def __init__(self, name):
Con.Adapter.__init__(
self,
Con.Struct(
name,
Con.Embed(
Con.BitStruct(None, Con.Flag("signed"),
Con.Bits("exponent", 15))),
Con.UBInt64("mantissa")))
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))
ATOM_MVHD = Con.Struct(
"mvhd", Con.Byte("version"), Con.String("flags", 3),
VersionLength("created_mac_UTC_date"),
VersionLength("modified_mac_UTC_date"), Con.UBInt32("time_scale"),
VersionLength("duration"), Con.UBInt32("playback_speed"),
Con.UBInt16("user_volume"), Con.Padding(10),
Con.Struct("windows", Con.UBInt32("geometry_matrix_a"),
Con.UBInt32("geometry_matrix_b"),
Con.UBInt32("geometry_matrix_u"),
Con.UBInt32("geometry_matrix_c"),
Con.UBInt32("geometry_matrix_d"),
Con.UBInt32("geometry_matrix_v"),
Con.UBInt32("geometry_matrix_x"),
Con.UBInt32("geometry_matrix_y"),
Con.UBInt32("geometry_matrix_w")),
Con.UBInt64("quicktime_preview"), Con.UBInt32("quicktime_still_poster"),
Con.UBInt64("quicktime_selection_time"),
Con.UBInt32("quicktime_current_time"), Con.UBInt32("next_track_id"))
ATOM_IODS = Con.Struct(
"iods", Con.Byte("version"), Con.String("flags", 3), Con.Byte("type_tag"),
Con.Switch(
"descriptor", lambda ctx: ctx.type_tag, {
0x10:
Con.Struct(
None,
Con.StrictRepeater(3, Con.Byte("extended_descriptor_type")),
Con.Byte("descriptor_type_length"), Con.UBInt16("OD_ID"),
Con.Byte("OD_profile"), Con.Byte("scene_profile"),
Con.Byte("audio_profile"), Con.Byte("video_profile"),
Con.Byte("graphics_profile")),
