jamie/wavinfo
1
0
Fork 0
mirror of https://github.com/iluvcapra/wavinfo.git synced 2026-01-01 17:30:41 +00:00
Code Issues Packages Projects Releases Wiki Activity

Tests

Browse Source
This commit is contained in:
Jamie Hardt
2019-01-01 11:47:09 -08:00
parent 4713158e00
commit feb8753ff9
10 changed files with 508 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
wavinfo/wave_reader.py
View File

@@ -9,8 +9,8 @@ WavDataDescriptor = namedtuple('WavDataDescriptor','byte_count frame_count')
WavInfoFormat = namedtuple("WavInfoFormat",'audio_format channel_count sample_rate byte_rate block_align bits_per_sample')
WavBextFormat = namedtuple("WavBextFormat",'description originator originator_ref ' +
'originator_date originator_time time_reference version umid ' +
WavBextFormat = namedtuple("WavBextFormat",'description originator originator_ref ' +
'originator_date originator_time time_reference version umid ' +
'loudness_value loudness_range max_true_peak max_momentary_loudness max_shortterm_loudness ' +
'coding_history')
@@ -25,10 +25,10 @@ class WavInfoReader():
def __init__(self, path):
with open(path, 'rb') as f:
chunks = parse_chunk(f)
self.main_list = chunks.children
f.seek(0)
self.fmt = self._get_format(f)
self.bext = self._get_bext(f)
self.ixml = self._get_ixml(f)
@@ -53,14 +53,14 @@ class WavInfoReader():
def _describe_data(self,f):
data_chunk = next(c for c in self.main_list if c.ident == b'data')
return WavDataDescriptor(byte_count= data_chunk.length,
return WavDataDescriptor(byte_count= data_chunk.length,
frame_count= int(data_chunk.length / self.fmt.block_align))
def _get_format(self,f):
fmt_data = self._find_chunk_data(b'fmt ',f)
# The format chunk is
# audio_format U16
# channel_count U16
@@ -70,9 +70,9 @@ class WavInfoReader():
# bits_per_sampl U16
packstring = "<HHIIHH"
rest_starts = struct.calcsize(packstring)
unpacked = struct.unpack(packstring, fmt_data[:rest_starts])
#0x0001 WAVE_FORMAT_PCM PCM
#0x0003 WAVE_FORMAT_IEEE_FLOAT IEEE float
#0x0006 WAVE_FORMAT_ALAW 8-bit ITU-T G.711 A-law
@@ -91,7 +91,7 @@ class WavInfoReader():
bext_data = self._find_chunk_data(b'bext',f,default_none=True)
# description[256]
# description[256]
# originator[32]
# originatorref[32]
# originatordate[10] "YYYY:MM:DD"
@@ -100,7 +100,7 @@ class WavInfoReader():
# hightimeref U32
# version U16
# umid[64]
#
#
# EBU 3285 fields
# loudnessvalue S16 (in LUFS*100)
# loudnessrange S16 (in LUFS*100)
@@ -113,10 +113,10 @@ class WavInfoReader():
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])
return WavBextFormat(description=unpacked[0].decode('ascii').rstrip('\0'),
originator = unpacked[1].decode('ascii').rstrip('\0'),
originator_ref = unpacked[2].decode('ascii').rstrip('\0'),
@@ -125,11 +125,11 @@ class WavInfoReader():
time_reference = unpacked[5],
version = unpacked[6],
umid = unpacked[7],
loudness_value = unpacked[8],
loudness_range = unpacked[9],
max_true_peak = unpacked[10],
max_momentary_loudness = unpacked[11],
max_shortterm_loudness = unpacked[12],
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,
coding_history = bext_data[rest_starts:].decode('ascii').rstrip('\0')
)
@@ -141,8 +141,8 @@ class WavInfoReader():
ixml_string = ixml_data.decode('utf-8')
return WavIXMLFormat(ixml_string)