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# The MIT License (MIT)
#
# Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import struct
from . import standard
"""
Audio specific descriptors
================================
* Author(s): Scott Shawcroft
"""
ENDPOINT_DESCRIPTOR_SUBTYPE_UNDEFINED = 0x00
ENDPOINT_DESCRIPTOR_SUBTYPE_GENERAL = 0x01
JACK_TYPE_UNDEFINED = 0x00
JACK_TYPE_EMBEDDED = 0x01
JACK_TYPE_EXTERNAL = 0x02
class Header:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_INTERFACE
bDescriptorSubtype = 0x01
fmt = "<BBB" + "HH"
bLength = struct.calcsize(fmt)
def __init__(self, *, jacks_and_elements=[]):
self.jacks_and_elements = jacks_and_elements
def notes(self):
notes = [str(self)]
for jack in self.jacks_and_elements:
notes.extend(jack.notes())
return notes
def __bytes__(self):
for i, element in enumerate(self.jacks_and_elements):
element.id = i + 1
jacks_and_elements_encoded = b''.join(map(bytes, self.jacks_and_elements))
header_encoded = struct.pack(self.fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
0x0100,
self.bLength + len(jacks_and_elements_encoded))
return header_encoded + jacks_and_elements_encoded
class InJackDescriptor:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_INTERFACE
bDescriptorSubtype = 0x02
fmt = "<BBB" + "BBB"
bLength = struct.calcsize(fmt)
def __init__(self, *,
description,
bJackType,
iJack=0):
self.description = description
self.id = 0 # auto assigned by the parent midi.Header
self.bJackType = bJackType
self.iJack = iJack
def notes(self):
return [str(self)]
def __bytes__(self):
return struct.pack(self.fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
self.bJackType,
self.id,
self.iJack)
class OutJackDescriptor:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_INTERFACE
bDescriptorSubtype = 0x03
fixed_fmt = "<BBB" + "BBB" # not including pin list
fixed_bLength = struct.calcsize(fixed_fmt)
def __init__(self, *,
description,
bJackType,
input_pins=[],
iJack=0):
self.description = description
self.id = 0 # auto assigned by the parent midi.Header
self.bJackType = bJackType
self.iJack = iJack
self.input_pins = input_pins
@property
def bLength(self):
return self.fixed_bLength + len(self.input_pins) * 2 + 1
def notes(self):
return [str(self)]
def __bytes__(self):
input_pins = bytearray(len(self.input_pins) * 2)
for i, input_pin in enumerate(self.input_pins):
element, pin_number = input_pin
input_pins[2 * i] = element.id
input_pins[2 * i + 1] = pin_number
return struct.pack(self.fixed_fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
self.bJackType,
self.id,
len(self.input_pins)) + input_pins + bytes([self.iJack])
class ElementDescriptor:
bDescriptorSubtype = 0x04
def notes(self):
return [str(self)]
class DataEndpointDescriptor:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_ENDPOINT
bDescriptorSubtype = ENDPOINT_DESCRIPTOR_SUBTYPE_GENERAL
fixed_fmt = "<BBB" + "B" # not including jack list
fixed_bLength = struct.calcsize(fixed_fmt)
def __init__(self, *,
baAssocJack=[]):
self.baAssocJack = baAssocJack
@property
def bLength(self):
return self.fixed_bLength + len(self.baAssocJack)
def notes(self):
return [str(self)]
def __bytes__(self):
baAssocJack = bytes([x.id for x in self.baAssocJack])
return struct.pack(self.fixed_fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
len(self.baAssocJack)) + baAssocJack
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