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Base documentation for ADM

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This commit is contained in:
Jamie Hardt
2022-11-23 14:42:31 -08:00
parent 8f2fd69b00
commit 97bdb23441
5 changed files with 27 additions and 6 deletions
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11
wavinfo/wave_adm_reader.py
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@@ -9,21 +9,24 @@ from typing import Iterable, Tuple
from lxml import etree as ET
ChannelEntry = namedtuple('ChannelEntry', "track_index uid track_ref pack_ref")
class WavADMReader:
"""
Reads XML data from an EBU ADM (Audio Definiton Model) WAV File.
"""
ChannelEntry = namedtuple('ChannelEntry', "track_index uid track_ref pack_ref")
def __init__(self, axml_data: bytes, chna_data: bytes):
header_fmt = "<HH"
uid_fmt = "<H12s14s11sx"
#: An :mod:`lxml.etree` of the ADM XML document
self.axml = ET.parse(BytesIO(axml_data))
self.track_count, uid_count = unpack(header_fmt, chna_data[0:4])
_, uid_count = unpack(header_fmt, chna_data[0:4])
#: A list of :class:`ChannelEntry` objects parsed from the
#: `chna` metadata chunk.
self.channel_uids = []
offset = calcsize(header_fmt)
@@ -33,7 +36,7 @@ class WavADMReader:
# these values are either ascii or all null
self.channel_uids.append(WavADMReader.ChannelEntry(track_index,
self.channel_uids.append(ChannelEntry(track_index,
uid.decode('ascii') , track_ref.decode('ascii'), pack_ref.decode('ascii')))
offset += calcsize(uid_fmt)