mirror of
https://github.com/iluvcapra/wavinfo.git
synced 2025-12-31 08:50:41 +00:00
56 lines
1.2 KiB
Python
56 lines
1.2 KiB
Python
"""
|
|
ADM Reader
|
|
"""
|
|
|
|
from struct import unpack, unpack_from, calcsize
|
|
from dataclasses import dataclass
|
|
from io import BytesIO
|
|
|
|
from lxml import etree as ET
|
|
|
|
@dataclass
|
|
class ChannelEntry:
|
|
"""
|
|
A `chna` chunk table entry.
|
|
"""
|
|
|
|
track_index: int
|
|
"Track index (indexed from 1)"
|
|
|
|
uid: str
|
|
"audioTrackUID"
|
|
|
|
track_ref: str
|
|
"audioTrackFormatID"
|
|
|
|
pack_ref: str
|
|
"audioPackFormatID"
|
|
|
|
|
|
class WavADMReader:
|
|
"""
|
|
Reads XML data from an EBU ADM (Audio Definiton Model) WAV File.
|
|
"""
|
|
|
|
def __init__(self, axml_data: bytes, chna_data: bytes):
|
|
header_fmt = "<HH"
|
|
uid_fmt = "<H12s14s11sx"
|
|
|
|
self.axml = ET.parse(BytesIO(axml_data))
|
|
|
|
self.track_count, uid_count = unpack(header_fmt, chna_data[0:4])
|
|
|
|
self.channel_uids = []
|
|
|
|
offset = calcsize(header_fmt)
|
|
for _ in range(uid_count):
|
|
|
|
track_index, uid, track_ref, pack_ref = unpack_from(uid_fmt, chna_data, offset)
|
|
|
|
# these values are either ascii or all null
|
|
|
|
self.channel_uids.append(ChannelEntry(track_index,
|
|
uid.decode('ascii') , track_ref.decode('ascii'), pack_ref.decode('ascii')))
|
|
|
|
offset += calcsize(uid_fmt)
|