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Viewing changes to pitivi/elements/thumbnailsink.py

  • Committer: Package Import Robot
  • Author(s): Sebastian Dröge
  • Date: 2014-04-05 15:28:16 UTC
  • mfrom: (6.1.13 sid)
  • Revision ID: package-import@ubuntu.com-20140405152816-6lijoax4cngiz5j5
Tags: 0.93-3
http://bugs.debian.org/732813
http://bugs.debian.org/743692
* debian/control:
  + Depend on python-gi (>= 3.10), older versions do not work
    with pitivi (Closes: #732813).
  + Add missing dependency on gir1.2-clutter-gst-2.0 (Closes: #743692).
  + Add suggests on gir1.2-notify-0.7 and gir1.2-gnomedesktop-3.0.

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pitivi/elements/thumbnailsink.py
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# PiTiVi , Non-linear video editor
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#
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#       pitivi/elements/thumbnailsink.py
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#
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# Copyright (c) 2005, Edward Hervey <bilboed@bilboed.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This program 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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"""
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GdkPixbuf thumbnail sink
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"""
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import gobject
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import gst
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import cairo
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import array
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from pitivi.utils import big_to_cairo_alpha_mask, big_to_cairo_red_mask, big_to_cairo_green_mask, big_to_cairo_blue_mask
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class CairoSurfaceThumbnailSink(gst.BaseSink):
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    """
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    GStreamer thumbnailing sink element.
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    Can be used in pipelines to generates gtk.gdk.Pixbuf automatically.
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    """
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    __gsignals__ = {
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        "thumbnail": (gobject.SIGNAL_RUN_LAST,
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                      gobject.TYPE_NONE,
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                      (gobject.TYPE_PYOBJECT, gobject.TYPE_UINT64))
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        }
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    __gsttemplates__ = (
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        gst.PadTemplate("sink",
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                         gst.PAD_SINK,
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                         gst.PAD_ALWAYS,
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                         gst.Caps("video/x-raw-rgb,"
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                                  "bpp = (int) 32, depth = (int) 32,"
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                                  "endianness = (int) BIG_ENDIAN,"
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                                  "alpha_mask = (int) %i, "
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                                  "red_mask = (int)   %i, "
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                                  "green_mask = (int) %i, "
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                                  "blue_mask = (int)  %i, "
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                                  "width = (int) [ 1, max ], "
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                                  "height = (int) [ 1, max ], "
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                                  "framerate = (fraction) [ 0, max ]"
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                                  % (big_to_cairo_alpha_mask,
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                                     big_to_cairo_red_mask,
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                                     big_to_cairo_green_mask,
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                                     big_to_cairo_blue_mask)))
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        )
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    def __init__(self):
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        gst.BaseSink.__init__(self)
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        self._width = 1
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        self._height = 1
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        self.set_sync(False)
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    def do_set_caps(self, caps):
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        self.log("caps %s" % caps.to_string())
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        self.log("padcaps %s" % self.get_pad("sink").get_caps().to_string())
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        self.width = caps[0]["width"]
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        self.height = caps[0]["height"]
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        if not caps[0].get_name() == "video/x-raw-rgb":
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            return False
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        return True
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    def do_render(self, buf):
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        self.log("buffer %s %d" % (gst.TIME_ARGS(buf.timestamp),
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                                   len(buf.data)))
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        b = array.array("b")
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        b.fromstring(buf)
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        pixb = cairo.ImageSurface.create_for_data(b,
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            # We don't use FORMAT_ARGB32 because Cairo uses premultiplied
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            # alpha, and gstreamer does not.  Discarding the alpha channel
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            # is not ideal, but the alternative would be to compute the
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            # conversion in python (slow!).
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            cairo.FORMAT_RGB24,
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            self.width,
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            self.height,
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            self.width * 4)
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        self.emit('thumbnail', pixb, buf.timestamp)
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        return gst.FLOW_OK
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    def do_preroll(self, buf):
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        return self.do_render(buf)
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gobject.type_register(CairoSurfaceThumbnailSink)