Audio playback issue with javasound Stackoverflow example tag
Reading about javasoundearlier today I tried to implement the simple code we can see there (with some minor changes like using File
instead URL
):
File file = new File(System.getProperty("user.dir") + "/sound.wav");
Clip clip = AudioSystem.getClip();
AudioInputStream ais = AudioSystem.getAudioInputStream(file);
clip.open(ais); // exception
But I get java.lang.IllegalArgumentException: Invalid format
when I try to open AudioInputStream
which we see there.
However, when I try it with the following code I got from the internet
File file = new File(System.getProperty("user.dir") + "/sound.wav");
AudioInputStream ais = AudioSystem.getAudioInputStream(file);
AudioFormat format = ais.getFormat();
DataLine.Info info = new DataLine.Info(Clip.class, format);
Clip clip = (Clip)AudioSystem.getLine(info);
clip.open(ais);
clip.start();
works does : sound.wav
reproduces correctly, however i find it awkward for something that should be as simple as our first example given injavasound...
After reading the documentation from the clip , I have confirmed what IllegalArgumentException
is called when [...] the stream audio format is not fully specified or invalid
. However, it is indeed a valid format.
What's wrong with our first example here? AudioSystem.getAudioInputStream () takes an argument File
like, and as you can see from the second example, it does indeed have a valid audio data file because it works. Am I missing something? And, if so, should not point tojavasound tag
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After some research, it turned out that this may have something to do with the properties of the system. In these properties, you can specify default values for the getLine () methods (getLine (), getClip (), getSourceDataLine (), and getTargetDataLine ()). If you call one of these methods, Java does the following ( AudioSystem description ):
The system property javax.sound.sampled.Clip is set to
javax.sound.sampled.Clip = great.Mixer # great.clip.Clap
The Mixer class is called great.Mixer and the clip is called great.clip.Clap
When you request a clip, Java checks for the following:
- If Mixer great.Mixer is found and contains Clip great.clip.Clap then return this clip
- If Mixer great.Mixer is found but does not contain Clip great.clip.Clap then return the first clip listed in Mixer
- If Mixer great.Mixer contains no clips, or if it is not found, return the first instance of great.clip.Clap file in any Mixer
- If no Mixer contains a great.clip.Clap file, return the first clip of the first Mixer found
- If no clip is specified in any mixer then throw IllegalArgumentException
This means that if you get an IllegalArgumentException, no clips are installed in any mixers.
FROM
DataLine.Info info = new DataLine.Info(Clip.class, format);
you define a new clip. This means that your next call to the getLine () method will return this object and not give you an error.
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