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lib/mutagen/mp3.py
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289
lib/mutagen/mp3.py
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# -*- coding: utf-8 -*-
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# Copyright (C) 2006 Joe Wreschnig
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of version 2 of the GNU General Public License as
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# published by the Free Software Foundation.
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"""MPEG audio stream information and tags."""
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import os
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import struct
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from ._compat import endswith
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from mutagen import StreamInfo
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from mutagen._util import MutagenError
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from mutagen.id3 import ID3FileType, BitPaddedInt, delete
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__all__ = ["MP3", "Open", "delete", "MP3"]
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class error(RuntimeError, MutagenError):
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pass
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class HeaderNotFoundError(error, IOError):
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pass
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class InvalidMPEGHeader(error, IOError):
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pass
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# Mode values.
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STEREO, JOINTSTEREO, DUALCHANNEL, MONO = range(4)
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class MPEGInfo(StreamInfo):
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"""MPEG audio stream information
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Parse information about an MPEG audio file. This also reads the
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Xing VBR header format.
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This code was implemented based on the format documentation at
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http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm.
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Useful attributes:
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* length -- audio length, in seconds
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* bitrate -- audio bitrate, in bits per second
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* sketchy -- if true, the file may not be valid MPEG audio
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Useless attributes:
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* version -- MPEG version (1, 2, 2.5)
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* layer -- 1, 2, or 3
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* mode -- One of STEREO, JOINTSTEREO, DUALCHANNEL, or MONO (0-3)
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* protected -- whether or not the file is "protected"
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* padding -- whether or not audio frames are padded
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* sample_rate -- audio sample rate, in Hz
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"""
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# Map (version, layer) tuples to bitrates.
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__BITRATE = {
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(1, 1): [0, 32, 64, 96, 128, 160, 192, 224,
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256, 288, 320, 352, 384, 416, 448],
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(1, 2): [0, 32, 48, 56, 64, 80, 96, 112, 128,
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160, 192, 224, 256, 320, 384],
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(1, 3): [0, 32, 40, 48, 56, 64, 80, 96, 112,
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128, 160, 192, 224, 256, 320],
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(2, 1): [0, 32, 48, 56, 64, 80, 96, 112, 128,
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144, 160, 176, 192, 224, 256],
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(2, 2): [0, 8, 16, 24, 32, 40, 48, 56, 64,
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80, 96, 112, 128, 144, 160],
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}
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__BITRATE[(2, 3)] = __BITRATE[(2, 2)]
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for i in range(1, 4):
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__BITRATE[(2.5, i)] = __BITRATE[(2, i)]
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# Map version to sample rates.
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__RATES = {
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1: [44100, 48000, 32000],
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2: [22050, 24000, 16000],
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2.5: [11025, 12000, 8000]
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}
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sketchy = False
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def __init__(self, fileobj, offset=None):
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"""Parse MPEG stream information from a file-like object.
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If an offset argument is given, it is used to start looking
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for stream information and Xing headers; otherwise, ID3v2 tags
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will be skipped automatically. A correct offset can make
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loading files significantly faster.
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"""
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try:
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size = os.path.getsize(fileobj.name)
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except (IOError, OSError, AttributeError):
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fileobj.seek(0, 2)
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size = fileobj.tell()
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# If we don't get an offset, try to skip an ID3v2 tag.
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if offset is None:
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fileobj.seek(0, 0)
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idata = fileobj.read(10)
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try:
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id3, insize = struct.unpack('>3sxxx4s', idata)
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except struct.error:
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id3, insize = '', 0
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insize = BitPaddedInt(insize)
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if id3 == b'ID3' and insize > 0:
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offset = insize + 10
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else:
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offset = 0
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# Try to find two valid headers (meaning, very likely MPEG data)
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# at the given offset, 30% through the file, 60% through the file,
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# and 90% through the file.
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for i in [offset, 0.3 * size, 0.6 * size, 0.9 * size]:
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try:
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self.__try(fileobj, int(i), size - offset)
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except error:
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pass
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else:
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break
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# If we can't find any two consecutive frames, try to find just
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# one frame back at the original offset given.
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else:
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self.__try(fileobj, offset, size - offset, False)
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self.sketchy = True
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def __try(self, fileobj, offset, real_size, check_second=True):
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# This is going to be one really long function; bear with it,
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# because there's not really a sane point to cut it up.
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fileobj.seek(offset, 0)
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# We "know" we have an MPEG file if we find two frames that look like
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# valid MPEG data. If we can't find them in 32k of reads, something
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# is horribly wrong (the longest frame can only be about 4k). This
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# is assuming the offset didn't lie.
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data = fileobj.read(32768)
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frame_1 = data.find(b"\xff")
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while 0 <= frame_1 <= (len(data) - 4):
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frame_data = struct.unpack(">I", data[frame_1:frame_1 + 4])[0]
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if ((frame_data >> 16) & 0xE0) != 0xE0:
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frame_1 = data.find(b"\xff", frame_1 + 2)
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else:
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version = (frame_data >> 19) & 0x3
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layer = (frame_data >> 17) & 0x3
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protection = (frame_data >> 16) & 0x1
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bitrate = (frame_data >> 12) & 0xF
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sample_rate = (frame_data >> 10) & 0x3
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padding = (frame_data >> 9) & 0x1
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# private = (frame_data >> 8) & 0x1
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self.mode = (frame_data >> 6) & 0x3
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# mode_extension = (frame_data >> 4) & 0x3
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# copyright = (frame_data >> 3) & 0x1
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# original = (frame_data >> 2) & 0x1
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# emphasis = (frame_data >> 0) & 0x3
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if (version == 1 or layer == 0 or sample_rate == 0x3 or
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bitrate == 0 or bitrate == 0xF):
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frame_1 = data.find(b"\xff", frame_1 + 2)
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else:
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break
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else:
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raise HeaderNotFoundError("can't sync to an MPEG frame")
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# There is a serious problem here, which is that many flags
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# in an MPEG header are backwards.
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self.version = [2.5, None, 2, 1][version]
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self.layer = 4 - layer
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self.protected = not protection
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self.padding = bool(padding)
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self.bitrate = self.__BITRATE[(self.version, self.layer)][bitrate]
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self.bitrate *= 1000
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self.sample_rate = self.__RATES[self.version][sample_rate]
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if self.layer == 1:
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frame_length = (
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(12 * self.bitrate // self.sample_rate) + padding) * 4
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frame_size = 384
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elif self.version >= 2 and self.layer == 3:
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frame_length = (72 * self.bitrate // self.sample_rate) + padding
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frame_size = 576
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else:
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frame_length = (144 * self.bitrate // self.sample_rate) + padding
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frame_size = 1152
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if check_second:
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possible = int(frame_1 + frame_length)
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if possible > len(data) + 4:
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raise HeaderNotFoundError("can't sync to second MPEG frame")
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try:
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frame_data = struct.unpack(
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">H", data[possible:possible + 2])[0]
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except struct.error:
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raise HeaderNotFoundError("can't sync to second MPEG frame")
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if (frame_data & 0xFFE0) != 0xFFE0:
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raise HeaderNotFoundError("can't sync to second MPEG frame")
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self.length = 8 * real_size / float(self.bitrate)
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# Try to find/parse the Xing header, which trumps the above length
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# and bitrate calculation.
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fileobj.seek(offset, 0)
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data = fileobj.read(32768)
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try:
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xing = data[:-4].index(b"Xing")
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except ValueError:
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# Try to find/parse the VBRI header, which trumps the above length
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# calculation.
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try:
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vbri = data[:-24].index(b"VBRI")
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except ValueError:
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pass
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else:
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# If a VBRI header was found, this is definitely MPEG audio.
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self.sketchy = False
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vbri_version = struct.unpack('>H', data[vbri + 4:vbri + 6])[0]
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if vbri_version == 1:
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frame_count = struct.unpack(
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'>I', data[vbri + 14:vbri + 18])[0]
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samples = float(frame_size * frame_count)
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self.length = (samples / self.sample_rate) or self.length
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else:
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# If a Xing header was found, this is definitely MPEG audio.
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self.sketchy = False
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flags = struct.unpack('>I', data[xing + 4:xing + 8])[0]
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if flags & 0x1:
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frame_count = struct.unpack('>I', data[xing + 8:xing + 12])[0]
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samples = float(frame_size * frame_count)
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self.length = (samples / self.sample_rate) or self.length
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if flags & 0x2:
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bitrate_data = struct.unpack(
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'>I', data[xing + 12:xing + 16])[0]
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self.bitrate = int((bitrate_data * 8) // self.length)
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def pprint(self):
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s = "MPEG %s layer %d, %d bps, %s Hz, %.2f seconds" % (
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self.version, self.layer, self.bitrate, self.sample_rate,
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self.length)
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if self.sketchy:
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s += " (sketchy)"
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return s
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class MP3(ID3FileType):
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"""An MPEG audio (usually MPEG-1 Layer 3) file.
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:ivar info: :class:`MPEGInfo`
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:ivar tags: :class:`ID3 <mutagen.id3.ID3>`
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"""
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_Info = MPEGInfo
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_mimes = ["audio/mpeg", "audio/mpg", "audio/x-mpeg"]
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@property
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def mime(self):
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l = self.info.layer
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return ["audio/mp%d" % l, "audio/x-mp%d" % l] + super(MP3, self).mime
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@staticmethod
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def score(filename, fileobj, header_data):
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filename = filename.lower()
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return (header_data.startswith(b"ID3") * 2 +
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endswith(filename, b".mp3") +
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endswith(filename, b".mp2") + endswith(filename, b".mpg") +
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endswith(filename, b".mpeg"))
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Open = MP3
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class EasyMP3(MP3):
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"""Like MP3, but uses EasyID3 for tags.
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:ivar info: :class:`MPEGInfo`
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:ivar tags: :class:`EasyID3 <mutagen.easyid3.EasyID3>`
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"""
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from mutagen.easyid3 import EasyID3 as ID3
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ID3 = ID3
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