lavfi: port MP stereo3d filter

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

1 files changed, 478 insertions, 0 deletions

diff --git a/libavfilter/vf_stereo3d.c b/libavfilter/vf_stereo3d.c
new file mode 100644
index 0000000000..b47f4d8357
--- /dev/null
+++ b/libavfilter/vf_stereo3d.c
@@ -0,0 +1,478 @@
+/*
+ * Copyright (c) 2010 Gordon Schmidt <gordon.schmidt <at> s2000.tu-chemnitz.de>
+ * 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 General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+enum StereoCode {
+    ANAGLYPH_RC_GRAY,   // anaglyph red/cyan gray
+    ANAGLYPH_RC_HALF,   // anaglyph red/cyan half colored
+    ANAGLYPH_RC_COLOR,  // anaglyph red/cyan colored
+    ANAGLYPH_RC_DUBOIS, // anaglyph red/cyan dubois
+    ANAGLYPH_GM_GRAY,   // anaglyph green/magenta gray
+    ANAGLYPH_GM_HALF,   // anaglyph green/magenta half colored
+    ANAGLYPH_GM_COLOR,  // anaglyph green/magenta colored
+    ANAGLYPH_GM_DUBOIS, // anaglyph green/magenta dubois
+    ANAGLYPH_YB_GRAY,   // anaglyph yellow/blue gray
+    ANAGLYPH_YB_HALF,   // anaglyph yellow/blue half colored
+    ANAGLYPH_YB_COLOR,  // anaglyph yellow/blue colored
+    ANAGLYPH_YB_DUBOIS, // anaglyph yellow/blue dubois
+    ANAGLYPH_RB_GRAY,   // anaglyph red/blue gray
+    ANAGLYPH_RG_GRAY,   // anaglyph red/green gray
+    MONO_L,             // mono output for debugging (left eye only)
+    MONO_R,             // mono output for debugging (right eye only)
+    INTERLEAVE_ROWS_LR, // row-interleave (left eye has top row)
+    INTERLEAVE_ROWS_RL, // row-interleave (right eye has top row)
+    SIDE_BY_SIDE_LR,    // side by side parallel (left eye left, right eye right)
+    SIDE_BY_SIDE_RL,    // side by side crosseye (right eye left, left eye right)
+    SIDE_BY_SIDE_2_LR,  // side by side parallel with half width resolution
+    SIDE_BY_SIDE_2_RL,  // side by side crosseye with half width resolution
+    ABOVE_BELOW_LR,     // above-below (left eye above, right eye below)
+    ABOVE_BELOW_RL,     // above-below (right eye above, left eye below)
+    ABOVE_BELOW_2_LR,   // above-below with half height resolution
+    ABOVE_BELOW_2_RL,   // above-below with half height resolution
+    STEREO_CODE_COUNT   // TODO: needs autodetection
+};
+
+typedef struct StereoComponent {
+    enum StereoCode format;
+    int width, height;
+    int off_left, off_right;
+    int row_left, row_right;
+} StereoComponent;
+
+static const int ana_coeff[][3][6] = {
+  [ANAGLYPH_RB_GRAY]   =
+    {{19595, 38470,  7471,     0,     0,     0},
+     {    0,     0,     0,     0,     0,     0},
+     {    0,     0,     0, 19595, 38470,  7471}},
+  [ANAGLYPH_RG_GRAY]   =
+    {{19595, 38470,  7471,     0,     0,     0},
+     {    0,     0,     0, 19595, 38470,  7471},
+     {    0,     0,     0,     0,     0,     0}},
+  [ANAGLYPH_RC_GRAY]   =
+    {{19595, 38470,  7471,     0,     0,     0},
+     {    0,     0,     0, 19595, 38470,  7471},
+     {    0,     0,     0, 19595, 38470,  7471}},
+  [ANAGLYPH_RC_HALF]   =
+    {{19595, 38470,  7471,     0,     0,     0},
+     {    0,     0,     0,     0, 65536,     0},
+     {    0,     0,     0,     0,     0, 65536}},
+  [ANAGLYPH_RC_COLOR]  =
+    {{65536,     0,     0,     0,     0,     0},
+     {    0,     0,     0,     0, 65536,     0},
+     {    0,     0,     0,     0,     0, 65536}},
+  [ANAGLYPH_RC_DUBOIS] =
+    {{29891, 32800, 11559, -2849, -5763,  -102},
+     {-2627, -2479, -1033, 24804, 48080, -1209},
+     { -997, -1350,  -358, -4729, -7403, 80373}},
+  [ANAGLYPH_GM_GRAY]   =
+    {{    0,     0,     0, 19595, 38470,  7471},
+     {19595, 38470,  7471,     0,     0,     0},
+     {    0,     0,     0, 19595, 38470,  7471}},
+  [ANAGLYPH_GM_HALF]   =
+    {{    0,     0,     0, 65536,     0,     0},
+     {19595, 38470,  7471,     0,     0,     0},
+     {    0,     0,     0,     0,     0, 65536}},
+  [ANAGLYPH_GM_COLOR]  =
+    {{    0,     0,     0, 65536,     0,     0},
+     {    0, 65536,     0,     0,     0,     0},
+     {    0,     0,     0,     0,     0, 65536}},
+  [ANAGLYPH_GM_DUBOIS]  =
+    {{-4063,-10354, -2556, 34669, 46203,  1573},
+     {18612, 43778,  9372, -1049,  -983, -4260},
+     { -983, -1769,  1376,   590,  4915, 61407}},
+  [ANAGLYPH_YB_GRAY]   =
+    {{    0,     0,     0, 19595, 38470,  7471},
+     {    0,     0,     0, 19595, 38470,  7471},
+     {19595, 38470,  7471,     0,     0,     0}},
+  [ANAGLYPH_YB_HALF]   =
+    {{    0,     0,     0, 65536,     0,     0},
+     {    0,     0,     0,     0, 65536,     0},
+     {19595, 38470,  7471,     0,     0,     0}},
+  [ANAGLYPH_YB_COLOR]  =
+    {{    0,     0,     0, 65536,     0,     0},
+     {    0,     0,     0,     0, 65536,     0},
+     {    0,     0, 65536,     0,     0,     0}},
+  [ANAGLYPH_YB_DUBOIS] =
+    {{65535,-12650,18451,   -987, -7590, -1049},
+     {-1604, 56032, 4196,    370,  3826, -1049},
+     {-2345,-10676, 1358,   5801, 11416, 56217}},
+};
+
+typedef struct Stereo3DContext {
+    const AVClass *class;
+    StereoComponent in, out;
+    int width, height;
+    int row_step;
+    int ana_matrix[3][6];
+} Stereo3DContext;
+
+#define OFFSET(x) offsetof(Stereo3DContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption stereo3d_options[] = {
+    { "in",    "set input format",  OFFSET(in.format),  AV_OPT_TYPE_INT, {.i64=SIDE_BY_SIDE_LR}, SIDE_BY_SIDE_LR, ABOVE_BELOW_2_RL, FLAGS, "in"},
+    { "ab2l",  "above below half height left first",  0, AV_OPT_TYPE_CONST, {.i64=ABOVE_BELOW_2_LR},  0, 0, FLAGS, "in" },
+    { "ab2r",  "above below half height right first", 0, AV_OPT_TYPE_CONST, {.i64=ABOVE_BELOW_2_RL},  0, 0, FLAGS, "in" },
+    { "abl",   "above below left first",              0, AV_OPT_TYPE_CONST, {.i64=ABOVE_BELOW_LR},    0, 0, FLAGS, "in" },
+    { "abr",   "above below right first",             0, AV_OPT_TYPE_CONST, {.i64=ABOVE_BELOW_RL},    0, 0, FLAGS, "in" },
+    { "sbs2l", "side by side half width left first",  0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_2_LR}, 0, 0, FLAGS, "in" },
+    { "sbs2r", "side by side half width right first", 0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_2_RL}, 0, 0, FLAGS, "in" },
+    { "sbsl",  "side by side left first",             0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_LR},   0, 0, FLAGS, "in" },
+    { "sbsr",  "side by side right first",            0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_RL},   0, 0, FLAGS, "in" },
+    { "out",   "set output format", OFFSET(out.format), AV_OPT_TYPE_INT, {.i64=ANAGLYPH_RC_DUBOIS}, 0, STEREO_CODE_COUNT-1, FLAGS, "out"},
+    { "ab2l",  "above below half height left first",  0, AV_OPT_TYPE_CONST, {.i64=ABOVE_BELOW_2_LR},   0, 0, FLAGS, "out" },
+    { "ab2r",  "above below half height right first", 0, AV_OPT_TYPE_CONST, {.i64=ABOVE_BELOW_2_RL},   0, 0, FLAGS, "out" },
+    { "abl",   "above below left first",              0, AV_OPT_TYPE_CONST, {.i64=ABOVE_BELOW_LR},     0, 0, FLAGS, "out" },
+    { "abr",   "above below right first",             0, AV_OPT_TYPE_CONST, {.i64=ABOVE_BELOW_RL},     0, 0, FLAGS, "out" },
+    { "agmc",  "anaglyph green magenta color",        0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_GM_COLOR},  0, 0, FLAGS, "out" },
+    { "agmd",  "anaglyph green magenta dubois",       0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_GM_DUBOIS}, 0, 0, FLAGS, "out" },
+    { "agmg",  "anaglyph green magenta gray",         0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_GM_GRAY},   0, 0, FLAGS, "out" },
+    { "agmh",  "anaglyph green magenta half color",   0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_GM_HALF},   0, 0, FLAGS, "out" },
+    { "arbg",  "anaglyph red blue gray",              0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_RB_GRAY},   0, 0, FLAGS, "out" },
+    { "arcc",  "anaglyph red cyan color",             0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_RC_COLOR},  0, 0, FLAGS, "out" },
+    { "arcd",  "anaglyph red cyan dubois",            0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_RC_DUBOIS}, 0, 0, FLAGS, "out" },
+    { "arcg",  "anaglyph red cyan gray",              0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_RC_GRAY},   0, 0, FLAGS, "out" },
+    { "arch",  "anaglyph red cyan half color",        0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_RC_HALF},   0, 0, FLAGS, "out" },
+    { "argg",  "anaglyph red green gray",             0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_RG_GRAY},   0, 0, FLAGS, "out" },
+    { "aybc",  "anaglyph yellow blue color",          0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_YB_COLOR},  0, 0, FLAGS, "out" },
+    { "aybd",  "anaglyph yellow blue dubois",         0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_YB_DUBOIS}, 0, 0, FLAGS, "out" },
+    { "aybg",  "anaglyph yellow blue gray",           0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_YB_GRAY},   0, 0, FLAGS, "out" },
+    { "aybh",  "anaglyph yellow blue half color",     0, AV_OPT_TYPE_CONST, {.i64=ANAGLYPH_YB_HALF},   0, 0, FLAGS, "out" },
+    { "irl",   "interleave rows left first",          0, AV_OPT_TYPE_CONST, {.i64=INTERLEAVE_ROWS_LR}, 0, 0, FLAGS, "out" },
+    { "irr",   "interleave rows right first",         0, AV_OPT_TYPE_CONST, {.i64=INTERLEAVE_ROWS_RL}, 0, 0, FLAGS, "out" },
+    { "ml",    "mono left",                           0, AV_OPT_TYPE_CONST, {.i64=MONO_L},             0, 0, FLAGS, "out" },
+    { "mr",    "mono right",                          0, AV_OPT_TYPE_CONST, {.i64=MONO_R},             0, 0, FLAGS, "out" },
+    { "sbs2l", "side by side half width left first",  0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_2_LR},  0, 0, FLAGS, "out" },
+    { "sbs2r", "side by side half width right first", 0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_2_RL},  0, 0, FLAGS, "out" },
+    { "sbsl",  "side by side left first",             0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_LR},    0, 0, FLAGS, "out" },
+    { "sbsr",  "side by side right first",            0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_RL},    0, 0, FLAGS, "out" },
+};
+
+AVFILTER_DEFINE_CLASS(stereo3d);
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+    Stereo3DContext *s = ctx->priv;
+    static const char *shorthand[] = { "in", "out", NULL };
+    int ret;
+
+    s->class = &stereo3d_class;
+    av_opt_set_defaults(s);
+
+    if ((ret = av_opt_set_from_string(s, args, shorthand, "=", ":")) < 0)
+        return ret;
+
+    return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE
+    };
+
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    AVFilterLink *inlink = ctx->inputs[0];
+    Stereo3DContext *s = ctx->priv;
+    AVRational aspect = inlink->sample_aspect_ratio;
+
+    s->in.width     =
+    s->width        = inlink->w;
+    s->in.height    =
+    s->height       = inlink->h;
+    s->row_step     = 1;
+    s->in.off_left  =
+    s->in.off_right =
+    s->in.row_left  =
+    s->in.row_right = 0;
+
+    switch (s->in.format) {
+    case SIDE_BY_SIDE_2_LR:
+        aspect.num     *= 2;
+    case SIDE_BY_SIDE_LR:
+        s->width        = inlink->w / 2;
+        s->in.off_right = s->width * 3;
+        break;
+    case SIDE_BY_SIDE_2_RL:
+        aspect.num     *= 2;
+    case SIDE_BY_SIDE_RL:
+        s->width        = inlink->w / 2;
+        s->in.off_left  = s->width * 3;
+        break;
+    case ABOVE_BELOW_2_LR:
+        aspect.den     *= 2;
+    case ABOVE_BELOW_LR:
+        s->in.row_right =
+        s->height       = inlink->h / 2;
+        break;
+    case ABOVE_BELOW_2_RL:
+        aspect.den     *= 2;
+    case ABOVE_BELOW_RL:
+        s->in.row_left  =
+        s->height       = inlink->h / 2;
+        break;
+    default:
+        av_log(ctx, AV_LOG_ERROR, "input format %d is not supported\n", s->in.format);
+        return AVERROR(EINVAL);
+    }
+
+    s->out.width     = s->width;
+    s->out.height    = s->height;
+    s->out.off_left  =
+    s->out.off_right =
+    s->out.row_left  =
+    s->out.row_right = 0;
+
+    switch (s->out.format) {
+    case ANAGLYPH_RB_GRAY:
+    case ANAGLYPH_RG_GRAY:
+    case ANAGLYPH_RC_GRAY:
+    case ANAGLYPH_RC_HALF:
+    case ANAGLYPH_RC_COLOR:
+    case ANAGLYPH_RC_DUBOIS:
+    case ANAGLYPH_GM_GRAY:
+    case ANAGLYPH_GM_HALF:
+    case ANAGLYPH_GM_COLOR:
+    case ANAGLYPH_GM_DUBOIS:
+    case ANAGLYPH_YB_GRAY:
+    case ANAGLYPH_YB_HALF:
+    case ANAGLYPH_YB_COLOR:
+    case ANAGLYPH_YB_DUBOIS:
+        memcpy(s->ana_matrix, ana_coeff[s->out.format], sizeof(s->ana_matrix));
+        break;
+    case SIDE_BY_SIDE_2_LR:
+        aspect.num      /= 2;
+    case SIDE_BY_SIDE_LR:
+        s->out.width     =
+        s->out.off_right = s->width * 3;
+        break;
+    case SIDE_BY_SIDE_2_RL:
+        aspect.num      /= 2;
+    case SIDE_BY_SIDE_RL:
+        s->out.width     = s->width * 2;
+        s->out.off_left  = s->width * 3;
+        break;
+    case ABOVE_BELOW_2_LR:
+        aspect.den      /= 2;
+    case ABOVE_BELOW_LR:
+        s->out.height    = s->height * 2;
+        s->out.row_right = s->height;
+        break;
+    case ABOVE_BELOW_2_RL:
+        aspect.den      /= 2;
+    case ABOVE_BELOW_RL:
+        s->out.height    = s->height * 2;
+        s->out.row_left  = s->height;
+        break;
+    case INTERLEAVE_ROWS_LR:
+        s->row_step      = 2;
+        s->height        = s->height / 2;
+        s->out.off_right = s->width * 3;
+        s->in.off_right += s->in.width * 3;
+        break;
+    case INTERLEAVE_ROWS_RL:
+        s->row_step      = 2;
+        s->height        = s->height / 2;
+        s->out.off_left  = s->width * 3;
+        s->in.off_left  += s->in.width * 3;
+        break;
+    case MONO_R:
+        s->in.off_left   = s->in.off_right;
+        s->in.row_left   = s->in.row_right;
+    case MONO_L:
+        break;
+    default:
+        av_log(ctx, AV_LOG_ERROR, "output format is not supported\n");
+        return AVERROR(EINVAL);
+    }
+
+    outlink->w = s->out.width;
+    outlink->h = s->out.height;
+    outlink->sample_aspect_ratio = aspect;
+
+    return 0;
+}
+
+static inline uint8_t ana_convert(const int *coeff, uint8_t *left, uint8_t *right)
+{
+    int sum;
+
+    sum  = coeff[0] * left[0] + coeff[3] * right[0]; //red in
+    sum += coeff[1] * left[1] + coeff[4] * right[1]; //green in
+    sum += coeff[2] * left[2] + coeff[5] * right[2]; //blue in
+
+    return av_clip_uint8(sum >> 16);
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+{
+    AVFilterContext *ctx  = inlink->dst;
+    Stereo3DContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AVFilterBufferRef *out;
+    int out_off_left, out_off_right;
+    int in_off_left, in_off_right;
+    int ret;
+
+    out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+    if (!out) {
+        avfilter_unref_bufferp(&inpicref);
+        return AVERROR(ENOMEM);
+    }
+
+    out->pts = inpicref->pts;
+    out->pos = inpicref->pos;
+
+    in_off_left   = s->in.row_left  * inpicref->linesize[0] + s->in.off_left;
+    in_off_right  = s->in.row_right * inpicref->linesize[0] + s->in.off_right;
+    out_off_left  = s->out.row_left  * out->linesize[0] + s->out.off_left;
+    out_off_right = s->out.row_right * out->linesize[0] + s->out.off_right;
+
+    switch (s->out.format) {
+    case SIDE_BY_SIDE_LR:
+    case SIDE_BY_SIDE_RL:
+    case SIDE_BY_SIDE_2_LR:
+    case SIDE_BY_SIDE_2_RL:
+    case ABOVE_BELOW_LR:
+    case ABOVE_BELOW_RL:
+    case ABOVE_BELOW_2_LR:
+    case ABOVE_BELOW_2_RL:
+    case INTERLEAVE_ROWS_LR:
+    case INTERLEAVE_ROWS_RL:
+        av_image_copy_plane(out->data[0] + out_off_left,
+                            out->linesize[0] * s->row_step,
+                            inpicref->data[0] + in_off_left,
+                            inpicref->linesize[0] * s->row_step,
+                            3 * s->width, s->height);
+        av_image_copy_plane(out->data[0] + out_off_right,
+                            out->linesize[0] * s->row_step,
+                            inpicref->data[0] + in_off_right,
+                            inpicref->linesize[0] * s->row_step,
+                            3 * s->width, s->height);
+        break;
+    case MONO_L:
+    case MONO_R:
+        av_image_copy_plane(out->data[0], out->linesize[0],
+                            inpicref->data[0] + in_off_left,
+                            inpicref->linesize[0],
+                            3 * s->width, s->height);
+        break;
+    case ANAGLYPH_RB_GRAY:
+    case ANAGLYPH_RG_GRAY:
+    case ANAGLYPH_RC_GRAY:
+    case ANAGLYPH_RC_HALF:
+    case ANAGLYPH_RC_COLOR:
+    case ANAGLYPH_RC_DUBOIS:
+    case ANAGLYPH_GM_GRAY:
+    case ANAGLYPH_GM_HALF:
+    case ANAGLYPH_GM_COLOR:
+    case ANAGLYPH_GM_DUBOIS:
+    case ANAGLYPH_YB_GRAY:
+    case ANAGLYPH_YB_HALF:
+    case ANAGLYPH_YB_COLOR:
+    case ANAGLYPH_YB_DUBOIS: {
+        int i, x, y, il, ir, o;
+        uint8_t *src = inpicref->data[0];
+        uint8_t *dst = out->data[0];
+        int out_width = s->out.width;
+        int *ana_matrix[3];
+
+        for (i = 0; i < 3; i++)
+            ana_matrix[i] = s->ana_matrix[i];
+
+        for (y = 0; y < s->out.height; y++) {
+            o   = out->linesize[0] * y;
+            il  = in_off_left  + y * inpicref->linesize[0];
+            ir  = in_off_right + y * inpicref->linesize[0];
+            for (x = 0; x < out_width; x++, il += 3, ir += 3, o+= 3) {
+                dst[o    ] = ana_convert(ana_matrix[0], src + il, src + ir);
+                dst[o + 1] = ana_convert(ana_matrix[1], src + il, src + ir);
+                dst[o + 2] = ana_convert(ana_matrix[2], src + il, src + ir);
+            }
+        }
+        break;
+    }
+    default:
+        av_assert0(0);
+    }
+
+    ret = ff_filter_frame(outlink, out);
+    avfilter_unref_bufferp(&inpicref);
+    if (ret < 0)
+        return ret;
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    Stereo3DContext *s = ctx->priv;
+
+    av_opt_free(s);
+}
+
+static const AVFilterPad stereo3d_inputs[] = {
+    {
+        .name             = "default",
+        .type             = AVMEDIA_TYPE_VIDEO,
+        .get_video_buffer = ff_null_get_video_buffer,
+        .filter_frame     = filter_frame,
+        .min_perms        = AV_PERM_READ,
+    },
+    { NULL }
+};
+
+static const AVFilterPad stereo3d_outputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = config_output,
+        .min_perms    = AV_PERM_WRITE,
+    },
+    { NULL }
+};
+
+AVFilter avfilter_vf_stereo3d = {
+    .name          = "stereo3d",
+    .description   = NULL_IF_CONFIG_SMALL("Convert video stereoscopic 3D view."),
+    .priv_size     = sizeof(Stereo3DContext),
+    .init          = init,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = stereo3d_inputs,
+    .outputs       = stereo3d_outputs,
+    .priv_class    = &stereo3d_class,
+};