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avcodec/cbs: use a reference to the assembled CodedBitstreamFragment buffer when writing packets

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This saves one malloc + memcpy per packet

The CodedBitstreamFragment buffer is padded to follow the requirements
of AVPacket.

Reviewed-by: jkqxz
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2018-03-05 11:04:59 -03:00
parent 69995a94d8
commit df3a2ff767
3 changed files with 15 additions and 8 deletions
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12
libavcodec/cbs.c
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@@ -308,17 +308,21 @@ int ff_cbs_write_packet(CodedBitstreamContext *ctx,
AVPacket *pkt,
CodedBitstreamFragment *frag)
{
AVBufferRef *buf;
int err;
err = ff_cbs_write_fragment_data(ctx, frag);
if (err < 0)
return err;
err = av_new_packet(pkt, frag->data_size);
if (err < 0)
return err;
av_assert0(frag->data_ref);
buf = av_buffer_ref(frag->data_ref);
if (!buf)
return AVERROR(ENOMEM);
memcpy(pkt->data, frag->data, frag->data_size);
av_init_packet(pkt);
pkt->buf = buf;
pkt->data = frag->data;
pkt->size = frag->data_size;
return 0;