Changes between Version 5 and Version 6 of SponsoringPrograms/GSoC/2014


Ignore:
Timestamp:
Jan 30, 2014, 11:37:46 PM (5 years ago)
Author:
michael
Comment:

postproc optims and bayer RGB

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  • SponsoringPrograms/GSoC/2014

    v5 v6  
    108108'''Backup Mentor:''' TBA, possibly Nicolas George (Cigaes on IRC)
    109109
     110== Postproc optimizations ==
     111Image:PostProc.jpg
     112
     113'''Description:''' FFmpeg contains libpostproc, which is used to postprocess 8x8 DCT-MC based video and images (jpeg, mpeg-1/2/4, H.263 among others). The code though has been written a long time ago and its SIMD optimizations need to be updated to what modern CPUs support (AVX2 and SSE2+).
     114
     115'''Expected results:'''
     116
     117   - Convert all gcc inline asm in libpostproc to YASM.
     118   - Restructure the code so that it works with block sizes compatible with modern SIMD.
     119   - Add Integer SSE2 and AVX2 optimizations for each existing MMX/MMX2/3dnow optimization in libpostproc.
     120
     121'''Prerequisites:''' C coding skills, good x86 assembly coding skills, familiarity with git/source code control systems.
     122
     123'''Qualification Task:''' convert 1 or 2 MMX2 functions to SSE2 and AVX2.
     124
     125'''Mentor:''' Michael Niedermayer (michaelni on IRC)
     126
     127'''Backup Mentor:''' TBA, possibly Stefano Sabatini (saste on IRC)
     128
     129
     130== Bayer RGB colorspaces ==
     131Image:350px-Bayer_pattern_on_sensor.svg.png
     132
     133'''Description:''' Several image and video format store pixels using Bayer-pattern colorspaces. Supporting these format would broaden FFmpeg's applicability to RAW still and video photography processing.
     134
     135'''Expected Results:'''
     136
     137   - Rebase existing patches
     138   - Implement high quality bayer transformations in libswscale (plain C)
     139   - Add bayer formats to the libavutil pixfmt enumeration routines
     140   - SIMD optimizations of the libswscale transformations
     141   - Complete PhotoCINE demuxer to support Bayer format; (or another format of your choosing)
     142
     143Optional goodies:
     144
     145  - Extend TIFF decoder to support DNG-Bayer format
     146  - Support a popular proprietary camera format (many to choose from; see dcraw project)
     147
     148'''Prerequisites:''' C coding skills, familiarity with git/source code control systems.
     149
     150'''Qualification Task:''' Implement a simple and working Bayer->RGB transform in libswscale
     151
     152'''Mentor:''' TBA, possibly Peter Ross (pross-au on IRC)
     153
     154'''Backup Mentor:''' Michael Niedermayer (michaelni on IRC)
     155
     156
    110157
    111158== Sample Project ==