lavfi: port MP il filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -15,6 +15,7 @@ version <next>:
 - improved showspectrum filter, with multichannel support and sox-like colors
 - histogram filter
 - tee muxer
+- il filter ported from libmpcodecs
 
 
 version 1.1:

doc/filters.texi

@@ -4648,6 +4648,43 @@ Useful for enlarging pixel art images without reducing sharpness.
 @section swapuv
 Swap U & V plane.
 
+@section il
+Deinterleave or interleave fields.
+
+This filter allows to process interlaced images fields without
+deinterlacing them. Deinterleaving splits the input frame into 2
+fields (so called half pictures). Odd lines are moved to the top
+half of the output image, even lines to the bottom half.
+You can process (filter) them independently and then re-interleave them.
+
+It accepts a list of options in the form of @var{key}=@var{value} pairs
+separated by ":". A description of the accepted options follows.
+
+@table @option
+@item luma_mode, l
+@item chroma_mode, s
+@item alpha_mode, a
+Available values for @var{luma_mode}, @var{chroma_mode} and
+@var{alpha_mode} are:
+
+@table @samp
+@item none
+Do nothing.
+
+@item deinterleave, d
+Deinterleave fields, placing one above the other.
+
+@item interleave, i
+Interleave fields. Reversing effect of deinterleave.
+@end table
+Default value is @code{none}.
+
+@item luma_swap, ls
+@item chroma_swap, cs
+@item alpha_swap, as
+Swap luma/chroma/alpha fields. Exchange even & odd lines. Default value is @code{0}.
+@end table
+
 @section thumbnail
 Select the most representative frame in a given sequence of consecutive frames.
 

libavfilter/Makefile

@@ -126,6 +126,7 @@ OBJS-$(CONFIG_HISTOGRAM_FILTER)              += vf_histogram.o
 OBJS-$(CONFIG_HQDN3D_FILTER)                 += vf_hqdn3d.o
 OBJS-$(CONFIG_HUE_FILTER)                    += vf_hue.o
 OBJS-$(CONFIG_IDET_FILTER)                   += vf_idet.o
+OBJS-$(CONFIG_IL_FILTER)                     += vf_il.o
 OBJS-$(CONFIG_KERNDEINT_FILTER)              += vf_kerndeint.o
 OBJS-$(CONFIG_LUT_FILTER)                    += vf_lut.o
 OBJS-$(CONFIG_LUTRGB_FILTER)                 += vf_lut.o

libavfilter/allfilters.c

@@ -120,6 +120,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(HQDN3D,         hqdn3d,         vf);
     REGISTER_FILTER(HUE,            hue,            vf);
     REGISTER_FILTER(IDET,           idet,           vf);
+    REGISTER_FILTER(IL,             il,             vf);
     REGISTER_FILTER(KERNDEINT,      kerndeint,      vf);
     REGISTER_FILTER(LUT,            lut,            vf);
     REGISTER_FILTER(LUTRGB,         lutrgb,         vf);

libavfilter/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  36
+#define LIBAVFILTER_VERSION_MINOR  37
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_il.c

+/*
+ * Copyright (c) 2002 Michael Niedmayer
+ * Copyright (c) 2013 Paul B Mahol
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * (de)interleave fields filter
+ */
+
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "internal.h"
+
+enum FilterMode {
+    MODE_NONE,
+    MODE_INTERLEAVE,
+    MODE_DEINTERLEAVE
+};
+
+typedef struct {
+    const AVClass *class;
+    enum FilterMode luma_mode, chroma_mode, alpha_mode;
+    int luma_swap, chroma_swap, alpha_swap;
+    int nb_planes;
+    int chroma_width, chroma_height;
+    int width;
+} IlContext;
+
+#define OFFSET(x) offsetof(IlContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption il_options[] = {
+    {"luma_mode",   "select luma mode", OFFSET(luma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "luma_mode"},
+    {"l",           "select luma mode", OFFSET(luma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "luma_mode"},
+    {"none",         NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE},         0, 0, FLAGS, "luma_mode"},
+    {"interleave",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE},   0, 0, FLAGS, "luma_mode"},
+    {"i",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE},   0, 0, FLAGS, "luma_mode"},
+    {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "luma_mode"},
+    {"d",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "luma_mode"},
+    {"chroma_mode", "select chroma mode", OFFSET(chroma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "chroma_mode"},
+    {"c",           "select chroma mode", OFFSET(chroma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "chroma_mode"},
+    {"none",         NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE},         0, 0, FLAGS, "chroma_mode"},
+    {"interleave",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE},   0, 0, FLAGS, "chroma_mode"},
+    {"i",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE},   0, 0, FLAGS, "chroma_mode"},
+    {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "chroma_mode"},
+    {"d",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "chroma_mode"},
+    {"alpha_mode", "select alpha mode", OFFSET(alpha_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "alpha_mode"},
+    {"a",          "select alpha mode", OFFSET(alpha_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "alpha_mode"},
+    {"none",         NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE},         0, 0, FLAGS, "alpha_mode"},
+    {"interleave",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE},   0, 0, FLAGS, "alpha_mode"},
+    {"i",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE},   0, 0, FLAGS, "alpha_mode"},
+    {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "alpha_mode"},
+    {"d",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "alpha_mode"},
+    {"luma_swap",   "swap luma fields",   OFFSET(luma_swap),   AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+    {"ls",          "swap luma fields",   OFFSET(luma_swap),   AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+    {"chroma_swap", "swap chroma fields", OFFSET(chroma_swap), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+    {"cs",          "swap chroma fields", OFFSET(chroma_swap), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+    {"alpha_swap",  "swap alpha fields",  OFFSET(alpha_swap),  AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+    {"as",          "swap alpha fields",  OFFSET(alpha_swap),  AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+    {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(il);
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+    IlContext *il = ctx->priv;
+    int ret;
+
+    il->class = &il_class;
+    av_opt_set_defaults(il);
+
+    if ((ret = av_set_options_string(il, args, "=", ":")) < 0)
+        return ret;
+
+    return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    IlContext *il = inlink->dst->priv;
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    int bpp = av_get_padded_bits_per_pixel(desc) >> 3;
+    int bytes = FFALIGN(desc->comp[0].depth_minus1 + 1, 8) / 8;
+    int i;
+
+    for (i = 0; i < desc->nb_components; i++)
+        il->nb_planes = FFMAX(il->nb_planes, desc->comp[i].plane);
+    il->nb_planes++;
+
+    il->chroma_height = inlink->h >> desc->log2_chroma_h;
+    il->chroma_width  = (inlink->w >> desc->log2_chroma_w) * bytes;
+    il->width         = inlink->w * bytes;
+    if (!(desc->flags & PIX_FMT_PLANAR))
+        il->width *= bpp;
+
+    return 0;
+}
+
+static void interleave(uint8_t *dst, uint8_t *src, int w, int h,
+                       int dst_linesize, int src_linesize,
+                       enum FilterMode mode, int swap)
+{
+    const int a = swap;
+    const int b = 1 - a;
+    const int m = h >> 1;
+    int y;
+
+    switch (mode) {
+    case MODE_DEINTERLEAVE:
+        for (y = 0; y < m; y++) {
+            memcpy(dst + dst_linesize *  y     , src + src_linesize * (y * 2 + a), w);
+            memcpy(dst + dst_linesize * (y + m), src + src_linesize * (y * 2 + b), w);
+        }
+        break;
+    case MODE_NONE:
+        for (y = 0; y < m; y++) {
+            memcpy(dst + dst_linesize *  y * 2     , src + src_linesize * (y * 2 + a), w);
+            memcpy(dst + dst_linesize * (y * 2 + 1), src + src_linesize * (y * 2 + b), w);
+        }
+        break;
+    case MODE_INTERLEAVE:
+        for (y = 0; y < m; y++) {
+            memcpy(dst + dst_linesize * (y * 2 + a), src + src_linesize *  y     , w);
+            memcpy(dst + dst_linesize * (y * 2 + b), src + src_linesize * (y + m), w);
+        }
+        break;
+    }
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+{
+    IlContext *il = inlink->dst->priv;
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+    AVFilterBufferRef *out;
+    int ret;
+
+    out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+    if (!out) {
+        avfilter_unref_bufferp(&inpicref);
+        return AVERROR(ENOMEM);
+    }
+    avfilter_copy_buffer_ref_props(out, inpicref);
+
+    interleave(out->data[0], inpicref->data[0],
+               il->width, inlink->h,
+               out->linesize[0], inpicref->linesize[0],
+               il->luma_mode, il->luma_swap);
+
+    if (il->nb_planes > 2) {
+        interleave(out->data[1], inpicref->data[1],
+                   il->chroma_width, il->chroma_height,
+                   out->linesize[1], inpicref->linesize[1],
+                   il->chroma_mode, il->chroma_swap);
+        interleave(out->data[2], inpicref->data[2],
+                   il->chroma_width, il->chroma_height,
+                   out->linesize[2], inpicref->linesize[2],
+                   il->chroma_mode, il->chroma_swap);
+    }
+    if (il->nb_planes == 2 && il->nb_planes == 4) {
+        int comp = il->nb_planes - 1;
+        interleave(out->data[comp], inpicref->data[comp],
+                   il->width, inlink->h,
+                   out->linesize[comp], inpicref->linesize[comp],
+                   il->alpha_mode, il->alpha_swap);
+    }
+
+    ret = ff_filter_frame(outlink, out);
+    avfilter_unref_bufferp(&inpicref);
+    return ret;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats = NULL;
+    int fmt;
+
+    for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
+        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
+        if (!(desc->flags & PIX_FMT_PAL ||
+            fmt == AV_PIX_FMT_NV21 ||
+            fmt == AV_PIX_FMT_NV12))
+            ff_add_format(&formats, fmt);
+    }
+
+    ff_set_common_formats(ctx, formats);
+    return 0;
+}
+
+static const AVFilterPad inputs[] = {
+    {
+        .name             = "default",
+        .type             = AVMEDIA_TYPE_VIDEO,
+        .get_video_buffer = ff_null_get_video_buffer,
+        .filter_frame     = filter_frame,
+        .config_props     = config_input,
+    },
+    { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter avfilter_vf_il = {
+    .name          = "il",
+    .description   = NULL_IF_CONFIG_SMALL("Deinterleave or interleave fields."),
+    .priv_size     = sizeof(IlContext),
+    .init          = init,
+    .query_formats = query_formats,
+    .inputs        = inputs,
+    .outputs       = outputs,
+    .priv_class    = &il_class,
+};