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2ba45a60 DM |
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 "internal.h" | |
30 | #include "mathops.h" | |
31 | ||
32 | #include "libavutil/colorspace.h" | |
33 | #include "libavutil/imgutils.h" | |
34 | #include "libavutil/opt.h" | |
35 | ||
36 | #define RGBA(r,g,b,a) (((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 | static void flush_cache(AVCodecContext *avctx) | |
102 | { | |
103 | PGSSubContext *ctx = avctx->priv_data; | |
104 | int i; | |
105 | ||
106 | for (i = 0; i < ctx->objects.count; i++) { | |
107 | av_freep(&ctx->objects.object[i].rle); | |
108 | ctx->objects.object[i].rle_buffer_size = 0; | |
109 | ctx->objects.object[i].rle_remaining_len = 0; | |
110 | } | |
111 | ctx->objects.count = 0; | |
112 | ctx->palettes.count = 0; | |
113 | } | |
114 | ||
115 | static PGSSubObject * find_object(int id, PGSSubObjects *objects) | |
116 | { | |
117 | int i; | |
118 | ||
119 | for (i = 0; i < objects->count; i++) { | |
120 | if (objects->object[i].id == id) | |
121 | return &objects->object[i]; | |
122 | } | |
123 | return NULL; | |
124 | } | |
125 | ||
126 | static PGSSubPalette * find_palette(int id, PGSSubPalettes *palettes) | |
127 | { | |
128 | int i; | |
129 | ||
130 | for (i = 0; i < palettes->count; i++) { | |
131 | if (palettes->palette[i].id == id) | |
132 | return &palettes->palette[i]; | |
133 | } | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | static av_cold int init_decoder(AVCodecContext *avctx) | |
138 | { | |
139 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static av_cold int close_decoder(AVCodecContext *avctx) | |
145 | { | |
146 | flush_cache(avctx); | |
147 | ||
148 | 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 | 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 | rle_bitmap_end = buf + buf_size; | |
168 | ||
169 | rect->pict.data[0] = av_malloc(rect->w * rect->h); | |
170 | ||
171 | if (!rect->pict.data[0]) | |
172 | return AVERROR(ENOMEM); | |
173 | ||
174 | pixel_count = 0; | |
175 | line_count = 0; | |
176 | ||
177 | while (buf < rle_bitmap_end && line_count < rect->h) { | |
178 | uint8_t flags, color; | |
179 | int run; | |
180 | ||
181 | color = bytestream_get_byte(&buf); | |
182 | run = 1; | |
183 | ||
184 | if (color == 0x00) { | |
185 | flags = bytestream_get_byte(&buf); | |
186 | run = flags & 0x3f; | |
187 | if (flags & 0x40) | |
188 | run = (run << 8) + bytestream_get_byte(&buf); | |
189 | color = flags & 0x80 ? bytestream_get_byte(&buf) : 0; | |
190 | } | |
191 | ||
192 | if (run > 0 && pixel_count + run <= rect->w * rect->h) { | |
193 | memset(rect->pict.data[0] + pixel_count, color, run); | |
194 | pixel_count += run; | |
195 | } 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 | 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 | line_count++; | |
208 | } | |
209 | } | |
210 | ||
211 | 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 | av_dlog(avctx, "Pixel Count = %d, Area = %d\n", pixel_count, rect->w * rect->h); | |
217 | ||
218 | 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 | static int parse_object_segment(AVCodecContext *avctx, | |
232 | const uint8_t *buf, int buf_size) | |
233 | { | |
234 | 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 | if (buf_size <= 4) | |
242 | return AVERROR_INVALIDDATA; | |
243 | buf_size -= 4; | |
244 | ||
245 | id = bytestream_get_be16(&buf); | |
246 | object = find_object(id, &ctx->objects); | |
247 | if (!object) { | |
248 | 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 | object = &ctx->objects.object[ctx->objects.count++]; | |
253 | object->id = id; | |
254 | } | |
255 | ||
256 | /* skip object version number */ | |
257 | buf += 1; | |
258 | ||
259 | /* Read the Sequence Description to determine if start of RLE data or appended to previous RLE */ | |
260 | sequence_desc = bytestream_get_byte(&buf); | |
261 | ||
262 | 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 | if (buf_size <= 7) | |
275 | return AVERROR_INVALIDDATA; | |
276 | buf_size -= 7; | |
277 | ||
278 | /* Decode rle bitmap length, stored size includes width/height data */ | |
279 | rle_bitmap_len = bytestream_get_be24(&buf) - 2*2; | |
280 | ||
281 | 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 | width = bytestream_get_be16(&buf); | |
290 | height = bytestream_get_be16(&buf); | |
291 | ||
292 | /* Make sure the bitmap is not too large */ | |
293 | if (avctx->width < width || avctx->height < height) { | |
294 | av_log(avctx, AV_LOG_ERROR, "Bitmap dimensions larger than video.\n"); | |
295 | return AVERROR_INVALIDDATA; | |
296 | } | |
297 | ||
298 | object->w = width; | |
299 | object->h = height; | |
300 | ||
301 | av_fast_padded_malloc(&object->rle, &object->rle_buffer_size, rle_bitmap_len); | |
302 | ||
303 | if (!object->rle) | |
304 | return AVERROR(ENOMEM); | |
305 | ||
306 | memcpy(object->rle, buf, buf_size); | |
307 | object->rle_data_len = buf_size; | |
308 | object->rle_remaining_len = rle_bitmap_len - buf_size; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | /** | |
314 | * Parse the palette segment packet. | |
315 | * | |
316 | * The palette segment contains details of the palette, | |
317 | * a maximum of 256 colors can be defined. | |
318 | * | |
319 | * @param avctx contains the current codec context | |
320 | * @param buf pointer to the packet to process | |
321 | * @param buf_size size of packet to process | |
322 | */ | |
323 | static int parse_palette_segment(AVCodecContext *avctx, | |
324 | const uint8_t *buf, int buf_size) | |
325 | { | |
326 | PGSSubContext *ctx = avctx->priv_data; | |
327 | PGSSubPalette *palette; | |
328 | ||
329 | const uint8_t *buf_end = buf + buf_size; | |
330 | const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; | |
331 | int color_id; | |
332 | int y, cb, cr, alpha; | |
333 | int r, g, b, r_add, g_add, b_add; | |
334 | int id; | |
335 | ||
336 | id = bytestream_get_byte(&buf); | |
337 | palette = find_palette(id, &ctx->palettes); | |
338 | if (!palette) { | |
339 | if (ctx->palettes.count >= MAX_EPOCH_PALETTES) { | |
340 | av_log(avctx, AV_LOG_ERROR, "Too many palettes in epoch\n"); | |
341 | return AVERROR_INVALIDDATA; | |
342 | } | |
343 | palette = &ctx->palettes.palette[ctx->palettes.count++]; | |
344 | palette->id = id; | |
345 | } | |
346 | ||
347 | /* Skip palette version */ | |
348 | buf += 1; | |
349 | ||
350 | while (buf < buf_end) { | |
351 | color_id = bytestream_get_byte(&buf); | |
352 | y = bytestream_get_byte(&buf); | |
353 | cr = bytestream_get_byte(&buf); | |
354 | cb = bytestream_get_byte(&buf); | |
355 | alpha = bytestream_get_byte(&buf); | |
356 | ||
357 | YUV_TO_RGB1(cb, cr); | |
358 | YUV_TO_RGB2(r, g, b, y); | |
359 | ||
360 | av_dlog(avctx, "Color %d := (%d,%d,%d,%d)\n", color_id, r, g, b, alpha); | |
361 | ||
362 | /* Store color in palette */ | |
363 | palette->clut[color_id] = RGBA(r,g,b,alpha); | |
364 | } | |
365 | return 0; | |
366 | } | |
367 | ||
368 | /** | |
369 | * Parse the presentation segment packet. | |
370 | * | |
371 | * The presentation segment contains details on the video | |
372 | * width, video height, x & y subtitle position. | |
373 | * | |
374 | * @param avctx contains the current codec context | |
375 | * @param buf pointer to the packet to process | |
376 | * @param buf_size size of packet to process | |
377 | * @todo TODO: Implement cropping | |
378 | */ | |
379 | static int parse_presentation_segment(AVCodecContext *avctx, | |
380 | const uint8_t *buf, int buf_size, | |
381 | int64_t pts) | |
382 | { | |
383 | PGSSubContext *ctx = avctx->priv_data; | |
384 | int i, state, ret; | |
385 | const uint8_t *buf_end = buf + buf_size; | |
386 | ||
387 | // Video descriptor | |
388 | int w = bytestream_get_be16(&buf); | |
389 | int h = bytestream_get_be16(&buf); | |
390 | ||
391 | ctx->presentation.pts = pts; | |
392 | ||
393 | av_dlog(avctx, "Video Dimensions %dx%d\n", | |
394 | w, h); | |
395 | ret = ff_set_dimensions(avctx, w, h); | |
396 | if (ret < 0) | |
397 | return ret; | |
398 | ||
399 | /* Skip 1 bytes of unknown, frame rate */ | |
400 | buf++; | |
401 | ||
402 | // Composition descriptor | |
403 | ctx->presentation.id_number = bytestream_get_be16(&buf); | |
404 | /* | |
405 | * state is a 2 bit field that defines pgs epoch boundaries | |
406 | * 00 - Normal, previously defined objects and palettes are still valid | |
407 | * 01 - Acquisition point, previous objects and palettes can be released | |
408 | * 10 - Epoch start, previous objects and palettes can be released | |
409 | * 11 - Epoch continue, previous objects and palettes can be released | |
410 | * | |
411 | * reserved 6 bits discarded | |
412 | */ | |
413 | state = bytestream_get_byte(&buf) >> 6; | |
414 | if (state != 0) { | |
415 | flush_cache(avctx); | |
416 | } | |
417 | ||
418 | /* | |
419 | * skip palette_update_flag (0x80), | |
420 | */ | |
421 | buf += 1; | |
422 | ctx->presentation.palette_id = bytestream_get_byte(&buf); | |
423 | ctx->presentation.object_count = bytestream_get_byte(&buf); | |
424 | if (ctx->presentation.object_count > MAX_OBJECT_REFS) { | |
425 | av_log(avctx, AV_LOG_ERROR, | |
426 | "Invalid number of presentation objects %d\n", | |
427 | ctx->presentation.object_count); | |
428 | ctx->presentation.object_count = 2; | |
429 | if (avctx->err_recognition & AV_EF_EXPLODE) { | |
430 | return AVERROR_INVALIDDATA; | |
431 | } | |
432 | } | |
433 | ||
434 | ||
435 | for (i = 0; i < ctx->presentation.object_count; i++) | |
436 | { | |
437 | ||
438 | if (buf_end - buf < 8) { | |
439 | av_log(avctx, AV_LOG_ERROR, "Insufficent space for object\n"); | |
440 | ctx->presentation.object_count = i; | |
441 | return AVERROR_INVALIDDATA; | |
442 | } | |
443 | ||
444 | ctx->presentation.objects[i].id = bytestream_get_be16(&buf); | |
445 | ctx->presentation.objects[i].window_id = bytestream_get_byte(&buf); | |
446 | ctx->presentation.objects[i].composition_flag = bytestream_get_byte(&buf); | |
447 | ||
448 | ctx->presentation.objects[i].x = bytestream_get_be16(&buf); | |
449 | ctx->presentation.objects[i].y = bytestream_get_be16(&buf); | |
450 | ||
451 | // If cropping | |
452 | if (ctx->presentation.objects[i].composition_flag & 0x80) { | |
453 | ctx->presentation.objects[i].crop_x = bytestream_get_be16(&buf); | |
454 | ctx->presentation.objects[i].crop_y = bytestream_get_be16(&buf); | |
455 | ctx->presentation.objects[i].crop_w = bytestream_get_be16(&buf); | |
456 | ctx->presentation.objects[i].crop_h = bytestream_get_be16(&buf); | |
457 | } | |
458 | ||
459 | av_dlog(avctx, "Subtitle Placement x=%d, y=%d\n", | |
460 | ctx->presentation.objects[i].x, ctx->presentation.objects[i].y); | |
461 | ||
462 | if (ctx->presentation.objects[i].x > avctx->width || | |
463 | ctx->presentation.objects[i].y > avctx->height) { | |
464 | av_log(avctx, AV_LOG_ERROR, "Subtitle out of video bounds. x = %d, y = %d, video width = %d, video height = %d.\n", | |
465 | ctx->presentation.objects[i].x, | |
466 | ctx->presentation.objects[i].y, | |
467 | avctx->width, avctx->height); | |
468 | ctx->presentation.objects[i].x = 0; | |
469 | ctx->presentation.objects[i].y = 0; | |
470 | if (avctx->err_recognition & AV_EF_EXPLODE) { | |
471 | return AVERROR_INVALIDDATA; | |
472 | } | |
473 | } | |
474 | } | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | /** | |
480 | * Parse the display segment packet. | |
481 | * | |
482 | * The display segment controls the updating of the display. | |
483 | * | |
484 | * @param avctx contains the current codec context | |
485 | * @param data pointer to the data pertaining the subtitle to display | |
486 | * @param buf pointer to the packet to process | |
487 | * @param buf_size size of packet to process | |
488 | */ | |
489 | static int display_end_segment(AVCodecContext *avctx, void *data, | |
490 | const uint8_t *buf, int buf_size) | |
491 | { | |
492 | AVSubtitle *sub = data; | |
493 | PGSSubContext *ctx = avctx->priv_data; | |
494 | int64_t pts; | |
495 | PGSSubPalette *palette; | |
496 | int i, ret; | |
497 | ||
498 | pts = ctx->presentation.pts != AV_NOPTS_VALUE ? ctx->presentation.pts : sub->pts; | |
499 | memset(sub, 0, sizeof(*sub)); | |
500 | sub->pts = pts; | |
501 | ctx->presentation.pts = AV_NOPTS_VALUE; | |
502 | sub->start_display_time = 0; | |
503 | // There is no explicit end time for PGS subtitles. The end time | |
504 | // is defined by the start of the next sub which may contain no | |
505 | // objects (i.e. clears the previous sub) | |
506 | sub->end_display_time = UINT32_MAX; | |
507 | sub->format = 0; | |
508 | ||
509 | // Blank if last object_count was 0. | |
510 | if (!ctx->presentation.object_count) | |
511 | return 1; | |
512 | sub->rects = av_mallocz(sizeof(*sub->rects) * ctx->presentation.object_count); | |
513 | if (!sub->rects) { | |
514 | return AVERROR(ENOMEM); | |
515 | } | |
516 | palette = find_palette(ctx->presentation.palette_id, &ctx->palettes); | |
517 | if (!palette) { | |
518 | // Missing palette. Should only happen with damaged streams. | |
519 | av_log(avctx, AV_LOG_ERROR, "Invalid palette id %d\n", | |
520 | ctx->presentation.palette_id); | |
521 | avsubtitle_free(sub); | |
522 | return AVERROR_INVALIDDATA; | |
523 | } | |
524 | for (i = 0; i < ctx->presentation.object_count; i++) { | |
525 | PGSSubObject *object; | |
526 | ||
527 | sub->rects[i] = av_mallocz(sizeof(*sub->rects[0])); | |
528 | if (!sub->rects[i]) { | |
529 | avsubtitle_free(sub); | |
530 | return AVERROR(ENOMEM); | |
531 | } | |
532 | sub->num_rects++; | |
533 | sub->rects[i]->type = SUBTITLE_BITMAP; | |
534 | ||
535 | /* Process bitmap */ | |
536 | object = find_object(ctx->presentation.objects[i].id, &ctx->objects); | |
537 | if (!object) { | |
538 | // Missing object. Should only happen with damaged streams. | |
539 | av_log(avctx, AV_LOG_ERROR, "Invalid object id %d\n", | |
540 | ctx->presentation.objects[i].id); | |
541 | if (avctx->err_recognition & AV_EF_EXPLODE) { | |
542 | avsubtitle_free(sub); | |
543 | return AVERROR_INVALIDDATA; | |
544 | } | |
545 | // Leaves rect empty with 0 width and height. | |
546 | continue; | |
547 | } | |
548 | if (ctx->presentation.objects[i].composition_flag & 0x40) | |
549 | sub->rects[i]->flags |= AV_SUBTITLE_FLAG_FORCED; | |
550 | ||
551 | sub->rects[i]->x = ctx->presentation.objects[i].x; | |
552 | sub->rects[i]->y = ctx->presentation.objects[i].y; | |
553 | sub->rects[i]->w = object->w; | |
554 | sub->rects[i]->h = object->h; | |
555 | ||
556 | sub->rects[i]->pict.linesize[0] = object->w; | |
557 | ||
558 | if (object->rle) { | |
559 | if (object->rle_remaining_len) { | |
560 | av_log(avctx, AV_LOG_ERROR, "RLE data length %u is %u bytes shorter than expected\n", | |
561 | object->rle_data_len, object->rle_remaining_len); | |
562 | if (avctx->err_recognition & AV_EF_EXPLODE) { | |
563 | avsubtitle_free(sub); | |
564 | return AVERROR_INVALIDDATA; | |
565 | } | |
566 | } | |
567 | ret = decode_rle(avctx, sub->rects[i], object->rle, object->rle_data_len); | |
568 | if (ret < 0) { | |
569 | if ((avctx->err_recognition & AV_EF_EXPLODE) || | |
570 | ret == AVERROR(ENOMEM)) { | |
571 | avsubtitle_free(sub); | |
572 | return ret; | |
573 | } | |
574 | sub->rects[i]->w = 0; | |
575 | sub->rects[i]->h = 0; | |
576 | continue; | |
577 | } | |
578 | } | |
579 | /* Allocate memory for colors */ | |
580 | sub->rects[i]->nb_colors = 256; | |
581 | sub->rects[i]->pict.data[1] = av_mallocz(AVPALETTE_SIZE); | |
582 | if (!sub->rects[i]->pict.data[1]) { | |
583 | avsubtitle_free(sub); | |
584 | return AVERROR(ENOMEM); | |
585 | } | |
586 | ||
587 | if (!ctx->forced_subs_only || ctx->presentation.objects[i].composition_flag & 0x40) | |
588 | memcpy(sub->rects[i]->pict.data[1], palette->clut, sub->rects[i]->nb_colors * sizeof(uint32_t)); | |
589 | ||
590 | } | |
591 | return 1; | |
592 | } | |
593 | ||
594 | static int decode(AVCodecContext *avctx, void *data, int *data_size, | |
595 | AVPacket *avpkt) | |
596 | { | |
597 | const uint8_t *buf = avpkt->data; | |
598 | int buf_size = avpkt->size; | |
599 | ||
600 | const uint8_t *buf_end; | |
601 | uint8_t segment_type; | |
602 | int segment_length; | |
603 | int i, ret; | |
604 | ||
605 | av_dlog(avctx, "PGS sub packet:\n"); | |
606 | ||
607 | for (i = 0; i < buf_size; i++) { | |
608 | av_dlog(avctx, "%02x ", buf[i]); | |
609 | if (i % 16 == 15) | |
610 | av_dlog(avctx, "\n"); | |
611 | } | |
612 | ||
613 | if (i & 15) | |
614 | av_dlog(avctx, "\n"); | |
615 | ||
616 | *data_size = 0; | |
617 | ||
618 | /* Ensure that we have received at a least a segment code and segment length */ | |
619 | if (buf_size < 3) | |
620 | return -1; | |
621 | ||
622 | buf_end = buf + buf_size; | |
623 | ||
624 | /* Step through buffer to identify segments */ | |
625 | while (buf < buf_end) { | |
626 | segment_type = bytestream_get_byte(&buf); | |
627 | segment_length = bytestream_get_be16(&buf); | |
628 | ||
629 | av_dlog(avctx, "Segment Length %d, Segment Type %x\n", segment_length, segment_type); | |
630 | ||
631 | if (segment_type != DISPLAY_SEGMENT && segment_length > buf_end - buf) | |
632 | break; | |
633 | ||
634 | ret = 0; | |
635 | switch (segment_type) { | |
636 | case PALETTE_SEGMENT: | |
637 | ret = parse_palette_segment(avctx, buf, segment_length); | |
638 | break; | |
639 | case OBJECT_SEGMENT: | |
640 | ret = parse_object_segment(avctx, buf, segment_length); | |
641 | break; | |
642 | case PRESENTATION_SEGMENT: | |
643 | ret = parse_presentation_segment(avctx, buf, segment_length, ((AVSubtitle*)(data))->pts); | |
644 | break; | |
645 | case WINDOW_SEGMENT: | |
646 | /* | |
647 | * Window Segment Structure (No new information provided): | |
648 | * 2 bytes: Unknown, | |
649 | * 2 bytes: X position of subtitle, | |
650 | * 2 bytes: Y position of subtitle, | |
651 | * 2 bytes: Width of subtitle, | |
652 | * 2 bytes: Height of subtitle. | |
653 | */ | |
654 | break; | |
655 | case DISPLAY_SEGMENT: | |
656 | ret = display_end_segment(avctx, data, buf, segment_length); | |
657 | if (ret >= 0) | |
658 | *data_size = ret; | |
659 | break; | |
660 | default: | |
661 | av_log(avctx, AV_LOG_ERROR, "Unknown subtitle segment type 0x%x, length %d\n", | |
662 | segment_type, segment_length); | |
663 | ret = AVERROR_INVALIDDATA; | |
664 | break; | |
665 | } | |
666 | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) | |
667 | return ret; | |
668 | ||
669 | buf += segment_length; | |
670 | } | |
671 | ||
672 | return buf_size; | |
673 | } | |
674 | ||
675 | #define OFFSET(x) offsetof(PGSSubContext, x) | |
676 | #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM | |
677 | static const AVOption options[] = { | |
678 | {"forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD}, | |
679 | { NULL }, | |
680 | }; | |
681 | ||
682 | static const AVClass pgsdec_class = { | |
683 | .class_name = "PGS subtitle decoder", | |
684 | .item_name = av_default_item_name, | |
685 | .option = options, | |
686 | .version = LIBAVUTIL_VERSION_INT, | |
687 | }; | |
688 | ||
689 | AVCodec ff_pgssub_decoder = { | |
690 | .name = "pgssub", | |
691 | .long_name = NULL_IF_CONFIG_SMALL("HDMV Presentation Graphic Stream subtitles"), | |
692 | .type = AVMEDIA_TYPE_SUBTITLE, | |
693 | .id = AV_CODEC_ID_HDMV_PGS_SUBTITLE, | |
694 | .priv_data_size = sizeof(PGSSubContext), | |
695 | .init = init_decoder, | |
696 | .close = close_decoder, | |
697 | .decode = decode, | |
698 | .priv_class = &pgsdec_class, | |
699 | }; |