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python-usb-protocol/usb_protocol/emitters/descriptors/uac2.py

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  1. #

  2. # This file is part of usb_protocol.

  3. #

  4. """ Convenience emitters for USB Audio Class 2 descriptors. """

  5. 

  6. from contextlib import contextmanager

  7. 

  8. from .. import emitter_for_format

  9. from ...types.descriptors.uac2 import *

  10. from ...emitters.descriptor    import ComplexDescriptorEmitter

  11. 

  12. # Create our emitters.

  13. InterfaceAssociationDescriptorEmitter          = emitter_for_format(InterfaceAssociationDescriptor)

  14. StandardAudioControlInterfaceDescriptorEmitter = emitter_for_format(StandardAudioControlInterfaceDescriptor)

  15. 

  16. class ClassSpecificAudioControlInterfaceDescriptorEmitter(ComplexDescriptorEmitter):

  17.     DESCRIPTOR_FORMAT = ClassSpecificAudioControlInterfaceDescriptor

  18. 

  19.     def _pre_emit(self):

  20.         # Figure out the total length of our descriptor, including subordinates.

  21.         subordinate_length = sum(len(sub) for sub in self._subordinates)

  22.         self.wTotalLength = subordinate_length + self.DESCRIPTOR_FORMAT.sizeof()

  23. 

  24. ClockSourceDescriptorEmitter                                             = emitter_for_format(ClockSourceDescriptor)

  25. InputTerminalDescriptorEmitter                                           = emitter_for_format(InputTerminalDescriptor)

  26. OutputTerminalDescriptorEmitter                                          = emitter_for_format(OutputTerminalDescriptor)

  27. FeatureUnitDescriptorEmitter                                             = emitter_for_format(FeatureUnitDescriptor)

  28. AudioStreamingInterfaceDescriptorEmitter                                 = emitter_for_format(AudioStreamingInterfaceDescriptor)

  29. ClassSpecificAudioStreamingInterfaceDescriptorEmitter                    = emitter_for_format(ClassSpecificAudioStreamingInterfaceDescriptor)

  30. TypeIFormatTypeDescriptorEmitter                                         = emitter_for_format(TypeIFormatTypeDescriptor)

  31. ExtendedTypeIFormatTypeDescriptorEmitter                                 = emitter_for_format(ExtendedTypeIFormatTypeDescriptor)

  32. TypeIIFormatTypeDescriptorEmitter                                        = emitter_for_format(TypeIIFormatTypeDescriptor)

  33. ExtendedTypeIIFormatTypeDescriptorEmitter                                = emitter_for_format(ExtendedTypeIIFormatTypeDescriptor)

  34. TypeIIIFormatTypeDescriptorEmitter                                       = emitter_for_format(TypeIIIFormatTypeDescriptor)

  35. ExtendedTypeIIIFormatTypeDescriptorEmitter                               = emitter_for_format(ExtendedTypeIIIFormatTypeDescriptor)

  36. ClassSpecificAudioStreamingIsochronousAudioDataEndpointDescriptorEmitter = emitter_for_format(ClassSpecificAudioStreamingIsochronousAudioDataEndpointDescriptor)

  37. AudioControlInterruptEndpointDescriptorEmitter                           = emitter_for_format(AudioControlInterruptEndpointDescriptor)

  38. AudioStreamingIsochronousEndpointDescriptorEmitter                       = emitter_for_format(AudioStreamingIsochronousEndpointDescriptor)

  39. AudioStreamingIsochronousFeedbackEndpointDescriptorEmitter               = emitter_for_format(AudioStreamingIsochronousFeedbackEndpointDescriptor)