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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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5
libavcodec/av1_parser.c
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@@ -72,7 +72,7 @@ static int av1_parser_parse(AVCodecParserContext *ctx,
goto end;
}
ff_cbs_fragment_uninit(s->cbc, td);
ff_cbs_fragment_reset(s->cbc, td);
}
ret = ff_cbs_read(s->cbc, td, data, size);
@@ -159,7 +159,7 @@ static int av1_parser_parse(AVCodecParserContext *ctx,
}
end:
ff_cbs_fragment_uninit(s->cbc, td);
ff_cbs_fragment_reset(s->cbc, td);
s->cbc->log_ctx = NULL;
@@ -193,6 +193,7 @@ static void av1_parser_close(AVCodecParserContext *ctx)
{
AV1ParseContext *s = ctx->priv_data;
ff_cbs_fragment_free(s->cbc, &s->temporal_unit);
ff_cbs_close(&s->cbc);
}