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avutil/csp: add av_csp_trc_inv_from_id()

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Mathematical inverse of av_csp_trc_from_id(), plus testing to make sure it
roundtrips correctly with the corresponding TRC.
This commit is contained in:
Niklas Haas 2024-11-25 13:35:34 +01:00
parent 28f217780b
commit bf0a6c4111
6 changed files with 471 additions and 319 deletions
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13
libavutil/tests/color_utils.c
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@ -18,7 +18,9 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <math.h>
#include <stdio.h>
#include "libavutil/csp.h"
#include "libavutil/macros.h"
#include "libavutil/pixdesc.h"
@ -34,14 +36,21 @@ int main(int argc, char *argv[])
for (enum AVColorTransferCharacteristic trc = 0; trc < AVCOL_TRC_NB; trc++) {
av_csp_trc_function func = av_csp_trc_func_from_id(trc);
av_csp_trc_function func_inv = av_csp_trc_func_inv_from_id(trc);
const char *name = av_color_transfer_name(trc);
if (!func)
continue;
for (int i = 0; i < FF_ARRAY_ELEMS(test_data); i++) {
double result = func(test_data[i]);
printf("trc=%s calling func(%f) expected=%f\n",
name, test_data[i], result);
double roundtrip = func_inv(result);
printf("trc=%s calling func(%f) expected=%f roundtrip=%f\n",
name, test_data[i], result, roundtrip);
if (result > 0.0 && fabs(roundtrip - test_data[i]) > 1e-8) {
printf(" FAIL\n");
return 1;
}
}
}
}