On Wed, 4 Jun 2025 at 12:24, Niklas Haas <ffm...@haasn.xyz> wrote:
>
> From: Niklas Haas <g...@haasn.dev>
>
> Give users and developers a way to opt in to the new format conversion code,
> and more code from the swscale rewrite in general, even while development is
> still ongoing.
> ---
> doc/APIchanges | 3 +++
> doc/scaler.texi | 4 ++++
> libswscale/options.c | 1 +
> libswscale/swscale.h | 7 +++++++
> libswscale/version.h | 2 +-
> 5 files changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/doc/APIchanges b/doc/APIchanges
> index 91710bb27d..ae5e4b366b 100644
> --- a/doc/APIchanges
> +++ b/doc/APIchanges
> @@ -2,6 +2,9 @@ The last version increases of all libraries were on 2025-03-28
>
> API changes, most recent first:
>
> +2025-04-xx - xxxxxxxxxx - lsws 9.1.100 - swscale.h
> + Add SWS_UNSTABLE flag.
> +
> 2025-05-21 - xxxxxxxxxx - lavu 60.3.100 - avassert.h
> Add av_unreachable() and av_assume() macros.
>
> diff --git a/doc/scaler.texi b/doc/scaler.texi
> index eb045de6b7..42b2377761 100644
> --- a/doc/scaler.texi
> +++ b/doc/scaler.texi
> @@ -68,6 +68,10 @@ Select full chroma input.
>
> @item bitexact
> Enable bitexact output.
> +
> +@item unstable
> +Allow the use of experimental new code. May subtly affect the output or even
> +produce wrong results. For testing only.
> @end table
>
> @item srcw @var{(API only)}
> diff --git a/libswscale/options.c b/libswscale/options.c
> index feecae8c89..06e51dcfe9 100644
> --- a/libswscale/options.c
> +++ b/libswscale/options.c
> @@ -50,6 +50,7 @@ static const AVOption swscale_options[] = {
> { "full_chroma_inp", "full chroma input", 0,
> AV_OPT_TYPE_CONST, { .i64 = SWS_FULL_CHR_H_INP }, .flags = VE, .unit =
> "sws_flags" },
> { "bitexact", "bit-exact mode", 0,
> AV_OPT_TYPE_CONST, { .i64 = SWS_BITEXACT }, .flags = VE, .unit =
> "sws_flags" },
> { "error_diffusion", "error diffusion dither", 0,
> AV_OPT_TYPE_CONST, { .i64 = SWS_ERROR_DIFFUSION}, .flags = VE, .unit =
> "sws_flags" },
> + { "unstable", "allow experimental new code", 0,
> AV_OPT_TYPE_CONST, { .i64 = SWS_UNSTABLE }, .flags = VE, .unit =
> "sws_flags" },
>
> { "param0", "scaler param 0", OFFSET(scaler_params[0]),
> AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, VE },
> { "param1", "scaler param 1", OFFSET(scaler_params[1]),
> AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, VE },
> diff --git a/libswscale/swscale.h b/libswscale/swscale.h
> index b04aa182d2..4aa072009c 100644
> --- a/libswscale/swscale.h
> +++ b/libswscale/swscale.h
> @@ -155,6 +155,13 @@ typedef enum SwsFlags {
> SWS_ACCURATE_RND = 1 << 18,
> SWS_BITEXACT = 1 << 19,
>
> + /**
> + * Allow using experimental new code paths. This may be faster, slower,
> + * or produce different output, with semantics subject to change at any
> + * point in time. For testing and debugging purposes only.
> + */
> + SWS_UNSTABLE = 1 << 20,
Add this flag also in the list in target_sws_fuzzer.c, so it will be
tested after merge.
- Kacper
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