On Thu, 4 Mar 2021, Michael Niedermayer wrote:
This avoids crafted files from consuming excessive resources recomputing the
clut after each pixel change
Signed-off-by: Michael Niedermayer <[email protected]>
---
libavcodec/dvbsubdec.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
PLease update doc/decoders.texi as well.
Thanks,
Marton
diff --git a/libavcodec/dvbsubdec.c b/libavcodec/dvbsubdec.c
index 9bee33e4a2..6f340460d8 100644
--- a/libavcodec/dvbsubdec.c
+++ b/libavcodec/dvbsubdec.c
@@ -979,7 +979,8 @@ static void dvbsub_parse_pixel_data_block(AVCodecContext
*avctx, DVBSubObjectDis
}
}
- region->has_computed_clut = 0;
+ if (ctx->compute_clut != -2)
+ region->has_computed_clut = 0;
}
static int dvbsub_parse_object_segment(AVCodecContext *avctx,
@@ -1737,7 +1738,7 @@ end:
#define OFFSET(x) offsetof(DVBSubContext, x)
static const AVOption options[] = {
{"compute_edt", "compute end of time using pts or timeout",
OFFSET(compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
- {"compute_clut", "compute clut when not available(-1) or always(1) or
never(0)", OFFSET(compute_clut), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, DS},
+ {"compute_clut", "compute clut when not available(-1) or only once (-2) or
always(1) or never(0)", OFFSET(compute_clut), AV_OPT_TYPE_BOOL, {.i64 = -1}, -2, 1, DS},
{"dvb_substream", "", OFFSET(substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1,
63, DS},
{NULL}
};
--
2.17.1
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