SoC 2010/High Bit Depth Encoding

This project is part of Google Summer of Code 2010. Student: Oskar Arvidsson Mentor: Holger Lubitz

Abstract

The primary goal for this project is to prepare the code base of x264 for encoding H.264 video with user defined sample depths. This will involve templating the encoder and migrating existing C code for use with higher sample depths.

A lot of optimizations are done with assembly, and will thus also need to be migrated. The secondary goal for this project is therefore to identify new assembly code to be written.

Milestones

Status	Deadline	Description
Done	May 30	16-bit infrastructure ready for testing
No problems encountered so far	June 6	Encoding with 16-bit infrastructure produce same results as 8-bit infrastructure.

Timeline

This schedule is preliminary.

Status	Date	Period	Description
Done	May 17 - May 23	Week 1	Identify C code that should be templated.
Done	May 24 - May 30	Week 2	Start templating the encoder for 16-bit infrastructure.
In progress	May 31 - June 6	Week 3	Test templated encoder. Identify C code that need modification to support higher sample depth.
Not started	June 7 - June 13	Week 4	Start modifying the encoder to support higher sample depth.
Not started	June 14 - June 20	Week 5	Continue work with encoder.
Not started	June 21 - June 27	Week 6	Continue work with encoder.
Not started	June 28 - July 4		Vacation
Not started	July 5 - July 11		Vacation
Not started	July 12 - July 18	Week 7	Test encoder with higher sample depths.
Not started	July 19 - July 25	Week 8	Fix issues encountered during testing.
Not started	July 26 - August 1	Week 9	Modify build chain to allow compilation for higher sample depth. Add options to set sample rate.
Not started	August 2 - August 8	Week 10	Identify assembly code that needs modification to support higher sample depth.

Repository

• http://github.com/irock/x264-high-bit-encoding/tree/high-bit-encoding

How to test the current code:

 $ git clone git://github.com/irock/x264-high-bit-encoding.git
 $ cd x264-high-bit-encoding
 $ git checkout high-bit-encoding
 $ ./configure --disable-asm --enable-16-bit
 $ make