[FFmpeg-devel] [PATCH] lavfi/WIP: add lut3d filter.
Clément Bœsch
ubitux at gmail.com
Fri May 10 18:57:25 CEST 2013
TODO:
- Changelog, minor bump
- add Pandora support
- better 3dl support
---
doc/filters.texi | 25 +++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_lut3d.c | 516 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 543 insertions(+)
create mode 100644 libavfilter/vf_lut3d.c
diff --git a/doc/filters.texi b/doc/filters.texi
index fe38b7f..513d85c 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -4467,6 +4467,31 @@ kerndeint=map=1
@end example
@end itemize
+ at section lut3d
+
+Apply a 3D LUT to an input video.
+
+The filter accepts the following options:
+
+ at table @option
+ at item file
+Set the 3D LUT file name.
+
+ at item interp
+Select interpolation mode.
+
+Available values are:
+
+ at table @samp
+ at item nearest
+Interpolate values between the two nearest defined points.
+ at item trilinear
+Interpolate values using the 8 points defining a cube.
+ at item tetrahedral
+Interpolate values using a tetrahedron.
+ at end table
+ at end table
+
@section lut, lutrgb, lutyuv
Compute a look-up table for binding each pixel component input value
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 73a24dd..000cdfb 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -142,6 +142,7 @@ 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
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index b8f273d..12ba6af 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -140,6 +140,7 @@ 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);
diff --git a/libavfilter/vf_lut3d.c b/libavfilter/vf_lut3d.c
new file mode 100644
index 0000000..19ee501
--- /dev/null
+++ b/libavfilter/vf_lut3d.c
@@ -0,0 +1,516 @@
+/*
+ * 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
+ */
+
+#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;
+};
+
+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[48][48][48];
+ 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", "interpolate values between the two 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 struct rgbvec lerp(struct rgbvec v0, 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 PREV(x) ((int)floorf(s->x))
+#define NEXT(x) ((int)ceilf(s->x))
+
+static struct rgbvec interp_nearest(const LUT3DContext *lut3d,
+ const struct rgbvec *s,
+ const struct rgbvec *f)
+{
+ const struct rgbvec *prev = &lut3d->lut[PREV(r)][PREV(g)][PREV(b)];
+ const struct rgbvec *next = &lut3d->lut[NEXT(r)][NEXT(g)][NEXT(b)];
+ struct rgbvec c = {
+ lerpf(prev->r, next->r, f->r),
+ lerpf(prev->g, next->g, f->g),
+ lerpf(prev->b, next->b, f->b),
+ };
+ return c;
+}
+
+static struct rgbvec interp_trilinear(const LUT3DContext *lut3d,
+ const struct rgbvec *s,
+ const struct rgbvec *f)
+{
+ const int prev[3] = {PREV(r), PREV(g), PREV(b)};
+ const int next[3] = {NEXT(r), NEXT(g), NEXT(b)};
+ const struct rgbvec c000 = lut3d->lut[prev[0]][prev[1]][prev[2]];
+ const struct rgbvec c001 = lut3d->lut[prev[0]][prev[1]][next[2]];
+ const struct rgbvec c010 = lut3d->lut[prev[0]][next[1]][prev[2]];
+ const struct rgbvec c011 = lut3d->lut[prev[0]][next[1]][next[2]];
+ const struct rgbvec c100 = lut3d->lut[next[0]][prev[1]][prev[2]];
+ const struct rgbvec c101 = lut3d->lut[next[0]][prev[1]][next[2]];
+ const struct rgbvec c110 = lut3d->lut[next[0]][next[1]][prev[2]];
+ const struct rgbvec c111 = lut3d->lut[next[0]][next[1]][next[2]];
+ const struct rgbvec c00 = lerp(c000, c100, f->r);
+ const struct rgbvec c10 = lerp(c010, c110, f->r);
+ const struct rgbvec c01 = lerp(c001, c101, f->r);
+ const struct rgbvec c11 = lerp(c011, c111, f->r);
+ const struct rgbvec c0 = lerp(c00, c10, f->g);
+ const struct rgbvec c1 = lerp(c01, c11, f->g);
+ const struct rgbvec c = lerp(c0, c1, f->b);
+ return c;
+}
+
+static struct rgbvec interp_tetrahedral(const LUT3DContext *lut3d,
+ const struct rgbvec *s,
+ const struct rgbvec *f)
+{
+ const int prev[3] = {PREV(r), PREV(g), PREV(b)};
+ const int next[3] = {NEXT(r), NEXT(g), NEXT(b)};
+ const struct rgbvec c000 = lut3d->lut[prev[0]][prev[1]][prev[2]];
+ const struct rgbvec c001 = lut3d->lut[prev[0]][prev[1]][next[2]];
+ const struct rgbvec c010 = lut3d->lut[prev[0]][next[1]][prev[2]];
+ const struct rgbvec c011 = lut3d->lut[prev[0]][next[1]][next[2]];
+ const struct rgbvec c100 = lut3d->lut[next[0]][prev[1]][prev[2]];
+ const struct rgbvec c101 = lut3d->lut[next[0]][prev[1]][next[2]];
+ const struct rgbvec c110 = lut3d->lut[next[0]][next[1]][prev[2]];
+ const struct rgbvec c111 = lut3d->lut[next[0]][next[1]][next[2]];
+ struct rgbvec c;
+ if (f->r > f->g) {
+ if (f->g > f->b) {
+ c.r = (1-f->r) * c000.r + (f->r-f->g) * c100.r + (f->g-f->b) * c110.r + (f->b) * c111.r;
+ c.g = (1-f->r) * c000.g + (f->r-f->g) * c100.g + (f->g-f->b) * c110.g + (f->b) * c111.g;
+ c.b = (1-f->r) * c000.b + (f->r-f->g) * c100.b + (f->g-f->b) * c110.b + (f->b) * c111.b;
+ } else if (f->r > f->b) {
+ c.r = (1-f->r) * c000.r + (f->r-f->b) * c100.r + (f->b-f->g) * c101.r + (f->g) * c111.r;
+ c.g = (1-f->r) * c000.g + (f->r-f->b) * c100.g + (f->b-f->g) * c101.g + (f->g) * c111.g;
+ c.b = (1-f->r) * c000.b + (f->r-f->b) * c100.b + (f->b-f->g) * c101.b + (f->g) * c111.b;
+ } else {
+ c.r = (1-f->b) * c000.r + (f->b-f->r) * c001.r + (f->r-f->g) * c101.r + (f->g) * c111.r;
+ c.g = (1-f->b) * c000.g + (f->b-f->r) * c001.g + (f->r-f->g) * c101.g + (f->g) * c111.g;
+ c.b = (1-f->b) * c000.b + (f->b-f->r) * c001.b + (f->r-f->g) * c101.b + (f->g) * c111.b;
+ }
+ } else {
+ if (f->b > f->g) {
+ c.r = (1-f->b) * c000.r + (f->b-f->g) * c001.r + (f->g-f->r) * c011.r + (f->r) * c111.r;
+ c.g = (1-f->b) * c000.g + (f->b-f->g) * c001.g + (f->g-f->r) * c011.g + (f->r) * c111.g;
+ c.b = (1-f->b) * c000.b + (f->b-f->g) * c001.b + (f->g-f->r) * c011.b + (f->r) * c111.b;
+ } else if (f->b > f->r) {
+ c.r = (1-f->g) * c000.r + (f->g-f->b) * c010.r + (f->b-f->r) * c011.r + (f->r) * c111.r;
+ c.g = (1-f->g) * c000.g + (f->g-f->b) * c010.g + (f->b-f->r) * c011.g + (f->r) * c111.g;
+ c.b = (1-f->g) * c000.b + (f->g-f->b) * c010.b + (f->b-f->r) * c011.b + (f->r) * c111.b;
+ } else {
+ c.r = (1-f->g) * c000.r + (f->g-f->r) * c010.r + (f->r-f->b) * c110.r + (f->b) * c111.r;
+ c.g = (1-f->g) * c000.g + (f->g-f->r) * c010.g + (f->r-f->b) * c110.g + (f->b) * c111.g;
+ c.b = (1-f->g) * c000.b + (f->g-f->r) * c010.b + (f->r-f->b) * c110.b + (f->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 size = (1<<nbits) - 1; \
+ const struct rgbvec s = { \
+ r * (lut3d->lutsize - 1) / size, \
+ g * (lut3d->lutsize - 1) / size, \
+ b * (lut3d->lutsize - 1) / size, \
+ }; \
+ const struct rgbvec f = { r / size, g / size, b / size}; \
+ return interp_##name(lut3d, &s, &f); \
+}
+
+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 == '#';
+}
+
+/* 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];
+
+ do {
+ if (!fgets(line, sizeof(line), f)) {
+ av_log(ctx, AV_LOG_ERROR, "unexpected EOF\n");
+ return AVERROR_INVALIDDATA;
+ }
+ } while (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);
+
+ 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 {
+ if (!fgets(line, sizeof(line), f)) {
+ av_log(ctx, AV_LOG_ERROR, "unexpected EOF\n");
+ return AVERROR_INVALIDDATA;
+ }
+ 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));
+ sscanf(line, "%f %f %f", &vec->r, &vec->g, &vec->b);
+ 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];
+
+ do {
+ if (!fgets(line, sizeof(line), f)) {
+ av_log(ctx, AV_LOG_ERROR, "unexpected EOF\n");
+ return AVERROR_INVALIDDATA;
+ }
+ } while (skip_line(line));
+
+ sscanf(line, "%d %d %d", &r, &g, &b);
+ vec->r = r / scale;
+ vec->g = g / scale;
+ vec->b = b / scale;
+ }
+ }
+ }
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ int ret;
+ FILE *f;
+ const char *ext;
+ LUT3DContext *lut3d = ctx->priv;
+
+ if (!lut3d->file) {
+ av_log(ctx, AV_LOG_ERROR, "LUT 3D input file is mandatory\n");
+ return AVERROR(EINVAL);
+ }
+
+ 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 {
+ 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:
+ if (inlink->format == AV_PIX_FMT_RGB48 ||
+ inlink->format == AV_PIX_FMT_RGBA64) {
+ lut3d->rgba_map[R] = 0;
+ lut3d->rgba_map[G] = 1;
+ lut3d->rgba_map[B] = 2;
+ lut3d->rgba_map[A] = 3;
+ } else {
+ lut3d->rgba_map[R] = 2;
+ lut3d->rgba_map[G] = 1;
+ lut3d->rgba_map[B] = 0;
+ lut3d->rgba_map[A] = 3;
+ }
+ lut3d->is16bit = 1;
+ break;
+ default:
+ 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 * ((1<<nbits) - 1)); \
+ dst[x + g] = av_clip_uint##nbits(vec.g * ((1<<nbits) - 1)); \
+ dst[x + b] = av_clip_uint##nbits(vec.b * ((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,
+};
--
1.8.2.2
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