summaryrefslogtreecommitdiffstats
path: root/video/out/gl_lcms.c
blob: ab273ffc0b5e10a254ea63417dbcafce5b7f5d80 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
/*
 * 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>

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", 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 gl_lcms *p = cmsGetContextUserData(ctx);
    MP_ERR(p, "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;
}

static bool load_profile(struct gl_lcms *p)
{
    if (p->icc_data && p->icc_size)
        return true;

    if (!p->icc_path)
        return false;

    MP_INFO(p, "Opening ICC profile '%s'\n", p->icc_path);
    struct bstr iccdata = load_file(p, p->icc_path, p->global);
    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;
}

#define LUT3D_CACHE_HEADER "mpv 3dlut cache 1.0\n"

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_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",
                        p->opts.intent, s_r, s_g, s_b);

    bstr iccdata = (bstr) {
        .start = p->icc_data,
        .len   = p->icc_size,
    };

    // check cache
    if (p->opts.cache) {
        MP_INFO(p, "Opening 3D LUT cache in file '%s'.\n", p->opts.cache);
        struct bstr cachedata = load_file(tmp, p->opts.cache, p->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_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 (p->opts.cache) {
        char *fname = mp_get_user_path(NULL, p->global, p->opts.cache);
        FILE *out = fopen(fname, "wb");
        if (out) {
            fprintf(out, "%s%s", LUT3D_CACHE_HEADER, cache_info);
            fwrite(p->icc_data, p->icc_size, 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},
    };

    *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