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mpv/video/out/gl_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 "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 "gl_video.h"
#include "gl_lcms.h"
#if HAVE_LCMS2
#include <lcms2.h>
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", cache, 0),
OPT_INT("icc-intent", intent, 0),
OPT_STRING_VALIDATE("3dlut-size", size_str, 0, validate_3dlut_size_opt),
{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 mp_log *log = cmsGetContextUserData(ctx);
mp_msg(log, MSGL_ERR, "lcms2: %s\n", msg);
}
static struct bstr load_file(void *talloc_ctx, const char *filename,
struct mpv_global *global)
{
struct bstr res = {0};
char *fname = mp_get_user_path(NULL, global, filename);
stream_t *s = stream_open(fname, global);
if (s) {
res = stream_read_complete(s, talloc_ctx, 1000000000);
free_stream(s);
}
talloc_free(fname);
return res;
}
bool mp_icc_set_profile(struct mp_icc_opts *opts, char *profile)
{
if (!opts->profile || strcmp(opts->profile, profile) != 0) {
if (opts->profile)
talloc_free(opts->profile);
opts->profile = talloc_strdup(opts, profile);
return true;
}
return false;
}
#define LUT3D_CACHE_HEADER "mpv 3dlut cache 1.0\n"
struct lut3d *mp_load_icc(struct mp_icc_opts *opts, struct mp_log *log,
struct mpv_global *global)
{
int s_r, s_g, s_b;
if (!parse_3dlut_size(opts->size_str, &s_r, &s_g, &s_b))
return NULL;
if (!opts->profile)
return NULL;
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;
mp_msg(log, MSGL_INFO, "Opening ICC profile '%s'\n", opts->profile);
struct bstr iccdata = load_file(tmp, opts->profile, global);
if (!iccdata.len)
goto error_exit;
char *cache_info =
// 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.
talloc_asprintf(tmp, "intent=%d, size=%dx%dx%d, gamma=2.4, prim=bt2020\n",
opts->intent, s_r, s_g, s_b);
// check cache
if (opts->cache) {
mp_msg(log, MSGL_INFO, "Opening 3D LUT cache in file '%s'.\n",
opts->cache);
struct bstr cachedata = load_file(tmp, opts->cache, global);
if (bstr_eatstart(&cachedata, bstr0(LUT3D_CACHE_HEADER))
&& bstr_eatstart(&cachedata, bstr0(cache_info))
&& bstr_eatstart(&cachedata, iccdata)
&& cachedata.len == talloc_get_size(output))
{
memcpy(output, cachedata.start, cachedata.len);
goto done;
} else {
mp_msg(log, MSGL_WARN, "3D LUT cache invalid!\n");
}
}
cms = cmsCreateContext(NULL, log);
if (!cms)
goto error_exit;
cmsSetLogErrorHandlerTHR(cms, lcms2_error_handler);
cmsHPROFILE profile = cmsOpenProfileFromMemTHR(cms, iccdata.start, iccdata.len);
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,
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 (opts->cache) {
char *fname = mp_get_user_path(NULL, global, opts->cache);
FILE *out = fopen(fname, "wb");
if (out) {
fprintf(out, "%s%s", LUT3D_CACHE_HEADER, cache_info);
fwrite(iccdata.start, iccdata.len, 1, out);
fwrite(output, talloc_get_size(output), 1, out);
fclose(out);
}
talloc_free(fname);
}
done: ;
lut = talloc_ptrtype(NULL, lut);
*lut = (struct lut3d) {
.data = talloc_steal(lut, output),
.size = {s_r, s_g, s_b},
};
error_exit:
if (cms)
cmsDeleteContext(cms);
if (!lut)
mp_msg(log, MSGL_FATAL, "Error loading ICC profile.\n");
talloc_free(tmp);
return lut;
}
#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},
};
bool mp_icc_set_profile(struct mp_icc_opts *opts, char *profile)
{
return false;
}
struct lut3d *mp_load_icc(struct mp_icc_opts *opts, struct mp_log *log,
struct mpv_global *global)
{
mp_msg(log, MSGL_FATAL, "LCMS2 support not compiled.\n");
return NULL;
}
#endif
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