Re: [FFmpeg-devel] [PATCH] avfilter: add zoneplate video source filter

[Paul B Mahol <onemda@gmail.com>]

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New version, faster and with slice threading and docs.

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From 8b9ab6e3401d69f115b5d331fec73fd8c01ea1bd Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sat, 6 May 2023 22:52:47 +0200
Subject: [PATCH] avfilter: add zoneplate video test source

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 doc/filters.texi           |  96 +++++++++++++++++++++++
 libavfilter/Makefile       |   1 +
 libavfilter/allfilters.c   |   1 +
 libavfilter/vsrc_testsrc.c | 157 +++++++++++++++++++++++++++++++++++++
 4 files changed, 255 insertions(+)

diff --git a/doc/filters.texi b/doc/filters.texi
index 8b443c24e9..d7c828d119 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -28080,6 +28080,102 @@ Set max jump for single pan destination. Allowed range is from 1 to 10000.
 Set fractal type, can be default @code{carpet} or @code{triangle}.
 @end table
 
+@section zoneplate
+Generates a zoneplate test video pattern.
+Numerous options for signal controls output phase in all three axis.
+
+This source accepts the following options:
+
+@table @option
+@item size, s
+Set frame size. For the syntax of this option, check the @ref{video size syntax,,"Video
+size" section in the ffmpeg-utils manual,ffmpeg-utils}. Default value is "320x240".
+
+@item rate, r
+Set frame rate, expressed as number of frames per second. Default
+value is "25".
+
+@item duration, d
+Set the duration of the sourced video. See
+@ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}
+for the accepted syntax.
+
+If not specified, or the expressed duration is negative, the video is
+supposed to be generated forever.
+
+@item sar
+Set the sample aspect ratio of the sourced video.
+
+@item precision
+Set precision in bits for look-up table for sine calculations. Default value is 10.
+Allowed range is from 4 to 16.
+
+@item xo
+Set horizontal axis offset for output signal. Default value is 0.
+
+@item yo
+Set vertical axis offset for output signal. Default value is 0.
+
+@item k0
+Set 0-order, constant added to signal phase. Default value is 0.
+
+@item kx
+Set 1-order, phase factor multiplier for horizontal axis. Default value is 0.
+
+@item ky
+Set 1-order, phase factor multiplier for vertical axis. Default value is 0.
+
+@item kt
+Set 1-order, phase factor multiplier for time axis. Default value is 0.
+
+@item kxt, kyt, kxy
+Set phase factor multipliers for combination of spatial and temporal axis.
+Default value is 0.
+
+@item kx2
+Set 2-order, phase factor multiplier for horizontal axis. Default value is 0.
+
+@item ky2
+Set 2-order, phase factor multiplier for vertical axis. Default value is 0.
+
+@item kt2
+Set 2-order, phase factor multiplier for time axis. Default value is 0.
+
+@item ku
+Set the constant added to final phase to produce chroma-blue component of signal.
+Default value is 0.
+
+@item kv
+Set the constant added to final phase to produce chroma-red component of signal.
+Default value is 0.
+@end table
+
+@subsection Commands
+
+Filter supports the some above options as @ref{commands}.
+
+@subsection Examples
+
+@itemize
+@item
+Generate horizontal color sine sweep:
+@example
+zoneplate=ku=512:kv=0:kt2=0:kx2=256:s=wvga:xo=-426:kt=11
+@end example
+
+@item
+Generate vertical color sine sweep:
+@example
+zoneplate=ku=512:kv=0:kt2=0:ky2=156:s=wvga:yo=-240:kt=11
+@end example
+
+@item
+Generate circular zone-plate:
+@example
+zoneplate=ku=512:kv=100:kt2=0:ky2=256:kx2=556:s=wvga:yo=0:kt=11
+@end example
+@end itemize
+
 @c man end VIDEO SOURCES
 
 @chapter Video Sinks
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 93c614eeb7..9fb9a1095f 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -598,6 +598,7 @@ OBJS-$(CONFIG_SMPTEHDBARS_FILTER)            += vsrc_testsrc.o
 OBJS-$(CONFIG_TESTSRC_FILTER)                += vsrc_testsrc.o
 OBJS-$(CONFIG_TESTSRC2_FILTER)               += vsrc_testsrc.o
 OBJS-$(CONFIG_YUVTESTSRC_FILTER)             += vsrc_testsrc.o
+OBJS-$(CONFIG_ZONEPLATE_FILTER)              += vsrc_testsrc.o
 
 OBJS-$(CONFIG_NULLSINK_FILTER)               += vsink_nullsink.o
 
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 1c0bc12a92..025966dc45 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -563,6 +563,7 @@ extern const AVFilter ff_vsrc_smptehdbars;
 extern const AVFilter ff_vsrc_testsrc;
 extern const AVFilter ff_vsrc_testsrc2;
 extern const AVFilter ff_vsrc_yuvtestsrc;
+extern const AVFilter ff_vsrc_zoneplate;
 
 extern const AVFilter ff_vsink_nullsink;
 
diff --git a/libavfilter/vsrc_testsrc.c b/libavfilter/vsrc_testsrc.c
index f391ac02e0..1e74a0e42e 100644
--- a/libavfilter/vsrc_testsrc.c
+++ b/libavfilter/vsrc_testsrc.c
@@ -88,6 +88,14 @@ typedef struct TestSourceContext {
 
     /* only used by haldclut */
     int level;
+
+    /* only used by zoneplate */
+    int k0, kx, ky, kt;
+    int kxt, kyt, kxy;
+    int kx2, ky2, kt2;
+    int xo, yo, kU, kV;
+    int lut_precision;
+    uint8_t *lut;
 } TestSourceContext;
 
 #define OFFSET(x) offsetof(TestSourceContext, x)
@@ -135,6 +143,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     TestSourceContext *test = ctx->priv;
 
     av_frame_free(&test->picref);
+    av_freep(&test->lut);
 }
 
 static int config_props(AVFilterLink *outlink)
@@ -2049,3 +2058,151 @@ const AVFilter ff_vsrc_colorchart = {
 };
 
 #endif /* CONFIG_COLORCHART_FILTER */
+
+#if CONFIG_COLORCHART_FILTER
+
+static const AVOption zoneplate_options[] = {
+    COMMON_OPTIONS
+    { "precision", "set LUT precision", OFFSET(lut_precision), AV_OPT_TYPE_INT, {.i64=10}, 4, 16, FLAGS },
+    { "xo", "set x-axis offset", OFFSET(xo), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "yo", "set y-axis offset", OFFSET(yo), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "k0", "set 0-order phase", OFFSET(k0), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "kx", "set 1-order X-axis phase", OFFSET(kx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "ky", "set 1-order Y-axis phase", OFFSET(ky), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "kt", "set 1-order T-axis phase", OFFSET(kt), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "kxt", "set X-axis*T-axis product phase", OFFSET(kxt), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "kyt", "set Y-axis*T-axis product phase", OFFSET(kyt), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "kxy", "set X-axis*Y-axis product phase", OFFSET(kxy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "kx2", "set 2-order X-axis phase", OFFSET(kx2), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "ky2", "set 2-order Y-axis phase", OFFSET(ky2), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "kt2", "set 2-order T-axis phase", OFFSET(kt2), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "ku", "set 0-order U-color phase", OFFSET(kU), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { "kv", "set 0-order V-color phase", OFFSET(kV), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGSR },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(zoneplate);
+
+static int zoneplate_config_props(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->src;
+    TestSourceContext *s = ctx->priv;
+
+    if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
+        return AVERROR(EINVAL);
+    return config_props(inlink);
+}
+
+static void zoneplate_fill_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
+{
+    TestSourceContext *test = ctx->priv;
+    AVFrame *frame = arg;
+    const int w = frame->width;
+    const int h = frame->height;
+    const int kxt = test->kxt, kyt = test->kyt, kx2 = test->kx2;
+    const int t = test->pts, k0 = test->k0;
+    const int kt = test->kt, kt2 = test->kt2, ky2 = test->ky2;
+    const int ky = test->ky, kx = test->kx, kxy = test->kxy;
+    const int lut_mask = (1 << test->lut_precision) - 1;
+    const int nkt2t = kt2 * t * t, nktt = kt * t;
+    const int start = (h *  job   ) / nb_jobs;
+    const int end   = (h * (job+1)) / nb_jobs;
+    const int ylinesize = frame->linesize[0];
+    const int ulinesize = frame->linesize[1];
+    const int vlinesize = frame->linesize[2];
+    const int xreset = -(w / 2) - test->xo;
+    const int yreset = -(h / 2) - test->yo + start;
+    const int kU = test->kU, kV = test->kV;
+    const int skxy = 0xffff / (w / 2);
+    const int skx2 = 0xffff / w;
+    const int dkxt = kxt * t;
+    int akx, akxt, aky, akyt;
+    uint8_t *ydst = frame->data[0] + start * ylinesize;
+    uint8_t *udst = frame->data[1] + start * ulinesize;
+    uint8_t *vdst = frame->data[2] + start * vlinesize;
+    const uint8_t *lut = test->lut;
+
+    aky = start * ky;
+    akyt = start * kyt * t;
+
+    for (int j = start, y = yreset; j < end; j++, y++) {
+        const int dkxy = kxy * y * skxy;
+        const int nky2kt2 = (ky2 * y * y) / h + (nkt2t >> 1);
+        int akxy = dkxy * xreset;
+
+        akx = 0;
+        akxt = 0;
+        aky += ky;
+        akyt += kyt * t;
+        for (int i = 0, x = xreset; i < w; i++, x++) {
+            int phase = k0, uphase = kU, vphase = kV;
+
+            akx += kx;
+            phase += akx + aky + nktt;
+
+            akxt += dkxt;
+            akxy += dkxy;
+            phase += akxt + akyt;
+            phase += akxy >> 16;
+            phase += ((kx2 * x * x * skx2) >> 16) + nky2kt2;
+            uphase += phase;
+            vphase += phase;
+
+            ydst[i] = lut[phase  & lut_mask];
+            udst[i] = lut[uphase & lut_mask];
+            vdst[i] = lut[vphase & lut_mask];
+        }
+
+        ydst += ylinesize;
+        udst += ulinesize;
+        vdst += vlinesize;
+    }
+}
+
+static void zoneplate_fill_picture(AVFilterContext *ctx, AVFrame *frame)
+{
+    ff_filter_execute(ctx, zoneplate_fill_slice, frame, NULL,
+                      FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
+}
+
+static av_cold int zoneplate_init(AVFilterContext *ctx)
+{
+    TestSourceContext *test = ctx->priv;
+    const int lut_size = 1 << test->lut_precision;
+
+    test->lut = av_calloc(lut_size, sizeof(*test->lut));
+    if (!test->lut)
+        return AVERROR(ENOMEM);
+
+    for (int i = 0; i < lut_size; i++)
+        test->lut[i] = lrintf(255.f * (0.5f + 0.5f * sinf((2.f * M_PI * i) / lut_size)));
+
+    test->draw_once = 0;
+    test->fill_picture_fn = zoneplate_fill_picture;
+    return init(ctx);
+}
+
+static const AVFilterPad avfilter_vsrc_zoneplate_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .config_props  = zoneplate_config_props,
+    },
+};
+
+const AVFilter ff_vsrc_zoneplate = {
+    .name          = "zoneplate",
+    .description   = NULL_IF_CONFIG_SMALL("Generate zone-plate."),
+    .priv_size     = sizeof(TestSourceContext),
+    .priv_class    = &zoneplate_class,
+    .init          = zoneplate_init,
+    .uninit        = uninit,
+    .activate      = activate,
+    .inputs        = NULL,
+    FILTER_OUTPUTS(avfilter_vsrc_zoneplate_outputs),
+    FILTER_SINGLE_PIXFMT(AV_PIX_FMT_YUV444P),
+    .flags         = AVFILTER_FLAG_SLICE_THREADS,
+    .process_command = ff_filter_process_command,
+};
+
+#endif /* CONFIG_COLORCHART_FILTER */
-- 
2.39.1


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