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avcodec/qtrle: call ff_reget_buffer() only when the picture data is going to change

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ff_reget_buffer() will attempt to create a writable copy of the frame,
which is not needed when the decoder intends to return a reference to
the same buffer as the previous frame.

Should reduce data copy, hopefully achieving a similar speed up as
a9dacdeea6 without dropping frames.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2019-08-26 14:29:59 -03:00
parent 8b71cc3363
commit d70bbdc5fa
1 changed files with 23 additions and 5 deletions
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28
libavcodec/qtrle.c
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@ -452,15 +452,16 @@ static int qtrle_decode_frame(AVCodecContext *avctx,
int header, start_line;
int height, row_ptr;
int has_palette = 0;
int duplicate = 0;
int ret, size;
bytestream2_init(&s->g, avpkt->data, avpkt->size);
if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
return ret;
/* check if this frame is even supposed to change */
if (avpkt->size < 8)
if (avpkt->size < 8) {
duplicate = 1;
goto done;
}
/* start after the chunk size */
size = bytestream2_get_be32(&s->g) & 0x3FFFFFFF;
@ -473,18 +474,25 @@ static int qtrle_decode_frame(AVCodecContext *avctx,
/* if a header is present, fetch additional decoding parameters */
if (header & 0x0008) {
if (avpkt->size < 14)
if (avpkt->size < 14) {
duplicate = 1;
goto done;
}
start_line = bytestream2_get_be16(&s->g);
bytestream2_skip(&s->g, 2);
height = bytestream2_get_be16(&s->g);
bytestream2_skip(&s->g, 2);
if (height > s->avctx->height - start_line)
if (height > s->avctx->height - start_line) {
duplicate = 1;
goto done;
}
} else {
start_line = 0;
height = s->avctx->height;
}
if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
return ret;
row_ptr = s->frame->linesize[0] * start_line;
switch (avctx->bits_per_coded_sample) {
@ -546,6 +554,16 @@ static int qtrle_decode_frame(AVCodecContext *avctx,
}
done:
if (!s->frame->data[0])
return AVERROR_INVALIDDATA;
if (duplicate) {
// ff_reget_buffer() isn't needed when frames don't change, so just update
// frame props.
ret = ff_decode_frame_props(avctx, s->frame);
if (ret < 0)
return ret;
}
if ((ret = av_frame_ref(data, s->frame)) < 0)
return ret;
*got_frame = 1;