def VersionLength(name):
"""A struct for 32 or 64 bit fields, depending on version field."""
return Con.IfThenElse(name, lambda ctx: ctx["version"] == 0,
Con.UBInt32(None), Con.UBInt64(None))
class WavPackAudio(ApeTaggedAudio, AudioFile):
"""A WavPack audio file."""
SUFFIX = "wv"
NAME = SUFFIX
DEFAULT_COMPRESSION = "standard"
COMPRESSION_MODES = ("veryfast", "fast", "standard", "high", "veryhigh")
APE_TAG_CLASS = WavPackAPEv2
HEADER = Con.Struct(
"wavpackheader", Con.Const(Con.String("id", 4), 'wvpk'),
Con.ULInt32("block_size"), Con.ULInt16("version"),
Con.ULInt8("track_number"), Con.ULInt8("index_number"),
Con.ULInt32("total_samples"), Con.ULInt32("block_index"),
Con.ULInt32("block_samples"),
Con.Embed(
Con.BitStruct("flags", Con.Flag("floating_point_data"),
Con.Flag("hybrid_noise_shaping"),
Con.Flag("cross_channel_decorrelation"),
Con.Flag("joint_stereo"), Con.Flag("hybrid_mode"),
Con.Flag("mono_output"),
Con.Bits("bits_per_sample", 2),
Con.Bits("left_shift_data_low", 3),
Con.Flag("final_block_in_sequence"),
Con.Flag("initial_block_in_sequence"),
Con.Flag("hybrid_noise_balanced"),
Con.Flag("hybrid_mode_control_bitrate"),
Con.Flag("extended_size_integers"),
Con.Bit("sampling_rate_low"),
Con.Bits("maximum_magnitude", 5),
Con.Bits("left_shift_data_high", 2),
Con.Flag("reserved2"), Con.Flag("false_stereo"),
Con.Flag("use_IIR"), Con.Bits("reserved1", 2),
Con.Bits("sampling_rate_high", 3))),
Con.ULInt32("crc"))
SUB_HEADER = Con.Struct(
"wavpacksubheader",
Con.Embed(
Con.BitStruct("flags", Con.Flag("large_block"),
Con.Flag("actual_size_1_less"),
Con.Flag("nondecoder_data"),
Con.Bits("metadata_function", 5))),
Con.IfThenElse('size', lambda ctx: ctx['large_block'], ULInt24('s'),
Con.Byte('s')))
BITS_PER_SAMPLE = (8, 16, 24, 32)
SAMPLING_RATE = (6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
32000, 44100, 48000, 64000, 88200, 96000, 192000, 0)
__options__ = {
"veryfast": {
"block_size": 44100,
"joint_stereo": True,
"false_stereo": True,
"wasted_bits": True,
"decorrelation_passes": 1
},
"fast": {
"block_size": 44100,
"joint_stereo": True,
"false_stereo": True,
"wasted_bit": True,
"decorrelation_passes": 2
},
"standard": {
"block_size": 44100,
"joint_stereo": True,
"false_stereo": True,
"wasted_bits": True,
"decorrelation_passes": 5
},
"high": {
"block_size": 44100,
"joint_stereo": True,
"false_stereo": True,
"wasted_bits": True,
"decorrelation_passes": 10
},
"veryhigh": {
"block_size": 44100,
"joint_stereo": True,
"false_stereo": True,
"wasted_bits": True,
"decorrelation_passes": 16
}
}
def __init__(self, filename):
"""filename is a plain string."""
self.filename = filename
self.__samplerate__ = 0
self.__channels__ = 0
self.__bitspersample__ = 0
self.__total_frames__ = 0
try:
self.__read_info__()
except IOError, msg:
raise InvalidWavPack(str(msg))
