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This commit is contained in:
Jamie Hardt
2024-11-24 12:47:09 -08:00
parent 259994d514
commit dc18b4eb99
1 changed files with 15 additions and 17 deletions
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32
wavinfo/wave_smpl_reader.py
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@@ -5,27 +5,27 @@ from typing import Tuple, NamedTuple, List
class WaveSmplLoop(NamedTuple): class WaveSmplLoop(NamedTuple):
ident: int ident: int
loop_type: int loop_type: int
start: int start: int
end: int end: int
fraction: int fraction: int
repetition_count: int repetition_count: int
class WaveSmplReader: class WaveSmplReader:
def __init__(self, smpl_data: bytes): def __init__(self, smpl_data: bytes):
""" """
Read sampler metadata from smpl chunk. Read sampler metadata from smpl chunk.
""" """
header_field_fmt = "<IIIIIIbbbbII" header_field_fmt = "<IIIIIIbbbbII"
loop_field_fmt = "<IIIIII" loop_field_fmt = "<IIIIII"
header_size = struct.calcsize(header_field_fmt) header_size = struct.calcsize(header_field_fmt)
loop_size = struct.calcsize(loop_field_fmt) loop_size = struct.calcsize(loop_field_fmt)
unpacked_data = struct.unpack(header_field_fmt, unpacked_data = struct.unpack(header_field_fmt,
smpl_data[0:header_size]) smpl_data[0:header_size])
#: The MIDI Manufacturer's Association code for the sampler manufactuer, #: The MIDI Manufacturer's Association code for the sampler manufactuer,
@@ -39,7 +39,7 @@ class WaveSmplReader:
#: The number of nanoseconds in one audio frame. #: The number of nanoseconds in one audio frame.
self.sample_period: int = unpacked_data[2] self.sample_period: int = unpacked_data[2]
#: The MIDI note number for the loops in this sample #: The MIDI note number for the loops in this sample
self.midi_note: int = unpacked_data[3] self.midi_note: int = unpacked_data[3]
#: The number of semitones above the MIDI note the loops tune for. #: The number of semitones above the MIDI note the loops tune for.
@@ -48,22 +48,22 @@ class WaveSmplReader:
#: SMPTE timecode format, one of (0, 24, 25, 29, 30) #: SMPTE timecode format, one of (0, 24, 25, 29, 30)
self.smpte_format: int = unpacked_data[5] self.smpte_format: int = unpacked_data[5]
#: The SMPTE offset to apply, as a tuple of four ints representing #: The SMPTE offset to apply, as a tuple of four ints representing
#: hh, mm, ss, ff #: hh, mm, ss, ff
self.smpte_offset: Tuple[int, int, int, int] = unpacked_data[6:10] self.smpte_offset: Tuple[int, int, int, int] = unpacked_data[6:10]
loop_count = unpacked_data[10] loop_count = unpacked_data[10]
sampler_udata_length = unpacked_data[11] sampler_udata_length = unpacked_data[11]
#: List of loops in the file. #: List of loops in the file.
self.sample_loops: List[WaveSmplLoop] = [] self.sample_loops: List[WaveSmplLoop] = []
loop_buffer = smpl_data[header_field_fmt: loop_buffer = smpl_data[header_field_fmt:
header_field_fmt + loop_size * loop_count] header_field_fmt + loop_size * loop_count]
for unpacked_loop in struct.iter_unpack(loop_field_fmt, loop_buffer): for unpacked_loop in struct.iter_unpack(loop_field_fmt, loop_buffer):
self.sample_loops.append(WaveSmplLoop( self.sample_loops.append(WaveSmplLoop(
ident=unpacked_loop[0], ident=unpacked_loop[0],
loop_type=unpacked_loop[1], loop_type=unpacked_loop[1],
start=unpacked_loop[2], start=unpacked_loop[2],
end=unpacked_loop[3], end=unpacked_loop[3],
@@ -72,7 +72,5 @@ class WaveSmplReader:
#: Sampler-specific user data. #: Sampler-specific user data.
self.sampler_udata: bytes = smpl_data[ self.sampler_udata: bytes = smpl_data[
header_field_fmt + loop_size * loop_count : header_field_fmt + loop_size * loop_count:
header_field_fmt + loop_size * loop_count + sampler_udata_length] header_field_fmt + loop_size * loop_count + sampler_udata_length]