FFmpeg: libavcodec/pgssubdec.c Source File

FFmpeg
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 
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->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) {
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->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  */
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 || !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  object->rle_data_len = 0;
305  object->rle_remaining_len = 0;
306  return AVERROR(ENOMEM);
307  }
308 
309  memcpy(object->rle, buf, buf_size);
310  object->rle_data_len = buf_size;
311  object->rle_remaining_len = rle_bitmap_len - buf_size;
312 
313  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  static int parse_palette_segment(AVCodecContext *avctx,
327  const uint8_t *buf, int buf_size)
328 {
329  PGSSubContext *ctx = avctx->priv_data;
330  PGSSubPalette *palette;
331 
332  const uint8_t *buf_end = buf + buf_size;
333  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  id = bytestream_get_byte(&buf);
340  palette = find_palette(id, &ctx->palettes);
341  if (!palette) {
342  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  palette = &ctx->palettes.palette[ctx->palettes.count++];
347  palette->id = id;
348  }
349 
350  /* Skip palette version */
351  buf += 1;
352 
353  while (buf < buf_end) {
354  color_id = bytestream_get_byte(&buf);
355  y = bytestream_get_byte(&buf);
356  cr = bytestream_get_byte(&buf);
357  cb = bytestream_get_byte(&buf);
358  alpha = bytestream_get_byte(&buf);
359 
360  /* Default to BT.709 colorspace. In case of <= 576 height use BT.601 */
361  if (avctx->height <= 0 || avctx->height > 576) {
362  YUV_TO_RGB1_CCIR_BT709(cb, cr);
363  } else {
364  YUV_TO_RGB1_CCIR(cb, cr);
365  }
366 
367  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  palette->clut[color_id] = RGBA(r,g,b,alpha);
373  }
374  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  static int parse_presentation_segment(AVCodecContext *avctx,
389  const uint8_t *buf, int buf_size,
390  int64_t pts)
391 {
392  PGSSubContext *ctx = avctx->priv_data;
393  int i, state, ret;
394  const uint8_t *buf_end = buf + buf_size;
395 
396  // Video descriptor
397  int w = bytestream_get_be16(&buf);
398  int h = bytestream_get_be16(&buf);
399 
400  ctx->presentation.pts = pts;
401 
402  ff_dlog(avctx, "Video Dimensions %dx%d\n",
403  w, h);
404  ret = ff_set_dimensions(avctx, w, h);
405  if (ret < 0)
406  return ret;
407 
408  /* Skip 1 bytes of unknown, frame rate */
409  buf++;
410 
411  // Composition descriptor
412  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  state = bytestream_get_byte(&buf) >> 6;
423  if (state != 0) {
424  flush_cache(avctx);
425  }
426 
427  /*
428  * skip palette_update_flag (0x80),
429  */
430  buf += 1;
431  ctx->presentation.palette_id = bytestream_get_byte(&buf);
432  ctx->presentation.object_count = bytestream_get_byte(&buf);
433  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  for (i = 0; i < ctx->presentation.object_count; i++)
445  {
446 
447  if (buf_end - buf < 8) {
448  av_log(avctx, AV_LOG_ERROR, "Insufficent space for object\n");
449  ctx->presentation.object_count = i;
450  return AVERROR_INVALIDDATA;
451  }
452 
453  ctx->presentation.objects[i].id = bytestream_get_be16(&buf);
454  ctx->presentation.objects[i].window_id = bytestream_get_byte(&buf);
455  ctx->presentation.objects[i].composition_flag = bytestream_get_byte(&buf);
456 
457  ctx->presentation.objects[i].x = bytestream_get_be16(&buf);
458  ctx->presentation.objects[i].y = bytestream_get_be16(&buf);
459 
460  // If cropping
461  if (ctx->presentation.objects[i].composition_flag & 0x80) {
462  ctx->presentation.objects[i].crop_x = bytestream_get_be16(&buf);
463  ctx->presentation.objects[i].crop_y = bytestream_get_be16(&buf);
464  ctx->presentation.objects[i].crop_w = bytestream_get_be16(&buf);
465  ctx->presentation.objects[i].crop_h = bytestream_get_be16(&buf);
466  }
467 
468  ff_dlog(avctx, "Subtitle Placement x=%d, y=%d\n",
469  ctx->presentation.objects[i].x, ctx->presentation.objects[i].y);
470 
471  if (ctx->presentation.objects[i].x > avctx->width ||
472  ctx->presentation.objects[i].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  ctx->presentation.objects[i].x,
475  ctx->presentation.objects[i].y,
476  avctx->width, avctx->height);
477  ctx->presentation.objects[i].x = 0;
478  ctx->presentation.objects[i].y = 0;
479  if (avctx->err_recognition & AV_EF_EXPLODE) {
480  return AVERROR_INVALIDDATA;
481  }
482  }
483  }
484 
485  return 0;
486 }
487 
488 /**
489  * Parse the display segment packet.
490  *
491  * The display segment controls the updating of the display.
492  *
493  * @param avctx contains the current codec context
494  * @param data pointer to the data pertaining the subtitle to display
495  * @param buf pointer to the packet to process
496  * @param buf_size size of packet to process
497  */
498  static int display_end_segment(AVCodecContext *avctx, void *data,
499  const uint8_t *buf, int buf_size)
500 {
501  AVSubtitle *sub = data;
502  PGSSubContext *ctx = avctx->priv_data;
503  int64_t pts;
504  PGSSubPalette *palette;
505  int i, ret;
506 
507  pts = ctx->presentation.pts != AV_NOPTS_VALUE ? ctx->presentation.pts : sub->pts;
508  memset(sub, 0, sizeof(*sub));
509  sub->pts = pts;
510  ctx->presentation.pts = AV_NOPTS_VALUE;
511  sub->start_display_time = 0;
512  // There is no explicit end time for PGS subtitles. The end time
513  // is defined by the start of the next sub which may contain no
514  // objects (i.e. clears the previous sub)
515  sub->end_display_time = UINT32_MAX;
516  sub->format = 0;
517 
518  // Blank if last object_count was 0.
519  if (!ctx->presentation.object_count)
520  return 1;
521  sub->rects = av_mallocz_array(ctx->presentation.object_count, sizeof(*sub->rects));
522  if (!sub->rects) {
523  return AVERROR(ENOMEM);
524  }
525  palette = find_palette(ctx->presentation.palette_id, &ctx->palettes);
526  if (!palette) {
527  // Missing palette. Should only happen with damaged streams.
528  av_log(avctx, AV_LOG_ERROR, "Invalid palette id %d\n",
529  ctx->presentation.palette_id);
530  avsubtitle_free(sub);
531  return AVERROR_INVALIDDATA;
532  }
533  for (i = 0; i < ctx->presentation.object_count; i++) {
534  PGSSubObject *object;
535 
536  sub->rects[i] = av_mallocz(sizeof(*sub->rects[0]));
537  if (!sub->rects[i]) {
538  avsubtitle_free(sub);
539  return AVERROR(ENOMEM);
540  }
541  sub->num_rects++;
542  sub->rects[i]->type = SUBTITLE_BITMAP;
543 
544  /* Process bitmap */
545  object = find_object(ctx->presentation.objects[i].id, &ctx->objects);
546  if (!object) {
547  // Missing object. Should only happen with damaged streams.
548  av_log(avctx, AV_LOG_ERROR, "Invalid object id %d\n",
549  ctx->presentation.objects[i].id);
550  if (avctx->err_recognition & AV_EF_EXPLODE) {
551  avsubtitle_free(sub);
552  return AVERROR_INVALIDDATA;
553  }
554  // Leaves rect empty with 0 width and height.
555  continue;
556  }
557  if (ctx->presentation.objects[i].composition_flag & 0x40)
558  sub->rects[i]->flags |= AV_SUBTITLE_FLAG_FORCED;
559 
560  sub->rects[i]->x = ctx->presentation.objects[i].x;
561  sub->rects[i]->y = ctx->presentation.objects[i].y;
562 
563  if (object->rle) {
564  sub->rects[i]->w = object->w;
565  sub->rects[i]->h = object->h;
566 
567  sub->rects[i]->linesize[0] = object->w;
568 
569  if (object->rle_remaining_len) {
570  av_log(avctx, AV_LOG_ERROR, "RLE data length %u is %u bytes shorter than expected\n",
571  object->rle_data_len, object->rle_remaining_len);
572  if (avctx->err_recognition & AV_EF_EXPLODE) {
573  avsubtitle_free(sub);
574  return AVERROR_INVALIDDATA;
575  }
576  }
577  ret = decode_rle(avctx, sub->rects[i], object->rle, object->rle_data_len);
578  if (ret < 0) {
579  if ((avctx->err_recognition & AV_EF_EXPLODE) ||
580  ret == AVERROR(ENOMEM)) {
581  avsubtitle_free(sub);
582  return ret;
583  }
584  sub->rects[i]->w = 0;
585  sub->rects[i]->h = 0;
586  continue;
587  }
588  }
589  /* Allocate memory for colors */
590  sub->rects[i]->nb_colors = 256;
591  sub->rects[i]->data[1] = av_mallocz(AVPALETTE_SIZE);
592  if (!sub->rects[i]->data[1]) {
593  avsubtitle_free(sub);
594  return AVERROR(ENOMEM);
595  }
596 
597  if (!ctx->forced_subs_only || ctx->presentation.objects[i].composition_flag & 0x40)
598  memcpy(sub->rects[i]->data[1], palette->clut, sub->rects[i]->nb_colors * sizeof(uint32_t));
599 
600 #if FF_API_AVPICTURE
601 FF_DISABLE_DEPRECATION_WARNINGS
602 {
603  AVSubtitleRect *rect;
604  int j;
605  rect = sub->rects[i];
606  for (j = 0; j < 4; j++) {
607  rect->pict.data[j] = rect->data[j];
608  rect->pict.linesize[j] = rect->linesize[j];
609  }
610 }
611 FF_ENABLE_DEPRECATION_WARNINGS
612 #endif
613  }
614  return 1;
615 }
616 
617  static int decode(AVCodecContext *avctx, void *data, int *data_size,
618  AVPacket *avpkt)
619 {
620  const uint8_t *buf = avpkt->data;
621  int buf_size = avpkt->size;
622 
623  const uint8_t *buf_end;
624  uint8_t segment_type;
625  int segment_length;
626  int i, ret;
627 
628  ff_dlog(avctx, "PGS sub packet:\n");
629 
630  for (i = 0; i < buf_size; i++) {
631  ff_dlog(avctx, "%02x ", buf[i]);
632  if (i % 16 == 15)
633  ff_dlog(avctx, "\n");
634  }
635 
636  if (i & 15)
637  ff_dlog(avctx, "\n");
638 
639  *data_size = 0;
640 
641  /* Ensure that we have received at a least a segment code and segment length */
642  if (buf_size < 3)
643  return -1;
644 
645  buf_end = buf + buf_size;
646 
647  /* Step through buffer to identify segments */
648  while (buf < buf_end) {
649  segment_type = bytestream_get_byte(&buf);
650  segment_length = bytestream_get_be16(&buf);
651 
652  ff_dlog(avctx, "Segment Length %d, Segment Type %x\n", segment_length, segment_type);
653 
654  if (segment_type != DISPLAY_SEGMENT && segment_length > buf_end - buf)
655  break;
656 
657  ret = 0;
658  switch (segment_type) {
659  case PALETTE_SEGMENT:
660  ret = parse_palette_segment(avctx, buf, segment_length);
661  break;
662  case OBJECT_SEGMENT:
663  ret = parse_object_segment(avctx, buf, segment_length);
664  break;
665  case PRESENTATION_SEGMENT:
666  ret = parse_presentation_segment(avctx, buf, segment_length, ((AVSubtitle*)(data))->pts);
667  break;
668  case WINDOW_SEGMENT:
669  /*
670  * Window Segment Structure (No new information provided):
671  * 2 bytes: Unknown,
672  * 2 bytes: X position of subtitle,
673  * 2 bytes: Y position of subtitle,
674  * 2 bytes: Width of subtitle,
675  * 2 bytes: Height of subtitle.
676  */
677  break;
678  case DISPLAY_SEGMENT:
679  ret = display_end_segment(avctx, data, buf, segment_length);
680  if (ret >= 0)
681  *data_size = ret;
682  break;
683  default:
684  av_log(avctx, AV_LOG_ERROR, "Unknown subtitle segment type 0x%x, length %d\n",
685  segment_type, segment_length);
686  ret = AVERROR_INVALIDDATA;
687  break;
688  }
689  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
690  return ret;
691 
692  buf += segment_length;
693  }
694 
695  return buf_size;
696 }
697 
698  #define OFFSET(x) offsetof(PGSSubContext, x)
699  #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
700  static const AVOption options[] = {
701  {"forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
702  { NULL },
703 };
704 
705  static const AVClass pgsdec_class = {
706  .class_name = "PGS subtitle decoder",
707  .item_name = av_default_item_name,
708  .option = options,
709  .version = LIBAVUTIL_VERSION_INT,
710 };
711 
712  AVCodec ff_pgssub_decoder = {
713  .name = "pgssub",
714  .long_name = NULL_IF_CONFIG_SMALL("HDMV Presentation Graphic Stream subtitles"),
715  .type = AVMEDIA_TYPE_SUBTITLE,
716  .id = AV_CODEC_ID_HDMV_PGS_SUBTITLE,
717  .priv_data_size = sizeof(PGSSubContext),
718  .init = init_decoder,
719  .close = close_decoder,
720  .decode = decode,
721  .priv_class = &pgsdec_class,
722 };
parse_object_segment
static int parse_object_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Parse the picture segment packet.
Definition: pgssubdec.c:231
NULL
#define NULL
Definition: coverity.c:32
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
alpha
static float alpha(float a)
Definition: af_superequalizer.c:109
AVSubtitleRect::x
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3826
h
h
Definition: vp9dsp_template.c:2038
PGSSubObject::id
int id
Definition: pgssubdec.c:70
AVOption
AVOption.
Definition: opt.h:246
data
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
OFFSET
#define OFFSET(x)
Definition: pgssubdec.c:698
imgutils.h
misc image utilities
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
parse_presentation_segment
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:388
YUV_TO_RGB1_CCIR
#define YUV_TO_RGB1_CCIR(cb1, cr1)
Definition: colorspace.h:34
ff_set_dimensions
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:104
g
const char * g
Definition: vf_curves.c:112
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVSubtitleRect::nb_colors
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3830
AVPacket::size
int size
Definition: avcodec.h:1431
b
const char * b
Definition: vf_curves.c:113
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
MAX_NEG_CROP
#define MAX_NEG_CROP
Definition: mathops.h:31
colorspace.h
Various defines for YUV<->RGB conversion.
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1727
AVSubtitle::num_rects
unsigned num_rects
Definition: avcodec.h:3864
av_fast_padded_malloc
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:70
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
run
uint8_t run
Definition: svq3.c:206
ff_pgssub_decoder
AVCodec ff_pgssub_decoder
Definition: pgssubdec.c:712
PGSSubContext::presentation
PGSSubPresentation presentation
Definition: pgssubdec.c:95
AVCodec
AVCodec.
Definition: avcodec.h:3408
AVSubtitleRect::pict
attribute_deprecated AVPicture pict
Definition: avcodec.h:3837
MAX_OBJECT_REFS
#define MAX_OBJECT_REFS
Definition: pgssubdec.c:39
AVSubtitle::rects
AVSubtitleRect ** rects
Definition: avcodec.h:3865
AVSubtitleRect::w
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3828
AVClass::class_name
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
PGSSubObjectRef::composition_flag
uint8_t composition_flag
Definition: pgssubdec.c:52
cb
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:112
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:82
AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
opt.h
AVOptions.
color
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:92
AVPALETTE_SIZE
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
AVPicture::linesize
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3797
YUV_TO_RGB1_CCIR_BT709
#define YUV_TO_RGB1_CCIR_BT709(cb1, cr1)
Definition: colorspace.h:44
PGSSubContext::objects
PGSSubObjects objects
Definition: pgssubdec.c:97
height
#define height
AVPacket::data
uint8_t * data
Definition: avcodec.h:1430
pgsdec_class
static const AVClass pgsdec_class
Definition: pgssubdec.c:705
flags
static int flags
Definition: log.c:55
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
decode
static int decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: pgssubdec.c:617
AVSubtitleRect::h
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:3829
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
cm
#define cm
Definition: dvbsubdec.c:37
parse_palette_segment
static int parse_palette_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Parse the palette segment packet.
Definition: pgssubdec.c:326
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
RGBA
#define RGBA(r, g, b, a)
Definition: pgssubdec.c:36
AVSubtitleRect::y
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3827
AVERROR
#define AVERROR(e)
Definition: error.h:43
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
r
const char * r
Definition: vf_curves.c:111
decode_rle
static int decode_rle(AVCodecContext *avctx, AVSubtitleRect *rect, const uint8_t *buf, unsigned int buf_size)
Decode the RLE data.
Definition: pgssubdec.c:161
width
uint16_t width
Definition: gdv.c:47
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3415
options
static const AVOption options[]
Definition: pgssubdec.c:700
AV_CODEC_ID_HDMV_PGS_SUBTITLE
Definition: avcodec.h:649
PGSSubContext::forced_subs_only
int forced_subs_only
Definition: pgssubdec.c:98
AVSubtitle::end_display_time
uint32_t end_display_time
Definition: avcodec.h:3863
AVSubtitle::pts
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3866
PGSSubObjects::object
PGSSubObject object[MAX_EPOCH_OBJECTS]
Definition: pgssubdec.c:80
SUBTITLE_BITMAP
A bitmap, pict will be set.
Definition: avcodec.h:3808
AV_SUBTITLE_FLAG_FORCED
#define AV_SUBTITLE_FLAG_FORCED
Definition: avcodec.h:3823
AVSubtitleRect::linesize
int linesize[4]
Definition: avcodec.h:3844
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2642
close_decoder
static av_cold int close_decoder(AVCodecContext *avctx)
Definition: pgssubdec.c:144
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1690
w
uint8_t w
Definition: llviddspenc.c:38
find_object
static PGSSubObject * find_object(int id, PGSSubObjects *objects)
Definition: pgssubdec.c:115
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AV_OPT_TYPE_BOOL
Definition: opt.h:240
AVPicture::data
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3795
AVSubtitle::format
uint16_t format
Definition: avcodec.h:3861
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2653
init_decoder
static av_cold int init_decoder(AVCodecContext *avctx)
Definition: pgssubdec.c:137
state
static struct @271 state
display_end_segment
static int display_end_segment(AVCodecContext *avctx, void *data, const uint8_t *buf, int buf_size)
Parse the display segment packet.
Definition: pgssubdec.c:498
AVCodecContext::height
int height
Definition: avcodec.h:1690
AVSubtitleRect::data
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:3843
MAX_EPOCH_OBJECTS
#define MAX_EPOCH_OBJECTS
Definition: pgssubdec.c:38
PGSSubObjects::count
int count
Definition: pgssubdec.c:79
avcodec.h
Libavcodec external API header.
PGSSubObjectRef::window_id
int window_id
Definition: pgssubdec.c:51
AVCodecContext
main external API structure.
Definition: avcodec.h:1518
PGSSubPresentation::pts
int64_t pts
Definition: pgssubdec.c:66
flush_cache
static void flush_cache(AVCodecContext *avctx)
Definition: pgssubdec.c:101
avsubtitle_free
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: utils.c:1042
buf
void * buf
Definition: avisynth_c.h:690
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
rect
Definition: f_ebur128.c:91
PGSSubPalettes::palette
PGSSubPalette palette[MAX_EPOCH_PALETTES]
Definition: pgssubdec.c:90
YUV_TO_RGB2_CCIR
#define YUV_TO_RGB2_CCIR(r, g, b, y1)
Definition: colorspace.h:55
PGSSubPresentation::objects
PGSSubObjectRef objects[MAX_OBJECT_REFS]
Definition: pgssubdec.c:65
pts
static int64_t pts
Definition: transcode_aac.c:647
PGSSubPalette::clut
uint32_t clut[256]
Definition: pgssubdec.c:85
PGSSubObject::rle_remaining_len
unsigned int rle_remaining_len
Definition: pgssubdec.c:75
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
internal.h
common internal api header.
PGSSubObject::rle_data_len
unsigned int rle_data_len
Definition: pgssubdec.c:74
AVSubtitle::start_display_time
uint32_t start_display_time
Definition: avcodec.h:3862
ff_crop_tab
#define ff_crop_tab
Definition: motionpixels_tablegen.c:26
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1545
find_palette
static PGSSubPalette * find_palette(int id, PGSSubPalettes *palettes)
Definition: pgssubdec.c:126
PGSSubObject::rle
uint8_t * rle
Definition: pgssubdec.c:73
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
PGSSubObject::rle_buffer_size
unsigned int rle_buffer_size
Definition: pgssubdec.c:74
SD
#define SD
Definition: pgssubdec.c:699
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
SegmentType
SegmentType
Definition: pgssubdec.c:41
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
cr
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:113
AVSubtitleRect::type
enum AVSubtitleType type
Definition: avcodec.h:3846
AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:250
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1407
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
MAX_EPOCH_PALETTES
#define MAX_EPOCH_PALETTES
Definition: pgssubdec.c:37
PGSSubContext::palettes
PGSSubPalettes palettes
Definition: pgssubdec.c:96
av_mallocz_array
void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.c:191
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