From: Alexandra Hájková <[email protected]>
Do not prefetch data too often for short codes.
---
libavcodec/golomb.h | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/libavcodec/golomb.h b/libavcodec/golomb.h
index cbb5d12..2daedf6 100644
--- a/libavcodec/golomb.h
+++ b/libavcodec/golomb.h
@@ -105,18 +105,19 @@ static inline unsigned
get_interleaved_ue_golomb(BitstreamContext *bc)
{
uint32_t buf;
- buf = bitstream_peek(bc, 32);
+ buf = bitstream_peek(bc, 9);
- if (buf & 0xAA800000) {
- buf >>= 32 - 8;
+ if (buf & 0x155) {
+ buf >>= 1;
bitstream_skip(bc, ff_interleaved_golomb_vlc_len[buf]);
return ff_interleaved_ue_golomb_vlc_code[buf];
} else {
- unsigned ret = 1;
+ unsigned ret = (1 << 4) | ff_interleaved_dirac_golomb_vlc_code[buf >>
1];
+ bitstream_skip(bc, 8);
+ buf = bitstream_peek(bc, 8);
do {
- buf >>= 32 - 8;
bitstream_skip(bc, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
if (ff_interleaved_golomb_vlc_len[buf] != 9) {
@@ -125,7 +126,7 @@ static inline unsigned
get_interleaved_ue_golomb(BitstreamContext *bc)
break;
}
ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
- buf = bitstream_peek(bc, 32);
+ buf = bitstream_peek(bc, 8);
} while (bitstream_bits_left(bc) > 0);
return ret - 1;
--
2.1.4
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