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 DVBSubRegionDisplay *display_list;
240 DVBSubDisplayDefinition *display_definition;
244 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
246 DVBSubObject *ptr = ctx->object_list;
248 while (ptr && ptr->id != object_id) {
255 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
257 DVBSubCLUT *ptr = ctx->clut_list;
259 while (ptr && ptr->id != clut_id) {
266 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
268 DVBSubRegion *ptr = ctx->region_list;
270 while (ptr && ptr->id != region_id) {
277 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
279 DVBSubObject *object, *obj2, **obj2_ptr;
280 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
282 while (region->display_list) {
283 display = region->display_list;
285 object = get_object(ctx, display->object_id);
288 obj_disp_ptr = &object->display_list;
289 obj_disp = *obj_disp_ptr;
291 while (obj_disp && obj_disp != display) {
292 obj_disp_ptr = &obj_disp->object_list_next;
293 obj_disp = *obj_disp_ptr;
297 *obj_disp_ptr = obj_disp->object_list_next;
299 if (!object->display_list) {
300 obj2_ptr = &ctx->object_list;
303 while (obj2 != object) {
305 obj2_ptr = &obj2->next;
309 *obj2_ptr = obj2->next;
316 region->display_list = display->region_list_next;
323 static void delete_cluts(DVBSubContext *ctx)
327 while (ctx->clut_list) {
328 clut = ctx->clut_list;
330 ctx->clut_list = clut->next;
336 static void delete_objects(DVBSubContext *ctx)
338 DVBSubObject *object;
340 while (ctx->object_list) {
341 object = ctx->object_list;
343 ctx->object_list = object->next;
349 static void delete_regions(DVBSubContext *ctx)
351 DVBSubRegion *region;
353 while (ctx->region_list) {
354 region = ctx->region_list;
356 ctx->region_list = region->next;
358 delete_region_display_list(ctx, region);
360 av_free(region->pbuf);
365 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
367 int i, r, g, b, a = 0;
368 DVBSubContext *ctx = avctx->priv_data;
370 if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
371 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
372 ctx->composition_id = -1;
373 ctx->ancillary_id = -1;
375 if (avctx->extradata_size > 5) {
376 av_log(avctx, AV_LOG_WARNING, "Decoding first DVB subtitles sub-stream\n");
379 ctx->composition_id = AV_RB16(avctx->extradata);
380 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
385 default_clut.id = -1;
386 default_clut.next = NULL;
388 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
389 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
390 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
391 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
393 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
394 for (i = 1; i < 16; i++) {
396 r = (i & 1) ? 255 : 0;
397 g = (i & 2) ? 255 : 0;
398 b = (i & 4) ? 255 : 0;
400 r = (i & 1) ? 127 : 0;
401 g = (i & 2) ? 127 : 0;
402 b = (i & 4) ? 127 : 0;
404 default_clut.clut16[i] = RGBA(r, g, b, 255);
407 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
408 for (i = 1; i < 256; i++) {
410 r = (i & 1) ? 255 : 0;
411 g = (i & 2) ? 255 : 0;
412 b = (i & 4) ? 255 : 0;
417 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
418 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
419 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
423 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
424 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
425 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
429 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
430 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
431 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
435 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
436 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
437 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
442 default_clut.clut256[i] = RGBA(r, g, b, a);
448 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
450 DVBSubContext *ctx = avctx->priv_data;
451 DVBSubRegionDisplay *display;
459 av_freep(&ctx->display_definition);
461 while (ctx->display_list) {
462 display = ctx->display_list;
463 ctx->display_list = display->next;
471 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
472 const uint8_t **srcbuf, int buf_size,
473 int non_mod, uint8_t *map_table, int x_pos)
479 int pixels_read = x_pos;
481 init_get_bits(&gb, *srcbuf, buf_size << 3);
485 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
486 bits = get_bits(&gb, 2);
489 if (non_mod != 1 || bits != 1) {
491 *destbuf++ = map_table[bits];
497 bits = get_bits1(&gb);
499 run_length = get_bits(&gb, 3) + 3;
500 bits = get_bits(&gb, 2);
502 if (non_mod == 1 && bits == 1)
503 pixels_read += run_length;
506 bits = map_table[bits];
507 while (run_length-- > 0 && pixels_read < dbuf_len) {
513 bits = get_bits1(&gb);
515 bits = get_bits(&gb, 2);
517 run_length = get_bits(&gb, 4) + 12;
518 bits = get_bits(&gb, 2);
520 if (non_mod == 1 && bits == 1)
521 pixels_read += run_length;
524 bits = map_table[bits];
525 while (run_length-- > 0 && pixels_read < dbuf_len) {
530 } else if (bits == 3) {
531 run_length = get_bits(&gb, 8) + 29;
532 bits = get_bits(&gb, 2);
534 if (non_mod == 1 && bits == 1)
535 pixels_read += run_length;
538 bits = map_table[bits];
539 while (run_length-- > 0 && pixels_read < dbuf_len) {
544 } else if (bits == 1) {
550 while (run_length-- > 0 && pixels_read < dbuf_len) {
555 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
570 if (get_bits(&gb, 6))
571 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
573 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
578 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
579 const uint8_t **srcbuf, int buf_size,
580 int non_mod, uint8_t *map_table, int x_pos)
586 int pixels_read = x_pos;
588 init_get_bits(&gb, *srcbuf, buf_size << 3);
592 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
593 bits = get_bits(&gb, 4);
596 if (non_mod != 1 || bits != 1) {
598 *destbuf++ = map_table[bits];
604 bits = get_bits1(&gb);
606 run_length = get_bits(&gb, 3);
608 if (run_length == 0) {
609 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
620 while (run_length-- > 0 && pixels_read < dbuf_len) {
625 bits = get_bits1(&gb);
627 run_length = get_bits(&gb, 2) + 4;
628 bits = get_bits(&gb, 4);
630 if (non_mod == 1 && bits == 1)
631 pixels_read += run_length;
634 bits = map_table[bits];
635 while (run_length-- > 0 && pixels_read < dbuf_len) {
641 bits = get_bits(&gb, 2);
643 run_length = get_bits(&gb, 4) + 9;
644 bits = get_bits(&gb, 4);
646 if (non_mod == 1 && bits == 1)
647 pixels_read += run_length;
650 bits = map_table[bits];
651 while (run_length-- > 0 && pixels_read < dbuf_len) {
656 } else if (bits == 3) {
657 run_length = get_bits(&gb, 8) + 25;
658 bits = get_bits(&gb, 4);
660 if (non_mod == 1 && bits == 1)
661 pixels_read += run_length;
664 bits = map_table[bits];
665 while (run_length-- > 0 && pixels_read < dbuf_len) {
670 } else if (bits == 1) {
676 while (run_length-- > 0 && pixels_read < dbuf_len) {
693 if (get_bits(&gb, 8))
694 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
696 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
701 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
702 const uint8_t **srcbuf, int buf_size,
703 int non_mod, uint8_t *map_table, int x_pos)
705 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
708 int pixels_read = x_pos;
712 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
716 if (non_mod != 1 || bits != 1) {
718 *destbuf++ = map_table[bits];
725 run_length = bits & 0x7f;
726 if ((bits & 0x80) == 0) {
727 if (run_length == 0) {
735 while (run_length-- > 0 && pixels_read < dbuf_len) {
742 if (non_mod == 1 && bits == 1)
743 pixels_read += run_length;
745 bits = map_table[bits];
746 else while (run_length-- > 0 && pixels_read < dbuf_len) {
755 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
762 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
763 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
765 DVBSubContext *ctx = avctx->priv_data;
767 DVBSubRegion *region = get_region(ctx, display->region_id);
768 const uint8_t *buf_end = buf + buf_size;
773 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
774 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
775 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
776 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
780 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
781 top_bottom ? "bottom" : "top");
783 for (i = 0; i < buf_size; i++) {
785 av_dlog(avctx, "0x%8p: ", buf+i);
787 av_dlog(avctx, "%02x ", buf[i]);
789 av_dlog(avctx, "\n");
793 av_dlog(avctx, "\n");
802 x_pos = display->x_pos;
803 y_pos = display->y_pos;
807 while (buf < buf_end) {
808 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
809 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
815 if (region->depth == 8)
817 else if (region->depth == 4)
822 x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width),
823 region->width, &buf, buf_end - buf,
824 non_mod, map_table, x_pos);
827 if (region->depth < 4) {
828 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
832 if (region->depth == 8)
837 x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width),
838 region->width, &buf, buf_end - buf,
839 non_mod, map_table, x_pos);
842 if (region->depth < 8) {
843 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
847 x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width),
848 region->width, &buf, buf_end - buf,
849 non_mod, NULL, x_pos);
853 map2to4[0] = (*buf) >> 4;
854 map2to4[1] = (*buf++) & 0xf;
855 map2to4[2] = (*buf) >> 4;
856 map2to4[3] = (*buf++) & 0xf;
859 for (i = 0; i < 4; i++)
863 for (i = 0; i < 16; i++)
868 x_pos = display->x_pos;
872 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
878 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
879 const uint8_t *buf, int buf_size)
881 DVBSubContext *ctx = avctx->priv_data;
883 const uint8_t *buf_end = buf + buf_size;
885 DVBSubObject *object;
886 DVBSubObjectDisplay *display;
887 int top_field_len, bottom_field_len;
889 int coding_method, non_modifying_color;
891 object_id = AV_RB16(buf);
894 object = get_object(ctx, object_id);
899 coding_method = ((*buf) >> 2) & 3;
900 non_modifying_color = ((*buf++) >> 1) & 1;
902 if (coding_method == 0) {
903 top_field_len = AV_RB16(buf);
905 bottom_field_len = AV_RB16(buf);
908 if (buf + top_field_len + bottom_field_len > buf_end) {
909 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
913 for (display = object->display_list; display; display = display->object_list_next) {
914 const uint8_t *block = buf;
915 int bfl = bottom_field_len;
917 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
918 non_modifying_color);
920 if (bottom_field_len > 0)
921 block = buf + top_field_len;
925 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
926 non_modifying_color);
929 /* } else if (coding_method == 1) {*/
932 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
937 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
938 const uint8_t *buf, int buf_size)
940 DVBSubContext *ctx = avctx->priv_data;
942 const uint8_t *buf_end = buf + buf_size;
946 int entry_id, depth , full_range;
947 int y, cr, cb, alpha;
948 int r, g, b, r_add, g_add, b_add;
950 av_dlog(avctx, "DVB clut packet:\n");
952 for (i=0; i < buf_size; i++) {
953 av_dlog(avctx, "%02x ", buf[i]);
955 av_dlog(avctx, "\n");
959 av_dlog(avctx, "\n");
962 version = ((*buf)>>4)&15;
965 clut = get_clut(ctx, clut_id);
968 clut = av_malloc(sizeof(DVBSubCLUT));
970 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
975 clut->next = ctx->clut_list;
976 ctx->clut_list = clut;
979 if (clut->version != version) {
981 clut->version = version;
983 while (buf + 4 < buf_end) {
986 depth = (*buf) & 0xe0;
989 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
993 full_range = (*buf++) & 1;
1002 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1003 cb = (buf[1] << 2) & 0xf0;
1004 alpha = (buf[1] << 6) & 0xc0;
1012 YUV_TO_RGB1_CCIR(cb, cr);
1013 YUV_TO_RGB2_CCIR(r, g, b, y);
1015 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1016 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1017 av_dlog(avctx, "More than one bit level marked: %x\n", depth);
1018 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1019 return AVERROR_INVALIDDATA;
1023 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1024 else if (depth & 0x40)
1025 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1026 else if (depth & 0x20)
1027 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1034 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1035 const uint8_t *buf, int buf_size)
1037 DVBSubContext *ctx = avctx->priv_data;
1039 const uint8_t *buf_end = buf + buf_size;
1040 int region_id, object_id;
1041 int av_unused version;
1042 DVBSubRegion *region;
1043 DVBSubObject *object;
1044 DVBSubObjectDisplay *display;
1052 region = get_region(ctx, region_id);
1055 region = av_mallocz(sizeof(DVBSubRegion));
1057 region->id = region_id;
1058 region->version = -1;
1060 region->next = ctx->region_list;
1061 ctx->region_list = region;
1064 version = ((*buf)>>4) & 15;
1065 fill = ((*buf++) >> 3) & 1;
1067 region->width = AV_RB16(buf);
1069 region->height = AV_RB16(buf);
1072 if (region->width * region->height != region->buf_size) {
1073 av_free(region->pbuf);
1075 region->buf_size = region->width * region->height;
1077 region->pbuf = av_malloc(region->buf_size);
1083 region->depth = 1 << (((*buf++) >> 2) & 7);
1084 if(region->depth<2 || region->depth>8){
1085 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1088 region->clut = *buf++;
1090 if (region->depth == 8) {
1091 region->bgcolor = *buf++;
1096 if (region->depth == 4)
1097 region->bgcolor = (((*buf++) >> 4) & 15);
1099 region->bgcolor = (((*buf++) >> 2) & 3);
1102 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1105 memset(region->pbuf, region->bgcolor, region->buf_size);
1106 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1109 delete_region_display_list(ctx, region);
1111 while (buf + 5 < buf_end) {
1112 object_id = AV_RB16(buf);
1115 object = get_object(ctx, object_id);
1118 object = av_mallocz(sizeof(DVBSubObject));
1120 object->id = object_id;
1121 object->next = ctx->object_list;
1122 ctx->object_list = object;
1125 object->type = (*buf) >> 6;
1127 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1129 display->object_id = object_id;
1130 display->region_id = region_id;
1132 display->x_pos = AV_RB16(buf) & 0xfff;
1134 display->y_pos = AV_RB16(buf) & 0xfff;
1137 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1138 display->fgcolor = *buf++;
1139 display->bgcolor = *buf++;
1142 display->region_list_next = region->display_list;
1143 region->display_list = display;
1145 display->object_list_next = object->display_list;
1146 object->display_list = display;
1150 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1151 const uint8_t *buf, int buf_size)
1153 DVBSubContext *ctx = avctx->priv_data;
1154 DVBSubRegionDisplay *display;
1155 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1157 const uint8_t *buf_end = buf + buf_size;
1167 version = ((*buf)>>4) & 15;
1168 page_state = ((*buf++) >> 2) & 3;
1170 if (ctx->version != version) {
1172 ctx->time_out = timeout;
1173 ctx->version = version;
1175 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1177 if (page_state == 1 || page_state == 2) {
1178 delete_regions(ctx);
1179 delete_objects(ctx);
1183 tmp_display_list = ctx->display_list;
1184 ctx->display_list = NULL;
1186 while (buf + 5 < buf_end) {
1190 display = tmp_display_list;
1191 tmp_ptr = &tmp_display_list;
1193 while (display && display->region_id != region_id) {
1194 tmp_ptr = &display->next;
1195 display = display->next;
1199 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1201 display->region_id = region_id;
1203 display->x_pos = AV_RB16(buf);
1205 display->y_pos = AV_RB16(buf);
1208 *tmp_ptr = display->next;
1210 display->next = ctx->display_list;
1211 ctx->display_list = display;
1213 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1216 while (tmp_display_list) {
1217 display = tmp_display_list;
1219 tmp_display_list = display->next;
1229 static void save_display_set(DVBSubContext *ctx)
1231 DVBSubRegion *region;
1232 DVBSubRegionDisplay *display;
1234 uint32_t *clut_table;
1235 int x_pos, y_pos, width, height;
1236 int x, y, y_off, x_off;
1239 static int fileno_index = 0;
1246 for (display = ctx->display_list; display; display = display->next) {
1247 region = get_region(ctx, display->region_id);
1250 x_pos = display->x_pos;
1251 y_pos = display->y_pos;
1252 width = region->width;
1253 height = region->height;
1255 if (display->x_pos < x_pos) {
1256 width += (x_pos - display->x_pos);
1257 x_pos = display->x_pos;
1260 if (display->y_pos < y_pos) {
1261 height += (y_pos - display->y_pos);
1262 y_pos = display->y_pos;
1265 if (display->x_pos + region->width > x_pos + width) {
1266 width = display->x_pos + region->width - x_pos;
1269 if (display->y_pos + region->height > y_pos + height) {
1270 height = display->y_pos + region->height - y_pos;
1277 pbuf = av_malloc(width * height * 4);
1279 for (display = ctx->display_list; display; display = display->next) {
1280 region = get_region(ctx, display->region_id);
1282 x_off = display->x_pos - x_pos;
1283 y_off = display->y_pos - y_pos;
1285 clut = get_clut(ctx, region->clut);
1288 clut = &default_clut;
1290 switch (region->depth) {
1292 clut_table = clut->clut4;
1295 clut_table = clut->clut256;
1299 clut_table = clut->clut16;
1303 for (y = 0; y < region->height; y++) {
1304 for (x = 0; x < region->width; x++) {
1305 pbuf[((y + y_off) * width) + x_off + x] =
1306 clut_table[region->pbuf[y * region->width + x]];
1312 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1314 png_save2(filename, pbuf, width, height);
1323 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1327 DVBSubContext *ctx = avctx->priv_data;
1328 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1329 int dds_version, info_byte;
1334 info_byte = bytestream_get_byte(&buf);
1335 dds_version = info_byte >> 4;
1336 if (display_def && display_def->version == dds_version)
1337 return; // already have this display definition version
1340 display_def = av_mallocz(sizeof(*display_def));
1341 ctx->display_definition = display_def;
1346 display_def->version = dds_version;
1349 display_def->width = bytestream_get_be16(&buf) + 1;
1350 display_def->height = bytestream_get_be16(&buf) + 1;
1351 if (!avctx->width || !avctx->height) {
1352 avctx->width = display_def->width;
1353 avctx->height = display_def->height;
1359 if (info_byte & 1<<3) { // display_window_flag
1360 display_def->x = bytestream_get_be16(&buf);
1361 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1362 display_def->y = bytestream_get_be16(&buf);
1363 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1367 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1368 int buf_size, AVSubtitle *sub)
1370 DVBSubContext *ctx = avctx->priv_data;
1371 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1373 DVBSubRegion *region;
1374 DVBSubRegionDisplay *display;
1375 AVSubtitleRect *rect;
1377 uint32_t *clut_table;
1379 int offset_x=0, offset_y=0;
1381 sub->end_display_time = ctx->time_out * 1000;
1384 offset_x = display_def->x;
1385 offset_y = display_def->y;
1389 for (display = ctx->display_list; display; display = display->next)
1391 region = get_region(ctx, display->region_id);
1392 if (region && region->dirty)
1396 if (sub->num_rects > 0){
1397 sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);
1398 for(i=0; i<sub->num_rects; i++)
1399 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
1403 for (display = ctx->display_list; display; display = display->next) {
1404 region = get_region(ctx, display->region_id);
1412 rect = sub->rects[i];
1413 rect->x = display->x_pos + offset_x;
1414 rect->y = display->y_pos + offset_y;
1415 rect->w = region->width;
1416 rect->h = region->height;
1417 rect->nb_colors = (1 << region->depth);
1418 rect->type = SUBTITLE_BITMAP;
1419 rect->pict.linesize[0] = region->width;
1421 clut = get_clut(ctx, region->clut);
1424 clut = &default_clut;
1426 switch (region->depth) {
1428 clut_table = clut->clut4;
1431 clut_table = clut->clut256;
1435 clut_table = clut->clut16;
1439 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
1440 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
1442 rect->pict.data[0] = av_malloc(region->buf_size);
1443 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
1449 save_display_set(ctx);
1455 static int dvbsub_decode(AVCodecContext *avctx,
1456 void *data, int *data_size,
1459 const uint8_t *buf = avpkt->data;
1460 int buf_size = avpkt->size;
1461 DVBSubContext *ctx = avctx->priv_data;
1462 AVSubtitle *sub = data;
1463 const uint8_t *p, *p_end;
1469 int got_segment = 0;
1471 av_dlog(avctx, "DVB sub packet:\n");
1473 for (i=0; i < buf_size; i++) {
1474 av_dlog(avctx, "%02x ", buf[i]);
1476 av_dlog(avctx, "\n");
1480 av_dlog(avctx, "\n");
1482 if (buf_size <= 6 || *buf != 0x0f) {
1483 av_dlog(avctx, "incomplete or broken packet");
1488 p_end = buf + buf_size;
1490 while (p_end - p >= 6 && *p == 0x0f) {
1492 segment_type = *p++;
1493 page_id = AV_RB16(p);
1495 segment_length = AV_RB16(p);
1498 if (p_end - p < segment_length) {
1499 av_dlog(avctx, "incomplete or broken packet");
1503 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1504 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1505 switch (segment_type) {
1506 case DVBSUB_PAGE_SEGMENT:
1507 dvbsub_parse_page_segment(avctx, p, segment_length);
1510 case DVBSUB_REGION_SEGMENT:
1511 dvbsub_parse_region_segment(avctx, p, segment_length);
1514 case DVBSUB_CLUT_SEGMENT:
1515 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1516 if (ret < 0) return ret;
1519 case DVBSUB_OBJECT_SEGMENT:
1520 dvbsub_parse_object_segment(avctx, p, segment_length);
1523 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1524 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
1526 case DVBSUB_DISPLAY_SEGMENT:
1527 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1531 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1532 segment_type, page_id, segment_length);
1537 p += segment_length;
1539 // Some streams do not send a display segment but if we have all the other
1540 // segments then we need no further data.
1541 if (got_segment == 15 && sub)
1542 *data_size = dvbsub_display_end_segment(avctx, p, 0, sub);
1548 AVCodec ff_dvbsub_decoder = {
1550 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1551 .type = AVMEDIA_TYPE_SUBTITLE,
1552 .id = AV_CODEC_ID_DVB_SUBTITLE,
1553 .priv_data_size = sizeof(DVBSubContext),
1554 .init = dvbsub_init_decoder,
1555 .close = dvbsub_close_decoder,
1556 .decode = dvbsub_decode,