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420 lines
14 KiB
Python
420 lines
14 KiB
Python
"""
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MPEG audio file parser.
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Creation: 12 decembre 2005
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Author: Victor Stinner
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"""
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from hachoir.parser import Parser
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from hachoir.field import (FieldSet,
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MissingField, ParserError, createOrphanField,
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Bit, Bits, Enum,
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PaddingBits, PaddingBytes,
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RawBytes)
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from hachoir.parser.audio.id3 import ID3v1, ID3v2
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from hachoir.core.endian import BIG_ENDIAN
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from hachoir.core.tools import humanFrequency, humanBitSize
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from hachoir.core.bits import long2raw
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from hachoir.stream import InputStreamError
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# Max MP3 filesize: 200 MB
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MAX_FILESIZE = 200 * 1024 * 1024 * 8
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class Frame(FieldSet):
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VERSION_NAME = {0: "2.5", 2: "2", 3: "1"}
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MPEG_I = 3
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MPEG_II = 2
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MPEG_II_5 = 0
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LAYER_NAME = {1: "III", 2: "II", 3: "I"}
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LAYER_I = 3
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LAYER_II = 2
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LAYER_III = 1
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# Bit rates (bit_rate * 1000 = bits/sec)
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# key 15 is always invalid
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BIT_RATES = {
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1: ( # MPEG1
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(0, 32, 64, 96, 128, 160, 192, 224, 256,
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288, 320, 352, 384, 416, 448), # layer I
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(0, 32, 48, 56, 64, 80, 96, 112, 128,
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160, 192, 224, 256, 320, 384), # layer II
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(0, 32, 40, 48, 56, 64, 80, 96, 112,
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128, 160, 192, 224, 256, 320), # layer III
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# - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 -
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),
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2: ( # MPEG2 / MPEG2.5
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(0, 32, 48, 56, 64, 80, 96, 112, 128,
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144, 160, 176, 192, 224, 256), # layer I
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(0, 8, 16, 24, 32, 40, 48, 56, 64,
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80, 96, 112, 128, 144, 160), # layer II
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(0, 8, 16, 24, 32, 40, 48, 56, 64,
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80, 96, 112, 128, 144, 160), # layer III
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# - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 -
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)
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}
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SAMPLING_RATES = {
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3: {0: 44100, 1: 48000, 2: 32000}, # MPEG1
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2: {0: 22050, 1: 24000, 2: 16000}, # MPEG2
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0: {0: 11025, 1: 12000, 2: 8000} # MPEG2.5
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}
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EMPHASIS_NAME = {0: "none", 1: "50/15 ms", 3: "CCIT J.17"}
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CHANNEL_MODE_NAME = {
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0: "Stereo",
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1: "Joint stereo",
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2: "Dual channel",
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3: "Single channel"
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}
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# Channel mode => number of channels
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NB_CHANNEL = {
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0: 2,
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1: 2,
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2: 2,
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3: 1,
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}
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def __init__(self, *args, **kw):
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FieldSet.__init__(self, *args, **kw)
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if not self._size:
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frame_size = self.getFrameSize()
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if not frame_size:
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raise ParserError("MPEG audio: Invalid frame %s" % self.path)
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self._size = min(frame_size * 8, self.parent.size - self.address)
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def createFields(self):
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# Header
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yield PaddingBits(self, "sync", 11, "Synchronize bits (set to 1)", pattern=1)
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yield Enum(Bits(self, "version", 2, "MPEG audio version"), self.VERSION_NAME)
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yield Enum(Bits(self, "layer", 2, "MPEG audio layer"), self.LAYER_NAME)
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yield Bit(self, "crc16", "No CRC16 protection?")
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# Rates and padding
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yield Bits(self, "bit_rate", 4, "Bit rate")
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yield Bits(self, "sampling_rate", 2, "Sampling rate")
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yield Bit(self, "use_padding", "Stream field use padding?")
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yield Bit(self, "extension", "Extension")
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# Channel mode, mode extension, copyright, ...
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yield Enum(Bits(self, "channel_mode", 2, "Channel mode"), self.CHANNEL_MODE_NAME)
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yield Bits(self, "mode_ext", 2, "Mode extension")
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yield Bit(self, "copyright", "Is copyrighted?")
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yield Bit(self, "original", "Is original?")
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yield Enum(Bits(self, "emphasis", 2, "Emphasis"), self.EMPHASIS_NAME)
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size = (self.size - self.current_size) // 8
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if size:
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yield RawBytes(self, "data", size)
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def isValid(self):
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return (self["layer"].value != 0
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and self["sync"].value == 2047
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and self["version"].value != 1
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and self["sampling_rate"].value != 3
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and self["bit_rate"].value not in (0, 15)
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and self["emphasis"].value != 2)
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def getSampleRate(self):
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"""
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Read sampling rate. Returns None on error.
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"""
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version = self["version"].value
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rate = self["sampling_rate"].value
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try:
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return self.SAMPLING_RATES[version][rate]
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except (KeyError, IndexError):
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return None
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def getBitRate(self):
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"""
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Read bit rate in bit/sec. Returns None on error.
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"""
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layer = 3 - self["layer"].value
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bit_rate = self["bit_rate"].value
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if bit_rate in (0, 15):
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return None
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if self["version"].value == 3:
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dataset = self.BIT_RATES[1] # MPEG1
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else:
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dataset = self.BIT_RATES[2] # MPEG2 / MPEG2.5
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try:
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return dataset[layer][bit_rate] * 1000
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except (KeyError, IndexError):
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return None
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def getFrameSize(self):
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"""
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Read frame size in bytes. Returns None on error.
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"""
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frame_size = self.getBitRate()
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if not frame_size:
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return None
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sample_rate = self.getSampleRate()
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if not sample_rate:
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return None
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padding = int(self["use_padding"].value)
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if self["layer"].value == self.LAYER_III:
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if self["version"].value == self.MPEG_I:
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return (frame_size * 144) // sample_rate + padding
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else:
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return (frame_size * 72) // sample_rate + padding
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elif self["layer"].value == self.LAYER_II:
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return (frame_size * 144) // sample_rate + padding
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else: # self.LAYER_I:
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frame_size = (frame_size * 12) // sample_rate
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return (frame_size + padding) * 4
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def getNbChannel(self):
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return self.NB_CHANNEL[self["channel_mode"].value]
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def createDescription(self):
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info = ["layer %s" % self["layer"].display]
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bit_rate = self.getBitRate()
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if bit_rate:
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info.append("%s/sec" % humanBitSize(bit_rate))
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sampling_rate = self.getSampleRate()
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if sampling_rate:
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info.append(humanFrequency(sampling_rate))
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return "MPEG-%s %s" % (self["version"].display, ", ".join(info))
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def findSynchronizeBits(parser, start, max_size):
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"""
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Find synchronisation bits (11 bits set to 1)
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Returns None on error, or number of bytes before the synchronization.
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"""
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address0 = parser.absolute_address
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end = start + max_size
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size = 0
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while start < end:
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# Fast search: search 0xFF (first byte of sync frame field)
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length = parser.stream.searchBytesLength(b"\xff", False, start, end)
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if length is None:
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return None
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size += length
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start += length * 8
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# Strong validation of frame: create the frame
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# and call method isValid()
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try:
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frame = createOrphanField(parser, start - address0, Frame, "frame")
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valid = frame.isValid()
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except Exception:
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valid = False
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if valid:
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return size
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# Invalid frame: continue
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start += 8
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size += 1
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return None
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class Frames(FieldSet):
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# Padding bytes allowed before a frame
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MAX_PADDING = 256
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def synchronize(self):
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addr = self.absolute_address
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start = addr + self.current_size
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end = min(start + self.MAX_PADDING * 8, addr + self.size)
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padding = findSynchronizeBits(self, start, end)
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if padding is None:
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raise ParserError(
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"MPEG audio: Unable to find synchronization bits")
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if padding:
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return PaddingBytes(self, "padding[]", padding, "Padding before synchronization")
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else:
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return None
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def looksConstantBitRate(self, count=10):
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"""
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Guess if frames are constant bit rate. If it returns False, you can
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be sure that frames are variable bit rate. Otherwise, it looks like
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constant bit rate (on first count fields).
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"""
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check_keys = ("version", "layer", "bit_rate")
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last_field = None
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for index, field in enumerate(self.array("frame")):
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if last_field:
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for key in check_keys:
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if field[key].value != last_field[key].value:
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return False
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last_field = field
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if index == count:
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break
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return True
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def createFields(self):
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# Find synchronisation bytes
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padding = self.synchronize()
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if padding:
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yield padding
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while self.current_size < self.size:
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yield Frame(self, "frame[]")
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# padding = self.synchronize()
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# if padding:
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# yield padding
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# Read raw bytes at the end (if any)
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size = (self.size - self.current_size) // 8
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if size:
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yield RawBytes(self, "raw", size)
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def createDescription(self):
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if self.looksConstantBitRate():
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text = "(looks like) Constant bit rate (CBR)"
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else:
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text = "Variable bit rate (VBR)"
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return "Frames: %s" % text
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def createMpegAudioMagic():
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# ID3v1 magic
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magics = [(b"TAG", 0)]
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# ID3v2 magics
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for ver_major in ID3v2.VALID_MAJOR_VERSIONS:
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magic = b"ID3%c\x00" % ver_major
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magics.append((magic, 0))
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# MPEG frame magic
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# TODO: Use longer magic: 32 bits instead of 16 bits
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SYNC_BITS = 2047
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for version in Frame.VERSION_NAME.keys():
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for layer in Frame.LAYER_NAME.keys():
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for crc16 in (0, 1):
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magic = (SYNC_BITS << 5) | (
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version << 3) | (layer << 1) | crc16
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magic = long2raw(magic, BIG_ENDIAN, 2)
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magics.append((magic, 0))
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return magics
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class MpegAudioFile(Parser):
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PARSER_TAGS = {
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"id": "mpeg_audio",
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"category": "audio",
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"file_ext": ("mpa", "mp1", "mp2", "mp3"),
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"mime": ("audio/mpeg",),
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"min_size": 4 * 8,
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# "magic": createMpegAudioMagic(),
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"description": "MPEG audio version 1, 2, 2.5",
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"subfile": "skip",
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}
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endian = BIG_ENDIAN
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def validate(self):
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if self[0].name in ("id3v2", "id3v1"):
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return True
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if not self.stream.checked: # TODO: is it possible to handle piped input?
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return False
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# Validate first 5 frames
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for index in range(5):
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try:
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frame = self["frames/frame[%u]" % index]
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except MissingField:
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# Require a least one valid frame
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if (1 <= index) \
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and self["frames"].done:
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return True
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return "Unable to get frame #%u" % index
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except (InputStreamError, ParserError):
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return "Unable to create frame #%u" % index
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# Check first frame values
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if not frame.isValid():
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return "Frame #%u is invalid" % index
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# Check that all frames are similar
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if not index:
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frame0 = frame
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else:
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if frame0["channel_mode"].value != frame["channel_mode"].value:
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return "Frame #%u channel mode is different" % index
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return True
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def createFields(self):
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# Read ID3v2 (if any)
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if self.stream.readBytes(0, 3) == b"ID3":
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yield ID3v2(self, "id3v2")
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if self._size is None: # TODO: is it possible to handle piped input?
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raise NotImplementedError
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# Check if file is ending with ID3v1 or not and compute frames size
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frames_size = self.size - self.current_size
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addr = self.size - 128 * 8
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if 0 <= addr:
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has_id3 = (self.stream.readBytes(addr, 3) == b"TAG")
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if has_id3:
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frames_size -= 128 * 8
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else:
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has_id3 = False
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# Read frames (if any)
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if frames_size:
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yield Frames(self, "frames", size=frames_size)
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# Read ID3v1 (if any)
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if has_id3:
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yield ID3v1(self, "id3v1")
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def createDescription(self):
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if "frames" in self:
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frame = self["frames/frame[0]"]
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return "%s, %s" % (frame.description, frame["channel_mode"].display)
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elif "id3v2" in self:
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return self["id3v2"].description
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elif "id3v1" in self:
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return self["id3v1"].description
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else:
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return "MPEG audio"
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def createContentSize(self):
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# Get "frames" field
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field = self[0]
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if field.name != "frames":
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try:
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field = self[1]
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except MissingField:
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# File only contains ID3v1 or ID3v2
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return field.size
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# Error: second field are not the frames"?
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if field.name != "frames":
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return None
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# Go to last frame
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frames = field
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frame = frames["frame[0]"]
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address0 = field.absolute_address
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size = address0 + frame.size
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while True:
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try:
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# Parse one MPEG audio frame
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frame = createOrphanField(
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frames, size - address0, Frame, "frame")
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# Check frame 32 bits header
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if not frame.isValid():
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break
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except Exception:
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break
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if MAX_FILESIZE < (size + frame.size):
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break
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size += frame.size
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# ID3v1 at the end?
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try:
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if self.stream.readBytes(size, 3) == b"TAG":
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size += ID3v1.static_size
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except InputStreamError:
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pass
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return size
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