@@ -52,6 +52,7 @@ version <next>:

 - Escape 130 video decoder

 - FTP protocol support

 - V4L2 output device

+- 3D LUT filter (lut3d)

 version 1.2:

@@ -4596,6 +4596,42 @@ kerndeint=map=1

 @end example

 @end itemize

+@section lut3d

+

+Apply a 3D LUT to an input video.

+

+The filter accepts the following options:

+

+@table @option

+@item file

+Set the 3D LUT file name.

+

+Currently supported formats:

+@table @samp

+@item 3dl

+AfterEffects

+@item cube

+Iridas

+@item dat

+DaVinci

+@item m3d

+Pandora

+@end table

+@item interp

+Select interpolation mode.

+

+Available values are:

+

+@table @samp

+@item nearest

+Use values from the nearest defined point.

+@item trilinear

+Interpolate values using the 8 points defining a cube.

+@item tetrahedral

+Interpolate values using a tetrahedron.

+@end table

+@end table

+

 @section lut, lutrgb, lutyuv

 Compute a look-up table for binding each pixel component input value

@@ -145,6 +145,7 @@ OBJS-$(CONFIG_IL_FILTER)                     += vf_il.o

 OBJS-$(CONFIG_INTERLACE_FILTER)              += vf_interlace.o

 OBJS-$(CONFIG_INTERLEAVE_FILTER)             += f_interleave.o

 OBJS-$(CONFIG_KERNDEINT_FILTER)              += vf_kerndeint.o

+OBJS-$(CONFIG_LUT3D_FILTER)                  += vf_lut3d.o

 OBJS-$(CONFIG_LUT_FILTER)                    += vf_lut.o

 OBJS-$(CONFIG_LUTRGB_FILTER)                 += vf_lut.o

 OBJS-$(CONFIG_LUTYUV_FILTER)                 += vf_lut.o

@@ -143,6 +143,7 @@ void avfilter_register_all(void)

     REGISTER_FILTER(INTERLACE,      interlace,      vf);

     REGISTER_FILTER(INTERLEAVE,     interleave,     vf);

     REGISTER_FILTER(KERNDEINT,      kerndeint,      vf);

+    REGISTER_FILTER(LUT3D,          lut3d,          vf);

     REGISTER_FILTER(LUT,            lut,            vf);

     REGISTER_FILTER(LUTRGB,         lutrgb,         vf);

     REGISTER_FILTER(LUTYUV,         lutyuv,         vf);

@@ -30,8 +30,8 @@

 #include "libavutil/avutil.h"

 #define LIBAVFILTER_VERSION_MAJOR  3

-#define LIBAVFILTER_VERSION_MINOR  68

-#define LIBAVFILTER_VERSION_MICRO 103

+#define LIBAVFILTER_VERSION_MINOR  69

+#define LIBAVFILTER_VERSION_MICRO 100

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

                                                LIBAVFILTER_VERSION_MINOR, \

new file mode 100644

@@ -0,0 +1,578 @@

+/*

+ * Copyright (c) 2013 Clément Bœsch

+ *

+ * 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

+ * 3D Lookup table filter

+ */

+

+#include "libavutil/opt.h"

+#include "libavutil/file.h"

+#include "libavutil/intreadwrite.h"

+#include "libavutil/avassert.h"

+#include "libavutil/pixdesc.h"

+#include "libavutil/avstring.h"

+#include "avfilter.h"

+#include "drawutils.h"

+#include "formats.h"

+#include "internal.h"

+#include "video.h"

+

+#define R 0

+#define G 1

+#define B 2

+#define A 3

+

+enum interp_mode {

+    INTERPOLATE_NEAREST,

+    INTERPOLATE_TRILINEAR,

+    INTERPOLATE_TETRAHEDRAL,

+    NB_INTERP_MODE

+};

+

+struct rgbvec {

+    float r, g, b;

+};

+

+#define MAX_LEVEL 36

+

+typedef struct LUT3DContext {

+    const AVClass *class;

+    enum interp_mode interpolation;

+    char *file;

+    uint8_t rgba_map[4];

+    int step;

+    int is16bit;

+    struct rgbvec (*interp_8) (const struct LUT3DContext*, uint8_t,  uint8_t,  uint8_t);

+    struct rgbvec (*interp_16)(const struct LUT3DContext*, uint16_t, uint16_t, uint16_t);

+    struct rgbvec lut[MAX_LEVEL][MAX_LEVEL][MAX_LEVEL];

+    int lutsize;

+} LUT3DContext;

+

+#define OFFSET(x) offsetof(LUT3DContext, x)

+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

+static const AVOption lut3d_options[] = {

+    { "file",   "set 3D LUT file name", OFFSET(file), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

+    { "interp", "select interpolation mode", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=INTERPOLATE_TETRAHEDRAL}, 0, NB_INTERP_MODE-1, FLAGS, "interp_mode" },

+        { "nearest",     "use values from the nearest defined points",            0, AV_OPT_TYPE_CONST, {.i64=INTERPOLATE_NEAREST},     INT_MIN, INT_MAX, FLAGS, "interp_mode" },

+        { "trilinear",   "interpolate values using the 8 points defining a cube", 0, AV_OPT_TYPE_CONST, {.i64=INTERPOLATE_TRILINEAR},   INT_MIN, INT_MAX, FLAGS, "interp_mode" },

+        { "tetrahedral", "interpolate values using a tetrahedron",                0, AV_OPT_TYPE_CONST, {.i64=INTERPOLATE_TETRAHEDRAL}, INT_MIN, INT_MAX, FLAGS, "interp_mode" },

+    { NULL }

+};

+

+AVFILTER_DEFINE_CLASS(lut3d);

+

+static inline float lerpf(float v0, float v1, float f)

+{

+    return v0 + (v1 - v0) * f;

+}

+

+static inline struct rgbvec lerp(const struct rgbvec *v0, const struct rgbvec *v1, float f)

+{

+    struct rgbvec v = {

+        lerpf(v0->r, v1->r, f), lerpf(v0->g, v1->g, f), lerpf(v0->b, v1->b, f)

+    };

+    return v;

+}

+

+#define NEAR(x) ((int)((x) + .5))

+#define PREV(x) ((int)(x))

+#define NEXT(x) ((int)(x) + 1)

+

+/**

+ * Get the nearest defined point

+ */

+static inline struct rgbvec interp_nearest(const LUT3DContext *lut3d,

+                                           const struct rgbvec *s)

+{

+    return lut3d->lut[NEAR(s->r)][NEAR(s->g)][NEAR(s->b)];

+}

+

+/**

+ * Interpolate using the 8 vertices of a cube

+ * @see https://en.wikipedia.org/wiki/Trilinear_interpolation

+ */

+static inline struct rgbvec interp_trilinear(const LUT3DContext *lut3d,

+                                             const struct rgbvec *s)

+{

+    const struct rgbvec d = {s->r - PREV(s->r), s->g - PREV(s->g), s->b - PREV(s->b)};

+    const struct rgbvec c000 = lut3d->lut[PREV(s->r)][PREV(s->g)][PREV(s->b)];

+    const struct rgbvec c001 = lut3d->lut[PREV(s->r)][PREV(s->g)][NEXT(s->b)];

+    const struct rgbvec c010 = lut3d->lut[PREV(s->r)][NEXT(s->g)][PREV(s->b)];

+    const struct rgbvec c011 = lut3d->lut[PREV(s->r)][NEXT(s->g)][NEXT(s->b)];

+    const struct rgbvec c100 = lut3d->lut[NEXT(s->r)][PREV(s->g)][PREV(s->b)];

+    const struct rgbvec c101 = lut3d->lut[NEXT(s->r)][PREV(s->g)][NEXT(s->b)];

+    const struct rgbvec c110 = lut3d->lut[NEXT(s->r)][NEXT(s->g)][PREV(s->b)];

+    const struct rgbvec c111 = lut3d->lut[NEXT(s->r)][NEXT(s->g)][NEXT(s->b)];

+    const struct rgbvec c00  = lerp(&c000, &c100, d.r);

+    const struct rgbvec c10  = lerp(&c010, &c110, d.r);

+    const struct rgbvec c01  = lerp(&c001, &c101, d.r);

+    const struct rgbvec c11  = lerp(&c011, &c111, d.r);

+    const struct rgbvec c0   = lerp(&c00,  &c10,  d.g);

+    const struct rgbvec c1   = lerp(&c01,  &c11,  d.g);

+    const struct rgbvec c    = lerp(&c0,   &c1,   d.b);

+    return c;

+}

+

+/**

+ * Tetrahedral interpolation. Based on code found in Truelight Software Library paper.

+ * @see http://www.filmlight.ltd.uk/pdf/whitepapers/FL-TL-TN-0057-SoftwareLib.pdf

+ */

+static inline struct rgbvec interp_tetrahedral(const LUT3DContext *lut3d,

+                                               const struct rgbvec *s)

+{

+    const struct rgbvec d = {s->r - PREV(s->r), s->g - PREV(s->g), s->b - PREV(s->b)};

+    const struct rgbvec c000 = lut3d->lut[PREV(s->r)][PREV(s->g)][PREV(s->b)];

+    const struct rgbvec c001 = lut3d->lut[PREV(s->r)][PREV(s->g)][NEXT(s->b)];

+    const struct rgbvec c010 = lut3d->lut[PREV(s->r)][NEXT(s->g)][PREV(s->b)];

+    const struct rgbvec c011 = lut3d->lut[PREV(s->r)][NEXT(s->g)][NEXT(s->b)];

+    const struct rgbvec c100 = lut3d->lut[NEXT(s->r)][PREV(s->g)][PREV(s->b)];

+    const struct rgbvec c101 = lut3d->lut[NEXT(s->r)][PREV(s->g)][NEXT(s->b)];

+    const struct rgbvec c110 = lut3d->lut[NEXT(s->r)][NEXT(s->g)][PREV(s->b)];

+    const struct rgbvec c111 = lut3d->lut[NEXT(s->r)][NEXT(s->g)][NEXT(s->b)];

+    struct rgbvec c;

+    if (d.r > d.g) {

+        if (d.g > d.b) {

+            c.r = (1-d.r) * c000.r + (d.r-d.g) * c100.r + (d.g-d.b) * c110.r + (d.b) * c111.r;

+            c.g = (1-d.r) * c000.g + (d.r-d.g) * c100.g + (d.g-d.b) * c110.g + (d.b) * c111.g;

+            c.b = (1-d.r) * c000.b + (d.r-d.g) * c100.b + (d.g-d.b) * c110.b + (d.b) * c111.b;

+        } else if (d.r > d.b) {

+            c.r = (1-d.r) * c000.r + (d.r-d.b) * c100.r + (d.b-d.g) * c101.r + (d.g) * c111.r;

+            c.g = (1-d.r) * c000.g + (d.r-d.b) * c100.g + (d.b-d.g) * c101.g + (d.g) * c111.g;

+            c.b = (1-d.r) * c000.b + (d.r-d.b) * c100.b + (d.b-d.g) * c101.b + (d.g) * c111.b;

+        } else {

+            c.r = (1-d.b) * c000.r + (d.b-d.r) * c001.r + (d.r-d.g) * c101.r + (d.g) * c111.r;

+            c.g = (1-d.b) * c000.g + (d.b-d.r) * c001.g + (d.r-d.g) * c101.g + (d.g) * c111.g;

+            c.b = (1-d.b) * c000.b + (d.b-d.r) * c001.b + (d.r-d.g) * c101.b + (d.g) * c111.b;

+        }

+    } else {

+        if (d.b > d.g) {

+            c.r = (1-d.b) * c000.r + (d.b-d.g) * c001.r + (d.g-d.r) * c011.r + (d.r) * c111.r;

+            c.g = (1-d.b) * c000.g + (d.b-d.g) * c001.g + (d.g-d.r) * c011.g + (d.r) * c111.g;

+            c.b = (1-d.b) * c000.b + (d.b-d.g) * c001.b + (d.g-d.r) * c011.b + (d.r) * c111.b;

+        } else if (d.b > d.r) {

+            c.r = (1-d.g) * c000.r + (d.g-d.b) * c010.r + (d.b-d.r) * c011.r + (d.r) * c111.r;

+            c.g = (1-d.g) * c000.g + (d.g-d.b) * c010.g + (d.b-d.r) * c011.g + (d.r) * c111.g;

+            c.b = (1-d.g) * c000.b + (d.g-d.b) * c010.b + (d.b-d.r) * c011.b + (d.r) * c111.b;

+        } else {

+            c.r = (1-d.g) * c000.r + (d.g-d.r) * c010.r + (d.r-d.b) * c110.r + (d.b) * c111.r;

+            c.g = (1-d.g) * c000.g + (d.g-d.r) * c010.g + (d.r-d.b) * c110.g + (d.b) * c111.g;

+            c.b = (1-d.g) * c000.b + (d.g-d.r) * c010.b + (d.r-d.b) * c110.b + (d.b) * c111.b;

+        }

+    }

+    return c;

+}

+

+#define DEFINE_INTERP_FUNC(name, nbits)                                     \

+static struct rgbvec interp_##nbits##_##name(const LUT3DContext *lut3d,     \

+                                             uint##nbits##_t r,             \

+                                             uint##nbits##_t g,             \

+                                             uint##nbits##_t b)             \

+{                                                                           \

+    const float scale = (1. / ((1<<nbits) - 1)) * (lut3d->lutsize - 1);     \

+    const struct rgbvec scaled_rgb = {r * scale, g * scale, b * scale};     \

+    return interp_##name(lut3d, &scaled_rgb);                               \

+}

+

+DEFINE_INTERP_FUNC(nearest,     8)

+DEFINE_INTERP_FUNC(trilinear,   8)

+DEFINE_INTERP_FUNC(tetrahedral, 8)

+

+DEFINE_INTERP_FUNC(nearest,     16)

+DEFINE_INTERP_FUNC(trilinear,   16)

+DEFINE_INTERP_FUNC(tetrahedral, 16)

+

+#define MAX_LINE_SIZE 512

+

+static int skip_line(const char *p)

+{

+    while (*p && av_isspace(*p))

+        p++;

+    return !*p || *p == '#';

+}

+

+#define NEXT_LINE(loop_cond) do {                           \

+    if (!fgets(line, sizeof(line), f)) {                    \

+        av_log(ctx, AV_LOG_ERROR, "Unexpected EOF\n");      \

+        return AVERROR_INVALIDDATA;                         \

+    }                                                       \

+} while (loop_cond)

+

+/* Basically r g and b float values on each line; seems to be generated by

+ * Davinci */

+static int parse_dat(AVFilterContext *ctx, FILE *f)

+{

+    LUT3DContext *lut3d = ctx->priv;

+    const int size = lut3d->lutsize;

+    int i, j, k;

+

+    for (k = 0; k < size; k++) {

+        for (j = 0; j < size; j++) {

+            for (i = 0; i < size; i++) {

+                char line[MAX_LINE_SIZE];

+                struct rgbvec *vec = &lut3d->lut[k][j][i];

+                NEXT_LINE(skip_line(line));

+                sscanf(line, "%f %f %f", &vec->r, &vec->g, &vec->b);

+            }

+        }

+    }

+    return 0;

+}

+

+/* Iridas format */

+static int parse_cube(AVFilterContext *ctx, FILE *f)

+{

+    LUT3DContext *lut3d = ctx->priv;

+    char line[MAX_LINE_SIZE];

+    float min[3] = {0.0, 0.0, 0.0};

+    float max[3] = {1.0, 1.0, 1.0};

+

+    while (fgets(line, sizeof(line), f)) {

+        if (!strncmp(line, "LUT_3D_SIZE ", 12)) {

+            int i, j, k;

+            const int size = strtol(line + 12, NULL, 0);

+

+            if (size > MAX_LEVEL) {

+                av_log(ctx, AV_LOG_ERROR, "Too large 3D LUT\n");

+                return AVERROR(EINVAL);

+            }

+            lut3d->lutsize = size;

+            for (k = 0; k < size; k++) {

+                for (j = 0; j < size; j++) {

+                    for (i = 0; i < size; i++) {

+                        struct rgbvec *vec = &lut3d->lut[k][j][i];

+

+                        do {

+                            NEXT_LINE(0);

+                            if (!strncmp(line, "DOMAIN_", 7)) {

+                                float *vals = NULL;

+                                if      (!strncmp(line + 7, "MIN ", 4)) vals = min;

+                                else if (!strncmp(line + 7, "MAX ", 4)) vals = max;

+                                if (!vals)

+                                    return AVERROR_INVALIDDATA;

+                                sscanf(line + 11, "%f %f %f", vals, vals + 1, vals + 2);

+                                av_log(ctx, AV_LOG_DEBUG, "min: %f %f %f | max: %f %f %f\n",

+                                       min[0], min[1], min[2], max[0], max[1], max[2]);

+                                continue;

+                            }

+                        } while (skip_line(line));

+                        if (sscanf(line, "%f %f %f", &vec->r, &vec->g, &vec->b) != 3)

+                            return AVERROR_INVALIDDATA;

+                        vec->r *= max[0] - min[0];

+                        vec->g *= max[1] - min[1];

+                        vec->b *= max[2] - min[2];

+                    }

+                }

+            }

+            break;

+        }

+    }

+    return 0;

+}

+

+/* Assume 17x17x17 LUT with a 16-bit depth

+ * FIXME: it seems there are various 3dl formats */

+static int parse_3dl(AVFilterContext *ctx, FILE *f)

+{

+    char line[MAX_LINE_SIZE];

+    LUT3DContext *lut3d = ctx->priv;

+    int i, j, k;

+    const int size = 17;

+    const float scale = 16*16*16;

+

+    lut3d->lutsize = size;

+    if (!fgets(line, sizeof(line), f))

+        return AVERROR_INVALIDDATA;

+    for (k = 0; k < size; k++) {

+        for (j = 0; j < size; j++) {

+            for (i = 0; i < size; i++) {

+                int r, g, b;

+                struct rgbvec *vec = &lut3d->lut[k][j][i];

+

+                NEXT_LINE(skip_line(line));

+                if (sscanf(line, "%d %d %d", &r, &g, &b) != 3)

+                    return AVERROR_INVALIDDATA;

+                vec->r = r / scale;

+                vec->g = g / scale;

+                vec->b = b / scale;

+            }

+        }

+    }

+    return 0;

+}

+

+/* Pandora format */

+static int parse_m3d(AVFilterContext *ctx, FILE *f)

+{

+    LUT3DContext *lut3d = ctx->priv;

+    float scale;

+    int i, j, k, size, in = -1, out = -1;

+    char line[MAX_LINE_SIZE];

+    uint8_t rgb_map[3] = {0, 1, 2};

+

+    while (fgets(line, sizeof(line), f)) {

+        if      (!strncmp(line, "in",  2)) in  = strtol(line + 2, NULL, 0);

+        else if (!strncmp(line, "out", 3)) out = strtol(line + 3, NULL, 0);

+        else if (!strncmp(line, "values", 6)) {

+            const char *p = line + 6;

+#define SET_COLOR(id) do {                  \

+    while (av_isspace(*p))                  \

+        p++;                                \

+    switch (*p) {                           \

+    case 'r': rgb_map[id] = 0; break;       \

+    case 'g': rgb_map[id] = 1; break;       \

+    case 'b': rgb_map[id] = 2; break;       \

+    }                                       \

+    while (*p && !av_isspace(*p))           \

+        p++;                                \

+} while (0)

+            SET_COLOR(0);

+            SET_COLOR(1);

+            SET_COLOR(2);

+            break;

+        }

+    }

+

+    if (in == -1 || out == -1) {

+        av_log(ctx, AV_LOG_ERROR, "in and out must be defined\n");

+        return AVERROR_INVALIDDATA;

+    }

+    for (size = 1; size*size*size < in; size++);

+    lut3d->lutsize = size;

+    scale = 1. / (out - 1);

+

+    for (k = 0; k < size; k++) {

+        for (j = 0; j < size; j++) {

+            for (i = 0; i < size; i++) {

+                struct rgbvec *vec = &lut3d->lut[k][j][i];

+                float val[3];

+

+                NEXT_LINE(0);

+                if (sscanf(line, "%f %f %f", val, val + 1, val + 2) != 3)

+                    return AVERROR_INVALIDDATA;

+                vec->r = val[rgb_map[0]] * scale;

+                vec->g = val[rgb_map[1]] * scale;

+                vec->b = val[rgb_map[2]] * scale;

+            }

+        }

+    }

+    return 0;

+}

+

+static void set_identity_matrix(LUT3DContext *lut3d, int size)

+{

+    int i, j, k;

+    const float c = 1. / (size - 1);

+

+    lut3d->lutsize = size;

+    for (k = 0; k < size; k++) {

+        for (j = 0; j < size; j++) {

+            for (i = 0; i < size; i++) {

+                struct rgbvec *vec = &lut3d->lut[k][j][i];

+                vec->r = k * c;

+                vec->g = j * c;

+                vec->b = i * c;

+            }

+        }

+    }

+}

+

+static av_cold int init(AVFilterContext *ctx)

+{

+    int ret;

+    FILE *f;

+    const char *ext;

+    LUT3DContext *lut3d = ctx->priv;

+

+    if (!lut3d->file) {

+        set_identity_matrix(lut3d, 32);

+        return 0;

+    }

+

+    f = fopen(lut3d->file, "r");

+    if (!f) {

+        ret = AVERROR(errno);

+        av_log(ctx, AV_LOG_ERROR, "%s: %s\n", lut3d->file, av_err2str(ret));

+        return ret;

+    }

+

+    ext = strrchr(lut3d->file, '.');

+    if (!ext) {

+        av_log(ctx, AV_LOG_ERROR, "Unable to guess the format from the extension\n");

+        ret = AVERROR_INVALIDDATA;

+        goto end;

+    }

+    ext++;

+

+    if (!av_strcasecmp(ext, "dat")) {

+        lut3d->lutsize = 33;

+        ret = parse_dat(ctx, f);

+    } else if (!av_strcasecmp(ext, "3dl")) {

+        ret = parse_3dl(ctx, f);

+    } else if (!av_strcasecmp(ext, "cube")) {

+        ret = parse_cube(ctx, f);

+    } else if (!av_strcasecmp(ext, "m3d")) {

+        ret = parse_m3d(ctx, f);

+    } else {

+        av_log(ctx, AV_LOG_ERROR, "Unrecognized '.%s' file type\n", ext);

+        ret = AVERROR(EINVAL);

+    }

+

+    if (!ret && !lut3d->lutsize) {

+        av_log(ctx, AV_LOG_ERROR, "3D LUT is empty\n");

+        ret = AVERROR_INVALIDDATA;

+    }

+

+end:

+    fclose(f);

+    return ret;

+}

+

+static int query_formats(AVFilterContext *ctx)

+{

+    static const enum AVPixelFormat pix_fmts[] = {

+        AV_PIX_FMT_RGB24,  AV_PIX_FMT_BGR24,

+        AV_PIX_FMT_RGBA,   AV_PIX_FMT_BGRA,

+        AV_PIX_FMT_ARGB,   AV_PIX_FMT_ABGR,

+        AV_PIX_FMT_0RGB,   AV_PIX_FMT_0BGR,

+        AV_PIX_FMT_RGB0,   AV_PIX_FMT_BGR0,

+        AV_PIX_FMT_RGB48,  AV_PIX_FMT_BGR48,

+        AV_PIX_FMT_RGBA64, AV_PIX_FMT_BGRA64,

+        AV_PIX_FMT_NONE

+    };

+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

+    return 0;

+}

+

+static int config_input(AVFilterLink *inlink)

+{

+    LUT3DContext *lut3d = inlink->dst->priv;

+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

+

+    switch (inlink->format) {

+    case AV_PIX_FMT_RGB48:

+    case AV_PIX_FMT_BGR48:

+    case AV_PIX_FMT_RGBA64:

+    case AV_PIX_FMT_BGRA64:

+        lut3d->is16bit = 1;

+    }

+

+    ff_fill_rgba_map(lut3d->rgba_map, inlink->format);

+    lut3d->step = av_get_padded_bits_per_pixel(desc) >> (3 + lut3d->is16bit);

+

+#define SET_FUNC(name) do {                                     \

+    if (lut3d->is16bit) lut3d->interp_16 = interp_16_##name;    \

+    else                lut3d->interp_8  = interp_8_##name;     \

+} while (0)

+

+    switch (lut3d->interpolation) {

+    case INTERPOLATE_NEAREST:     SET_FUNC(nearest);        break;

+    case INTERPOLATE_TRILINEAR:   SET_FUNC(trilinear);      break;

+    case INTERPOLATE_TETRAHEDRAL: SET_FUNC(tetrahedral);    break;

+    default:

+        av_assert0(0);

+    }

+

+    return 0;

+}

+

+#define FILTER(nbits) do {                                                                          \

+    uint8_t       *dstrow = out->data[0];                                                           \

+    const uint8_t *srcrow = in ->data[0];                                                           \

+                                                                                                    \

+    for (y = 0; y < inlink->h; y++) {                                                               \

+        uint##nbits##_t *dst = (uint##nbits##_t *)dstrow;                                           \

+        const uint##nbits##_t *src = (const uint##nbits##_t *)srcrow;                               \

+        for (x = 0; x < inlink->w * step; x += step) {                                              \

+            struct rgbvec vec = lut3d->interp_##nbits(lut3d, src[x + r], src[x + g], src[x + b]);   \

+            dst[x + r] = av_clip_uint##nbits(vec.r * (float)((1<<nbits) - 1));                      \

+            dst[x + g] = av_clip_uint##nbits(vec.g * (float)((1<<nbits) - 1));                      \

+            dst[x + b] = av_clip_uint##nbits(vec.b * (float)((1<<nbits) - 1));                      \

+            if (!direct && step == 4)                                                               \

+                dst[x + a] = src[x + a];                                                            \

+        }                                                                                           \

+        dstrow += out->linesize[0];                                                                 \

+        srcrow += in ->linesize[0];                                                                 \

+    }                                                                                               \

+} while (0)

+

+static int filter_frame(AVFilterLink *inlink, AVFrame *in)

+{

+    int x, y, direct = 0;

+    AVFilterContext *ctx = inlink->dst;

+    LUT3DContext *lut3d = ctx->priv;

+    AVFilterLink *outlink = inlink->dst->outputs[0];

+    AVFrame *out;

+    const int step = lut3d->step;

+    const uint8_t r = lut3d->rgba_map[R];

+    const uint8_t g = lut3d->rgba_map[G];

+    const uint8_t b = lut3d->rgba_map[B];

+    const uint8_t a = lut3d->rgba_map[A];

+

+    if (av_frame_is_writable(in)) {

+        direct = 1;

+        out = in;

+    } else {

+        out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

+        if (!out) {

+            av_frame_free(&in);

+            return AVERROR(ENOMEM);

+        }

+        av_frame_copy_props(out, in);

+    }

+

+    if (lut3d->is16bit) FILTER(16);

+    else                FILTER(8);

+

+    if (!direct)

+        av_frame_free(&in);

+

+    return ff_filter_frame(outlink, out);

+}

+

+static const AVFilterPad lut3d_inputs[] = {

+    {

+        .name         = "default",

+        .type         = AVMEDIA_TYPE_VIDEO,

+        .filter_frame = filter_frame,

+        .config_props = config_input,

+    },

+    { NULL }

+};

+

+static const AVFilterPad lut3d_outputs[] = {

+     {

+         .name = "default",

+         .type = AVMEDIA_TYPE_VIDEO,

+     },

+     { NULL }

+};

+

+AVFilter avfilter_vf_lut3d = {

+    .name          = "lut3d",

+    .description   = NULL_IF_CONFIG_SMALL("Adjust colors using a 3D LUT."),

+    .priv_size     = sizeof(LUT3DContext),

+    .init          = init,

+    .query_formats = query_formats,

+    .inputs        = lut3d_inputs,

+    .outputs       = lut3d_outputs,

+    .priv_class    = &lut3d_class,

+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

+};