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Jamie Hardt
2019-01-01 23:19:22 -08:00
parent 41b599923a
commit 99aa29c5f3
6 changed files with 247 additions and 101 deletions
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48
examples/wavinfo.ipynb
View File

@@ -96,7 +96,7 @@
"name": "stdout",
"output_type": "stream",
"text": [
"WavBextFormat(description='dUBITS=12311804\\r\\ndSCENE=A101\\r\\ndTAKE=4\\r\\ndTAPE=18Y12M31\\r\\ndFRAMERATE=23.976ND\\r\\ndSPEED=023.976-NDF\\r\\ndTRK1=MKH516 A\\r\\ndTRK2=Boom\\r\\n', originator='Sound Dev: 702T S#GR1112089007', originator_ref='aa4CKtcd13Vk', originator_date='2018-12-31', originator_time='12:40:07', time_reference=2191709524, version=0, umid=None, loudness_value=0.0, loudness_range=0.0, max_true_peak=0.0, max_momentary_loudness=0.0, max_shortterm_loudness=0.0, coding_history='A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch\\r\\n')\n"
"<wavinfo.wave_bext_reader.WavBextReader object at 0x110a0cac8>\n"
]
}
],
@@ -106,7 +106,7 @@
},
{
"cell_type": "code",
"execution_count": 8,
"execution_count": 7,
"metadata": {},
"outputs": [
{
@@ -126,6 +126,50 @@
"print(len(regn_bin))"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"{ 'artist': 'Frank Bry',\n",
" 'comment': 'BULLET Impact Plastic LCD TV Screen Shatter Debris 2x',\n",
" 'copyright': '2018 Creative Sound Design, LLC (The Recordist Christmas '\n",
" '2018) www.therecordist.com',\n",
" 'created_date': '2018-11-15',\n",
" 'engineer': None,\n",
" 'genre': 'Bullets',\n",
" 'keywords': None,\n",
" 'product': 'The Recordist Christmas 2018',\n",
" 'software': 'Soundminer',\n",
" 'source': None,\n",
" 'tape': None,\n",
" 'title': None}\n"
]
}
],
"source": [
"path = '../tests/test_files/BULLET Impact Plastic LCD TV Screen Shatter Debris 2x.wav'\n",
"\n",
"info = wavinfo.WavInfoReader(path)\n",
"\n",
"with open(path,'rb') as f:\n",
" chunk_tree = wavinfo.wave_parser.parse_chunk(f)\n",
" \n",
"pp.pprint(info.info.to_dict())\n",
"pp.pprint(info.bext.to_dict())"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
},
{
"cell_type": "code",
"execution_count": null,

86
wavinfo/wave_bext_reader.py Normal file
View File

@@ -0,0 +1,86 @@
import struct
class WavBextReader:
def __init__(self,bext_data,encoding):
# description[256]
# originator[32]
# originatorref[32]
# originatordate[10] "YYYY:MM:DD"
# originatortime[8] "HH:MM:SS"
# lowtimeref U32
# hightimeref U32
# version U16
# umid[64]
#
# EBU 3285 fields
# loudnessvalue S16 (in LUFS*100)
# loudnessrange S16 (in LUFS*100)
# maxtruepeak S16 (in dbTB*100)
# maxmomentaryloudness S16 (LUFS*100)
# maxshorttermloudness S16 (LUFS*100)
# reserved[180]
# codinghistory []
if bext_data is None:
return None
packstring = "<256s"+ "32s" + "32s" + "10s" + "8s" + "QH" + "64s" + "hhhhh" + "180s"
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
decoded = trimmed.decode(encoding)
return decoded
bext_version = unpacked[6]
if bext_version > 0:
self.umid = unpacked[6]
else:
self.umid = None
if bext_version > 1:
self.loudness_value = unpacked[8] / 100.0,
self.loudness_range = unpacked[9] / 100.0
self.max_true_peak = unpacked[10] / 100.0
self.max_momentary_loudness = unpacked[11] / 100.0
self.max_shortterm_loudness = unpacked[12] / 100.0
else:
self.loudness_value = None
self.loudness_range = None
self.max_true_peak = None
self.max_momentary_loudness = None
self.max_shortterm_loudness = None
self.description = sanatize_bytes(unpacked[0])
self.originator = sanatize_bytes(unpacked[1])
self.originator_ref = sanatize_bytes(unpacked[2])
self.originator_date = sanatize_bytes(unpacked[3])
self.originator_time = sanatize_bytes(unpacked[4])
self.time_reference = unpacked[5]
self.version = unpacked[6]
self.coding_history = sanatize_bytes(bext_data[rest_starts:])
def to_dict(self):
return {'description': self.description,
'originator': self.originator,
'originator_ref': self.originator_ref,
'originator_date': self.originator_date,
'originator_time': self.originator_time,
'time_reference': self.time_reference,
'version': self.version,
'coding_history': self.coding_history,
'loudness_value': self.loudness_value,
'loudness_range': self.loudness_range,
'max_true_peak': self.max_true_peak,
'max_momentary_loudness': self.max_momentary_loudness,
'max_shortterm_loudness': self.max_shortterm_loudness
}

64
wavinfo/wave_info_reader.py Normal file
View File

@@ -0,0 +1,64 @@
from .wave_parser import parse_chunk, ListChunkDescriptor
class WavInfoChunkReader:
def __init__(self, f, encoding):
self.encoding = encoding
f.seek(0)
parsed_chunks = parse_chunk(f)
list_chunks = [chunk for chunk in parsed_chunks.children \
if type(chunk) is ListChunkDescriptor]
self.info_chunk = next((chunk for chunk in list_chunks \
if chunk.signature == b'INFO'), None)
self.copyright = self._get_field(f,b'ICOP')
self.product = self._get_field(f,b'IPRD')
self.genre = self._get_field(f,b'IGNR')
self.artist = self._get_field(f,b'IART')
self.comment = self._get_field(f,b'ICMT')
self.software = self._get_field(f,b'ISFT')
self.created_date = self._get_field(f,b'ICRD')
self.engineer = self._get_field(f,b'IENG')
self.keywords = self._get_field(f,b'IKEY')
self.title = self._get_field(f,b'INAM')
self.source = self._get_field(f,b'ISRC')
self.tape = self._get_field(f,b'TAPE')
def _get_field(self, f, field_ident):
search = next( ( (chunk.start, chunk.length) for chunk in self.info_chunk.children \
if chunk.ident == field_ident ), None)
if search is not None:
f.seek(search[0])
data = f.read(search[1])
return data.decode(self.encoding).rstrip('\0')
else:
return None
def to_dict(self):
return {'copyright': self.copyright,
'product': self.product,
'genre': self.genre,
'artist': self.artist,
'comment': self.comment,
'software': self.software,
'created_date': self.created_date,
'engineer': self.engineer,
'keywords': self.keywords,
'title': self.title,
'source': self.source,
'tape': self.tape
}

28
wavinfo/wave_parser.py
View File

@@ -3,27 +3,37 @@ import struct
from collections import namedtuple
ListChunkDescriptor = namedtuple('ListChunkDescriptor' , 'signature children')
class ListChunkDescriptor(namedtuple('ListChunkDescriptor' , 'signature children')):
def find(chunk_path):
if len(chunk_path) > 1:
for chunk in self.children:
if type(chunk) is ListChunkDescriptor and \
chunk.signature is chunk_path[0]:
return chunk.find(chunk_path[1:])
else:
for chunk in self.children:
if type(chunk) is ChunkDescriptor and \
chunk.ident is chunk_path[0]:
return chunk
class ChunkDescriptor(namedtuple('ChunkDescriptor', 'ident start length') ):
def read_data(self, from_stream):
from_stream.seek(self.start)
return from_stream.read(self.length)
def parse_list_chunk(stream, length):
children = []
start = stream.tell()
signature = stream.read(4)
children = []
while (stream.tell() - start) < length:
children.append(parse_chunk(stream))
return ListChunkDescriptor(signature=signature, children=children)
def parse_chunk(stream):
ident = stream.read(4)
if len(ident) != 4:
@@ -47,11 +57,3 @@ def parse_chunk(stream):

106
wavinfo/wave_reader.py
View File

@@ -4,6 +4,8 @@ from collections import namedtuple
from .wave_parser import parse_chunk, ChunkDescriptor, ListChunkDescriptor
from .wave_ixml_reader import WavIXMLFormat
from .wave_bext_reader import WavBextReader
from .wave_info_reader import WavInfoChunkReader
WavDataDescriptor = namedtuple('WavDataDescriptor','byte_count frame_count')
@@ -22,7 +24,20 @@ class WavInfoReader():
"""
def __init__(self, path):
def __init__(self, path, info_encoding='latin_1', bext_encoding='ascii'):
"""
Parse a WAV audio file for metadata.
* `path`: A filesystem path to the wav file you wish to probe.
* `info_encoding`: The text encoding of the INFO metadata fields.
`latin_1`/Win CP1252 has always been a pretty good guess for this.
* `bext_encoding`: The text encoding to use when decoding the string
fields of the Broadcast-WAV extension. Per EBU 3285 this is ASCII
but this parameter is available to you if you encounter a werido.
"""
with open(path, 'rb') as f:
chunks = parse_chunk(f)
@@ -30,9 +45,9 @@ class WavInfoReader():
f.seek(0)
self.fmt = self._get_format(f)
self.bext = self._get_bext(f)
self.bext = self._get_bext(f, encoding=bext_encoding)
self.ixml = self._get_ixml(f)
self.info = self._get_info(f, encoding=info_encoding)
self.data = self._describe_data(f)
def _find_chunk_data(self, ident, from_stream, default_none=False):
@@ -57,7 +72,6 @@ class WavInfoReader():
frame_count= int(data_chunk.length / self.fmt.block_align))
def _get_format(self,f):
fmt_data = self._find_chunk_data(b'fmt ',f)
@@ -78,7 +92,8 @@ class WavInfoReader():
#0x0006 WAVE_FORMAT_ALAW 8-bit ITU-T G.711 A-law
#0x0007 WAVE_FORMAT_MULAW 8-bit ITU-T G.711 µ-law
#0xFFFE WAVE_FORMAT_EXTENSIBLE Determined by SubFormat
if unpacked[0] == 0x0001:
#https://sno.phy.queensu.ca/~phil/exiftool/TagNames/RIFF.html
return WavInfoFormat(audio_format = unpacked[0],
channel_count = unpacked[1],
sample_rate = unpacked[2],
@@ -87,83 +102,18 @@ class WavInfoReader():
bits_per_sample = unpacked[5]
)
def _get_bext(self,f,encoding='ascii'):
def _get_info(self, f, encoding):
finder = (chunk.signature for chunk in self.main_list \
if type(chunk) is ListChunkDescriptor)
if b'INFO' in finder:
return WavInfoChunkReader(f, encoding)
def _get_bext(self, f, encoding):
bext_data = self._find_chunk_data(b'bext',f,default_none=True)
# description[256]
# originator[32]
# originatorref[32]
# originatordate[10] "YYYY:MM:DD"
# originatortime[8] "HH:MM:SS"
# lowtimeref U32
# hightimeref U32
# version U16
# umid[64]
#
# EBU 3285 fields
# loudnessvalue S16 (in LUFS*100)
# loudnessrange S16 (in LUFS*100)
# maxtruepeak S16 (in dbTB*100)
# maxmomentaryloudness S16 (LUFS*100)
# maxshorttermloudness S16 (LUFS*100)
# reserved[180]
# codinghistory []
if bext_data is None:
return None
packstring = "<256s"+ "32s" + "32s" + "10s" + "8s" + "QH" + "64s" + "hhhhh" + "180s"
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
decoded = trimmed.decode(encoding)
return decoded
bext_version = unpacked[6]
if bext_version > 0:
umid = unpacked[6]
else:
umid = None
if bext_version > 1:
loudness_value = unpacked[8] / 100.0,
loudness_range = unpacked[9] / 100.0
max_true_peak = unpacked[10] / 100.0
max_momentary_loudness = unpacked[11] / 100.0
max_shortterm_loudness = unpacked[12] / 100.0
else:
loudness_value = None
loudness_range = None
max_true_peak = None
max_momentary_loudness = None
max_shortterm_loudness = None
return WavBextFormat(description=sanatize_bytes(unpacked[0]),
originator = sanatize_bytes(unpacked[1]),
originator_ref = sanatize_bytes(unpacked[2]),
originator_date = sanatize_bytes(unpacked[3]),
originator_time = sanatize_bytes(unpacked[4]),
time_reference = unpacked[5],
version = unpacked[6],
umid = umid,
loudness_value = loudness_value,
loudness_range = loudness_range,
max_true_peak = max_true_peak,
max_momentary_loudness = max_momentary_loudness,
max_shortterm_loudness = max_shortterm_loudness,
coding_history = sanatize_bytes(bext_data[rest_starts:])
)
return WavBextReader(bext_data, encoding)
def _get_ixml(self,f):
ixml_data = self._find_chunk_data(b'iXML',f,default_none=True)
if ixml_data is None:
return None