options: remove global variables for swscale options; rename them

Additionally to removing the global variables, this makes the options
more uniform. --ssf-... becomes --sws-..., and --sws becomes --sws-
scaler. For --sws-scaler, use choices instead of magic integer values.

11 files changed, 77 insertions, 83 deletions

diff --git a/DOCS/man/en/changes.rst b/DOCS/man/en/changes.rst
index 1387d03372..01a210fae8 100644
--- a/DOCS/man/en/changes.rst
+++ b/DOCS/man/en/changes.rst
@@ -189,6 +189,7 @@ Command Line Switches
     ``-spugauss``               ``--sub-gauss``
     ``-srate``                  ``--audio-samplerate``
     ``-ss``                     ``--start``
+    ``-ssf <sub>``              ``--sws-...``
     ``-stop-xscreensaver``      ``--stop-screensaver``
     ``-sub-fuzziness``          ``--sub-auto``
     ``-sub``                    ``--sub-file``
@@ -200,6 +201,7 @@ Command Line Switches
     ``-subfont``                ``--sub-text-font``
     ``-subfps``                 ``--sub-fps``
     ``-subpos``                 ``--sub-pos``
+    ``-sws``                    ``--sws-scaler``
     ``-tvscan``                 ``--tv-scan``
     ``-use-filename-title``     ``--title='${filename}'``
     ``-vc ffh264vdpau`` (etc.)  ``--hwdec=vdpau``
diff --git a/DOCS/man/en/options.rst b/DOCS/man/en/options.rst
index 44219a35e9..d2ae257d91 100644
--- a/DOCS/man/en/options.rst
+++ b/DOCS/man/en/options.rst
@@ -2120,20 +2120,6 @@ OPTIONS
 
     Disabled by default.
 
-``--ssf=<mode>``
-    Specifies software scaler parameters.
-
-    :lgb=<0-100>:   gaussian blur filter (luma)
-    :cgb=<0-100>:   gaussian blur filter (chroma)
-    :ls=<-100-100>: sharpen filter (luma)
-    :cs=<-100-100>: sharpen filter (chroma)
-    :chs=<h>:       chroma horizontal shifting
-    :cvs=<v>:       chroma vertical shifting
-
-    .. admonition:: Example
-
-        ``--vf=scale --ssf=lgb=3.0``
-
 ``--sstep=<sec>``
     Skip <sec> seconds after every frame.
 
@@ -2309,29 +2295,32 @@ OPTIONS
         `--sub-speed=25/23.976`` plays frame based subtitles which have been
         loaded assuming a framerate of 23.976 at 25 FPS.
 
-``--sws=<n>``
+``--sws-scaler=<name>``
     Specify the software scaler algorithm to be used with ``--vf=scale``. This
     also affects video output drivers which lack hardware acceleration,
     e.g. ``x11``. See also ``--vf=scale``.
 
-    Available types are:
+    To get a list of available scalers, run ``--sws-scaler=help``.
 
-    :0:  fast bilinear
-    :1:  bilinear
-    :2:  bicubic (good quality) (default)
-    :3:  experimental
-    :4:  nearest neighbor (bad quality)
-    :5:  area
-    :6:  luma bicubic / chroma bilinear
-    :7:  gauss
-    :8:  sincR
-    :9:  lanczos
-    :10: natural bicubic spline
+    Default: ``bicubic``.
 
-    .. note::
+``--sws-lgb=<0-100>``
+    Software scaler gaussian blur filter (luma). See ``--sws-scaler``.
+
+``--sws-cgb=<0-100>``
+    Software scaler gaussian blur filter (chroma). See ``--sws-scaler``.
+
+``--sws-ls=<-100-100>``
+    Software scaler sharpen filter (luma). See ``--sws-scaler``.
+
+``--sws-cs=<-100-100>``
+    Software scaler sharpen filter (chroma). See ``--sws-scaler``.
+
+``--sws-chs=<h>``
+    Software scaler chroma horizontal shifting. See ``--sws-scaler``.
 
-        Some ``--sws`` options are tunable. The description of the ``scale``
-        video filter has further information.
+``--sws-cvs=<v>``
+    Software scaler chroma vertical shifting. See ``--sws-scaler``.
 
 ``--term-osd, --no-term-osd``, ``--term-osd=force``
     Display OSD messages on the console when no video output is available.
diff --git a/options/options.c b/options/options.c
index 09820aa6bf..ef88cab829 100644
--- a/options/options.c
+++ b/options/options.c
@@ -47,8 +47,6 @@
 extern const m_option_t demux_rawaudio_opts[];
 extern const m_option_t demux_rawvideo_opts[];
 
-extern int sws_flags;
-
 extern const char mp_help_text[];
 
 static void print_version(struct mp_log *log)
@@ -65,26 +63,10 @@ extern const struct m_sub_options tv_params_conf;
 extern const struct m_sub_options stream_pvr_conf;
 extern const struct m_sub_options stream_cdda_conf;
 extern const struct m_sub_options stream_dvb_conf;
+extern const struct m_sub_options sws_conf;
 
 extern const m_option_t lavfdopts_conf[];
 
-extern int sws_chr_vshift;
-extern int sws_chr_hshift;
-extern float sws_chr_gblur;
-extern float sws_lum_gblur;
-extern float sws_chr_sharpen;
-extern float sws_lum_sharpen;
-
-static const m_option_t scaler_filter_conf[]={
-    {"lgb", &sws_lum_gblur, CONF_TYPE_FLOAT, 0, 0, 100.0, NULL},
-    {"cgb", &sws_chr_gblur, CONF_TYPE_FLOAT, 0, 0, 100.0, NULL},
-    {"cvs", &sws_chr_vshift, CONF_TYPE_INT, 0, 0, 0, NULL},
-    {"chs", &sws_chr_hshift, CONF_TYPE_INT, 0, 0, 0, NULL},
-    {"ls", &sws_lum_sharpen, CONF_TYPE_FLOAT, 0, -100.0, 100.0, NULL},
-    {"cs", &sws_chr_sharpen, CONF_TYPE_FLOAT, 0, -100.0, 100.0, NULL},
-    {NULL, NULL, 0, 0, 0, 0, NULL}
-};
-
 extern double mf_fps;
 extern char * mf_type;
 extern const struct m_obj_list vf_obj_list;
@@ -294,9 +276,8 @@ const m_option_t mp_opts[] = {
                 {"vaapi-copy", 5})),
     OPT_STRING("hwdec-codecs", hwdec_codecs, 0),
 
-    // scaling:
-    {"sws", &sws_flags, CONF_TYPE_INT, 0, 0, 2, NULL},
-    {"ssf", (void *) scaler_filter_conf, CONF_TYPE_SUBCONFIG, 0, 0, 0, NULL},
+    OPT_SUBSTRUCT("sws", vo.sws_opts, sws_conf, 0),
+
     // -1 means auto aspect (prefer container size until aspect change)
     //  0 means square pixels
     OPT_FLOATRANGE("video-aspect", movie_aspect, 0, -1.0, 10.0),
diff --git a/options/options.h b/options/options.h
index 7e8c22451d..cc57795446 100644
--- a/options/options.h
+++ b/options/options.h
@@ -38,6 +38,8 @@ typedef struct mp_vo_opts {
     int force_window_position;
 
     int fs_missioncontrol;
+
+    struct sws_opts *sws_opts;
 } mp_vo_opts;
 
 struct mp_cache_opts {
diff --git a/video/filter/vf.c b/video/filter/vf.c
index 32a376af3f..5326483444 100644
--- a/video/filter/vf.c
+++ b/video/filter/vf.c
@@ -275,6 +275,7 @@ static struct vf_instance *vf_open(struct vf_chain *c, const char *name,
         .hwdec = c->hwdec,
         .query_format = vf_default_query_format,
         .out_pool = talloc_steal(vf, mp_image_pool_new(16)),
+        .chain = c,
     };
     struct m_config *config = m_config_from_obj_desc(vf, vf->log, &desc);
     if (m_config_apply_defaults(config, name, c->opts->vf_defs) < 0)
diff --git a/video/filter/vf.h b/video/filter/vf.h
index 0e3a02b3a2..bfe573e618 100644
--- a/video/filter/vf.h
+++ b/video/filter/vf.h
@@ -93,6 +93,7 @@ typedef struct vf_instance {
     // Caches valid output formats.
     uint8_t last_outfmts[IMGFMT_END - IMGFMT_START];
 
+    struct vf_chain *chain;
     struct vf_instance *next;
 } vf_instance_t;
 
diff --git a/video/filter/vf_scale.c b/video/filter/vf_scale.c
index bcb4cae2f2..730994c12c 100644
--- a/video/filter/vf_scale.c
+++ b/video/filter/vf_scale.c
@@ -317,7 +317,7 @@ static int reconfig(struct vf_instance *vf, struct mp_image_params *in,
     }
     mp_image_params_guess_csp(out);
 
-    mp_sws_set_from_cmdline(vf->priv->sws);
+    mp_sws_set_from_cmdline(vf->priv->sws, vf->chain->opts->vo.sws_opts);
     vf->priv->sws->flags |= vf->priv->v_chr_drop << SWS_SRC_V_CHR_DROP_SHIFT;
     vf->priv->sws->flags |= vf->priv->accurate_rnd * SWS_ACCURATE_RND;
     vf->priv->sws->src = *in;
diff --git a/video/out/vo_wayland.c b/video/out/vo_wayland.c
index 54376d7e6d..7776bf4d4d 100644
--- a/video/out/vo_wayland.c
+++ b/video/out/vo_wayland.c
@@ -510,7 +510,7 @@ static bool resize(struct priv *p)
     if (y != 0)
         y = wl->window.height - p->dst_h;
 
-    mp_sws_set_from_cmdline(p->sws);
+    mp_sws_set_from_cmdline(p->sws, p->vo->opts->sws_opts);
     p->sws->src = p->in_format;
     p->sws->dst = (struct mp_image_params) {
         .imgfmt = p->video_format->mp_fmt,
diff --git a/video/out/vo_x11.c b/video/out/vo_x11.c
index a8b37d4016..26af641dbb 100644
--- a/video/out/vo_x11.c
+++ b/video/out/vo_x11.c
@@ -370,7 +370,7 @@ static bool resize(struct vo *vo)
     }
     p->bpp = p->myximage[0]->bits_per_pixel;
 
-    mp_sws_set_from_cmdline(p->sws);
+    mp_sws_set_from_cmdline(p->sws, vo->opts->sws_opts);
     p->sws->src = p->in_format;
     p->sws->dst = (struct mp_image_params) {
         .imgfmt = fmte->mpfmt,
diff --git a/video/sws_utils.c b/video/sws_utils.c
index d8fd492473..cd69802342 100644
--- a/video/sws_utils.c
+++ b/video/sws_utils.c
@@ -27,6 +27,7 @@
 #include "sws_utils.h"
 
 #include "common/common.h"
+#include "options/m_option.h"
 #include "video/mp_image.h"
 #include "video/img_format.h"
 #include "fmt-conversion.h"
@@ -35,14 +36,44 @@
 #include "video/filter/vf.h"
 
 //global sws_flags from the command line
-int sws_flags = 2;
-
-float sws_lum_gblur = 0.0;
-float sws_chr_gblur = 0.0;
-int sws_chr_vshift = 0;
-int sws_chr_hshift = 0;
-float sws_chr_sharpen = 0.0;
-float sws_lum_sharpen = 0.0;
+struct sws_opts {
+    int scaler;
+    float lum_gblur;
+    float chr_gblur;
+    int chr_vshift;
+    int chr_hshift;
+    float chr_sharpen;
+    float lum_sharpen;
+};
+
+#define OPT_BASE_STRUCT struct sws_opts
+const struct m_sub_options sws_conf = {
+    .opts = (const m_option_t[]) {
+        OPT_CHOICE("scaler", scaler, 0,
+                   ({"fast-bilinear",   SWS_FAST_BILINEAR},
+                    {"bilinear",        SWS_BILINEAR},
+                    {"bicubic",         SWS_BICUBIC},
+                    {"x",               SWS_X},
+                    {"point",           SWS_POINT},
+                    {"area",            SWS_AREA},
+                    {"bicublin",        SWS_BICUBLIN},
+                    {"gauss",           SWS_GAUSS},
+                    {"sinc",            SWS_SINC},
+                    {"lanczos",         SWS_LANCZOS},
+                    {"spline",          SWS_SPLINE})),
+        OPT_FLOATRANGE("lgb", lum_gblur, 0, 0, 100.0),
+        OPT_FLOATRANGE("cgb", chr_gblur, 0, 0, 100.0),
+        OPT_INT("cvs", chr_vshift, 0),
+        OPT_INT("chs", chr_hshift, 0),
+        OPT_FLOATRANGE("ls", lum_sharpen, 0, -100.0, 100.0),
+        OPT_FLOATRANGE("cs", chr_sharpen, 0, -100.0, 100.0),
+        {0}
+    },
+    .size = sizeof(struct sws_opts),
+    .defaults = &(const struct sws_opts){
+        .scaler = SWS_BICUBIC,
+    },
+};
 
 // Highest quality, but also slowest.
 const int mp_sws_hq_flags = SWS_LANCZOS | SWS_FULL_CHR_H_INT |
@@ -53,30 +84,16 @@ const int mp_sws_hq_flags = SWS_LANCZOS | SWS_FULL_CHR_H_INT |
 const int mp_sws_fast_flags = SWS_BILINEAR;
 
 // Set ctx parameters to global command line flags.
-void mp_sws_set_from_cmdline(struct mp_sws_context *ctx)
+void mp_sws_set_from_cmdline(struct mp_sws_context *ctx, struct sws_opts *opts)
 {
     sws_freeFilter(ctx->src_filter);
-    ctx->src_filter = sws_getDefaultFilter(sws_lum_gblur, sws_chr_gblur,
-                                           sws_lum_sharpen, sws_chr_sharpen,
-                                           sws_chr_hshift, sws_chr_vshift, 0);
+    ctx->src_filter = sws_getDefaultFilter(opts->lum_gblur, opts->chr_gblur,
+                                           opts->lum_sharpen, opts->chr_sharpen,
+                                           opts->chr_hshift, opts->chr_vshift, 0);
     ctx->force_reload = true;
 
     ctx->flags = SWS_PRINT_INFO;
-
-    switch (sws_flags) {
-    case 0:  ctx->flags |= SWS_FAST_BILINEAR;   break;
-    case 1:  ctx->flags |= SWS_BILINEAR;        break;
-    case 2:  ctx->flags |= SWS_BICUBIC;         break;
-    case 3:  ctx->flags |= SWS_X;               break;
-    case 4:  ctx->flags |= SWS_POINT;           break;
-    case 5:  ctx->flags |= SWS_AREA;            break;
-    case 6:  ctx->flags |= SWS_BICUBLIN;        break;
-    case 7:  ctx->flags |= SWS_GAUSS;           break;
-    case 8:  ctx->flags |= SWS_SINC;            break;
-    case 9:  ctx->flags |= SWS_LANCZOS;         break;
-    case 10: ctx->flags |= SWS_SPLINE;          break;
-    default: ctx->flags |= SWS_BILINEAR;        break;
-    }
+    ctx->flags |= opts->scaler;
 }
 
 bool mp_sws_supported_format(int imgfmt)
diff --git a/video/sws_utils.h b/video/sws_utils.h
index d20e197197..212e1405b4 100644
--- a/video/sws_utils.h
+++ b/video/sws_utils.h
@@ -7,6 +7,7 @@
 
 struct mp_image;
 struct mp_csp_details;
+struct sws_opts;
 
 // libswscale currently requires 16 bytes alignment for row pointers and
 // strides. Otherwise, it will print warnings and use slow codepaths.
@@ -51,7 +52,7 @@ struct mp_sws_context {
 
 struct mp_sws_context *mp_sws_alloc(void *talloc_ctx);
 int mp_sws_reinit(struct mp_sws_context *ctx);
-void mp_sws_set_from_cmdline(struct mp_sws_context *ctx);
+void mp_sws_set_from_cmdline(struct mp_sws_context *ctx, struct sws_opts *opts);
 int mp_sws_scale(struct mp_sws_context *ctx, struct mp_image *dst,
                  struct mp_image *src);