Fix wav format pcm encoding detection error

[loliball]

Problem

I exported some long-duration audio files in wav format from Adobe Audition, but there was a harsh noise when played on exoplayer.

Root Cause

WavExtractor#readFormat ignores GUIDs declared in fmt blocks when making PCM format selections.
Only integer bit depths are considered when TYPE_WAVE_FORMAT_EXTENSIBLE (0xFFFE) is detected.

Solution

Parse WavFormat.extraData to get GUID to determine PCM data type, add missing ENCODING_PCM_FLOAT AUDIO_MLAW AUDIO_ALAW.

Links

• There is noise when playing compressed format wav file. (Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 5.1, flt) google/ExoPlayer#10953
• https://www.mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
• https://learn.microsoft.com/en-us/windows-hardware/drivers/audio/subformat-guids-for-compressed-audio-formats