unbuffered output stream.

The method takes an optional OpenOption parameter. If no open options are specified, and the file does not exist, a new file is created. If the file exists, it is truncated. The following example opens a log file. If the file does not exist, it is created. If the file exists, it is opened for appending. The ByteChannel interface provides basic read and write functionality.

A SeekableByteChannel is a ByteChannel that has the capability to maintain a position in the channel and to change that position. A SeekableByteChannel also supports truncating the file associated with the channel and querying the file for its size.

The capability to move to different points in the file and then read from or write to that location makes random access of a file possible.In modern Java applications you typically use the java.

Java will read all input as a stream of bytes. The InputStream class is the superclass of all classes representing an input stream of bytes.

To read a text file you can use the Files. The usage of this method is demonstrated in the following listing.

how to read and write audio file in java

To read a text file line by line into a List of type String structure you can use the Files. It also ensures that file is closed after all bytes are read or in case an exception occurred. The Files. This stream can be filtered and mapped.

In the following example unnecessary whitespace at the end of each line is removed and empty lines are filterer. It removes the prefix and removes all leading and trailing whitespace. You can access files relative to the current execution directory of your Java program.

To access the current directory in which your Java program is running, you can use the following statement. Create a new Java project called com.

Create the following FilesUtil. To test these methods, create a text file called file.

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Create the following Main class and run it. You can read resources from your project or your jar file via the. Free use of the software examples is granted under the terms of the Eclipse Public License 2. Java Input Output. This tutorial explains how to read and write files via Java. Overview In modern Java applications you typically use the java. Reading a file in Java To read a text file you can use the Files. IOException ; import java. Files ; import java.

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Reading and filtering line by line The Files. The next example demonstrates how to filter out lines based on a certain regular expression. Paths ; import java. Optional ; import java. Writing a file in Java To write a file you can use the following method:. List all files and sub-directories using Files.The java. All these streams represent an input source and an output destination. The stream in the java. Java byte streams are used to perform input and output of 8-bit bytes.

Though there are many classes related to byte streams but the most frequently used classes are, FileInputStream and FileOutputStream. As a next step, compile the above program and execute it, which will result in creating output.

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So let's put the above code in CopyFile. Java Byte streams are used to perform input and output of 8-bit bytes, whereas Java Character streams are used to perform input and output for bit unicode.

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Though there are many classes related to character streams but the most frequently used classes are, FileReader and FileWriter. Let's keep the above code in ReadConsole. As described earlier, a stream can be defined as a sequence of data. The InputStream is used to read data from a source and the OutputStream is used for writing data to a destination. This stream is used for reading data from the files.

Objects can be created using the keyword new and there are several types of constructors available.

Java - Files and I/O

Following constructor takes a file object to create an input stream object to read the file. Once you have InputStream object in hand, then there is a list of helper methods which can be used to read to stream or to do other operations on the stream.

This method closes the file output stream. Releases any system resources associated with the file. Throws an IOException. This method cleans up the connection to the file. Ensures that the close method of this file output stream is called when there are no more references to this stream. This method reads the specified byte of data from the InputStream. Returns an int. Returns the next byte of data and -1 will be returned if it's the end of the file. This method reads r. Returns the total number of bytes read.

If it is the end of the file, -1 will be returned. FileOutputStream is used to create a file and write data into it. The stream would create a file, if it doesn't already exist, before opening it for output. Following constructor takes a file object to create an output stream object to write the file. Once you have OutputStream object in hand, then there is a list of helper methods, which can be used to write to stream or to do other operations on the stream.

The above code would create file test.


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