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| author | Jason Garrett-Glaser <darkshikari@gmail.com> | 2010-08-12 01:11:32 +0000 |
|---|---|---|
| committer | Jason Garrett-Glaser <darkshikari@gmail.com> | 2010-08-12 01:11:32 +0000 |
| commit | 05c04cdf54fee9332d337380fd4cd8502bdac2be (patch) | |
| tree | a34738cea5f0b5286f5f31c996c8f634361cc31c /libavcodec/vp56rac.c | |
| parent | d2064fd42b2dd1cf1c44e5c4fc4b8aaba6698637 (diff) | |
| download | ffmpeg-05c04cdf54fee9332d337380fd4cd8502bdac2be.tar.gz | |
VP5/6/8: ~7% faster arithmetic decoding
Grab from the bitstream in 16-bit chunks instead of 8-bit chunks.
TODO: grab in 32-bit chunks on 64-bit systems.
Originally committed as revision 24783 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vp56rac.c')
| -rw-r--r-- | libavcodec/vp56rac.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/vp56rac.c b/libavcodec/vp56rac.c index 752a42bc6b..f11531de24 100644 --- a/libavcodec/vp56rac.c +++ b/libavcodec/vp56rac.c @@ -40,8 +40,8 @@ const uint8_t ff_vp56_norm_shift[256]= { void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size) { c->high = 255; - c->bits = -8; + c->bits = -16; c->buffer = buf; c->end = buf + buf_size; - c->code_word = bytestream_get_be16(&c->buffer); + c->code_word = bytestream_get_be24(&c->buffer); } |