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libavcodec/cbs: Stop needlessly reallocating the units array

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Currently, a fragment's unit array is constantly reallocated during
splitting of a packet. This commit changes this: One can keep the units
array by distinguishing between the number of allocated and the number
of valid units in the units array.

The more units a packet is split into, the bigger the benefit.
So MPEG-2 benefits the most; for a video coming from an NTSC-DVD
(usually 32 units per frame) the average cost of cbs_insert_unit (for a
single unit) went down from 6717 decicycles to 450 decicycles (based
upon 10 runs with 4194304 runs each); if each packet consists of only
one unit, it went down from 2425 to 448; for a H.264 video where most
packets contain nine units, it went from 4431 to 450.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@googlemail.com>
This commit is contained in:
Andreas Rheinhardt 2019-02-11 23:47:43 +01:00 • committed by Mark Thompson
parent c5b452ed2f
commit b8c45bbcbc
15 changed files with 113 additions and 59 deletions
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3
libavcodec/vaapi_encode_mjpeg.c
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@ -142,7 +142,7 @@ static int vaapi_encode_mjpeg_write_image_header(AVCodecContext *avctx,
err = 0;
fail:
ff_cbs_fragment_uninit(priv->cbc, frag);
ff_cbs_fragment_reset(priv->cbc, frag);
return err;
}
@ -515,6 +515,7 @@ static av_cold int vaapi_encode_mjpeg_close(AVCodecContext *avctx)
{
VAAPIEncodeMJPEGContext *priv = avctx->priv_data;
ff_cbs_fragment_free(priv->cbc, &priv->current_fragment);
ff_cbs_close(&priv->cbc);
return ff_vaapi_encode_close(avctx);