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mpv/video/out/gpu/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 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.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <math.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/csputils.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;
struct AVBufferRef *vid_profile;
char *current_profile;
bool using_memory_profile;
bool changed;
enum mp_csp_prim current_prim;
enum mp_csp_trc current_trc;
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)
return false;
}
return true;
}
static int validate_3dlut_size_opt(struct mp_log *log, const m_option_t *opt,
struct bstr name, const char **value)
{
struct bstr param = bstr0(*value);
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[]) {
{"use-embedded-icc-profile", OPT_FLAG(use_embedded)},
{"icc-profile", OPT_STRING(profile), .flags = M_OPT_FILE},
{"icc-profile-auto", OPT_FLAG(profile_auto)},
{"icc-cache-dir", OPT_STRING(cache_dir), .flags = M_OPT_FILE},
{"icc-intent", OPT_INT(intent)},
{"icc-contrast", OPT_CHOICE(contrast, {"inf", -1}),
M_RANGE(0, 1000000)},
{"icc-3dlut-size", OPT_STRING_VALIDATE(size_str, validate_3dlut_size_opt)},
{"3dlut-size", OPT_REPLACED("icc-3dlut-size")},
{"icc-cache", OPT_REMOVED("see icc-cache-dir")},
{0}
},
.size = sizeof(struct mp_icc_opts),
.defaults = &(const struct mp_icc_opts) {
.size_str = "64x64x64",
.intent = INTENT_RELATIVE_COLORIMETRIC,
.use_embedded = true,
},
};
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 void load_profile(struct gl_lcms *p)
{
talloc_free(p->icc_data);
p->icc_data = NULL;
p->icc_size = 0;
p->using_memory_profile = false;
talloc_free(p->current_profile);
p->current_profile = NULL;
if (!p->opts->profile || !p->opts->profile[0])
return;
char *fname = mp_get_user_path(NULL, p->global, p->opts->profile);
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;
talloc_free(p->icc_data);
p->icc_data = iccdata.start;
p->icc_size = iccdata.len;
p->current_profile = talloc_strdup(p, p->opts->profile);
}
static void gl_lcms_destructor(void *ptr)
{
struct gl_lcms *p = ptr;
av_buffer_unref(&p->vid_profile);
}
struct gl_lcms *gl_lcms_init(void *talloc_ctx, struct mp_log *log,
struct mpv_global *global,
struct mp_icc_opts *opts)
{
struct gl_lcms *p = talloc_ptrtype(talloc_ctx, p);
talloc_set_destructor(p, gl_lcms_destructor);
*p = (struct gl_lcms) {
.global = global,
.log = log,
.opts = opts,
};
gl_lcms_update_options(p);
return p;
}
void gl_lcms_update_options(struct gl_lcms *p)
{
if ((p->using_memory_profile && !p->opts->profile_auto) ||
!bstr_equals(bstr0(p->opts->profile), bstr0(p->current_profile)))
{
load_profile(p);
}
p->changed = true; // probably
}
// Warning: profile.start must point to a ta allocation, and the function
// takes over ownership.
// Returns whether the internal profile was changed.
bool gl_lcms_set_memory_profile(struct gl_lcms *p, bstr profile)
{
if (!p->opts->profile_auto || (p->opts->profile && p->opts->profile[0])) {
talloc_free(profile.start);
return false;
}
if (p->using_memory_profile &&
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 false;
}
p->changed = true;
p->using_memory_profile = true;
talloc_free(p->icc_data);
p->icc_data = talloc_steal(p, profile.start);
p->icc_size = profile.len;
return true;
}
// Guards against NULL and uses bstr_equals to short-circuit some special cases
static bool vid_profile_eq(struct AVBufferRef *a, struct AVBufferRef *b)
{
if (!a || !b)
return a == b;
return bstr_equals((struct bstr){ a->data, a->size },
(struct bstr){ b->data, b->size });
}
// Return whether the profile or config has changed since the last time it was
// retrieved. If it has changed, gl_lcms_get_lut3d() should be called.
bool gl_lcms_has_changed(struct gl_lcms *p, enum mp_csp_prim prim,
enum mp_csp_trc trc, struct AVBufferRef *vid_profile)
{
if (p->changed || p->current_prim != prim || p->current_trc != trc)
return true;
return !vid_profile_eq(p->vid_profile, vid_profile);
}
// Whether a profile is set. (gl_lcms_get_lut3d() is expected to return a lut,
// but it could still fail due to runtime errors, such as invalid icc data.)
bool gl_lcms_has_profile(struct gl_lcms *p)
{
return p->icc_size > 0;
}
static cmsHPROFILE get_vid_profile(struct gl_lcms *p, cmsContext cms,
cmsHPROFILE disp_profile,
enum mp_csp_prim prim, enum mp_csp_trc trc)
{
if (p->opts->use_embedded && p->vid_profile) {
// Try using the embedded ICC profile
cmsHPROFILE prof = cmsOpenProfileFromMemTHR(cms, p->vid_profile->data,
p->vid_profile->size);
if (prof) {
MP_VERBOSE(p, "Successfully opened embedded ICC profile\n");
return prof;
}
// Otherwise, warn the user and generate the profile as usual
MP_WARN(p, "Video contained an invalid ICC profile! Ignoring...\n");
}
// The input profile for the transformation is dependent on the video
// primaries and transfer characteristics
struct mp_csp_primaries csp = mp_get_csp_primaries(prim);
cmsCIExyY wp_xyY = {csp.white.x, csp.white.y, 1.0};
cmsCIExyYTRIPLE prim_xyY = {
.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},
};
cmsToneCurve *tonecurve[3] = {0};
switch (trc) {
case MP_CSP_TRC_LINEAR: tonecurve[0] = cmsBuildGamma(cms, 1.0); break;
case MP_CSP_TRC_GAMMA18: tonecurve[0] = cmsBuildGamma(cms, 1.8); break;
case MP_CSP_TRC_GAMMA20: tonecurve[0] = cmsBuildGamma(cms, 2.0); break;
case MP_CSP_TRC_GAMMA22: tonecurve[0] = cmsBuildGamma(cms, 2.2); break;
case MP_CSP_TRC_GAMMA24: tonecurve[0] = cmsBuildGamma(cms, 2.4); break;
case MP_CSP_TRC_GAMMA26: tonecurve[0] = cmsBuildGamma(cms, 2.6); break;
case MP_CSP_TRC_GAMMA28: tonecurve[0] = cmsBuildGamma(cms, 2.8); break;
case MP_CSP_TRC_SRGB:
// Values copied from Little-CMS
tonecurve[0] = cmsBuildParametricToneCurve(cms, 4,
(double[5]){2.40, 1/1.055, 0.055/1.055, 1/12.92, 0.04045});
break;
case MP_CSP_TRC_PRO_PHOTO:
tonecurve[0] = cmsBuildParametricToneCurve(cms, 4,
(double[5]){1.8, 1.0, 0.0, 1/16.0, 0.03125});
break;
case MP_CSP_TRC_BT_1886: {
// To build an appropriate BT.1886 transformation we need access to
// the display's black point, so we LittleCMS' detection function.
// Relative colorimetric is used since we want to approximate the
// BT.1886 to the target device's actual black point even in e.g.
// perceptual mode
const int intent = MP_INTENT_RELATIVE_COLORIMETRIC;
cmsCIEXYZ bp_XYZ;
if (!cmsDetectBlackPoint(&bp_XYZ, disp_profile, intent, 0))
return false;
// Map this XYZ value back into the (linear) source space
cmsToneCurve *linear = cmsBuildGamma(cms, 1.0);
cmsHPROFILE rev_profile = cmsCreateRGBProfileTHR(cms, &wp_xyY, &prim_xyY,
(cmsToneCurve*[3]){linear, linear, linear});
cmsHPROFILE xyz_profile = cmsCreateXYZProfile();
cmsHTRANSFORM xyz2src = cmsCreateTransformTHR(cms,
xyz_profile, TYPE_XYZ_DBL, rev_profile, TYPE_RGB_DBL,
intent, 0);
cmsFreeToneCurve(linear);
cmsCloseProfile(rev_profile);
cmsCloseProfile(xyz_profile);
if (!xyz2src)
return false;
double src_black[3];
cmsDoTransform(xyz2src, &bp_XYZ, src_black, 1);
cmsDeleteTransform(xyz2src);
// Contrast limiting
if (p->opts->contrast > 0) {
for (int i = 0; i < 3; i++)
src_black[i] = MPMAX(src_black[i], 1.0 / p->opts->contrast);
}
// Built-in contrast failsafe
double contrast = 3.0 / (src_black[0] + src_black[1] + src_black[2]);
MP_VERBOSE(p, "Detected ICC profile contrast: %f\n", contrast);
if (contrast > 100000 && !p->opts->contrast) {
MP_WARN(p, "ICC profile detected contrast very high (>100000),"
" falling back to contrast 1000 for sanity. Set the"
" icc-contrast option to silence this warning.\n");
src_black[0] = src_black[1] = src_black[2] = 1.0 / 1000;
}
// Build the parametric BT.1886 transfer curve, one per channel
for (int i = 0; i < 3; i++) {
const double gamma = 2.40;
double binv = pow(src_black[i], 1.0/gamma);
tonecurve[i] = cmsBuildParametricToneCurve(cms, 6,
(double[4]){gamma, 1.0 - binv, binv, 0.0});
}
break;
}
default:
abort();
}
if (!tonecurve[0])
return false;
if (!tonecurve[1]) tonecurve[1] = tonecurve[0];
if (!tonecurve[2]) tonecurve[2] = tonecurve[0];
cmsHPROFILE *vid_profile = cmsCreateRGBProfileTHR(cms, &wp_xyY, &prim_xyY,
tonecurve);
if (tonecurve[2] != tonecurve[0]) cmsFreeToneCurve(tonecurve[2]);
if (tonecurve[1] != tonecurve[0]) cmsFreeToneCurve(tonecurve[1]);
cmsFreeToneCurve(tonecurve[0]);
return vid_profile;
}
bool gl_lcms_get_lut3d(struct gl_lcms *p, struct lut3d **result_lut3d,
enum mp_csp_prim prim, enum mp_csp_trc trc,
struct AVBufferRef *vid_profile)
{
int s_r, s_g, s_b;
bool result = false;
p->changed = false;
p->current_prim = prim;
p->current_trc = trc;
// We need to hold on to a reference to the video's ICC profile for as long
// as we still need to perform equality checking, so generate a new
// reference here
av_buffer_unref(&p->vid_profile);
if (vid_profile) {
MP_VERBOSE(p, "Got an embedded ICC profile.\n");
p->vid_profile = av_buffer_ref(vid_profile);
if (!p->vid_profile)
abort();
}
if (!parse_3dlut_size(p->opts->size_str, &s_r, &s_g, &s_b))
return false;
if (!gl_lcms_has_profile(p))
return false;
void *tmp = talloc_new(NULL);
uint16_t *output = talloc_array(tmp, uint16_t, s_r * s_g * s_b * 4);
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=1.4, intent=%d, size=%dx%dx%d, prim=%d, trc=%d, "
"contrast=%d\n",
p->opts->intent, s_r, s_g, s_b, prim, trc, p->opts->contrast);
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));
if (vid_profile)
av_sha_update(sha, vid_profile->data, vid_profile->size);
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 && stat(cache_file, &(struct stat){0}) == 0) {
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;
cmsHPROFILE vid_hprofile = get_vid_profile(p, cms, profile, prim, trc);
if (!vid_hprofile) {
cmsCloseProfile(profile);
goto error_exit;
}
cmsHTRANSFORM trafo = cmsCreateTransformTHR(cms, vid_hprofile, TYPE_RGB_16,
profile, TYPE_RGBA_16,
p->opts->intent,
cmsFLAGS_HIGHRESPRECALC |
cmsFLAGS_BLACKPOINTCOMPENSATION);
cmsCloseProfile(profile);
cmsCloseProfile(vid_hprofile);
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) * 4;
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,
struct mp_icc_opts *opts)
{
return (struct gl_lcms *) talloc_new(talloc_ctx);
}
void gl_lcms_update_options(struct gl_lcms *p) { }
bool gl_lcms_set_memory_profile(struct gl_lcms *p, bstr profile) {return false;}
bool gl_lcms_has_changed(struct gl_lcms *p, enum mp_csp_prim prim,
enum mp_csp_trc trc, struct AVBufferRef *vid_profile)
{
return false;
}
bool gl_lcms_has_profile(struct gl_lcms *p)
{
return false;
}
bool gl_lcms_get_lut3d(struct gl_lcms *p, struct lut3d **result_lut3d,
enum mp_csp_prim prim, enum mp_csp_trc trc,
struct AVBufferRef *vid_profile)
{
return false;
}
#endif
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