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 */
242 DVBSubRegion *region_list;
243 DVBSubCLUT *clut_list;
244 DVBSubObject *object_list;
246 DVBSubRegionDisplay *display_list;
247 DVBSubDisplayDefinition *display_definition;
251 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
253 DVBSubObject *ptr = ctx->object_list;
255 while (ptr && ptr->id != object_id) {
262 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
264 DVBSubCLUT *ptr = ctx->clut_list;
266 while (ptr && ptr->id != clut_id) {
273 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
275 DVBSubRegion *ptr = ctx->region_list;
277 while (ptr && ptr->id != region_id) {
284 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
286 DVBSubObject *object, *obj2, **obj2_ptr;
287 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
289 while (region->display_list) {
290 display = region->display_list;
292 object = get_object(ctx, display->object_id);
295 obj_disp_ptr = &object->display_list;
296 obj_disp = *obj_disp_ptr;
298 while (obj_disp && obj_disp != display) {
299 obj_disp_ptr = &obj_disp->object_list_next;
300 obj_disp = *obj_disp_ptr;
304 *obj_disp_ptr = obj_disp->object_list_next;
306 if (!object->display_list) {
307 obj2_ptr = &ctx->object_list;
310 while (obj2 != object) {
312 obj2_ptr = &obj2->next;
316 *obj2_ptr = obj2->next;
323 region->display_list = display->region_list_next;
330 static void delete_cluts(DVBSubContext *ctx)
332 while (ctx->clut_list) {
333 DVBSubCLUT *clut = ctx->clut_list;
335 ctx->clut_list = clut->next;
341 static void delete_objects(DVBSubContext *ctx)
343 while (ctx->object_list) {
344 DVBSubObject *object = ctx->object_list;
346 ctx->object_list = object->next;
352 static void delete_regions(DVBSubContext *ctx)
354 while (ctx->region_list) {
355 DVBSubRegion *region = ctx->region_list;
357 ctx->region_list = region->next;
359 delete_region_display_list(ctx, region);
361 av_freep(®ion->pbuf);
366 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
368 int i, r, g, b, a = 0;
369 DVBSubContext *ctx = avctx->priv_data;
371 if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
372 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
373 ctx->composition_id = -1;
374 ctx->ancillary_id = -1;
376 if (avctx->extradata_size > 5) {
377 av_log(avctx, AV_LOG_WARNING, "Decoding first DVB subtitles sub-stream\n");
380 ctx->composition_id = AV_RB16(avctx->extradata);
381 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
385 ctx->prev_start = AV_NOPTS_VALUE;
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(AVCodecContext *avctx,
474 uint8_t *destbuf, int dbuf_len,
475 const uint8_t **srcbuf, int buf_size,
476 int non_mod, uint8_t *map_table, int x_pos)
482 int pixels_read = x_pos;
484 init_get_bits(&gb, *srcbuf, buf_size << 3);
488 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
489 bits = get_bits(&gb, 2);
492 if (non_mod != 1 || bits != 1) {
494 *destbuf++ = map_table[bits];
500 bits = get_bits1(&gb);
502 run_length = get_bits(&gb, 3) + 3;
503 bits = get_bits(&gb, 2);
505 if (non_mod == 1 && bits == 1)
506 pixels_read += run_length;
509 bits = map_table[bits];
510 while (run_length-- > 0 && pixels_read < dbuf_len) {
516 bits = get_bits1(&gb);
518 bits = get_bits(&gb, 2);
520 run_length = get_bits(&gb, 4) + 12;
521 bits = get_bits(&gb, 2);
523 if (non_mod == 1 && bits == 1)
524 pixels_read += run_length;
527 bits = map_table[bits];
528 while (run_length-- > 0 && pixels_read < dbuf_len) {
533 } else if (bits == 3) {
534 run_length = get_bits(&gb, 8) + 29;
535 bits = get_bits(&gb, 2);
537 if (non_mod == 1 && bits == 1)
538 pixels_read += run_length;
541 bits = map_table[bits];
542 while (run_length-- > 0 && pixels_read < dbuf_len) {
547 } else if (bits == 1) {
553 while (run_length-- > 0 && pixels_read < dbuf_len) {
558 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
573 if (get_bits(&gb, 6))
574 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
576 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
581 static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
582 const uint8_t **srcbuf, int buf_size,
583 int non_mod, uint8_t *map_table, int x_pos)
589 int pixels_read = x_pos;
591 init_get_bits(&gb, *srcbuf, buf_size << 3);
595 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
596 bits = get_bits(&gb, 4);
599 if (non_mod != 1 || bits != 1) {
601 *destbuf++ = map_table[bits];
607 bits = get_bits1(&gb);
609 run_length = get_bits(&gb, 3);
611 if (run_length == 0) {
612 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
623 while (run_length-- > 0 && pixels_read < dbuf_len) {
628 bits = get_bits1(&gb);
630 run_length = get_bits(&gb, 2) + 4;
631 bits = get_bits(&gb, 4);
633 if (non_mod == 1 && bits == 1)
634 pixels_read += run_length;
637 bits = map_table[bits];
638 while (run_length-- > 0 && pixels_read < dbuf_len) {
644 bits = get_bits(&gb, 2);
646 run_length = get_bits(&gb, 4) + 9;
647 bits = get_bits(&gb, 4);
649 if (non_mod == 1 && bits == 1)
650 pixels_read += run_length;
653 bits = map_table[bits];
654 while (run_length-- > 0 && pixels_read < dbuf_len) {
659 } else if (bits == 3) {
660 run_length = get_bits(&gb, 8) + 25;
661 bits = get_bits(&gb, 4);
663 if (non_mod == 1 && bits == 1)
664 pixels_read += run_length;
667 bits = map_table[bits];
668 while (run_length-- > 0 && pixels_read < dbuf_len) {
673 } else if (bits == 1) {
679 while (run_length-- > 0 && pixels_read < dbuf_len) {
696 if (get_bits(&gb, 8))
697 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
699 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
704 static int dvbsub_read_8bit_string(AVCodecContext *avctx,
705 uint8_t *destbuf, int dbuf_len,
706 const uint8_t **srcbuf, int buf_size,
707 int non_mod, uint8_t *map_table, int x_pos)
709 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
712 int pixels_read = x_pos;
716 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
720 if (non_mod != 1 || bits != 1) {
722 *destbuf++ = map_table[bits];
729 run_length = bits & 0x7f;
730 if ((bits & 0x80) == 0) {
731 if (run_length == 0) {
739 if (non_mod == 1 && bits == 1)
740 pixels_read += run_length;
743 bits = map_table[bits];
744 while (run_length-- > 0 && pixels_read < dbuf_len) {
753 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
758 static void compute_default_clut(AVPicture *frame, int w, int h)
760 uint8_t list[256] = {0};
761 uint8_t list_inv[256];
762 int counttab[256] = {0};
765 #define V(x,y) frame->data[0][(x) + (y)*frame->linesize[0]]
766 for (y = 0; y<h; y++) {
767 for (x = 0; x<w; x++) {
769 int vl = x ? V(x-1,y) + 1 : 0;
770 int vr = x+1<w ? V(x+1,y) + 1 : 0;
771 int vt = y ? V(x,y-1) + 1 : 0;
772 int vb = y+1<h ? V(x,y+1) + 1 : 0;
773 counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
776 #define L(x,y) list[ frame->data[0][(x) + (y)*frame->linesize[0]] ]
778 for (i = 0; i<256; i++) {
779 int scoretab[256] = {0};
782 for (y = 0; y<h; y++) {
783 for (x = 0; x<w; x++) {
784 int v = frame->data[0][x + y*frame->linesize[0]];
786 int l_l = x ? L(x-1, y) : 1;
787 int l_r = x+1<w ? L(x+1, y) : 1;
788 int l_t = y ? L(x, y-1) : 1;
789 int l_b = y+1<h ? L(x, y+1) : 1;
793 scoretab[v] += l_l + l_r + l_t + l_b;
794 score = 1024LL*scoretab[v] / counttab[v];
795 if (score > bestscore) {
804 list_inv[ i ] = bestv;
808 for (i--; i>=0; i--) {
810 AV_WN32(frame->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
815 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
817 DVBSubContext *ctx = avctx->priv_data;
818 DVBSubRegionDisplay *display;
819 DVBSubDisplayDefinition *display_def = ctx->display_definition;
820 DVBSubRegion *region;
821 AVSubtitleRect *rect;
823 uint32_t *clut_table;
825 int offset_x=0, offset_y=0;
830 offset_x = display_def->x;
831 offset_y = display_def->y;
834 /* Not touching AVSubtitles again*/
836 avpriv_request_sample(ctx, "Different Version of Segment asked Twice\n");
837 return AVERROR_PATCHWELCOME;
839 for (display = ctx->display_list; display; display = display->next) {
840 region = get_region(ctx, display->region_id);
841 if (region && region->dirty)
845 if(ctx->compute_edt == 0) {
846 sub->end_display_time = ctx->time_out * 1000;
848 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
849 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
852 if (sub->num_rects > 0) {
854 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
856 ret = AVERROR(ENOMEM);
860 for(i=0; i<sub->num_rects; i++)
861 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
865 for (display = ctx->display_list; display; display = display->next) {
866 region = get_region(ctx, display->region_id);
874 rect = sub->rects[i];
875 rect->x = display->x_pos + offset_x;
876 rect->y = display->y_pos + offset_y;
877 rect->w = region->width;
878 rect->h = region->height;
879 rect->nb_colors = (1 << region->depth);
880 rect->type = SUBTITLE_BITMAP;
881 rect->pict.linesize[0] = region->width;
883 clut = get_clut(ctx, region->clut);
886 clut = &default_clut;
888 switch (region->depth) {
890 clut_table = clut->clut4;
893 clut_table = clut->clut256;
897 clut_table = clut->clut16;
901 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
902 if (!rect->pict.data[1]) {
903 ret = AVERROR(ENOMEM);
906 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
908 rect->pict.data[0] = av_malloc(region->buf_size);
909 if (!rect->pict.data[0]) {
910 ret = AVERROR(ENOMEM);
914 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
916 if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
917 compute_default_clut(&rect->pict, rect->w, rect->h);
926 for(i=0; i<sub->num_rects; i++) {
927 rect = sub->rects[i];
929 av_freep(&rect->pict.data[0]);
930 av_freep(&rect->pict.data[1]);
932 av_freep(&sub->rects[i]);
934 av_freep(&sub->rects);
940 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
941 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
943 DVBSubContext *ctx = avctx->priv_data;
945 DVBSubRegion *region = get_region(ctx, display->region_id);
946 const uint8_t *buf_end = buf + buf_size;
951 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
952 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
953 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
954 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
958 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
959 top_bottom ? "bottom" : "top");
961 for (i = 0; i < buf_size; i++) {
963 ff_dlog(avctx, "0x%8p: ", buf+i);
965 ff_dlog(avctx, "%02x ", buf[i]);
967 ff_dlog(avctx, "\n");
971 ff_dlog(avctx, "\n");
980 x_pos = display->x_pos;
981 y_pos = display->y_pos;
985 while (buf < buf_end) {
986 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
987 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
993 if (region->depth == 8)
995 else if (region->depth == 4)
1000 x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
1001 region->width, &buf, buf_end - buf,
1002 non_mod, map_table, x_pos);
1005 if (region->depth < 4) {
1006 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
1010 if (region->depth == 8)
1011 map_table = map4to8;
1015 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
1016 region->width, &buf, buf_end - buf,
1017 non_mod, map_table, x_pos);
1020 if (region->depth < 8) {
1021 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
1025 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
1026 region->width, &buf, buf_end - buf,
1027 non_mod, NULL, x_pos);
1031 map2to4[0] = (*buf) >> 4;
1032 map2to4[1] = (*buf++) & 0xf;
1033 map2to4[2] = (*buf) >> 4;
1034 map2to4[3] = (*buf++) & 0xf;
1037 for (i = 0; i < 4; i++)
1038 map2to8[i] = *buf++;
1041 for (i = 0; i < 16; i++)
1042 map4to8[i] = *buf++;
1046 x_pos = display->x_pos;
1050 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
1056 static int dvbsub_parse_object_segment(AVCodecContext *avctx,
1057 const uint8_t *buf, int buf_size)
1059 DVBSubContext *ctx = avctx->priv_data;
1061 const uint8_t *buf_end = buf + buf_size;
1063 DVBSubObject *object;
1064 DVBSubObjectDisplay *display;
1065 int top_field_len, bottom_field_len;
1067 int coding_method, non_modifying_color;
1069 object_id = AV_RB16(buf);
1072 object = get_object(ctx, object_id);
1075 return AVERROR_INVALIDDATA;
1077 coding_method = ((*buf) >> 2) & 3;
1078 non_modifying_color = ((*buf++) >> 1) & 1;
1080 if (coding_method == 0) {
1081 top_field_len = AV_RB16(buf);
1083 bottom_field_len = AV_RB16(buf);
1086 if (buf + top_field_len + bottom_field_len > buf_end) {
1087 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
1088 return AVERROR_INVALIDDATA;
1091 for (display = object->display_list; display; display = display->object_list_next) {
1092 const uint8_t *block = buf;
1093 int bfl = bottom_field_len;
1095 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1096 non_modifying_color);
1098 if (bottom_field_len > 0)
1099 block = buf + top_field_len;
1101 bfl = top_field_len;
1103 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1104 non_modifying_color);
1107 /* } else if (coding_method == 1) {*/
1110 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1116 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1117 const uint8_t *buf, int buf_size)
1119 DVBSubContext *ctx = avctx->priv_data;
1121 const uint8_t *buf_end = buf + buf_size;
1125 int entry_id, depth , full_range;
1126 int y, cr, cb, alpha;
1127 int r, g, b, r_add, g_add, b_add;
1129 ff_dlog(avctx, "DVB clut packet:\n");
1131 for (i=0; i < buf_size; i++) {
1132 ff_dlog(avctx, "%02x ", buf[i]);
1134 ff_dlog(avctx, "\n");
1138 ff_dlog(avctx, "\n");
1141 version = ((*buf)>>4)&15;
1144 clut = get_clut(ctx, clut_id);
1147 clut = av_malloc(sizeof(DVBSubCLUT));
1149 return AVERROR(ENOMEM);
1151 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1156 clut->next = ctx->clut_list;
1157 ctx->clut_list = clut;
1160 if (clut->version != version) {
1162 clut->version = version;
1164 while (buf + 4 < buf_end) {
1167 depth = (*buf) & 0xe0;
1170 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1171 return AVERROR_INVALIDDATA;
1174 full_range = (*buf++) & 1;
1183 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1184 cb = (buf[1] << 2) & 0xf0;
1185 alpha = (buf[1] << 6) & 0xc0;
1193 YUV_TO_RGB1_CCIR(cb, cr);
1194 YUV_TO_RGB2_CCIR(r, g, b, y);
1196 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1197 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1198 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1199 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1200 return AVERROR_INVALIDDATA;
1204 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1205 else if (depth & 0x40)
1206 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1207 else if (depth & 0x20)
1208 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1216 static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1217 const uint8_t *buf, int buf_size)
1219 DVBSubContext *ctx = avctx->priv_data;
1221 const uint8_t *buf_end = buf + buf_size;
1222 int region_id, object_id;
1223 int av_unused version;
1224 DVBSubRegion *region;
1225 DVBSubObject *object;
1226 DVBSubObjectDisplay *display;
1230 return AVERROR_INVALIDDATA;
1234 region = get_region(ctx, region_id);
1237 region = av_mallocz(sizeof(DVBSubRegion));
1239 return AVERROR(ENOMEM);
1241 region->id = region_id;
1242 region->version = -1;
1244 region->next = ctx->region_list;
1245 ctx->region_list = region;
1248 version = ((*buf)>>4) & 15;
1249 fill = ((*buf++) >> 3) & 1;
1251 region->width = AV_RB16(buf);
1253 region->height = AV_RB16(buf);
1256 if (region->width * region->height != region->buf_size) {
1257 av_free(region->pbuf);
1259 region->buf_size = region->width * region->height;
1261 region->pbuf = av_malloc(region->buf_size);
1262 if (!region->pbuf) {
1266 return AVERROR(ENOMEM);
1273 region->depth = 1 << (((*buf++) >> 2) & 7);
1274 if(region->depth<2 || region->depth>8){
1275 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1278 region->clut = *buf++;
1280 if (region->depth == 8) {
1281 region->bgcolor = *buf++;
1286 if (region->depth == 4)
1287 region->bgcolor = (((*buf++) >> 4) & 15);
1289 region->bgcolor = (((*buf++) >> 2) & 3);
1292 ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1295 memset(region->pbuf, region->bgcolor, region->buf_size);
1296 ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1299 delete_region_display_list(ctx, region);
1301 while (buf + 5 < buf_end) {
1302 object_id = AV_RB16(buf);
1305 object = get_object(ctx, object_id);
1308 object = av_mallocz(sizeof(DVBSubObject));
1310 return AVERROR(ENOMEM);
1312 object->id = object_id;
1313 object->next = ctx->object_list;
1314 ctx->object_list = object;
1317 object->type = (*buf) >> 6;
1319 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1321 return AVERROR(ENOMEM);
1323 display->object_id = object_id;
1324 display->region_id = region_id;
1326 display->x_pos = AV_RB16(buf) & 0xfff;
1328 display->y_pos = AV_RB16(buf) & 0xfff;
1331 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1332 display->fgcolor = *buf++;
1333 display->bgcolor = *buf++;
1336 display->region_list_next = region->display_list;
1337 region->display_list = display;
1339 display->object_list_next = object->display_list;
1340 object->display_list = display;
1346 static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1347 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1349 DVBSubContext *ctx = avctx->priv_data;
1350 DVBSubRegionDisplay *display;
1351 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1353 const uint8_t *buf_end = buf + buf_size;
1360 return AVERROR_INVALIDDATA;
1363 version = ((*buf)>>4) & 15;
1364 page_state = ((*buf++) >> 2) & 3;
1366 if (ctx->version == version) {
1370 ctx->time_out = timeout;
1371 ctx->version = version;
1373 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1375 if(ctx->compute_edt == 1)
1376 save_subtitle_set(avctx, sub, got_output);
1378 if (page_state == 1 || page_state == 2) {
1379 delete_regions(ctx);
1380 delete_objects(ctx);
1384 tmp_display_list = ctx->display_list;
1385 ctx->display_list = NULL;
1387 while (buf + 5 < buf_end) {
1391 display = tmp_display_list;
1392 tmp_ptr = &tmp_display_list;
1394 while (display && display->region_id != region_id) {
1395 tmp_ptr = &display->next;
1396 display = display->next;
1400 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1402 return AVERROR(ENOMEM);
1405 display->region_id = region_id;
1407 display->x_pos = AV_RB16(buf);
1409 display->y_pos = AV_RB16(buf);
1412 *tmp_ptr = display->next;
1414 display->next = ctx->display_list;
1415 ctx->display_list = display;
1417 ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1420 while (tmp_display_list) {
1421 display = tmp_display_list;
1423 tmp_display_list = display->next;
1433 static void save_display_set(DVBSubContext *ctx)
1435 DVBSubRegion *region;
1436 DVBSubRegionDisplay *display;
1438 uint32_t *clut_table;
1439 int x_pos, y_pos, width, height;
1440 int x, y, y_off, x_off;
1443 static int fileno_index = 0;
1450 for (display = ctx->display_list; display; display = display->next) {
1451 region = get_region(ctx, display->region_id);
1457 x_pos = display->x_pos;
1458 y_pos = display->y_pos;
1459 width = region->width;
1460 height = region->height;
1462 if (display->x_pos < x_pos) {
1463 width += (x_pos - display->x_pos);
1464 x_pos = display->x_pos;
1467 if (display->y_pos < y_pos) {
1468 height += (y_pos - display->y_pos);
1469 y_pos = display->y_pos;
1472 if (display->x_pos + region->width > x_pos + width) {
1473 width = display->x_pos + region->width - x_pos;
1476 if (display->y_pos + region->height > y_pos + height) {
1477 height = display->y_pos + region->height - y_pos;
1484 pbuf = av_malloc(width * height * 4);
1488 for (display = ctx->display_list; display; display = display->next) {
1489 region = get_region(ctx, display->region_id);
1494 x_off = display->x_pos - x_pos;
1495 y_off = display->y_pos - y_pos;
1497 clut = get_clut(ctx, region->clut);
1500 clut = &default_clut;
1502 switch (region->depth) {
1504 clut_table = clut->clut4;
1507 clut_table = clut->clut256;
1511 clut_table = clut->clut16;
1515 for (y = 0; y < region->height; y++) {
1516 for (x = 0; x < region->width; x++) {
1517 pbuf[((y + y_off) * width) + x_off + x] =
1518 clut_table[region->pbuf[y * region->width + x]];
1524 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1526 png_save2(filename, pbuf, width, height);
1535 static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1539 DVBSubContext *ctx = avctx->priv_data;
1540 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1541 int dds_version, info_byte;
1544 return AVERROR_INVALIDDATA;
1546 info_byte = bytestream_get_byte(&buf);
1547 dds_version = info_byte >> 4;
1548 if (display_def && display_def->version == dds_version)
1549 return 0; // already have this display definition version
1552 display_def = av_mallocz(sizeof(*display_def));
1554 return AVERROR(ENOMEM);
1555 ctx->display_definition = display_def;
1558 display_def->version = dds_version;
1561 display_def->width = bytestream_get_be16(&buf) + 1;
1562 display_def->height = bytestream_get_be16(&buf) + 1;
1563 if (!avctx->width || !avctx->height) {
1564 avctx->width = display_def->width;
1565 avctx->height = display_def->height;
1568 if (info_byte & 1<<3) { // display_window_flag
1570 return AVERROR_INVALIDDATA;
1572 display_def->x = bytestream_get_be16(&buf);
1573 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1574 display_def->y = bytestream_get_be16(&buf);
1575 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1581 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1582 int buf_size, AVSubtitle *sub,int *got_output)
1584 DVBSubContext *ctx = avctx->priv_data;
1586 if(ctx->compute_edt == 0)
1587 save_subtitle_set(avctx, sub, got_output);
1589 save_display_set(ctx);
1594 static int dvbsub_decode(AVCodecContext *avctx,
1595 void *data, int *data_size,
1598 const uint8_t *buf = avpkt->data;
1599 int buf_size = avpkt->size;
1600 DVBSubContext *ctx = avctx->priv_data;
1601 AVSubtitle *sub = data;
1602 const uint8_t *p, *p_end;
1608 int got_segment = 0;
1610 ff_dlog(avctx, "DVB sub packet:\n");
1612 for (i=0; i < buf_size; i++) {
1613 ff_dlog(avctx, "%02x ", buf[i]);
1615 ff_dlog(avctx, "\n");
1619 ff_dlog(avctx, "\n");
1621 if (buf_size <= 6 || *buf != 0x0f) {
1622 ff_dlog(avctx, "incomplete or broken packet");
1623 return AVERROR_INVALIDDATA;
1627 p_end = buf + buf_size;
1629 while (p_end - p >= 6 && *p == 0x0f) {
1631 segment_type = *p++;
1632 page_id = AV_RB16(p);
1634 segment_length = AV_RB16(p);
1637 if (avctx->debug & FF_DEBUG_STARTCODE) {
1638 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1641 if (p_end - p < segment_length) {
1642 ff_dlog(avctx, "incomplete or broken packet");
1647 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1648 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1650 switch (segment_type) {
1651 case DVBSUB_PAGE_SEGMENT:
1652 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1655 case DVBSUB_REGION_SEGMENT:
1656 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1659 case DVBSUB_CLUT_SEGMENT:
1660 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1661 if (ret < 0) goto end;
1664 case DVBSUB_OBJECT_SEGMENT:
1665 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1668 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1669 ret = dvbsub_parse_display_definition_segment(avctx, p,
1672 case DVBSUB_DISPLAY_SEGMENT:
1673 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1677 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1678 segment_type, page_id, segment_length);
1685 p += segment_length;
1687 // Some streams do not send a display segment but if we have all the other
1688 // segments then we need no further data.
1689 if (got_segment == 15) {
1690 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1691 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1697 avsubtitle_free(sub);
1700 if(ctx->compute_edt == 1 )
1701 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1707 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1708 static const AVOption options[] = {
1709 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DS},
1710 {"compute_clut", "compute clut when not available(-1) or always(1) or never(0)", offsetof(DVBSubContext, compute_clut), FF_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DS},
1713 static const AVClass dvbsubdec_class = {
1714 .class_name = "DVB Sub Decoder",
1715 .item_name = av_default_item_name,
1717 .version = LIBAVUTIL_VERSION_INT,
1720 AVCodec ff_dvbsub_decoder = {
1722 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1723 .type = AVMEDIA_TYPE_SUBTITLE,
1724 .id = AV_CODEC_ID_DVB_SUBTITLE,
1725 .priv_data_size = sizeof(DVBSubContext),
1726 .init = dvbsub_init_decoder,
1727 .close = dvbsub_close_decoder,
1728 .decode = dvbsub_decode,
1729 .priv_class = &dvbsubdec_class,