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[FFmpeg-devel] avfilter: add estdif video filter

Message ID 20201231151736.12042-1-onemda@gmail.com
State Superseded
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Series [FFmpeg-devel] avfilter: add estdif video filter
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Commit Message

Paul B Mahol Dec. 31, 2020, 3:17 p.m. UTC
Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
TODO: add working >8 depth support
---
 doc/filters.texi         |  56 ++++++
 libavfilter/Makefile     |   1 +
 libavfilter/allfilters.c |   1 +
 libavfilter/vf_estdif.c  | 372 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 430 insertions(+)
 create mode 100644 libavfilter/vf_estdif.c
diff mbox series

Patch

diff --git a/doc/filters.texi b/doc/filters.texi
index 01ae540c5c..d5cfb1b4ff 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -11065,6 +11065,62 @@  Flags to local 3x3 coordinates maps like this:
 
 This filter supports the all above options as @ref{commands}.
 
+@section estdif
+
+Deinterlace the input video ("estdif" stands for "Edge Slope
+Tracing Deinterlacing Filter").
+
+Spatial only filter that uses simple edge slope tracing algorithm
+to interpolate missing lines.
+It accepts the following parameters:
+
+@table @option
+@item mode
+The interlacing mode to adopt. It accepts one of the following values:
+
+@table @option
+@item frame
+Output one frame for each frame.
+@item field
+Output one frame for each field.
+@end table
+
+The default value is @code{field}.
+
+@item parity
+The picture field parity assumed for the input interlaced video. It accepts one
+of the following values:
+
+@table @option
+@item ff
+Assume the top field is first.
+@item bff
+Assume the bottom field is first.
+@item auto
+Enable automatic detection of field parity.
+@end table
+
+The default value is @code{auto}.
+If the interlacing is unknown or the decoder does not export this information,
+top field first will be assumed.
+
+@item deint
+Specify which frames to deinterlace. Accepts one of the following
+values:
+
+@table @option
+@item all
+Deinterlace all frames.
+@item interlaced
+Only deinterlace frames marked as interlaced.
+@end table
+
+The default value is @code{all}.
+@end table
+
+@subsection Commands
+This filter supports same @ref{commands} as options.
+
 @section extractplanes
 
 Extract color channel components from input video stream into
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 526da8d69e..7939381616 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -252,6 +252,7 @@  OBJS-$(CONFIG_EQ_FILTER)                     += vf_eq.o
 OBJS-$(CONFIG_EROSION_FILTER)                += vf_neighbor.o
 OBJS-$(CONFIG_EROSION_OPENCL_FILTER)         += vf_neighbor_opencl.o opencl.o \
                                                 opencl/neighbor.o
+OBJS-$(CONFIG_ESTDIF_FILTER)                 += vf_estdif.o
 OBJS-$(CONFIG_EXTRACTPLANES_FILTER)          += vf_extractplanes.o
 OBJS-$(CONFIG_FADE_FILTER)                   += vf_fade.o
 OBJS-$(CONFIG_FFTDNOIZ_FILTER)               += vf_fftdnoiz.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index ce317dfa1c..471844a603 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -237,6 +237,7 @@  extern AVFilter ff_vf_entropy;
 extern AVFilter ff_vf_eq;
 extern AVFilter ff_vf_erosion;
 extern AVFilter ff_vf_erosion_opencl;
+extern AVFilter ff_vf_estdif;
 extern AVFilter ff_vf_extractplanes;
 extern AVFilter ff_vf_fade;
 extern AVFilter ff_vf_fftdnoiz;
diff --git a/libavfilter/vf_estdif.c b/libavfilter/vf_estdif.c
new file mode 100644
index 0000000000..ec2cd42a96
--- /dev/null
+++ b/libavfilter/vf_estdif.c
@@ -0,0 +1,372 @@ 
+/*
+ * 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
+ */
+
+#include "libavutil/common.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct ESTDIFContext {
+    const AVClass *class;
+
+    int mode;             ///< 0 is frame, 1 is field
+    int parity;           ///< frame field parity
+    int deint;            ///< which frames to deinterlace
+    int linesize[4];      ///< bytes of pixel data per line for each plane
+    int planewidth[4];    ///< width of each plane
+    int planeheight[4];   ///< height of each plane
+    int field;            ///< which field are we on, 0 or 1
+    int eof;
+    int nb_planes;
+    int nb_threads;
+    int max;
+    int64_t pts;
+    AVFrame *prev;
+
+    int *work_line[4];
+} ESTDIFContext;
+
+#define OFFSET(x) offsetof(ESTDIFContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
+#define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit }
+
+static const AVOption estdif_options[] = {
+    { "mode", "specify the mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "mode" },
+    CONST("frame", NULL, 0, "mode"),
+    CONST("field", NULL, 1, "mode"),
+    { "parity", "specify the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, FLAGS, "parity" },
+    CONST("tff",  "assume top field first",    0, "parity"),
+    CONST("bff",  "assume bottom field first", 1, "parity"),
+    CONST("auto", "auto detect parity",       -1, "parity"),
+    { "deint",  "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "deint" },
+    CONST("all",        "deinterlace all frames",                       0, "deint"),
+    CONST("interlaced", "only deinterlace frames marked as interlaced", 1, "deint"),
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(estdif);
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
+        AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
+        AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
+        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
+        AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
+        AV_PIX_FMT_YUVJ411P,
+        AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
+        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
+        AV_PIX_FMT_GRAY8,
+        AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
+        AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
+        AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
+        AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
+        AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14,
+        AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
+        AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
+        AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
+        AV_PIX_FMT_GBRAP10,   AV_PIX_FMT_GBRAP12,    AV_PIX_FMT_GBRAP16,
+        AV_PIX_FMT_NONE
+    };
+
+    AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+    if (!fmts_list)
+        return AVERROR(ENOMEM);
+    return ff_set_common_formats(ctx, fmts_list);
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    ESTDIFContext *s = ctx->priv;
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    int ret, depth;
+
+    if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
+        return ret;
+
+    s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+    s->planeheight[0] = s->planeheight[3] = inlink->h;
+    s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+    s->planewidth[0] = s->planewidth[3] = inlink->w;
+
+    if (inlink->h < 3) {
+        av_log(ctx, AV_LOG_ERROR, "Video of less than 3 lines is not supported\n");
+        return AVERROR(EINVAL);
+    }
+
+    s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+    s->nb_threads = ff_filter_get_nb_threads(ctx);
+    depth = desc->comp[0].depth;
+    s->max = (1 << depth) - 1;
+
+    for (int plane = 0; plane < s->nb_planes; plane++) {
+        s->work_line[plane] = av_calloc(FFALIGN(s->planewidth[plane], 32) * s->nb_threads * 3, sizeof(*s->work_line[0]));
+        if (!s->work_line[plane])
+            return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    AVFilterLink *inlink = ctx->inputs[0];
+
+    outlink->time_base.num = inlink->time_base.num;
+    outlink->time_base.den = inlink->time_base.den * 2;
+    outlink->frame_rate.num = inlink->frame_rate.num * 2;
+    outlink->frame_rate.den = inlink->frame_rate.den;
+
+    return 0;
+}
+
+typedef struct ThreadData {
+    AVFrame *out, *in;
+} ThreadData;
+
+static void interpolate_dir(int *work_line, int *la,
+                            uint8_t *pprev_line, uint8_t *prev_line,
+                            uint8_t *next_line, int x, int width,
+                            int first, int *K, int *SMIN)
+{
+    const int px = FFMAX(0, x - 1);
+    const int nx = FFMIN(width - 1, x);
+    int d1 = FFABS(prev_line[px] - next_line[px]) +
+             FFABS(prev_line[x ] - next_line[x ]) +
+             FFABS(prev_line[nx] - next_line[nx]);
+    int d2 = FFABS(prev_line[px] - next_line[x ]) +
+             FFABS(prev_line[x ] - next_line[nx]);
+    int d3 = FFABS(prev_line[x ] - next_line[px]) +
+             FFABS(prev_line[nx] - next_line[x ]);
+    int k = *K;
+    int sprev = *SMIN;
+
+    if (FFMIN3(d1, d2, d3) < 20) {
+        work_line[x] = la[x];
+        k = 0;
+    } else {
+        int s0 = FFABS(prev_line[av_clip(x + k - 1, first, width - 1)] - next_line[av_clip(x - k + 1, first, width - 1)]);
+        int s1 = FFABS(prev_line[av_clip(x + k    , first, width - 1)] - next_line[av_clip(x - k    , first, width - 1)]);
+        int s2 = FFABS(prev_line[av_clip(x + k + 1, first, width - 1)] - next_line[av_clip(x - k - 1, first, width - 1)]);
+        int v, smin = FFMIN3(s0, s1, s2);
+
+        if (smin == s2)
+            k--;
+        else if (smin == s0)
+            k++;
+
+        if (FFABS(smin - sprev) > 10 && FFABS(k) > 1)
+            k = 0;
+
+        sprev = smin;
+        v = (prev_line[av_clip(x - k, 0, width - 1)] + next_line[av_clip(x + k, 0, width - 1)]) >> 1;
+        work_line[x] = v;
+    }
+
+    *K = k;
+    *SMIN = sprev;
+}
+
+static int deinterlace_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+    ESTDIFContext *s = ctx->priv;
+    ThreadData *td = arg;
+    AVFrame *out = td->out;
+    AVFrame *in = td->in;
+    const int field_first = s->parity == -1 ? !in->top_field_first : s->parity == 0 ? 1 : 0;
+
+    for (int plane = 0; plane < s->nb_planes; plane++) {
+        uint8_t *src_data = in->data[plane];
+        uint8_t *dst_data = out->data[plane];
+        const int linesize = s->linesize[plane];
+        const int width = s->planewidth[plane];
+        const int height = s->planeheight[plane];
+        const int src_linesize = in->linesize[plane];
+        const int dst_linesize = out->linesize[plane];
+        const int start = (((height / 2) * jobnr) / nb_jobs) * 2;
+        const int end = (((height / 2) * (jobnr+1)) / nb_jobs) * 2;
+        int *work_line0 = s->work_line[plane] + jobnr * 3 * width + 0 * width;
+        int *work_line1 = s->work_line[plane] + jobnr * 3 * width + 1 * width;
+        int *work_line2 = s->work_line[plane] + jobnr * 3 * width + 2 * width;
+        uint8_t *pprev_line, *prev_line, *next_line, *in_line;
+        uint8_t *out_line;
+        const int first = ((s->field == field_first) ^ (start & 1));
+        int y_out;
+
+        y_out = start + ((s->field == field_first) ^ (start & 1));
+
+        in_line  = src_data + (y_out * src_linesize);
+        out_line = dst_data + (y_out * dst_linesize);
+
+        while (y_out < end) {
+            memcpy(out_line, in_line, linesize);
+            y_out += 2;
+            in_line  += src_linesize * 2;
+            out_line += dst_linesize * 2;
+        }
+
+        y_out = start + ((s->field != field_first) ^ (start & 1));
+        out_line = dst_data + (y_out * dst_linesize);
+
+        for (int y = y_out; y < end; y += 2) {
+            int k, smin;
+
+            pprev_line = src_data + (FFMAX(first, y - 2) * src_linesize);
+            prev_line = src_data + (FFMAX(first, y - 1) * src_linesize);
+            next_line = src_data + (FFMIN(height - 1, y + 1) * src_linesize);
+
+            k = 0, smin = 0;
+            for (int x = 0; x < width; x++) {
+                work_line2[x] = (prev_line[x] + next_line[x]) >> 1;
+            }
+
+            for (int x = 0; x < width; x++) {
+                interpolate_dir(work_line0, work_line2,
+                                pprev_line, prev_line, next_line,
+                                x, width, first, &k, &smin);
+            }
+
+            k = 0, smin = 0;
+            for (int x = width - 1; x >= 0; x--) {
+                interpolate_dir(work_line1, work_line2,
+                                pprev_line, prev_line, next_line,
+                                x, width, first, &k, &smin);
+            }
+
+            for (int x = 0; x < width; x++) {
+                int dlr = FFABS(work_line0[x] - work_line2[x]);
+                int drl = FFABS(work_line1[x] - work_line2[x]);
+
+                if (dlr < drl)
+                    out_line[x] = work_line0[x];
+                else
+                    out_line[x] = work_line1[x];
+            }
+
+            out_line += 2 * dst_linesize;
+        }
+    }
+
+    return 0;
+}
+
+static int filter(AVFilterContext *ctx, int is_second, AVFrame *in)
+{
+    ESTDIFContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AVFrame *out;
+    ThreadData td;
+
+    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+    if (!out)
+        return AVERROR(ENOMEM);
+    av_frame_copy_props(out, in);
+    out->interlaced_frame = 0;
+    out->pts = s->pts;
+
+    td.out = out; td.in = in;
+    ctx->internal->execute(ctx, deinterlace_slice, &td, NULL,
+                           FFMIN(s->planeheight[1] / 2, s->nb_threads));
+
+    if (s->mode)
+        s->field = !s->field;
+
+    return ff_filter_frame(outlink, out);
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    ESTDIFContext *s = ctx->priv;
+    int ret;
+
+    if (!s->prev) {
+        s->prev = in;
+        return 0;
+    }
+
+    if ((s->deint && !in->interlaced_frame) || ctx->is_disabled) {
+        s->prev->pts *= 2;
+        ret = ff_filter_frame(ctx->outputs[0], s->prev);
+        s->prev = in;
+        return ret;
+    }
+
+    s->pts = s->prev->pts * 2;
+    ret = filter(ctx, 0, s->prev);
+    if (ret < 0 || s->mode == 0) {
+        av_frame_free(&s->prev);
+        s->prev = in;
+        return ret;
+    }
+
+    s->pts = s->prev->pts + in->pts;
+    ret = filter(ctx, 1, s->prev);
+    av_frame_free(&s->prev);
+    s->prev = in;
+    return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    ESTDIFContext *s = ctx->priv;
+
+    av_freep(&s->prev);
+
+    for (int i = 0; i < s->nb_planes; i++)
+        av_freep(&s->work_line[i]);
+}
+
+static const AVFilterPad estdif_inputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .filter_frame  = filter_frame,
+        .config_props  = config_input,
+    },
+    { NULL }
+};
+
+static const AVFilterPad estdif_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .config_props  = config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_estdif = {
+    .name          = "estdif",
+    .description   = NULL_IF_CONFIG_SMALL("Apply Edge Slope Tracing deinterlace."),
+    .priv_size     = sizeof(ESTDIFContext),
+    .priv_class    = &estdif_class,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = estdif_inputs,
+    .outputs       = estdif_outputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
+    .process_command = ff_filter_process_command,
+};