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"
26 #include "libavutil/colorspace.h"
27 #include "libavutil/opt.h"
29 #define DVBSUB_PAGE_SEGMENT 0x10
30 #define DVBSUB_REGION_SEGMENT 0x11
31 #define DVBSUB_CLUT_SEGMENT 0x12
32 #define DVBSUB_OBJECT_SEGMENT 0x13
33 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
34 #define DVBSUB_DISPLAY_SEGMENT 0x80
36 #define cm (ff_crop_tab + MAX_NEG_CROP)
40 static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
41 uint32_t *rgba_palette)
45 char fname[40], fname2[40];
48 snprintf(fname, 40, "%s.ppm", filename);
50 f = fopen(fname, "w");
59 for(y = 0; y < h; y++) {
60 for(x = 0; x < w; x++) {
61 v = rgba_palette[bitmap[y * w + x]];
62 putc((v >> 16) & 0xff, f);
63 putc((v >> 8) & 0xff, f);
64 putc((v >> 0) & 0xff, f);
70 snprintf(fname2, 40, "%s-a.pgm", filename);
72 f = fopen(fname2, "w");
81 for(y = 0; y < h; y++) {
82 for(x = 0; x < w; x++) {
83 v = rgba_palette[bitmap[y * w + x]];
84 putc((v >> 24) & 0xff, f);
89 snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
92 snprintf(command, 1024, "rm %s %s", fname, fname2);
97 static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
101 char fname[40], fname2[40];
104 snprintf(fname, sizeof(fname), "%s.ppm", filename);
106 f = fopen(fname, "w");
115 for(y = 0; y < h; y++) {
116 for(x = 0; x < w; x++) {
117 v = bitmap[y * w + x];
118 putc((v >> 16) & 0xff, f);
119 putc((v >> 8) & 0xff, f);
120 putc((v >> 0) & 0xff, f);
126 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
128 f = fopen(fname2, "w");
137 for(y = 0; y < h; y++) {
138 for(x = 0; x < w; x++) {
139 v = bitmap[y * w + x];
140 putc((v >> 24) & 0xff, f);
145 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
148 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
153 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
155 typedef struct DVBSubCLUT {
161 uint32_t clut256[256];
163 struct DVBSubCLUT *next;
166 static DVBSubCLUT default_clut;
168 typedef struct DVBSubObjectDisplay {
178 struct DVBSubObjectDisplay *region_list_next;
179 struct DVBSubObjectDisplay *object_list_next;
180 } DVBSubObjectDisplay;
182 typedef struct DVBSubObject {
188 DVBSubObjectDisplay *display_list;
190 struct DVBSubObject *next;
193 typedef struct DVBSubRegionDisplay {
199 struct DVBSubRegionDisplay *next;
200 } DVBSubRegionDisplay;
202 typedef struct DVBSubRegion {
217 DVBSubObjectDisplay *display_list;
219 struct DVBSubRegion *next;
222 typedef struct DVBSubDisplayDefinition {
229 } DVBSubDisplayDefinition;
231 typedef struct DVBSubContext {
238 int compute_edt; /**< if 1 end display time calculated using pts
239 if 0 (Default) calculated using time out */
243 DVBSubRegion *region_list;
244 DVBSubCLUT *clut_list;
245 DVBSubObject *object_list;
247 DVBSubRegionDisplay *display_list;
248 DVBSubDisplayDefinition *display_definition;
252 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
254 DVBSubObject *ptr = ctx->object_list;
256 while (ptr && ptr->id != object_id) {
263 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
265 DVBSubCLUT *ptr = ctx->clut_list;
267 while (ptr && ptr->id != clut_id) {
274 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
276 DVBSubRegion *ptr = ctx->region_list;
278 while (ptr && ptr->id != region_id) {
285 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
287 DVBSubObject *object, *obj2, **obj2_ptr;
288 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
290 while (region->display_list) {
291 display = region->display_list;
293 object = get_object(ctx, display->object_id);
296 obj_disp_ptr = &object->display_list;
297 obj_disp = *obj_disp_ptr;
299 while (obj_disp && obj_disp != display) {
300 obj_disp_ptr = &obj_disp->object_list_next;
301 obj_disp = *obj_disp_ptr;
305 *obj_disp_ptr = obj_disp->object_list_next;
307 if (!object->display_list) {
308 obj2_ptr = &ctx->object_list;
311 while (obj2 != object) {
313 obj2_ptr = &obj2->next;
317 *obj2_ptr = obj2->next;
324 region->display_list = display->region_list_next;
331 static void delete_cluts(DVBSubContext *ctx)
333 while (ctx->clut_list) {
334 DVBSubCLUT *clut = ctx->clut_list;
336 ctx->clut_list = clut->next;
342 static void delete_objects(DVBSubContext *ctx)
344 while (ctx->object_list) {
345 DVBSubObject *object = ctx->object_list;
347 ctx->object_list = object->next;
353 static void delete_regions(DVBSubContext *ctx)
355 while (ctx->region_list) {
356 DVBSubRegion *region = ctx->region_list;
358 ctx->region_list = region->next;
360 delete_region_display_list(ctx, region);
362 av_freep(®ion->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 (ctx->substream < 0) {
373 ctx->composition_id = -1;
374 ctx->ancillary_id = -1;
375 } else 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*ctx->substream + 2) {
381 ctx->composition_id = AV_RB16(avctx->extradata + 5*ctx->substream);
382 ctx->ancillary_id = AV_RB16(avctx->extradata + 5*ctx->substream + 2);
384 av_log(avctx, AV_LOG_WARNING, "Selected DVB subtitles sub-stream %d is not available\n", ctx->substream);
385 ctx->composition_id = AV_RB16(avctx->extradata);
386 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
391 ctx->prev_start = AV_NOPTS_VALUE;
393 default_clut.id = -1;
394 default_clut.next = NULL;
396 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
397 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
398 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
399 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
401 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
402 for (i = 1; i < 16; i++) {
404 r = (i & 1) ? 255 : 0;
405 g = (i & 2) ? 255 : 0;
406 b = (i & 4) ? 255 : 0;
408 r = (i & 1) ? 127 : 0;
409 g = (i & 2) ? 127 : 0;
410 b = (i & 4) ? 127 : 0;
412 default_clut.clut16[i] = RGBA(r, g, b, 255);
415 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
416 for (i = 1; i < 256; i++) {
418 r = (i & 1) ? 255 : 0;
419 g = (i & 2) ? 255 : 0;
420 b = (i & 4) ? 255 : 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 = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
432 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
433 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
437 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
438 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
439 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
443 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
444 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
445 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
450 default_clut.clut256[i] = RGBA(r, g, b, a);
456 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
458 DVBSubContext *ctx = avctx->priv_data;
459 DVBSubRegionDisplay *display;
467 av_freep(&ctx->display_definition);
469 while (ctx->display_list) {
470 display = ctx->display_list;
471 ctx->display_list = display->next;
479 static int dvbsub_read_2bit_string(AVCodecContext *avctx,
480 uint8_t *destbuf, int dbuf_len,
481 const uint8_t **srcbuf, int buf_size,
482 int non_mod, uint8_t *map_table, int x_pos)
488 int pixels_read = x_pos;
490 init_get_bits(&gb, *srcbuf, buf_size << 3);
494 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
495 bits = get_bits(&gb, 2);
498 if (non_mod != 1 || bits != 1) {
500 *destbuf++ = map_table[bits];
506 bits = get_bits1(&gb);
508 run_length = get_bits(&gb, 3) + 3;
509 bits = get_bits(&gb, 2);
511 if (non_mod == 1 && bits == 1)
512 pixels_read += run_length;
515 bits = map_table[bits];
516 while (run_length-- > 0 && pixels_read < dbuf_len) {
522 bits = get_bits1(&gb);
524 bits = get_bits(&gb, 2);
526 run_length = get_bits(&gb, 4) + 12;
527 bits = get_bits(&gb, 2);
529 if (non_mod == 1 && bits == 1)
530 pixels_read += run_length;
533 bits = map_table[bits];
534 while (run_length-- > 0 && pixels_read < dbuf_len) {
539 } else if (bits == 3) {
540 run_length = get_bits(&gb, 8) + 29;
541 bits = get_bits(&gb, 2);
543 if (non_mod == 1 && bits == 1)
544 pixels_read += run_length;
547 bits = map_table[bits];
548 while (run_length-- > 0 && pixels_read < dbuf_len) {
553 } else if (bits == 1) {
559 while (run_length-- > 0 && pixels_read < dbuf_len) {
564 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
579 if (get_bits(&gb, 6))
580 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
582 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
587 static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
588 const uint8_t **srcbuf, int buf_size,
589 int non_mod, uint8_t *map_table, int x_pos)
595 int pixels_read = x_pos;
597 init_get_bits(&gb, *srcbuf, buf_size << 3);
601 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
602 bits = get_bits(&gb, 4);
605 if (non_mod != 1 || bits != 1) {
607 *destbuf++ = map_table[bits];
613 bits = get_bits1(&gb);
615 run_length = get_bits(&gb, 3);
617 if (run_length == 0) {
618 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
629 while (run_length-- > 0 && pixels_read < dbuf_len) {
634 bits = get_bits1(&gb);
636 run_length = get_bits(&gb, 2) + 4;
637 bits = get_bits(&gb, 4);
639 if (non_mod == 1 && bits == 1)
640 pixels_read += run_length;
643 bits = map_table[bits];
644 while (run_length-- > 0 && pixels_read < dbuf_len) {
650 bits = get_bits(&gb, 2);
652 run_length = get_bits(&gb, 4) + 9;
653 bits = get_bits(&gb, 4);
655 if (non_mod == 1 && bits == 1)
656 pixels_read += run_length;
659 bits = map_table[bits];
660 while (run_length-- > 0 && pixels_read < dbuf_len) {
665 } else if (bits == 3) {
666 run_length = get_bits(&gb, 8) + 25;
667 bits = get_bits(&gb, 4);
669 if (non_mod == 1 && bits == 1)
670 pixels_read += run_length;
673 bits = map_table[bits];
674 while (run_length-- > 0 && pixels_read < dbuf_len) {
679 } else if (bits == 1) {
685 while (run_length-- > 0 && pixels_read < dbuf_len) {
702 if (get_bits(&gb, 8))
703 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
705 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
710 static int dvbsub_read_8bit_string(AVCodecContext *avctx,
711 uint8_t *destbuf, int dbuf_len,
712 const uint8_t **srcbuf, int buf_size,
713 int non_mod, uint8_t *map_table, int x_pos)
715 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
718 int pixels_read = x_pos;
722 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
726 if (non_mod != 1 || bits != 1) {
728 *destbuf++ = map_table[bits];
735 run_length = bits & 0x7f;
736 if ((bits & 0x80) == 0) {
737 if (run_length == 0) {
745 if (non_mod == 1 && bits == 1)
746 pixels_read += run_length;
749 bits = map_table[bits];
750 while (run_length-- > 0 && pixels_read < dbuf_len) {
759 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
764 static void compute_default_clut(AVSubtitleRect *rect, int w, int h)
766 uint8_t list[256] = {0};
767 uint8_t list_inv[256];
768 int counttab[256] = {0};
771 #define V(x,y) rect->data[0][(x) + (y)*rect->linesize[0]]
772 for (y = 0; y<h; y++) {
773 for (x = 0; x<w; x++) {
775 int vl = x ? V(x-1,y) + 1 : 0;
776 int vr = x+1<w ? V(x+1,y) + 1 : 0;
777 int vt = y ? V(x,y-1) + 1 : 0;
778 int vb = y+1<h ? V(x,y+1) + 1 : 0;
779 counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
782 #define L(x,y) list[ rect->data[0][(x) + (y)*rect->linesize[0]] ]
784 for (i = 0; i<256; i++) {
785 int scoretab[256] = {0};
788 for (y = 0; y<h; y++) {
789 for (x = 0; x<w; x++) {
790 int v = rect->data[0][x + y*rect->linesize[0]];
792 int l_l = x ? L(x-1, y) : 1;
793 int l_r = x+1<w ? L(x+1, y) : 1;
794 int l_t = y ? L(x, y-1) : 1;
795 int l_b = y+1<h ? L(x, y+1) : 1;
799 scoretab[v] += l_l + l_r + l_t + l_b;
800 score = 1024LL*scoretab[v] / counttab[v];
801 if (score > bestscore) {
810 list_inv[ i ] = bestv;
813 count = FFMAX(i - 1, 1);
814 for (i--; i>=0; i--) {
816 AV_WN32(rect->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
821 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
823 DVBSubContext *ctx = avctx->priv_data;
824 DVBSubRegionDisplay *display;
825 DVBSubDisplayDefinition *display_def = ctx->display_definition;
826 DVBSubRegion *region;
827 AVSubtitleRect *rect;
829 uint32_t *clut_table;
831 int offset_x=0, offset_y=0;
836 offset_x = display_def->x;
837 offset_y = display_def->y;
840 /* Not touching AVSubtitles again*/
842 avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
843 return AVERROR_PATCHWELCOME;
845 for (display = ctx->display_list; display; display = display->next) {
846 region = get_region(ctx, display->region_id);
847 if (region && region->dirty)
851 if(ctx->compute_edt == 0) {
852 sub->end_display_time = ctx->time_out * 1000;
854 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
855 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
858 if (sub->num_rects > 0) {
860 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
862 ret = AVERROR(ENOMEM);
866 for(i=0; i<sub->num_rects; i++)
867 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
871 for (display = ctx->display_list; display; display = display->next) {
872 region = get_region(ctx, display->region_id);
880 rect = sub->rects[i];
881 rect->x = display->x_pos + offset_x;
882 rect->y = display->y_pos + offset_y;
883 rect->w = region->width;
884 rect->h = region->height;
885 rect->nb_colors = (1 << region->depth);
886 rect->type = SUBTITLE_BITMAP;
887 rect->linesize[0] = region->width;
889 clut = get_clut(ctx, region->clut);
892 clut = &default_clut;
894 switch (region->depth) {
896 clut_table = clut->clut4;
899 clut_table = clut->clut256;
903 clut_table = clut->clut16;
907 rect->data[1] = av_mallocz(AVPALETTE_SIZE);
908 if (!rect->data[1]) {
909 ret = AVERROR(ENOMEM);
912 memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
914 rect->data[0] = av_malloc(region->buf_size);
915 if (!rect->data[0]) {
916 ret = AVERROR(ENOMEM);
920 memcpy(rect->data[0], region->pbuf, region->buf_size);
922 if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
923 compute_default_clut(rect, rect->w, rect->h);
926 FF_DISABLE_DEPRECATION_WARNINGS
929 for (j = 0; j < 4; j++) {
930 rect->pict.data[j] = rect->data[j];
931 rect->pict.linesize[j] = rect->linesize[j];
934 FF_ENABLE_DEPRECATION_WARNINGS
944 for(i=0; i<sub->num_rects; i++) {
945 rect = sub->rects[i];
947 av_freep(&rect->data[0]);
948 av_freep(&rect->data[1]);
950 av_freep(&sub->rects[i]);
952 av_freep(&sub->rects);
958 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
959 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
961 DVBSubContext *ctx = avctx->priv_data;
963 DVBSubRegion *region = get_region(ctx, display->region_id);
964 const uint8_t *buf_end = buf + buf_size;
969 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
970 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
971 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
972 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
976 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
977 top_bottom ? "bottom" : "top");
979 for (i = 0; i < buf_size; i++) {
981 ff_dlog(avctx, "0x%8p: ", buf+i);
983 ff_dlog(avctx, "%02x ", buf[i]);
985 ff_dlog(avctx, "\n");
989 ff_dlog(avctx, "\n");
998 x_pos = display->x_pos;
999 y_pos = display->y_pos;
1001 y_pos += top_bottom;
1003 while (buf < buf_end) {
1004 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
1005 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
1011 if (region->depth == 8)
1012 map_table = map2to8;
1013 else if (region->depth == 4)
1014 map_table = map2to4;
1018 x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
1019 region->width, &buf, buf_end - buf,
1020 non_mod, map_table, x_pos);
1023 if (region->depth < 4) {
1024 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
1028 if (region->depth == 8)
1029 map_table = map4to8;
1033 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
1034 region->width, &buf, buf_end - buf,
1035 non_mod, map_table, x_pos);
1038 if (region->depth < 8) {
1039 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
1043 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
1044 region->width, &buf, buf_end - buf,
1045 non_mod, NULL, x_pos);
1049 map2to4[0] = (*buf) >> 4;
1050 map2to4[1] = (*buf++) & 0xf;
1051 map2to4[2] = (*buf) >> 4;
1052 map2to4[3] = (*buf++) & 0xf;
1055 for (i = 0; i < 4; i++)
1056 map2to8[i] = *buf++;
1059 for (i = 0; i < 16; i++)
1060 map4to8[i] = *buf++;
1064 x_pos = display->x_pos;
1068 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
1074 static int dvbsub_parse_object_segment(AVCodecContext *avctx,
1075 const uint8_t *buf, int buf_size)
1077 DVBSubContext *ctx = avctx->priv_data;
1079 const uint8_t *buf_end = buf + buf_size;
1081 DVBSubObject *object;
1082 DVBSubObjectDisplay *display;
1083 int top_field_len, bottom_field_len;
1085 int coding_method, non_modifying_color;
1087 object_id = AV_RB16(buf);
1090 object = get_object(ctx, object_id);
1093 return AVERROR_INVALIDDATA;
1095 coding_method = ((*buf) >> 2) & 3;
1096 non_modifying_color = ((*buf++) >> 1) & 1;
1098 if (coding_method == 0) {
1099 top_field_len = AV_RB16(buf);
1101 bottom_field_len = AV_RB16(buf);
1104 if (buf + top_field_len + bottom_field_len > buf_end) {
1105 av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1106 return AVERROR_INVALIDDATA;
1109 for (display = object->display_list; display; display = display->object_list_next) {
1110 const uint8_t *block = buf;
1111 int bfl = bottom_field_len;
1113 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1114 non_modifying_color);
1116 if (bottom_field_len > 0)
1117 block = buf + top_field_len;
1119 bfl = top_field_len;
1121 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1122 non_modifying_color);
1125 /* } else if (coding_method == 1) {*/
1128 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1134 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1135 const uint8_t *buf, int buf_size)
1137 DVBSubContext *ctx = avctx->priv_data;
1139 const uint8_t *buf_end = buf + buf_size;
1143 int entry_id, depth , full_range;
1144 int y, cr, cb, alpha;
1145 int r, g, b, r_add, g_add, b_add;
1147 ff_dlog(avctx, "DVB clut packet:\n");
1149 for (i=0; i < buf_size; i++) {
1150 ff_dlog(avctx, "%02x ", buf[i]);
1152 ff_dlog(avctx, "\n");
1156 ff_dlog(avctx, "\n");
1159 version = ((*buf)>>4)&15;
1162 clut = get_clut(ctx, clut_id);
1165 clut = av_malloc(sizeof(DVBSubCLUT));
1167 return AVERROR(ENOMEM);
1169 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1174 clut->next = ctx->clut_list;
1175 ctx->clut_list = clut;
1178 if (clut->version != version) {
1180 clut->version = version;
1182 while (buf + 4 < buf_end) {
1185 depth = (*buf) & 0xe0;
1188 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1191 full_range = (*buf++) & 1;
1200 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1201 cb = (buf[1] << 2) & 0xf0;
1202 alpha = (buf[1] << 6) & 0xc0;
1210 YUV_TO_RGB1_CCIR(cb, cr);
1211 YUV_TO_RGB2_CCIR(r, g, b, y);
1213 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1214 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1215 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1216 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1217 return AVERROR_INVALIDDATA;
1221 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1222 else if (depth & 0x40)
1223 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1224 else if (depth & 0x20)
1225 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1233 static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1234 const uint8_t *buf, int buf_size)
1236 DVBSubContext *ctx = avctx->priv_data;
1238 const uint8_t *buf_end = buf + buf_size;
1239 int region_id, object_id;
1240 int av_unused version;
1241 DVBSubRegion *region;
1242 DVBSubObject *object;
1243 DVBSubObjectDisplay *display;
1247 return AVERROR_INVALIDDATA;
1251 region = get_region(ctx, region_id);
1254 region = av_mallocz(sizeof(DVBSubRegion));
1256 return AVERROR(ENOMEM);
1258 region->id = region_id;
1259 region->version = -1;
1261 region->next = ctx->region_list;
1262 ctx->region_list = region;
1265 version = ((*buf)>>4) & 15;
1266 fill = ((*buf++) >> 3) & 1;
1268 region->width = AV_RB16(buf);
1270 region->height = AV_RB16(buf);
1273 if (region->width * region->height != region->buf_size) {
1274 av_free(region->pbuf);
1276 region->buf_size = region->width * region->height;
1278 region->pbuf = av_malloc(region->buf_size);
1279 if (!region->pbuf) {
1283 return AVERROR(ENOMEM);
1290 region->depth = 1 << (((*buf++) >> 2) & 7);
1291 if(region->depth<2 || region->depth>8){
1292 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1295 region->clut = *buf++;
1297 if (region->depth == 8) {
1298 region->bgcolor = *buf++;
1303 if (region->depth == 4)
1304 region->bgcolor = (((*buf++) >> 4) & 15);
1306 region->bgcolor = (((*buf++) >> 2) & 3);
1309 ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1312 memset(region->pbuf, region->bgcolor, region->buf_size);
1313 ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1316 delete_region_display_list(ctx, region);
1318 while (buf + 5 < buf_end) {
1319 object_id = AV_RB16(buf);
1322 object = get_object(ctx, object_id);
1325 object = av_mallocz(sizeof(DVBSubObject));
1327 return AVERROR(ENOMEM);
1329 object->id = object_id;
1330 object->next = ctx->object_list;
1331 ctx->object_list = object;
1334 object->type = (*buf) >> 6;
1336 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1338 return AVERROR(ENOMEM);
1340 display->object_id = object_id;
1341 display->region_id = region_id;
1343 display->x_pos = AV_RB16(buf) & 0xfff;
1345 display->y_pos = AV_RB16(buf) & 0xfff;
1348 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1349 display->fgcolor = *buf++;
1350 display->bgcolor = *buf++;
1353 display->region_list_next = region->display_list;
1354 region->display_list = display;
1356 display->object_list_next = object->display_list;
1357 object->display_list = display;
1363 static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1364 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1366 DVBSubContext *ctx = avctx->priv_data;
1367 DVBSubRegionDisplay *display;
1368 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1370 const uint8_t *buf_end = buf + buf_size;
1377 return AVERROR_INVALIDDATA;
1380 version = ((*buf)>>4) & 15;
1381 page_state = ((*buf++) >> 2) & 3;
1383 if (ctx->version == version) {
1387 ctx->time_out = timeout;
1388 ctx->version = version;
1390 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1392 if(ctx->compute_edt == 1)
1393 save_subtitle_set(avctx, sub, got_output);
1395 if (page_state == 1 || page_state == 2) {
1396 delete_regions(ctx);
1397 delete_objects(ctx);
1401 tmp_display_list = ctx->display_list;
1402 ctx->display_list = NULL;
1404 while (buf + 5 < buf_end) {
1408 display = tmp_display_list;
1409 tmp_ptr = &tmp_display_list;
1411 while (display && display->region_id != region_id) {
1412 tmp_ptr = &display->next;
1413 display = display->next;
1417 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1419 return AVERROR(ENOMEM);
1422 display->region_id = region_id;
1424 display->x_pos = AV_RB16(buf);
1426 display->y_pos = AV_RB16(buf);
1429 *tmp_ptr = display->next;
1431 display->next = ctx->display_list;
1432 ctx->display_list = display;
1434 ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1437 while (tmp_display_list) {
1438 display = tmp_display_list;
1440 tmp_display_list = display->next;
1450 static int save_display_set(DVBSubContext *ctx)
1452 DVBSubRegion *region;
1453 DVBSubRegionDisplay *display;
1455 uint32_t *clut_table;
1456 int x_pos, y_pos, width, height;
1457 int x, y, y_off, x_off;
1460 static int fileno_index = 0;
1467 for (display = ctx->display_list; display; display = display->next) {
1468 region = get_region(ctx, display->region_id);
1474 x_pos = display->x_pos;
1475 y_pos = display->y_pos;
1476 width = region->width;
1477 height = region->height;
1479 if (display->x_pos < x_pos) {
1480 width += (x_pos - display->x_pos);
1481 x_pos = display->x_pos;
1484 if (display->y_pos < y_pos) {
1485 height += (y_pos - display->y_pos);
1486 y_pos = display->y_pos;
1489 if (display->x_pos + region->width > x_pos + width) {
1490 width = display->x_pos + region->width - x_pos;
1493 if (display->y_pos + region->height > y_pos + height) {
1494 height = display->y_pos + region->height - y_pos;
1501 pbuf = av_malloc(width * height * 4);
1505 for (display = ctx->display_list; display; display = display->next) {
1506 region = get_region(ctx, display->region_id);
1511 x_off = display->x_pos - x_pos;
1512 y_off = display->y_pos - y_pos;
1514 clut = get_clut(ctx, region->clut);
1517 clut = &default_clut;
1519 switch (region->depth) {
1521 clut_table = clut->clut4;
1524 clut_table = clut->clut256;
1528 clut_table = clut->clut16;
1532 for (y = 0; y < region->height; y++) {
1533 for (x = 0; x < region->width; x++) {
1534 pbuf[((y + y_off) * width) + x_off + x] =
1535 clut_table[region->pbuf[y * region->width + x]];
1541 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1543 png_save2(filename, pbuf, width, height);
1553 static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1557 DVBSubContext *ctx = avctx->priv_data;
1558 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1559 int dds_version, info_byte;
1562 return AVERROR_INVALIDDATA;
1564 info_byte = bytestream_get_byte(&buf);
1565 dds_version = info_byte >> 4;
1566 if (display_def && display_def->version == dds_version)
1567 return 0; // already have this display definition version
1570 display_def = av_mallocz(sizeof(*display_def));
1572 return AVERROR(ENOMEM);
1573 ctx->display_definition = display_def;
1576 display_def->version = dds_version;
1579 display_def->width = bytestream_get_be16(&buf) + 1;
1580 display_def->height = bytestream_get_be16(&buf) + 1;
1581 if (!avctx->width || !avctx->height) {
1582 avctx->width = display_def->width;
1583 avctx->height = display_def->height;
1586 if (info_byte & 1<<3) { // display_window_flag
1588 return AVERROR_INVALIDDATA;
1590 display_def->x = bytestream_get_be16(&buf);
1591 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1592 display_def->y = bytestream_get_be16(&buf);
1593 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1599 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1600 int buf_size, AVSubtitle *sub,int *got_output)
1602 DVBSubContext *ctx = avctx->priv_data;
1604 if(ctx->compute_edt == 0)
1605 save_subtitle_set(avctx, sub, got_output);
1607 save_display_set(ctx);
1612 static int dvbsub_decode(AVCodecContext *avctx,
1613 void *data, int *data_size,
1616 const uint8_t *buf = avpkt->data;
1617 int buf_size = avpkt->size;
1618 DVBSubContext *ctx = avctx->priv_data;
1619 AVSubtitle *sub = data;
1620 const uint8_t *p, *p_end;
1626 int got_segment = 0;
1629 ff_dlog(avctx, "DVB sub packet:\n");
1631 for (i=0; i < buf_size; i++) {
1632 ff_dlog(avctx, "%02x ", buf[i]);
1634 ff_dlog(avctx, "\n");
1638 ff_dlog(avctx, "\n");
1640 if (buf_size <= 6 || *buf != 0x0f) {
1641 ff_dlog(avctx, "incomplete or broken packet");
1642 return AVERROR_INVALIDDATA;
1646 p_end = buf + buf_size;
1648 while (p_end - p >= 6 && *p == 0x0f) {
1650 segment_type = *p++;
1651 page_id = AV_RB16(p);
1653 segment_length = AV_RB16(p);
1656 if (avctx->debug & FF_DEBUG_STARTCODE) {
1657 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1660 if (p_end - p < segment_length) {
1661 ff_dlog(avctx, "incomplete or broken packet");
1666 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1667 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1669 switch (segment_type) {
1670 case DVBSUB_PAGE_SEGMENT:
1671 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1674 case DVBSUB_REGION_SEGMENT:
1675 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1678 case DVBSUB_CLUT_SEGMENT:
1679 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1680 if (ret < 0) goto end;
1683 case DVBSUB_OBJECT_SEGMENT:
1684 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1687 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1688 ret = dvbsub_parse_display_definition_segment(avctx, p,
1692 case DVBSUB_DISPLAY_SEGMENT:
1693 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1694 if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1695 // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1697 avctx->height = 576;
1702 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1703 segment_type, page_id, segment_length);
1710 p += segment_length;
1712 // Some streams do not send a display segment but if we have all the other
1713 // segments then we need no further data.
1714 if (got_segment == 15) {
1715 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1716 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1722 avsubtitle_free(sub);
1725 if(ctx->compute_edt == 1 )
1726 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1732 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1733 static const AVOption options[] = {
1734 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1735 {"compute_clut", "compute clut when not available(-1) or always(1) or never(0)", offsetof(DVBSubContext, compute_clut), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, DS},
1736 {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1739 static const AVClass dvbsubdec_class = {
1740 .class_name = "DVB Sub Decoder",
1741 .item_name = av_default_item_name,
1743 .version = LIBAVUTIL_VERSION_INT,
1746 AVCodec ff_dvbsub_decoder = {
1748 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1749 .type = AVMEDIA_TYPE_SUBTITLE,
1750 .id = AV_CODEC_ID_DVB_SUBTITLE,
1751 .priv_data_size = sizeof(DVBSubContext),
1752 .init = dvbsub_init_decoder,
1753 .close = dvbsub_close_decoder,
1754 .decode = dvbsub_decode,
1755 .priv_class = &dvbsubdec_class,