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swscale: add sws_is_noop()

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Exactly what it says on the tin.

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>
This commit is contained in:
Niklas Haas 2024-10-14 15:16:26 +02:00
parent 5e50a56b9c
commit b03c758600
4 changed files with 24 additions and 1 deletions
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3
doc/APIchanges
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@ -2,6 +2,9 @@ The last version increases of all libraries were on 2024-03-07
API changes, most recent first:
2024-10-23 - xxxxxxxxxx - lsws 8.9.100 - swscale.h
Add sws_is_noop().
2024-10-23 - xxxxxxxxxx - lsws 8.8.100 - swscale.h
Add frame property testing API:
- sws_test_format()

6
libswscale/swscale.h
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@ -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

14
libswscale/utils.c
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@ -2777,3 +2777,17 @@ 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
libswscale/version.h
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@ -28,7 +28,7 @@
#include "version_major.h"
#define LIBSWSCALE_VERSION_MINOR 8
#define LIBSWSCALE_VERSION_MINOR 9
#define LIBSWSCALE_VERSION_MICRO 100
#define LIBSWSCALE_VERSION_INT AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \