From 0161d91db01ae0b5d516232d92764f5a898cedc6 Mon Sep 17 00:00:00 2001 From: James Almer Date: Mon, 23 Apr 2018 23:39:54 -0300 Subject: [PATCH] avcodec/cbs_mpeg2: use memcpy when assembling fragments 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. Reviewed-by: Michael Niedermayer Signed-off-by: James Almer --- 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);