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Text cleanup/red policing

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This commit is contained in:
Jamie Hardt
2023-11-08 19:21:47 -08:00
parent 86a4edc983
commit 4f51584fe9
3 changed files with 37 additions and 21 deletions
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15
wavinfo/wave_bext_reader.py
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@@ -8,17 +8,20 @@ class WavBextReader:
"""
Read Broadcast-WAV extended metadata.
: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.
: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"
packstring = "<256s" + "32s" + "32s" + "10s" + "8s" + "QH" + "64s" + \
"hhhhh" + "180s"
rest_starts = struct.calcsize(packstring)
unpacked = struct.unpack(packstring, bext_data[:rest_starts])
def sanitize_bytes(b : bytes) -> str:
# honestly can't remember why I'm stripping nulls this way
first_null = next((index for index, byte in enumerate(b) if byte == 0), None)
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
@@ -50,8 +53,8 @@ class WavBextReader:
#: BEXT version.
self.version : int = unpacked[6]
#: SMPTE 330M UMID of this audio file, 64 bytes are allocated though the UMID
#: may only be 32 bytes long.
#: SMPTE 330M UMID of this audio file, 64 bytes are allocated though
#: the UMID may only be 32 bytes long.
self.umid : Optional[bytes] = None
#: EBU R128 Integrated loudness, in LUFS.

3
wavinfo/wave_cues_reader.py
View File

@@ -114,7 +114,8 @@ class CueEntry(NamedTuple):
@classmethod
def read(cls, data: bytes) -> 'CueEntry':
assert len(data) == cls.format_size(), \
f"cue data size incorrect, expected {calcsize(cls.Format)} found {len(data)}"
(f"cue data size incorrect, expected {calcsize(cls.Format)} "
"found {len(data)}")
parsed = unpack(cls.Format, data)

40
wavinfo/wave_dbmd_reader.py
View File

@@ -208,8 +208,8 @@ class DolbyDigitalPlusMetadata:
class PreferredDownMixMode(Enum):
"""
Indicates the creating engineer's preference of what the receiver should
downmix.
Indicates the creating engineer's preference of what the receiver
should downmix.
§ 4.3.8.1
"""
NOT_INDICATED = 0b00
@@ -386,7 +386,8 @@ class DolbyDigitalPlusMetadata:
# downmix_mode, ltrt_center_downmix_level, ltrt_surround_downmix_level
def ext_bsi1_word2(b):
return DolbyDigitalPlusMetadata.PreferredDownMixMode(b & 0xC0 >> 6), \
return DolbyDigitalPlusMetadata\
.PreferredDownMixMode(b & 0xC0 >> 6), \
DolbyDigitalPlusMetadata.DownMixLevelToken(b & 0x38 >> 3), \
DolbyDigitalPlusMetadata.DownMixLevelToken(b & 0x7)
@@ -423,14 +424,19 @@ class DolbyDigitalPlusMetadata:
pid = program_id(buffer[0])
lfe_on, bitstream_mode, audio_coding_mode = program_info(buffer[1])
ddplus_reserved1(buffer[2:2])
center_downmix_level, surround_downmix_level, dolby_surround_encoded = surround_config(buffer[4])
langcode_present, copyright_bitstream, original_bitstream, dialnorm = dialnorm_info(buffer[5])
center_downmix_level, surround_downmix_level, \
dolby_surround_encoded = surround_config(buffer[4])
langcode_present, copyright_bitstream, original_bitstream, \
dialnorm = dialnorm_info(buffer[5])
langcode = langcod(buffer[6])
prod_info_exists, mixlevel, roomtype = audio_prod_info(buffer[7])
loro_center_downmix_level, loro_surround_downmix_level = ext_bsi1_word1(buffer[8])
downmix_mode, ltrt_center_downmix_level, ltrt_surround_downmix_level = ext_bsi1_word2(buffer[9])
surround_ex_mode, dolby_headphone_encoded, ad_converter_type = ext_bsi2_word1(buffer[10])
loro_center_downmix_level, \
loro_surround_downmix_level = ext_bsi1_word1(buffer[8])
downmix_mode, ltrt_center_downmix_level, \
ltrt_surround_downmix_level = ext_bsi1_word2(buffer[9])
surround_ex_mode, dolby_headphone_encoded, \
ad_converter_type = ext_bsi2_word1(buffer[10])
ddplus_reserved2(buffer[11:14])
compression = compr1(buffer[14])
@@ -494,8 +500,9 @@ class DolbyAtmosMetadata:
@classmethod
def load(cls, data: bytes):
assert len(data) == cls.SEGMENT_LENGTH, "DolbyAtmosMetadata segment "\
"is incorrect length, expected %i actual was %i" % (cls.SEGMENT_LENGTH, len(data))
assert len(data) == cls.SEGMENT_LENGTH, ("DolbyAtmosMetadata segment "
"is incorrect length, "
"expected %i actual was %i") % (cls.SEGMENT_LENGTH, len(data))
h = BytesIO(data)
@@ -513,7 +520,9 @@ class DolbyAtmosMetadata:
warp_mode = a_val & 0x7
return DolbyAtmosMetadata(tool_name=toolname,
tool_version=(major, minor, fix), warp_mode=DolbyAtmosMetadata.WarpMode(warp_mode))
tool_version=(major, minor, fix),
warp_mode=DolbyAtmosMetadata\
.WarpMode(warp_mode))
@dataclass
@@ -521,7 +530,8 @@ class DolbyAtmosSupplementalMetadata:
"""
Dolby Atmos supplemental metadata segment.
https://github.com/DolbyLaboratories/dbmd-atmos-parser/blob/master/dbmd_atmos_parse/src/dbmd_atmos_parse.c
https://github.com/DolbyLaboratories/dbmd-atmos-parser/blob/
master/dbmd_atmos_parse/src/dbmd_atmos_parse.c
"""
class BinauralRenderMode(Enum):
@@ -617,7 +627,8 @@ class WavDolbyMetadataReader:
else:
seg_size = unpack("<H", h.read(2))[0]
seg_payload = h.read(seg_size)
expected_checksum = WavDolbyMetadataReader.segment_checksum(seg_payload, seg_size)
expected_checksum = WavDolbyMetadataReader\
.segment_checksum(seg_payload, seg_size)
checksum = unpack("B", h.read(1))[0]
segment = seg_payload
@@ -628,7 +639,8 @@ class WavDolbyMetadataReader:
elif stype == SegmentType.DolbyAtmosSupplemental:
segment = DolbyAtmosSupplementalMetadata.load(segment)
self.segment_list.append( (stype, checksum == expected_checksum, segment) )
self.segment_list\
.append((stype, checksum == expected_checksum, segment))
def dolby_digital_plus(self) -> List[DolbyDigitalPlusMetadata]:
"""