[FFmpeg-devel] [PATCH] avcodec/cbs_mpeg2: use memcpy when assembling fragments
James Almer
jamrial at gmail.com
Tue Apr 24 05:39:54 EEST 2018
before:
419022 decicycles in assemble_fragment, 2047 runs, 1 skips
after:
104621 decicycles in assemble_fragment, 2045 runs, 3 skips
Benched with a 2 minutes long 720x480 DVD mpeg2 sample.
Signed-off-by: James Almer <jamrial at gmail.com>
---
libavcodec/cbs_mpeg2.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/libavcodec/cbs_mpeg2.c b/libavcodec/cbs_mpeg2.c
index bfb64a0851..94b9591b21 100644
--- a/libavcodec/cbs_mpeg2.c
+++ b/libavcodec/cbs_mpeg2.c
@@ -362,7 +362,7 @@ static int cbs_mpeg2_assemble_fragment(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag)
{
uint8_t *data;
- size_t size, dp, sp;
+ size_t size, dp;
int i;
size = 0;
@@ -382,8 +382,8 @@ static int cbs_mpeg2_assemble_fragment(CodedBitstreamContext *ctx,
data[dp++] = 0;
data[dp++] = 1;
- for (sp = 0; sp < unit->data_size; sp++)
- data[dp++] = unit->data[sp];
+ memcpy(data + dp, unit->data, unit->data_size);
+ dp += unit->data_size;
}
av_assert0(dp == size);
--
2.17.0
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