FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/dvdsubenc.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 211 263 80.2%
Branches: 132 170 77.6%

Line Branch Exec Source
1 /*
2 * DVD subtitle encoding
3 * Copyright (c) 2005 Wolfram Gloger
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21 #include "avcodec.h"
22 #include "bytestream.h"
23 #include "internal.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/opt.h"
28
29 typedef struct {
30 AVClass *class;
31 uint32_t global_palette[16];
32 char *palette_str;
33 int even_rows_fix;
34 } DVDSubtitleContext;
35
36 // ncnt is the nibble counter
37 #define PUTNIBBLE(val)\
38 do {\
39 if (ncnt++ & 1)\
40 *q++ = bitbuf | ((val) & 0x0f);\
41 else\
42 bitbuf = (val) << 4;\
43 } while(0)
44
45 86 static void dvd_encode_rle(uint8_t **pq,
46 const uint8_t *bitmap, int linesize,
47 int w, int h,
48 const int cmap[256])
49 {
50 uint8_t *q;
51 86 unsigned int bitbuf = 0;
52 int ncnt;
53 int x, y, len, color;
54
55 86 q = *pq;
56
57
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1649 for (y = 0; y < h; ++y) {
58 1563 ncnt = 0;
59
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119769 for(x = 0; x < w; x += len) {
60 118206 color = bitmap[x];
61
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473056 for (len=1; x+len < w; ++len)
62
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471493 if (bitmap[x+len] != color)
63 116643 break;
64 118206 color = cmap[color];
65
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118206 av_assert0(color < 4);
66
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118206 if (len < 0x04) {
67
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94474 PUTNIBBLE((len << 2)|color);
68
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23732 } else if (len < 0x10) {
69
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21030 PUTNIBBLE(len >> 2);
70
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21030 PUTNIBBLE((len << 2)|color);
71
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2702 } else if (len < 0x40) {
72
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1843 PUTNIBBLE(0);
73
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1843 PUTNIBBLE(len >> 2);
74
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1843 PUTNIBBLE((len << 2)|color);
75
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859 } else if (x+len == w) {
76
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321 PUTNIBBLE(0);
77
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321 PUTNIBBLE(0);
78
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321 PUTNIBBLE(0);
79
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321 PUTNIBBLE(color);
80 } else {
81
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538 if (len > 0xff)
82 26 len = 0xff;
83
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538 PUTNIBBLE(0);
84
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538 PUTNIBBLE(len >> 6);
85
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538 PUTNIBBLE(len >> 2);
86
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538 PUTNIBBLE((len << 2)|color);
87 }
88 }
89 /* end of line */
90
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1563 if (ncnt & 1)
91
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739 PUTNIBBLE(0);
92 1563 bitmap += linesize;
93 }
94
95 86 *pq = q;
96 86 }
97
98 45795 static int color_distance(uint32_t a, uint32_t b)
99 {
100 45795 int r = 0, d, i;
101 45795 int alpha_a = 8, alpha_b = 8;
102
103
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228975 for (i = 24; i >= 0; i -= 8) {
104 183180 d = alpha_a * (int)((a >> i) & 0xFF) -
105 183180 alpha_b * (int)((b >> i) & 0xFF);
106 183180 r += d * d;
107 183180 alpha_a = a >> 28;
108 183180 alpha_b = b >> 28;
109 }
110 45795 return r;
111 }
112
113 /**
114 * Count colors used in a rectangle, quantizing alpha and grouping by
115 * nearest global palette entry.
116 */
117 43 static void count_colors(AVCodecContext *avctx, unsigned hits[33],
118 const AVSubtitleRect *r)
119 {
120 43 DVDSubtitleContext *dvdc = avctx->priv_data;
121 43 unsigned count[256] = { 0 };
122 43 uint32_t *palette = (uint32_t *)r->data[1];
123 uint32_t color;
124 43 int x, y, i, j, match, d, best_d, av_uninit(best_j);
125 43 uint8_t *p = r->data[0];
126
127
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1606 for (y = 0; y < r->h; y++) {
128
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473710 for (x = 0; x < r->w; x++)
129 472147 count[*(p++)]++;
130 1563 p += r->linesize[0] - r->w;
131 }
132
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11051 for (i = 0; i < 256; i++) {
133
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11008 if (!count[i]) /* avoid useless search */
134 10836 continue;
135 172 color = palette[i];
136 /* 0: transparent, 1-16: semi-transparent, 17-33 opaque */
137
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172 match = color < 0x33000000 ? 0 : color < 0xCC000000 ? 1 : 17;
138
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172 if (match) {
139 86 best_d = INT_MAX;
140
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1462 for (j = 0; j < 16; j++) {
141 1376 d = color_distance(0xFF000000 | color,
142 1376 0xFF000000 | dvdc->global_palette[j]);
143
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1376 if (d < best_d) {
144 172 best_d = d;
145 172 best_j = j;
146 }
147 }
148 86 match += best_j;
149 }
150 172 hits[match] += count[i];
151 }
152 43 }
153
154 43 static void select_palette(AVCodecContext *avctx, int out_palette[4],
155 int out_alpha[4], unsigned hits[33])
156 {
157 43 DVDSubtitleContext *dvdc = avctx->priv_data;
158 int i, j, bright, mult;
159 uint32_t color;
160 43 int selected[4] = { 0 };
161 43 uint32_t pseudopal[33] = { 0 };
162 43 uint32_t refcolor[3] = { 0x00000000, 0xFFFFFFFF, 0xFF000000 };
163
164 /* Bonus for transparent: if the rectangle fits tightly the text, the
165 background color can be quite rare, but it would be ugly without it */
166 43 hits[0] *= 16;
167 /* Bonus for bright colors */
168
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731 for (i = 0; i < 16; i++) {
169
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688 if (!(hits[1 + i] + hits[17 + i]))
170 602 continue; /* skip unused colors to gain time */
171 86 color = dvdc->global_palette[i];
172 86 bright = 0;
173
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344 for (j = 0; j < 3; j++, color >>= 8)
174
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258 bright += (color & 0xFF) < 0x40 || (color & 0xFF) >= 0xC0;
175 86 mult = 2 + FFMIN(bright, 2);
176 86 hits[ 1 + i] *= mult;
177 86 hits[17 + i] *= mult;
178 }
179
180 /* Select four most frequent colors */
181
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215 for (i = 0; i < 4; i++) {
182
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5848 for (j = 0; j < 33; j++)
183
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5676 if (hits[j] > hits[selected[i]])
184 129 selected[i] = j;
185 172 hits[selected[i]] = 0;
186 }
187
188 /* Order the colors like in most DVDs:
189 0: background, 1: foreground, 2: outline */
190
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731 for (i = 0; i < 16; i++) {
191 688 pseudopal[ 1 + i] = 0x80000000 | dvdc->global_palette[i];
192 688 pseudopal[17 + i] = 0xFF000000 | dvdc->global_palette[i];
193 }
194
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172 for (i = 0; i < 3; i++) {
195 129 int best_d = color_distance(refcolor[i], pseudopal[selected[i]]);
196
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387 for (j = i + 1; j < 4; j++) {
197 258 int d = color_distance(refcolor[i], pseudopal[selected[j]]);
198
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258 if (d < best_d) {
199 FFSWAP(int, selected[i], selected[j]);
200 best_d = d;
201 }
202 }
203 }
204
205 /* Output */
206
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215 for (i = 0; i < 4; i++) {
207
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172 out_palette[i] = selected[i] ? (selected[i] - 1) & 0xF : 0;
208
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172 out_alpha [i] = !selected[i] ? 0 : selected[i] < 17 ? 0x80 : 0xFF;
209 }
210 43 }
211
212 43 static void build_color_map(AVCodecContext *avctx, int cmap[],
213 const uint32_t palette[],
214 const int out_palette[], unsigned int const out_alpha[])
215 {
216 43 DVDSubtitleContext *dvdc = avctx->priv_data;
217 int i, j, d, best_d;
218 uint32_t pseudopal[4];
219
220
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215 for (i = 0; i < 4; i++)
221 172 pseudopal[i] = (out_alpha[i] << 24) |
222 172 dvdc->global_palette[out_palette[i]];
223
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11051 for (i = 0; i < 256; i++) {
224 11008 best_d = INT_MAX;
225
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55040 for (j = 0; j < 4; j++) {
226 44032 d = color_distance(pseudopal[j], palette[i]);
227
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44032 if (d < best_d) {
228 11094 cmap[i] = j;
229 11094 best_d = d;
230 }
231 }
232 }
233 43 }
234
235 static void copy_rectangle(AVSubtitleRect *dst, AVSubtitleRect *src, int cmap[])
236 {
237 int x, y;
238 uint8_t *p, *q;
239
240 p = src->data[0];
241 q = dst->data[0] + (src->x - dst->x) +
242 (src->y - dst->y) * dst->linesize[0];
243 for (y = 0; y < src->h; y++) {
244 for (x = 0; x < src->w; x++)
245 *(q++) = cmap[*(p++)];
246 p += src->linesize[0] - src->w;
247 q += dst->linesize[0] - src->w;
248 }
249 }
250
251 43 static int encode_dvd_subtitles(AVCodecContext *avctx,
252 uint8_t *outbuf, int outbuf_size,
253 const AVSubtitle *h)
254 {
255 43 DVDSubtitleContext *dvdc = avctx->priv_data;
256 uint8_t *q, *qq;
257 int offset1, offset2;
258 43 int i, rects = h->num_rects, ret;
259 43 unsigned global_palette_hits[33] = { 0 };
260 int cmap[256];
261 int out_palette[4];
262 int out_alpha[4];
263 AVSubtitleRect vrect;
264 43 uint8_t *vrect_data = NULL;
265 int x2, y2;
266 43 int forced = 0;
267
268
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43 if (rects == 0 || !h->rects)
269 return AVERROR(EINVAL);
270
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86 for (i = 0; i < rects; i++)
271
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43 if (h->rects[i]->type != SUBTITLE_BITMAP) {
272 av_log(avctx, AV_LOG_ERROR, "Bitmap subtitle required\n");
273 return AVERROR(EINVAL);
274 }
275 /* Mark this subtitle forced if any of the rectangles is forced. */
276
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86 for (i = 0; i < rects; i++)
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43 if ((h->rects[i]->flags & AV_SUBTITLE_FLAG_FORCED) != 0) {
278 forced = 1;
279 break;
280 }
281
282 43 vrect = *h->rects[0];
283
284
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43 if (rects > 1) {
285 /* DVD subtitles can have only one rectangle: build a virtual
286 rectangle containing all actual rectangles.
287 The data of the rectangles will be copied later, when the palette
288 is decided, because the rectangles may have different palettes. */
289 int xmin = h->rects[0]->x, xmax = xmin + h->rects[0]->w;
290 int ymin = h->rects[0]->y, ymax = ymin + h->rects[0]->h;
291 for (i = 1; i < rects; i++) {
292 xmin = FFMIN(xmin, h->rects[i]->x);
293 ymin = FFMIN(ymin, h->rects[i]->y);
294 xmax = FFMAX(xmax, h->rects[i]->x + h->rects[i]->w);
295 ymax = FFMAX(ymax, h->rects[i]->y + h->rects[i]->h);
296 }
297 vrect.x = xmin;
298 vrect.y = ymin;
299 vrect.w = xmax - xmin;
300 vrect.h = ymax - ymin;
301 if ((ret = av_image_check_size(vrect.w, vrect.h, 0, avctx)) < 0)
302 return ret;
303
304 /* Count pixels outside the virtual rectangle as transparent */
305 global_palette_hits[0] = vrect.w * vrect.h;
306 for (i = 0; i < rects; i++)
307 global_palette_hits[0] -= h->rects[i]->w * h->rects[i]->h;
308 }
309
310
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86 for (i = 0; i < rects; i++)
311 43 count_colors(avctx, global_palette_hits, h->rects[i]);
312 43 select_palette(avctx, out_palette, out_alpha, global_palette_hits);
313
314
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43 if (rects > 1) {
315 if (!(vrect_data = av_calloc(vrect.w, vrect.h)))
316 return AVERROR(ENOMEM);
317 vrect.data [0] = vrect_data;
318 vrect.linesize[0] = vrect.w;
319 for (i = 0; i < rects; i++) {
320 build_color_map(avctx, cmap, (uint32_t *)h->rects[i]->data[1],
321 out_palette, out_alpha);
322 copy_rectangle(&vrect, h->rects[i], cmap);
323 }
324 for (i = 0; i < 4; i++)
325 cmap[i] = i;
326 } else {
327 43 build_color_map(avctx, cmap, (uint32_t *)h->rects[0]->data[1],
328 out_palette, out_alpha);
329 }
330
331 43 av_log(avctx, AV_LOG_DEBUG, "Selected palette:");
332
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215 for (i = 0; i < 4; i++)
333 172 av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32"@@%02x (0x%x,0x%x)",
334 172 dvdc->global_palette[out_palette[i]], out_alpha[i],
335 172 out_palette[i], out_alpha[i] >> 4);
336 43 av_log(avctx, AV_LOG_DEBUG, "\n");
337
338 // encode data block
339 43 q = outbuf + 4;
340 43 offset1 = q - outbuf;
341 // worst case memory requirement: 1 nibble per pixel..
342
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43 if ((q - outbuf) + vrect.w * vrect.h / 2 + 17 + 21 > outbuf_size) {
343 av_log(NULL, AV_LOG_ERROR, "dvd_subtitle too big\n");
344 ret = AVERROR_BUFFER_TOO_SMALL;
345 goto fail;
346 }
347 43 dvd_encode_rle(&q, vrect.data[0], vrect.w * 2,
348 43 vrect.w, (vrect.h + 1) >> 1, cmap);
349 43 offset2 = q - outbuf;
350 43 dvd_encode_rle(&q, vrect.data[0] + vrect.w, vrect.w * 2,
351 43 vrect.w, vrect.h >> 1, cmap);
352
353
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43 if (dvdc->even_rows_fix && (vrect.h & 1)) {
354 // Work-around for some players that want the height to be even.
355 vrect.h++;
356 *q++ = 0x00; // 0x00 0x00 == empty row, i.e. fully transparent
357 *q++ = 0x00;
358 }
359
360 // set data packet size
361 43 qq = outbuf + 2;
362 43 bytestream_put_be16(&qq, q - outbuf);
363
364 // send start display command
365 43 bytestream_put_be16(&q, (h->start_display_time*90) >> 10);
366 43 bytestream_put_be16(&q, (q - outbuf) /*- 2 */ + 8 + 12 + 2);
367 43 *q++ = 0x03; // palette - 4 nibbles
368 43 *q++ = (out_palette[3] << 4) | out_palette[2];
369 43 *q++ = (out_palette[1] << 4) | out_palette[0];
370 43 *q++ = 0x04; // alpha - 4 nibbles
371 43 *q++ = (out_alpha[3] & 0xF0) | (out_alpha[2] >> 4);
372 43 *q++ = (out_alpha[1] & 0xF0) | (out_alpha[0] >> 4);
373
374 // 12 bytes per rect
375 43 x2 = vrect.x + vrect.w - 1;
376 43 y2 = vrect.y + vrect.h - 1;
377
378 43 *q++ = 0x05;
379 // x1 x2 -> 6 nibbles
380 43 *q++ = vrect.x >> 4;
381 43 *q++ = (vrect.x << 4) | ((x2 >> 8) & 0xf);
382 43 *q++ = x2;
383 // y1 y2 -> 6 nibbles
384 43 *q++ = vrect.y >> 4;
385 43 *q++ = (vrect.y << 4) | ((y2 >> 8) & 0xf);
386 43 *q++ = y2;
387
388 43 *q++ = 0x06;
389 // offset1, offset2
390 43 bytestream_put_be16(&q, offset1);
391 43 bytestream_put_be16(&q, offset2);
392
393 43 *q++ = forced ? 0x00 : 0x01; // start command
394 43 *q++ = 0xff; // terminating command
395
396 // send stop display command last
397 43 bytestream_put_be16(&q, (h->end_display_time*90) >> 10);
398 43 bytestream_put_be16(&q, (q - outbuf) - 2 /*+ 4*/);
399 43 *q++ = 0x02; // set end
400 43 *q++ = 0xff; // terminating command
401
402 43 qq = outbuf;
403 43 bytestream_put_be16(&qq, q - outbuf);
404
405 43 av_log(NULL, AV_LOG_DEBUG, "subtitle_packet size=%"PTRDIFF_SPECIFIER"\n", q - outbuf);
406 43 ret = q - outbuf;
407
408 43 fail:
409 43 av_free(vrect_data);
410 43 return ret;
411 }
412
413 1 static int bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf)
414 {
415 int ret;
416 char *str;
417
418 1 ret = av_bprint_finalize(buf, &str);
419
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1 if (ret < 0)
420 return ret;
421
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1 if (!av_bprint_is_complete(buf)) {
422 av_free(str);
423 return AVERROR(ENOMEM);
424 }
425
426 1 avctx->extradata = str;
427 /* Note: the string is NUL terminated (so extradata can be read as a
428 * string), but the ending character is not accounted in the size (in
429 * binary formats you are likely not supposed to mux that character). When
430 * extradata is copied, it is also padded with AV_INPUT_BUFFER_PADDING_SIZE
431 * zeros. */
432 1 avctx->extradata_size = buf->len;
433 1 return 0;
434 }
435
436 1 static int dvdsub_init(AVCodecContext *avctx)
437 {
438 1 DVDSubtitleContext *dvdc = avctx->priv_data;
439 static const uint32_t default_palette[16] = {
440 0x000000, 0x0000FF, 0x00FF00, 0xFF0000,
441 0xFFFF00, 0xFF00FF, 0x00FFFF, 0xFFFFFF,
442 0x808000, 0x8080FF, 0x800080, 0x80FF80,
443 0x008080, 0xFF8080, 0x555555, 0xAAAAAA,
444 };
445 AVBPrint extradata;
446 int i, ret;
447
448 av_assert0(sizeof(dvdc->global_palette) == sizeof(default_palette));
449
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1 if (dvdc->palette_str) {
450 ff_dvdsub_parse_palette(dvdc->global_palette, dvdc->palette_str);
451 } else {
452 1 memcpy(dvdc->global_palette, default_palette, sizeof(dvdc->global_palette));
453 }
454
455 1 av_bprint_init(&extradata, 0, AV_BPRINT_SIZE_AUTOMATIC);
456
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1 if (avctx->width && avctx->height)
457 1 av_bprintf(&extradata, "size: %dx%d\n", avctx->width, avctx->height);
458 1 av_bprintf(&extradata, "palette:");
459
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17 for (i = 0; i < 16; i++)
460
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16 av_bprintf(&extradata, " %06"PRIx32"%c",
461 16 dvdc->global_palette[i] & 0xFFFFFF, i < 15 ? ',' : '\n');
462
463 1 ret = bprint_to_extradata(avctx, &extradata);
464
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1 if (ret < 0)
465 return ret;
466
467 1 return 0;
468 }
469
470 43 static int dvdsub_encode(AVCodecContext *avctx,
471 unsigned char *buf, int buf_size,
472 const AVSubtitle *sub)
473 {
474 //DVDSubtitleContext *s = avctx->priv_data;
475 int ret;
476
477 43 ret = encode_dvd_subtitles(avctx, buf, buf_size, sub);
478 43 return ret;
479 }
480
481 #define OFFSET(x) offsetof(DVDSubtitleContext, x)
482 #define SE AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_ENCODING_PARAM
483 static const AVOption options[] = {
484 {"palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SE },
485 {"even_rows_fix", "Make number of rows even (workaround for some players)", OFFSET(even_rows_fix), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SE},
486 { NULL },
487 };
488
489 static const AVClass dvdsubenc_class = {
490 .class_name = "VOBSUB subtitle encoder",
491 .item_name = av_default_item_name,
492 .option = options,
493 .version = LIBAVUTIL_VERSION_INT,
494 };
495
496 const AVCodec ff_dvdsub_encoder = {
497 .name = "dvdsub",
498 .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
499 .type = AVMEDIA_TYPE_SUBTITLE,
500 .id = AV_CODEC_ID_DVD_SUBTITLE,
501 .init = dvdsub_init,
502 .encode_sub = dvdsub_encode,
503 .priv_class = &dvdsubenc_class,
504 .priv_data_size = sizeof(DVDSubtitleContext),
505 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
506 };
507