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avfilter/vf_lut3d: prelut support for 3d cinespace luts 

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
tags/n4.3
Mark Reid Michael Niedermayer 5 years ago
parent
57564a2cfc
commit
a1221b96d8
1 changed files with 317 additions and 55 deletions
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  1. +317
    -55
      libavfilter/vf_lut3d.c

+ 317
- 55
libavfilter/vf_lut3d.c View File

@@ -59,6 +59,15 @@ struct rgbvec {
/* 3D LUT don't often go up to level 32, but it is common to have a Hald CLUT
* of 512x512 (64x64x64) */
#define MAX_LEVEL 256
#define PRELUT_SIZE 65536

typedef struct Lut3DPreLut {
int size;
float min[3];
float max[3];
float scale[3];
float* lut[3];
} Lut3DPreLut;

typedef struct LUT3DContext {
const AVClass *class;
@@ -71,6 +80,7 @@ typedef struct LUT3DContext {
struct rgbvec *lut;
int lutsize;
int lutsize2;
Lut3DPreLut prelut;
#if CONFIG_HALDCLUT_FILTER
uint8_t clut_rgba_map[4];
int clut_step;
@@ -234,11 +244,39 @@ static inline struct rgbvec interp_tetrahedral(const LUT3DContext *lut3d,
return c;
}

static inline float prelut_interp_1d_linear(const Lut3DPreLut *prelut,
int idx, const float s)
{
const int lut_max = prelut->size - 1;
const float scaled = (s - prelut->min[idx]) * prelut->scale[idx];
const float x = av_clipf(scaled, 0.0f, lut_max);
const int prev = PREV(x);
const int next = FFMIN((int)(x) + 1, lut_max);
const float p = prelut->lut[idx][prev];
const float n = prelut->lut[idx][next];
const float d = x - (float)prev;
return lerpf(p, n, d);
}

static inline struct rgbvec apply_prelut(const Lut3DPreLut *prelut,
const struct rgbvec *s)
{
if (prelut->size <= 0)
return *s;

struct rgbvec c;
c.r = prelut_interp_1d_linear(prelut, 0, s->r);
c.g = prelut_interp_1d_linear(prelut, 1, s->g);
c.b = prelut_interp_1d_linear(prelut, 2, s->b);
return c;
}

#define DEFINE_INTERP_FUNC_PLANAR(name, nbits, depth) \
static int interp_##nbits##_##name##_p##depth(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
{ \
int x, y; \
const LUT3DContext *lut3d = ctx->priv; \
const Lut3DPreLut *prelut = &lut3d->prelut; \
const ThreadData *td = arg; \
const AVFrame *in = td->in; \
const AVFrame *out = td->out; \
@@ -253,9 +291,11 @@ static int interp_##nbits##_##name##_p##depth(AVFilterContext *ctx, void *arg, i
const uint8_t *srcbrow = in->data[1] + slice_start * in->linesize[1]; \
const uint8_t *srcrrow = in->data[2] + slice_start * in->linesize[2]; \
const uint8_t *srcarow = in->data[3] + slice_start * in->linesize[3]; \
const float scale_r = (lut3d->scale.r / ((1<<depth) - 1)) * (lut3d->lutsize - 1); \
const float scale_g = (lut3d->scale.g / ((1<<depth) - 1)) * (lut3d->lutsize - 1); \
const float scale_b = (lut3d->scale.b / ((1<<depth) - 1)) * (lut3d->lutsize - 1); \
const float lut_max = lut3d->lutsize - 1; \
const float scale_f = 1.0f / ((1<<depth) - 1); \
const float scale_r = lut3d->scale.r * lut_max; \
const float scale_g = lut3d->scale.g * lut_max; \
const float scale_b = lut3d->scale.b * lut_max; \
\
for (y = slice_start; y < slice_end; y++) { \
uint##nbits##_t *dstg = (uint##nbits##_t *)grow; \
@@ -267,9 +307,13 @@ static int interp_##nbits##_##name##_p##depth(AVFilterContext *ctx, void *arg, i
const uint##nbits##_t *srcr = (const uint##nbits##_t *)srcrrow; \
const uint##nbits##_t *srca = (const uint##nbits##_t *)srcarow; \
for (x = 0; x < in->width; x++) { \
const struct rgbvec scaled_rgb = {srcr[x] * scale_r, \
srcg[x] * scale_g, \
srcb[x] * scale_b}; \
const struct rgbvec rgb = {srcr[x] * scale_f, \
srcg[x] * scale_f, \
srcb[x] * scale_f}; \
const struct rgbvec prelut_rgb = apply_prelut(prelut, &rgb); \
const struct rgbvec scaled_rgb = {av_clipf(prelut_rgb.r * scale_r, 0, lut_max), \
av_clipf(prelut_rgb.g * scale_g, 0, lut_max), \
av_clipf(prelut_rgb.b * scale_b, 0, lut_max)}; \
struct rgbvec vec = interp_##name(lut3d, &scaled_rgb); \
dstr[x] = av_clip_uintp2(vec.r * (float)((1<<depth) - 1), depth); \
dstg[x] = av_clip_uintp2(vec.g * (float)((1<<depth) - 1), depth); \
@@ -318,6 +362,7 @@ static int interp_##name##_pf##depth(AVFilterContext *ctx, void *arg, int jobnr,
{ \
int x, y; \
const LUT3DContext *lut3d = ctx->priv; \
const Lut3DPreLut *prelut = &lut3d->prelut; \
const ThreadData *td = arg; \
const AVFrame *in = td->in; \
const AVFrame *out = td->out; \
@@ -332,10 +377,10 @@ static int interp_##name##_pf##depth(AVFilterContext *ctx, void *arg, int jobnr,
const uint8_t *srcbrow = in->data[1] + slice_start * in->linesize[1]; \
const uint8_t *srcrrow = in->data[2] + slice_start * in->linesize[2]; \
const uint8_t *srcarow = in->data[3] + slice_start * in->linesize[3]; \
const float lutsize = lut3d->lutsize - 1; \
const float scale_r = lut3d->scale.r * lutsize; \
const float scale_g = lut3d->scale.g * lutsize; \
const float scale_b = lut3d->scale.b * lutsize; \
const float lut_max = lut3d->lutsize - 1; \
const float scale_r = lut3d->scale.r * lut_max; \
const float scale_g = lut3d->scale.g * lut_max; \
const float scale_b = lut3d->scale.b * lut_max; \
\
for (y = slice_start; y < slice_end; y++) { \
float *dstg = (float *)grow; \
@@ -347,9 +392,13 @@ static int interp_##name##_pf##depth(AVFilterContext *ctx, void *arg, int jobnr,
const float *srcr = (const float *)srcrrow; \
const float *srca = (const float *)srcarow; \
for (x = 0; x < in->width; x++) { \
const struct rgbvec scaled_rgb = {av_clipf(sanitizef(srcr[x]) * scale_r, 0, lutsize), \
av_clipf(sanitizef(srcg[x]) * scale_g, 0, lutsize), \
av_clipf(sanitizef(srcb[x]) * scale_b, 0, lutsize)}; \
const struct rgbvec rgb = {sanitizef(srcr[x]), \
sanitizef(srcg[x]), \
sanitizef(srcb[x])}; \
const struct rgbvec prelut_rgb = apply_prelut(prelut, &rgb); \
const struct rgbvec scaled_rgb = {av_clipf(prelut_rgb.r * scale_r, 0, lut_max), \
av_clipf(prelut_rgb.g * scale_g, 0, lut_max), \
av_clipf(prelut_rgb.b * scale_b, 0, lut_max)}; \
struct rgbvec vec = interp_##name(lut3d, &scaled_rgb); \
dstr[x] = vec.r; \
dstg[x] = vec.g; \
@@ -378,6 +427,7 @@ static int interp_##nbits##_##name(AVFilterContext *ctx, void *arg, int jobnr, i
{ \
int x, y; \
const LUT3DContext *lut3d = ctx->priv; \
const Lut3DPreLut *prelut = &lut3d->prelut; \
const ThreadData *td = arg; \
const AVFrame *in = td->in; \
const AVFrame *out = td->out; \
@@ -391,17 +441,23 @@ static int interp_##nbits##_##name(AVFilterContext *ctx, void *arg, int jobnr, i
const int slice_end = (in->height * (jobnr+1)) / nb_jobs; \
uint8_t *dstrow = out->data[0] + slice_start * out->linesize[0]; \
const uint8_t *srcrow = in ->data[0] + slice_start * in ->linesize[0]; \
const float scale_r = (lut3d->scale.r / ((1<<nbits) - 1)) * (lut3d->lutsize - 1); \
const float scale_g = (lut3d->scale.g / ((1<<nbits) - 1)) * (lut3d->lutsize - 1); \
const float scale_b = (lut3d->scale.b / ((1<<nbits) - 1)) * (lut3d->lutsize - 1); \
const float lut_max = lut3d->lutsize - 1; \
const float scale_f = 1.0f / ((1<<nbits) - 1); \
const float scale_r = lut3d->scale.r * lut_max; \
const float scale_g = lut3d->scale.g * lut_max; \
const float scale_b = lut3d->scale.b * lut_max; \
\
for (y = slice_start; y < slice_end; y++) { \
uint##nbits##_t *dst = (uint##nbits##_t *)dstrow; \
const uint##nbits##_t *src = (const uint##nbits##_t *)srcrow; \
for (x = 0; x < in->width * step; x += step) { \
const struct rgbvec scaled_rgb = {src[x + r] * scale_r, \
src[x + g] * scale_g, \
src[x + b] * scale_b}; \
const struct rgbvec rgb = {src[x + r] * scale_f, \
src[x + g] * scale_f, \
src[x + b] * scale_f}; \
const struct rgbvec prelut_rgb = apply_prelut(prelut, &rgb); \
const struct rgbvec scaled_rgb = {av_clipf(prelut_rgb.r * scale_r, 0, lut_max), \
av_clipf(prelut_rgb.g * scale_g, 0, lut_max), \
av_clipf(prelut_rgb.b * scale_b, 0, lut_max)}; \
struct rgbvec vec = interp_##name(lut3d, &scaled_rgb); \
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)); \
@@ -432,6 +488,40 @@ static int skip_line(const char *p)
return !*p || *p == '#';
}

static char* fget_next_word(char* dst, int max, FILE* f)
{
int c;
char *p = dst;

/* for null */
max--;
/* skip until next non whitespace char */
while ((c = fgetc(f)) != EOF) {
if (av_isspace(c))
continue;

*p++ = c;
max--;
break;
}

/* get max bytes or up until next whitespace char */
for (; max > 0; max--) {
if ((c = fgetc(f)) == EOF)
break;

if (av_isspace(c))
break;

*p++ = c;
}

*p = 0;
if (p == dst)
return NULL;
return p;
}

#define NEXT_LINE(loop_cond) do { \
if (!fgets(line, sizeof(line), f)) { \
av_log(ctx, AV_LOG_ERROR, "Unexpected EOF\n"); \
@@ -439,10 +529,18 @@ static int skip_line(const char *p)
} \
} while (loop_cond)

static int allocate_3dlut(AVFilterContext *ctx, int lutsize)
#define NEXT_LINE_OR_GOTO(loop_cond, label) do { \
if (!fgets(line, sizeof(line), f)) { \
av_log(ctx, AV_LOG_ERROR, "Unexpected EOF\n"); \
ret = AVERROR_INVALIDDATA; \
goto label; \
} \
} while (loop_cond)

static int allocate_3dlut(AVFilterContext *ctx, int lutsize, int prelut)
{
LUT3DContext *lut3d = ctx->priv;

int i;
if (lutsize < 2 || lutsize > MAX_LEVEL) {
av_log(ctx, AV_LOG_ERROR, "Too large or invalid 3D LUT size\n");
return AVERROR(EINVAL);
@@ -452,6 +550,21 @@ static int allocate_3dlut(AVFilterContext *ctx, int lutsize)
lut3d->lut = av_malloc_array(lutsize * lutsize * lutsize, sizeof(*lut3d->lut));
if (!lut3d->lut)
return AVERROR(ENOMEM);

if (prelut) {
lut3d->prelut.size = PRELUT_SIZE;
for (i = 0; i < 3; i++) {
av_freep(&lut3d->prelut.lut[i]);
lut3d->prelut.lut[i] = av_malloc_array(PRELUT_SIZE, sizeof(*lut3d->prelut.lut[0]));
if (!lut3d->prelut.lut[i])
return AVERROR(ENOMEM);
}
} else {
lut3d->prelut.size = 0;
for (i = 0; i < 3; i++) {
av_freep(&lut3d->prelut.lut[i]);
}
}
lut3d->lutsize = lutsize;
lut3d->lutsize2 = lutsize * lutsize;
return 0;
@@ -475,7 +588,7 @@ static int parse_dat(AVFilterContext *ctx, FILE *f)
NEXT_LINE(skip_line(line));
}

ret = allocate_3dlut(ctx, size);
ret = allocate_3dlut(ctx, size, 0);
if (ret < 0)
return ret;

@@ -507,7 +620,7 @@ static int parse_cube(AVFilterContext *ctx, FILE *f)
const int size = strtol(line + 12, NULL, 0);
const int size2 = size * size;

ret = allocate_3dlut(ctx, size);
ret = allocate_3dlut(ctx, size, 0);
if (ret < 0)
return ret;

@@ -562,7 +675,7 @@ static int parse_3dl(AVFilterContext *ctx, FILE *f)

lut3d->lutsize = size;

ret = allocate_3dlut(ctx, size);
ret = allocate_3dlut(ctx, size, 0);
if (ret < 0)
return ret;

@@ -631,7 +744,7 @@ static int parse_m3d(AVFilterContext *ctx, FILE *f)
lut3d->lutsize = size;
size2 = size * size;

ret = allocate_3dlut(ctx, size);
ret = allocate_3dlut(ctx, size, 0);
if (ret < 0)
return ret;

@@ -655,6 +768,44 @@ static int parse_m3d(AVFilterContext *ctx, FILE *f)
return 0;
}

static int nearest_sample_index(float *data, float x, int low, int hi)
{
int mid;
if (x < data[low])
return low;

if (x > data[hi])
return hi;

for (;;) {
av_assert0(x >= data[low]);
av_assert0(x <= data[hi]);
av_assert0((hi-low) > 0);

if (hi - low == 1)
return low;

mid = (low + hi) / 2;

if (x < data[mid])
hi = mid;
else
low = mid;
}

return 0;
}

#define NEXT_FLOAT_OR_GOTO(value, label) \
if (!fget_next_word(line, sizeof(line) ,f)) { \
ret = AVERROR_INVALIDDATA; \
goto label; \
} \
if (av_sscanf(line, "%f", &value) != 1) { \
ret = AVERROR_INVALIDDATA; \
goto label; \
}

static int parse_cinespace(AVFilterContext *ctx, FILE *f)
{
LUT3DContext *lut3d = ctx->priv;
@@ -663,22 +814,30 @@ static int parse_cinespace(AVFilterContext *ctx, FILE *f)
float in_max[3] = {1.0, 1.0, 1.0};
float out_min[3] = {0.0, 0.0, 0.0};
float out_max[3] = {1.0, 1.0, 1.0};
int ret, inside_metadata = 0, size, size2;
int inside_metadata = 0, size, size2;
int prelut = 0;
int ret = 0;

NEXT_LINE(skip_line(line));
int prelut_sizes[3] = {0, 0, 0};
float *in_prelut[3] = {NULL, NULL, NULL};
float *out_prelut[3] = {NULL, NULL, NULL};

NEXT_LINE_OR_GOTO(skip_line(line), end);
if (strncmp(line, "CSPLUTV100", 10)) {
av_log(ctx, AV_LOG_ERROR, "Not cineSpace LUT format\n");
return AVERROR(EINVAL);
ret = AVERROR(EINVAL);
goto end;
}

NEXT_LINE(skip_line(line));
NEXT_LINE_OR_GOTO(skip_line(line), end);
if (strncmp(line, "3D", 2)) {
av_log(ctx, AV_LOG_ERROR, "Not 3D LUT format\n");
return AVERROR(EINVAL);
ret = AVERROR(EINVAL);
goto end;
}

while (1) {
NEXT_LINE(skip_line(line));
NEXT_LINE_OR_GOTO(skip_line(line), end);

if (!strncmp(line, "BEGIN METADATA", 14)) {
inside_metadata = 1;
@@ -694,31 +853,94 @@ static int parse_cinespace(AVFilterContext *ctx, FILE *f)
for (int i = 0; i < 3; i++) {
int npoints = strtol(line, NULL, 0);

if (npoints != 2) {
if (npoints > 2) {
float v,last;

if (npoints > PRELUT_SIZE) {
av_log(ctx, AV_LOG_ERROR, "Prelut size too large.\n");
ret = AVERROR_INVALIDDATA;
goto end;
}

if (in_prelut[i] || out_prelut[i]) {
av_log(ctx, AV_LOG_ERROR, "Invalid file has multiple preluts.\n");
ret = AVERROR_INVALIDDATA;
goto end;
}

in_prelut[i] = (float*)av_malloc(npoints * sizeof(float));
out_prelut[i] = (float*)av_malloc(npoints * sizeof(float));
if (!in_prelut[i] || !out_prelut[i]) {
ret = AVERROR(ENOMEM);
goto end;
}

prelut_sizes[i] = npoints;
in_min[i] = FLT_MAX;
in_max[i] = FLT_MIN;
out_min[i] = FLT_MAX;
out_max[i] = FLT_MIN;

last = FLT_MIN;

for (int j = 0; j < npoints; j++) {
NEXT_FLOAT_OR_GOTO(v, end)
in_min[i] = FFMIN(in_min[i], v);
in_max[i] = FFMAX(in_max[i], v);
in_prelut[i][j] = v;
if (v < last) {
av_log(ctx, AV_LOG_ERROR, "Invalid file, non increasing prelut.\n");
ret = AVERROR(ENOMEM);
goto end;
}
last = v;
}

for (int j = 0; j < npoints; j++) {
NEXT_FLOAT_OR_GOTO(v, end)
out_min[i] = FFMIN(out_min[i], v);
out_max[i] = FFMAX(out_max[i], v);
out_prelut[i][j] = v;
}

} else if (npoints == 2) {
NEXT_LINE_OR_GOTO(skip_line(line), end);
if (av_sscanf(line, "%f %f", &in_min[i], &in_max[i]) != 2) {
ret = AVERROR_INVALIDDATA;
goto end;
}
NEXT_LINE_OR_GOTO(skip_line(line), end);
if (av_sscanf(line, "%f %f", &out_min[i], &out_max[i]) != 2) {
ret = AVERROR_INVALIDDATA;
goto end;
}

} else {
av_log(ctx, AV_LOG_ERROR, "Unsupported number of pre-lut points.\n");
return AVERROR_PATCHWELCOME;
ret = AVERROR_PATCHWELCOME;
goto end;
}

NEXT_LINE(skip_line(line));
if (av_sscanf(line, "%f %f", &in_min[i], &in_max[i]) != 2)
return AVERROR_INVALIDDATA;
NEXT_LINE(skip_line(line));
if (av_sscanf(line, "%f %f", &out_min[i], &out_max[i]) != 2)
return AVERROR_INVALIDDATA;
NEXT_LINE(skip_line(line));
NEXT_LINE_OR_GOTO(skip_line(line), end);
}

if (av_sscanf(line, "%d %d %d", &size_r, &size_g, &size_b) != 3)
return AVERROR(EINVAL);
if (av_sscanf(line, "%d %d %d", &size_r, &size_g, &size_b) != 3) {
ret = AVERROR(EINVAL);
goto end;
}
if (size_r != size_g || size_r != size_b) {
av_log(ctx, AV_LOG_ERROR, "Unsupported size combination: %dx%dx%d.\n", size_r, size_g, size_b);
return AVERROR_PATCHWELCOME;
ret = AVERROR_PATCHWELCOME;
goto end;
}

size = size_r;
size2 = size * size;

ret = allocate_3dlut(ctx, size);
if (prelut_sizes[0] && prelut_sizes[1] && prelut_sizes[2])
prelut = 1;

ret = allocate_3dlut(ctx, size, prelut);
if (ret < 0)
return ret;

@@ -726,10 +948,13 @@ static int parse_cinespace(AVFilterContext *ctx, FILE *f)
for (int j = 0; j < size; j++) {
for (int i = 0; i < size; i++) {
struct rgbvec *vec = &lut3d->lut[i * size2 + j * size + k];
if (k != 0 || j != 0 || i != 0)
NEXT_LINE(skip_line(line));
if (av_sscanf(line, "%f %f %f", &vec->r, &vec->g, &vec->b) != 3)
return AVERROR_INVALIDDATA;

NEXT_LINE_OR_GOTO(skip_line(line), end);
if (av_sscanf(line, "%f %f %f", &vec->r, &vec->g, &vec->b) != 3) {
ret = AVERROR_INVALIDDATA;
goto end;
}

vec->r *= out_max[0] - out_min[0];
vec->g *= out_max[1] - out_min[1];
vec->b *= out_max[2] - out_min[2];
@@ -741,11 +966,44 @@ static int parse_cinespace(AVFilterContext *ctx, FILE *f)
}
}

lut3d->scale.r = av_clipf(1. / (in_max[0] - in_min[0]), 0.f, 1.f);
lut3d->scale.g = av_clipf(1. / (in_max[1] - in_min[1]), 0.f, 1.f);
lut3d->scale.b = av_clipf(1. / (in_max[2] - in_min[2]), 0.f, 1.f);
if (prelut) {
for (int c = 0; c < 3; c++) {

return 0;
lut3d->prelut.min[c] = in_min[c];
lut3d->prelut.max[c] = in_max[c];
lut3d->prelut.scale[c] = (1.0f / (float)(in_max[c] - in_min[c])) * (lut3d->prelut.size - 1);

for (int i = 0; i < lut3d->prelut.size; ++i) {
float mix = (float) i / (float)(lut3d->prelut.size - 1);
float x = lerpf(in_min[c], in_max[c], mix);

int idx = nearest_sample_index(in_prelut[c], x, 0, prelut_sizes[c]-1);
av_assert0(idx + 1 < prelut_sizes[c]);

float a = out_prelut[c][idx + 0];
float b = out_prelut[c][idx + 1];
mix = x - in_prelut[c][idx];

float outval = lerpf(a, b, mix);
lut3d->prelut.lut[c][i] = sanitizef(outval);
}
}
lut3d->scale.r = 1.00f;
lut3d->scale.g = 1.00f;
lut3d->scale.b = 1.00f;

} else {
lut3d->scale.r = av_clipf(1. / (in_max[0] - in_min[0]), 0.f, 1.f);
lut3d->scale.g = av_clipf(1. / (in_max[1] - in_min[1]), 0.f, 1.f);
lut3d->scale.b = av_clipf(1. / (in_max[2] - in_min[2]), 0.f, 1.f);
}

end:
for (int c = 0; c < 3; c++) {
av_freep(&in_prelut[c]);
av_freep(&out_prelut[c]);
}
return ret;
}

static int set_identity_matrix(AVFilterContext *ctx, int size)
@@ -755,7 +1013,7 @@ static int set_identity_matrix(AVFilterContext *ctx, int size)
const int size2 = size * size;
const float c = 1. / (size - 1);

ret = allocate_3dlut(ctx, size);
ret = allocate_3dlut(ctx, size, 0);
if (ret < 0)
return ret;

@@ -939,8 +1197,12 @@ end:
static av_cold void lut3d_uninit(AVFilterContext *ctx)
{
LUT3DContext *lut3d = ctx->priv;
int i;
av_freep(&lut3d->lut);

for (i = 0; i < 3; i++) {
av_freep(&lut3d->prelut.lut[i]);
}
}

static const AVFilterPad lut3d_inputs[] = {
@@ -1158,7 +1420,7 @@ static int config_clut(AVFilterLink *inlink)
return AVERROR(EINVAL);
}

return allocate_3dlut(ctx, level);
return allocate_3dlut(ctx, level, 0);
}

static int update_apply_clut(FFFrameSync *fs)


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