[FFmpeg-devel] [PATCH] lavfi: add lut3d filter.
Stefano Sabatini
stefasab at gmail.com
Wed May 22 10:06:56 CEST 2013
On date Tuesday 2013-05-21 04:49:06 +0200, Clément Bœsch encoded:
> Fixes Ticket #2517.
>
> TODO: minor bump
> ---
> Changelog | 1 +
> doc/filters.texi | 32 +++
> libavfilter/Makefile | 1 +
> libavfilter/allfilters.c | 1 +
> libavfilter/vf_lut3d.c | 570 +++++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 605 insertions(+)
> create mode 100644 libavfilter/vf_lut3d.c
>
> diff --git a/Changelog b/Changelog
> index 2ed6c87..91ab2e1 100644
> --- a/Changelog
> +++ b/Changelog
> @@ -52,6 +52,7 @@ version <next>:
> - Escape 130 video decoder
> - FTP protocol support
> - V4L2 output device
> +- 3D LUT filter (lut3d)
>
>
> version 1.2:
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 301887d..325c0ba 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -4595,6 +4595,38 @@ 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.
> +
> +Currently supported formats:
> + at itemize
> + at item 3dl
> + at item cube
> + at item dat
> + at item m3d
> + at end itemize
Adding some notes about these types may help (software used to create
them, reference, etc., so the user is not at the mercy of a search
engine).
Also I think having a tool for generating files in these formats
(e.g. using an ff expression) would be useful. Attaching a sample file
would also help to test it.
> + at item interp
> +Select interpolation mode.
> +
> +Available values are:
> +
> + at table @samp
> + at item nearest
> +Use values from the nearest defined point.
> + 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 d51af94..6cc2930 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -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
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index 07d7da0..0f2442d 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -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);
> diff --git a/libavfilter/vf_lut3d.c b/libavfilter/vf_lut3d.c
> new file mode 100644
> index 0000000..d2cb84f
> --- /dev/null
> +++ b/libavfilter/vf_lut3d.c
> @@ -0,0 +1,570 @@
> +/*
> + * 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
> + */
> +
> +/**
> + * @todo Hald CLUT?
missing @file notice.
"Hald CLUT" sounds like funny nonsense to me.
> + */
> +
> +#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(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;
> +}
> +
> +static inline struct rgbvec interp_nearest(const LUT3DContext *lut3d,
> + const struct rgbvec *s)
> +{
> +#define NEAR(x) ((int)(s->x + .5))
> + return lut3d->lut[NEAR(r)][NEAR(g)][NEAR(b)];
> +}
> +
> +#define PREV(x) ((int) s->x )
> +#define NEXT(x) ((int)(s->x + 1))
I'm not fond of this kind of macros which assume the existence of a
variable, please make s a formal parameter and/or move the macro
within the function definition where it is used.
> +
> +static inline struct rgbvec interp_trilinear(const LUT3DContext *lut3d,
> + const struct rgbvec *s)
"s" is a poor name
> +{
> + const int prev[3] = {PREV(r), PREV(g), PREV(b)};
> + const int next[3] = {NEXT(r), NEXT(g), NEXT(b)};
> + const struct rgbvec d = {s->r - prev[0], s->g - prev[1], s->b - prev[2]};
> + 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, 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;
> +}
> +
> +static inline struct rgbvec interp_tetrahedral(const LUT3DContext *lut3d,
> + const struct rgbvec *s)
ditto
> +{
> + const int prev[3] = {PREV(r), PREV(g), PREV(b)};
> + const int next[3] = {NEXT(r), NEXT(g), NEXT(b)};
> + const struct rgbvec d = {s->r - prev[0], s->g - prev[1], s->b - prev[2]};
> + 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 (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;
> +}
For non trivial math a reference to an article/book/resource where you
find the formulas is always good for the reader.
> +
> +#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 s = {r * scale, g * scale, b * scale}; \
> + return interp_##name(lut3d, &s); \
> +}
> +
> +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);
> +}
I can't spot apparent mistakes, very nice job.
--
FFmpeg = Fast Fast Minimal Proud Enlightened Gem
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