def __init__(self, fileobj):
header = fileobj.read(76)
if len(header) != 76 or not header.startswith("MAC "):
raise MonkeysAudioHeaderError("not a Monkey's Audio file")
self.version = cdata.ushort_le(header[4:6])
if self.version >= 3980:
(blocks_per_frame, final_frame_blocks, total_frames,
self.bits_per_sample, self.channels,
self.sample_rate) = struct.unpack("<IIIHHI", header[56:76])
else:
compression_level = cdata.ushort_le(header[6:8])
self.channels, self.sample_rate = struct.unpack(
"<HI", header[10:16])
total_frames, final_frame_blocks = struct.unpack(
"<II", header[24:32])
if self.version >= 3950:
blocks_per_frame = 73728 * 4
elif self.version >= 3900 or (self.version >= 3800 and
compression_level == 4):
blocks_per_frame = 73728
else:
blocks_per_frame = 9216
self.version /= 1000.0
self.length = 0.0
if self.sample_rate != 0 and total_frames > 0:
total_blocks = ((total_frames - 1) * blocks_per_frame +
final_frame_blocks)
self.length = float(total_blocks) / self.sample_rate
def __init__(self, fileobj):
header = fileobj.read(76)
if len(header) != 76 or not header.startswith("MAC "):
raise MonkeysAudioHeaderError("not a Monkey's Audio file")
self.version = cdata.ushort_le(header[4:6])
if self.version >= 3980:
(blocks_per_frame, final_frame_blocks, total_frames,
self.bits_per_sample, self.channels,
self.sample_rate) = struct.unpack("<IIIHHI", header[56:76])
else:
compression_level = cdata.ushort_le(header[6:8])
self.channels, self.sample_rate = struct.unpack(
"<HI", header[10:16])
total_frames, final_frame_blocks = struct.unpack(
"<II", header[24:32])
if self.version >= 3950:
blocks_per_frame = 73728 * 4
elif self.version >= 3900 or (self.version >= 3800
and compression_level == 4):
blocks_per_frame = 73728
else:
blocks_per_frame = 9216
self.version /= 1000.0
self.length = 0.0
if self.sample_rate != 0 and total_frames > 0:
total_blocks = ((total_frames - 1) * blocks_per_frame +
final_frame_blocks)
self.length = float(total_blocks) / self.sample_rate
def __init__(self, fileobj):
header = fileobj.read(32)
if len(header) != 32:
raise MusepackHeaderError("not a Musepack file")
# Skip ID3v2 tags
if header[:3] == "ID3":
size = 10 + BitPaddedInt(header[6:10])
fileobj.seek(size)
header = fileobj.read(32)
if len(header) != 32:
raise MusepackHeaderError("not a Musepack file")
# SV7
if header.startswith("MP+"):
self.version = ord(header[3]) & 0xF
if self.version < 7:
raise MusepackHeaderError("not a Musepack file")
frames = cdata.uint_le(header[4:8])
flags = cdata.uint_le(header[8:12])
self.title_peak, self.title_gain = struct.unpack(
"<Hh", header[12:16])
self.album_peak, self.album_gain = struct.unpack(
"<Hh", header[16:20])
self.title_gain /= 100.0
self.album_gain /= 100.0
self.title_peak /= 65535.0
self.album_peak /= 65535.0
self.sample_rate = RATES[(flags >> 16) & 0x0003]
self.bitrate = 0
# SV4-SV6
else:
header_dword = cdata.uint_le(header[0:4])
self.version = (header_dword >> 11) & 0x03FF
if self.version < 4 or self.version > 6:
raise MusepackHeaderError("not a Musepack file")
self.bitrate = (header_dword >> 23) & 0x01FF
self.sample_rate = 44100
if self.version >= 5:
frames = cdata.uint_le(header[4:8])
else:
frames = cdata.ushort_le(header[6:8])
if self.version < 6:
frames -= 1
self.channels = 2
self.length = float(frames * 1152 - 576) / self.sample_rate
if not self.bitrate and self.length != 0:
fileobj.seek(0, 2)
self.bitrate = int(fileobj.tell() * 8 / (self.length * 1000) + 0.5)
def __init__(self, fileobj):
header = fileobj.read(32)
if len(header) != 32:
raise MusepackHeaderError("not a Musepack file")
# Skip ID3v2 tags
if header[:3] == "ID3":
size = 10 + BitPaddedInt(header[6:10])
fileobj.seek(size)
header = fileobj.read(32)
if len(header) != 32:
raise MusepackHeaderError("not a Musepack file")
# SV7
if header.startswith("MP+"):
self.version = ord(header[3]) & 0xF
if self.version < 7:
raise MusepackHeaderError("not a Musepack file")
frames = cdata.uint_le(header[4:8])
flags = cdata.uint_le(header[8:12])
self.title_peak, self.title_gain = struct.unpack(
"<Hh", header[12:16])
self.album_peak, self.album_gain = struct.unpack(
"<Hh", header[16:20])
self.title_gain /= 100.0
self.album_gain /= 100.0
self.title_peak /= 65535.0
self.album_peak /= 65535.0
self.sample_rate = RATES[(flags >> 16) & 0x0003]
self.bitrate = 0
# SV4-SV6
else:
header_dword = cdata.uint_le(header[0:4])
self.version = (header_dword >> 11) & 0x03FF
if self.version < 4 or self.version > 6:
raise MusepackHeaderError("not a Musepack file")
self.bitrate = (header_dword >> 23) & 0x01FF
self.sample_rate = 44100
if self.version >= 5:
frames = cdata.uint_le(header[4:8])
else:
frames = cdata.ushort_le(header[6:8])
if self.version < 6:
frames -= 1
self.channels = 2
self.length = float(frames * 1152 - 576) / self.sample_rate
if not self.bitrate and self.length != 0:
fileobj.seek(0, 2)
self.bitrate = int(fileobj.tell() * 8 / (self.length * 1000) + 0.5)
