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Formatting, refactoring, __repr__

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This commit is contained in:
Elijah Lopez
2020-08-14 09:07:56 -04:00
parent 7351623e3a
commit add390c0a0
9 changed files with 85 additions and 97 deletions
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29
wavinfo/wave_bext_reader.py
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@@ -2,12 +2,13 @@ import struct
import binascii
from .umid_parser import UMIDParser
class WavBextReader:
def __init__(self, bext_data, encoding):
"""
Read Broadcast-WAV extended metadata.
:param best_data: The bytes-like data.
"param encoding: The encoding to use when decoding the text fields of the
:param bext_data: The bytes-like data.
:param encoding: The encoding to use when decoding the text fields of the
BEXT metadata scope. According to EBU Rec 3285 this shall be ASCII.
"""
packstring = "<256s" + "32s" + "32s" + "10s" + "8s" + "QH" + "64s" + "hhhhh" + "180s"
@@ -15,33 +16,29 @@ class WavBextReader:
rest_starts = struct.calcsize(packstring)
unpacked = struct.unpack(packstring, bext_data[:rest_starts])
def sanatize_bytes(bytes):
first_null = next((index for index, byte in enumerate(bytes) if byte == 0), None)
if first_null is not None:
trimmed = bytes[:first_null]
else:
trimmed = bytes
def sanitize_bytes(b):
first_null = next((index for index, byte in enumerate(b) if byte == 0), None)
trimmed = b if first_null is None else b[:first_null]
decoded = trimmed.decode(encoding)
return decoded
#: Description. A free-text field up to 256 characters long.
self.description = sanatize_bytes(unpacked[0])
self.description = sanitize_bytes(unpacked[0])
#: Originator. Usually the name of the encoding application, sometimes
#: a artist name.
self.originator = sanatize_bytes(unpacked[1])
#: A unique identifer for the file, a serial number.
self.originator_ref = sanatize_bytes(unpacked[2])
self.originator = sanitize_bytes(unpacked[1])
#: A unique identifier for the file, a serial number.
self.originator_ref = sanitize_bytes(unpacked[2])
#: Date of the recording, in the format YYY-MM-DD
self.originator_date = sanatize_bytes(unpacked[3])
self.originator_date = sanitize_bytes(unpacked[3])
#: Time of the recording, in the format HH:MM:SS.
self.originator_time = sanatize_bytes(unpacked[4])
self.originator_time = sanitize_bytes(unpacked[4])
#: The sample offset of the start of the file relative to an
#: epoch, usually midnight the day of the recording.
self.time_reference = unpacked[5]
#: A variable-length text field containing a list of processes and
#: and conversions performed on the file.
self.coding_history = sanatize_bytes(bext_data[rest_starts:])
self.coding_history = sanitize_bytes(bext_data[rest_starts:])
#: BEXT version.
self.version = unpacked[6]
#: SMPTE 330M UMID of this audio file, 64 bytes are allocated though the UMID