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tests/swscale: exclude init time from benchmark

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This was originally intended to also include performance gains/losses
due to complicated setup logic, but in practice it just means that changing
the number of iterations dramatically affects the measured speedup; which
makes it harder to do quick bench runs during development.
This commit is contained in:
Niklas Haas
2026-02-18 15:07:47 +01:00
committed by Ramiro Polla
parent a9984fec81
commit 271bacffec
1 changed files with 10 additions and 4 deletions
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14
libswscale/tests/swscale.c
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@@ -193,7 +193,7 @@ static float get_loss(const float ssim[4])
}
static int scale_legacy(AVFrame *dst, const AVFrame *src, struct mode mode,
struct options opts)
struct options opts, int64_t *out_time)
{
SwsContext *sws_legacy;
int ret;
@@ -215,8 +215,10 @@ static int scale_legacy(AVFrame *dst, const AVFrame *src, struct mode mode,
if ((ret = sws_init_context(sws_legacy, NULL, NULL)) < 0)
goto error;
int64_t time = av_gettime_relative();
for (int i = 0; ret >= 0 && i < opts.iters; i++)
ret = sws_scale_frame(sws_legacy, dst, src);
*out_time = av_gettime_relative() - time;
error:
sws_freeContext(sws_legacy);
@@ -273,6 +275,12 @@ static int run_test(enum AVPixelFormat src_fmt, enum AVPixelFormat dst_fmt,
sws[1]->dither = mode.dither;
sws[1]->threads = opts.threads;
if (sws_frame_setup(sws[1], dst, src) < 0) {
av_log(NULL, AV_LOG_ERROR, "Failed to setup %s ---> %s\n",
av_get_pix_fmt_name(src->format), av_get_pix_fmt_name(dst->format));
goto error;
}
time = av_gettime_relative();
for (int i = 0; i < opts.iters; i++) {
@@ -316,13 +324,11 @@ static int run_test(enum AVPixelFormat src_fmt, enum AVPixelFormat dst_fmt,
if (!ssim_ref && sws_isSupportedInput(src->format) && sws_isSupportedOutput(dst->format)) {
/* Compare against the legacy swscale API as a reference */
time_ref = av_gettime_relative();
if (scale_legacy(dst, src, mode, opts) < 0) {
if (scale_legacy(dst, src, mode, opts, &time_ref) < 0) {
av_log(NULL, AV_LOG_ERROR, "Failed ref %s ---> %s\n",
av_get_pix_fmt_name(src->format), av_get_pix_fmt_name(dst->format));
goto error;
}
time_ref = av_gettime_relative() - time_ref;
if (sws_scale_frame(sws[2], out, dst) < 0)
goto error;