Audio files handling in Java – javax.sound.sampled.AudioSystem
Problem: Few days before i wrote a post about converting audio media file to different format using SoX. I also mentioned one limitation of Sox that it does not convert audio file formats and resample it when rates are same in input and output and gives following error:
sox: Input and Output rates must be different to use resample effect
See the solution in the post but that will suit you if you are using Sox manually.
Solution: While using java, You first need to know about specs of audio file before converting it or applying some effects. javax.sound.sampled package solves this problem, which i figured out while solving the problem:
AudioFileFormat format = AudioSystem.getAudioFileFormat(mediaFileToConvert);
Once you get AudioFileFormat from the File, you can get get different specs of Audio file:
AudioFormat audioformat = format.getFormat(); /* returns int - Obtains the number of channels.*/ audioformat.getChannels(); /* returns AudioFormat.Encoding - Obtains the type of encoding for sounds in this format.*/ audioformat.getEncoding(); /* returns float Obtains the frame rate in frames per second.*/ audioformat .getFrameRate(); /* returns int Obtains the frame size in bytes. */ audioformat .getFrameSize(); /* returns Object Obtain the property value specified by the key. */ audioformat.getProperty(String key); /* returns float Obtains the sample rate.*/ audioformat.getSampleRate(); /* returns int Obtains the size of a sample. */ audioformat.getSampleSizeInBits() /* returns boolean Indicates whether the audio data is stored in big-endian or little-endian byte order. */ audioformat.isBigEndian();
I have noted down very basic use of AudioSystem , I will look more and will write about mixing and conversion using Java soon.
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