CAHALDeviceStream.py

from cpaudio_lib import *

from CAHALAudioFormatDescription import CAHALAudioFormatDescription

class CAHALDeviceStream:
  def __init__( self, device_stream ):
    if( type( device_stream ) is cahal_device_stream ):
      self.handle           = device_stream.handle
      self.direction        = device_stream.direction
      self.preferredFormat  = device_stream.preferred_format

      self.catalogueAudioFormats( device_stream )
    else:
      print "Device is not the correct instance: %s." %( type( device_stream ) )


  def catalogueAudioFormats( self, stream ):
    self.supportedFormats = []

    if( stream.supported_formats ):
      format_description_index  = 0
      format_description        =                 \
        cahal_audio_format_description_list_get ( \
          stream.supported_formats,               \
          format_description_index                \
                                                )

      while( format_description ):
        format = CAHALAudioFormatDescription( format_description )

        self.supportedFormats.append( format )

        format_description_index  += 1 
        format_description        =                 \
          cahal_audio_format_description_list_get ( \
            stream.supported_formats,               \
            format_description_index                \
                                                  )


  def printMe( self, indent ):
    print "%sDirection: %s"                               \
      %(                                                  \
        indent,                                           \
        "Input"                                           \
        if self.direction == CAHAL_DEVICE_INPUT_STREAM    \
        else "Output"                                     \
      )

    if( self.preferredFormat ):
      print "%sPreferred format: %s"                  \
        %(                                            \
          indent,                                     \
          cahal_convert_audio_format_id_to_cstring  ( \
            self.preferredFormat                      \
                                                    ) \
        )

    if( self.supportedFormats ):
      print "%sSupported formats:" %( indent )

      for format in self.supportedFormats:
        format.printMe( indent + '\t' )