![]() Within the while loop, each chunk of retrieved data is processed in whatever way is appropriate for the application-here, it's written to a ByteArrayOutputStream. Typically, you read data from the line in a loop, as in this example. The read method returns the number of bytes that were actually read into your array. In this example, the third argument is simply the length of your byte array. The read method of TargetDataLine takes three arguments: a byte array, an offset into the array, and the number of bytes of input data that you would like to read. By using some fraction of the line's buffer size, as shown here, your application will be more successful in sharing access to the line's buffer with the mixer. If you instead make it as big as the line's buffer and try to read the entire buffer, you need to be very exact in your timing, because data will be dumped if the mixer needs to deliver data to the line while you are reading from it. Notice that in this example, the size of the byte array into which the data is read is set to be one-fifth the size of the line's buffer. NumBytesRead = line.read(data, 0, data.length) Read the next chunk of data from the TargetDataLine. Here, stopped is a global boolean set by another thread. Assume that the TargetDataLine, line, has alreadyīyteArrayOutputStream out = new ByteArrayOutputStream() īyte data = new byte The process of obtaining a target data line was described inĪccessing Audio System Resources but we repeat it here for convenience: An available method to determine how much data can be read from the buffer without blocking.A read method to get audio from the mixer. ![]() An available method to determine how much data can be written to the buffer without blocking.A write method to send audio to the mixer.Recall that the SourceDataLine interface consists of: TargetDataLine is directly analogous to the SourceDataLine interface, which was discussed extensively in The TargetDataLine interface was introduced briefly under Another scenario consists of a mixer that has no ports but instead gets its audio input over a network. One or more target data lines, from which an application can retrieve the data.Ĭommonly, only one input port can be open at a time, but an audio-input mixer that mixes audio from multiple ports is also possible.A mixer, which places the input data in:.An input port, such as a microphone port or a line-in port, which feeds its incoming audio data into:.Overview of the Sampled Package, a typical audio-input system in an implementation of the Java Sound API consists of: Instead it might do something with the data as it's coming in - such as transcribe speech into text - but then discard each buffer of audio as soon as it's finished with that buffer. An application that captures audio doesn't necessarily store the audio. However, capturing isn't synonymous with recording, because recording implies that the application always saves the sound data that's coming in. ![]() A common application of audio capture is recording, such as recording the microphone input to a sound file. Capturing refers to the process of obtaining a signal from outside the computer.
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