mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-27 05:03:37 +00:00
269 lines
9.2 KiB
Python
269 lines
9.2 KiB
Python
"""
|
|
Musical Instrument Digital Interface (MIDI) audio file parser.
|
|
|
|
Documentation:
|
|
- Standard MIDI File Format, Dustin Caldwell (downloaded on wotsit.org)
|
|
|
|
Author: Victor Stinner
|
|
Creation: 27 december 2006
|
|
"""
|
|
|
|
from hachoir.parser import Parser
|
|
from hachoir.field import (FieldSet, Bits, ParserError,
|
|
String, UInt32, UInt24, UInt16, UInt8, Enum, RawBits, RawBytes)
|
|
from hachoir.core.endian import BIG_ENDIAN
|
|
from hachoir.core.text_handler import textHandler, hexadecimal
|
|
from hachoir.core.tools import createDict, humanDurationNanosec
|
|
from hachoir.parser.common.tracker import NOTE_NAME
|
|
|
|
MAX_FILESIZE = 10 * 1024 * 1024
|
|
|
|
|
|
class Integer(Bits):
|
|
|
|
def __init__(self, parent, name, description=None):
|
|
Bits.__init__(self, parent, name, 8, description)
|
|
stream = parent.stream
|
|
addr = self.absolute_address
|
|
value = 0
|
|
while True:
|
|
bits = stream.readBits(addr, 8, parent.endian)
|
|
value = (value << 7) + (bits & 127)
|
|
if not (bits & 128):
|
|
break
|
|
addr += 8
|
|
self._size += 8
|
|
if 32 < self._size:
|
|
raise ParserError("Integer size is bigger than 32-bit")
|
|
self.createValue = lambda: value
|
|
|
|
|
|
def parseNote(parser):
|
|
yield Enum(UInt8(parser, "note", "Note number"), NOTE_NAME)
|
|
yield UInt8(parser, "velocity")
|
|
|
|
|
|
def parseControl(parser):
|
|
yield UInt8(parser, "control", "Controller number")
|
|
yield UInt8(parser, "value", "New value")
|
|
|
|
|
|
def parsePatch(parser):
|
|
yield UInt8(parser, "program", "New program number")
|
|
|
|
|
|
def parseChannel(parser, size=1):
|
|
yield UInt8(parser, "channel", "Channel number")
|
|
|
|
|
|
def parsePitch(parser):
|
|
yield UInt8(parser, "bottom", "(least sig) 7 bits of value")
|
|
yield UInt8(parser, "top", "(most sig) 7 bits of value")
|
|
|
|
|
|
def parseText(parser, size):
|
|
yield String(parser, "text", size)
|
|
|
|
|
|
def parseSMPTEOffset(parser, size):
|
|
yield RawBits(parser, "padding", 1)
|
|
yield Enum(Bits(parser, "frame_rate", 2),
|
|
{0: "24 fps", 1: "25 fps", 2: "30 fps (drop frame)", 3: "30 fps"})
|
|
yield Bits(parser, "hour", 5)
|
|
yield UInt8(parser, "minute")
|
|
yield UInt8(parser, "second")
|
|
yield UInt8(parser, "frame")
|
|
yield UInt8(parser, "subframe", "100 subframes per frame")
|
|
|
|
|
|
def formatTempo(field):
|
|
return humanDurationNanosec(field.value * 1000)
|
|
|
|
|
|
def parseTempo(parser, size):
|
|
yield textHandler(UInt24(parser, "microsec_quarter", "Microseconds per quarter note"), formatTempo)
|
|
|
|
|
|
def parseTimeSignature(parser, size):
|
|
yield UInt8(parser, "numerator", "Numerator of time signature")
|
|
yield UInt8(parser, "denominator", "denominator of time signature 2=quarter 3=eighth, etc.")
|
|
yield UInt8(parser, "nb_tick", "Number of ticks in metronome click")
|
|
yield UInt8(parser, "nb_32nd_note", "Number of 32nd notes to the quarter note")
|
|
|
|
|
|
class Command(FieldSet):
|
|
COMMAND = {}
|
|
for channel in range(16):
|
|
COMMAND[0x80 + channel] = ("Note off (channel %u)" %
|
|
channel, parseNote)
|
|
COMMAND[0x90 + channel] = ("Note on (channel %u)" % channel, parseNote)
|
|
COMMAND[
|
|
0xA0 + channel] = ("Key after-touch (channel %u)" % channel, parseNote)
|
|
COMMAND[0xB0 + channel] = ("Control change (channel %u)" %
|
|
channel, parseControl)
|
|
COMMAND[
|
|
0xC0 + channel] = ("Program (patch) change (channel %u)" % channel, parsePatch)
|
|
COMMAND[
|
|
0xD0 + channel] = ("Channel after-touch (channel %u)" % channel, parseChannel)
|
|
COMMAND[
|
|
0xE0 + channel] = ("Pitch wheel change (channel %u)" % channel, parsePitch)
|
|
COMMAND_DESC = createDict(COMMAND, 0)
|
|
COMMAND_PARSER = createDict(COMMAND, 1)
|
|
|
|
META_COMMAND_TEXT = 1
|
|
META_COMMAND_NAME = 3
|
|
META_COMMAND = {
|
|
0x00: ("Sets the track's sequence number", None),
|
|
0x01: ("Text event", parseText),
|
|
0x02: ("Copyright info", parseText),
|
|
0x03: ("Sequence or Track name", parseText),
|
|
0x04: ("Track instrument name", parseText),
|
|
0x05: ("Lyric", parseText),
|
|
0x06: ("Marker", parseText),
|
|
0x07: ("Cue point", parseText),
|
|
0x20: ("MIDI Channel Prefix", parseChannel),
|
|
0x2F: ("End of the track", None),
|
|
0x51: ("Set tempo", parseTempo),
|
|
0x54: ("SMPTE offset", parseSMPTEOffset),
|
|
0x58: ("Time Signature", parseTimeSignature),
|
|
0x59: ("Key signature", None),
|
|
0x7F: ("Sequencer specific information", None),
|
|
}
|
|
META_COMMAND_DESC = createDict(META_COMMAND, 0)
|
|
META_COMMAND_PARSER = createDict(META_COMMAND, 1)
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
if 'prev_command' in kwargs:
|
|
self.prev_command = kwargs['prev_command']
|
|
del kwargs['prev_command']
|
|
else:
|
|
self.prev_command = None
|
|
self.command = None
|
|
FieldSet.__init__(self, *args, **kwargs)
|
|
|
|
def createFields(self):
|
|
yield Integer(self, "time", "Delta time in ticks")
|
|
next = self.stream.readBits(
|
|
self.absolute_address + self.current_size, 8, self.root.endian)
|
|
if next & 0x80 == 0:
|
|
# "Running Status" command
|
|
if self.prev_command is None:
|
|
raise ParserError(
|
|
"Running Status command not preceded by another command.")
|
|
self.command = self.prev_command.command
|
|
else:
|
|
yield Enum(textHandler(UInt8(self, "command"), hexadecimal), self.COMMAND_DESC)
|
|
self.command = self["command"].value
|
|
if self.command == 0xFF:
|
|
yield Enum(textHandler(UInt8(self, "meta_command"), hexadecimal), self.META_COMMAND_DESC)
|
|
yield UInt8(self, "data_len")
|
|
size = self["data_len"].value
|
|
if size:
|
|
command = self["meta_command"].value
|
|
if command in self.META_COMMAND_PARSER:
|
|
parser = self.META_COMMAND_PARSER[command]
|
|
else:
|
|
parser = None
|
|
if parser is not None:
|
|
yield from parser(self, size)
|
|
else:
|
|
yield RawBytes(self, "data", size)
|
|
else:
|
|
if self.command not in self.COMMAND_PARSER:
|
|
raise ParserError("Unknown command: %s" %
|
|
self["command"].display)
|
|
parser = self.COMMAND_PARSER[self.command]
|
|
yield from parser(self)
|
|
|
|
def createDescription(self):
|
|
if "meta_command" in self:
|
|
return self["meta_command"].display
|
|
else:
|
|
return self.COMMAND_DESC[self.command]
|
|
|
|
|
|
class Track(FieldSet):
|
|
|
|
def __init__(self, *args):
|
|
FieldSet.__init__(self, *args)
|
|
self._size = (8 + self["size"].value) * 8
|
|
|
|
def createFields(self):
|
|
yield String(self, "marker", 4, "Track marker (MTrk)", charset="ASCII")
|
|
yield UInt32(self, "size")
|
|
cur = None
|
|
if True:
|
|
while not self.eof:
|
|
cur = Command(self, "command[]", prev_command=cur)
|
|
yield cur
|
|
else:
|
|
size = self["size"].value
|
|
if size:
|
|
yield RawBytes(self, "raw", size)
|
|
|
|
def createDescription(self):
|
|
command = self["command[0]"]
|
|
if "meta_command" in command \
|
|
and command["meta_command"].value in (Command.META_COMMAND_TEXT, Command.META_COMMAND_NAME) \
|
|
and "text" in command:
|
|
return command["text"].value.strip("\r\n")
|
|
else:
|
|
return ""
|
|
|
|
|
|
class Header(FieldSet):
|
|
static_size = 10 * 8
|
|
FILE_FORMAT = {
|
|
0: "Single track",
|
|
1: "Multiple tracks, synchronous",
|
|
2: "Multiple tracks, asynchronous",
|
|
}
|
|
|
|
def createFields(self):
|
|
yield UInt32(self, "size")
|
|
yield Enum(UInt16(self, "file_format"), self.FILE_FORMAT)
|
|
yield UInt16(self, "nb_track")
|
|
yield UInt16(self, "delta_time", "Delta-time ticks per quarter note")
|
|
|
|
def createDescription(self):
|
|
return "%s; %s tracks" % (
|
|
self["file_format"].display, self["nb_track"].value)
|
|
|
|
|
|
class MidiFile(Parser):
|
|
MAGIC = b"MThd"
|
|
PARSER_TAGS = {
|
|
"id": "midi",
|
|
"category": "audio",
|
|
"file_ext": ["mid", "midi"],
|
|
"mime": ("audio/mime", ),
|
|
"magic": ((MAGIC, 0),),
|
|
"min_size": 64,
|
|
"description": "MIDI audio"
|
|
}
|
|
endian = BIG_ENDIAN
|
|
|
|
def validate(self):
|
|
if self.stream.readBytes(0, 4) != self.MAGIC:
|
|
return "Invalid signature"
|
|
if self["header/size"].value != 6:
|
|
return "Invalid header size"
|
|
return True
|
|
|
|
def createFields(self):
|
|
yield String(self, "signature", 4, r"MIDI signature (MThd)", charset="ASCII")
|
|
yield Header(self, "header")
|
|
while not self.eof:
|
|
yield Track(self, "track[]")
|
|
|
|
def createDescription(self):
|
|
return "MIDI audio: %s" % self["header"].description
|
|
|
|
def createContentSize(self):
|
|
count = self["/header/nb_track"].value - 1
|
|
start = self["track[%u]" % count].absolute_address
|
|
# Search "End of track" of last track
|
|
end = self.stream.searchBytes(b"\xff\x2f\x00", start, MAX_FILESIZE * 8)
|
|
if end is not None:
|
|
return end + 3 * 8
|
|
return None
|