182 lines
6.2 KiB
Python
182 lines
6.2 KiB
Python
# -*- coding: utf-8 -*-
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# enzyme - Video metadata parser
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# Copyright 2011-2012 Antoine Bertin <diaoulael@gmail.com>
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# Copyright 2003-2006 Dirk Meyer <dischi@freevo.org>
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#
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# This file is part of enzyme.
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#
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# enzyme is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# enzyme is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with enzyme. If not, see <http://www.gnu.org/licenses/>.
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from exceptions import ParseError
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import core
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import logging
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import struct
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__all__ = ['Parser']
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# get logging object
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log = logging.getLogger(__name__)
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FLV_TAG_TYPE_AUDIO = 0x08
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FLV_TAG_TYPE_VIDEO = 0x09
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FLV_TAG_TYPE_META = 0x12
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# audio flags
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FLV_AUDIO_CHANNEL_MASK = 0x01
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FLV_AUDIO_SAMPLERATE_MASK = 0x0c
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FLV_AUDIO_CODECID_MASK = 0xf0
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FLV_AUDIO_SAMPLERATE_OFFSET = 2
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FLV_AUDIO_CODECID_OFFSET = 4
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FLV_AUDIO_CODECID = (0x0001, 0x0002, 0x0055, 0x0001)
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# video flags
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FLV_VIDEO_CODECID_MASK = 0x0f
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FLV_VIDEO_CODECID = ('FLV1', 'MSS1', 'VP60') # wild guess
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FLV_DATA_TYPE_NUMBER = 0x00
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FLV_DATA_TYPE_BOOL = 0x01
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FLV_DATA_TYPE_STRING = 0x02
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FLV_DATA_TYPE_OBJECT = 0x03
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FLC_DATA_TYPE_CLIP = 0x04
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FLV_DATA_TYPE_REFERENCE = 0x07
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FLV_DATA_TYPE_ECMARRAY = 0x08
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FLV_DATA_TYPE_ENDOBJECT = 0x09
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FLV_DATA_TYPE_ARRAY = 0x0a
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FLV_DATA_TYPE_DATE = 0x0b
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FLV_DATA_TYPE_LONGSTRING = 0x0c
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FLVINFO = {
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'creator': 'copyright',
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}
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class FlashVideo(core.AVContainer):
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"""
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Experimental parser for Flash videos. It requires certain flags to
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be set to report video resolutions and in most cases it does not
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provide that information.
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"""
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table_mapping = { 'FLVINFO' : FLVINFO }
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def __init__(self, file):
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core.AVContainer.__init__(self)
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self.mime = 'video/flv'
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self.type = 'Flash Video'
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data = file.read(13)
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if len(data) < 13 or struct.unpack('>3sBBII', data)[0] != 'FLV':
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raise ParseError()
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for _ in range(10):
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if self.audio and self.video:
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break
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data = file.read(11)
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if len(data) < 11:
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break
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chunk = struct.unpack('>BH4BI', data)
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size = (chunk[1] << 8) + chunk[2]
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if chunk[0] == FLV_TAG_TYPE_AUDIO:
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flags = ord(file.read(1))
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if not self.audio:
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a = core.AudioStream()
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a.channels = (flags & FLV_AUDIO_CHANNEL_MASK) + 1
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srate = (flags & FLV_AUDIO_SAMPLERATE_MASK)
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a.samplerate = (44100 << (srate >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3)
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codec = (flags & FLV_AUDIO_CODECID_MASK) >> FLV_AUDIO_CODECID_OFFSET
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if codec < len(FLV_AUDIO_CODECID):
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a.codec = FLV_AUDIO_CODECID[codec]
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self.audio.append(a)
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file.seek(size - 1, 1)
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elif chunk[0] == FLV_TAG_TYPE_VIDEO:
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flags = ord(file.read(1))
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if not self.video:
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v = core.VideoStream()
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codec = (flags & FLV_VIDEO_CODECID_MASK) - 2
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if codec < len(FLV_VIDEO_CODECID):
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v.codec = FLV_VIDEO_CODECID[codec]
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# width and height are in the meta packet, but I have
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# no file with such a packet inside. So maybe we have
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# to decode some parts of the video.
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self.video.append(v)
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file.seek(size - 1, 1)
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elif chunk[0] == FLV_TAG_TYPE_META:
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log.info(u'metadata %r', str(chunk))
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metadata = file.read(size)
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try:
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while metadata:
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length, value = self._parse_value(metadata)
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if isinstance(value, dict):
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log.info(u'metadata: %r', value)
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if value.get('creator'):
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self.copyright = value.get('creator')
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if value.get('width'):
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self.width = value.get('width')
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if value.get('height'):
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self.height = value.get('height')
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if value.get('duration'):
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self.length = value.get('duration')
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self._appendtable('FLVINFO', value)
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if not length:
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# parse error
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break
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metadata = metadata[length:]
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except (IndexError, struct.error, TypeError):
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pass
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else:
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log.info(u'unkown %r', str(chunk))
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file.seek(size, 1)
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file.seek(4, 1)
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def _parse_value(self, data):
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"""
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Parse the next metadata value.
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"""
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if ord(data[0]) == FLV_DATA_TYPE_NUMBER:
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value = struct.unpack('>d', data[1:9])[0]
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return 9, value
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if ord(data[0]) == FLV_DATA_TYPE_BOOL:
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return 2, bool(data[1])
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if ord(data[0]) == FLV_DATA_TYPE_STRING:
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length = (ord(data[1]) << 8) + ord(data[2])
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return length + 3, data[3:length + 3]
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if ord(data[0]) == FLV_DATA_TYPE_ECMARRAY:
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init_length = len(data)
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num = struct.unpack('>I', data[1:5])[0]
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data = data[5:]
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result = {}
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for _ in range(num):
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length = (ord(data[0]) << 8) + ord(data[1])
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key = data[2:length + 2]
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data = data[length + 2:]
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length, value = self._parse_value(data)
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if not length:
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return 0, result
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result[key] = value
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data = data[length:]
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return init_length - len(data), result
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log.info(u'unknown code: %x. Stop metadata parser', ord(data[0]))
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return 0, None
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Parser = FlashVideo
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