Author: dmeyer
Date: Thu Dec 7 15:53:09 2006
New Revision: 2175
Added:
trunk/metadata/src/video/flvinfo.py
Modified:
trunk/metadata/src/factory.py
Log:
add flash video parser
Modified: trunk/metadata/src/factory.py
==============================================================================
--- trunk/metadata/src/factory.py (original)
+++ trunk/metadata/src/factory.py Thu Dec 7 15:53:09 2006
@@ -117,6 +117,7 @@
import video.mpeginfo
import video.asfinfo
import video.movinfo
+ import video.flvinfo
import image.jpginfo
import image.pnginfo
import image.tiffinfo
Added: trunk/metadata/src/video/flvinfo.py
==============================================================================
--- (empty file)
+++ trunk/metadata/src/video/flvinfo.py Thu Dec 7 15:53:09 2006
@@ -0,0 +1,119 @@
+# -*- coding: iso-8859-1 -*-
+# -----------------------------------------------------------------------------
+# flvinfo.py - parser for flash video files
+# -----------------------------------------------------------------------------
+# $Id$
+#
+# -----------------------------------------------------------------------------
+# kaa-Metadata - Media Metadata for Python
+# Copyright (C) 2003-2006 Thomas Schueppel, Dirk Meyer
+#
+# First Edition: Dirk Meyer <[EMAIL PROTECTED]>
+# Maintainer: Dirk Meyer <[EMAIL PROTECTED]>
+#
+# Please see the file AUTHORS for a complete list of authors.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MER-
+# CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+# -----------------------------------------------------------------------------
+
+# python imports
+import struct
+import string
+import logging
+
+# kaa imports
+from kaa.metadata import mediainfo
+from kaa.metadata import factory
+
+# get logging object
+log = logging.getLogger('metadata')
+
+FLV_TAG_TYPE_AUDIO = 0x08
+FLV_TAG_TYPE_VIDEO = 0x09
+FLV_TAG_TYPE_META = 0x12
+
+# audio flags
+FLV_AUDIO_CHANNEL_MASK = 0x01
+FLV_AUDIO_SAMPLERATE_MASK = 0x0c
+FLV_AUDIO_CODECID_MASK = 0xf0
+
+FLV_AUDIO_SAMPLERATE_OFFSET = 2
+FLV_AUDIO_CODECID_OFFSET = 4
+FLV_AUDIO_CODECID = ( 0x0001, 0x0002, 0x0055, 0x0001 )
+
+# video flags
+FLV_VIDEO_CODECID_MASK = 0x0f
+FLV_VIDEO_CODECID = ( 'FLV1', 'MSS1', 'VP60') # wild guess
+
+
+class FlashInfo(mediainfo.AVInfo):
+ def __init__(self,file):
+ mediainfo.AVInfo.__init__(self)
+ self.context = 'video'
+ self.mime = 'video/flv'
+ self.type = 'Flash Video'
+ header = struct.unpack('>3sBBII', file.read(13))
+ if not header[0] == 'FLV':
+ raise mediainfo.KaaMetadataParseError()
+
+ for i in range(10):
+ if self.audio and self.video:
+ break
+ data = file.read(11)
+ if len(data) < 11:
+ break
+ chunk = struct.unpack('>BH4BI', data)
+ size = (chunk[1] << 8) + chunk[2]
+
+ if chunk[0] == FLV_TAG_TYPE_AUDIO:
+ flags = ord(file.read(1))
+ if not self.audio:
+ a = mediainfo.AudioInfo()
+ a.channels = (flags & FLV_AUDIO_CHANNEL_MASK) + 1
+ srate = (flags & FLV_AUDIO_SAMPLERATE_MASK)
+ a.samplerate = (44100 << (srate >>
FLV_AUDIO_SAMPLERATE_OFFSET) >> 3)
+ codec = (flags & FLV_AUDIO_CODECID_MASK) >>
FLV_AUDIO_CODECID_OFFSET
+ if codec < len(FLV_AUDIO_CODECID):
+ a.codec = FLV_AUDIO_CODECID[codec]
+ self.audio.append(a)
+
+ file.seek(size - 1, 1)
+
+ elif chunk[0] == FLV_TAG_TYPE_VIDEO:
+ flags = ord(file.read(1))
+ if not self.video:
+ v = mediainfo.VideoInfo()
+ codec = (flags & FLV_VIDEO_CODECID_MASK) - 2
+ if codec < len(FLV_VIDEO_CODECID):
+ v.codec = FLV_VIDEO_CODECID[codec]
+ # width and height are in the meta packet, but I have
+ # no file with such a packet inside. So maybe we have
+ # to decode some parts of the video.
+ self.video.append(v)
+
+ file.seek(size - 1, 1)
+
+ elif chunk[0] == FLV_TAG_TYPE_META:
+ log.info('metadata %s', str(chunk))
+ file.seek(size, 1)
+
+ else:
+ log.info('unkown %s', str(chunk))
+ file.seek(size, 1)
+
+ file.seek(4, 1)
+
+factory.register( 'video/flv', ('flv',), mediainfo.TYPE_AV, FlashInfo )
-------------------------------------------------------------------------
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