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avcodec/ac3enc: Avoid needlessly copying encoded packets around

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AC-3 and EAC-3 are codecs whose packet sizes are known in advance,
so one can use the min_size parameter of ff_alloc_packet2() to
allocate exactly this amount. This avoids a memcpy later in
av_packet_make_refcounted() in encode_simple_internal().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-03-29 18:54:46 +02:00
parent 968c158abd
commit 5d4234b3ea
1 changed files with 2 additions and 1 deletions
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libavcodec/ac3enc.c
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@ -1759,7 +1759,8 @@ int ff_ac3_encode_frame_common_end(AVCodecContext *avctx, AVPacket *avpkt,
ac3_quantize_mantissas(s);
if ((ret = ff_alloc_packet2(avctx, avpkt, s->frame_size, 0)) < 0)
ret = ff_alloc_packet2(avctx, avpkt, s->frame_size, s->frame_size);
if (ret < 0)
return ret;
ac3_output_frame(s, avpkt->data);