FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pgssubdec.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 198 272 72.8%
Functions: 11 11 100.0%
Branches: 81 150 54.0%

Line Branch Exec Source
1 /*
2 * PGS subtitle decoder
3 * Copyright (c) 2009 Stephen Backway
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
22 /**
23 * @file
24 * PGS subtitle decoder
25 */
26
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31 #include "mathops.h"
32
33 #include "libavutil/colorspace.h"
34 #include "libavutil/opt.h"
35
36 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
37 #define MAX_EPOCH_PALETTES 8 // Max 8 allowed per PGS epoch
38 #define MAX_EPOCH_OBJECTS 64 // Max 64 allowed per PGS epoch
39 #define MAX_OBJECT_REFS 2 // Max objects per display set
40
41 enum SegmentType {
42 PALETTE_SEGMENT = 0x14,
43 OBJECT_SEGMENT = 0x15,
44 PRESENTATION_SEGMENT = 0x16,
45 WINDOW_SEGMENT = 0x17,
46 DISPLAY_SEGMENT = 0x80,
47 };
48
49 typedef struct PGSSubObjectRef {
50 int id;
51 int window_id;
52 uint8_t composition_flag;
53 int x;
54 int y;
55 int crop_x;
56 int crop_y;
57 int crop_w;
58 int crop_h;
59 } PGSSubObjectRef;
60
61 typedef struct PGSSubPresentation {
62 int id_number;
63 int palette_id;
64 int object_count;
65 PGSSubObjectRef objects[MAX_OBJECT_REFS];
66 int64_t pts;
67 } PGSSubPresentation;
68
69 typedef struct PGSSubObject {
70 int id;
71 int w;
72 int h;
73 uint8_t *rle;
74 unsigned int rle_buffer_size, rle_data_len;
75 unsigned int rle_remaining_len;
76 } PGSSubObject;
77
78 typedef struct PGSSubObjects {
79 int count;
80 PGSSubObject object[MAX_EPOCH_OBJECTS];
81 } PGSSubObjects;
82
83 typedef struct PGSSubPalette {
84 int id;
85 uint32_t clut[256];
86 } PGSSubPalette;
87
88 typedef struct PGSSubPalettes {
89 int count;
90 PGSSubPalette palette[MAX_EPOCH_PALETTES];
91 } PGSSubPalettes;
92
93 typedef struct PGSSubContext {
94 AVClass *class;
95 PGSSubPresentation presentation;
96 PGSSubPalettes palettes;
97 PGSSubObjects objects;
98 int forced_subs_only;
99 } PGSSubContext;
100
101 17 static void flush_cache(AVCodecContext *avctx)
102 {
103 17 PGSSubContext *ctx = avctx->priv_data;
104 int i;
105
106
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24 for (i = 0; i < ctx->objects.count; i++) {
107 7 av_freep(&ctx->objects.object[i].rle);
108 7 ctx->objects.object[i].rle_buffer_size = 0;
109 7 ctx->objects.object[i].rle_remaining_len = 0;
110 }
111 17 ctx->objects.count = 0;
112 17 ctx->palettes.count = 0;
113 17 }
114
115 13 static PGSSubObject * find_object(int id, PGSSubObjects *objects)
116 {
117 int i;
118
119
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19 for (i = 0; i < objects->count; i++) {
120
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12 if (objects->object[i].id == id)
121 6 return &objects->object[i];
122 }
123 7 return NULL;
124 }
125
126 7 static PGSSubPalette * find_palette(int id, PGSSubPalettes *palettes)
127 {
128 int i;
129
130
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7 for (i = 0; i < palettes->count; i++) {
131
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3 if (palettes->palette[i].id == id)
132 3 return &palettes->palette[i];
133 }
134 4 return NULL;
135 }
136
137 8 static av_cold int init_decoder(AVCodecContext *avctx)
138 {
139 8 avctx->pix_fmt = AV_PIX_FMT_PAL8;
140
141 8 return 0;
142 }
143
144 8 static av_cold int close_decoder(AVCodecContext *avctx)
145 {
146 8 flush_cache(avctx);
147
148 8 return 0;
149 }
150
151 /**
152 * Decode the RLE data.
153 *
154 * The subtitle is stored as a Run Length Encoded image.
155 *
156 * @param avctx contains the current codec context
157 * @param sub pointer to the processed subtitle data
158 * @param buf pointer to the RLE data to process
159 * @param buf_size size of the RLE data to process
160 */
161 6 static int decode_rle(AVCodecContext *avctx, AVSubtitleRect *rect,
162 const uint8_t *buf, unsigned int buf_size)
163 {
164 const uint8_t *rle_bitmap_end;
165 int pixel_count, line_count;
166
167 6 rle_bitmap_end = buf + buf_size;
168
169 6 rect->data[0] = av_malloc_array(rect->w, rect->h);
170
171
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6 if (!rect->data[0])
172 return AVERROR(ENOMEM);
173
174 6 pixel_count = 0;
175 6 line_count = 0;
176
177
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47187 while (buf < rle_bitmap_end && line_count < rect->h) {
178 uint8_t flags, color;
179 int run;
180
181 47181 color = bytestream_get_byte(&buf);
182 47181 run = 1;
183
184
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47181 if (color == 0x00) {
185 17154 flags = bytestream_get_byte(&buf);
186 17154 run = flags & 0x3f;
187
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17154 if (flags & 0x40)
188 762 run = (run << 8) + bytestream_get_byte(&buf);
189
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17154 color = flags & 0x80 ? bytestream_get_byte(&buf) : 0;
190 }
191
192
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47181 if (run > 0 && pixel_count + run <= rect->w * rect->h) {
193 46791 memset(rect->data[0] + pixel_count, color, run);
194 46791 pixel_count += run;
195
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390 } else if (!run) {
196 /*
197 * New Line. Check if correct pixels decoded, if not display warning
198 * and adjust bitmap pointer to correct new line position.
199 */
200
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390 if (pixel_count % rect->w > 0) {
201 av_log(avctx, AV_LOG_ERROR, "Decoded %d pixels, when line should be %d pixels\n",
202 pixel_count % rect->w, rect->w);
203 if (avctx->err_recognition & AV_EF_EXPLODE) {
204 return AVERROR_INVALIDDATA;
205 }
206 }
207 390 line_count++;
208 }
209 }
210
211
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6 if (pixel_count < rect->w * rect->h) {
212 av_log(avctx, AV_LOG_ERROR, "Insufficient RLE data for subtitle\n");
213 return AVERROR_INVALIDDATA;
214 }
215
216 ff_dlog(avctx, "Pixel Count = %d, Area = %d\n", pixel_count, rect->w * rect->h);
217
218 6 return 0;
219 }
220
221 /**
222 * Parse the picture segment packet.
223 *
224 * The picture segment contains details on the sequence id,
225 * width, height and Run Length Encoded (RLE) bitmap data.
226 *
227 * @param avctx contains the current codec context
228 * @param buf pointer to the packet to process
229 * @param buf_size size of packet to process
230 */
231 7 static int parse_object_segment(AVCodecContext *avctx,
232 const uint8_t *buf, int buf_size)
233 {
234 7 PGSSubContext *ctx = avctx->priv_data;
235 PGSSubObject *object;
236
237 uint8_t sequence_desc;
238 unsigned int rle_bitmap_len, width, height;
239 int id;
240
241
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7 if (buf_size <= 4)
242 return AVERROR_INVALIDDATA;
243 7 buf_size -= 4;
244
245 7 id = bytestream_get_be16(&buf);
246 7 object = find_object(id, &ctx->objects);
247
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7 if (!object) {
248
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7 if (ctx->objects.count >= MAX_EPOCH_OBJECTS) {
249 av_log(avctx, AV_LOG_ERROR, "Too many objects in epoch\n");
250 return AVERROR_INVALIDDATA;
251 }
252 7 object = &ctx->objects.object[ctx->objects.count++];
253 7 object->id = id;
254 }
255
256 /* skip object version number */
257 7 buf += 1;
258
259 /* Read the Sequence Description to determine if start of RLE data or appended to previous RLE */
260 7 sequence_desc = bytestream_get_byte(&buf);
261
262
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7 if (!(sequence_desc & 0x80)) {
263 /* Additional RLE data */
264 if (buf_size > object->rle_remaining_len)
265 return AVERROR_INVALIDDATA;
266
267 memcpy(object->rle + object->rle_data_len, buf, buf_size);
268 object->rle_data_len += buf_size;
269 object->rle_remaining_len -= buf_size;
270
271 return 0;
272 }
273
274
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7 if (buf_size <= 7)
275 return AVERROR_INVALIDDATA;
276 7 buf_size -= 7;
277
278 /* Decode rle bitmap length, stored size includes width/height data */
279 7 rle_bitmap_len = bytestream_get_be24(&buf) - 2*2;
280
281
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7 if (buf_size > rle_bitmap_len) {
282 av_log(avctx, AV_LOG_ERROR,
283 "Buffer dimension %d larger than the expected RLE data %d\n",
284 buf_size, rle_bitmap_len);
285 return AVERROR_INVALIDDATA;
286 }
287
288 /* Get bitmap dimensions from data */
289 7 width = bytestream_get_be16(&buf);
290 7 height = bytestream_get_be16(&buf);
291
292 /* Make sure the bitmap is not too large */
293
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7 if (avctx->width < width || avctx->height < height || !width || !height) {
294 av_log(avctx, AV_LOG_ERROR, "Bitmap dimensions (%dx%d) invalid.\n", width, height);
295 return AVERROR_INVALIDDATA;
296 }
297
298 7 object->w = width;
299 7 object->h = height;
300
301 7 av_fast_padded_malloc(&object->rle, &object->rle_buffer_size, rle_bitmap_len);
302
303
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7 if (!object->rle) {
304 object->rle_data_len = 0;
305 object->rle_remaining_len = 0;
306 return AVERROR(ENOMEM);
307 }
308
309 7 memcpy(object->rle, buf, buf_size);
310 7 object->rle_data_len = buf_size;
311 7 object->rle_remaining_len = rle_bitmap_len - buf_size;
312
313 7 return 0;
314 }
315
316 /**
317 * Parse the palette segment packet.
318 *
319 * The palette segment contains details of the palette,
320 * a maximum of 256 colors can be defined.
321 *
322 * @param avctx contains the current codec context
323 * @param buf pointer to the packet to process
324 * @param buf_size size of packet to process
325 */
326 4 static int parse_palette_segment(AVCodecContext *avctx,
327 const uint8_t *buf, int buf_size)
328 {
329 4 PGSSubContext *ctx = avctx->priv_data;
330 PGSSubPalette *palette;
331
332 4 const uint8_t *buf_end = buf + buf_size;
333 4 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
334 int color_id;
335 int y, cb, cr, alpha;
336 int r, g, b, r_add, g_add, b_add;
337 int id;
338
339 4 id = bytestream_get_byte(&buf);
340 4 palette = find_palette(id, &ctx->palettes);
341
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4 if (!palette) {
342
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4 if (ctx->palettes.count >= MAX_EPOCH_PALETTES) {
343 av_log(avctx, AV_LOG_ERROR, "Too many palettes in epoch\n");
344 return AVERROR_INVALIDDATA;
345 }
346 4 palette = &ctx->palettes.palette[ctx->palettes.count++];
347 4 palette->id = id;
348 }
349
350 /* Skip palette version */
351 4 buf += 1;
352
353
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128 while (buf < buf_end) {
354 124 color_id = bytestream_get_byte(&buf);
355 124 y = bytestream_get_byte(&buf);
356 124 cr = bytestream_get_byte(&buf);
357 124 cb = bytestream_get_byte(&buf);
358 124 alpha = bytestream_get_byte(&buf);
359
360 /* Default to BT.709 colorspace. In case of <= 576 height use BT.601 */
361
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124 if (avctx->height <= 0 || avctx->height > 576) {
362 124 YUV_TO_RGB1_CCIR_BT709(cb, cr);
363 } else {
364 YUV_TO_RGB1_CCIR(cb, cr);
365 }
366
367 124 YUV_TO_RGB2_CCIR(r, g, b, y);
368
369 ff_dlog(avctx, "Color %d := (%d,%d,%d,%d)\n", color_id, r, g, b, alpha);
370
371 /* Store color in palette */
372 124 palette->clut[color_id] = RGBA(r,g,b,alpha);
373 }
374 4 return 0;
375 }
376
377 /**
378 * Parse the presentation segment packet.
379 *
380 * The presentation segment contains details on the video
381 * width, video height, x & y subtitle position.
382 *
383 * @param avctx contains the current codec context
384 * @param buf pointer to the packet to process
385 * @param buf_size size of packet to process
386 * @todo TODO: Implement cropping
387 */
388 9 static int parse_presentation_segment(AVCodecContext *avctx,
389 const uint8_t *buf, int buf_size,
390 int64_t pts)
391 {
392 9 PGSSubContext *ctx = avctx->priv_data;
393 int i, state, ret;
394 9 const uint8_t *buf_end = buf + buf_size;
395
396 // Video descriptor
397 9 int w = bytestream_get_be16(&buf);
398 9 int h = bytestream_get_be16(&buf);
399
400 9 ctx->presentation.pts = pts;
401
402 ff_dlog(avctx, "Video Dimensions %dx%d\n",
403 w, h);
404 9 ret = ff_set_dimensions(avctx, w, h);
405
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9 if (ret < 0)
406 return ret;
407
408 /* Skip 1 bytes of unknown, frame rate */
409 9 buf++;
410
411 // Composition descriptor
412 9 ctx->presentation.id_number = bytestream_get_be16(&buf);
413 /*
414 * state is a 2 bit field that defines pgs epoch boundaries
415 * 00 - Normal, previously defined objects and palettes are still valid
416 * 01 - Acquisition point, previous objects and palettes can be released
417 * 10 - Epoch start, previous objects and palettes can be released
418 * 11 - Epoch continue, previous objects and palettes can be released
419 *
420 * reserved 6 bits discarded
421 */
422 9 state = bytestream_get_byte(&buf) >> 6;
423
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9 if (state != 0) {
424 9 flush_cache(avctx);
425 }
426
427 /*
428 * skip palette_update_flag (0x80),
429 */
430 9 buf += 1;
431 9 ctx->presentation.palette_id = bytestream_get_byte(&buf);
432 9 ctx->presentation.object_count = bytestream_get_byte(&buf);
433
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9 if (ctx->presentation.object_count > MAX_OBJECT_REFS) {
434 av_log(avctx, AV_LOG_ERROR,
435 "Invalid number of presentation objects %d\n",
436 ctx->presentation.object_count);
437 ctx->presentation.object_count = 2;
438 if (avctx->err_recognition & AV_EF_EXPLODE) {
439 return AVERROR_INVALIDDATA;
440 }
441 }
442
443
444
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27 for (i = 0; i < ctx->presentation.object_count; i++)
445 {
446 18 PGSSubObjectRef *const object = &ctx->presentation.objects[i];
447
448
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18 if (buf_end - buf < 8) {
449 av_log(avctx, AV_LOG_ERROR, "Insufficent space for object\n");
450 ctx->presentation.object_count = i;
451 return AVERROR_INVALIDDATA;
452 }
453
454 18 object->id = bytestream_get_be16(&buf);
455 18 object->window_id = bytestream_get_byte(&buf);
456 18 object->composition_flag = bytestream_get_byte(&buf);
457
458 18 object->x = bytestream_get_be16(&buf);
459 18 object->y = bytestream_get_be16(&buf);
460
461 // If cropping
462
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18 if (object->composition_flag & 0x80) {
463 object->crop_x = bytestream_get_be16(&buf);
464 object->crop_y = bytestream_get_be16(&buf);
465 object->crop_w = bytestream_get_be16(&buf);
466 object->crop_h = bytestream_get_be16(&buf);
467 }
468
469 ff_dlog(avctx, "Subtitle Placement x=%d, y=%d\n",
470 object->x, object->y);
471
472
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18 if (object->x > avctx->width || object->y > avctx->height) {
473 av_log(avctx, AV_LOG_ERROR, "Subtitle out of video bounds. x = %d, y = %d, video width = %d, video height = %d.\n",
474 object->x, object->y,
475 avctx->width, avctx->height);
476 object->y = object->x = 0;
477 if (avctx->err_recognition & AV_EF_EXPLODE) {
478 return AVERROR_INVALIDDATA;
479 }
480 }
481 }
482
483 9 return 0;
484 }
485
486 /**
487 * Parse the display segment packet.
488 *
489 * The display segment controls the updating of the display.
490 *
491 * @param avctx contains the current codec context
492 * @param data pointer to the data pertaining the subtitle to display
493 * @param buf pointer to the packet to process
494 * @param buf_size size of packet to process
495 */
496 3 static int display_end_segment(AVCodecContext *avctx, AVSubtitle *sub,
497 const uint8_t *buf, int buf_size)
498 {
499 3 PGSSubContext *ctx = avctx->priv_data;
500 int64_t pts;
501 PGSSubPalette *palette;
502 int i, ret;
503
504
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3 pts = ctx->presentation.pts != AV_NOPTS_VALUE ? ctx->presentation.pts : sub->pts;
505 3 memset(sub, 0, sizeof(*sub));
506 3 sub->pts = pts;
507 3 ctx->presentation.pts = AV_NOPTS_VALUE;
508 3 sub->start_display_time = 0;
509 // There is no explicit end time for PGS subtitles. The end time
510 // is defined by the start of the next sub which may contain no
511 // objects (i.e. clears the previous sub)
512 3 sub->end_display_time = UINT32_MAX;
513 3 sub->format = 0;
514
515 // Blank if last object_count was 0.
516
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3 if (!ctx->presentation.object_count)
517 return 1;
518 3 sub->rects = av_calloc(ctx->presentation.object_count, sizeof(*sub->rects));
519
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3 if (!sub->rects) {
520 return AVERROR(ENOMEM);
521 }
522 3 palette = find_palette(ctx->presentation.palette_id, &ctx->palettes);
523
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3 if (!palette) {
524 // Missing palette. Should only happen with damaged streams.
525 av_log(avctx, AV_LOG_ERROR, "Invalid palette id %d\n",
526 ctx->presentation.palette_id);
527 avsubtitle_free(sub);
528 return AVERROR_INVALIDDATA;
529 }
530
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9 for (i = 0; i < ctx->presentation.object_count; i++) {
531 6 AVSubtitleRect *const rect = av_mallocz(sizeof(*rect));
532 PGSSubObject *object;
533
534
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6 if (!rect)
535 return AVERROR(ENOMEM);
536 6 sub->rects[sub->num_rects++] = rect;
537 6 rect->type = SUBTITLE_BITMAP;
538
539 /* Process bitmap */
540 6 object = find_object(ctx->presentation.objects[i].id, &ctx->objects);
541
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6 if (!object) {
542 // Missing object. Should only happen with damaged streams.
543 av_log(avctx, AV_LOG_ERROR, "Invalid object id %d\n",
544 ctx->presentation.objects[i].id);
545 if (avctx->err_recognition & AV_EF_EXPLODE)
546 return AVERROR_INVALIDDATA;
547 // Leaves rect empty with 0 width and height.
548 continue;
549 }
550
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6 if (ctx->presentation.objects[i].composition_flag & 0x40)
551 rect->flags |= AV_SUBTITLE_FLAG_FORCED;
552
553 6 rect->x = ctx->presentation.objects[i].x;
554 6 rect->y = ctx->presentation.objects[i].y;
555
556
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6 if (object->rle) {
557 6 rect->w = object->w;
558 6 rect->h = object->h;
559
560 6 rect->linesize[0] = object->w;
561
562
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6 if (object->rle_remaining_len) {
563 av_log(avctx, AV_LOG_ERROR, "RLE data length %u is %u bytes shorter than expected\n",
564 object->rle_data_len, object->rle_remaining_len);
565 if (avctx->err_recognition & AV_EF_EXPLODE)
566 return AVERROR_INVALIDDATA;
567 }
568 6 ret = decode_rle(avctx, rect, object->rle, object->rle_data_len);
569
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6 if (ret < 0) {
570 if ((avctx->err_recognition & AV_EF_EXPLODE) ||
571 ret == AVERROR(ENOMEM)) {
572 return ret;
573 }
574 rect->w = 0;
575 rect->h = 0;
576 continue;
577 }
578 }
579 /* Allocate memory for colors */
580 6 rect->nb_colors = 256;
581 6 rect->data[1] = av_mallocz(AVPALETTE_SIZE);
582
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6 if (!rect->data[1])
583 return AVERROR(ENOMEM);
584
585
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6 if (!ctx->forced_subs_only || ctx->presentation.objects[i].composition_flag & 0x40)
586 6 memcpy(rect->data[1], palette->clut, rect->nb_colors * sizeof(uint32_t));
587 }
588 3 return 1;
589 }
590
591 17 static int decode(AVCodecContext *avctx, AVSubtitle *sub,
592 int *got_sub_ptr, const AVPacket *avpkt)
593 {
594 17 const uint8_t *buf = avpkt->data;
595 17 int buf_size = avpkt->size;
596
597 const uint8_t *buf_end;
598 uint8_t segment_type;
599 int segment_length;
600 int i, ret;
601
602 ff_dlog(avctx, "PGS sub packet:\n");
603
604
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101703 for (i = 0; i < buf_size; i++) {
605 ff_dlog(avctx, "%02x ", buf[i]);
606 101686 if (i % 16 == 15)
607 ff_dlog(avctx, "\n");
608 }
609
610 17 if (i & 15)
611 ff_dlog(avctx, "\n");
612
613 17 *got_sub_ptr = 0;
614
615 /* Ensure that we have received at a least a segment code and segment length */
616
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17 if (buf_size < 3)
617 return -1;
618
619 17 buf_end = buf + buf_size;
620
621 /* Step through buffer to identify segments */
622
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44 while (buf < buf_end) {
623 27 segment_type = bytestream_get_byte(&buf);
624 27 segment_length = bytestream_get_be16(&buf);
625
626 ff_dlog(avctx, "Segment Length %d, Segment Type %x\n", segment_length, segment_type);
627
628
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27 if (segment_type != DISPLAY_SEGMENT && segment_length > buf_end - buf)
629 break;
630
631 27 ret = 0;
632
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27 switch (segment_type) {
633 4 case PALETTE_SEGMENT:
634 4 ret = parse_palette_segment(avctx, buf, segment_length);
635 4 break;
636 7 case OBJECT_SEGMENT:
637 7 ret = parse_object_segment(avctx, buf, segment_length);
638 7 break;
639 9 case PRESENTATION_SEGMENT:
640 9 ret = parse_presentation_segment(avctx, buf, segment_length, sub->pts);
641 9 break;
642 4 case WINDOW_SEGMENT:
643 /*
644 * Window Segment Structure (No new information provided):
645 * 2 bytes: Unknown,
646 * 2 bytes: X position of subtitle,
647 * 2 bytes: Y position of subtitle,
648 * 2 bytes: Width of subtitle,
649 * 2 bytes: Height of subtitle.
650 */
651 4 break;
652 3 case DISPLAY_SEGMENT:
653
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3 if (*got_sub_ptr) {
654 av_log(avctx, AV_LOG_ERROR, "Duplicate display segment\n");
655 ret = AVERROR_INVALIDDATA;
656 break;
657 }
658 3 ret = display_end_segment(avctx, sub, buf, segment_length);
659
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3 if (ret >= 0)
660 3 *got_sub_ptr = ret;
661 3 break;
662 default:
663 av_log(avctx, AV_LOG_ERROR, "Unknown subtitle segment type 0x%x, length %d\n",
664 segment_type, segment_length);
665 ret = AVERROR_INVALIDDATA;
666 break;
667 }
668
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27 if (ret < 0 && (ret == AVERROR(ENOMEM) ||
669 avctx->err_recognition & AV_EF_EXPLODE))
670 return ret;
671
672 27 buf += segment_length;
673 }
674
675 17 return buf_size;
676 }
677
678 #define OFFSET(x) offsetof(PGSSubContext, x)
679 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
680 static const AVOption options[] = {
681 {"forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
682 { NULL },
683 };
684
685 static const AVClass pgsdec_class = {
686 .class_name = "PGS subtitle decoder",
687 .item_name = av_default_item_name,
688 .option = options,
689 .version = LIBAVUTIL_VERSION_INT,
690 };
691
692 const FFCodec ff_pgssub_decoder = {
693 .p.name = "pgssub",
694 CODEC_LONG_NAME("HDMV Presentation Graphic Stream subtitles"),
695 .p.type = AVMEDIA_TYPE_SUBTITLE,
696 .p.id = AV_CODEC_ID_HDMV_PGS_SUBTITLE,
697 .priv_data_size = sizeof(PGSSubContext),
698 .init = init_decoder,
699 .close = close_decoder,
700 FF_CODEC_DECODE_SUB_CB(decode),
701 .p.priv_class = &pgsdec_class,
702 };
703