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)
38 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
40 typedef struct DVBSubCLUT {
46 uint32_t clut256[256];
48 struct DVBSubCLUT *next;
51 static DVBSubCLUT default_clut;
53 typedef struct DVBSubObjectDisplay {
63 struct DVBSubObjectDisplay *region_list_next;
64 struct DVBSubObjectDisplay *object_list_next;
65 } DVBSubObjectDisplay;
67 typedef struct DVBSubObject {
73 DVBSubObjectDisplay *display_list;
75 struct DVBSubObject *next;
78 typedef struct DVBSubRegionDisplay {
84 struct DVBSubRegionDisplay *next;
85 } DVBSubRegionDisplay;
87 typedef struct DVBSubRegion {
102 DVBSubObjectDisplay *display_list;
104 struct DVBSubRegion *next;
107 typedef struct DVBSubDisplayDefinition {
114 } DVBSubDisplayDefinition;
116 typedef struct DVBSubContext {
123 int compute_edt; /**< if 1 end display time calculated using pts
124 if 0 (Default) calculated using time out */
128 DVBSubRegion *region_list;
129 DVBSubCLUT *clut_list;
130 DVBSubObject *object_list;
132 DVBSubRegionDisplay *display_list;
133 DVBSubDisplayDefinition *display_definition;
137 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
139 DVBSubObject *ptr = ctx->object_list;
141 while (ptr && ptr->id != object_id) {
148 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
150 DVBSubCLUT *ptr = ctx->clut_list;
152 while (ptr && ptr->id != clut_id) {
159 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
161 DVBSubRegion *ptr = ctx->region_list;
163 while (ptr && ptr->id != region_id) {
170 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
172 DVBSubObject *object, *obj2, **obj2_ptr;
173 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
175 while (region->display_list) {
176 display = region->display_list;
178 object = get_object(ctx, display->object_id);
181 obj_disp_ptr = &object->display_list;
182 obj_disp = *obj_disp_ptr;
184 while (obj_disp && obj_disp != display) {
185 obj_disp_ptr = &obj_disp->object_list_next;
186 obj_disp = *obj_disp_ptr;
190 *obj_disp_ptr = obj_disp->object_list_next;
192 if (!object->display_list) {
193 obj2_ptr = &ctx->object_list;
196 while (obj2 != object) {
198 obj2_ptr = &obj2->next;
202 *obj2_ptr = obj2->next;
209 region->display_list = display->region_list_next;
216 static void delete_cluts(DVBSubContext *ctx)
218 while (ctx->clut_list) {
219 DVBSubCLUT *clut = ctx->clut_list;
221 ctx->clut_list = clut->next;
227 static void delete_objects(DVBSubContext *ctx)
229 while (ctx->object_list) {
230 DVBSubObject *object = ctx->object_list;
232 ctx->object_list = object->next;
238 static void delete_regions(DVBSubContext *ctx)
240 while (ctx->region_list) {
241 DVBSubRegion *region = ctx->region_list;
243 ctx->region_list = region->next;
245 delete_region_display_list(ctx, region);
247 av_freep(®ion->pbuf);
252 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
254 int i, r, g, b, a = 0;
255 DVBSubContext *ctx = avctx->priv_data;
257 if (ctx->substream < 0) {
258 ctx->composition_id = -1;
259 ctx->ancillary_id = -1;
260 } else if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
261 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
262 ctx->composition_id = -1;
263 ctx->ancillary_id = -1;
265 if (avctx->extradata_size > 5*ctx->substream + 2) {
266 ctx->composition_id = AV_RB16(avctx->extradata + 5*ctx->substream);
267 ctx->ancillary_id = AV_RB16(avctx->extradata + 5*ctx->substream + 2);
269 av_log(avctx, AV_LOG_WARNING, "Selected DVB subtitles sub-stream %d is not available\n", ctx->substream);
270 ctx->composition_id = AV_RB16(avctx->extradata);
271 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
276 ctx->prev_start = AV_NOPTS_VALUE;
278 default_clut.id = -1;
279 default_clut.next = NULL;
281 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
282 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
283 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
284 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
286 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
287 for (i = 1; i < 16; i++) {
289 r = (i & 1) ? 255 : 0;
290 g = (i & 2) ? 255 : 0;
291 b = (i & 4) ? 255 : 0;
293 r = (i & 1) ? 127 : 0;
294 g = (i & 2) ? 127 : 0;
295 b = (i & 4) ? 127 : 0;
297 default_clut.clut16[i] = RGBA(r, g, b, 255);
300 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
301 for (i = 1; i < 256; i++) {
303 r = (i & 1) ? 255 : 0;
304 g = (i & 2) ? 255 : 0;
305 b = (i & 4) ? 255 : 0;
310 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
311 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
312 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
316 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
317 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
318 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
322 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
323 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
324 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
328 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
329 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
330 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
335 default_clut.clut256[i] = RGBA(r, g, b, a);
341 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
343 DVBSubContext *ctx = avctx->priv_data;
344 DVBSubRegionDisplay *display;
352 av_freep(&ctx->display_definition);
354 while (ctx->display_list) {
355 display = ctx->display_list;
356 ctx->display_list = display->next;
364 static int dvbsub_read_2bit_string(AVCodecContext *avctx,
365 uint8_t *destbuf, int dbuf_len,
366 const uint8_t **srcbuf, int buf_size,
367 int non_mod, uint8_t *map_table, int x_pos)
373 int pixels_read = x_pos;
375 init_get_bits(&gb, *srcbuf, buf_size << 3);
379 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
380 bits = get_bits(&gb, 2);
383 if (non_mod != 1 || bits != 1) {
385 *destbuf++ = map_table[bits];
391 bits = get_bits1(&gb);
393 run_length = get_bits(&gb, 3) + 3;
394 bits = get_bits(&gb, 2);
396 if (non_mod == 1 && bits == 1)
397 pixels_read += run_length;
400 bits = map_table[bits];
401 while (run_length-- > 0 && pixels_read < dbuf_len) {
407 bits = get_bits1(&gb);
409 bits = get_bits(&gb, 2);
411 run_length = get_bits(&gb, 4) + 12;
412 bits = get_bits(&gb, 2);
414 if (non_mod == 1 && bits == 1)
415 pixels_read += run_length;
418 bits = map_table[bits];
419 while (run_length-- > 0 && pixels_read < dbuf_len) {
424 } else if (bits == 3) {
425 run_length = get_bits(&gb, 8) + 29;
426 bits = get_bits(&gb, 2);
428 if (non_mod == 1 && bits == 1)
429 pixels_read += run_length;
432 bits = map_table[bits];
433 while (run_length-- > 0 && pixels_read < dbuf_len) {
438 } else if (bits == 1) {
444 while (run_length-- > 0 && pixels_read < dbuf_len) {
449 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
464 if (get_bits(&gb, 6))
465 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
467 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
472 static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
473 const uint8_t **srcbuf, int buf_size,
474 int non_mod, uint8_t *map_table, int x_pos)
480 int pixels_read = x_pos;
482 init_get_bits(&gb, *srcbuf, buf_size << 3);
486 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
487 bits = get_bits(&gb, 4);
490 if (non_mod != 1 || bits != 1) {
492 *destbuf++ = map_table[bits];
498 bits = get_bits1(&gb);
500 run_length = get_bits(&gb, 3);
502 if (run_length == 0) {
503 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
514 while (run_length-- > 0 && pixels_read < dbuf_len) {
519 bits = get_bits1(&gb);
521 run_length = get_bits(&gb, 2) + 4;
522 bits = get_bits(&gb, 4);
524 if (non_mod == 1 && bits == 1)
525 pixels_read += run_length;
528 bits = map_table[bits];
529 while (run_length-- > 0 && pixels_read < dbuf_len) {
535 bits = get_bits(&gb, 2);
537 run_length = get_bits(&gb, 4) + 9;
538 bits = get_bits(&gb, 4);
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 == 3) {
551 run_length = get_bits(&gb, 8) + 25;
552 bits = get_bits(&gb, 4);
554 if (non_mod == 1 && bits == 1)
555 pixels_read += run_length;
558 bits = map_table[bits];
559 while (run_length-- > 0 && pixels_read < dbuf_len) {
564 } else if (bits == 1) {
570 while (run_length-- > 0 && pixels_read < dbuf_len) {
587 if (get_bits(&gb, 8))
588 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
590 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
595 static int dvbsub_read_8bit_string(AVCodecContext *avctx,
596 uint8_t *destbuf, int dbuf_len,
597 const uint8_t **srcbuf, int buf_size,
598 int non_mod, uint8_t *map_table, int x_pos)
600 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
603 int pixels_read = x_pos;
607 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
611 if (non_mod != 1 || bits != 1) {
613 *destbuf++ = map_table[bits];
620 run_length = bits & 0x7f;
621 if ((bits & 0x80) == 0) {
622 if (run_length == 0) {
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) {
644 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
649 static void compute_default_clut(AVSubtitleRect *rect, int w, int h)
651 uint8_t list[256] = {0};
652 uint8_t list_inv[256];
653 int counttab[256] = {0};
656 #define V(x,y) rect->data[0][(x) + (y)*rect->linesize[0]]
657 for (y = 0; y<h; y++) {
658 for (x = 0; x<w; x++) {
660 int vl = x ? V(x-1,y) + 1 : 0;
661 int vr = x+1<w ? V(x+1,y) + 1 : 0;
662 int vt = y ? V(x,y-1) + 1 : 0;
663 int vb = y+1<h ? V(x,y+1) + 1 : 0;
664 counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
667 #define L(x,y) list[ rect->data[0][(x) + (y)*rect->linesize[0]] ]
669 for (i = 0; i<256; i++) {
670 int scoretab[256] = {0};
673 for (y = 0; y<h; y++) {
674 for (x = 0; x<w; x++) {
675 int v = rect->data[0][x + y*rect->linesize[0]];
677 int l_l = x ? L(x-1, y) : 1;
678 int l_r = x+1<w ? L(x+1, y) : 1;
679 int l_t = y ? L(x, y-1) : 1;
680 int l_b = y+1<h ? L(x, y+1) : 1;
684 scoretab[v] += l_l + l_r + l_t + l_b;
685 score = 1024LL*scoretab[v] / counttab[v];
686 if (score > bestscore) {
695 list_inv[ i ] = bestv;
698 count = FFMAX(i - 1, 1);
699 for (i--; i>=0; i--) {
701 AV_WN32(rect->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
706 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
708 DVBSubContext *ctx = avctx->priv_data;
709 DVBSubRegionDisplay *display;
710 DVBSubDisplayDefinition *display_def = ctx->display_definition;
711 DVBSubRegion *region;
712 AVSubtitleRect *rect;
714 uint32_t *clut_table;
716 int offset_x=0, offset_y=0;
721 offset_x = display_def->x;
722 offset_y = display_def->y;
725 /* Not touching AVSubtitles again*/
727 avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
728 return AVERROR_PATCHWELCOME;
730 for (display = ctx->display_list; display; display = display->next) {
731 region = get_region(ctx, display->region_id);
732 if (region && region->dirty)
736 if(ctx->compute_edt == 0) {
737 sub->end_display_time = ctx->time_out * 1000;
739 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
740 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
743 if (sub->num_rects > 0) {
745 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
747 ret = AVERROR(ENOMEM);
751 for(i=0; i<sub->num_rects; i++)
752 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
756 for (display = ctx->display_list; display; display = display->next) {
757 region = get_region(ctx, display->region_id);
765 rect = sub->rects[i];
766 rect->x = display->x_pos + offset_x;
767 rect->y = display->y_pos + offset_y;
768 rect->w = region->width;
769 rect->h = region->height;
770 rect->nb_colors = (1 << region->depth);
771 rect->type = SUBTITLE_BITMAP;
772 rect->linesize[0] = region->width;
774 clut = get_clut(ctx, region->clut);
777 clut = &default_clut;
779 switch (region->depth) {
781 clut_table = clut->clut4;
784 clut_table = clut->clut256;
788 clut_table = clut->clut16;
792 rect->data[1] = av_mallocz(AVPALETTE_SIZE);
793 if (!rect->data[1]) {
794 ret = AVERROR(ENOMEM);
797 memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
799 rect->data[0] = av_malloc(region->buf_size);
800 if (!rect->data[0]) {
801 ret = AVERROR(ENOMEM);
805 memcpy(rect->data[0], region->pbuf, region->buf_size);
807 if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
808 compute_default_clut(rect, rect->w, rect->h);
811 FF_DISABLE_DEPRECATION_WARNINGS
814 for (j = 0; j < 4; j++) {
815 rect->pict.data[j] = rect->data[j];
816 rect->pict.linesize[j] = rect->linesize[j];
819 FF_ENABLE_DEPRECATION_WARNINGS
829 for(i=0; i<sub->num_rects; i++) {
830 rect = sub->rects[i];
832 av_freep(&rect->data[0]);
833 av_freep(&rect->data[1]);
835 av_freep(&sub->rects[i]);
837 av_freep(&sub->rects);
843 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
844 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
846 DVBSubContext *ctx = avctx->priv_data;
848 DVBSubRegion *region = get_region(ctx, display->region_id);
849 const uint8_t *buf_end = buf + buf_size;
854 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
855 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
856 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
857 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
861 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
862 top_bottom ? "bottom" : "top");
864 for (i = 0; i < buf_size; i++) {
866 ff_dlog(avctx, "0x%8p: ", buf+i);
868 ff_dlog(avctx, "%02x ", buf[i]);
870 ff_dlog(avctx, "\n");
874 ff_dlog(avctx, "\n");
883 x_pos = display->x_pos;
884 y_pos = display->y_pos;
888 while (buf < buf_end) {
889 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
890 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
896 if (region->depth == 8)
898 else if (region->depth == 4)
903 x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
904 region->width, &buf, buf_end - buf,
905 non_mod, map_table, x_pos);
908 if (region->depth < 4) {
909 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
913 if (region->depth == 8)
918 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
919 region->width, &buf, buf_end - buf,
920 non_mod, map_table, x_pos);
923 if (region->depth < 8) {
924 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
928 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
929 region->width, &buf, buf_end - buf,
930 non_mod, NULL, x_pos);
934 map2to4[0] = (*buf) >> 4;
935 map2to4[1] = (*buf++) & 0xf;
936 map2to4[2] = (*buf) >> 4;
937 map2to4[3] = (*buf++) & 0xf;
940 for (i = 0; i < 4; i++)
944 for (i = 0; i < 16; i++)
949 x_pos = display->x_pos;
953 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
959 static int dvbsub_parse_object_segment(AVCodecContext *avctx,
960 const uint8_t *buf, int buf_size)
962 DVBSubContext *ctx = avctx->priv_data;
964 const uint8_t *buf_end = buf + buf_size;
966 DVBSubObject *object;
967 DVBSubObjectDisplay *display;
968 int top_field_len, bottom_field_len;
970 int coding_method, non_modifying_color;
972 object_id = AV_RB16(buf);
975 object = get_object(ctx, object_id);
978 return AVERROR_INVALIDDATA;
980 coding_method = ((*buf) >> 2) & 3;
981 non_modifying_color = ((*buf++) >> 1) & 1;
983 if (coding_method == 0) {
984 top_field_len = AV_RB16(buf);
986 bottom_field_len = AV_RB16(buf);
989 if (buf + top_field_len + bottom_field_len > buf_end) {
990 av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
991 return AVERROR_INVALIDDATA;
994 for (display = object->display_list; display; display = display->object_list_next) {
995 const uint8_t *block = buf;
996 int bfl = bottom_field_len;
998 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
999 non_modifying_color);
1001 if (bottom_field_len > 0)
1002 block = buf + top_field_len;
1004 bfl = top_field_len;
1006 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1007 non_modifying_color);
1010 /* } else if (coding_method == 1) {*/
1013 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1019 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1020 const uint8_t *buf, int buf_size)
1022 DVBSubContext *ctx = avctx->priv_data;
1024 const uint8_t *buf_end = buf + buf_size;
1028 int entry_id, depth , full_range;
1029 int y, cr, cb, alpha;
1030 int r, g, b, r_add, g_add, b_add;
1032 ff_dlog(avctx, "DVB clut packet:\n");
1034 for (i=0; i < buf_size; i++) {
1035 ff_dlog(avctx, "%02x ", buf[i]);
1037 ff_dlog(avctx, "\n");
1041 ff_dlog(avctx, "\n");
1044 version = ((*buf)>>4)&15;
1047 clut = get_clut(ctx, clut_id);
1050 clut = av_malloc(sizeof(DVBSubCLUT));
1052 return AVERROR(ENOMEM);
1054 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1059 clut->next = ctx->clut_list;
1060 ctx->clut_list = clut;
1063 if (clut->version != version) {
1065 clut->version = version;
1067 while (buf + 4 < buf_end) {
1070 depth = (*buf) & 0xe0;
1073 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1076 full_range = (*buf++) & 1;
1085 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1086 cb = (buf[1] << 2) & 0xf0;
1087 alpha = (buf[1] << 6) & 0xc0;
1095 YUV_TO_RGB1_CCIR(cb, cr);
1096 YUV_TO_RGB2_CCIR(r, g, b, y);
1098 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1099 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1100 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1101 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1102 return AVERROR_INVALIDDATA;
1106 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1107 else if (depth & 0x40)
1108 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1109 else if (depth & 0x20)
1110 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1118 static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1119 const uint8_t *buf, int buf_size)
1121 DVBSubContext *ctx = avctx->priv_data;
1123 const uint8_t *buf_end = buf + buf_size;
1124 int region_id, object_id;
1125 int av_unused version;
1126 DVBSubRegion *region;
1127 DVBSubObject *object;
1128 DVBSubObjectDisplay *display;
1132 return AVERROR_INVALIDDATA;
1136 region = get_region(ctx, region_id);
1139 region = av_mallocz(sizeof(DVBSubRegion));
1141 return AVERROR(ENOMEM);
1143 region->id = region_id;
1144 region->version = -1;
1146 region->next = ctx->region_list;
1147 ctx->region_list = region;
1150 version = ((*buf)>>4) & 15;
1151 fill = ((*buf++) >> 3) & 1;
1153 region->width = AV_RB16(buf);
1155 region->height = AV_RB16(buf);
1158 if (region->width * region->height != region->buf_size) {
1159 av_free(region->pbuf);
1161 region->buf_size = region->width * region->height;
1163 region->pbuf = av_malloc(region->buf_size);
1164 if (!region->pbuf) {
1168 return AVERROR(ENOMEM);
1175 region->depth = 1 << (((*buf++) >> 2) & 7);
1176 if(region->depth<2 || region->depth>8){
1177 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1180 region->clut = *buf++;
1182 if (region->depth == 8) {
1183 region->bgcolor = *buf++;
1188 if (region->depth == 4)
1189 region->bgcolor = (((*buf++) >> 4) & 15);
1191 region->bgcolor = (((*buf++) >> 2) & 3);
1194 ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1197 memset(region->pbuf, region->bgcolor, region->buf_size);
1198 ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1201 delete_region_display_list(ctx, region);
1203 while (buf + 5 < buf_end) {
1204 object_id = AV_RB16(buf);
1207 object = get_object(ctx, object_id);
1210 object = av_mallocz(sizeof(DVBSubObject));
1212 return AVERROR(ENOMEM);
1214 object->id = object_id;
1215 object->next = ctx->object_list;
1216 ctx->object_list = object;
1219 object->type = (*buf) >> 6;
1221 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1223 return AVERROR(ENOMEM);
1225 display->object_id = object_id;
1226 display->region_id = region_id;
1228 display->x_pos = AV_RB16(buf) & 0xfff;
1230 display->y_pos = AV_RB16(buf) & 0xfff;
1233 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1234 display->fgcolor = *buf++;
1235 display->bgcolor = *buf++;
1238 display->region_list_next = region->display_list;
1239 region->display_list = display;
1241 display->object_list_next = object->display_list;
1242 object->display_list = display;
1248 static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1249 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1251 DVBSubContext *ctx = avctx->priv_data;
1252 DVBSubRegionDisplay *display;
1253 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1255 const uint8_t *buf_end = buf + buf_size;
1262 return AVERROR_INVALIDDATA;
1265 version = ((*buf)>>4) & 15;
1266 page_state = ((*buf++) >> 2) & 3;
1268 if (ctx->version == version) {
1272 ctx->time_out = timeout;
1273 ctx->version = version;
1275 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1277 if(ctx->compute_edt == 1)
1278 save_subtitle_set(avctx, sub, got_output);
1280 if (page_state == 1 || page_state == 2) {
1281 delete_regions(ctx);
1282 delete_objects(ctx);
1286 tmp_display_list = ctx->display_list;
1287 ctx->display_list = NULL;
1289 while (buf + 5 < buf_end) {
1293 display = tmp_display_list;
1294 tmp_ptr = &tmp_display_list;
1296 while (display && display->region_id != region_id) {
1297 tmp_ptr = &display->next;
1298 display = display->next;
1302 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1304 return AVERROR(ENOMEM);
1307 display->region_id = region_id;
1309 display->x_pos = AV_RB16(buf);
1311 display->y_pos = AV_RB16(buf);
1314 *tmp_ptr = display->next;
1316 display->next = ctx->display_list;
1317 ctx->display_list = display;
1319 ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1322 while (tmp_display_list) {
1323 display = tmp_display_list;
1325 tmp_display_list = display->next;
1335 static void png_save(DVBSubContext *ctx, const char *filename, uint32_t *bitmap, int w, int h)
1339 char fname[40], fname2[40];
1342 snprintf(fname, sizeof(fname), "%s.ppm", filename);
1344 f = fopen(fname, "w");
1353 for(y = 0; y < h; y++) {
1354 for(x = 0; x < w; x++) {
1355 v = bitmap[y * w + x];
1356 putc((v >> 16) & 0xff, f);
1357 putc((v >> 8) & 0xff, f);
1358 putc((v >> 0) & 0xff, f);
1364 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
1366 f = fopen(fname2, "w");
1375 for(y = 0; y < h; y++) {
1376 for(x = 0; x < w; x++) {
1377 v = bitmap[y * w + x];
1378 putc((v >> 24) & 0xff, f);
1383 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
1384 if (system(command) != 0) {
1385 av_log(ctx, AV_LOG_ERROR, "Error running pnmtopng\n");
1389 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
1390 if (system(command) != 0) {
1391 av_log(ctx, AV_LOG_ERROR, "Error removing %s and %s\n", fname, fname2);
1396 static int save_display_set(DVBSubContext *ctx)
1398 DVBSubRegion *region;
1399 DVBSubRegionDisplay *display;
1401 uint32_t *clut_table;
1402 int x_pos, y_pos, width, height;
1403 int x, y, y_off, x_off;
1406 static int fileno_index = 0;
1413 for (display = ctx->display_list; display; display = display->next) {
1414 region = get_region(ctx, display->region_id);
1420 x_pos = display->x_pos;
1421 y_pos = display->y_pos;
1422 width = region->width;
1423 height = region->height;
1425 if (display->x_pos < x_pos) {
1426 width += (x_pos - display->x_pos);
1427 x_pos = display->x_pos;
1430 if (display->y_pos < y_pos) {
1431 height += (y_pos - display->y_pos);
1432 y_pos = display->y_pos;
1435 if (display->x_pos + region->width > x_pos + width) {
1436 width = display->x_pos + region->width - x_pos;
1439 if (display->y_pos + region->height > y_pos + height) {
1440 height = display->y_pos + region->height - y_pos;
1447 pbuf = av_malloc(width * height * 4);
1451 for (display = ctx->display_list; display; display = display->next) {
1452 region = get_region(ctx, display->region_id);
1457 x_off = display->x_pos - x_pos;
1458 y_off = display->y_pos - y_pos;
1460 clut = get_clut(ctx, region->clut);
1463 clut = &default_clut;
1465 switch (region->depth) {
1467 clut_table = clut->clut4;
1470 clut_table = clut->clut256;
1474 clut_table = clut->clut16;
1478 for (y = 0; y < region->height; y++) {
1479 for (x = 0; x < region->width; x++) {
1480 pbuf[((y + y_off) * width) + x_off + x] =
1481 clut_table[region->pbuf[y * region->width + x]];
1487 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1489 png_save(ctx, filename, pbuf, width, height);
1499 static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1503 DVBSubContext *ctx = avctx->priv_data;
1504 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1505 int dds_version, info_byte;
1508 return AVERROR_INVALIDDATA;
1510 info_byte = bytestream_get_byte(&buf);
1511 dds_version = info_byte >> 4;
1512 if (display_def && display_def->version == dds_version)
1513 return 0; // already have this display definition version
1516 display_def = av_mallocz(sizeof(*display_def));
1518 return AVERROR(ENOMEM);
1519 ctx->display_definition = display_def;
1522 display_def->version = dds_version;
1525 display_def->width = bytestream_get_be16(&buf) + 1;
1526 display_def->height = bytestream_get_be16(&buf) + 1;
1527 if (!avctx->width || !avctx->height) {
1528 avctx->width = display_def->width;
1529 avctx->height = display_def->height;
1532 if (info_byte & 1<<3) { // display_window_flag
1534 return AVERROR_INVALIDDATA;
1536 display_def->x = bytestream_get_be16(&buf);
1537 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1538 display_def->y = bytestream_get_be16(&buf);
1539 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1545 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1546 int buf_size, AVSubtitle *sub,int *got_output)
1548 DVBSubContext *ctx = avctx->priv_data;
1550 if(ctx->compute_edt == 0)
1551 save_subtitle_set(avctx, sub, got_output);
1553 save_display_set(ctx);
1558 static int dvbsub_decode(AVCodecContext *avctx,
1559 void *data, int *data_size,
1562 const uint8_t *buf = avpkt->data;
1563 int buf_size = avpkt->size;
1564 DVBSubContext *ctx = avctx->priv_data;
1565 AVSubtitle *sub = data;
1566 const uint8_t *p, *p_end;
1572 int got_segment = 0;
1575 ff_dlog(avctx, "DVB sub packet:\n");
1577 for (i=0; i < buf_size; i++) {
1578 ff_dlog(avctx, "%02x ", buf[i]);
1580 ff_dlog(avctx, "\n");
1584 ff_dlog(avctx, "\n");
1586 if (buf_size <= 6 || *buf != 0x0f) {
1587 ff_dlog(avctx, "incomplete or broken packet");
1588 return AVERROR_INVALIDDATA;
1592 p_end = buf + buf_size;
1594 while (p_end - p >= 6 && *p == 0x0f) {
1596 segment_type = *p++;
1597 page_id = AV_RB16(p);
1599 segment_length = AV_RB16(p);
1602 if (avctx->debug & FF_DEBUG_STARTCODE) {
1603 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1606 if (p_end - p < segment_length) {
1607 ff_dlog(avctx, "incomplete or broken packet");
1612 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1613 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1615 switch (segment_type) {
1616 case DVBSUB_PAGE_SEGMENT:
1617 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1620 case DVBSUB_REGION_SEGMENT:
1621 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1624 case DVBSUB_CLUT_SEGMENT:
1625 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1626 if (ret < 0) goto end;
1629 case DVBSUB_OBJECT_SEGMENT:
1630 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1633 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1634 ret = dvbsub_parse_display_definition_segment(avctx, p,
1638 case DVBSUB_DISPLAY_SEGMENT:
1639 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1640 if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1641 // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1643 avctx->height = 576;
1648 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1649 segment_type, page_id, segment_length);
1656 p += segment_length;
1658 // Some streams do not send a display segment but if we have all the other
1659 // segments then we need no further data.
1660 if (got_segment == 15) {
1661 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1662 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1668 avsubtitle_free(sub);
1671 if(ctx->compute_edt == 1 )
1672 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1678 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1679 static const AVOption options[] = {
1680 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1681 {"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},
1682 {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1685 static const AVClass dvbsubdec_class = {
1686 .class_name = "DVB Sub Decoder",
1687 .item_name = av_default_item_name,
1689 .version = LIBAVUTIL_VERSION_INT,
1692 AVCodec ff_dvbsub_decoder = {
1694 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1695 .type = AVMEDIA_TYPE_SUBTITLE,
1696 .id = AV_CODEC_ID_DVB_SUBTITLE,
1697 .priv_data_size = sizeof(DVBSubContext),
1698 .init = dvbsub_init_decoder,
1699 .close = dvbsub_close_decoder,
1700 .decode = dvbsub_decode,
1701 .priv_class = &dvbsubdec_class,