avfilter: add BobWeaver deinterlacing filter

6 files changed, 682 insertions, 1 deletions

diff --git a/Changelog b/Changelog
index b59db9225e..7d672fbdf6 100644
--- a/Changelog
+++ b/Changelog
@@ -5,6 +5,7 @@ version <next>:
 - DXVA2-accelerated HEVC Main10 decoding
 - fieldhint filter
 - loop video filter and aloop audio filter
+- Bob Weaver deinterlacing filter
 
 
 version 3.0:
diff --git a/doc/filters.texi b/doc/filters.texi
index d5ff21cd5b..c533ef7953 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -4256,6 +4256,59 @@ tblend=all_mode=difference128
 @end example
 @end itemize
 
+@section bwdif
+
+Deinterlace the input video ("bwdif" stands for "Bob Weaver
+Deinterlacing Filter").
+
+Motion adaptive deinterlacing based on yadif with the use of w3fdif and cubic
+interpolation algorithms.
+It accepts the following parameters:
+
+@table @option
+@item mode
+The interlacing mode to adopt. It accepts one of the following values:
+
+@table @option
+@item 0, send_frame
+Output one frame for each frame.
+@item 1, send_field
+Output one frame for each field.
+@end table
+
+The default value is @code{send_field}.
+
+@item parity
+The picture field parity assumed for the input interlaced video. It accepts one
+of the following values:
+
+@table @option
+@item 0, tff
+Assume the top field is first.
+@item 1, bff
+Assume the bottom field is first.
+@item -1, 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. Accept one of the following
+values:
+
+@table @option
+@item 0, all
+Deinterlace all frames.
+@item 1, interlaced
+Only deinterlace frames marked as interlaced.
+@end table
+
+The default value is @code{all}.
+@end table
+
 @section boxblur
 
 Apply a boxblur algorithm to the input video.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 082ec49c5b..10c2e0bdb7 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -119,6 +119,7 @@ OBJS-$(CONFIG_BLACKDETECT_FILTER)            += vf_blackdetect.o
 OBJS-$(CONFIG_BLACKFRAME_FILTER)             += vf_blackframe.o
 OBJS-$(CONFIG_BLEND_FILTER)                  += vf_blend.o dualinput.o framesync.o
 OBJS-$(CONFIG_BOXBLUR_FILTER)                += vf_boxblur.o
+OBJS-$(CONFIG_BWDIF_FILTER)                  += vf_bwdif.o
 OBJS-$(CONFIG_CHROMAKEY_FILTER)              += vf_chromakey.o
 OBJS-$(CONFIG_CODECVIEW_FILTER)              += vf_codecview.o
 OBJS-$(CONFIG_COLORBALANCE_FILTER)           += vf_colorbalance.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 4bce2afc4a..ed526493f8 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -140,6 +140,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(BLACKFRAME,     blackframe,     vf);
     REGISTER_FILTER(BLEND,          blend,          vf);
     REGISTER_FILTER(BOXBLUR,        boxblur,        vf);
+    REGISTER_FILTER(BWDIF,          bwdif,          vf);
     REGISTER_FILTER(CHROMAKEY,      chromakey,      vf);
     REGISTER_FILTER(CODECVIEW,      codecview,      vf);
     REGISTER_FILTER(COLORBALANCE,   colorbalance,   vf);
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 7dc1033a42..4a462e7097 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  33
+#define LIBAVFILTER_VERSION_MINOR  34
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_bwdif.c b/libavfilter/vf_bwdif.c
new file mode 100644
index 0000000000..79850545a0
--- /dev/null
+++ b/libavfilter/vf_bwdif.c
@@ -0,0 +1,625 @@
+/*
+ * BobWeaver Deinterlacing Filter
+ * Copyright (C) 2016 Thomas Mundt <loudmax@yahoo.de>
+ *
+ * Based on YADIF (Yet Another Deinterlacing Filter)
+ * Copyright (C) 2006-2011 Michael Niedermayer <michaelni@gmx.at>
+ *               2010      James Darnley <james.darnley@gmail.com>
+ *
+ * With use of Weston 3 Field Deinterlacing Filter algorithm
+ * Copyright (C) 2012 British Broadcasting Corporation, All Rights Reserved
+ * Author of de-interlace algorithm: Jim Easterbrook for BBC R&D
+ * Based on the process described by Martin Weston for BBC R&D
+ *
+ * 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/avassert.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/imgutils.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+/*
+ * Filter coefficients coef_lf and coef_hf taken from BBC PH-2071 (Weston 3 Field Deinterlacer).
+ * Used when there is spatial and temporal interpolation.
+ * Filter coefficients coef_sp are used when there is spatial interpolation only.
+ * Adjusted for matching visual sharpness impression of spatial and temporal interpolation.
+ */
+static const uint16_t coef_lf[2] = { 4309, 213 };
+static const uint16_t coef_hf[3] = { 5570, 3801, 1016 };
+static const uint16_t coef_sp[2] = { 5077, 981 };
+
+enum BWDIFMode {
+    BWDIF_MODE_SEND_FRAME = 0, ///< send 1 frame for each frame
+    BWDIF_MODE_SEND_FIELD = 1, ///< send 1 frame for each field
+};
+
+enum BWDIFParity {
+    BWDIF_PARITY_TFF  =  0, ///< top field first
+    BWDIF_PARITY_BFF  =  1, ///< bottom field first
+    BWDIF_PARITY_AUTO = -1, ///< auto detection
+};
+
+enum BWDIFDeint {
+    BWDIF_DEINT_ALL        = 0, ///< deinterlace all frames
+    BWDIF_DEINT_INTERLACED = 1, ///< only deinterlace frames marked as interlaced
+};
+
+typedef struct BWDIFContext {
+    const AVClass *class;
+
+    int mode;           ///< BWDIFMode
+    int parity;         ///< BWDIFParity
+    int deint;          ///< BWDIFDeint
+
+    int frame_pending;
+
+    AVFrame *cur;
+    AVFrame *next;
+    AVFrame *prev;
+    AVFrame *out;
+
+    void (*filter_intra)(void *dst1, void *cur1, int w, int prefs, int mrefs,
+                         int prefs3, int mrefs3, int parity, int clip_max);
+    void (*filter_line)(void *dst, void *prev, void *cur, void *next,
+                        int w, int prefs, int mrefs, int prefs2, int mrefs2,
+                        int prefs3, int mrefs3, int prefs4, int mrefs4,
+                        int parity, int clip_max);
+    void (*filter_edge)(void *dst, void *prev, void *cur, void *next,
+                        int w, int prefs, int mrefs, int prefs2, int mrefs2,
+                        int parity, int clip_max, int spat);
+
+    const AVPixFmtDescriptor *csp;
+    int inter_field;
+    int eof;
+} BWDIFContext;
+
+typedef struct ThreadData {
+    AVFrame *frame;
+    int plane;
+    int w, h;
+    int parity;
+    int tff;
+} ThreadData;
+
+#define FILTER_INTRA() \
+    for (x = 0; x < w; x++) { \
+        interpol = (coef_sp[0] * (cur[mrefs] + cur[prefs]) - coef_sp[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
+        dst[0] = av_clip(interpol, 0, clip_max); \
+ \
+        dst++; \
+        cur++; \
+    }
+
+#define FILTER1() \
+    for (x = 0; x < w; x++) { \
+        int c = cur[mrefs]; \
+        int d = (prev2[0] + next2[0]) >> 1; \
+        int e = cur[prefs]; \
+        int temporal_diff0 = FFABS(prev2[0] - next2[0]); \
+        int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e)) >> 1; \
+        int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e)) >> 1; \
+        int diff = FFMAX3(temporal_diff0 >> 1, temporal_diff1, temporal_diff2); \
+ \
+        if (!diff) { \
+            dst[0] = d; \
+        } else {
+
+#define SPAT_CHECK() \
+            int b = ((prev2[mrefs2] + next2[mrefs2]) >> 1) - c; \
+            int f = ((prev2[prefs2] + next2[prefs2]) >> 1) - e; \
+            int dc = d - c; \
+            int de = d - e; \
+            int max = FFMAX3(de, dc, FFMIN(b, f)); \
+            int min = FFMIN3(de, dc, FFMAX(b, f)); \
+            diff = FFMAX3(diff, min, -max);
+
+#define FILTER_LINE() \
+            SPAT_CHECK() \
+            if (FFABS(c - e) > temporal_diff0) { \
+                interpol = (((coef_hf[0] * (prev2[0] + next2[0]) \
+                    - coef_hf[1] * (prev2[mrefs2] + next2[mrefs2] + prev2[prefs2] + next2[prefs2]) \
+                    + coef_hf[2] * (prev2[mrefs4] + next2[mrefs4] + prev2[prefs4] + next2[prefs4])) >> 2) \
+                    + coef_lf[0] * (c + e) - coef_lf[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
+            } else { \
+                interpol = (coef_sp[0] * (c + e) - coef_sp[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
+            }
+
+#define FILTER_EDGE() \
+            if (spat) { \
+                SPAT_CHECK() \
+            } \
+            interpol = (c + e) >> 1;
+
+#define FILTER2() \
+            if (interpol > d + diff) \
+                interpol = d + diff; \
+            else if (interpol < d - diff) \
+                interpol = d - diff; \
+ \
+            dst[0] = av_clip(interpol, 0, clip_max); \
+        } \
+ \
+        dst++; \
+        cur++; \
+        prev++; \
+        next++; \
+        prev2++; \
+        next2++; \
+    }
+
+static void filter_intra(void *dst1, void *cur1, int w, int prefs, int mrefs,
+                         int prefs3, int mrefs3, int parity, int clip_max)
+{
+    uint8_t *dst = dst1;
+    uint8_t *cur = cur1;
+    int interpol, x;
+
+    FILTER_INTRA()
+}
+
+static void filter_line(void *dst1, void *prev1, void *cur1, void *next1,
+                        int w, int prefs, int mrefs, int prefs2, int mrefs2,
+                        int prefs3, int mrefs3, int prefs4, int mrefs4,
+                        int parity, int clip_max)
+{
+    uint8_t *dst   = dst1;
+    uint8_t *prev  = prev1;
+    uint8_t *cur   = cur1;
+    uint8_t *next  = next1;
+    uint8_t *prev2 = parity ? prev : cur ;
+    uint8_t *next2 = parity ? cur  : next;
+    int interpol, x;
+
+    FILTER1()
+    FILTER_LINE()
+    FILTER2()
+}
+
+static void filter_edge(void *dst1, void *prev1, void *cur1, void *next1,
+                        int w, int prefs, int mrefs, int prefs2, int mrefs2,
+                        int parity, int clip_max, int spat)
+{
+    uint8_t *dst   = dst1;
+    uint8_t *prev  = prev1;
+    uint8_t *cur   = cur1;
+    uint8_t *next  = next1;
+    uint8_t *prev2 = parity ? prev : cur ;
+    uint8_t *next2 = parity ? cur  : next;
+    int interpol, x;
+
+    FILTER1()
+    FILTER_EDGE()
+    FILTER2()
+}
+
+static void filter_intra_16bit(void *dst1, void *cur1, int w, int prefs, int mrefs,
+                               int prefs3, int mrefs3, int parity, int clip_max)
+{
+    uint16_t *dst = dst1;
+    uint16_t *cur = cur1;
+    int interpol, x;
+
+    FILTER_INTRA()
+}
+
+static void filter_line_16bit(void *dst1, void *prev1, void *cur1, void *next1,
+                              int w, int prefs, int mrefs, int prefs2, int mrefs2,
+                              int prefs3, int mrefs3, int prefs4, int mrefs4,
+                              int parity, int clip_max)
+{
+    uint16_t *dst   = dst1;
+    uint16_t *prev  = prev1;
+    uint16_t *cur   = cur1;
+    uint16_t *next  = next1;
+    uint16_t *prev2 = parity ? prev : cur ;
+    uint16_t *next2 = parity ? cur  : next;
+    int interpol, x;
+
+    FILTER1()
+    FILTER_LINE()
+    FILTER2()
+}
+
+static void filter_edge_16bit(void *dst1, void *prev1, void *cur1, void *next1,
+                              int w, int prefs, int mrefs, int prefs2, int mrefs2,
+                              int parity, int clip_max, int spat)
+{
+    uint16_t *dst   = dst1;
+    uint16_t *prev  = prev1;
+    uint16_t *cur   = cur1;
+    uint16_t *next  = next1;
+    uint16_t *prev2 = parity ? prev : cur ;
+    uint16_t *next2 = parity ? cur  : next;
+    int interpol, x;
+
+    FILTER1()
+    FILTER_EDGE()
+    FILTER2()
+}
+
+static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+    BWDIFContext *s = ctx->priv;
+    ThreadData *td  = arg;
+    int linesize = s->cur->linesize[td->plane];
+    int clip_max = (1 << (s->csp->comp[td->plane].depth)) - 1;
+    int df = (s->csp->comp[td->plane].depth + 7) / 8;
+    int refs = linesize / df;
+    int slice_start = (td->h *  jobnr   ) / nb_jobs;
+    int slice_end   = (td->h * (jobnr+1)) / nb_jobs;
+    int y;
+
+    for (y = slice_start; y < slice_end; y++) {
+        if ((y ^ td->parity) & 1) {
+            uint8_t *prev = &s->prev->data[td->plane][y * linesize];
+            uint8_t *cur  = &s->cur ->data[td->plane][y * linesize];
+            uint8_t *next = &s->next->data[td->plane][y * linesize];
+            uint8_t *dst  = &td->frame->data[td->plane][y * td->frame->linesize[td->plane]];
+            if (!s->inter_field) {
+                s->filter_intra(dst, cur, td->w, (y + df) < td->h ? refs : -refs,
+                                y > (df - 1) ? -refs : refs,
+                                (y + 3*df) < td->h ? 3 * refs : -refs,
+                                y > (3*df - 1) ? -3 * refs : refs,
+                                td->parity ^ td->tff, clip_max);
+            } else if ((y < 4) || ((y + 5) > td->h)) {
+                s->filter_edge(dst, prev, cur, next, td->w,
+                               (y + df) < td->h ? refs : -refs,
+                               y > (df - 1) ? -refs : refs,
+                               refs << 1, -(refs << 1),
+                               td->parity ^ td->tff, clip_max,
+                               (y < 2) || ((y + 3) > td->h) ? 0 : 1);
+            } else {
+                s->filter_line(dst, prev, cur, next, td->w,
+                               refs, -refs, refs << 1, -(refs << 1),
+                               3 * refs, -3 * refs, refs << 2, -(refs << 2),
+                               td->parity ^ td->tff, clip_max);
+            }
+        } else {
+            memcpy(&td->frame->data[td->plane][y * td->frame->linesize[td->plane]],
+                   &s->cur->data[td->plane][y * linesize], td->w * df);
+        }
+    }
+    return 0;
+}
+
+static void filter(AVFilterContext *ctx, AVFrame *dstpic,
+                   int parity, int tff)
+{
+    BWDIFContext *bwdif = ctx->priv;
+    ThreadData td = { .frame = dstpic, .parity = parity, .tff = tff };
+    int i;
+
+    for (i = 0; i < bwdif->csp->nb_components; i++) {
+        int w = dstpic->width;
+        int h = dstpic->height;
+
+        if (i == 1 || i == 2) {
+            w = AV_CEIL_RSHIFT(w, bwdif->csp->log2_chroma_w);
+            h = AV_CEIL_RSHIFT(h, bwdif->csp->log2_chroma_h);
+        }
+
+        td.w     = w;
+        td.h     = h;
+        td.plane = i;
+
+        ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(h, ctx->graph->nb_threads));
+    }
+    if (!bwdif->inter_field) {
+        bwdif->inter_field = 1;
+    }
+
+    emms_c();
+}
+
+static int return_frame(AVFilterContext *ctx, int is_second)
+{
+    BWDIFContext *bwdif = ctx->priv;
+    AVFilterLink *link  = ctx->outputs[0];
+    int tff, ret;
+
+    if (bwdif->parity == -1) {
+        tff = bwdif->cur->interlaced_frame ?
+              bwdif->cur->top_field_first : 1;
+    } else {
+        tff = bwdif->parity ^ 1;
+    }
+
+    if (is_second) {
+        bwdif->out = ff_get_video_buffer(link, link->w, link->h);
+        if (!bwdif->out)
+            return AVERROR(ENOMEM);
+
+        av_frame_copy_props(bwdif->out, bwdif->cur);
+        bwdif->out->interlaced_frame = 0;
+        if (bwdif->inter_field < 0)
+            bwdif->inter_field = 0;
+    }
+
+    filter(ctx, bwdif->out, tff ^ !is_second, tff);
+
+    if (is_second) {
+        int64_t cur_pts  = bwdif->cur->pts;
+        int64_t next_pts = bwdif->next->pts;
+
+        if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) {
+            bwdif->out->pts = cur_pts + next_pts;
+        } else {
+            bwdif->out->pts = AV_NOPTS_VALUE;
+        }
+    }
+    ret = ff_filter_frame(ctx->outputs[0], bwdif->out);
+
+    bwdif->frame_pending = (bwdif->mode&1) && !is_second;
+    return ret;
+}
+
+static int checkstride(BWDIFContext *bwdif, const AVFrame *a, const AVFrame *b)
+{
+    int i;
+    for (i = 0; i < bwdif->csp->nb_components; i++)
+        if (a->linesize[i] != b->linesize[i])
+            return 1;
+    return 0;
+}
+
+static void fixstride(AVFilterLink *link, AVFrame *f)
+{
+    AVFrame *dst = ff_default_get_video_buffer(link, f->width, f->height);
+    if(!dst)
+        return;
+    av_frame_copy_props(dst, f);
+    av_image_copy(dst->data, dst->linesize,
+                  (const uint8_t **)f->data, f->linesize,
+                  dst->format, dst->width, dst->height);
+    av_frame_unref(f);
+    av_frame_move_ref(f, dst);
+    av_frame_free(&dst);
+}
+
+static int filter_frame(AVFilterLink *link, AVFrame *frame)
+{
+    AVFilterContext *ctx = link->dst;
+    BWDIFContext *bwdif = ctx->priv;
+
+    av_assert0(frame);
+
+    if (bwdif->frame_pending)
+        return_frame(ctx, 1);
+
+    if (bwdif->prev)
+        av_frame_free(&bwdif->prev);
+    bwdif->prev = bwdif->cur;
+    bwdif->cur  = bwdif->next;
+    bwdif->next = frame;
+
+    if (!bwdif->cur) {
+        bwdif->cur = av_frame_clone(bwdif->next);
+        if (!bwdif->cur)
+            return AVERROR(ENOMEM);
+        bwdif->inter_field = 0;
+    }
+
+    if (checkstride(bwdif, bwdif->next, bwdif->cur)) {
+        av_log(ctx, AV_LOG_VERBOSE, "Reallocating frame due to differing stride\n");
+        fixstride(link, bwdif->next);
+    }
+    if (checkstride(bwdif, bwdif->next, bwdif->cur))
+        fixstride(link, bwdif->cur);
+    if (bwdif->prev && checkstride(bwdif, bwdif->next, bwdif->prev))
+        fixstride(link, bwdif->prev);
+    if (checkstride(bwdif, bwdif->next, bwdif->cur) || (bwdif->prev && checkstride(bwdif, bwdif->next, bwdif->prev))) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to reallocate frame\n");
+        return -1;
+    }
+
+    if (!bwdif->prev)
+        return 0;
+
+    if ((bwdif->deint && !bwdif->cur->interlaced_frame) ||
+        ctx->is_disabled ||
+        (bwdif->deint && !bwdif->prev->interlaced_frame && bwdif->prev->repeat_pict) ||
+        (bwdif->deint && !bwdif->next->interlaced_frame && bwdif->next->repeat_pict)
+    ) {
+        bwdif->out  = av_frame_clone(bwdif->cur);
+        if (!bwdif->out)
+            return AVERROR(ENOMEM);
+
+        av_frame_free(&bwdif->prev);
+        if (bwdif->out->pts != AV_NOPTS_VALUE)
+            bwdif->out->pts *= 2;
+        return ff_filter_frame(ctx->outputs[0], bwdif->out);
+    }
+
+    bwdif->out = ff_get_video_buffer(ctx->outputs[0], link->w, link->h);
+    if (!bwdif->out)
+        return AVERROR(ENOMEM);
+
+    av_frame_copy_props(bwdif->out, bwdif->cur);
+    bwdif->out->interlaced_frame = 0;
+
+    if (bwdif->out->pts != AV_NOPTS_VALUE)
+        bwdif->out->pts *= 2;
+
+    return return_frame(ctx, 0);
+}
+
+static int request_frame(AVFilterLink *link)
+{
+    AVFilterContext *ctx = link->src;
+    BWDIFContext *bwdif = ctx->priv;
+    int ret;
+
+    if (bwdif->frame_pending) {
+        return_frame(ctx, 1);
+        return 0;
+    }
+
+    if (bwdif->eof)
+        return AVERROR_EOF;
+
+    ret  = ff_request_frame(link->src->inputs[0]);
+
+    if (ret == AVERROR_EOF && bwdif->cur) {
+        AVFrame *next = av_frame_clone(bwdif->next);
+
+        if (!next)
+            return AVERROR(ENOMEM);
+
+        bwdif->inter_field = -1;
+        next->pts = bwdif->next->pts * 2 - bwdif->cur->pts;
+
+        filter_frame(link->src->inputs[0], next);
+        bwdif->eof = 1;
+    } else if (ret < 0) {
+        return ret;
+    }
+
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    BWDIFContext *bwdif = ctx->priv;
+
+    av_frame_free(&bwdif->prev);
+    av_frame_free(&bwdif->cur );
+    av_frame_free(&bwdif->next);
+}
+
+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_YUVJ411P, AV_PIX_FMT_YUVJ420P,
+        AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
+        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_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
+        AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
+        AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
+        AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
+        AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
+        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
+        AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
+        AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP16,
+        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
+        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_props(AVFilterLink *link)
+{
+    AVFilterContext *ctx = link->src;
+    BWDIFContext *s = link->src->priv;
+
+    link->time_base.num = link->src->inputs[0]->time_base.num;
+    link->time_base.den = link->src->inputs[0]->time_base.den * 2;
+    link->w             = link->src->inputs[0]->w;
+    link->h             = link->src->inputs[0]->h;
+
+    if(s->mode&1)
+        link->frame_rate = av_mul_q(link->src->inputs[0]->frame_rate, (AVRational){2,1});
+
+    if (link->w < 3 || link->h < 3) {
+        av_log(ctx, AV_LOG_ERROR, "Video of less than 3 columns or lines is not supported\n");
+        return AVERROR(EINVAL);
+    }
+
+    s->csp = av_pix_fmt_desc_get(link->format);
+    if (s->csp->comp[0].depth > 8) {
+        s->filter_intra = filter_intra_16bit;
+        s->filter_line  = filter_line_16bit;
+        s->filter_edge  = filter_edge_16bit;
+    } else {
+        s->filter_intra = filter_intra;
+        s->filter_line  = filter_line;
+        s->filter_edge  = filter_edge;
+    }
+
+    return 0;
+}
+
+
+#define OFFSET(x) offsetof(BWDIFContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+#define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, INT_MIN, INT_MAX, FLAGS, unit }
+
+static const AVOption bwdif_options[] = {
+    { "mode",   "specify the interlacing mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BWDIF_MODE_SEND_FIELD}, 0, 1, FLAGS, "mode"},
+    CONST("send_frame", "send one frame for each frame", BWDIF_MODE_SEND_FRAME, "mode"),
+    CONST("send_field", "send one frame for each field", BWDIF_MODE_SEND_FIELD, "mode"),
+
+    { "parity", "specify the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=BWDIF_PARITY_AUTO}, -1, 1, FLAGS, "parity" },
+    CONST("tff",  "assume top field first",    BWDIF_PARITY_TFF,  "parity"),
+    CONST("bff",  "assume bottom field first", BWDIF_PARITY_BFF,  "parity"),
+    CONST("auto", "auto detect parity",        BWDIF_PARITY_AUTO, "parity"),
+
+    { "deint", "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=BWDIF_DEINT_INTERLACED}, 0, 1, FLAGS, "deint" },
+    CONST("all",        "deinterlace all frames",                       BWDIF_DEINT_ALL,        "deint"),
+    CONST("interlaced", "only deinterlace frames marked as interlaced", BWDIF_DEINT_INTERLACED, "deint"),
+
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(bwdif);
+
+static const AVFilterPad avfilter_vf_bwdif_inputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .filter_frame  = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad avfilter_vf_bwdif_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .request_frame = request_frame,
+        .config_props  = config_props,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_bwdif = {
+    .name          = "bwdif",
+    .description   = NULL_IF_CONFIG_SMALL("Deinterlace the input image."),
+    .priv_size     = sizeof(BWDIFContext),
+    .priv_class    = &bwdif_class,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = avfilter_vf_bwdif_inputs,
+    .outputs       = avfilter_vf_bwdif_outputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
+};