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 | 14 ++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/libswscale/swscale.h b/libswscale/swscale.h
index ba944cdc6f..f544387769 100644
--- a/libswscale/swscale.h
+++ b/libswscale/swscale.h
@@ -140,6 +140,12 @@ 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 5339bbe099..5dff3c5476 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -2785,3 +2785,17 @@ int sws_test_frame(const AVFrame *frame, int output)
return 1;
}
+
+int sws_is_noop(const AVFrame *dst, const AVFrame *src)
+{
+ for (int field = 0; field < 2; field++) {
+ SwsFormat dst_fmt = ff_fmt_from_frame(dst, field);
+ SwsFormat src_fmt = ff_fmt_from_frame(src, field);
+ if (!ff_fmt_equal(&dst_fmt, &src_fmt))
+ return 0;
+ if (!dst_fmt.interlaced)
+ break;
+ }
+
+ return 1;
+}
--
2.46.1
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