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 DVBSubRegion *region_list;
238 DVBSubCLUT *clut_list;
239 DVBSubObject *object_list;
241 DVBSubRegionDisplay *display_list;
242 DVBSubDisplayDefinition *display_definition;
246 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
248 DVBSubObject *ptr = ctx->object_list;
250 while (ptr && ptr->id != object_id) {
257 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
259 DVBSubCLUT *ptr = ctx->clut_list;
261 while (ptr && ptr->id != clut_id) {
268 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
270 DVBSubRegion *ptr = ctx->region_list;
272 while (ptr && ptr->id != region_id) {
279 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
281 DVBSubObject *object, *obj2, **obj2_ptr;
282 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
284 while (region->display_list) {
285 display = region->display_list;
287 object = get_object(ctx, display->object_id);
290 obj_disp_ptr = &object->display_list;
291 obj_disp = *obj_disp_ptr;
293 while (obj_disp && obj_disp != display) {
294 obj_disp_ptr = &obj_disp->object_list_next;
295 obj_disp = *obj_disp_ptr;
299 *obj_disp_ptr = obj_disp->object_list_next;
301 if (!object->display_list) {
302 obj2_ptr = &ctx->object_list;
305 while (obj2 != object) {
307 obj2_ptr = &obj2->next;
311 *obj2_ptr = obj2->next;
318 region->display_list = display->region_list_next;
325 static void delete_cluts(DVBSubContext *ctx)
329 while (ctx->clut_list) {
330 clut = ctx->clut_list;
332 ctx->clut_list = clut->next;
338 static void delete_objects(DVBSubContext *ctx)
340 DVBSubObject *object;
342 while (ctx->object_list) {
343 object = ctx->object_list;
345 ctx->object_list = object->next;
351 static void delete_regions(DVBSubContext *ctx)
353 DVBSubRegion *region;
355 while (ctx->region_list) {
356 region = ctx->region_list;
358 ctx->region_list = region->next;
360 delete_region_display_list(ctx, region);
362 av_free(region->pbuf);
367 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
369 int i, r, g, b, a = 0;
370 DVBSubContext *ctx = avctx->priv_data;
372 if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
373 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
374 ctx->composition_id = -1;
375 ctx->ancillary_id = -1;
377 if (avctx->extradata_size > 5) {
378 av_log(avctx, AV_LOG_WARNING, "Decoding first DVB subtitles sub-stream\n");
381 ctx->composition_id = AV_RB16(avctx->extradata);
382 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
387 default_clut.id = -1;
388 default_clut.next = NULL;
390 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
391 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
392 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
393 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
395 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
396 for (i = 1; i < 16; i++) {
398 r = (i & 1) ? 255 : 0;
399 g = (i & 2) ? 255 : 0;
400 b = (i & 4) ? 255 : 0;
402 r = (i & 1) ? 127 : 0;
403 g = (i & 2) ? 127 : 0;
404 b = (i & 4) ? 127 : 0;
406 default_clut.clut16[i] = RGBA(r, g, b, 255);
409 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
410 for (i = 1; i < 256; i++) {
412 r = (i & 1) ? 255 : 0;
413 g = (i & 2) ? 255 : 0;
414 b = (i & 4) ? 255 : 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 = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
426 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
427 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
431 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
432 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
433 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
437 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
438 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
439 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
444 default_clut.clut256[i] = RGBA(r, g, b, a);
450 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
452 DVBSubContext *ctx = avctx->priv_data;
453 DVBSubRegionDisplay *display;
461 av_freep(&ctx->display_definition);
463 while (ctx->display_list) {
464 display = ctx->display_list;
465 ctx->display_list = display->next;
473 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
474 const uint8_t **srcbuf, int buf_size,
475 int non_mod, uint8_t *map_table, int x_pos)
481 int pixels_read = x_pos;
483 init_get_bits(&gb, *srcbuf, buf_size << 3);
487 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
488 bits = get_bits(&gb, 2);
491 if (non_mod != 1 || bits != 1) {
493 *destbuf++ = map_table[bits];
499 bits = get_bits1(&gb);
501 run_length = get_bits(&gb, 3) + 3;
502 bits = get_bits(&gb, 2);
504 if (non_mod == 1 && bits == 1)
505 pixels_read += run_length;
508 bits = map_table[bits];
509 while (run_length-- > 0 && pixels_read < dbuf_len) {
515 bits = get_bits1(&gb);
517 bits = get_bits(&gb, 2);
519 run_length = get_bits(&gb, 4) + 12;
520 bits = get_bits(&gb, 2);
522 if (non_mod == 1 && bits == 1)
523 pixels_read += run_length;
526 bits = map_table[bits];
527 while (run_length-- > 0 && pixels_read < dbuf_len) {
532 } else if (bits == 3) {
533 run_length = get_bits(&gb, 8) + 29;
534 bits = get_bits(&gb, 2);
536 if (non_mod == 1 && bits == 1)
537 pixels_read += run_length;
540 bits = map_table[bits];
541 while (run_length-- > 0 && pixels_read < dbuf_len) {
546 } else if (bits == 1) {
552 while (run_length-- > 0 && pixels_read < dbuf_len) {
557 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
572 if (get_bits(&gb, 6))
573 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
575 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
580 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
581 const uint8_t **srcbuf, int buf_size,
582 int non_mod, uint8_t *map_table, int x_pos)
588 int pixels_read = x_pos;
590 init_get_bits(&gb, *srcbuf, buf_size << 3);
594 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
595 bits = get_bits(&gb, 4);
598 if (non_mod != 1 || bits != 1) {
600 *destbuf++ = map_table[bits];
606 bits = get_bits1(&gb);
608 run_length = get_bits(&gb, 3);
610 if (run_length == 0) {
611 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
622 while (run_length-- > 0 && pixels_read < dbuf_len) {
627 bits = get_bits1(&gb);
629 run_length = get_bits(&gb, 2) + 4;
630 bits = get_bits(&gb, 4);
632 if (non_mod == 1 && bits == 1)
633 pixels_read += run_length;
636 bits = map_table[bits];
637 while (run_length-- > 0 && pixels_read < dbuf_len) {
643 bits = get_bits(&gb, 2);
645 run_length = get_bits(&gb, 4) + 9;
646 bits = get_bits(&gb, 4);
648 if (non_mod == 1 && bits == 1)
649 pixels_read += run_length;
652 bits = map_table[bits];
653 while (run_length-- > 0 && pixels_read < dbuf_len) {
658 } else if (bits == 3) {
659 run_length = get_bits(&gb, 8) + 25;
660 bits = get_bits(&gb, 4);
662 if (non_mod == 1 && bits == 1)
663 pixels_read += run_length;
666 bits = map_table[bits];
667 while (run_length-- > 0 && pixels_read < dbuf_len) {
672 } else if (bits == 1) {
678 while (run_length-- > 0 && pixels_read < dbuf_len) {
695 if (get_bits(&gb, 8))
696 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
698 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
703 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
704 const uint8_t **srcbuf, int buf_size,
705 int non_mod, uint8_t *map_table, int x_pos)
707 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
710 int pixels_read = x_pos;
714 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
718 if (non_mod != 1 || bits != 1) {
720 *destbuf++ = map_table[bits];
727 run_length = bits & 0x7f;
728 if ((bits & 0x80) == 0) {
729 if (run_length == 0) {
737 while (run_length-- > 0 && pixels_read < dbuf_len) {
744 if (non_mod == 1 && bits == 1)
745 pixels_read += run_length;
747 bits = map_table[bits];
748 else while (run_length-- > 0 && pixels_read < dbuf_len) {
757 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
762 static void save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub)
764 DVBSubContext *ctx = avctx->priv_data;
765 DVBSubRegionDisplay *display;
766 DVBSubDisplayDefinition *display_def = ctx->display_definition;
767 DVBSubRegion *region;
768 AVSubtitleRect *rect;
770 uint32_t *clut_table;
772 int offset_x=0, offset_y=0;
774 sub->end_display_time = ctx->time_out * 1000;
777 offset_x = display_def->x;
778 offset_y = display_def->y;
782 for (display = ctx->display_list; display; display = display->next) {
783 region = get_region(ctx, display->region_id);
784 if (region && region->dirty)
788 if (sub->num_rects > 0) {
789 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
790 for(i=0; i<sub->num_rects; i++)
791 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
795 for (display = ctx->display_list; display; display = display->next) {
796 region = get_region(ctx, display->region_id);
804 rect = sub->rects[i];
805 rect->x = display->x_pos + offset_x;
806 rect->y = display->y_pos + offset_y;
807 rect->w = region->width;
808 rect->h = region->height;
809 rect->nb_colors = (1 << region->depth);
810 rect->type = SUBTITLE_BITMAP;
811 rect->pict.linesize[0] = region->width;
813 clut = get_clut(ctx, region->clut);
816 clut = &default_clut;
818 switch (region->depth) {
820 clut_table = clut->clut4;
823 clut_table = clut->clut256;
827 clut_table = clut->clut16;
831 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
832 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
834 rect->pict.data[0] = av_malloc(region->buf_size);
835 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
842 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
843 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
845 DVBSubContext *ctx = avctx->priv_data;
847 DVBSubRegion *region = get_region(ctx, display->region_id);
848 const uint8_t *buf_end = buf + buf_size;
853 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
854 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
855 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
856 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
860 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
861 top_bottom ? "bottom" : "top");
863 for (i = 0; i < buf_size; i++) {
865 av_dlog(avctx, "0x%8p: ", buf+i);
867 av_dlog(avctx, "%02x ", buf[i]);
869 av_dlog(avctx, "\n");
873 av_dlog(avctx, "\n");
882 x_pos = display->x_pos;
883 y_pos = display->y_pos;
887 while (buf < buf_end) {
888 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
889 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
895 if (region->depth == 8)
897 else if (region->depth == 4)
902 x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width),
903 region->width, &buf, buf_end - buf,
904 non_mod, map_table, x_pos);
907 if (region->depth < 4) {
908 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
912 if (region->depth == 8)
917 x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width),
918 region->width, &buf, buf_end - buf,
919 non_mod, map_table, x_pos);
922 if (region->depth < 8) {
923 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
927 x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width),
928 region->width, &buf, buf_end - buf,
929 non_mod, NULL, x_pos);
933 map2to4[0] = (*buf) >> 4;
934 map2to4[1] = (*buf++) & 0xf;
935 map2to4[2] = (*buf) >> 4;
936 map2to4[3] = (*buf++) & 0xf;
939 for (i = 0; i < 4; i++)
943 for (i = 0; i < 16; i++)
948 x_pos = display->x_pos;
952 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
958 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
959 const uint8_t *buf, int buf_size)
961 DVBSubContext *ctx = avctx->priv_data;
963 const uint8_t *buf_end = buf + buf_size;
965 DVBSubObject *object;
966 DVBSubObjectDisplay *display;
967 int top_field_len, bottom_field_len;
969 int coding_method, non_modifying_color;
971 object_id = AV_RB16(buf);
974 object = get_object(ctx, object_id);
979 coding_method = ((*buf) >> 2) & 3;
980 non_modifying_color = ((*buf++) >> 1) & 1;
982 if (coding_method == 0) {
983 top_field_len = AV_RB16(buf);
985 bottom_field_len = AV_RB16(buf);
988 if (buf + top_field_len + bottom_field_len > buf_end) {
989 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
993 for (display = object->display_list; display; display = display->object_list_next) {
994 const uint8_t *block = buf;
995 int bfl = bottom_field_len;
997 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
998 non_modifying_color);
1000 if (bottom_field_len > 0)
1001 block = buf + top_field_len;
1003 bfl = top_field_len;
1005 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1006 non_modifying_color);
1009 /* } else if (coding_method == 1) {*/
1012 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1017 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1018 const uint8_t *buf, int buf_size)
1020 DVBSubContext *ctx = avctx->priv_data;
1022 const uint8_t *buf_end = buf + buf_size;
1026 int entry_id, depth , full_range;
1027 int y, cr, cb, alpha;
1028 int r, g, b, r_add, g_add, b_add;
1030 av_dlog(avctx, "DVB clut packet:\n");
1032 for (i=0; i < buf_size; i++) {
1033 av_dlog(avctx, "%02x ", buf[i]);
1035 av_dlog(avctx, "\n");
1039 av_dlog(avctx, "\n");
1042 version = ((*buf)>>4)&15;
1045 clut = get_clut(ctx, clut_id);
1048 clut = av_malloc(sizeof(DVBSubCLUT));
1050 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1055 clut->next = ctx->clut_list;
1056 ctx->clut_list = clut;
1059 if (clut->version != version) {
1061 clut->version = version;
1063 while (buf + 4 < buf_end) {
1066 depth = (*buf) & 0xe0;
1069 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1073 full_range = (*buf++) & 1;
1082 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1083 cb = (buf[1] << 2) & 0xf0;
1084 alpha = (buf[1] << 6) & 0xc0;
1092 YUV_TO_RGB1_CCIR(cb, cr);
1093 YUV_TO_RGB2_CCIR(r, g, b, y);
1095 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1096 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1097 av_dlog(avctx, "More than one bit level marked: %x\n", depth);
1098 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1099 return AVERROR_INVALIDDATA;
1103 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1104 else if (depth & 0x40)
1105 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1106 else if (depth & 0x20)
1107 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1114 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1115 const uint8_t *buf, int buf_size)
1117 DVBSubContext *ctx = avctx->priv_data;
1119 const uint8_t *buf_end = buf + buf_size;
1120 int region_id, object_id;
1121 int av_unused version;
1122 DVBSubRegion *region;
1123 DVBSubObject *object;
1124 DVBSubObjectDisplay *display;
1132 region = get_region(ctx, region_id);
1135 region = av_mallocz(sizeof(DVBSubRegion));
1137 region->id = region_id;
1138 region->version = -1;
1140 region->next = ctx->region_list;
1141 ctx->region_list = region;
1144 version = ((*buf)>>4) & 15;
1145 fill = ((*buf++) >> 3) & 1;
1147 region->width = AV_RB16(buf);
1149 region->height = AV_RB16(buf);
1152 if (region->width * region->height != region->buf_size) {
1153 av_free(region->pbuf);
1155 region->buf_size = region->width * region->height;
1157 region->pbuf = av_malloc(region->buf_size);
1163 region->depth = 1 << (((*buf++) >> 2) & 7);
1164 if(region->depth<2 || region->depth>8){
1165 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1168 region->clut = *buf++;
1170 if (region->depth == 8) {
1171 region->bgcolor = *buf++;
1176 if (region->depth == 4)
1177 region->bgcolor = (((*buf++) >> 4) & 15);
1179 region->bgcolor = (((*buf++) >> 2) & 3);
1182 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1185 memset(region->pbuf, region->bgcolor, region->buf_size);
1186 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1189 delete_region_display_list(ctx, region);
1191 while (buf + 5 < buf_end) {
1192 object_id = AV_RB16(buf);
1195 object = get_object(ctx, object_id);
1198 object = av_mallocz(sizeof(DVBSubObject));
1200 object->id = object_id;
1201 object->next = ctx->object_list;
1202 ctx->object_list = object;
1205 object->type = (*buf) >> 6;
1207 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1209 display->object_id = object_id;
1210 display->region_id = region_id;
1212 display->x_pos = AV_RB16(buf) & 0xfff;
1214 display->y_pos = AV_RB16(buf) & 0xfff;
1217 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1218 display->fgcolor = *buf++;
1219 display->bgcolor = *buf++;
1222 display->region_list_next = region->display_list;
1223 region->display_list = display;
1225 display->object_list_next = object->display_list;
1226 object->display_list = display;
1230 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1231 const uint8_t *buf, int buf_size, AVSubtitle *sub)
1233 DVBSubContext *ctx = avctx->priv_data;
1234 DVBSubRegionDisplay *display;
1235 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1237 const uint8_t *buf_end = buf + buf_size;
1247 version = ((*buf)>>4) & 15;
1248 page_state = ((*buf++) >> 2) & 3;
1250 if (ctx->version == version) {
1254 ctx->time_out = timeout;
1255 ctx->version = version;
1257 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1259 if (page_state == 1 || page_state == 2) {
1260 delete_regions(ctx);
1261 delete_objects(ctx);
1265 tmp_display_list = ctx->display_list;
1266 ctx->display_list = NULL;
1268 while (buf + 5 < buf_end) {
1272 display = tmp_display_list;
1273 tmp_ptr = &tmp_display_list;
1275 while (display && display->region_id != region_id) {
1276 tmp_ptr = &display->next;
1277 display = display->next;
1281 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1283 display->region_id = region_id;
1285 display->x_pos = AV_RB16(buf);
1287 display->y_pos = AV_RB16(buf);
1290 *tmp_ptr = display->next;
1292 display->next = ctx->display_list;
1293 ctx->display_list = display;
1295 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1298 while (tmp_display_list) {
1299 display = tmp_display_list;
1301 tmp_display_list = display->next;
1310 static void save_display_set(DVBSubContext *ctx)
1312 DVBSubRegion *region;
1313 DVBSubRegionDisplay *display;
1315 uint32_t *clut_table;
1316 int x_pos, y_pos, width, height;
1317 int x, y, y_off, x_off;
1320 static int fileno_index = 0;
1327 for (display = ctx->display_list; display; display = display->next) {
1328 region = get_region(ctx, display->region_id);
1331 x_pos = display->x_pos;
1332 y_pos = display->y_pos;
1333 width = region->width;
1334 height = region->height;
1336 if (display->x_pos < x_pos) {
1337 width += (x_pos - display->x_pos);
1338 x_pos = display->x_pos;
1341 if (display->y_pos < y_pos) {
1342 height += (y_pos - display->y_pos);
1343 y_pos = display->y_pos;
1346 if (display->x_pos + region->width > x_pos + width) {
1347 width = display->x_pos + region->width - x_pos;
1350 if (display->y_pos + region->height > y_pos + height) {
1351 height = display->y_pos + region->height - y_pos;
1358 pbuf = av_malloc(width * height * 4);
1360 for (display = ctx->display_list; display; display = display->next) {
1361 region = get_region(ctx, display->region_id);
1363 x_off = display->x_pos - x_pos;
1364 y_off = display->y_pos - y_pos;
1366 clut = get_clut(ctx, region->clut);
1369 clut = &default_clut;
1371 switch (region->depth) {
1373 clut_table = clut->clut4;
1376 clut_table = clut->clut256;
1380 clut_table = clut->clut16;
1384 for (y = 0; y < region->height; y++) {
1385 for (x = 0; x < region->width; x++) {
1386 pbuf[((y + y_off) * width) + x_off + x] =
1387 clut_table[region->pbuf[y * region->width + x]];
1393 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1395 png_save2(filename, pbuf, width, height);
1404 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1408 DVBSubContext *ctx = avctx->priv_data;
1409 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1410 int dds_version, info_byte;
1415 info_byte = bytestream_get_byte(&buf);
1416 dds_version = info_byte >> 4;
1417 if (display_def && display_def->version == dds_version)
1418 return; // already have this display definition version
1421 display_def = av_mallocz(sizeof(*display_def));
1422 ctx->display_definition = display_def;
1427 display_def->version = dds_version;
1430 display_def->width = bytestream_get_be16(&buf) + 1;
1431 display_def->height = bytestream_get_be16(&buf) + 1;
1432 if (!avctx->width || !avctx->height) {
1433 avctx->width = display_def->width;
1434 avctx->height = display_def->height;
1440 if (info_byte & 1<<3) { // display_window_flag
1441 display_def->x = bytestream_get_be16(&buf);
1442 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1443 display_def->y = bytestream_get_be16(&buf);
1444 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1448 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1449 int buf_size, AVSubtitle *sub)
1451 DVBSubContext *ctx = avctx->priv_data;
1453 save_subtitle_set(avctx,sub);
1455 save_display_set(ctx);
1461 static int dvbsub_decode(AVCodecContext *avctx,
1462 void *data, int *data_size,
1465 const uint8_t *buf = avpkt->data;
1466 int buf_size = avpkt->size;
1467 DVBSubContext *ctx = avctx->priv_data;
1468 AVSubtitle *sub = data;
1469 const uint8_t *p, *p_end;
1475 int got_segment = 0;
1477 av_dlog(avctx, "DVB sub packet:\n");
1479 for (i=0; i < buf_size; i++) {
1480 av_dlog(avctx, "%02x ", buf[i]);
1482 av_dlog(avctx, "\n");
1486 av_dlog(avctx, "\n");
1488 if (buf_size <= 6 || *buf != 0x0f) {
1489 av_dlog(avctx, "incomplete or broken packet");
1494 p_end = buf + buf_size;
1496 while (p_end - p >= 6 && *p == 0x0f) {
1498 segment_type = *p++;
1499 page_id = AV_RB16(p);
1501 segment_length = AV_RB16(p);
1504 if (avctx->debug & FF_DEBUG_STARTCODE) {
1505 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1508 if (p_end - p < segment_length) {
1509 av_dlog(avctx, "incomplete or broken packet");
1513 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1514 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1515 switch (segment_type) {
1516 case DVBSUB_PAGE_SEGMENT:
1517 dvbsub_parse_page_segment(avctx, p, segment_length, sub);
1520 case DVBSUB_REGION_SEGMENT:
1521 dvbsub_parse_region_segment(avctx, p, segment_length);
1524 case DVBSUB_CLUT_SEGMENT:
1525 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1526 if (ret < 0) return ret;
1529 case DVBSUB_OBJECT_SEGMENT:
1530 dvbsub_parse_object_segment(avctx, p, segment_length);
1533 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1534 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
1536 case DVBSUB_DISPLAY_SEGMENT:
1537 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1541 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1542 segment_type, page_id, segment_length);
1547 p += segment_length;
1549 // Some streams do not send a display segment but if we have all the other
1550 // segments then we need no further data.
1551 if (got_segment == 15 && sub) {
1552 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1553 *data_size = dvbsub_display_end_segment(avctx, p, 0, sub);
1559 static const AVOption options[] = {
1562 static const AVClass dvbsubdec_class = {
1563 .class_name = "DVB Sub Decoder",
1564 .item_name = av_default_item_name,
1566 .version = LIBAVUTIL_VERSION_INT,
1569 AVCodec ff_dvbsub_decoder = {
1571 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1572 .type = AVMEDIA_TYPE_SUBTITLE,
1573 .id = AV_CODEC_ID_DVB_SUBTITLE,
1574 .priv_data_size = sizeof(DVBSubContext),
1575 .init = dvbsub_init_decoder,
1576 .close = dvbsub_close_decoder,
1577 .decode = dvbsub_decode,
1578 .priv_class = &dvbsubdec_class,