[LAD] How do I write meta data into a wave file? (Command line tools?)

Hello list,

libsndfile-info shows various useful information like the one at the end of this mail.
I have Sonatina Symphonic Orchestra waves here (violins 1) and a one note wave includes "Midi Note", "Loop Count" and "Cue Start : 92078 End : 223977", which is the actual loop start/end

Is this custom data or does it follow a standard?
And no matter what, how do I write that into my own wave files?

I would prefer command line tools. But programming interfaces are fine as well.

Greetings,
Nils

$ sndfile-info test.wav

Version : libsndfile-1.0.25

========================================
File : test.wav
Length : 896548
RIFF : 896540
WAVE
fmt : 16
  Format : 0x1 => WAVE_FORMAT_PCM
  Channels : 2
  Sample Rate : 44100
  Block Align : 4
  Bit Width : 16
  Bytes/sec : 176400
data : 895916
*** SAUR : 512 (unknown marker)
smpl : 60
  Manufacturer : 0
  Product : 0
  Period : 22675 nsec
  Midi Note : 76
  Pitch Fract. : 0
  SMPTE Format : 0
  SMPTE Offset : 00:00:00 00
  Loop Count : 1
    Cue ID : 0 Type : 0 Start : 92078 End : 223977 Fraction : 0 Count : 0
  Sampler Data : 0
End

----------------------------------------
Sample Rate : 44100
Frames : 223979
Channels : 2
Format : 0x00010002
Sections : 1
Seekable : TRUE
Duration : 00:00:05.079
Signal Max : 31468 (-0.35 dB)

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Received on Sat May 4 04:15:02 2013