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)
330 while (ctx->clut_list) {
331 DVBSubCLUT *clut = ctx->clut_list;
333 ctx->clut_list = clut->next;
339 static void delete_objects(DVBSubContext *ctx)
341 while (ctx->object_list) {
342 DVBSubObject *object = ctx->object_list;
344 ctx->object_list = object->next;
350 static void delete_regions(DVBSubContext *ctx)
352 while (ctx->region_list) {
353 DVBSubRegion *region = ctx->region_list;
355 ctx->region_list = region->next;
357 delete_region_display_list(ctx, region);
359 av_freep(®ion->pbuf);
364 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
366 int i, r, g, b, a = 0;
367 DVBSubContext *ctx = avctx->priv_data;
369 if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
370 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
371 ctx->composition_id = -1;
372 ctx->ancillary_id = -1;
374 if (avctx->extradata_size > 5) {
375 av_log(avctx, AV_LOG_WARNING, "Decoding first DVB subtitles sub-stream\n");
378 ctx->composition_id = AV_RB16(avctx->extradata);
379 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
383 ctx->prev_start = AV_NOPTS_VALUE;
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");
760 static void save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
762 DVBSubContext *ctx = avctx->priv_data;
763 DVBSubRegionDisplay *display;
764 DVBSubDisplayDefinition *display_def = ctx->display_definition;
765 DVBSubRegion *region;
766 AVSubtitleRect *rect;
768 uint32_t *clut_table;
770 int offset_x=0, offset_y=0;
774 offset_x = display_def->x;
775 offset_y = display_def->y;
778 /* Not touching AVSubtitles again*/
780 avpriv_request_sample(ctx, "Different Version of Segment asked Twice\n");
783 for (display = ctx->display_list; display; display = display->next) {
784 region = get_region(ctx, display->region_id);
785 if (region && region->dirty)
789 if(ctx->compute_edt == 0) {
790 sub->end_display_time = ctx->time_out * 1000;
792 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
793 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
796 if (sub->num_rects > 0) {
798 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
799 for(i=0; i<sub->num_rects; i++)
800 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
804 for (display = ctx->display_list; display; display = display->next) {
805 region = get_region(ctx, display->region_id);
813 rect = sub->rects[i];
814 rect->x = display->x_pos + offset_x;
815 rect->y = display->y_pos + offset_y;
816 rect->w = region->width;
817 rect->h = region->height;
818 rect->nb_colors = (1 << region->depth);
819 rect->type = SUBTITLE_BITMAP;
820 rect->pict.linesize[0] = region->width;
822 clut = get_clut(ctx, region->clut);
825 clut = &default_clut;
827 switch (region->depth) {
829 clut_table = clut->clut4;
832 clut_table = clut->clut256;
836 clut_table = clut->clut16;
840 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
841 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
843 rect->pict.data[0] = av_malloc(region->buf_size);
844 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
851 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
852 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
854 DVBSubContext *ctx = avctx->priv_data;
856 DVBSubRegion *region = get_region(ctx, display->region_id);
857 const uint8_t *buf_end = buf + buf_size;
862 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
863 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
864 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
865 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
869 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
870 top_bottom ? "bottom" : "top");
872 for (i = 0; i < buf_size; i++) {
874 av_dlog(avctx, "0x%8p: ", buf+i);
876 av_dlog(avctx, "%02x ", buf[i]);
878 av_dlog(avctx, "\n");
882 av_dlog(avctx, "\n");
891 x_pos = display->x_pos;
892 y_pos = display->y_pos;
896 while (buf < buf_end) {
897 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
898 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
904 if (region->depth == 8)
906 else if (region->depth == 4)
911 x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width),
912 region->width, &buf, buf_end - buf,
913 non_mod, map_table, x_pos);
916 if (region->depth < 4) {
917 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
921 if (region->depth == 8)
926 x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width),
927 region->width, &buf, buf_end - buf,
928 non_mod, map_table, x_pos);
931 if (region->depth < 8) {
932 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
936 x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width),
937 region->width, &buf, buf_end - buf,
938 non_mod, NULL, x_pos);
942 map2to4[0] = (*buf) >> 4;
943 map2to4[1] = (*buf++) & 0xf;
944 map2to4[2] = (*buf) >> 4;
945 map2to4[3] = (*buf++) & 0xf;
948 for (i = 0; i < 4; i++)
952 for (i = 0; i < 16; i++)
957 x_pos = display->x_pos;
961 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
967 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
968 const uint8_t *buf, int buf_size)
970 DVBSubContext *ctx = avctx->priv_data;
972 const uint8_t *buf_end = buf + buf_size;
974 DVBSubObject *object;
975 DVBSubObjectDisplay *display;
976 int top_field_len, bottom_field_len;
978 int coding_method, non_modifying_color;
980 object_id = AV_RB16(buf);
983 object = get_object(ctx, object_id);
988 coding_method = ((*buf) >> 2) & 3;
989 non_modifying_color = ((*buf++) >> 1) & 1;
991 if (coding_method == 0) {
992 top_field_len = AV_RB16(buf);
994 bottom_field_len = AV_RB16(buf);
997 if (buf + top_field_len + bottom_field_len > buf_end) {
998 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
1002 for (display = object->display_list; display; display = display->object_list_next) {
1003 const uint8_t *block = buf;
1004 int bfl = bottom_field_len;
1006 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1007 non_modifying_color);
1009 if (bottom_field_len > 0)
1010 block = buf + top_field_len;
1012 bfl = top_field_len;
1014 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1015 non_modifying_color);
1018 /* } else if (coding_method == 1) {*/
1021 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1026 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1027 const uint8_t *buf, int buf_size)
1029 DVBSubContext *ctx = avctx->priv_data;
1031 const uint8_t *buf_end = buf + buf_size;
1035 int entry_id, depth , full_range;
1036 int y, cr, cb, alpha;
1037 int r, g, b, r_add, g_add, b_add;
1039 av_dlog(avctx, "DVB clut packet:\n");
1041 for (i=0; i < buf_size; i++) {
1042 av_dlog(avctx, "%02x ", buf[i]);
1044 av_dlog(avctx, "\n");
1048 av_dlog(avctx, "\n");
1051 version = ((*buf)>>4)&15;
1054 clut = get_clut(ctx, clut_id);
1057 clut = av_malloc(sizeof(DVBSubCLUT));
1059 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1064 clut->next = ctx->clut_list;
1065 ctx->clut_list = clut;
1068 if (clut->version != version) {
1070 clut->version = version;
1072 while (buf + 4 < buf_end) {
1075 depth = (*buf) & 0xe0;
1078 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1082 full_range = (*buf++) & 1;
1091 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1092 cb = (buf[1] << 2) & 0xf0;
1093 alpha = (buf[1] << 6) & 0xc0;
1101 YUV_TO_RGB1_CCIR(cb, cr);
1102 YUV_TO_RGB2_CCIR(r, g, b, y);
1104 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1105 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1106 av_dlog(avctx, "More than one bit level marked: %x\n", depth);
1107 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1108 return AVERROR_INVALIDDATA;
1112 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1113 else if (depth & 0x40)
1114 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1115 else if (depth & 0x20)
1116 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1123 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1124 const uint8_t *buf, int buf_size)
1126 DVBSubContext *ctx = avctx->priv_data;
1128 const uint8_t *buf_end = buf + buf_size;
1129 int region_id, object_id;
1130 int av_unused version;
1131 DVBSubRegion *region;
1132 DVBSubObject *object;
1133 DVBSubObjectDisplay *display;
1141 region = get_region(ctx, region_id);
1144 region = av_mallocz(sizeof(DVBSubRegion));
1146 region->id = region_id;
1147 region->version = -1;
1149 region->next = ctx->region_list;
1150 ctx->region_list = region;
1153 version = ((*buf)>>4) & 15;
1154 fill = ((*buf++) >> 3) & 1;
1156 region->width = AV_RB16(buf);
1158 region->height = AV_RB16(buf);
1161 if (region->width * region->height != region->buf_size) {
1162 av_free(region->pbuf);
1164 region->buf_size = region->width * region->height;
1166 region->pbuf = av_malloc(region->buf_size);
1172 region->depth = 1 << (((*buf++) >> 2) & 7);
1173 if(region->depth<2 || region->depth>8){
1174 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1177 region->clut = *buf++;
1179 if (region->depth == 8) {
1180 region->bgcolor = *buf++;
1185 if (region->depth == 4)
1186 region->bgcolor = (((*buf++) >> 4) & 15);
1188 region->bgcolor = (((*buf++) >> 2) & 3);
1191 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1194 memset(region->pbuf, region->bgcolor, region->buf_size);
1195 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1198 delete_region_display_list(ctx, region);
1200 while (buf + 5 < buf_end) {
1201 object_id = AV_RB16(buf);
1204 object = get_object(ctx, object_id);
1207 object = av_mallocz(sizeof(DVBSubObject));
1209 object->id = object_id;
1210 object->next = ctx->object_list;
1211 ctx->object_list = object;
1214 object->type = (*buf) >> 6;
1216 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1218 display->object_id = object_id;
1219 display->region_id = region_id;
1221 display->x_pos = AV_RB16(buf) & 0xfff;
1223 display->y_pos = AV_RB16(buf) & 0xfff;
1226 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1227 display->fgcolor = *buf++;
1228 display->bgcolor = *buf++;
1231 display->region_list_next = region->display_list;
1232 region->display_list = display;
1234 display->object_list_next = object->display_list;
1235 object->display_list = display;
1239 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1240 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1242 DVBSubContext *ctx = avctx->priv_data;
1243 DVBSubRegionDisplay *display;
1244 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1246 const uint8_t *buf_end = buf + buf_size;
1256 version = ((*buf)>>4) & 15;
1257 page_state = ((*buf++) >> 2) & 3;
1259 if (ctx->version == version) {
1263 ctx->time_out = timeout;
1264 ctx->version = version;
1266 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1268 if(ctx->compute_edt == 1)
1269 save_subtitle_set(avctx, sub, got_output);
1271 if (page_state == 1 || page_state == 2) {
1272 delete_regions(ctx);
1273 delete_objects(ctx);
1277 tmp_display_list = ctx->display_list;
1278 ctx->display_list = NULL;
1280 while (buf + 5 < buf_end) {
1284 display = tmp_display_list;
1285 tmp_ptr = &tmp_display_list;
1287 while (display && display->region_id != region_id) {
1288 tmp_ptr = &display->next;
1289 display = display->next;
1293 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1295 display->region_id = region_id;
1297 display->x_pos = AV_RB16(buf);
1299 display->y_pos = AV_RB16(buf);
1302 *tmp_ptr = display->next;
1304 display->next = ctx->display_list;
1305 ctx->display_list = display;
1307 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1310 while (tmp_display_list) {
1311 display = tmp_display_list;
1313 tmp_display_list = display->next;
1322 static void save_display_set(DVBSubContext *ctx)
1324 DVBSubRegion *region;
1325 DVBSubRegionDisplay *display;
1327 uint32_t *clut_table;
1328 int x_pos, y_pos, width, height;
1329 int x, y, y_off, x_off;
1332 static int fileno_index = 0;
1339 for (display = ctx->display_list; display; display = display->next) {
1340 region = get_region(ctx, display->region_id);
1343 x_pos = display->x_pos;
1344 y_pos = display->y_pos;
1345 width = region->width;
1346 height = region->height;
1348 if (display->x_pos < x_pos) {
1349 width += (x_pos - display->x_pos);
1350 x_pos = display->x_pos;
1353 if (display->y_pos < y_pos) {
1354 height += (y_pos - display->y_pos);
1355 y_pos = display->y_pos;
1358 if (display->x_pos + region->width > x_pos + width) {
1359 width = display->x_pos + region->width - x_pos;
1362 if (display->y_pos + region->height > y_pos + height) {
1363 height = display->y_pos + region->height - y_pos;
1370 pbuf = av_malloc(width * height * 4);
1372 for (display = ctx->display_list; display; display = display->next) {
1373 region = get_region(ctx, display->region_id);
1375 x_off = display->x_pos - x_pos;
1376 y_off = display->y_pos - y_pos;
1378 clut = get_clut(ctx, region->clut);
1381 clut = &default_clut;
1383 switch (region->depth) {
1385 clut_table = clut->clut4;
1388 clut_table = clut->clut256;
1392 clut_table = clut->clut16;
1396 for (y = 0; y < region->height; y++) {
1397 for (x = 0; x < region->width; x++) {
1398 pbuf[((y + y_off) * width) + x_off + x] =
1399 clut_table[region->pbuf[y * region->width + x]];
1405 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1407 png_save2(filename, pbuf, width, height);
1416 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1420 DVBSubContext *ctx = avctx->priv_data;
1421 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1422 int dds_version, info_byte;
1427 info_byte = bytestream_get_byte(&buf);
1428 dds_version = info_byte >> 4;
1429 if (display_def && display_def->version == dds_version)
1430 return; // already have this display definition version
1433 display_def = av_mallocz(sizeof(*display_def));
1434 ctx->display_definition = display_def;
1439 display_def->version = dds_version;
1442 display_def->width = bytestream_get_be16(&buf) + 1;
1443 display_def->height = bytestream_get_be16(&buf) + 1;
1444 if (!avctx->width || !avctx->height) {
1445 avctx->width = display_def->width;
1446 avctx->height = display_def->height;
1452 if (info_byte & 1<<3) { // display_window_flag
1453 display_def->x = bytestream_get_be16(&buf);
1454 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1455 display_def->y = bytestream_get_be16(&buf);
1456 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1460 static void dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1461 int buf_size, AVSubtitle *sub,int *got_output)
1463 DVBSubContext *ctx = avctx->priv_data;
1465 if(ctx->compute_edt == 0)
1466 save_subtitle_set(avctx, sub, got_output);
1468 save_display_set(ctx);
1473 static int dvbsub_decode(AVCodecContext *avctx,
1474 void *data, int *data_size,
1477 const uint8_t *buf = avpkt->data;
1478 int buf_size = avpkt->size;
1479 DVBSubContext *ctx = avctx->priv_data;
1480 AVSubtitle *sub = data;
1481 const uint8_t *p, *p_end;
1487 int got_segment = 0;
1489 av_dlog(avctx, "DVB sub packet:\n");
1491 for (i=0; i < buf_size; i++) {
1492 av_dlog(avctx, "%02x ", buf[i]);
1494 av_dlog(avctx, "\n");
1498 av_dlog(avctx, "\n");
1500 if (buf_size <= 6 || *buf != 0x0f) {
1501 av_dlog(avctx, "incomplete or broken packet");
1506 p_end = buf + buf_size;
1508 while (p_end - p >= 6 && *p == 0x0f) {
1510 segment_type = *p++;
1511 page_id = AV_RB16(p);
1513 segment_length = AV_RB16(p);
1516 if (avctx->debug & FF_DEBUG_STARTCODE) {
1517 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1520 if (p_end - p < segment_length) {
1521 av_dlog(avctx, "incomplete or broken packet");
1526 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1527 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1528 switch (segment_type) {
1529 case DVBSUB_PAGE_SEGMENT:
1530 dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1533 case DVBSUB_REGION_SEGMENT:
1534 dvbsub_parse_region_segment(avctx, p, segment_length);
1537 case DVBSUB_CLUT_SEGMENT:
1538 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1539 if (ret < 0) goto end;
1542 case DVBSUB_OBJECT_SEGMENT:
1543 dvbsub_parse_object_segment(avctx, p, segment_length);
1546 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1547 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
1549 case DVBSUB_DISPLAY_SEGMENT:
1550 dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1554 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1555 segment_type, page_id, segment_length);
1560 p += segment_length;
1562 // Some streams do not send a display segment but if we have all the other
1563 // segments then we need no further data.
1564 if (got_segment == 15) {
1565 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1566 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1572 avsubtitle_free(sub);
1575 if(ctx->compute_edt == 1 )
1576 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1582 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1583 static const AVOption options[] = {
1584 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DS},
1587 static const AVClass dvbsubdec_class = {
1588 .class_name = "DVB Sub Decoder",
1589 .item_name = av_default_item_name,
1591 .version = LIBAVUTIL_VERSION_INT,
1594 AVCodec ff_dvbsub_decoder = {
1596 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1597 .type = AVMEDIA_TYPE_SUBTITLE,
1598 .id = AV_CODEC_ID_DVB_SUBTITLE,
1599 .priv_data_size = sizeof(DVBSubContext),
1600 .init = dvbsub_init_decoder,
1601 .close = dvbsub_close_decoder,
1602 .decode = dvbsub_decode,
1603 .priv_class = &dvbsubdec_class,