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h264: don't store intra pcm samples in h->mb.

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Instead, keep them in the bitstream buffer until we read them verbatim,
this saves a memcpy() and a subsequent clearing of the target buffer.
decode_cabac+decode_mb for a sample file (CAPM3_Sony_D.jsv) goes from
6121.4 to 6095.5 cycles, i.e. 26 cycles faster.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Ronald S. Bultje
2013-02-17 14:52:24 -08:00
committed by Michael Niedermayer
parent 54b2bddd22
commit c63f9fb37a
5 changed files with 22 additions and 24 deletions
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3
libavcodec/h264_cabac.c
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@@ -2004,7 +2004,8 @@ decode_intra_mb:
// The pixels are stored in the same order as levels in h->mb array.
if ((int) (h->cabac.bytestream_end - ptr) < mb_size)
return -1;
memcpy(h->mb, ptr, mb_size); ptr+=mb_size;
h->intra_pcm_ptr = ptr;
ptr += mb_size;
ff_init_cabac_decoder(&h->cabac, ptr, h->cabac.bytestream_end - ptr);