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"
26 #include "libavutil/opt.h"
28 #define DVBSUB_PAGE_SEGMENT 0x10
29 #define DVBSUB_REGION_SEGMENT 0x11
30 #define DVBSUB_CLUT_SEGMENT 0x12
31 #define DVBSUB_OBJECT_SEGMENT 0x13
32 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
33 #define DVBSUB_DISPLAY_SEGMENT 0x80
35 #define cm (ff_crop_tab + MAX_NEG_CROP)
39 static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
40 uint32_t *rgba_palette)
44 char fname[40], fname2[40];
47 snprintf(fname, 40, "%s.ppm", filename);
49 f = fopen(fname, "w");
58 for(y = 0; y < h; y++) {
59 for(x = 0; x < w; x++) {
60 v = rgba_palette[bitmap[y * w + x]];
61 putc((v >> 16) & 0xff, f);
62 putc((v >> 8) & 0xff, f);
63 putc((v >> 0) & 0xff, f);
69 snprintf(fname2, 40, "%s-a.pgm", filename);
71 f = fopen(fname2, "w");
80 for(y = 0; y < h; y++) {
81 for(x = 0; x < w; x++) {
82 v = rgba_palette[bitmap[y * w + x]];
83 putc((v >> 24) & 0xff, f);
88 snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
91 snprintf(command, 1024, "rm %s %s", fname, fname2);
96 static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
100 char fname[40], fname2[40];
103 snprintf(fname, sizeof(fname), "%s.ppm", filename);
105 f = fopen(fname, "w");
114 for(y = 0; y < h; y++) {
115 for(x = 0; x < w; x++) {
116 v = bitmap[y * w + x];
117 putc((v >> 16) & 0xff, f);
118 putc((v >> 8) & 0xff, f);
119 putc((v >> 0) & 0xff, f);
125 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
127 f = fopen(fname2, "w");
136 for(y = 0; y < h; y++) {
137 for(x = 0; x < w; x++) {
138 v = bitmap[y * w + x];
139 putc((v >> 24) & 0xff, f);
144 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
147 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
152 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
154 typedef struct DVBSubCLUT {
160 uint32_t clut256[256];
162 struct DVBSubCLUT *next;
165 static DVBSubCLUT default_clut;
167 typedef struct DVBSubObjectDisplay {
177 struct DVBSubObjectDisplay *region_list_next;
178 struct DVBSubObjectDisplay *object_list_next;
179 } DVBSubObjectDisplay;
181 typedef struct DVBSubObject {
187 DVBSubObjectDisplay *display_list;
189 struct DVBSubObject *next;
192 typedef struct DVBSubRegionDisplay {
198 struct DVBSubRegionDisplay *next;
199 } DVBSubRegionDisplay;
201 typedef struct DVBSubRegion {
216 DVBSubObjectDisplay *display_list;
218 struct DVBSubRegion *next;
221 typedef struct DVBSubDisplayDefinition {
228 } DVBSubDisplayDefinition;
230 typedef struct DVBSubContext {
237 int compute_edt; /**< if 1 end display time calculated using pts
238 if 0 (Default) calculated using time out */
240 DVBSubRegion *region_list;
241 DVBSubCLUT *clut_list;
242 DVBSubObject *object_list;
244 DVBSubRegionDisplay *display_list;
245 DVBSubDisplayDefinition *display_definition;
249 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
251 DVBSubObject *ptr = ctx->object_list;
253 while (ptr && ptr->id != object_id) {
260 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
262 DVBSubCLUT *ptr = ctx->clut_list;
264 while (ptr && ptr->id != clut_id) {
271 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
273 DVBSubRegion *ptr = ctx->region_list;
275 while (ptr && ptr->id != region_id) {
282 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
284 DVBSubObject *object, *obj2, **obj2_ptr;
285 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
287 while (region->display_list) {
288 display = region->display_list;
290 object = get_object(ctx, display->object_id);
293 obj_disp_ptr = &object->display_list;
294 obj_disp = *obj_disp_ptr;
296 while (obj_disp && obj_disp != display) {
297 obj_disp_ptr = &obj_disp->object_list_next;
298 obj_disp = *obj_disp_ptr;
302 *obj_disp_ptr = obj_disp->object_list_next;
304 if (!object->display_list) {
305 obj2_ptr = &ctx->object_list;
308 while (obj2 != object) {
310 obj2_ptr = &obj2->next;
314 *obj2_ptr = obj2->next;
321 region->display_list = display->region_list_next;
328 static void delete_cluts(DVBSubContext *ctx)
332 while (ctx->clut_list) {
333 clut = ctx->clut_list;
335 ctx->clut_list = clut->next;
341 static void delete_objects(DVBSubContext *ctx)
343 DVBSubObject *object;
345 while (ctx->object_list) {
346 object = ctx->object_list;
348 ctx->object_list = object->next;
354 static void delete_regions(DVBSubContext *ctx)
356 DVBSubRegion *region;
358 while (ctx->region_list) {
359 region = ctx->region_list;
361 ctx->region_list = region->next;
363 delete_region_display_list(ctx, region);
365 av_free(region->pbuf);
370 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
372 int i, r, g, b, a = 0;
373 DVBSubContext *ctx = avctx->priv_data;
375 if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
376 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
377 ctx->composition_id = -1;
378 ctx->ancillary_id = -1;
380 if (avctx->extradata_size > 5) {
381 av_log(avctx, AV_LOG_WARNING, "Decoding first DVB subtitles sub-stream\n");
384 ctx->composition_id = AV_RB16(avctx->extradata);
385 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
389 ctx->prev_start = AV_NOPTS_VALUE;
391 default_clut.id = -1;
392 default_clut.next = NULL;
394 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
395 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
396 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
397 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
399 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
400 for (i = 1; i < 16; i++) {
402 r = (i & 1) ? 255 : 0;
403 g = (i & 2) ? 255 : 0;
404 b = (i & 4) ? 255 : 0;
406 r = (i & 1) ? 127 : 0;
407 g = (i & 2) ? 127 : 0;
408 b = (i & 4) ? 127 : 0;
410 default_clut.clut16[i] = RGBA(r, g, b, 255);
413 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
414 for (i = 1; i < 256; i++) {
416 r = (i & 1) ? 255 : 0;
417 g = (i & 2) ? 255 : 0;
418 b = (i & 4) ? 255 : 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 = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
430 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
431 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
435 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
436 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
437 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
441 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
442 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
443 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
448 default_clut.clut256[i] = RGBA(r, g, b, a);
454 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
456 DVBSubContext *ctx = avctx->priv_data;
457 DVBSubRegionDisplay *display;
465 av_freep(&ctx->display_definition);
467 while (ctx->display_list) {
468 display = ctx->display_list;
469 ctx->display_list = display->next;
477 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
478 const uint8_t **srcbuf, int buf_size,
479 int non_mod, uint8_t *map_table, int x_pos)
485 int pixels_read = x_pos;
487 init_get_bits(&gb, *srcbuf, buf_size << 3);
491 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
492 bits = get_bits(&gb, 2);
495 if (non_mod != 1 || bits != 1) {
497 *destbuf++ = map_table[bits];
503 bits = get_bits1(&gb);
505 run_length = get_bits(&gb, 3) + 3;
506 bits = get_bits(&gb, 2);
508 if (non_mod == 1 && bits == 1)
509 pixels_read += run_length;
512 bits = map_table[bits];
513 while (run_length-- > 0 && pixels_read < dbuf_len) {
519 bits = get_bits1(&gb);
521 bits = get_bits(&gb, 2);
523 run_length = get_bits(&gb, 4) + 12;
524 bits = get_bits(&gb, 2);
526 if (non_mod == 1 && bits == 1)
527 pixels_read += run_length;
530 bits = map_table[bits];
531 while (run_length-- > 0 && pixels_read < dbuf_len) {
536 } else if (bits == 3) {
537 run_length = get_bits(&gb, 8) + 29;
538 bits = get_bits(&gb, 2);
540 if (non_mod == 1 && bits == 1)
541 pixels_read += run_length;
544 bits = map_table[bits];
545 while (run_length-- > 0 && pixels_read < dbuf_len) {
550 } else if (bits == 1) {
556 while (run_length-- > 0 && pixels_read < dbuf_len) {
561 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
576 if (get_bits(&gb, 6))
577 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
579 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
584 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
585 const uint8_t **srcbuf, int buf_size,
586 int non_mod, uint8_t *map_table, int x_pos)
592 int pixels_read = x_pos;
594 init_get_bits(&gb, *srcbuf, buf_size << 3);
598 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
599 bits = get_bits(&gb, 4);
602 if (non_mod != 1 || bits != 1) {
604 *destbuf++ = map_table[bits];
610 bits = get_bits1(&gb);
612 run_length = get_bits(&gb, 3);
614 if (run_length == 0) {
615 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
626 while (run_length-- > 0 && pixels_read < dbuf_len) {
631 bits = get_bits1(&gb);
633 run_length = get_bits(&gb, 2) + 4;
634 bits = get_bits(&gb, 4);
636 if (non_mod == 1 && bits == 1)
637 pixels_read += run_length;
640 bits = map_table[bits];
641 while (run_length-- > 0 && pixels_read < dbuf_len) {
647 bits = get_bits(&gb, 2);
649 run_length = get_bits(&gb, 4) + 9;
650 bits = get_bits(&gb, 4);
652 if (non_mod == 1 && bits == 1)
653 pixels_read += run_length;
656 bits = map_table[bits];
657 while (run_length-- > 0 && pixels_read < dbuf_len) {
662 } else if (bits == 3) {
663 run_length = get_bits(&gb, 8) + 25;
664 bits = get_bits(&gb, 4);
666 if (non_mod == 1 && bits == 1)
667 pixels_read += run_length;
670 bits = map_table[bits];
671 while (run_length-- > 0 && pixels_read < dbuf_len) {
676 } else if (bits == 1) {
682 while (run_length-- > 0 && pixels_read < dbuf_len) {
699 if (get_bits(&gb, 8))
700 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
702 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
707 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
708 const uint8_t **srcbuf, int buf_size,
709 int non_mod, uint8_t *map_table, int x_pos)
711 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
714 int pixels_read = x_pos;
718 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
722 if (non_mod != 1 || bits != 1) {
724 *destbuf++ = map_table[bits];
731 run_length = bits & 0x7f;
732 if ((bits & 0x80) == 0) {
733 if (run_length == 0) {
741 while (run_length-- > 0 && pixels_read < dbuf_len) {
748 if (non_mod == 1 && bits == 1)
749 pixels_read += run_length;
751 bits = map_table[bits];
752 else while (run_length-- > 0 && pixels_read < dbuf_len) {
761 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
766 static void save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
768 DVBSubContext *ctx = avctx->priv_data;
769 DVBSubRegionDisplay *display;
770 DVBSubDisplayDefinition *display_def = ctx->display_definition;
771 DVBSubRegion *region;
772 AVSubtitleRect *rect;
774 uint32_t *clut_table;
776 int offset_x=0, offset_y=0;
780 offset_x = display_def->x;
781 offset_y = display_def->y;
784 /* Not touching AVSubtitles again*/
786 avpriv_request_sample(ctx, "Different Version of Segment asked Twice\n");
789 for (display = ctx->display_list; display; display = display->next) {
790 region = get_region(ctx, display->region_id);
791 if (region && region->dirty)
795 if(ctx->compute_edt == 0) {
796 sub->end_display_time = ctx->time_out * 1000;
798 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
799 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
802 if (sub->num_rects > 0) {
804 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
805 for(i=0; i<sub->num_rects; i++)
806 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
810 for (display = ctx->display_list; display; display = display->next) {
811 region = get_region(ctx, display->region_id);
819 rect = sub->rects[i];
820 rect->x = display->x_pos + offset_x;
821 rect->y = display->y_pos + offset_y;
822 rect->w = region->width;
823 rect->h = region->height;
824 rect->nb_colors = (1 << region->depth);
825 rect->type = SUBTITLE_BITMAP;
826 rect->pict.linesize[0] = region->width;
828 clut = get_clut(ctx, region->clut);
831 clut = &default_clut;
833 switch (region->depth) {
835 clut_table = clut->clut4;
838 clut_table = clut->clut256;
842 clut_table = clut->clut16;
846 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
847 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
849 rect->pict.data[0] = av_malloc(region->buf_size);
850 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
857 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
858 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
860 DVBSubContext *ctx = avctx->priv_data;
862 DVBSubRegion *region = get_region(ctx, display->region_id);
863 const uint8_t *buf_end = buf + buf_size;
868 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
869 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
870 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
871 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
875 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
876 top_bottom ? "bottom" : "top");
878 for (i = 0; i < buf_size; i++) {
880 av_dlog(avctx, "0x%8p: ", buf+i);
882 av_dlog(avctx, "%02x ", buf[i]);
884 av_dlog(avctx, "\n");
888 av_dlog(avctx, "\n");
897 x_pos = display->x_pos;
898 y_pos = display->y_pos;
902 while (buf < buf_end) {
903 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
904 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
910 if (region->depth == 8)
912 else if (region->depth == 4)
917 x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width),
918 region->width, &buf, buf_end - buf,
919 non_mod, map_table, x_pos);
922 if (region->depth < 4) {
923 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
927 if (region->depth == 8)
932 x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width),
933 region->width, &buf, buf_end - buf,
934 non_mod, map_table, x_pos);
937 if (region->depth < 8) {
938 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
942 x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width),
943 region->width, &buf, buf_end - buf,
944 non_mod, NULL, x_pos);
948 map2to4[0] = (*buf) >> 4;
949 map2to4[1] = (*buf++) & 0xf;
950 map2to4[2] = (*buf) >> 4;
951 map2to4[3] = (*buf++) & 0xf;
954 for (i = 0; i < 4; i++)
958 for (i = 0; i < 16; i++)
963 x_pos = display->x_pos;
967 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
973 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
974 const uint8_t *buf, int buf_size)
976 DVBSubContext *ctx = avctx->priv_data;
978 const uint8_t *buf_end = buf + buf_size;
980 DVBSubObject *object;
981 DVBSubObjectDisplay *display;
982 int top_field_len, bottom_field_len;
984 int coding_method, non_modifying_color;
986 object_id = AV_RB16(buf);
989 object = get_object(ctx, object_id);
994 coding_method = ((*buf) >> 2) & 3;
995 non_modifying_color = ((*buf++) >> 1) & 1;
997 if (coding_method == 0) {
998 top_field_len = AV_RB16(buf);
1000 bottom_field_len = AV_RB16(buf);
1003 if (buf + top_field_len + bottom_field_len > buf_end) {
1004 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
1008 for (display = object->display_list; display; display = display->object_list_next) {
1009 const uint8_t *block = buf;
1010 int bfl = bottom_field_len;
1012 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1013 non_modifying_color);
1015 if (bottom_field_len > 0)
1016 block = buf + top_field_len;
1018 bfl = top_field_len;
1020 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1021 non_modifying_color);
1024 /* } else if (coding_method == 1) {*/
1027 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1032 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1033 const uint8_t *buf, int buf_size)
1035 DVBSubContext *ctx = avctx->priv_data;
1037 const uint8_t *buf_end = buf + buf_size;
1041 int entry_id, depth , full_range;
1042 int y, cr, cb, alpha;
1043 int r, g, b, r_add, g_add, b_add;
1045 av_dlog(avctx, "DVB clut packet:\n");
1047 for (i=0; i < buf_size; i++) {
1048 av_dlog(avctx, "%02x ", buf[i]);
1050 av_dlog(avctx, "\n");
1054 av_dlog(avctx, "\n");
1057 version = ((*buf)>>4)&15;
1060 clut = get_clut(ctx, clut_id);
1063 clut = av_malloc(sizeof(DVBSubCLUT));
1065 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1070 clut->next = ctx->clut_list;
1071 ctx->clut_list = clut;
1074 if (clut->version != version) {
1076 clut->version = version;
1078 while (buf + 4 < buf_end) {
1081 depth = (*buf) & 0xe0;
1084 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1088 full_range = (*buf++) & 1;
1097 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1098 cb = (buf[1] << 2) & 0xf0;
1099 alpha = (buf[1] << 6) & 0xc0;
1107 YUV_TO_RGB1_CCIR(cb, cr);
1108 YUV_TO_RGB2_CCIR(r, g, b, y);
1110 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1111 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1112 av_dlog(avctx, "More than one bit level marked: %x\n", depth);
1113 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1114 return AVERROR_INVALIDDATA;
1118 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1119 else if (depth & 0x40)
1120 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1121 else if (depth & 0x20)
1122 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1129 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1130 const uint8_t *buf, int buf_size)
1132 DVBSubContext *ctx = avctx->priv_data;
1134 const uint8_t *buf_end = buf + buf_size;
1135 int region_id, object_id;
1136 int av_unused version;
1137 DVBSubRegion *region;
1138 DVBSubObject *object;
1139 DVBSubObjectDisplay *display;
1147 region = get_region(ctx, region_id);
1150 region = av_mallocz(sizeof(DVBSubRegion));
1152 region->id = region_id;
1153 region->version = -1;
1155 region->next = ctx->region_list;
1156 ctx->region_list = region;
1159 version = ((*buf)>>4) & 15;
1160 fill = ((*buf++) >> 3) & 1;
1162 region->width = AV_RB16(buf);
1164 region->height = AV_RB16(buf);
1167 if (region->width * region->height != region->buf_size) {
1168 av_free(region->pbuf);
1170 region->buf_size = region->width * region->height;
1172 region->pbuf = av_malloc(region->buf_size);
1178 region->depth = 1 << (((*buf++) >> 2) & 7);
1179 if(region->depth<2 || region->depth>8){
1180 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1183 region->clut = *buf++;
1185 if (region->depth == 8) {
1186 region->bgcolor = *buf++;
1191 if (region->depth == 4)
1192 region->bgcolor = (((*buf++) >> 4) & 15);
1194 region->bgcolor = (((*buf++) >> 2) & 3);
1197 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1200 memset(region->pbuf, region->bgcolor, region->buf_size);
1201 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1204 delete_region_display_list(ctx, region);
1206 while (buf + 5 < buf_end) {
1207 object_id = AV_RB16(buf);
1210 object = get_object(ctx, object_id);
1213 object = av_mallocz(sizeof(DVBSubObject));
1215 object->id = object_id;
1216 object->next = ctx->object_list;
1217 ctx->object_list = object;
1220 object->type = (*buf) >> 6;
1222 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1224 display->object_id = object_id;
1225 display->region_id = region_id;
1227 display->x_pos = AV_RB16(buf) & 0xfff;
1229 display->y_pos = AV_RB16(buf) & 0xfff;
1232 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1233 display->fgcolor = *buf++;
1234 display->bgcolor = *buf++;
1237 display->region_list_next = region->display_list;
1238 region->display_list = display;
1240 display->object_list_next = object->display_list;
1241 object->display_list = display;
1245 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1246 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1248 DVBSubContext *ctx = avctx->priv_data;
1249 DVBSubRegionDisplay *display;
1250 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1252 const uint8_t *buf_end = buf + buf_size;
1262 version = ((*buf)>>4) & 15;
1263 page_state = ((*buf++) >> 2) & 3;
1265 if (ctx->version == version) {
1269 ctx->time_out = timeout;
1270 ctx->version = version;
1272 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1274 if(ctx->compute_edt == 1)
1275 save_subtitle_set(avctx, sub, got_output);
1277 if (page_state == 1 || page_state == 2) {
1278 delete_regions(ctx);
1279 delete_objects(ctx);
1283 tmp_display_list = ctx->display_list;
1284 ctx->display_list = NULL;
1286 while (buf + 5 < buf_end) {
1290 display = tmp_display_list;
1291 tmp_ptr = &tmp_display_list;
1293 while (display && display->region_id != region_id) {
1294 tmp_ptr = &display->next;
1295 display = display->next;
1299 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1301 display->region_id = region_id;
1303 display->x_pos = AV_RB16(buf);
1305 display->y_pos = AV_RB16(buf);
1308 *tmp_ptr = display->next;
1310 display->next = ctx->display_list;
1311 ctx->display_list = display;
1313 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1316 while (tmp_display_list) {
1317 display = tmp_display_list;
1319 tmp_display_list = display->next;
1328 static void save_display_set(DVBSubContext *ctx)
1330 DVBSubRegion *region;
1331 DVBSubRegionDisplay *display;
1333 uint32_t *clut_table;
1334 int x_pos, y_pos, width, height;
1335 int x, y, y_off, x_off;
1338 static int fileno_index = 0;
1345 for (display = ctx->display_list; display; display = display->next) {
1346 region = get_region(ctx, display->region_id);
1349 x_pos = display->x_pos;
1350 y_pos = display->y_pos;
1351 width = region->width;
1352 height = region->height;
1354 if (display->x_pos < x_pos) {
1355 width += (x_pos - display->x_pos);
1356 x_pos = display->x_pos;
1359 if (display->y_pos < y_pos) {
1360 height += (y_pos - display->y_pos);
1361 y_pos = display->y_pos;
1364 if (display->x_pos + region->width > x_pos + width) {
1365 width = display->x_pos + region->width - x_pos;
1368 if (display->y_pos + region->height > y_pos + height) {
1369 height = display->y_pos + region->height - y_pos;
1376 pbuf = av_malloc(width * height * 4);
1378 for (display = ctx->display_list; display; display = display->next) {
1379 region = get_region(ctx, display->region_id);
1381 x_off = display->x_pos - x_pos;
1382 y_off = display->y_pos - y_pos;
1384 clut = get_clut(ctx, region->clut);
1387 clut = &default_clut;
1389 switch (region->depth) {
1391 clut_table = clut->clut4;
1394 clut_table = clut->clut256;
1398 clut_table = clut->clut16;
1402 for (y = 0; y < region->height; y++) {
1403 for (x = 0; x < region->width; x++) {
1404 pbuf[((y + y_off) * width) + x_off + x] =
1405 clut_table[region->pbuf[y * region->width + x]];
1411 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1413 png_save2(filename, pbuf, width, height);
1422 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1426 DVBSubContext *ctx = avctx->priv_data;
1427 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1428 int dds_version, info_byte;
1433 info_byte = bytestream_get_byte(&buf);
1434 dds_version = info_byte >> 4;
1435 if (display_def && display_def->version == dds_version)
1436 return; // already have this display definition version
1439 display_def = av_mallocz(sizeof(*display_def));
1440 ctx->display_definition = display_def;
1445 display_def->version = dds_version;
1448 display_def->width = bytestream_get_be16(&buf) + 1;
1449 display_def->height = bytestream_get_be16(&buf) + 1;
1450 if (!avctx->width || !avctx->height) {
1451 avctx->width = display_def->width;
1452 avctx->height = display_def->height;
1458 if (info_byte & 1<<3) { // display_window_flag
1459 display_def->x = bytestream_get_be16(&buf);
1460 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1461 display_def->y = bytestream_get_be16(&buf);
1462 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1466 static void dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1467 int buf_size, AVSubtitle *sub,int *got_output)
1469 DVBSubContext *ctx = avctx->priv_data;
1471 if(ctx->compute_edt == 0)
1472 save_subtitle_set(avctx, sub, got_output);
1474 save_display_set(ctx);
1479 static int dvbsub_decode(AVCodecContext *avctx,
1480 void *data, int *data_size,
1483 const uint8_t *buf = avpkt->data;
1484 int buf_size = avpkt->size;
1485 DVBSubContext *ctx = avctx->priv_data;
1486 AVSubtitle *sub = data;
1487 const uint8_t *p, *p_end;
1493 int got_segment = 0;
1495 av_dlog(avctx, "DVB sub packet:\n");
1497 for (i=0; i < buf_size; i++) {
1498 av_dlog(avctx, "%02x ", buf[i]);
1500 av_dlog(avctx, "\n");
1504 av_dlog(avctx, "\n");
1506 if (buf_size <= 6 || *buf != 0x0f) {
1507 av_dlog(avctx, "incomplete or broken packet");
1512 p_end = buf + buf_size;
1514 while (p_end - p >= 6 && *p == 0x0f) {
1516 segment_type = *p++;
1517 page_id = AV_RB16(p);
1519 segment_length = AV_RB16(p);
1522 if (avctx->debug & FF_DEBUG_STARTCODE) {
1523 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1526 if (p_end - p < segment_length) {
1527 av_dlog(avctx, "incomplete or broken packet");
1532 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1533 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1534 switch (segment_type) {
1535 case DVBSUB_PAGE_SEGMENT:
1536 dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1539 case DVBSUB_REGION_SEGMENT:
1540 dvbsub_parse_region_segment(avctx, p, segment_length);
1543 case DVBSUB_CLUT_SEGMENT:
1544 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1545 if (ret < 0) goto end;
1548 case DVBSUB_OBJECT_SEGMENT:
1549 dvbsub_parse_object_segment(avctx, p, segment_length);
1552 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1553 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
1555 case DVBSUB_DISPLAY_SEGMENT:
1556 dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1560 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1561 segment_type, page_id, segment_length);
1566 p += segment_length;
1568 // Some streams do not send a display segment but if we have all the other
1569 // segments then we need no further data.
1570 if (got_segment == 15) {
1571 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1572 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1578 avsubtitle_free(sub);
1581 if(ctx->compute_edt == 1 )
1582 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1588 static const AVOption options[] = {
1589 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
1592 static const AVClass dvbsubdec_class = {
1593 .class_name = "DVB Sub Decoder",
1594 .item_name = av_default_item_name,
1596 .version = LIBAVUTIL_VERSION_INT,
1599 AVCodec ff_dvbsub_decoder = {
1601 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1602 .type = AVMEDIA_TYPE_SUBTITLE,
1603 .id = AV_CODEC_ID_DVB_SUBTITLE,
1604 .priv_data_size = sizeof(DVBSubContext),
1605 .init = dvbsub_init_decoder,
1606 .close = dvbsub_close_decoder,
1607 .decode = dvbsub_decode,
1608 .priv_class = &dvbsubdec_class,