oxtimeline/oxgst/info.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
# GPL 2008
import gobject
gobject.threads_init()

import os
import pygst
pygst.require("0.10")
import gst
from gst.extend import discoverer


codec_list = {
    'MPEG-1 layer 3': 'MPEG-1 Audio layer 3',
    'MPEG-1 layer 3 audio': 'MPEG-1 Audio layer 3',
    'MPEG 1 Audio, Layer 2': 'MPEG-1 Audio layer 2',
    'VP6 Flash video': 'VP6',
    'AC-3 audio': 'AC-3',
    'Uncompressed 16-bit PCM audio': 'Uncompressed 16-bit PCM',
    'Generic DV': 'DV Video',
}

class Info(dict):
    def __init__(self, path):
        self['size'] = os.stat(path).st_size
        mainloop = gobject.MainLoop()
        def discovered(d, is_media):
            if is_media:
                if d.is_video:
                    #self['video caps'] = d.videocaps
                    #self['framerate (fps)'] = '%s:%s' % (d.videorate.num, d.videorate.denom)
                    self['width'] = d.videowidth
                    self['height'] = d.videoheight
                    self['duration'] = d.videolength/gst.MSECOND
                    self['framerate'] = float(d.videorate)
                    s = d.videocaps[0]
                    if 'pixel-aspect-ratio' in s.keys():
                        self["pixel-aspect-ratio"] = "%d:%d" % (s['pixel-aspect-ratio'].num, s['pixel-aspect-ratio'].denom)
                if d.is_audio:
                    #self['audio caps'] = d.audiocaps
                    #self['audio format'] = d.audiofloat and 'floating-point' or 'integer'
                    #self['sample width (bits)'] = d.audiowidth
                    #self['sample depth (bits)'] = d.audiodepth
                    self['samplerate'] = d.audiorate
                    if 'duration' not in self:
                        self['duration'] = d.audiolength/gst.MSECOND
                    self['channels'] = d.audiochannels

                if 'video-codec' in d.tags:
                    self['video-codec'] = codec_list.get(d.tags['video-codec'], d.tags['video-codec'])
                if 'audio-codec' in d.tags:
                    self['audio-codec'] = codec_list.get(d.tags['audio-codec'], d.tags['audio-codec'])
            mainloop.quit()

        d = discoverer.Discoverer(path)
        d.connect('discovered', discovered)
        d.discover()
        mainloop.run()