Media Types
-----------

 audio/x-raw

  format, G_TYPE_STRING, mandatory
   The format of the audio samples, see the Formats section for a list
   of valid sample formats.

  rate, G_TYPE_INT, mandatory
   The samplerate of the audio

  channels, G_TYPE_INT, mandatory
   The number of channels

  channel-positions, G_TYPE_VALUE_ARRAY
   An array with a channel position for each channel. The number of items in
   this array must be the same as the channels property.


Metadata
--------

 "GstAudioDownmixMeta"
   A matrix for downmixing multichannel audio to a lower numer of channels.
   

Formats
-------

 The following values can be used for the format string property.

  "S8" 8-bit signed PCM audio
  "U8" 8-bit unsigned PCM audio

  "S16LE" 16-bit signed PCM audio
  "S16BE" 16-bit signed PCM audio
  "U16LE" 16-bit unsigned PCM audio
  "U16BE" 16-bit unsigned PCM audio

  "S24_32LE" 24-bit signed PCM audio
  "S24_32BE" 24-bit signed PCM audio
  "U24_32LE" 24-bit unsigned PCM audio
  "U24_32BE" 24-bit unsigned PCM audio

  "S32LE" 32-bit signed PCM audio
  "S32BE" 32-bit signed PCM audio
  "U32LE" 32-bit unsigned PCM audio
  "U32BE" 32-bit unsigned PCM audio

  "S24LE" 24-bit signed PCM audio
  "S24BE" 24-bit signed PCM audio
  "U24LE" 24-bit unsigned PCM audio
  "U24BE" 24-bit unsigned PCM audio

  "S20LE" 20-bit signed PCM audio
  "S20BE" 20-bit signed PCM audio
  "U20LE" 20-bit unsigned PCM audio
  "U20BE" 20-bit unsigned PCM audio

  "S18LE" 18-bit signed PCM audio
  "S18BE" 18-bit signed PCM audio
  "U18LE" 18-bit unsigned PCM audio
  "U18BE" 18-bit unsigned PCM audio

  "F32LE" 32-bit floating-point audio
  "F32BE" 32-bit floating-point audio
  "F64LE" 64-bit floating-point audio
  "F64BE" 64-bit floating-point audio


