aboutsummaryrefslogtreecommitdiffhomepage
path: root/sub/ass_mp.c
blob: 34e05a230c4e9068c7e237f6e7b1506fa001f0bc (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
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
/*
 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
 *
 * 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 <inttypes.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <assert.h>

#include <ass/ass.h>
#include <ass/ass_types.h>

#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
#include "options/path.h"
#include "ass_mp.h"
#include "img_convert.h"
#include "osd.h"
#include "stream/stream.h"
#include "options/options.h"
#include "video/out/bitmap_packer.h"
#include "video/mp_image.h"

// res_y should be track->PlayResY
// It determines scaling of font sizes and more.
void mp_ass_set_style(ASS_Style *style, double res_y,
                      const struct osd_style_opts *opts)
{
    if (!style)
        return;

    if (opts->font) {
        if (!style->FontName || strcmp(style->FontName, opts->font) != 0) {
            free(style->FontName);
            style->FontName = strdup(opts->font);
        }
    }

    // libass_font_size = FontSize * (window_height / res_y)
    // scale translates parameters from PlayResY=720 to res_y
    double scale = res_y / 720.0;

    style->FontSize = opts->font_size * scale;
    style->PrimaryColour = MP_ASS_COLOR(opts->color);
    style->SecondaryColour = style->PrimaryColour;
    style->OutlineColour = MP_ASS_COLOR(opts->border_color);
    if (opts->back_color.a) {
        style->BackColour = MP_ASS_COLOR(opts->back_color);
        style->BorderStyle = 4; // opaque box
    } else {
        style->BackColour = MP_ASS_COLOR(opts->shadow_color);
        style->BorderStyle = 1; // outline
    }
    style->Outline = opts->border_size * scale;
    style->Shadow = opts->shadow_offset * scale;
    style->Spacing = opts->spacing * scale;
    style->MarginL = opts->margin_x * scale;
    style->MarginR = style->MarginL;
    style->MarginV = opts->margin_y * scale;
    style->ScaleX = 1.;
    style->ScaleY = 1.;
    style->Alignment = 1 + (opts->align_x + 1) + (opts->align_y + 2) % 3 * 4;
#ifdef ASS_JUSTIFY_LEFT
    style->Justify = opts->justify;
#endif
    style->Blur = opts->blur;
    style->Bold = opts->bold;
    style->Italic = opts->italic;
}

void mp_ass_configure_fonts(ASS_Renderer *priv, struct osd_style_opts *opts,
                            struct mpv_global *global, struct mp_log *log)
{
    void *tmp = talloc_new(NULL);
    char *default_font = mp_find_config_file(tmp, global, "subfont.ttf");
    char *config       = mp_find_config_file(tmp, global, "fonts.conf");

    if (default_font && !mp_path_exists(default_font))
        default_font = NULL;

    mp_verbose(log, "Setting up fonts...\n");
    ass_set_fonts(priv, default_font, opts->font, 1, config, 1);
    mp_verbose(log, "Done.\n");

    talloc_free(tmp);
}

static const int map_ass_level[] = {
    MSGL_ERR,           // 0 "FATAL errors"
    MSGL_WARN,
    MSGL_INFO,
    MSGL_V,
    MSGL_V,
    MSGL_DEBUG,         // 5 application recommended level
    MSGL_TRACE,
    MSGL_TRACE,         // 7 "verbose DEBUG"
};

static void message_callback(int level, const char *format, va_list va, void *ctx)
{
    struct mp_log *log = ctx;
    if (!log)
        return;
    level = map_ass_level[level];
    mp_msg_va(log, level, format, va);
    // libass messages lack trailing \n
    mp_msg(log, level, "\n");
}

ASS_Library *mp_ass_init(struct mpv_global *global, struct mp_log *log)
{
    char *path = mp_find_config_file(NULL, global, "fonts");
    ASS_Library *priv = ass_library_init();
    if (!priv)
        abort();
    ass_set_message_cb(priv, message_callback, log);
    if (path)
        ass_set_fonts_dir(priv, path);
    talloc_free(path);
    return priv;
}

void mp_ass_flush_old_events(ASS_Track *track, long long ts)
{
    int n = 0;
    for (; n < track->n_events; n++) {
        if ((track->events[n].Start + track->events[n].Duration) >= ts)
            break;
        ass_free_event(track, n);
        track->n_events--;
    }
    for (int i = 0; n > 0 && i < track->n_events; i++) {
        track->events[i] = track->events[i+n];
    }
}

static void draw_ass_rgba(unsigned char *src, int src_w, int src_h,
                          int src_stride, unsigned char *dst, size_t dst_stride,
                          int dst_x, int dst_y, uint32_t color)
{
    const unsigned int r = (color >> 24) & 0xff;
    const unsigned int g = (color >> 16) & 0xff;
    const unsigned int b = (color >>  8) & 0xff;
    const unsigned int a = 0xff - (color & 0xff);

    dst += dst_y * dst_stride + dst_x * 4;

    for (int y = 0; y < src_h; y++, dst += dst_stride, src += src_stride) {
        uint32_t *dstrow = (uint32_t *) dst;
        for (int x = 0; x < src_w; x++) {
            const unsigned int v = src[x];
            int rr = (r * a * v);
            int gg = (g * a * v);
            int bb = (b * a * v);
            int aa =      a * v;
            uint32_t dstpix = dstrow[x];
            unsigned int dstb =  dstpix        & 0xFF;
            unsigned int dstg = (dstpix >>  8) & 0xFF;
            unsigned int dstr = (dstpix >> 16) & 0xFF;
            unsigned int dsta = (dstpix >> 24) & 0xFF;
            dstb = (bb       + dstb * (255 * 255 - aa)) / (255 * 255);
            dstg = (gg       + dstg * (255 * 255 - aa)) / (255 * 255);
            dstr = (rr       + dstr * (255 * 255 - aa)) / (255 * 255);
            dsta = (aa * 255 + dsta * (255 * 255 - aa)) / (255 * 255);
            dstrow[x] = dstb | (dstg << 8) | (dstr << 16) | (dsta << 24);
        }
    }
}

struct mp_ass_packer {
    struct sub_bitmap *cached_parts; // only for the array memory
    struct mp_image *cached_img;
    struct sub_bitmaps cached_subs;
    bool cached_subs_valid;
    struct sub_bitmap rgba_imgs[MP_SUB_BB_LIST_MAX];
    struct bitmap_packer *packer;
};

// Free with talloc_free().
struct mp_ass_packer *mp_ass_packer_alloc(void *ta_parent)
{
    struct mp_ass_packer *p = talloc_zero(ta_parent, struct mp_ass_packer);
    p->packer = talloc_zero(p, struct bitmap_packer);
    return p;
}

static bool pack(struct mp_ass_packer *p, struct sub_bitmaps *res, int imgfmt)
{
    packer_set_size(p->packer, res->num_parts);

    for (int n = 0; n < res->num_parts; n++)
        p->packer->in[n] = (struct pos){res->parts[n].w, res->parts[n].h};

    if (p->packer->count == 0 || packer_pack(p->packer) < 0)
        return false;

    struct pos bb[2];
    packer_get_bb(p->packer, bb);

    res->packed_w = bb[1].x;
    res->packed_h = bb[1].y;

    if (!p->cached_img || p->cached_img->w < res->packed_w ||
                          p->cached_img->h < res->packed_h ||
                          p->cached_img->imgfmt != imgfmt)
    {
        talloc_free(p->cached_img);
        p->cached_img = mp_image_alloc(imgfmt, p->packer->w, p->packer->h);
        if (!p->cached_img)
            return false;
        talloc_steal(p, p->cached_img);
    }

    res->packed = p->cached_img;

    for (int n = 0; n < res->num_parts; n++) {
        struct sub_bitmap *b = &res->parts[n];
        struct pos pos = p->packer->result[n];

        b->src_x = pos.x;
        b->src_y = pos.y;
    }

    return true;
}

static bool pack_libass(struct mp_ass_packer *p, struct sub_bitmaps *res)
{
    if (!pack(p, res, IMGFMT_Y8))
        return false;

    for (int n = 0; n < res->num_parts; n++) {
        struct sub_bitmap *b = &res->parts[n];

        int stride = res->packed->stride[0];
        void *pdata =
            (uint8_t *)res->packed->planes[0] + b->src_y * stride + b->src_x;
        memcpy_pic(pdata, b->bitmap, b->w, b->h, stride, b->stride);

        b->bitmap = pdata;
        b->stride = stride;
    }

    return true;
}

static bool pack_rgba(struct mp_ass_packer *p, struct sub_bitmaps *res)
{
    struct mp_rect bb_list[MP_SUB_BB_LIST_MAX];
    int num_bb = mp_get_sub_bb_list(res, bb_list, MP_SUB_BB_LIST_MAX);

    struct sub_bitmaps imgs = {
        .change_id = res->change_id,
        .format = SUBBITMAP_RGBA,
        .parts = p->rgba_imgs,
        .num_parts = num_bb,
    };

    for (int n = 0; n < imgs.num_parts; n++) {
        imgs.parts[n].w = bb_list[n].x1 - bb_list[n].x0;
        imgs.parts[n].h = bb_list[n].y1 - bb_list[n].y0;
    }

    if (!pack(p, &imgs, IMGFMT_BGRA))
        return false;

    for (int n = 0; n < num_bb; n++) {
        struct mp_rect bb = bb_list[n];
        struct sub_bitmap *b = &imgs.parts[n];

        b->x = bb.x0;
        b->y = bb.y0;
        b->w = b->dw = bb.x1 - bb.x0;
        b->h = b->dh = bb.y1 - bb.y0;
        b->stride = imgs.packed->stride[0];
        b->bitmap = (uint8_t *)imgs.packed->planes[0] +
                    b->stride * b->src_y + b->src_x * 4;

        memset_pic(b->bitmap, 0, b->w * 4, b->h, b->stride);

        for (int i = 0; i < res->num_parts; i++) {
            struct sub_bitmap *s = &res->parts[i];

            // Assume mp_get_sub_bb_list() never splits sub bitmaps
            // So we don't clip/adjust the size of the sub bitmap
            if (s->x > bb.x1 || s->x + s->w < bb.x0 ||
                s->y > bb.y1 || s->y + s->h < bb.y0)
                continue;

            draw_ass_rgba(s->bitmap, s->w, s->h, s->stride,
                          b->bitmap, b->stride,
                          s->x - bb.x0, s->y - bb.y0,
                          s->libass.color);
        }
    }

    *res = imgs;
    return true;
}

// Pack the contents of image_lists[0] to image_lists[num_image_lists-1] into
// a single image, and make *out point to it. *out is completely overwritten.
// If libass reported any change, image_lists_changed must be set (it then
// repacks all images). preferred_osd_format can be set to a desired
// sub_bitmap_format. Currently, only SUBBITMAP_LIBASS is supported.
void mp_ass_packer_pack(struct mp_ass_packer *p, ASS_Image **image_lists,
                        int num_image_lists, bool image_lists_changed,
                        int preferred_osd_format, struct sub_bitmaps *out)
{
    int format = preferred_osd_format == SUBBITMAP_RGBA ? SUBBITMAP_RGBA
                                                        : SUBBITMAP_LIBASS;

    if (p->cached_subs_valid && !image_lists_changed &&
        p->cached_subs.format == format)
    {
        *out = p->cached_subs;
        return;
    }

    *out = (struct sub_bitmaps){.change_id = 1};
    p->cached_subs_valid = false;

    struct sub_bitmaps res = {
        .change_id = image_lists_changed,
        .format = SUBBITMAP_LIBASS,
        .parts = p->cached_parts,
    };

    for (int n = 0; n < num_image_lists; n++) {
        for (struct ass_image *img = image_lists[n]; img; img = img->next) {
            if (img->w == 0 || img->h == 0)
                continue;
            MP_TARRAY_GROW(p, p->cached_parts, res.num_parts);
            res.parts = p->cached_parts;
            struct sub_bitmap *b = &res.parts[res.num_parts];
            b->bitmap = img->bitmap;
            b->stride = img->stride;
            b->libass.color = img->color;
            b->dw = b->w = img->w;
            b->dh = b->h = img->h;
            b->x = img->dst_x;
            b->y = img->dst_y;
            res.num_parts++;
        }
    }

    bool r = false;
    if (format == SUBBITMAP_RGBA) {
        r = pack_rgba(p, &res);
    } else {
        r = pack_libass(p, &res);
    }

    if (!r)
        return;

    *out = res;
    p->cached_subs = res;
    p->cached_subs.change_id = 0;
    p->cached_subs_valid = true;
}