2 * DVB subtitle decoding
3 * Copyright (c) 2005 Ian Caulfield
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "bytestream.h"
25 #include "libavutil/colorspace.h"
27 #define DVBSUB_PAGE_SEGMENT 0x10
28 #define DVBSUB_REGION_SEGMENT 0x11
29 #define DVBSUB_CLUT_SEGMENT 0x12
30 #define DVBSUB_OBJECT_SEGMENT 0x13
31 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
32 #define DVBSUB_DISPLAY_SEGMENT 0x80
34 #define cm (ff_cropTbl + MAX_NEG_CROP)
38 static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
39 uint32_t *rgba_palette)
43 char fname[40], fname2[40];
46 snprintf(fname, 40, "%s.ppm", filename);
48 f = fopen(fname, "w");
57 for(y = 0; y < h; y++) {
58 for(x = 0; x < w; x++) {
59 v = rgba_palette[bitmap[y * w + x]];
60 putc((v >> 16) & 0xff, f);
61 putc((v >> 8) & 0xff, f);
62 putc((v >> 0) & 0xff, f);
68 snprintf(fname2, 40, "%s-a.pgm", filename);
70 f = fopen(fname2, "w");
79 for(y = 0; y < h; y++) {
80 for(x = 0; x < w; x++) {
81 v = rgba_palette[bitmap[y * w + x]];
82 putc((v >> 24) & 0xff, f);
87 snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
90 snprintf(command, 1024, "rm %s %s", fname, fname2);
95 static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
99 char fname[40], fname2[40];
102 snprintf(fname, sizeof(fname), "%s.ppm", filename);
104 f = fopen(fname, "w");
113 for(y = 0; y < h; y++) {
114 for(x = 0; x < w; x++) {
115 v = bitmap[y * w + x];
116 putc((v >> 16) & 0xff, f);
117 putc((v >> 8) & 0xff, f);
118 putc((v >> 0) & 0xff, f);
124 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
126 f = fopen(fname2, "w");
135 for(y = 0; y < h; y++) {
136 for(x = 0; x < w; x++) {
137 v = bitmap[y * w + x];
138 putc((v >> 24) & 0xff, f);
143 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
146 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
151 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
153 typedef struct DVBSubCLUT {
159 uint32_t clut256[256];
161 struct DVBSubCLUT *next;
164 static DVBSubCLUT default_clut;
166 typedef struct DVBSubObjectDisplay {
176 struct DVBSubObjectDisplay *region_list_next;
177 struct DVBSubObjectDisplay *object_list_next;
178 } DVBSubObjectDisplay;
180 typedef struct DVBSubObject {
186 DVBSubObjectDisplay *display_list;
188 struct DVBSubObject *next;
191 typedef struct DVBSubRegionDisplay {
197 struct DVBSubRegionDisplay *next;
198 } DVBSubRegionDisplay;
200 typedef struct DVBSubRegion {
215 DVBSubObjectDisplay *display_list;
217 struct DVBSubRegion *next;
220 typedef struct DVBSubDisplayDefinition {
227 } DVBSubDisplayDefinition;
229 typedef struct DVBSubContext {
235 DVBSubRegion *region_list;
236 DVBSubCLUT *clut_list;
237 DVBSubObject *object_list;
239 int display_list_size;
240 DVBSubRegionDisplay *display_list;
241 DVBSubDisplayDefinition *display_definition;
245 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
247 DVBSubObject *ptr = ctx->object_list;
249 while (ptr && ptr->id != object_id) {
256 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
258 DVBSubCLUT *ptr = ctx->clut_list;
260 while (ptr && ptr->id != clut_id) {
267 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
269 DVBSubRegion *ptr = ctx->region_list;
271 while (ptr && ptr->id != region_id) {
278 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
280 DVBSubObject *object, *obj2, **obj2_ptr;
281 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
283 while (region->display_list) {
284 display = region->display_list;
286 object = get_object(ctx, display->object_id);
289 obj_disp_ptr = &object->display_list;
290 obj_disp = *obj_disp_ptr;
292 while (obj_disp && obj_disp != display) {
293 obj_disp_ptr = &obj_disp->object_list_next;
294 obj_disp = *obj_disp_ptr;
298 *obj_disp_ptr = obj_disp->object_list_next;
300 if (!object->display_list) {
301 obj2_ptr = &ctx->object_list;
304 while (obj2 != object) {
306 obj2_ptr = &obj2->next;
310 *obj2_ptr = obj2->next;
317 region->display_list = display->region_list_next;
324 static void delete_cluts(DVBSubContext *ctx)
328 while (ctx->clut_list) {
329 clut = ctx->clut_list;
331 ctx->clut_list = clut->next;
337 static void delete_objects(DVBSubContext *ctx)
339 DVBSubObject *object;
341 while (ctx->object_list) {
342 object = ctx->object_list;
344 ctx->object_list = object->next;
350 static void delete_regions(DVBSubContext *ctx)
352 DVBSubRegion *region;
354 while (ctx->region_list) {
355 region = ctx->region_list;
357 ctx->region_list = region->next;
359 delete_region_display_list(ctx, region);
361 av_free(region->pbuf);
366 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
368 int i, r, g, b, a = 0;
369 DVBSubContext *ctx = avctx->priv_data;
371 if (!avctx->extradata || avctx->extradata_size != 4) {
372 av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
373 ctx->composition_id = -1;
374 ctx->ancillary_id = -1;
376 ctx->composition_id = AV_RB16(avctx->extradata);
377 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
382 default_clut.id = -1;
383 default_clut.next = NULL;
385 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
386 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
387 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
388 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
390 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
391 for (i = 1; i < 16; i++) {
393 r = (i & 1) ? 255 : 0;
394 g = (i & 2) ? 255 : 0;
395 b = (i & 4) ? 255 : 0;
397 r = (i & 1) ? 127 : 0;
398 g = (i & 2) ? 127 : 0;
399 b = (i & 4) ? 127 : 0;
401 default_clut.clut16[i] = RGBA(r, g, b, 255);
404 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
405 for (i = 1; i < 256; i++) {
407 r = (i & 1) ? 255 : 0;
408 g = (i & 2) ? 255 : 0;
409 b = (i & 4) ? 255 : 0;
414 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
415 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
416 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
420 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
421 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
422 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
426 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
427 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
428 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
432 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
433 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
434 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
439 default_clut.clut256[i] = RGBA(r, g, b, a);
445 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
447 DVBSubContext *ctx = avctx->priv_data;
448 DVBSubRegionDisplay *display;
456 av_freep(&ctx->display_definition);
458 while (ctx->display_list) {
459 display = ctx->display_list;
460 ctx->display_list = display->next;
468 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
469 const uint8_t **srcbuf, int buf_size,
470 int non_mod, uint8_t *map_table, int x_pos)
476 int pixels_read = x_pos;
478 init_get_bits(&gb, *srcbuf, buf_size << 3);
482 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
483 bits = get_bits(&gb, 2);
486 if (non_mod != 1 || bits != 1) {
488 *destbuf++ = map_table[bits];
494 bits = get_bits1(&gb);
496 run_length = get_bits(&gb, 3) + 3;
497 bits = get_bits(&gb, 2);
499 if (non_mod == 1 && bits == 1)
500 pixels_read += run_length;
503 bits = map_table[bits];
504 while (run_length-- > 0 && pixels_read < dbuf_len) {
510 bits = get_bits1(&gb);
512 bits = get_bits(&gb, 2);
514 run_length = get_bits(&gb, 4) + 12;
515 bits = get_bits(&gb, 2);
517 if (non_mod == 1 && bits == 1)
518 pixels_read += run_length;
521 bits = map_table[bits];
522 while (run_length-- > 0 && pixels_read < dbuf_len) {
527 } else if (bits == 3) {
528 run_length = get_bits(&gb, 8) + 29;
529 bits = get_bits(&gb, 2);
531 if (non_mod == 1 && bits == 1)
532 pixels_read += run_length;
535 bits = map_table[bits];
536 while (run_length-- > 0 && pixels_read < dbuf_len) {
541 } else if (bits == 1) {
547 while (run_length-- > 0 && pixels_read < dbuf_len) {
552 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
567 if (get_bits(&gb, 6))
568 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
570 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
575 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
576 const uint8_t **srcbuf, int buf_size,
577 int non_mod, uint8_t *map_table, int x_pos)
583 int pixels_read = x_pos;
585 init_get_bits(&gb, *srcbuf, buf_size << 3);
589 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
590 bits = get_bits(&gb, 4);
593 if (non_mod != 1 || bits != 1) {
595 *destbuf++ = map_table[bits];
601 bits = get_bits1(&gb);
603 run_length = get_bits(&gb, 3);
605 if (run_length == 0) {
606 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
617 while (run_length-- > 0 && pixels_read < dbuf_len) {
622 bits = get_bits1(&gb);
624 run_length = get_bits(&gb, 2) + 4;
625 bits = get_bits(&gb, 4);
627 if (non_mod == 1 && bits == 1)
628 pixels_read += run_length;
631 bits = map_table[bits];
632 while (run_length-- > 0 && pixels_read < dbuf_len) {
638 bits = get_bits(&gb, 2);
640 run_length = get_bits(&gb, 4) + 9;
641 bits = get_bits(&gb, 4);
643 if (non_mod == 1 && bits == 1)
644 pixels_read += run_length;
647 bits = map_table[bits];
648 while (run_length-- > 0 && pixels_read < dbuf_len) {
653 } else if (bits == 3) {
654 run_length = get_bits(&gb, 8) + 25;
655 bits = get_bits(&gb, 4);
657 if (non_mod == 1 && bits == 1)
658 pixels_read += run_length;
661 bits = map_table[bits];
662 while (run_length-- > 0 && pixels_read < dbuf_len) {
667 } else if (bits == 1) {
673 while (run_length-- > 0 && pixels_read < dbuf_len) {
690 if (get_bits(&gb, 8))
691 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
693 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
698 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
699 const uint8_t **srcbuf, int buf_size,
700 int non_mod, uint8_t *map_table, int x_pos)
702 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
705 int pixels_read = x_pos;
709 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
713 if (non_mod != 1 || bits != 1) {
715 *destbuf++ = map_table[bits];
722 run_length = bits & 0x7f;
723 if ((bits & 0x80) == 0) {
724 if (run_length == 0) {
732 while (run_length-- > 0 && pixels_read < dbuf_len) {
739 if (non_mod == 1 && bits == 1)
740 pixels_read += run_length;
742 bits = map_table[bits];
743 else while (run_length-- > 0 && pixels_read < dbuf_len) {
752 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
759 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
760 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
762 DVBSubContext *ctx = avctx->priv_data;
764 DVBSubRegion *region = get_region(ctx, display->region_id);
765 const uint8_t *buf_end = buf + buf_size;
770 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
771 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
772 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
773 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
777 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
778 top_bottom ? "bottom" : "top");
780 for (i = 0; i < buf_size; i++) {
782 av_dlog(avctx, "0x%8p: ", buf+i);
784 av_dlog(avctx, "%02x ", buf[i]);
786 av_dlog(avctx, "\n");
790 av_dlog(avctx, "\n");
799 x_pos = display->x_pos;
800 y_pos = display->y_pos;
804 while (buf < buf_end) {
805 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
806 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
812 if (region->depth == 8)
814 else if (region->depth == 4)
819 x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width),
820 region->width, &buf, buf_end - buf,
821 non_mod, map_table, x_pos);
824 if (region->depth < 4) {
825 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
829 if (region->depth == 8)
834 x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width),
835 region->width, &buf, buf_end - buf,
836 non_mod, map_table, x_pos);
839 if (region->depth < 8) {
840 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
844 x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width),
845 region->width, &buf, buf_end - buf,
846 non_mod, NULL, x_pos);
850 map2to4[0] = (*buf) >> 4;
851 map2to4[1] = (*buf++) & 0xf;
852 map2to4[2] = (*buf) >> 4;
853 map2to4[3] = (*buf++) & 0xf;
856 for (i = 0; i < 4; i++)
860 for (i = 0; i < 16; i++)
865 x_pos = display->x_pos;
869 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
875 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
876 const uint8_t *buf, int buf_size)
878 DVBSubContext *ctx = avctx->priv_data;
880 const uint8_t *buf_end = buf + buf_size;
882 DVBSubObject *object;
883 DVBSubObjectDisplay *display;
884 int top_field_len, bottom_field_len;
886 int coding_method, non_modifying_color;
888 object_id = AV_RB16(buf);
891 object = get_object(ctx, object_id);
896 coding_method = ((*buf) >> 2) & 3;
897 non_modifying_color = ((*buf++) >> 1) & 1;
899 if (coding_method == 0) {
900 top_field_len = AV_RB16(buf);
902 bottom_field_len = AV_RB16(buf);
905 if (buf + top_field_len + bottom_field_len > buf_end) {
906 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
910 for (display = object->display_list; display; display = display->object_list_next) {
911 const uint8_t *block = buf;
912 int bfl = bottom_field_len;
914 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
915 non_modifying_color);
917 if (bottom_field_len > 0)
918 block = buf + top_field_len;
922 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
923 non_modifying_color);
926 /* } else if (coding_method == 1) {*/
929 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
934 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
935 const uint8_t *buf, int buf_size)
937 DVBSubContext *ctx = avctx->priv_data;
939 const uint8_t *buf_end = buf + buf_size;
943 int entry_id, depth , full_range;
944 int y, cr, cb, alpha;
945 int r, g, b, r_add, g_add, b_add;
947 av_dlog(avctx, "DVB clut packet:\n");
949 for (i=0; i < buf_size; i++) {
950 av_dlog(avctx, "%02x ", buf[i]);
952 av_dlog(avctx, "\n");
956 av_dlog(avctx, "\n");
959 version = ((*buf)>>4)&15;
962 clut = get_clut(ctx, clut_id);
965 clut = av_malloc(sizeof(DVBSubCLUT));
967 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
972 clut->next = ctx->clut_list;
973 ctx->clut_list = clut;
976 if (clut->version != version) {
978 clut->version = version;
980 while (buf + 4 < buf_end) {
983 depth = (*buf) & 0xe0;
986 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
990 full_range = (*buf++) & 1;
999 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1000 cb = (buf[1] << 2) & 0xf0;
1001 alpha = (buf[1] << 6) & 0xc0;
1009 YUV_TO_RGB1_CCIR(cb, cr);
1010 YUV_TO_RGB2_CCIR(r, g, b, y);
1012 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1013 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1014 av_dlog(avctx, "More than one bit level marked: %x\n", depth);
1015 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1016 return AVERROR_INVALIDDATA;
1020 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1021 else if (depth & 0x40)
1022 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1023 else if (depth & 0x20)
1024 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1031 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1032 const uint8_t *buf, int buf_size)
1034 DVBSubContext *ctx = avctx->priv_data;
1036 const uint8_t *buf_end = buf + buf_size;
1037 int region_id, object_id;
1038 int av_unused version;
1039 DVBSubRegion *region;
1040 DVBSubObject *object;
1041 DVBSubObjectDisplay *display;
1049 region = get_region(ctx, region_id);
1052 region = av_mallocz(sizeof(DVBSubRegion));
1054 region->id = region_id;
1055 region->version = -1;
1057 region->next = ctx->region_list;
1058 ctx->region_list = region;
1061 version = ((*buf)>>4) & 15;
1062 fill = ((*buf++) >> 3) & 1;
1064 region->width = AV_RB16(buf);
1066 region->height = AV_RB16(buf);
1069 if (region->width * region->height != region->buf_size) {
1070 av_free(region->pbuf);
1072 region->buf_size = region->width * region->height;
1074 region->pbuf = av_malloc(region->buf_size);
1080 region->depth = 1 << (((*buf++) >> 2) & 7);
1081 if(region->depth<2 || region->depth>8){
1082 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1085 region->clut = *buf++;
1087 if (region->depth == 8) {
1088 region->bgcolor = *buf++;
1093 if (region->depth == 4)
1094 region->bgcolor = (((*buf++) >> 4) & 15);
1096 region->bgcolor = (((*buf++) >> 2) & 3);
1099 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1102 memset(region->pbuf, region->bgcolor, region->buf_size);
1103 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1106 delete_region_display_list(ctx, region);
1108 while (buf + 5 < buf_end) {
1109 object_id = AV_RB16(buf);
1112 object = get_object(ctx, object_id);
1115 object = av_mallocz(sizeof(DVBSubObject));
1117 object->id = object_id;
1118 object->next = ctx->object_list;
1119 ctx->object_list = object;
1122 object->type = (*buf) >> 6;
1124 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1126 display->object_id = object_id;
1127 display->region_id = region_id;
1129 display->x_pos = AV_RB16(buf) & 0xfff;
1131 display->y_pos = AV_RB16(buf) & 0xfff;
1134 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1135 display->fgcolor = *buf++;
1136 display->bgcolor = *buf++;
1139 display->region_list_next = region->display_list;
1140 region->display_list = display;
1142 display->object_list_next = object->display_list;
1143 object->display_list = display;
1147 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1148 const uint8_t *buf, int buf_size)
1150 DVBSubContext *ctx = avctx->priv_data;
1151 DVBSubRegionDisplay *display;
1152 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1154 const uint8_t *buf_end = buf + buf_size;
1164 version = ((*buf)>>4) & 15;
1165 page_state = ((*buf++) >> 2) & 3;
1167 if (ctx->version != version) {
1169 ctx->time_out = timeout;
1170 ctx->version = version;
1172 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1174 if (page_state == 1 || page_state == 2) {
1175 delete_regions(ctx);
1176 delete_objects(ctx);
1180 tmp_display_list = ctx->display_list;
1181 ctx->display_list = NULL;
1182 ctx->display_list_size = 0;
1184 while (buf + 5 < buf_end) {
1188 display = tmp_display_list;
1189 tmp_ptr = &tmp_display_list;
1191 while (display && display->region_id != region_id) {
1192 tmp_ptr = &display->next;
1193 display = display->next;
1197 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1199 display->region_id = region_id;
1201 display->x_pos = AV_RB16(buf);
1203 display->y_pos = AV_RB16(buf);
1206 *tmp_ptr = display->next;
1208 display->next = ctx->display_list;
1209 ctx->display_list = display;
1210 ctx->display_list_size++;
1212 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1215 while (tmp_display_list) {
1216 display = tmp_display_list;
1218 tmp_display_list = display->next;
1228 static void save_display_set(DVBSubContext *ctx)
1230 DVBSubRegion *region;
1231 DVBSubRegionDisplay *display;
1233 uint32_t *clut_table;
1234 int x_pos, y_pos, width, height;
1235 int x, y, y_off, x_off;
1238 static int fileno_index = 0;
1245 for (display = ctx->display_list; display; display = display->next) {
1246 region = get_region(ctx, display->region_id);
1249 x_pos = display->x_pos;
1250 y_pos = display->y_pos;
1251 width = region->width;
1252 height = region->height;
1254 if (display->x_pos < x_pos) {
1255 width += (x_pos - display->x_pos);
1256 x_pos = display->x_pos;
1259 if (display->y_pos < y_pos) {
1260 height += (y_pos - display->y_pos);
1261 y_pos = display->y_pos;
1264 if (display->x_pos + region->width > x_pos + width) {
1265 width = display->x_pos + region->width - x_pos;
1268 if (display->y_pos + region->height > y_pos + height) {
1269 height = display->y_pos + region->height - y_pos;
1276 pbuf = av_malloc(width * height * 4);
1278 for (display = ctx->display_list; display; display = display->next) {
1279 region = get_region(ctx, display->region_id);
1281 x_off = display->x_pos - x_pos;
1282 y_off = display->y_pos - y_pos;
1284 clut = get_clut(ctx, region->clut);
1287 clut = &default_clut;
1289 switch (region->depth) {
1291 clut_table = clut->clut4;
1294 clut_table = clut->clut256;
1298 clut_table = clut->clut16;
1302 for (y = 0; y < region->height; y++) {
1303 for (x = 0; x < region->width; x++) {
1304 pbuf[((y + y_off) * width) + x_off + x] =
1305 clut_table[region->pbuf[y * region->width + x]];
1311 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1313 png_save2(filename, pbuf, width, height);
1322 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1326 DVBSubContext *ctx = avctx->priv_data;
1327 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1328 int dds_version, info_byte;
1333 info_byte = bytestream_get_byte(&buf);
1334 dds_version = info_byte >> 4;
1335 if (display_def && display_def->version == dds_version)
1336 return; // already have this display definition version
1339 display_def = av_mallocz(sizeof(*display_def));
1340 ctx->display_definition = display_def;
1345 display_def->version = dds_version;
1348 display_def->width = bytestream_get_be16(&buf) + 1;
1349 display_def->height = bytestream_get_be16(&buf) + 1;
1350 if (!avctx->width || !avctx->height) {
1351 avctx->width = display_def->width;
1352 avctx->height = display_def->height;
1358 if (info_byte & 1<<3) { // display_window_flag
1359 display_def->x = bytestream_get_be16(&buf);
1360 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1361 display_def->y = bytestream_get_be16(&buf);
1362 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1366 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1367 int buf_size, AVSubtitle *sub)
1369 DVBSubContext *ctx = avctx->priv_data;
1370 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1372 DVBSubRegion *region;
1373 DVBSubRegionDisplay *display;
1374 AVSubtitleRect *rect;
1376 uint32_t *clut_table;
1378 int offset_x=0, offset_y=0;
1380 sub->end_display_time = ctx->time_out * 1000;
1383 offset_x = display_def->x;
1384 offset_y = display_def->y;
1387 sub->num_rects = ctx->display_list_size;
1389 if (sub->num_rects > 0){
1390 sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);
1391 for(i=0; i<sub->num_rects; i++)
1392 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
1396 for (display = ctx->display_list; display; display = display->next) {
1397 region = get_region(ctx, display->region_id);
1405 rect = sub->rects[i];
1406 rect->x = display->x_pos + offset_x;
1407 rect->y = display->y_pos + offset_y;
1408 rect->w = region->width;
1409 rect->h = region->height;
1410 rect->nb_colors = (1 << region->depth);
1411 rect->type = SUBTITLE_BITMAP;
1412 rect->pict.linesize[0] = region->width;
1414 clut = get_clut(ctx, region->clut);
1417 clut = &default_clut;
1419 switch (region->depth) {
1421 clut_table = clut->clut4;
1424 clut_table = clut->clut256;
1428 clut_table = clut->clut16;
1432 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
1433 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
1435 rect->pict.data[0] = av_malloc(region->buf_size);
1436 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
1444 save_display_set(ctx);
1450 static int dvbsub_decode(AVCodecContext *avctx,
1451 void *data, int *data_size,
1454 const uint8_t *buf = avpkt->data;
1455 int buf_size = avpkt->size;
1456 DVBSubContext *ctx = avctx->priv_data;
1457 AVSubtitle *sub = data;
1458 const uint8_t *p, *p_end;
1464 int got_segment = 0;
1466 av_dlog(avctx, "DVB sub packet:\n");
1468 for (i=0; i < buf_size; i++) {
1469 av_dlog(avctx, "%02x ", buf[i]);
1471 av_dlog(avctx, "\n");
1475 av_dlog(avctx, "\n");
1477 if (buf_size <= 6 || *buf != 0x0f) {
1478 av_dlog(avctx, "incomplete or broken packet");
1483 p_end = buf + buf_size;
1485 while (p_end - p >= 6 && *p == 0x0f) {
1487 segment_type = *p++;
1488 page_id = AV_RB16(p);
1490 segment_length = AV_RB16(p);
1493 if (p_end - p < segment_length) {
1494 av_dlog(avctx, "incomplete or broken packet");
1498 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1499 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1500 switch (segment_type) {
1501 case DVBSUB_PAGE_SEGMENT:
1502 dvbsub_parse_page_segment(avctx, p, segment_length);
1505 case DVBSUB_REGION_SEGMENT:
1506 dvbsub_parse_region_segment(avctx, p, segment_length);
1509 case DVBSUB_CLUT_SEGMENT:
1510 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1511 if (ret < 0) return ret;
1514 case DVBSUB_OBJECT_SEGMENT:
1515 dvbsub_parse_object_segment(avctx, p, segment_length);
1518 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1519 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
1521 case DVBSUB_DISPLAY_SEGMENT:
1522 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1526 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1527 segment_type, page_id, segment_length);
1532 p += segment_length;
1534 // Some streams do not send a display segment but if we have all the other
1535 // segments then we need no further data.
1536 if (got_segment == 15 && sub)
1537 *data_size = dvbsub_display_end_segment(avctx, p, 0, sub);
1543 AVCodec ff_dvbsub_decoder = {
1545 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1546 .type = AVMEDIA_TYPE_SUBTITLE,
1547 .id = AV_CODEC_ID_DVB_SUBTITLE,
1548 .priv_data_size = sizeof(DVBSubContext),
1549 .init = dvbsub_init_decoder,
1550 .close = dvbsub_close_decoder,
1551 .decode = dvbsub_decode,