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/imgutils.h"
28 #include "libavutil/opt.h"
30 #define DVBSUB_PAGE_SEGMENT 0x10
31 #define DVBSUB_REGION_SEGMENT 0x11
32 #define DVBSUB_CLUT_SEGMENT 0x12
33 #define DVBSUB_OBJECT_SEGMENT 0x13
34 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
35 #define DVBSUB_DISPLAY_SEGMENT 0x80
37 #define cm (ff_crop_tab + MAX_NEG_CROP)
39 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
41 typedef struct DVBSubCLUT {
47 uint32_t clut256[256];
49 struct DVBSubCLUT *next;
52 static DVBSubCLUT default_clut;
54 typedef struct DVBSubObjectDisplay {
64 struct DVBSubObjectDisplay *region_list_next;
65 struct DVBSubObjectDisplay *object_list_next;
66 } DVBSubObjectDisplay;
68 typedef struct DVBSubObject {
74 DVBSubObjectDisplay *display_list;
76 struct DVBSubObject *next;
79 typedef struct DVBSubRegionDisplay {
85 struct DVBSubRegionDisplay *next;
86 } DVBSubRegionDisplay;
88 typedef struct DVBSubRegion {
103 DVBSubObjectDisplay *display_list;
105 struct DVBSubRegion *next;
108 typedef struct DVBSubDisplayDefinition {
115 } DVBSubDisplayDefinition;
117 typedef struct DVBSubContext {
124 int compute_edt; /**< if 1 end display time calculated using pts
125 if 0 (Default) calculated using time out */
129 DVBSubRegion *region_list;
130 DVBSubCLUT *clut_list;
131 DVBSubObject *object_list;
133 DVBSubRegionDisplay *display_list;
134 DVBSubDisplayDefinition *display_definition;
138 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
140 DVBSubObject *ptr = ctx->object_list;
142 while (ptr && ptr->id != object_id) {
149 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
151 DVBSubCLUT *ptr = ctx->clut_list;
153 while (ptr && ptr->id != clut_id) {
160 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
162 DVBSubRegion *ptr = ctx->region_list;
164 while (ptr && ptr->id != region_id) {
171 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
173 DVBSubObject *object, *obj2, **obj2_ptr;
174 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
176 while (region->display_list) {
177 display = region->display_list;
179 object = get_object(ctx, display->object_id);
182 obj_disp_ptr = &object->display_list;
183 obj_disp = *obj_disp_ptr;
185 while (obj_disp && obj_disp != display) {
186 obj_disp_ptr = &obj_disp->object_list_next;
187 obj_disp = *obj_disp_ptr;
191 *obj_disp_ptr = obj_disp->object_list_next;
193 if (!object->display_list) {
194 obj2_ptr = &ctx->object_list;
197 while (obj2 != object) {
199 obj2_ptr = &obj2->next;
203 *obj2_ptr = obj2->next;
210 region->display_list = display->region_list_next;
217 static void delete_cluts(DVBSubContext *ctx)
219 while (ctx->clut_list) {
220 DVBSubCLUT *clut = ctx->clut_list;
222 ctx->clut_list = clut->next;
228 static void delete_objects(DVBSubContext *ctx)
230 while (ctx->object_list) {
231 DVBSubObject *object = ctx->object_list;
233 ctx->object_list = object->next;
239 static void delete_regions(DVBSubContext *ctx)
241 while (ctx->region_list) {
242 DVBSubRegion *region = ctx->region_list;
244 ctx->region_list = region->next;
246 delete_region_display_list(ctx, region);
248 av_freep(®ion->pbuf);
253 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
255 int i, r, g, b, a = 0;
256 DVBSubContext *ctx = avctx->priv_data;
258 if (ctx->substream < 0) {
259 ctx->composition_id = -1;
260 ctx->ancillary_id = -1;
261 } else if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
262 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
263 ctx->composition_id = -1;
264 ctx->ancillary_id = -1;
266 if (avctx->extradata_size > 5*ctx->substream + 2) {
267 ctx->composition_id = AV_RB16(avctx->extradata + 5*ctx->substream);
268 ctx->ancillary_id = AV_RB16(avctx->extradata + 5*ctx->substream + 2);
270 av_log(avctx, AV_LOG_WARNING, "Selected DVB subtitles sub-stream %d is not available\n", ctx->substream);
271 ctx->composition_id = AV_RB16(avctx->extradata);
272 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
277 ctx->prev_start = AV_NOPTS_VALUE;
279 default_clut.id = -1;
280 default_clut.next = NULL;
282 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
283 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
284 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
285 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
287 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
288 for (i = 1; i < 16; i++) {
290 r = (i & 1) ? 255 : 0;
291 g = (i & 2) ? 255 : 0;
292 b = (i & 4) ? 255 : 0;
294 r = (i & 1) ? 127 : 0;
295 g = (i & 2) ? 127 : 0;
296 b = (i & 4) ? 127 : 0;
298 default_clut.clut16[i] = RGBA(r, g, b, 255);
301 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
302 for (i = 1; i < 256; i++) {
304 r = (i & 1) ? 255 : 0;
305 g = (i & 2) ? 255 : 0;
306 b = (i & 4) ? 255 : 0;
311 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
312 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
313 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
317 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
318 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
319 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
323 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
324 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
325 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
329 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
330 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
331 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
336 default_clut.clut256[i] = RGBA(r, g, b, a);
342 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
344 DVBSubContext *ctx = avctx->priv_data;
345 DVBSubRegionDisplay *display;
353 av_freep(&ctx->display_definition);
355 while (ctx->display_list) {
356 display = ctx->display_list;
357 ctx->display_list = display->next;
365 static int dvbsub_read_2bit_string(AVCodecContext *avctx,
366 uint8_t *destbuf, int dbuf_len,
367 const uint8_t **srcbuf, int buf_size,
368 int non_mod, uint8_t *map_table, int x_pos)
374 int pixels_read = x_pos;
376 init_get_bits(&gb, *srcbuf, buf_size << 3);
380 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
381 bits = get_bits(&gb, 2);
384 if (non_mod != 1 || bits != 1) {
386 *destbuf++ = map_table[bits];
392 bits = get_bits1(&gb);
394 run_length = get_bits(&gb, 3) + 3;
395 bits = get_bits(&gb, 2);
397 if (non_mod == 1 && bits == 1)
398 pixels_read += run_length;
401 bits = map_table[bits];
402 while (run_length-- > 0 && pixels_read < dbuf_len) {
408 bits = get_bits1(&gb);
410 bits = get_bits(&gb, 2);
412 run_length = get_bits(&gb, 4) + 12;
413 bits = get_bits(&gb, 2);
415 if (non_mod == 1 && bits == 1)
416 pixels_read += run_length;
419 bits = map_table[bits];
420 while (run_length-- > 0 && pixels_read < dbuf_len) {
425 } else if (bits == 3) {
426 run_length = get_bits(&gb, 8) + 29;
427 bits = get_bits(&gb, 2);
429 if (non_mod == 1 && bits == 1)
430 pixels_read += run_length;
433 bits = map_table[bits];
434 while (run_length-- > 0 && pixels_read < dbuf_len) {
439 } else if (bits == 1) {
445 while (run_length-- > 0 && pixels_read < dbuf_len) {
450 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
465 if (get_bits(&gb, 6))
466 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
468 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
473 static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
474 const uint8_t **srcbuf, int buf_size,
475 int non_mod, uint8_t *map_table, int x_pos)
481 int pixels_read = x_pos;
483 init_get_bits(&gb, *srcbuf, buf_size << 3);
487 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
488 bits = get_bits(&gb, 4);
491 if (non_mod != 1 || bits != 1) {
493 *destbuf++ = map_table[bits];
499 bits = get_bits1(&gb);
501 run_length = get_bits(&gb, 3);
503 if (run_length == 0) {
504 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
515 while (run_length-- > 0 && pixels_read < dbuf_len) {
520 bits = get_bits1(&gb);
522 run_length = get_bits(&gb, 2) + 4;
523 bits = get_bits(&gb, 4);
525 if (non_mod == 1 && bits == 1)
526 pixels_read += run_length;
529 bits = map_table[bits];
530 while (run_length-- > 0 && pixels_read < dbuf_len) {
536 bits = get_bits(&gb, 2);
538 run_length = get_bits(&gb, 4) + 9;
539 bits = get_bits(&gb, 4);
541 if (non_mod == 1 && bits == 1)
542 pixels_read += run_length;
545 bits = map_table[bits];
546 while (run_length-- > 0 && pixels_read < dbuf_len) {
551 } else if (bits == 3) {
552 run_length = get_bits(&gb, 8) + 25;
553 bits = get_bits(&gb, 4);
555 if (non_mod == 1 && bits == 1)
556 pixels_read += run_length;
559 bits = map_table[bits];
560 while (run_length-- > 0 && pixels_read < dbuf_len) {
565 } else if (bits == 1) {
571 while (run_length-- > 0 && pixels_read < dbuf_len) {
588 if (get_bits(&gb, 8))
589 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
591 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
596 static int dvbsub_read_8bit_string(AVCodecContext *avctx,
597 uint8_t *destbuf, int dbuf_len,
598 const uint8_t **srcbuf, int buf_size,
599 int non_mod, uint8_t *map_table, int x_pos)
601 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
604 int pixels_read = x_pos;
608 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
612 if (non_mod != 1 || bits != 1) {
614 *destbuf++ = map_table[bits];
621 run_length = bits & 0x7f;
622 if ((bits & 0x80) == 0) {
623 if (run_length == 0) {
631 if (non_mod == 1 && bits == 1)
632 pixels_read += run_length;
635 bits = map_table[bits];
636 while (run_length-- > 0 && pixels_read < dbuf_len) {
645 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
650 static void compute_default_clut(AVSubtitleRect *rect, int w, int h)
652 uint8_t list[256] = {0};
653 uint8_t list_inv[256];
654 int counttab[256] = {0};
656 ptrdiff_t stride = rect->linesize[0];
657 #define V(x,y) rect->data[0][(x) + (y)*stride]
658 for (y = 0; y<h; y++) {
659 for (x = 0; x<w; x++) {
661 int vl = x ? V(x-1,y) + 1 : 0;
662 int vr = x+1<w ? V(x+1,y) + 1 : 0;
663 int vt = y ? V(x,y-1) + 1 : 0;
664 int vb = y+1<h ? V(x,y+1) + 1 : 0;
665 counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
668 #define L(x,y) list[d[(x) + (y)*stride]]
670 for (i = 0; i<256; i++) {
671 int scoretab[256] = {0};
674 for (y = 0; y<h; y++) {
675 for (x = 0; x<w; x++) {
676 uint8_t *d = &rect->data[0][x + y*stride];
679 int l_l = x ? L(-1, 0) : 1;
680 int l_r = x+1<w ? L( 1, 0) : 1;
681 int l_t = y ? L( 0,-1) : 1;
682 int l_b = y+1<h ? L( 0, 1) : 1;
686 scoretab[v] += l_l + l_r + l_t + l_b;
687 score = 1024LL*scoretab[v] / counttab[v];
688 if (score > bestscore) {
697 list_inv[ i ] = bestv;
700 count = FFMAX(i - 1, 1);
701 for (i--; i>=0; i--) {
703 AV_WN32(rect->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
708 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
710 DVBSubContext *ctx = avctx->priv_data;
711 DVBSubRegionDisplay *display;
712 DVBSubDisplayDefinition *display_def = ctx->display_definition;
713 DVBSubRegion *region;
714 AVSubtitleRect *rect;
716 uint32_t *clut_table;
718 int offset_x=0, offset_y=0;
723 offset_x = display_def->x;
724 offset_y = display_def->y;
727 /* Not touching AVSubtitles again*/
729 avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
730 return AVERROR_PATCHWELCOME;
732 for (display = ctx->display_list; display; display = display->next) {
733 region = get_region(ctx, display->region_id);
734 if (region && region->dirty)
738 if(ctx->compute_edt == 0) {
739 sub->end_display_time = ctx->time_out * 1000;
741 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
742 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
745 if (sub->num_rects > 0) {
747 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
749 ret = AVERROR(ENOMEM);
753 for(i=0; i<sub->num_rects; i++)
754 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
758 for (display = ctx->display_list; display; display = display->next) {
759 region = get_region(ctx, display->region_id);
767 rect = sub->rects[i];
768 rect->x = display->x_pos + offset_x;
769 rect->y = display->y_pos + offset_y;
770 rect->w = region->width;
771 rect->h = region->height;
772 rect->nb_colors = (1 << region->depth);
773 rect->type = SUBTITLE_BITMAP;
774 rect->linesize[0] = region->width;
776 clut = get_clut(ctx, region->clut);
779 clut = &default_clut;
781 switch (region->depth) {
783 clut_table = clut->clut4;
786 clut_table = clut->clut256;
790 clut_table = clut->clut16;
794 rect->data[1] = av_mallocz(AVPALETTE_SIZE);
795 if (!rect->data[1]) {
796 ret = AVERROR(ENOMEM);
799 memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
801 rect->data[0] = av_malloc(region->buf_size);
802 if (!rect->data[0]) {
803 ret = AVERROR(ENOMEM);
807 memcpy(rect->data[0], region->pbuf, region->buf_size);
809 if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
810 compute_default_clut(rect, rect->w, rect->h);
813 FF_DISABLE_DEPRECATION_WARNINGS
816 for (j = 0; j < 4; j++) {
817 rect->pict.data[j] = rect->data[j];
818 rect->pict.linesize[j] = rect->linesize[j];
821 FF_ENABLE_DEPRECATION_WARNINGS
831 for(i=0; i<sub->num_rects; i++) {
832 rect = sub->rects[i];
834 av_freep(&rect->data[0]);
835 av_freep(&rect->data[1]);
837 av_freep(&sub->rects[i]);
839 av_freep(&sub->rects);
845 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
846 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
848 DVBSubContext *ctx = avctx->priv_data;
850 DVBSubRegion *region = get_region(ctx, display->region_id);
851 const uint8_t *buf_end = buf + buf_size;
856 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
857 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
858 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
859 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
863 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
864 top_bottom ? "bottom" : "top");
866 for (i = 0; i < buf_size; i++) {
868 ff_dlog(avctx, "0x%8p: ", buf+i);
870 ff_dlog(avctx, "%02x ", buf[i]);
872 ff_dlog(avctx, "\n");
876 ff_dlog(avctx, "\n");
885 x_pos = display->x_pos;
886 y_pos = display->y_pos;
890 while (buf < buf_end) {
891 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
892 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
898 if (region->depth == 8)
900 else if (region->depth == 4)
905 x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
906 region->width, &buf, buf_end - buf,
907 non_mod, map_table, x_pos);
910 if (region->depth < 4) {
911 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
915 if (region->depth == 8)
920 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
921 region->width, &buf, buf_end - buf,
922 non_mod, map_table, x_pos);
925 if (region->depth < 8) {
926 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
930 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
931 region->width, &buf, buf_end - buf,
932 non_mod, NULL, x_pos);
936 map2to4[0] = (*buf) >> 4;
937 map2to4[1] = (*buf++) & 0xf;
938 map2to4[2] = (*buf) >> 4;
939 map2to4[3] = (*buf++) & 0xf;
942 for (i = 0; i < 4; i++)
946 for (i = 0; i < 16; i++)
951 x_pos = display->x_pos;
955 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
961 static int dvbsub_parse_object_segment(AVCodecContext *avctx,
962 const uint8_t *buf, int buf_size)
964 DVBSubContext *ctx = avctx->priv_data;
966 const uint8_t *buf_end = buf + buf_size;
968 DVBSubObject *object;
969 DVBSubObjectDisplay *display;
970 int top_field_len, bottom_field_len;
972 int coding_method, non_modifying_color;
974 object_id = AV_RB16(buf);
977 object = get_object(ctx, object_id);
980 return AVERROR_INVALIDDATA;
982 coding_method = ((*buf) >> 2) & 3;
983 non_modifying_color = ((*buf++) >> 1) & 1;
985 if (coding_method == 0) {
986 top_field_len = AV_RB16(buf);
988 bottom_field_len = AV_RB16(buf);
991 if (buf + top_field_len + bottom_field_len > buf_end) {
992 av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
993 return AVERROR_INVALIDDATA;
996 for (display = object->display_list; display; display = display->object_list_next) {
997 const uint8_t *block = buf;
998 int bfl = bottom_field_len;
1000 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1001 non_modifying_color);
1003 if (bottom_field_len > 0)
1004 block = buf + top_field_len;
1006 bfl = top_field_len;
1008 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1009 non_modifying_color);
1012 /* } else if (coding_method == 1) {*/
1015 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1021 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1022 const uint8_t *buf, int buf_size)
1024 DVBSubContext *ctx = avctx->priv_data;
1026 const uint8_t *buf_end = buf + buf_size;
1030 int entry_id, depth , full_range;
1031 int y, cr, cb, alpha;
1032 int r, g, b, r_add, g_add, b_add;
1034 ff_dlog(avctx, "DVB clut packet:\n");
1036 for (i=0; i < buf_size; i++) {
1037 ff_dlog(avctx, "%02x ", buf[i]);
1039 ff_dlog(avctx, "\n");
1043 ff_dlog(avctx, "\n");
1046 version = ((*buf)>>4)&15;
1049 clut = get_clut(ctx, clut_id);
1052 clut = av_malloc(sizeof(DVBSubCLUT));
1054 return AVERROR(ENOMEM);
1056 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1061 clut->next = ctx->clut_list;
1062 ctx->clut_list = clut;
1065 if (clut->version != version) {
1067 clut->version = version;
1069 while (buf + 4 < buf_end) {
1072 depth = (*buf) & 0xe0;
1075 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1078 full_range = (*buf++) & 1;
1087 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1088 cb = (buf[1] << 2) & 0xf0;
1089 alpha = (buf[1] << 6) & 0xc0;
1097 YUV_TO_RGB1_CCIR(cb, cr);
1098 YUV_TO_RGB2_CCIR(r, g, b, y);
1100 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1101 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1102 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1103 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1104 return AVERROR_INVALIDDATA;
1107 if (depth & 0x80 && entry_id < 4)
1108 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1109 else if (depth & 0x40 && entry_id < 16)
1110 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1111 else if (depth & 0x20)
1112 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1120 static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1121 const uint8_t *buf, int buf_size)
1123 DVBSubContext *ctx = avctx->priv_data;
1125 const uint8_t *buf_end = buf + buf_size;
1126 int region_id, object_id;
1127 int av_unused version;
1128 DVBSubRegion *region;
1129 DVBSubObject *object;
1130 DVBSubObjectDisplay *display;
1135 return AVERROR_INVALIDDATA;
1139 region = get_region(ctx, region_id);
1142 region = av_mallocz(sizeof(DVBSubRegion));
1144 return AVERROR(ENOMEM);
1146 region->id = region_id;
1147 region->version = -1;
1149 region->next = ctx->region_list;
1150 ctx->region_list = region;
1153 version = ((*buf)>>4) & 15;
1154 fill = ((*buf++) >> 3) & 1;
1156 region->width = AV_RB16(buf);
1158 region->height = AV_RB16(buf);
1161 ret = av_image_check_size2(region->width, region->height, avctx->max_pixels, AV_PIX_FMT_PAL8, 0, avctx);
1162 if (ret >= 0 && region->width * region->height * 2 > 320 * 1024 * 8) {
1163 ret = AVERROR_INVALIDDATA;
1164 av_log(avctx, AV_LOG_ERROR, "Pixel buffer memory constraint violated\n");
1167 region->width= region->height= 0;
1171 if (region->width * region->height != region->buf_size) {
1172 av_free(region->pbuf);
1174 region->buf_size = region->width * region->height;
1176 region->pbuf = av_malloc(region->buf_size);
1177 if (!region->pbuf) {
1181 return AVERROR(ENOMEM);
1188 region->depth = 1 << (((*buf++) >> 2) & 7);
1189 if(region->depth<2 || region->depth>8){
1190 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1193 region->clut = *buf++;
1195 if (region->depth == 8) {
1196 region->bgcolor = *buf++;
1201 if (region->depth == 4)
1202 region->bgcolor = (((*buf++) >> 4) & 15);
1204 region->bgcolor = (((*buf++) >> 2) & 3);
1207 ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1210 memset(region->pbuf, region->bgcolor, region->buf_size);
1211 ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1214 delete_region_display_list(ctx, region);
1216 while (buf + 5 < buf_end) {
1217 object_id = AV_RB16(buf);
1220 object = get_object(ctx, object_id);
1223 object = av_mallocz(sizeof(DVBSubObject));
1225 return AVERROR(ENOMEM);
1227 object->id = object_id;
1228 object->next = ctx->object_list;
1229 ctx->object_list = object;
1232 object->type = (*buf) >> 6;
1234 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1236 return AVERROR(ENOMEM);
1238 display->object_id = object_id;
1239 display->region_id = region_id;
1241 display->x_pos = AV_RB16(buf) & 0xfff;
1243 display->y_pos = AV_RB16(buf) & 0xfff;
1246 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1247 display->fgcolor = *buf++;
1248 display->bgcolor = *buf++;
1251 display->region_list_next = region->display_list;
1252 region->display_list = display;
1254 display->object_list_next = object->display_list;
1255 object->display_list = display;
1261 static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1262 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1264 DVBSubContext *ctx = avctx->priv_data;
1265 DVBSubRegionDisplay *display;
1266 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1268 const uint8_t *buf_end = buf + buf_size;
1275 return AVERROR_INVALIDDATA;
1278 version = ((*buf)>>4) & 15;
1279 page_state = ((*buf++) >> 2) & 3;
1281 if (ctx->version == version) {
1285 ctx->time_out = timeout;
1286 ctx->version = version;
1288 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1290 if(ctx->compute_edt == 1)
1291 save_subtitle_set(avctx, sub, got_output);
1293 if (page_state == 1 || page_state == 2) {
1294 delete_regions(ctx);
1295 delete_objects(ctx);
1299 tmp_display_list = ctx->display_list;
1300 ctx->display_list = NULL;
1302 while (buf + 5 < buf_end) {
1306 display = ctx->display_list;
1307 while (display && display->region_id != region_id) {
1308 display = display->next;
1311 av_log(avctx, AV_LOG_ERROR, "duplicate region\n");
1315 display = tmp_display_list;
1316 tmp_ptr = &tmp_display_list;
1318 while (display && display->region_id != region_id) {
1319 tmp_ptr = &display->next;
1320 display = display->next;
1324 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1326 return AVERROR(ENOMEM);
1329 display->region_id = region_id;
1331 display->x_pos = AV_RB16(buf);
1333 display->y_pos = AV_RB16(buf);
1336 *tmp_ptr = display->next;
1338 display->next = ctx->display_list;
1339 ctx->display_list = display;
1341 ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1344 while (tmp_display_list) {
1345 display = tmp_display_list;
1347 tmp_display_list = display->next;
1357 static void png_save(DVBSubContext *ctx, const char *filename, uint32_t *bitmap, int w, int h)
1361 char fname[40], fname2[40];
1364 snprintf(fname, sizeof(fname), "%s.ppm", filename);
1366 f = fopen(fname, "w");
1375 for(y = 0; y < h; y++) {
1376 for(x = 0; x < w; x++) {
1377 v = bitmap[y * w + x];
1378 putc((v >> 16) & 0xff, f);
1379 putc((v >> 8) & 0xff, f);
1380 putc((v >> 0) & 0xff, f);
1386 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
1388 f = fopen(fname2, "w");
1397 for(y = 0; y < h; y++) {
1398 for(x = 0; x < w; x++) {
1399 v = bitmap[y * w + x];
1400 putc((v >> 24) & 0xff, f);
1405 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
1406 if (system(command) != 0) {
1407 av_log(ctx, AV_LOG_ERROR, "Error running pnmtopng\n");
1411 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
1412 if (system(command) != 0) {
1413 av_log(ctx, AV_LOG_ERROR, "Error removing %s and %s\n", fname, fname2);
1418 static int save_display_set(DVBSubContext *ctx)
1420 DVBSubRegion *region;
1421 DVBSubRegionDisplay *display;
1423 uint32_t *clut_table;
1424 int x_pos, y_pos, width, height;
1425 int x, y, y_off, x_off;
1428 static int fileno_index = 0;
1435 for (display = ctx->display_list; display; display = display->next) {
1436 region = get_region(ctx, display->region_id);
1442 x_pos = display->x_pos;
1443 y_pos = display->y_pos;
1444 width = region->width;
1445 height = region->height;
1447 if (display->x_pos < x_pos) {
1448 width += (x_pos - display->x_pos);
1449 x_pos = display->x_pos;
1452 if (display->y_pos < y_pos) {
1453 height += (y_pos - display->y_pos);
1454 y_pos = display->y_pos;
1457 if (display->x_pos + region->width > x_pos + width) {
1458 width = display->x_pos + region->width - x_pos;
1461 if (display->y_pos + region->height > y_pos + height) {
1462 height = display->y_pos + region->height - y_pos;
1469 pbuf = av_malloc(width * height * 4);
1473 for (display = ctx->display_list; display; display = display->next) {
1474 region = get_region(ctx, display->region_id);
1479 x_off = display->x_pos - x_pos;
1480 y_off = display->y_pos - y_pos;
1482 clut = get_clut(ctx, region->clut);
1485 clut = &default_clut;
1487 switch (region->depth) {
1489 clut_table = clut->clut4;
1492 clut_table = clut->clut256;
1496 clut_table = clut->clut16;
1500 for (y = 0; y < region->height; y++) {
1501 for (x = 0; x < region->width; x++) {
1502 pbuf[((y + y_off) * width) + x_off + x] =
1503 clut_table[region->pbuf[y * region->width + x]];
1509 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1511 png_save(ctx, filename, pbuf, width, height);
1521 static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1525 DVBSubContext *ctx = avctx->priv_data;
1526 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1527 int dds_version, info_byte;
1530 return AVERROR_INVALIDDATA;
1532 info_byte = bytestream_get_byte(&buf);
1533 dds_version = info_byte >> 4;
1534 if (display_def && display_def->version == dds_version)
1535 return 0; // already have this display definition version
1538 display_def = av_mallocz(sizeof(*display_def));
1540 return AVERROR(ENOMEM);
1541 ctx->display_definition = display_def;
1544 display_def->version = dds_version;
1547 display_def->width = bytestream_get_be16(&buf) + 1;
1548 display_def->height = bytestream_get_be16(&buf) + 1;
1549 if (!avctx->width || !avctx->height) {
1550 avctx->width = display_def->width;
1551 avctx->height = display_def->height;
1554 if (info_byte & 1<<3) { // display_window_flag
1556 return AVERROR_INVALIDDATA;
1558 display_def->x = bytestream_get_be16(&buf);
1559 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1560 display_def->y = bytestream_get_be16(&buf);
1561 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1567 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1568 int buf_size, AVSubtitle *sub,int *got_output)
1570 DVBSubContext *ctx = avctx->priv_data;
1572 if(ctx->compute_edt == 0)
1573 save_subtitle_set(avctx, sub, got_output);
1575 save_display_set(ctx);
1580 static int dvbsub_decode(AVCodecContext *avctx,
1581 void *data, int *data_size,
1584 const uint8_t *buf = avpkt->data;
1585 int buf_size = avpkt->size;
1586 DVBSubContext *ctx = avctx->priv_data;
1587 AVSubtitle *sub = data;
1588 const uint8_t *p, *p_end;
1594 int got_segment = 0;
1597 ff_dlog(avctx, "DVB sub packet:\n");
1599 for (i=0; i < buf_size; i++) {
1600 ff_dlog(avctx, "%02x ", buf[i]);
1602 ff_dlog(avctx, "\n");
1606 ff_dlog(avctx, "\n");
1608 if (buf_size <= 6 || *buf != 0x0f) {
1609 ff_dlog(avctx, "incomplete or broken packet");
1610 return AVERROR_INVALIDDATA;
1614 p_end = buf + buf_size;
1616 while (p_end - p >= 6 && *p == 0x0f) {
1618 segment_type = *p++;
1619 page_id = AV_RB16(p);
1621 segment_length = AV_RB16(p);
1624 if (avctx->debug & FF_DEBUG_STARTCODE) {
1625 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1628 if (p_end - p < segment_length) {
1629 ff_dlog(avctx, "incomplete or broken packet");
1634 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1635 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1637 switch (segment_type) {
1638 case DVBSUB_PAGE_SEGMENT:
1639 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1642 case DVBSUB_REGION_SEGMENT:
1643 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1646 case DVBSUB_CLUT_SEGMENT:
1647 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1648 if (ret < 0) goto end;
1651 case DVBSUB_OBJECT_SEGMENT:
1652 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1655 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1656 ret = dvbsub_parse_display_definition_segment(avctx, p,
1660 case DVBSUB_DISPLAY_SEGMENT:
1661 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1662 if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1663 // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1665 avctx->height = 576;
1670 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1671 segment_type, page_id, segment_length);
1678 p += segment_length;
1680 // Some streams do not send a display segment but if we have all the other
1681 // segments then we need no further data.
1682 if (got_segment == 15) {
1683 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1684 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1690 avsubtitle_free(sub);
1693 if(ctx->compute_edt == 1 )
1694 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1700 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1701 static const AVOption options[] = {
1702 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1703 {"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},
1704 {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1707 static const AVClass dvbsubdec_class = {
1708 .class_name = "DVB Sub Decoder",
1709 .item_name = av_default_item_name,
1711 .version = LIBAVUTIL_VERSION_INT,
1714 AVCodec ff_dvbsub_decoder = {
1716 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1717 .type = AVMEDIA_TYPE_SUBTITLE,
1718 .id = AV_CODEC_ID_DVB_SUBTITLE,
1719 .priv_data_size = sizeof(DVBSubContext),
1720 .init = dvbsub_init_decoder,
1721 .close = dvbsub_close_decoder,
1722 .decode = dvbsub_decode,
1723 .priv_class = &dvbsubdec_class,