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pgssubdec.c
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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) (((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 
47 };
48 
49 typedef struct PGSSubObjectRef {
50  int id;
51  int window_id;
53  int x;
54  int y;
55  int crop_x;
56  int crop_y;
57  int crop_w;
58  int crop_h;
60 
61 typedef struct PGSSubPresentation {
62  int id_number;
66  int64_t pts;
68 
69 typedef struct PGSSubObject {
70  int id;
71  int w;
72  int h;
75  unsigned int rle_remaining_len;
76 } PGSSubObject;
77 
78 typedef struct PGSSubObjects {
79  int count;
82 
83 typedef struct PGSSubPalette {
84  int id;
85  uint32_t clut[256];
87 
88 typedef struct PGSSubPalettes {
89  int count;
92 
93 typedef struct PGSSubContext {
94  AVClass *class;
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 
138 {
139  avctx->pix_fmt = AV_PIX_FMT_PAL8;
140 
141  return 0;
142 }
143 
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  */
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->data[0] = av_malloc_array(rect->w, rect->h);
170 
171  if (!rect->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) {
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->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  ff_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  */
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 || !width || !height) {
294  av_log(avctx, AV_LOG_ERROR, "Bitmap dimensions (%dx%d) invalid.\n", width, height);
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  */
324  const uint8_t *buf, int buf_size)
325 {
326  PGSSubContext *ctx = avctx->priv_data;
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  /* Default to BT.709 colorspace. In case of <= 576 height use BT.601 */
358  if (avctx->height <= 0 || avctx->height > 576) {
359  YUV_TO_RGB1_CCIR_BT709(cb, cr);
360  } else {
361  YUV_TO_RGB1_CCIR(cb, cr);
362  }
363 
364  YUV_TO_RGB2_CCIR(r, g, b, y);
365 
366  ff_dlog(avctx, "Color %d := (%d,%d,%d,%d)\n", color_id, r, g, b, alpha);
367 
368  /* Store color in palette */
369  palette->clut[color_id] = RGBA(r,g,b,alpha);
370  }
371  return 0;
372 }
373 
374 /**
375  * Parse the presentation segment packet.
376  *
377  * The presentation segment contains details on the video
378  * width, video height, x & y subtitle position.
379  *
380  * @param avctx contains the current codec context
381  * @param buf pointer to the packet to process
382  * @param buf_size size of packet to process
383  * @todo TODO: Implement cropping
384  */
386  const uint8_t *buf, int buf_size,
387  int64_t pts)
388 {
389  PGSSubContext *ctx = avctx->priv_data;
390  int i, state, ret;
391  const uint8_t *buf_end = buf + buf_size;
392 
393  // Video descriptor
394  int w = bytestream_get_be16(&buf);
395  int h = bytestream_get_be16(&buf);
396 
397  ctx->presentation.pts = pts;
398 
399  ff_dlog(avctx, "Video Dimensions %dx%d\n",
400  w, h);
401  ret = ff_set_dimensions(avctx, w, h);
402  if (ret < 0)
403  return ret;
404 
405  /* Skip 1 bytes of unknown, frame rate */
406  buf++;
407 
408  // Composition descriptor
409  ctx->presentation.id_number = bytestream_get_be16(&buf);
410  /*
411  * state is a 2 bit field that defines pgs epoch boundaries
412  * 00 - Normal, previously defined objects and palettes are still valid
413  * 01 - Acquisition point, previous objects and palettes can be released
414  * 10 - Epoch start, previous objects and palettes can be released
415  * 11 - Epoch continue, previous objects and palettes can be released
416  *
417  * reserved 6 bits discarded
418  */
419  state = bytestream_get_byte(&buf) >> 6;
420  if (state != 0) {
421  flush_cache(avctx);
422  }
423 
424  /*
425  * skip palette_update_flag (0x80),
426  */
427  buf += 1;
428  ctx->presentation.palette_id = bytestream_get_byte(&buf);
429  ctx->presentation.object_count = bytestream_get_byte(&buf);
431  av_log(avctx, AV_LOG_ERROR,
432  "Invalid number of presentation objects %d\n",
434  ctx->presentation.object_count = 2;
435  if (avctx->err_recognition & AV_EF_EXPLODE) {
436  return AVERROR_INVALIDDATA;
437  }
438  }
439 
440 
441  for (i = 0; i < ctx->presentation.object_count; i++)
442  {
443 
444  if (buf_end - buf < 8) {
445  av_log(avctx, AV_LOG_ERROR, "Insufficent space for object\n");
446  ctx->presentation.object_count = i;
447  return AVERROR_INVALIDDATA;
448  }
449 
450  ctx->presentation.objects[i].id = bytestream_get_be16(&buf);
451  ctx->presentation.objects[i].window_id = bytestream_get_byte(&buf);
452  ctx->presentation.objects[i].composition_flag = bytestream_get_byte(&buf);
453 
454  ctx->presentation.objects[i].x = bytestream_get_be16(&buf);
455  ctx->presentation.objects[i].y = bytestream_get_be16(&buf);
456 
457  // If cropping
458  if (ctx->presentation.objects[i].composition_flag & 0x80) {
459  ctx->presentation.objects[i].crop_x = bytestream_get_be16(&buf);
460  ctx->presentation.objects[i].crop_y = bytestream_get_be16(&buf);
461  ctx->presentation.objects[i].crop_w = bytestream_get_be16(&buf);
462  ctx->presentation.objects[i].crop_h = bytestream_get_be16(&buf);
463  }
464 
465  ff_dlog(avctx, "Subtitle Placement x=%d, y=%d\n",
466  ctx->presentation.objects[i].x, ctx->presentation.objects[i].y);
467 
468  if (ctx->presentation.objects[i].x > avctx->width ||
469  ctx->presentation.objects[i].y > avctx->height) {
470  av_log(avctx, AV_LOG_ERROR, "Subtitle out of video bounds. x = %d, y = %d, video width = %d, video height = %d.\n",
471  ctx->presentation.objects[i].x,
472  ctx->presentation.objects[i].y,
473  avctx->width, avctx->height);
474  ctx->presentation.objects[i].x = 0;
475  ctx->presentation.objects[i].y = 0;
476  if (avctx->err_recognition & AV_EF_EXPLODE) {
477  return AVERROR_INVALIDDATA;
478  }
479  }
480  }
481 
482  return 0;
483 }
484 
485 /**
486  * Parse the display segment packet.
487  *
488  * The display segment controls the updating of the display.
489  *
490  * @param avctx contains the current codec context
491  * @param data pointer to the data pertaining the subtitle to display
492  * @param buf pointer to the packet to process
493  * @param buf_size size of packet to process
494  */
495 static int display_end_segment(AVCodecContext *avctx, void *data,
496  const uint8_t *buf, int buf_size)
497 {
498  AVSubtitle *sub = data;
499  PGSSubContext *ctx = avctx->priv_data;
500  int64_t pts;
502  int i, ret;
503 
504  pts = ctx->presentation.pts != AV_NOPTS_VALUE ? ctx->presentation.pts : sub->pts;
505  memset(sub, 0, sizeof(*sub));
506  sub->pts = pts;
508  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  sub->end_display_time = UINT32_MAX;
513  sub->format = 0;
514 
515  // Blank if last object_count was 0.
516  if (!ctx->presentation.object_count)
517  return 1;
518  sub->rects = av_mallocz_array(ctx->presentation.object_count, sizeof(*sub->rects));
519  if (!sub->rects) {
520  return AVERROR(ENOMEM);
521  }
522  palette = find_palette(ctx->presentation.palette_id, &ctx->palettes);
523  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  for (i = 0; i < ctx->presentation.object_count; i++) {
531  PGSSubObject *object;
532 
533  sub->rects[i] = av_mallocz(sizeof(*sub->rects[0]));
534  if (!sub->rects[i]) {
535  avsubtitle_free(sub);
536  return AVERROR(ENOMEM);
537  }
538  sub->num_rects++;
539  sub->rects[i]->type = SUBTITLE_BITMAP;
540 
541  /* Process bitmap */
542  object = find_object(ctx->presentation.objects[i].id, &ctx->objects);
543  if (!object) {
544  // Missing object. Should only happen with damaged streams.
545  av_log(avctx, AV_LOG_ERROR, "Invalid object id %d\n",
546  ctx->presentation.objects[i].id);
547  if (avctx->err_recognition & AV_EF_EXPLODE) {
548  avsubtitle_free(sub);
549  return AVERROR_INVALIDDATA;
550  }
551  // Leaves rect empty with 0 width and height.
552  continue;
553  }
554  if (ctx->presentation.objects[i].composition_flag & 0x40)
555  sub->rects[i]->flags |= AV_SUBTITLE_FLAG_FORCED;
556 
557  sub->rects[i]->x = ctx->presentation.objects[i].x;
558  sub->rects[i]->y = ctx->presentation.objects[i].y;
559  sub->rects[i]->w = object->w;
560  sub->rects[i]->h = object->h;
561 
562  sub->rects[i]->linesize[0] = object->w;
563 
564  if (object->rle) {
565  if (object->rle_remaining_len) {
566  av_log(avctx, AV_LOG_ERROR, "RLE data length %u is %u bytes shorter than expected\n",
567  object->rle_data_len, object->rle_remaining_len);
568  if (avctx->err_recognition & AV_EF_EXPLODE) {
569  avsubtitle_free(sub);
570  return AVERROR_INVALIDDATA;
571  }
572  }
573  ret = decode_rle(avctx, sub->rects[i], object->rle, object->rle_data_len);
574  if (ret < 0) {
575  if ((avctx->err_recognition & AV_EF_EXPLODE) ||
576  ret == AVERROR(ENOMEM)) {
577  avsubtitle_free(sub);
578  return ret;
579  }
580  sub->rects[i]->w = 0;
581  sub->rects[i]->h = 0;
582  continue;
583  }
584  }
585  /* Allocate memory for colors */
586  sub->rects[i]->nb_colors = 256;
587  sub->rects[i]->data[1] = av_mallocz(AVPALETTE_SIZE);
588  if (!sub->rects[i]->data[1]) {
589  avsubtitle_free(sub);
590  return AVERROR(ENOMEM);
591  }
592 
593  if (!ctx->forced_subs_only || ctx->presentation.objects[i].composition_flag & 0x40)
594  memcpy(sub->rects[i]->data[1], palette->clut, sub->rects[i]->nb_colors * sizeof(uint32_t));
595 
596 #if FF_API_AVPICTURE
598 {
600  int j;
601  rect = sub->rects[i];
602  for (j = 0; j < 4; j++) {
603  rect->pict.data[j] = rect->data[j];
604  rect->pict.linesize[j] = rect->linesize[j];
605  }
606 }
608 #endif
609  }
610  return 1;
611 }
612 
613 static int decode(AVCodecContext *avctx, void *data, int *data_size,
614  AVPacket *avpkt)
615 {
616  const uint8_t *buf = avpkt->data;
617  int buf_size = avpkt->size;
618 
619  const uint8_t *buf_end;
620  uint8_t segment_type;
621  int segment_length;
622  int i, ret;
623 
624  ff_dlog(avctx, "PGS sub packet:\n");
625 
626  for (i = 0; i < buf_size; i++) {
627  ff_dlog(avctx, "%02x ", buf[i]);
628  if (i % 16 == 15)
629  ff_dlog(avctx, "\n");
630  }
631 
632  if (i & 15)
633  ff_dlog(avctx, "\n");
634 
635  *data_size = 0;
636 
637  /* Ensure that we have received at a least a segment code and segment length */
638  if (buf_size < 3)
639  return -1;
640 
641  buf_end = buf + buf_size;
642 
643  /* Step through buffer to identify segments */
644  while (buf < buf_end) {
645  segment_type = bytestream_get_byte(&buf);
646  segment_length = bytestream_get_be16(&buf);
647 
648  ff_dlog(avctx, "Segment Length %d, Segment Type %x\n", segment_length, segment_type);
649 
650  if (segment_type != DISPLAY_SEGMENT && segment_length > buf_end - buf)
651  break;
652 
653  ret = 0;
654  switch (segment_type) {
655  case PALETTE_SEGMENT:
656  ret = parse_palette_segment(avctx, buf, segment_length);
657  break;
658  case OBJECT_SEGMENT:
659  ret = parse_object_segment(avctx, buf, segment_length);
660  break;
662  ret = parse_presentation_segment(avctx, buf, segment_length, ((AVSubtitle*)(data))->pts);
663  break;
664  case WINDOW_SEGMENT:
665  /*
666  * Window Segment Structure (No new information provided):
667  * 2 bytes: Unknown,
668  * 2 bytes: X position of subtitle,
669  * 2 bytes: Y position of subtitle,
670  * 2 bytes: Width of subtitle,
671  * 2 bytes: Height of subtitle.
672  */
673  break;
674  case DISPLAY_SEGMENT:
675  ret = display_end_segment(avctx, data, buf, segment_length);
676  if (ret >= 0)
677  *data_size = ret;
678  break;
679  default:
680  av_log(avctx, AV_LOG_ERROR, "Unknown subtitle segment type 0x%x, length %d\n",
681  segment_type, segment_length);
682  ret = AVERROR_INVALIDDATA;
683  break;
684  }
685  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
686  return ret;
687 
688  buf += segment_length;
689  }
690 
691  return buf_size;
692 }
693 
694 #define OFFSET(x) offsetof(PGSSubContext, x)
695 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
696 static const AVOption options[] = {
697  {"forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
698  { NULL },
699 };
700 
701 static const AVClass pgsdec_class = {
702  .class_name = "PGS subtitle decoder",
703  .item_name = av_default_item_name,
704  .option = options,
705  .version = LIBAVUTIL_VERSION_INT,
706 };
707 
709  .name = "pgssub",
710  .long_name = NULL_IF_CONFIG_SMALL("HDMV Presentation Graphic Stream subtitles"),
711  .type = AVMEDIA_TYPE_SUBTITLE,
713  .priv_data_size = sizeof(PGSSubContext),
714  .init = init_decoder,
715  .close = close_decoder,
716  .decode = decode,
717  .priv_class = &pgsdec_class,
718 };
static int parse_object_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Parse the picture segment packet.
Definition: pgssubdec.c:231
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3911
AVOption.
Definition: opt.h:245
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
enum AVCodecID id
Definition: mxfenc.c:104
#define OFFSET(x)
Definition: pgssubdec.c:694
misc image utilities
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static int parse_presentation_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int64_t pts)
Parse the presentation segment packet.
Definition: pgssubdec.c:385
#define YUV_TO_RGB1_CCIR(cb1, cr1)
Definition: colorspace.h:34
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:210
const char * g
Definition: vf_curves.c:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3915
int size
Definition: avcodec.h:1601
const char * b
Definition: vf_curves.c:113
#define MAX_NEG_CROP
Definition: mathops.h:30
Various defines for YUV<->RGB conversion.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1903
unsigned num_rects
Definition: avcodec.h:3949
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:120
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
uint8_t run
Definition: svq3.c:206
AVCodec ff_pgssub_decoder
Definition: pgssubdec.c:708
PGSSubPresentation presentation
Definition: pgssubdec.c:95
AVCodec.
Definition: avcodec.h:3589
attribute_deprecated AVPicture pict
Definition: avcodec.h:3922
#define MAX_OBJECT_REFS
Definition: pgssubdec.c:39
AVSubtitleRect ** rects
Definition: avcodec.h:3950
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3913
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
uint8_t composition_flag
Definition: pgssubdec.c:52
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:97
uint8_t
#define av_cold
Definition: attributes.h:82
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
AVOptions.
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:94
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3882
#define YUV_TO_RGB1_CCIR_BT709(cb1, cr1)
Definition: colorspace.h:44
PGSSubObjects objects
Definition: pgssubdec.c:97
#define height
uint8_t * data
Definition: avcodec.h:1600
static const AVClass pgsdec_class
Definition: pgssubdec.c:701
#define ff_dlog(a,...)
static int decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: pgssubdec.c:613
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:3914
#define av_log(a,...)
#define cm
Definition: dvbsubdec.c:36
static int parse_palette_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Parse the palette segment packet.
Definition: pgssubdec.c:323
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:99
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define RGBA(r, g, b, a)
Definition: pgssubdec.c:36
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3912
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * r
Definition: vf_curves.c:111
static int decode_rle(AVCodecContext *avctx, AVSubtitleRect *rect, const uint8_t *buf, unsigned int buf_size)
Decode the RLE data.
Definition: pgssubdec.c:161
const char * name
Name of the codec implementation.
Definition: avcodec.h:3596
static const AVOption options[]
Definition: pgssubdec.c:696
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:226
int forced_subs_only
Definition: pgssubdec.c:98
uint32_t end_display_time
Definition: avcodec.h:3948
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3951
PGSSubObject object[MAX_EPOCH_OBJECTS]
Definition: pgssubdec.c:80
A bitmap, pict will be set.
Definition: avcodec.h:3893
#define AV_SUBTITLE_FLAG_FORCED
Definition: avcodec.h:3908
int linesize[4]
Definition: avcodec.h:3929
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2963
static av_cold int close_decoder(AVCodecContext *avctx)
Definition: pgssubdec.c:144
#define width
int width
picture width / height.
Definition: avcodec.h:1862
static PGSSubObject * find_object(int id, PGSSubObjects *objects)
Definition: pgssubdec.c:115
AVFormatContext * ctx
Definition: movenc.c:48
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3880
uint16_t format
Definition: avcodec.h:3946
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2974
static av_cold int init_decoder(AVCodecContext *avctx)
Definition: pgssubdec.c:137
static int display_end_segment(AVCodecContext *avctx, void *data, const uint8_t *buf, int buf_size)
Parse the display segment packet.
Definition: pgssubdec.c:495
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:3928
#define MAX_EPOCH_OBJECTS
Definition: pgssubdec.c:38
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1675
static void flush_cache(AVCodecContext *avctx)
Definition: pgssubdec.c:101
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: utils.c:2710
void * buf
Definition: avisynth_c.h:690
Describe the class of an AVClass context structure.
Definition: log.h:67
Definition: f_ebur128.c:91
PGSSubPalette palette[MAX_EPOCH_PALETTES]
Definition: pgssubdec.c:90
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:55
PGSSubObjectRef objects[MAX_OBJECT_REFS]
Definition: pgssubdec.c:65
static struct @244 state
static int64_t pts
Global timestamp for the audio frames.
static int flags
Definition: cpu.c:47
int palette
Definition: v4l.c:61
uint32_t clut[256]
Definition: pgssubdec.c:85
unsigned int rle_remaining_len
Definition: pgssubdec.c:75
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:80
common internal api header.
unsigned int rle_data_len
Definition: pgssubdec.c:74
uint32_t start_display_time
Definition: avcodec.h:3947
#define ff_crop_tab
void * priv_data
Definition: avcodec.h:1717
static PGSSubPalette * find_palette(int id, PGSSubPalettes *palettes)
Definition: pgssubdec.c:126
uint8_t * rle
Definition: pgssubdec.c:73
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
unsigned int rle_buffer_size
Definition: pgssubdec.c:74
#define SD
Definition: pgssubdec.c:695
#define av_freep(p)
SegmentType
Definition: pgssubdec.c:41
#define av_malloc_array(a, b)
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:98
enum AVSubtitleType type
Definition: avcodec.h:3931
This structure stores compressed data.
Definition: avcodec.h:1577
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:242
#define MAX_EPOCH_PALETTES
Definition: pgssubdec.c:37
PGSSubPalettes palettes
Definition: pgssubdec.c:96