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) {
371 av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
372 ctx->composition_id = -1;
373 ctx->ancillary_id = -1;
375 ctx->composition_id = AV_RB16(avctx->extradata);
376 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
381 default_clut.id = -1;
382 default_clut.next = NULL;
384 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
385 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
386 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
387 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
389 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
390 for (i = 1; i < 16; i++) {
392 r = (i & 1) ? 255 : 0;
393 g = (i & 2) ? 255 : 0;
394 b = (i & 4) ? 255 : 0;
396 r = (i & 1) ? 127 : 0;
397 g = (i & 2) ? 127 : 0;
398 b = (i & 4) ? 127 : 0;
400 default_clut.clut16[i] = RGBA(r, g, b, 255);
403 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
404 for (i = 1; i < 256; i++) {
406 r = (i & 1) ? 255 : 0;
407 g = (i & 2) ? 255 : 0;
408 b = (i & 4) ? 255 : 0;
413 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
414 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
415 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
419 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
420 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
421 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
425 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
426 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
427 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
431 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
432 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
433 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
438 default_clut.clut256[i] = RGBA(r, g, b, a);
444 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
446 DVBSubContext *ctx = avctx->priv_data;
447 DVBSubRegionDisplay *display;
455 av_freep(&ctx->display_definition);
457 while (ctx->display_list) {
458 display = ctx->display_list;
459 ctx->display_list = display->next;
467 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
468 const uint8_t **srcbuf, int buf_size,
469 int non_mod, uint8_t *map_table, int x_pos)
475 int pixels_read = x_pos;
477 init_get_bits(&gb, *srcbuf, buf_size << 3);
481 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
482 bits = get_bits(&gb, 2);
485 if (non_mod != 1 || bits != 1) {
487 *destbuf++ = map_table[bits];
493 bits = get_bits1(&gb);
495 run_length = get_bits(&gb, 3) + 3;
496 bits = get_bits(&gb, 2);
498 if (non_mod == 1 && bits == 1)
499 pixels_read += run_length;
502 bits = map_table[bits];
503 while (run_length-- > 0 && pixels_read < dbuf_len) {
509 bits = get_bits1(&gb);
511 bits = get_bits(&gb, 2);
513 run_length = get_bits(&gb, 4) + 12;
514 bits = get_bits(&gb, 2);
516 if (non_mod == 1 && bits == 1)
517 pixels_read += run_length;
520 bits = map_table[bits];
521 while (run_length-- > 0 && pixels_read < dbuf_len) {
526 } else if (bits == 3) {
527 run_length = get_bits(&gb, 8) + 29;
528 bits = get_bits(&gb, 2);
530 if (non_mod == 1 && bits == 1)
531 pixels_read += run_length;
534 bits = map_table[bits];
535 while (run_length-- > 0 && pixels_read < dbuf_len) {
540 } else if (bits == 1) {
546 while (run_length-- > 0 && pixels_read < dbuf_len) {
551 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
566 if (get_bits(&gb, 6))
567 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
569 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
574 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
575 const uint8_t **srcbuf, int buf_size,
576 int non_mod, uint8_t *map_table, int x_pos)
582 int pixels_read = x_pos;
584 init_get_bits(&gb, *srcbuf, buf_size << 3);
588 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
589 bits = get_bits(&gb, 4);
592 if (non_mod != 1 || bits != 1) {
594 *destbuf++ = map_table[bits];
600 bits = get_bits1(&gb);
602 run_length = get_bits(&gb, 3);
604 if (run_length == 0) {
605 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
616 while (run_length-- > 0 && pixels_read < dbuf_len) {
621 bits = get_bits1(&gb);
623 run_length = get_bits(&gb, 2) + 4;
624 bits = get_bits(&gb, 4);
626 if (non_mod == 1 && bits == 1)
627 pixels_read += run_length;
630 bits = map_table[bits];
631 while (run_length-- > 0 && pixels_read < dbuf_len) {
637 bits = get_bits(&gb, 2);
639 run_length = get_bits(&gb, 4) + 9;
640 bits = get_bits(&gb, 4);
642 if (non_mod == 1 && bits == 1)
643 pixels_read += run_length;
646 bits = map_table[bits];
647 while (run_length-- > 0 && pixels_read < dbuf_len) {
652 } else if (bits == 3) {
653 run_length = get_bits(&gb, 8) + 25;
654 bits = get_bits(&gb, 4);
656 if (non_mod == 1 && bits == 1)
657 pixels_read += run_length;
660 bits = map_table[bits];
661 while (run_length-- > 0 && pixels_read < dbuf_len) {
666 } else if (bits == 1) {
672 while (run_length-- > 0 && pixels_read < dbuf_len) {
689 if (get_bits(&gb, 8))
690 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
692 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
697 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
698 const uint8_t **srcbuf, int buf_size,
699 int non_mod, uint8_t *map_table, int x_pos)
701 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
704 int pixels_read = x_pos;
708 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
712 if (non_mod != 1 || bits != 1) {
714 *destbuf++ = map_table[bits];
721 run_length = bits & 0x7f;
722 if ((bits & 0x80) == 0) {
723 if (run_length == 0) {
731 while (run_length-- > 0 && pixels_read < dbuf_len) {
738 if (non_mod == 1 && bits == 1)
739 pixels_read += run_length;
741 bits = map_table[bits];
742 else while (run_length-- > 0 && pixels_read < dbuf_len) {
751 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
758 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
759 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
761 DVBSubContext *ctx = avctx->priv_data;
763 DVBSubRegion *region = get_region(ctx, display->region_id);
764 const uint8_t *buf_end = buf + buf_size;
769 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
770 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
771 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
772 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
776 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
777 top_bottom ? "bottom" : "top");
779 for (i = 0; i < buf_size; i++) {
781 av_dlog(avctx, "0x%8p: ", buf+i);
783 av_dlog(avctx, "%02x ", buf[i]);
785 av_dlog(avctx, "\n");
789 av_dlog(avctx, "\n");
798 x_pos = display->x_pos;
799 y_pos = display->y_pos;
803 while (buf < buf_end) {
804 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
805 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
811 if (region->depth == 8)
813 else if (region->depth == 4)
818 x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width),
819 region->width, &buf, buf_end - buf,
820 non_mod, map_table, x_pos);
823 if (region->depth < 4) {
824 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
828 if (region->depth == 8)
833 x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width),
834 region->width, &buf, buf_end - buf,
835 non_mod, map_table, x_pos);
838 if (region->depth < 8) {
839 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
843 x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width),
844 region->width, &buf, buf_end - buf,
845 non_mod, NULL, x_pos);
849 map2to4[0] = (*buf) >> 4;
850 map2to4[1] = (*buf++) & 0xf;
851 map2to4[2] = (*buf) >> 4;
852 map2to4[3] = (*buf++) & 0xf;
855 for (i = 0; i < 4; i++)
859 for (i = 0; i < 16; i++)
864 x_pos = display->x_pos;
868 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
874 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
875 const uint8_t *buf, int buf_size)
877 DVBSubContext *ctx = avctx->priv_data;
879 const uint8_t *buf_end = buf + buf_size;
881 DVBSubObject *object;
882 DVBSubObjectDisplay *display;
883 int top_field_len, bottom_field_len;
885 int coding_method, non_modifying_color;
887 object_id = AV_RB16(buf);
890 object = get_object(ctx, object_id);
895 coding_method = ((*buf) >> 2) & 3;
896 non_modifying_color = ((*buf++) >> 1) & 1;
898 if (coding_method == 0) {
899 top_field_len = AV_RB16(buf);
901 bottom_field_len = AV_RB16(buf);
904 if (buf + top_field_len + bottom_field_len > buf_end) {
905 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
909 for (display = object->display_list; display; display = display->object_list_next) {
910 const uint8_t *block = buf;
911 int bfl = bottom_field_len;
913 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
914 non_modifying_color);
916 if (bottom_field_len > 0)
917 block = buf + top_field_len;
921 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
922 non_modifying_color);
925 /* } else if (coding_method == 1) {*/
928 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
933 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
934 const uint8_t *buf, int buf_size)
936 DVBSubContext *ctx = avctx->priv_data;
938 const uint8_t *buf_end = buf + buf_size;
942 int entry_id, depth , full_range;
943 int y, cr, cb, alpha;
944 int r, g, b, r_add, g_add, b_add;
946 av_dlog(avctx, "DVB clut packet:\n");
948 for (i=0; i < buf_size; i++) {
949 av_dlog(avctx, "%02x ", buf[i]);
951 av_dlog(avctx, "\n");
955 av_dlog(avctx, "\n");
958 version = ((*buf)>>4)&15;
961 clut = get_clut(ctx, clut_id);
964 clut = av_malloc(sizeof(DVBSubCLUT));
966 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
971 clut->next = ctx->clut_list;
972 ctx->clut_list = clut;
975 if (clut->version != version) {
977 clut->version = version;
979 while (buf + 4 < buf_end) {
982 depth = (*buf) & 0xe0;
985 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
989 full_range = (*buf++) & 1;
998 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
999 cb = (buf[1] << 2) & 0xf0;
1000 alpha = (buf[1] << 6) & 0xc0;
1008 YUV_TO_RGB1_CCIR(cb, cr);
1009 YUV_TO_RGB2_CCIR(r, g, b, y);
1011 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1012 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1013 av_dlog(avctx, "More than one bit level marked: %x\n", depth);
1014 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1015 return AVERROR_INVALIDDATA;
1019 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1020 else if (depth & 0x40)
1021 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1022 else if (depth & 0x20)
1023 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1030 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1031 const uint8_t *buf, int buf_size)
1033 DVBSubContext *ctx = avctx->priv_data;
1035 const uint8_t *buf_end = buf + buf_size;
1036 int region_id, object_id;
1037 int av_unused version;
1038 DVBSubRegion *region;
1039 DVBSubObject *object;
1040 DVBSubObjectDisplay *display;
1048 region = get_region(ctx, region_id);
1051 region = av_mallocz(sizeof(DVBSubRegion));
1053 region->id = region_id;
1054 region->version = -1;
1056 region->next = ctx->region_list;
1057 ctx->region_list = region;
1060 version = ((*buf)>>4) & 15;
1061 fill = ((*buf++) >> 3) & 1;
1063 region->width = AV_RB16(buf);
1065 region->height = AV_RB16(buf);
1068 if (region->width * region->height != region->buf_size) {
1069 av_free(region->pbuf);
1071 region->buf_size = region->width * region->height;
1073 region->pbuf = av_malloc(region->buf_size);
1079 region->depth = 1 << (((*buf++) >> 2) & 7);
1080 if(region->depth<2 || region->depth>8){
1081 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1084 region->clut = *buf++;
1086 if (region->depth == 8) {
1087 region->bgcolor = *buf++;
1092 if (region->depth == 4)
1093 region->bgcolor = (((*buf++) >> 4) & 15);
1095 region->bgcolor = (((*buf++) >> 2) & 3);
1098 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1101 memset(region->pbuf, region->bgcolor, region->buf_size);
1102 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1105 delete_region_display_list(ctx, region);
1107 while (buf + 5 < buf_end) {
1108 object_id = AV_RB16(buf);
1111 object = get_object(ctx, object_id);
1114 object = av_mallocz(sizeof(DVBSubObject));
1116 object->id = object_id;
1117 object->next = ctx->object_list;
1118 ctx->object_list = object;
1121 object->type = (*buf) >> 6;
1123 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1125 display->object_id = object_id;
1126 display->region_id = region_id;
1128 display->x_pos = AV_RB16(buf) & 0xfff;
1130 display->y_pos = AV_RB16(buf) & 0xfff;
1133 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1134 display->fgcolor = *buf++;
1135 display->bgcolor = *buf++;
1138 display->region_list_next = region->display_list;
1139 region->display_list = display;
1141 display->object_list_next = object->display_list;
1142 object->display_list = display;
1146 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1147 const uint8_t *buf, int buf_size)
1149 DVBSubContext *ctx = avctx->priv_data;
1150 DVBSubRegionDisplay *display;
1151 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1153 const uint8_t *buf_end = buf + buf_size;
1163 version = ((*buf)>>4) & 15;
1164 page_state = ((*buf++) >> 2) & 3;
1166 if (ctx->version != version) {
1168 ctx->time_out = timeout;
1169 ctx->version = version;
1171 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1173 if (page_state == 1 || page_state == 2) {
1174 delete_regions(ctx);
1175 delete_objects(ctx);
1179 tmp_display_list = ctx->display_list;
1180 ctx->display_list = NULL;
1182 while (buf + 5 < buf_end) {
1186 display = tmp_display_list;
1187 tmp_ptr = &tmp_display_list;
1189 while (display && display->region_id != region_id) {
1190 tmp_ptr = &display->next;
1191 display = display->next;
1195 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1197 display->region_id = region_id;
1199 display->x_pos = AV_RB16(buf);
1201 display->y_pos = AV_RB16(buf);
1204 *tmp_ptr = display->next;
1206 display->next = ctx->display_list;
1207 ctx->display_list = display;
1209 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1212 while (tmp_display_list) {
1213 display = tmp_display_list;
1215 tmp_display_list = display->next;
1225 static void save_display_set(DVBSubContext *ctx)
1227 DVBSubRegion *region;
1228 DVBSubRegionDisplay *display;
1230 uint32_t *clut_table;
1231 int x_pos, y_pos, width, height;
1232 int x, y, y_off, x_off;
1235 static int fileno_index = 0;
1242 for (display = ctx->display_list; display; display = display->next) {
1243 region = get_region(ctx, display->region_id);
1246 x_pos = display->x_pos;
1247 y_pos = display->y_pos;
1248 width = region->width;
1249 height = region->height;
1251 if (display->x_pos < x_pos) {
1252 width += (x_pos - display->x_pos);
1253 x_pos = display->x_pos;
1256 if (display->y_pos < y_pos) {
1257 height += (y_pos - display->y_pos);
1258 y_pos = display->y_pos;
1261 if (display->x_pos + region->width > x_pos + width) {
1262 width = display->x_pos + region->width - x_pos;
1265 if (display->y_pos + region->height > y_pos + height) {
1266 height = display->y_pos + region->height - y_pos;
1273 pbuf = av_malloc(width * height * 4);
1275 for (display = ctx->display_list; display; display = display->next) {
1276 region = get_region(ctx, display->region_id);
1278 x_off = display->x_pos - x_pos;
1279 y_off = display->y_pos - y_pos;
1281 clut = get_clut(ctx, region->clut);
1284 clut = &default_clut;
1286 switch (region->depth) {
1288 clut_table = clut->clut4;
1291 clut_table = clut->clut256;
1295 clut_table = clut->clut16;
1299 for (y = 0; y < region->height; y++) {
1300 for (x = 0; x < region->width; x++) {
1301 pbuf[((y + y_off) * width) + x_off + x] =
1302 clut_table[region->pbuf[y * region->width + x]];
1308 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1310 png_save2(filename, pbuf, width, height);
1319 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1323 DVBSubContext *ctx = avctx->priv_data;
1324 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1325 int dds_version, info_byte;
1330 info_byte = bytestream_get_byte(&buf);
1331 dds_version = info_byte >> 4;
1332 if (display_def && display_def->version == dds_version)
1333 return; // already have this display definition version
1336 display_def = av_mallocz(sizeof(*display_def));
1337 ctx->display_definition = display_def;
1342 display_def->version = dds_version;
1345 display_def->width = bytestream_get_be16(&buf) + 1;
1346 display_def->height = bytestream_get_be16(&buf) + 1;
1347 if (!avctx->width || !avctx->height) {
1348 avctx->width = display_def->width;
1349 avctx->height = display_def->height;
1355 if (info_byte & 1<<3) { // display_window_flag
1356 display_def->x = bytestream_get_be16(&buf);
1357 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1358 display_def->y = bytestream_get_be16(&buf);
1359 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1363 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1364 int buf_size, AVSubtitle *sub)
1366 DVBSubContext *ctx = avctx->priv_data;
1367 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1369 DVBSubRegion *region;
1370 DVBSubRegionDisplay *display;
1371 AVSubtitleRect *rect;
1373 uint32_t *clut_table;
1375 int offset_x=0, offset_y=0;
1377 sub->end_display_time = ctx->time_out * 1000;
1380 offset_x = display_def->x;
1381 offset_y = display_def->y;
1385 for (display = ctx->display_list; display; display = display->next)
1387 region = get_region(ctx, display->region_id);
1388 if (region && region->dirty)
1392 if (sub->num_rects > 0){
1393 sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);
1394 for(i=0; i<sub->num_rects; i++)
1395 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
1399 for (display = ctx->display_list; display; display = display->next) {
1400 region = get_region(ctx, display->region_id);
1408 rect = sub->rects[i];
1409 rect->x = display->x_pos + offset_x;
1410 rect->y = display->y_pos + offset_y;
1411 rect->w = region->width;
1412 rect->h = region->height;
1413 rect->nb_colors = (1 << region->depth);
1414 rect->type = SUBTITLE_BITMAP;
1415 rect->pict.linesize[0] = region->width;
1417 clut = get_clut(ctx, region->clut);
1420 clut = &default_clut;
1422 switch (region->depth) {
1424 clut_table = clut->clut4;
1427 clut_table = clut->clut256;
1431 clut_table = clut->clut16;
1435 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
1436 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
1438 rect->pict.data[0] = av_malloc(region->buf_size);
1439 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
1445 save_display_set(ctx);
1451 static int dvbsub_decode(AVCodecContext *avctx,
1452 void *data, int *data_size,
1455 const uint8_t *buf = avpkt->data;
1456 int buf_size = avpkt->size;
1457 DVBSubContext *ctx = avctx->priv_data;
1458 AVSubtitle *sub = data;
1459 const uint8_t *p, *p_end;
1465 int got_segment = 0;
1467 av_dlog(avctx, "DVB sub packet:\n");
1469 for (i=0; i < buf_size; i++) {
1470 av_dlog(avctx, "%02x ", buf[i]);
1472 av_dlog(avctx, "\n");
1476 av_dlog(avctx, "\n");
1478 if (buf_size <= 6 || *buf != 0x0f) {
1479 av_dlog(avctx, "incomplete or broken packet");
1484 p_end = buf + buf_size;
1486 while (p_end - p >= 6 && *p == 0x0f) {
1488 segment_type = *p++;
1489 page_id = AV_RB16(p);
1491 segment_length = AV_RB16(p);
1494 if (p_end - p < segment_length) {
1495 av_dlog(avctx, "incomplete or broken packet");
1499 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1500 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1501 switch (segment_type) {
1502 case DVBSUB_PAGE_SEGMENT:
1503 dvbsub_parse_page_segment(avctx, p, segment_length);
1506 case DVBSUB_REGION_SEGMENT:
1507 dvbsub_parse_region_segment(avctx, p, segment_length);
1510 case DVBSUB_CLUT_SEGMENT:
1511 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1512 if (ret < 0) return ret;
1515 case DVBSUB_OBJECT_SEGMENT:
1516 dvbsub_parse_object_segment(avctx, p, segment_length);
1519 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1520 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
1522 case DVBSUB_DISPLAY_SEGMENT:
1523 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1527 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1528 segment_type, page_id, segment_length);
1533 p += segment_length;
1535 // Some streams do not send a display segment but if we have all the other
1536 // segments then we need no further data.
1537 if (got_segment == 15 && sub)
1538 *data_size = dvbsub_display_end_segment(avctx, p, 0, sub);
1544 AVCodec ff_dvbsub_decoder = {
1546 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1547 .type = AVMEDIA_TYPE_SUBTITLE,
1548 .id = AV_CODEC_ID_DVB_SUBTITLE,
1549 .priv_data_size = sizeof(DVBSubContext),
1550 .init = dvbsub_init_decoder,
1551 .close = dvbsub_close_decoder,
1552 .decode = dvbsub_decode,