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a2dp: get rid of construct dependency

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This commit is contained in:
uael
2023-02-23 20:58:28 +00:00
parent d21da78aa3
commit 05200284d2
2 changed files with 45 additions and 31 deletions
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75
bumble/a2dp.py
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@@ -18,7 +18,6 @@
import struct
import logging
from collections import namedtuple
import construct
from .company_ids import COMPANY_IDENTIFIERS
from .sdp import (
@@ -258,17 +257,6 @@ class SbcMediaCodecInformation(
A2DP spec - 4.3.2 Codec Specific Information Elements
'''
BIT_FIELDS = construct.Bitwise(
construct.Sequence(
construct.BitsInteger(4),
construct.BitsInteger(4),
construct.BitsInteger(4),
construct.BitsInteger(2),
construct.BitsInteger(2),
construct.BitsInteger(8),
construct.BitsInteger(8),
)
)
SAMPLING_FREQUENCY_BITS = {16000: 1 << 3, 32000: 1 << 2, 44100: 1 << 1, 48000: 1}
CHANNEL_MODE_BITS = {
SBC_MONO_CHANNEL_MODE: 1 << 3,
@@ -284,9 +272,22 @@ class SbcMediaCodecInformation(
}
@staticmethod
def from_bytes(data):
def from_bytes(data: bytes) -> 'SbcMediaCodecInformation':
sampling_frequency = (data[0] >> 4) & 0x0F
channel_mode = (data[0] >> 0) & 0x0F
block_length = (data[1] >> 4) & 0x0F
subbands = (data[1] >> 2) & 0x03
allocation_method = (data[1] >> 0) & 0x03
minimum_bitpool_value = (data[2] >> 0) & 0xFF
maximum_bitpool_value = (data[3] >> 0) & 0xFF
return SbcMediaCodecInformation(
*SbcMediaCodecInformation.BIT_FIELDS.parse(data)
sampling_frequency,
channel_mode,
block_length,
subbands,
allocation_method,
minimum_bitpool_value,
maximum_bitpool_value,
)
@classmethod
@@ -335,8 +336,17 @@ class SbcMediaCodecInformation(
maximum_bitpool_value=maximum_bitpool_value,
)
def __bytes__(self):
return self.BIT_FIELDS.build(self)
def __bytes__(self) -> bytes:
return bytes(
[
(self.sampling_frequency << 4) | self.channel_mode,
(self.block_length << 4)
| (self.subbands << 2)
| self.allocation_method,
self.minimum_bitpool_value,
self.maximum_bitpool_value,
]
)
def __str__(self):
channel_modes = ['MONO', 'DUAL_CHANNEL', 'STEREO', 'JOINT_STEREO']
@@ -367,16 +377,6 @@ class AacMediaCodecInformation(
A2DP spec - 4.5.2 Codec Specific Information Elements
'''
BIT_FIELDS = construct.Bitwise(
construct.Sequence(
construct.BitsInteger(8),
construct.BitsInteger(12),
construct.BitsInteger(2),
construct.BitsInteger(2),
construct.BitsInteger(1),
construct.BitsInteger(23),
)
)
OBJECT_TYPE_BITS = {
MPEG_2_AAC_LC_OBJECT_TYPE: 1 << 7,
MPEG_4_AAC_LC_OBJECT_TYPE: 1 << 6,
@@ -400,9 +400,15 @@ class AacMediaCodecInformation(
CHANNELS_BITS = {1: 1 << 1, 2: 1}
@staticmethod
def from_bytes(data):
def from_bytes(data: bytes) -> 'AacMediaCodecInformation':
object_type = data[0]
sampling_frequency = (data[1] << 4) | ((data[2] >> 4) & 0x0F)
channels = (data[2] >> 2) & 0x03
rfa = 0
vbr = (data[3] >> 7) & 0x01
bitrate = ((data[3] & 0x7F) << 16) | (data[4] << 8) | data[5]
return AacMediaCodecInformation(
*AacMediaCodecInformation.BIT_FIELDS.parse(data)
object_type, sampling_frequency, channels, rfa, vbr, bitrate
)
@classmethod
@@ -430,8 +436,17 @@ class AacMediaCodecInformation(
bitrate=bitrate,
)
def __bytes__(self):
return self.BIT_FIELDS.build(self)
def __bytes__(self) -> bytes:
return bytes(
[
self.object_type & 0xFF,
(self.sampling_frequency >> 4) & 0xFF,
(((self.sampling_frequency & 0x0F) << 4) | (self.channels << 2)) & 0xFF,
((self.vbr << 7) | ((self.bitrate >> 16) & 0x7F)) & 0xFF,
((self.bitrate >> 8) & 0xFF) & 0xFF,
self.bitrate & 0xFF,
]
)
def __str__(self):
object_types = [