FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/dvdsubenc.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 212 267 79.4%
Branches: 134 174 77.0%

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 "codec_internal.h"
24 #include "internal.h"
25 #include "libavutil/avassert.h"
26 #include "libavutil/bprint.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/opt.h"
29
30 typedef struct {
31 AVClass *class;
32 uint32_t global_palette[16];
33 char *palette_str;
34 int even_rows_fix;
35 } DVDSubtitleContext;
36
37 // ncnt is the nibble counter
38 #define PUTNIBBLE(val)\
39 do {\
40 if (ncnt++ & 1)\
41 *q++ = bitbuf | ((val) & 0x0f);\
42 else\
43 bitbuf = (val) << 4;\
44 } while(0)
45
46 86 static void dvd_encode_rle(uint8_t **pq,
47 const uint8_t *bitmap, int linesize,
48 int w, int h,
49 const int cmap[256])
50 {
51 uint8_t *q;
52 86 unsigned int bitbuf = 0;
53 int ncnt;
54 int x, y, len, color;
55
56 86 q = *pq;
57
58
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1649 for (y = 0; y < h; ++y) {
59 1563 ncnt = 0;
60
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119769 for(x = 0; x < w; x += len) {
61 118206 color = bitmap[x];
62
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473056 for (len=1; x+len < w; ++len)
63
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471493 if (bitmap[x+len] != color)
64 116643 break;
65 118206 color = cmap[color];
66
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118206 av_assert0(color < 4);
67
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118206 if (len < 0x04) {
68
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94474 PUTNIBBLE((len << 2)|color);
69
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23732 } else if (len < 0x10) {
70
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21030 PUTNIBBLE(len >> 2);
71
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21030 PUTNIBBLE((len << 2)|color);
72
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2702 } else if (len < 0x40) {
73
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1843 PUTNIBBLE(0);
74
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1843 PUTNIBBLE(len >> 2);
75
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1843 PUTNIBBLE((len << 2)|color);
76
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859 } else if (x+len == w) {
77
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321 PUTNIBBLE(0);
78
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321 PUTNIBBLE(0);
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321 PUTNIBBLE(0);
80
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321 PUTNIBBLE(color);
81 } else {
82
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538 if (len > 0xff)
83 26 len = 0xff;
84
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538 PUTNIBBLE(0);
85
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538 PUTNIBBLE(len >> 6);
86
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538 PUTNIBBLE(len >> 2);
87
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538 PUTNIBBLE((len << 2)|color);
88 }
89 }
90 /* end of line */
91
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1563 if (ncnt & 1)
92
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739 PUTNIBBLE(0);
93 1563 bitmap += linesize;
94 }
95
96 86 *pq = q;
97 86 }
98
99 45795 static int color_distance(uint32_t a, uint32_t b)
100 {
101 45795 int r = 0, d, i;
102 45795 int alpha_a = 8, alpha_b = 8;
103
104
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228975 for (i = 24; i >= 0; i -= 8) {
105 183180 d = alpha_a * (int)((a >> i) & 0xFF) -
106 183180 alpha_b * (int)((b >> i) & 0xFF);
107 183180 r += d * d;
108 183180 alpha_a = a >> 28;
109 183180 alpha_b = b >> 28;
110 }
111 45795 return r;
112 }
113
114 /**
115 * Count colors used in a rectangle, quantizing alpha and grouping by
116 * nearest global palette entry.
117 */
118 43 static void count_colors(AVCodecContext *avctx, unsigned hits[33],
119 const AVSubtitleRect *r)
120 {
121 43 DVDSubtitleContext *dvdc = avctx->priv_data;
122 43 unsigned count[256] = { 0 };
123 43 uint32_t *palette = (uint32_t *)r->data[1];
124 uint32_t color;
125 43 int x, y, i, j, match, d, best_d, av_uninit(best_j);
126 43 uint8_t *p = r->data[0];
127
128
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1606 for (y = 0; y < r->h; y++) {
129
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473710 for (x = 0; x < r->w; x++)
130 472147 count[*(p++)]++;
131 1563 p += r->linesize[0] - r->w;
132 }
133
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11051 for (i = 0; i < 256; i++) {
134
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11008 if (!count[i]) /* avoid useless search */
135 10836 continue;
136 172 color = palette[i];
137 /* 0: transparent, 1-16: semi-transparent, 17-33 opaque */
138
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172 match = color < 0x33000000 ? 0 : color < 0xCC000000 ? 1 : 17;
139
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172 if (match) {
140 86 best_d = INT_MAX;
141
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1462 for (j = 0; j < 16; j++) {
142 1376 d = color_distance(0xFF000000 | color,
143 1376 0xFF000000 | dvdc->global_palette[j]);
144
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1376 if (d < best_d) {
145 172 best_d = d;
146 172 best_j = j;
147 }
148 }
149 86 match += best_j;
150 }
151 172 hits[match] += count[i];
152 }
153 43 }
154
155 43 static void select_palette(AVCodecContext *avctx, int out_palette[4],
156 int out_alpha[4], unsigned hits[33])
157 {
158 43 DVDSubtitleContext *dvdc = avctx->priv_data;
159 int i, j, bright, mult;
160 uint32_t color;
161 43 int selected[4] = { 0 };
162 43 uint32_t pseudopal[33] = { 0 };
163 43 uint32_t refcolor[3] = { 0x00000000, 0xFFFFFFFF, 0xFF000000 };
164
165 /* Bonus for transparent: if the rectangle fits tightly the text, the
166 background color can be quite rare, but it would be ugly without it */
167 43 hits[0] *= 16;
168 /* Bonus for bright colors */
169
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731 for (i = 0; i < 16; i++) {
170
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688 if (!(hits[1 + i] + hits[17 + i]))
171 602 continue; /* skip unused colors to gain time */
172 86 color = dvdc->global_palette[i];
173 86 bright = 0;
174
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344 for (j = 0; j < 3; j++, color >>= 8)
175
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258 bright += (color & 0xFF) < 0x40 || (color & 0xFF) >= 0xC0;
176 86 mult = 2 + FFMIN(bright, 2);
177 86 hits[ 1 + i] *= mult;
178 86 hits[17 + i] *= mult;
179 }
180
181 /* Select four most frequent colors */
182
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215 for (i = 0; i < 4; i++) {
183
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5848 for (j = 0; j < 33; j++)
184
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5676 if (hits[j] > hits[selected[i]])
185 129 selected[i] = j;
186 172 hits[selected[i]] = 0;
187 }
188
189 /* Order the colors like in most DVDs:
190 0: background, 1: foreground, 2: outline */
191
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731 for (i = 0; i < 16; i++) {
192 688 pseudopal[ 1 + i] = 0x80000000 | dvdc->global_palette[i];
193 688 pseudopal[17 + i] = 0xFF000000 | dvdc->global_palette[i];
194 }
195
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172 for (i = 0; i < 3; i++) {
196 129 int best_d = color_distance(refcolor[i], pseudopal[selected[i]]);
197
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387 for (j = i + 1; j < 4; j++) {
198 258 int d = color_distance(refcolor[i], pseudopal[selected[j]]);
199
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258 if (d < best_d) {
200 FFSWAP(int, selected[i], selected[j]);
201 best_d = d;
202 }
203 }
204 }
205
206 /* Output */
207
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215 for (i = 0; i < 4; i++) {
208
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172 out_palette[i] = selected[i] ? (selected[i] - 1) & 0xF : 0;
209
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172 out_alpha [i] = !selected[i] ? 0 : selected[i] < 17 ? 0x80 : 0xFF;
210 }
211 43 }
212
213 43 static void build_color_map(AVCodecContext *avctx, int cmap[],
214 const uint32_t palette[],
215 const int out_palette[], unsigned int const out_alpha[])
216 {
217 43 DVDSubtitleContext *dvdc = avctx->priv_data;
218 int i, j, d, best_d;
219 uint32_t pseudopal[4];
220
221
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215 for (i = 0; i < 4; i++)
222 172 pseudopal[i] = (out_alpha[i] << 24) |
223 172 dvdc->global_palette[out_palette[i]];
224
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11051 for (i = 0; i < 256; i++) {
225 11008 best_d = INT_MAX;
226
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55040 for (j = 0; j < 4; j++) {
227 44032 d = color_distance(pseudopal[j], palette[i]);
228
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44032 if (d < best_d) {
229 11094 cmap[i] = j;
230 11094 best_d = d;
231 }
232 }
233 }
234 43 }
235
236 static void copy_rectangle(AVSubtitleRect *dst, AVSubtitleRect *src, int cmap[])
237 {
238 int x, y;
239 uint8_t *p, *q;
240
241 p = src->data[0];
242 q = dst->data[0] + (src->x - dst->x) +
243 (src->y - dst->y) * dst->linesize[0];
244 for (y = 0; y < src->h; y++) {
245 for (x = 0; x < src->w; x++)
246 *(q++) = cmap[*(p++)];
247 p += src->linesize[0] - src->w;
248 q += dst->linesize[0] - src->w;
249 }
250 }
251
252 43 static int encode_dvd_subtitles(AVCodecContext *avctx,
253 uint8_t *outbuf, int outbuf_size,
254 const AVSubtitle *h)
255 {
256 43 DVDSubtitleContext *dvdc = avctx->priv_data;
257 uint8_t *q, *qq;
258 int offset1, offset2;
259 43 int i, rects = h->num_rects, ret;
260 43 unsigned global_palette_hits[33] = { 0 };
261 int cmap[256];
262 int out_palette[4];
263 int out_alpha[4];
264 AVSubtitleRect vrect;
265 43 uint8_t *vrect_data = NULL;
266 int x2, y2;
267 43 int forced = 0;
268
269
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43 if (rects == 0 || !h->rects)
270 return AVERROR(EINVAL);
271
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86 for (i = 0; i < rects; i++)
272
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43 if (h->rects[i]->type != SUBTITLE_BITMAP) {
273 av_log(avctx, AV_LOG_ERROR, "Bitmap subtitle required\n");
274 return AVERROR(EINVAL);
275 }
276 /* Mark this subtitle forced if any of the rectangles is forced. */
277
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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) {
279 forced = 1;
280 break;
281 }
282
283 43 vrect = *h->rects[0];
284
285
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43 if (rects > 1) {
286 /* DVD subtitles can have only one rectangle: build a virtual
287 rectangle containing all actual rectangles.
288 The data of the rectangles will be copied later, when the palette
289 is decided, because the rectangles may have different palettes. */
290 int xmin = h->rects[0]->x, xmax = xmin + h->rects[0]->w;
291 int ymin = h->rects[0]->y, ymax = ymin + h->rects[0]->h;
292 for (i = 1; i < rects; i++) {
293 xmin = FFMIN(xmin, h->rects[i]->x);
294 ymin = FFMIN(ymin, h->rects[i]->y);
295 xmax = FFMAX(xmax, h->rects[i]->x + h->rects[i]->w);
296 ymax = FFMAX(ymax, h->rects[i]->y + h->rects[i]->h);
297 }
298 vrect.x = xmin;
299 vrect.y = ymin;
300 vrect.w = xmax - xmin;
301 vrect.h = ymax - ymin;
302 if ((ret = av_image_check_size(vrect.w, vrect.h, 0, avctx)) < 0)
303 return ret;
304
305 /* Count pixels outside the virtual rectangle as transparent */
306 global_palette_hits[0] = vrect.w * vrect.h;
307 for (i = 0; i < rects; i++)
308 global_palette_hits[0] -= h->rects[i]->w * h->rects[i]->h;
309 }
310
311
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86 for (i = 0; i < rects; i++)
312 43 count_colors(avctx, global_palette_hits, h->rects[i]);
313 43 select_palette(avctx, out_palette, out_alpha, global_palette_hits);
314
315
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43 if (rects > 1) {
316 if (!(vrect_data = av_calloc(vrect.w, vrect.h)))
317 return AVERROR(ENOMEM);
318 vrect.data [0] = vrect_data;
319 vrect.linesize[0] = vrect.w;
320 for (i = 0; i < rects; i++) {
321 build_color_map(avctx, cmap, (uint32_t *)h->rects[i]->data[1],
322 out_palette, out_alpha);
323 copy_rectangle(&vrect, h->rects[i], cmap);
324 }
325 for (i = 0; i < 4; i++)
326 cmap[i] = i;
327 } else {
328 43 build_color_map(avctx, cmap, (uint32_t *)h->rects[0]->data[1],
329 out_palette, out_alpha);
330 }
331
332 43 av_log(avctx, AV_LOG_DEBUG, "Selected palette:");
333
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215 for (i = 0; i < 4; i++)
334 172 av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32"@@%02x (0x%x,0x%x)",
335 172 dvdc->global_palette[out_palette[i]], out_alpha[i],
336 172 out_palette[i], out_alpha[i] >> 4);
337 43 av_log(avctx, AV_LOG_DEBUG, "\n");
338
339 // encode data block
340 43 q = outbuf + 4;
341 43 offset1 = q - outbuf;
342 // worst case memory requirement: 1 nibble per pixel..
343
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43 if ((q - outbuf) + vrect.w * vrect.h / 2 + 17 + 21 > outbuf_size) {
344 av_log(NULL, AV_LOG_ERROR, "dvd_subtitle too big\n");
345 ret = AVERROR_BUFFER_TOO_SMALL;
346 goto fail;
347 }
348 43 dvd_encode_rle(&q, vrect.data[0], vrect.w * 2,
349 43 vrect.w, (vrect.h + 1) >> 1, cmap);
350 43 offset2 = q - outbuf;
351 43 dvd_encode_rle(&q, vrect.data[0] + vrect.w, vrect.w * 2,
352 43 vrect.w, vrect.h >> 1, cmap);
353
354
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43 if (dvdc->even_rows_fix && (vrect.h & 1)) {
355 // Work-around for some players that want the height to be even.
356 vrect.h++;
357 *q++ = 0x00; // 0x00 0x00 == empty row, i.e. fully transparent
358 *q++ = 0x00;
359 }
360
361 // set data packet size
362 43 qq = outbuf + 2;
363 43 bytestream_put_be16(&qq, q - outbuf);
364
365 // send start display command
366 43 bytestream_put_be16(&q, (h->start_display_time*90) >> 10);
367 43 bytestream_put_be16(&q, (q - outbuf) /*- 2 */ + 8 + 12 + 2);
368 43 *q++ = 0x03; // palette - 4 nibbles
369 43 *q++ = (out_palette[3] << 4) | out_palette[2];
370 43 *q++ = (out_palette[1] << 4) | out_palette[0];
371 43 *q++ = 0x04; // alpha - 4 nibbles
372 43 *q++ = (out_alpha[3] & 0xF0) | (out_alpha[2] >> 4);
373 43 *q++ = (out_alpha[1] & 0xF0) | (out_alpha[0] >> 4);
374
375 // 12 bytes per rect
376 43 x2 = vrect.x + vrect.w - 1;
377 43 y2 = vrect.y + vrect.h - 1;
378
379
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43 if (x2 > avctx->width || y2 > avctx->height) {
380 av_log(avctx, AV_LOG_ERROR, "canvas_size(%d:%d) is too small(%d:%d) for render\n",
381 avctx->width, avctx->height, x2, y2);
382 ret = AVERROR(EINVAL);;
383 goto fail;
384 }
385 43 *q++ = 0x05;
386 // x1 x2 -> 6 nibbles
387 43 *q++ = vrect.x >> 4;
388 43 *q++ = (vrect.x << 4) | ((x2 >> 8) & 0xf);
389 43 *q++ = x2;
390 // y1 y2 -> 6 nibbles
391 43 *q++ = vrect.y >> 4;
392 43 *q++ = (vrect.y << 4) | ((y2 >> 8) & 0xf);
393 43 *q++ = y2;
394
395 43 *q++ = 0x06;
396 // offset1, offset2
397 43 bytestream_put_be16(&q, offset1);
398 43 bytestream_put_be16(&q, offset2);
399
400 43 *q++ = forced ? 0x00 : 0x01; // start command
401 43 *q++ = 0xff; // terminating command
402
403 // send stop display command last
404 43 bytestream_put_be16(&q, (h->end_display_time*90) >> 10);
405 43 bytestream_put_be16(&q, (q - outbuf) - 2 /*+ 4*/);
406 43 *q++ = 0x02; // set end
407 43 *q++ = 0xff; // terminating command
408
409 43 qq = outbuf;
410 43 bytestream_put_be16(&qq, q - outbuf);
411
412 43 av_log(NULL, AV_LOG_DEBUG, "subtitle_packet size=%"PTRDIFF_SPECIFIER"\n", q - outbuf);
413 43 ret = q - outbuf;
414
415 43 fail:
416 43 av_free(vrect_data);
417 43 return ret;
418 }
419
420 1 static int bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf)
421 {
422 int ret;
423 char *str;
424
425 1 ret = av_bprint_finalize(buf, &str);
426
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1 if (ret < 0)
427 return ret;
428
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1 if (!av_bprint_is_complete(buf)) {
429 av_free(str);
430 return AVERROR(ENOMEM);
431 }
432
433 1 avctx->extradata = str;
434 /* Note: the string is NUL terminated (so extradata can be read as a
435 * string), but the ending character is not accounted in the size (in
436 * binary formats you are likely not supposed to mux that character). When
437 * extradata is copied, it is also padded with AV_INPUT_BUFFER_PADDING_SIZE
438 * zeros. */
439 1 avctx->extradata_size = buf->len;
440 1 return 0;
441 }
442
443 1 static int dvdsub_init(AVCodecContext *avctx)
444 {
445 1 DVDSubtitleContext *dvdc = avctx->priv_data;
446 static const uint32_t default_palette[16] = {
447 0x000000, 0x0000FF, 0x00FF00, 0xFF0000,
448 0xFFFF00, 0xFF00FF, 0x00FFFF, 0xFFFFFF,
449 0x808000, 0x8080FF, 0x800080, 0x80FF80,
450 0x008080, 0xFF8080, 0x555555, 0xAAAAAA,
451 };
452 AVBPrint extradata;
453 int i, ret;
454
455 av_assert0(sizeof(dvdc->global_palette) == sizeof(default_palette));
456
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1 if (dvdc->palette_str) {
457 ff_dvdsub_parse_palette(dvdc->global_palette, dvdc->palette_str);
458 } else {
459 1 memcpy(dvdc->global_palette, default_palette, sizeof(dvdc->global_palette));
460 }
461
462 1 av_bprint_init(&extradata, 0, AV_BPRINT_SIZE_AUTOMATIC);
463
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1 if (avctx->width && avctx->height)
464 1 av_bprintf(&extradata, "size: %dx%d\n", avctx->width, avctx->height);
465 1 av_bprintf(&extradata, "palette:");
466
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17 for (i = 0; i < 16; i++)
467
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16 av_bprintf(&extradata, " %06"PRIx32"%c",
468 16 dvdc->global_palette[i] & 0xFFFFFF, i < 15 ? ',' : '\n');
469
470 1 ret = bprint_to_extradata(avctx, &extradata);
471
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1 if (ret < 0)
472 return ret;
473
474 1 return 0;
475 }
476
477 43 static int dvdsub_encode(AVCodecContext *avctx,
478 unsigned char *buf, int buf_size,
479 const AVSubtitle *sub)
480 {
481 //DVDSubtitleContext *s = avctx->priv_data;
482 int ret;
483
484 43 ret = encode_dvd_subtitles(avctx, buf, buf_size, sub);
485 43 return ret;
486 }
487
488 #define OFFSET(x) offsetof(DVDSubtitleContext, x)
489 #define SE AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_ENCODING_PARAM
490 static const AVOption options[] = {
491 {"palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SE },
492 {"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},
493 { NULL },
494 };
495
496 static const AVClass dvdsubenc_class = {
497 .class_name = "VOBSUB subtitle encoder",
498 .item_name = av_default_item_name,
499 .option = options,
500 .version = LIBAVUTIL_VERSION_INT,
501 };
502
503 const FFCodec ff_dvdsub_encoder = {
504 .p.name = "dvdsub",
505 .p.long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
506 .p.type = AVMEDIA_TYPE_SUBTITLE,
507 .p.id = AV_CODEC_ID_DVD_SUBTITLE,
508 .init = dvdsub_init,
509 FF_CODEC_ENCODE_SUB_CB(dvdsub_encode),
510 .p.priv_class = &dvdsubenc_class,
511 .priv_data_size = sizeof(DVDSubtitleContext),
512 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
513 };
514