PCM (pulse control modulation) is a raw (uncompressed) audio file format. It is is a digital representation of that audio wave at a specified sample rate. Its data is usually signed stereo or mono, 16-bit seems to be the most common sample size, byte ordering often is little endian. For example, signed 16-bit little-endian stereo @ 44.1kHz.
A PCM test data can be generated from a Wav file, which has some header on the top of PCM file. ffmpeg can be used for the conversion:
ffmpeg -i test.wav -f s16le -acodec pcm_s16le test.pcm
A MP3 file can be converted to a Wav file using Ogg Converter.
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