This proved beneficial for performance: For the sample [1] the number of decicycles in one decode call decreased from 155851561 to 108158037 for Clang 10 and from 168270467 to 128847479 for GCC 9.3. For x86-32 compiled with GCC 9.3 and run on an x64 Haswell the number increased from 158405517 to 202215769, so that the cached bitstream reader is only enabled if HAVE_FAST_64BIT is set. These values are the average of 10 runs each looping five times over the input.
[1]: samples.ffmpeg.org/ffmpeg-bugs/trac/ticket2593/fraps_flv1_decoding_errors.avi Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com> --- libavcodec/fraps.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/fraps.c b/libavcodec/fraps.c index 00fd63ffec..8d01b44f11 100644 --- a/libavcodec/fraps.c +++ b/libavcodec/fraps.c @@ -31,6 +31,9 @@ * Version 2 files support by Konstantin Shishkov */ +#include "config.h" + +#define CACHED_BITSTREAM_READER HAVE_FAST_64BIT #define UNCHECKED_BITSTREAM_READER 1 #include "avcodec.h" #include "get_bits.h" -- 2.25.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
