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mpv/video/out/opengl/lcms.c

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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*
* You can alternatively redistribute this file 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.
*/
#include <string.h>
#include "mpv_talloc.h"
#include "config.h"
#include "stream/stream.h"
#include "common/common.h"
#include "misc/bstr.h"
#include "common/msg.h"
#include "options/m_option.h"
#include "options/path.h"
#include "video.h"
#include "lcms.h"
#include "osdep/io.h"
#if HAVE_LCMS2
#include <lcms2.h>
#include <libavutil/sha.h>
#include <libavutil/mem.h>
struct gl_lcms {
void *icc_data;
size_t icc_size;
char *icc_path;
bool changed;
struct mp_log *log;
struct mpv_global *global;
struct mp_icc_opts opts;
};
static bool parse_3dlut_size(const char *arg, int *p1, int *p2, int *p3)
{
if (sscanf(arg, "%dx%dx%d", p1, p2, p3) != 3)
return false;
for (int n = 0; n < 3; n++) {
int s = ((int[]) { *p1, *p2, *p3 })[n];
if (s < 2 || s > 512 || ((s - 1) & s))
return false;
}
return true;
}
static int validate_3dlut_size_opt(struct mp_log *log, const m_option_t *opt,
struct bstr name, struct bstr param)
{
int p1, p2, p3;
char s[20];
snprintf(s, sizeof(s), "%.*s", BSTR_P(param));
return parse_3dlut_size(s, &p1, &p2, &p3);
}
#define OPT_BASE_STRUCT struct mp_icc_opts
const struct m_sub_options mp_icc_conf = {
.opts = (const m_option_t[]) {
OPT_STRING("icc-profile", profile, 0),
OPT_FLAG("icc-profile-auto", profile_auto, 0),
OPT_STRING("icc-cache-dir", cache_dir, 0),
OPT_INT("icc-intent", intent, 0),
OPT_STRING_VALIDATE("3dlut-size", size_str, 0, validate_3dlut_size_opt),
OPT_REMOVED("icc-cache", "see icc-cache-dir"),
{0}
},
.size = sizeof(struct mp_icc_opts),
.defaults = &(const struct mp_icc_opts) {
.size_str = "128x256x64",
.intent = INTENT_RELATIVE_COLORIMETRIC,
},
};
static void lcms2_error_handler(cmsContext ctx, cmsUInt32Number code,
const char *msg)
{
struct gl_lcms *p = cmsGetContextUserData(ctx);
MP_ERR(p, "lcms2: %s\n", msg);
}
static bool load_profile(struct gl_lcms *p)
{
if (p->icc_data && p->icc_size)
return true;
if (!p->icc_path)
return false;
char *fname = mp_get_user_path(NULL, p->global, p->icc_path);
MP_VERBOSE(p, "Opening ICC profile '%s'\n", fname);
struct bstr iccdata = stream_read_file(fname, p, p->global,
100000000); // 100 MB
talloc_free(fname);
if (!iccdata.len)
return false;
p->icc_data = iccdata.start;
p->icc_size = iccdata.len;
return true;
}
struct gl_lcms *gl_lcms_init(void *talloc_ctx, struct mp_log *log,
struct mpv_global *global)
{
struct gl_lcms *p = talloc_ptrtype(talloc_ctx, p);
*p = (struct gl_lcms) {
.global = global,
.log = log,
.changed = true,
};
return p;
}
void gl_lcms_set_options(struct gl_lcms *p, struct mp_icc_opts *opts)
{
p->opts = *opts;
p->icc_path = talloc_strdup(p, p->opts.profile);
load_profile(p);
p->changed = true; // probably
}
// Warning: profile.start must point to a ta allocation, and the function
// takes over ownership.
void gl_lcms_set_memory_profile(struct gl_lcms *p, bstr *profile)
{
if (!p->opts.profile_auto) {
talloc_free(profile->start);
return;
}
if (!p->icc_path && p->icc_data && profile->start &&
profile->len == p->icc_size &&
memcmp(profile->start, p->icc_data, p->icc_size) == 0)
{
talloc_free(profile->start);
return;
}
p->changed = true;
talloc_free(p->icc_path);
p->icc_path = NULL;
talloc_free(p->icc_data);
p->icc_data = talloc_steal(p, profile->start);
p->icc_size = profile->len;
}
// Return and _reset_ whether the lookul table has changed since the last call.
// If it has changed, gl_lcms_get_lut3d() should be called.
bool gl_lcms_has_changed(struct gl_lcms *p)
{
bool change = p->changed;
p->changed = false;
return change;
}
bool gl_lcms_get_lut3d(struct gl_lcms *p, struct lut3d **result_lut3d)
{
int s_r, s_g, s_b;
bool result = false;
if (!parse_3dlut_size(p->opts.size_str, &s_r, &s_g, &s_b))
return false;
if (!p->icc_data && !p->icc_path)
return false;
void *tmp = talloc_new(NULL);
uint16_t *output = talloc_array(tmp, uint16_t, s_r * s_g * s_b * 3);
struct lut3d *lut = NULL;
cmsContext cms = NULL;
char *cache_file = NULL;
if (p->opts.cache_dir && p->opts.cache_dir[0]) {
// Gamma is included in the header to help uniquely identify it,
// because we may change the parameter in the future or make it
// customizable, same for the primaries.
char *cache_info = talloc_asprintf(tmp,
"ver=1.1, intent=%d, size=%dx%dx%d, gamma=2.4, prim=bt2020\n",
p->opts.intent, s_r, s_g, s_b);
uint8_t hash[32];
struct AVSHA *sha = av_sha_alloc();
if (!sha)
abort();
av_sha_init(sha, 256);
av_sha_update(sha, cache_info, strlen(cache_info));
av_sha_update(sha, p->icc_data, p->icc_size);
av_sha_final(sha, hash);
av_free(sha);
char *cache_dir = mp_get_user_path(tmp, p->global, p->opts.cache_dir);
cache_file = talloc_strdup(tmp, "");
for (int i = 0; i < sizeof(hash); i++)
cache_file = talloc_asprintf_append(cache_file, "%02X", hash[i]);
cache_file = mp_path_join(tmp, cache_dir, cache_file);
mp_mkdirp(cache_dir);
}
// check cache
if (cache_file) {
MP_VERBOSE(p, "Opening 3D LUT cache in file '%s'.\n", cache_file);
struct bstr cachedata = stream_read_file(cache_file, tmp, p->global,
1000000000); // 1 GB
if (cachedata.len == talloc_get_size(output)) {
memcpy(output, cachedata.start, cachedata.len);
goto done;
} else {
MP_WARN(p, "3D LUT cache invalid!\n");
}
}
cms = cmsCreateContext(NULL, p);
if (!cms)
goto error_exit;
cmsSetLogErrorHandlerTHR(cms, lcms2_error_handler);
cmsHPROFILE profile =
cmsOpenProfileFromMemTHR(cms, p->icc_data, p->icc_size);
if (!profile)
goto error_exit;
// We always generate the 3DLUT against BT.2020, and transform into this
// space inside the shader if the source differs.
struct mp_csp_primaries csp = mp_get_csp_primaries(MP_CSP_PRIM_BT_2020);
cmsCIExyY wp = {csp.white.x, csp.white.y, 1.0};
cmsCIExyYTRIPLE prim = {
.Red = {csp.red.x, csp.red.y, 1.0},
.Green = {csp.green.x, csp.green.y, 1.0},
.Blue = {csp.blue.x, csp.blue.y, 1.0},
};
// 2.4 is arbitrarily used as a gamma compression factor for the 3DLUT,
// reducing artifacts due to rounding errors on wide gamut profiles
cmsToneCurve *tonecurve = cmsBuildGamma(cms, 2.4);
cmsHPROFILE vid_profile = cmsCreateRGBProfileTHR(cms, &wp, &prim,
(cmsToneCurve*[3]){tonecurve, tonecurve, tonecurve});
cmsFreeToneCurve(tonecurve);
cmsHTRANSFORM trafo = cmsCreateTransformTHR(cms, vid_profile, TYPE_RGB_16,
profile, TYPE_RGB_16,
p->opts.intent,
cmsFLAGS_HIGHRESPRECALC);
cmsCloseProfile(profile);
cmsCloseProfile(vid_profile);
if (!trafo)
goto error_exit;
// transform a (s_r)x(s_g)x(s_b) cube, with 3 components per channel
uint16_t *input = talloc_array(tmp, uint16_t, s_r * 3);
for (int b = 0; b < s_b; b++) {
for (int g = 0; g < s_g; g++) {
for (int r = 0; r < s_r; r++) {
input[r * 3 + 0] = r * 65535 / (s_r - 1);
input[r * 3 + 1] = g * 65535 / (s_g - 1);
input[r * 3 + 2] = b * 65535 / (s_b - 1);
}
size_t base = (b * s_r * s_g + g * s_r) * 3;
cmsDoTransform(trafo, input, output + base, s_r);
}
}
cmsDeleteTransform(trafo);
if (cache_file) {
FILE *out = fopen(cache_file, "wb");
if (out) {
fwrite(output, talloc_get_size(output), 1, out);
fclose(out);
}
}
done: ;
lut = talloc_ptrtype(NULL, lut);
*lut = (struct lut3d) {
.data = talloc_steal(lut, output),
.size = {s_r, s_g, s_b},
};
*result_lut3d = lut;
result = true;
error_exit:
if (cms)
cmsDeleteContext(cms);
if (!lut)
MP_FATAL(p, "Error loading ICC profile.\n");
talloc_free(tmp);
return result;
}
#else /* HAVE_LCMS2 */
const struct m_sub_options mp_icc_conf = {
.opts = (const m_option_t[]) { {0} },
.size = sizeof(struct mp_icc_opts),
.defaults = &(const struct mp_icc_opts) {0},
};
struct gl_lcms *gl_lcms_init(void *talloc_ctx, struct mp_log *log,
struct mpv_global *global)
{
return (struct gl_lcms *) talloc_new(talloc_ctx);
}
void gl_lcms_set_options(struct gl_lcms *p, struct mp_icc_opts *opts) { }
void gl_lcms_set_memory_profile(struct gl_lcms *p, bstr *profile) { }
bool gl_lcms_get_lut3d(struct gl_lcms *p, struct lut3d **x) { return false; }
bool gl_lcms_has_changed(struct gl_lcms *p) { return false; }
#endif
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