Pylibdv

= Welcome to pylibdv 0.1 =

[[PageOutline]]

== Background ==

pylibdv is a project for one of my university courses; [http://www.uio.no/studier/emner/matnat/ifi/INF5660/index-eng.xml INF5660 - Advanced problem solving with high level languages].

pylibdv is a python wrapper for [http://libdv.sourceforge.net/ libdv].[[BR]]

From libdv home page: "libdv is a software codec for DV video, the encoding format used by most digital camcorders, typically those that support the IEEE 1394 Firewire or i.Link) interface. Libdv was developed according to the official standards for DV video: IEC 61834 and SMPTE 314M."

== Overview of package ==

{{{

pylibdv-0.1/src/pylibdv.c

pylibdv-0.1/src/pylibdv.h

pylibdv-0.1/frame_viewer/frame-viewer.py

pylibdv-0.1/example/parse_decode.py

pylibdv-0.1/dv/test.dv

pylibdv-0.1/testing.py

pylibdv-0.1/setup.py

pylibdv-0.1/README

}}}

== Requirements ==

libdv 1.4 (works with debian package 0.104-2 from debian repository)[[BR]]

python >= 2.4 (testing.py won't work with 2.3, doctest will fail due to a bug in 2.3)[[BR]]

gcc[[BR]]

== Known bugs ==

libdv seg-faults on some versions of the libdv library. There seems to be a bug in the asm-optimization, so a quick work-around if this occurs is to turn off asm-optimization.

== Progress ==

So far the following is available:[[BR]]

pylibdv:

  Constants:

    DV_QUALITY_BEST[[BR]]

    DV_QUALITY_FASTEST[[BR]]

    DV_QUALITY_COLOR[[BR]]

    DV_QUALITY_DC[[BR]]

    DV_QUALITY_AC_1[[BR]]

    DV_QUALITY_AC_2[[BR]]

    DV_QUALITY_AC_MASK[[BR]]

    e_dv_color_rgb[[BR]]

    e_dv_color_yuv[[BR]]

    e_dv_color_bgr0[[BR]]

  Object:

    Decoder[[BR]]

      Methods:

        parse_header()[[BR]]

        decode_full_frame()[[BR]]

      Data:

        frame_size (read only)[[BR]]

        width (read only)[[BR]]

        length (read only)[[BR]]

        quality (read & write)[[BR]]

This project is ongoing and most functions will be wrapped by the end of the summer (depending on need).

== Simple example ==

{{{

import pylibdv

decoder = pylibdv.Decoder(ignored=1, clamp_luma=1, clamp_chroma=1) 

file = open("somedvfile.dv,"r")

framebuffer = file.read(120000) # Just enough to make sure

decoder.parse_header(framebuffer)

# Now we can get some information about the video

frame_size = decoder.frame_size

width = decoder.width

height = decoder.height

file.seek(0) #Back to start

framebuffer = file.read(frame_size)

rgb_buffer = decoder.decode_full_frame(framebuffer)

#Now the rgb buffer can be drawn to screen, check out gtk package

}}}

Enjoy! [[BR]]

[mailto:nielsr@ifi.uio.no Niels Petter Rasch-Olsen]