From: Niklas Haas <g...@haasn.dev>
Exactly what it says on the tin.
Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <g...@haasn.dev>
---
libswscale/swscale.h | 6 ++++++
libswscale/utils.c | 7 +++++++
2 files changed, 13 insertions(+)
diff --git a/libswscale/swscale.h b/libswscale/swscale.h
index f36efa4183..d7ea9bd714 100644
--- a/libswscale/swscale.h
+++ b/libswscale/swscale.h
@@ -139,6 +139,12 @@ int sws_test_transfer(enum AVColorTransferCharacteristic
trc, int output);
*/
int sws_test_frame(const AVFrame *frame, int output);
+/**
+ * Check if a given conversion is a noop. Returns a positive integer if
+ * no operation needs to be performed, 0 otherwise.
+ */
+int sws_is_noop(const AVFrame *dst, const AVFrame *src);
+
/* values for the flags, the stuff on the command line is different */
#define SWS_FAST_BILINEAR 1
#define SWS_BILINEAR 2
diff --git a/libswscale/utils.c b/libswscale/utils.c
index 22411d3429..01fe474020 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -2758,3 +2758,10 @@ int sws_test_frame(const AVFrame *frame, int output)
const SwsFormat fmt = ff_fmt_from_frame(frame);
return ff_test_fmt(&fmt, output);
}
+
+int sws_is_noop(const AVFrame *dst, const AVFrame *src)
+{
+ SwsFormat dst_fmt = ff_fmt_from_frame(dst);
+ SwsFormat src_fmt = ff_fmt_from_frame(src);
+ return ff_fmt_equal(&dst_fmt, &src_fmt);
+}
--
2.46.1
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