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videoconverter.py

# -*- coding: utf-8 -*-
# Copyright (C) 2010 Holoscopio Tecnologia
# Author: Luciana Fujii Pontello <luciana@holoscopio.com>
#
# 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
# MERCHANTABILITY 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import gobject
import pygst
pygst.require("0.10")
import gst
from utils import Fract

00025 class VideoConverter(gst.Bin):

    def __init__(self):
        gst.Bin.__init__(self)
        self.colorspace = gst.element_factory_make(
                "ffmpegcolorspace", "videoconvert_colorspace"
        )
        self.add(self.colorspace)

        self.videorate = gst.element_factory_make(
                "videorate", "videoconvert_videorate"
        )
        self.add(self.videorate)

        self.videoscale = gst.element_factory_make(
                "videoscale", "videoconvert_videoscale"
        )
        self.add(self.videoscale)
        self.videoscale.set_property("method", 1)

        self.capsfilter = gst.element_factory_make(
                "capsfilter", "videoconvert_capsfilter"
        )
        self.add(self.capsfilter)

        gst.element_link_many(
                self.colorspace, self.videorate, self.videoscale,
                self.capsfilter
        )

        self.source_pad = gst.GhostPad(
                "src", self.capsfilter.src_pads().next()
        )
        self.add_pad(self.source_pad)
        self.sink_pad = gst.GhostPad(
                "sink", self.colorspace.sink_pads().next()
        )
        self.add_pad(self.sink_pad)

    def config(self, dict):
        num, den = Fract.fromdecimal(dict["framerate"])
        caps = gst.caps_from_string(
                "video/x-raw-yuv, width=%d, height=%d, framerate=%d/%d" % (
                    int(dict["width"]), int(dict["height"]), num, den
                )
        )
        self.capsfilter.set_property("caps", caps)

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