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._stream_id = 0
        self['video'] = []
        self['audio'] = []
        self['size'] = os.stat(path).st_size
        mainloop = gobject.MainLoop()
        def discovered(d, is_media):
            if is_media:
                if d.is_video:
                    c = {}
                    c['width'] = d.videowidth
                    c['height'] = d.videoheight
                    self['duration'] = float(d.videolength)/gst.SECOND
                    c["framerate"] = "%d:%d" % (d.videorate.num, d.videorate.denom)
                    s = d.videocaps[0]
                    par = gst.Fraction(1, 1)
                    if 'pixel-aspect-ratio' in s.keys():
                        par = s['pixel-aspect-ratio']
                    c["pixel_aspect_ratio"] = "%s:%s" %(par.num, par.denom)
                    dar = gst.Fraction(d.videowidth * par.num, d.videoheight * par.denom)
                    if 'display-aspect-ratio' in s.keys():
                        dar = s['display-aspect-ratio']
                    c["display_aspect_ratio"] = "%s:%s" %(dar.num, dar.denom)
                    if 'video-codec' in d.tags:
                        c['codec'] = codec_list.get(d.tags['video-codec'], d.tags['video-codec'])
                    c['id'] = self._stream_id
                    self._stream_id += 1
                    self['video'].append(c)
                if d.is_audio:
                    c = {}
                    #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
                    c['samplerate'] = d.audiorate
                    if 'duration' not in self:
                        self['duration'] = float(d.audiolength)/gst.SECOND
                    c['channels'] = d.audiochannels

                    if 'audio-codec' in d.tags:
                        c['codec'] = codec_list.get(d.tags['audio-codec'], d.tags['audio-codec'])
                    c['id'] = self._stream_id
                    self._stream_id += 1
                    self['audio'].append(c)
            mainloop.quit()

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