Changeset 9b538537 in ffmpeg

Timestamp:

Jun 1, 2014, 10:47:54 PM (11 years ago)

Author:

Michael Niedermayer <michaelni@gmx.at>

Branches:

master

Children:

2c23f87c

Parents:

e91f27cb

git-author:

Ronald S. Bultje <rsbultje@gmail.com> (05/27/14 00:38:18)

git-committer:

Michael Niedermayer <michaelni@gmx.at> (06/01/14 22:47:54)

Message:

Rewrite main resampling loop (common and linear).

This removes a branch at a performance-sensitive point (in the middle
of the loop). In fate-swr-resample-s32p-8000-2626, this makes the code
about 10% faster. It also simplifies the loops, allowing us to rewrite
it in yasm at some later point.

The compensation_distance != 0 code and index < 0 code are still kind
of hairy. For compensation_distance != 0, this should likely be handled
in the caller, so that it calls swri_resample twice (once until the
dst_incr switch-point, and once with the remainder of the samples). For
index < 0, the code should probably be rewritten to break out of the
loop once sample_index >= 0, and then resume (e.g. as a tail-call) to
the common or linear resampling loops.

Signed-off-by: Michael Niedermayer <​michaelni@gmx.at>

(No files)