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cbs_h2645: Avoid memcpy when splitting fragment #2 

Now memcpy can be avoided for NAL units containing escapes, too.

Particularly improves performance for files with hardcoded black bars.
For such a file, time spent in cbs_h2645_split_fragment went down from
369410 decicycles to 327677 decicycles. (It were 379114 decicycles when
every NAL unit was copied.)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@googlemail.com>
This commit is contained in:
Andreas Rheinhardt 2018-11-28 01:24:10 +01:00 committed by Mark Thompson
parent 992532ee31
commit 8ca55a2b9e
1 changed files with 11 additions and 22 deletions
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33
libavcodec/cbs_h2645.c
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@ -531,6 +531,7 @@ static int cbs_h2645_fragment_add_nals(CodedBitstreamContext *ctx,
for (i = 0; i < packet->nb_nals; i++) {
const H2645NAL *nal = &packet->nals[i];
AVBufferRef *ref;
size_t size = nal->size;
// Remove trailing zeroes.
@ -538,25 +539,13 @@ static int cbs_h2645_fragment_add_nals(CodedBitstreamContext *ctx,
--size;
av_assert0(size > 0);
if (nal->data == nal->raw_data) {
err = ff_cbs_insert_unit_data(ctx, frag, -1, nal->type,
(uint8_t*)nal->data, size, frag->data_ref);
if (err < 0)
return err;
} else {
uint8_t *data = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!data)
return AVERROR(ENOMEM);
memcpy(data, nal->data, size);
memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
ref = (nal->data == nal->raw_data) ? frag->data_ref
: packet->rbsp.rbsp_buffer_ref;
err = ff_cbs_insert_unit_data(ctx, frag, -1, nal->type,
data, size, NULL);
if (err < 0) {
av_freep(&data);
return err;
}
}
err = ff_cbs_insert_unit_data(ctx, frag, -1, nal->type,
(uint8_t*)nal->data, size, ref);
if (err < 0)
return err;
}
return 0;
@ -612,7 +601,7 @@ static int cbs_h2645_split_fragment(CodedBitstreamContext *ctx,
err = ff_h2645_packet_split(&priv->read_packet,
frag->data + start, end - start,
ctx->log_ctx, 1, 2, AV_CODEC_ID_H264, 1, 0);
ctx->log_ctx, 1, 2, AV_CODEC_ID_H264, 1, 1);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to split AVCC SPS array.\n");
return err;
@ -636,7 +625,7 @@ static int cbs_h2645_split_fragment(CodedBitstreamContext *ctx,
err = ff_h2645_packet_split(&priv->read_packet,
frag->data + start, end - start,
ctx->log_ctx, 1, 2, AV_CODEC_ID_H264, 1, 0);
ctx->log_ctx, 1, 2, AV_CODEC_ID_H264, 1, 1);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to split AVCC PPS array.\n");
return err;
@ -690,7 +679,7 @@ static int cbs_h2645_split_fragment(CodedBitstreamContext *ctx,
err = ff_h2645_packet_split(&priv->read_packet,
frag->data + start, end - start,
ctx->log_ctx, 1, 2, AV_CODEC_ID_HEVC, 1, 0);
ctx->log_ctx, 1, 2, AV_CODEC_ID_HEVC, 1, 1);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to split "
"HVCC array %d (%d NAL units of type %d).\n",
@ -709,7 +698,7 @@ static int cbs_h2645_split_fragment(CodedBitstreamContext *ctx,
frag->data, frag->data_size,
ctx->log_ctx,
priv->mp4, priv->nal_length_size,
codec_id, 1, 0);
codec_id, 1, 1);
if (err < 0)
return err;