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;
685 scoretab[v] += l_l + l_r + l_t + l_b;
688 for (x = 0; x < 256; x++) {
690 int score = 1024LL*scoretab[x] / counttab[x];
691 if (score > bestscore) {
700 list_inv[ i ] = bestv;
703 count = FFMAX(i - 1, 1);
704 for (i--; i>=0; i--) {
706 AV_WN32(rect->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
711 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
713 DVBSubContext *ctx = avctx->priv_data;
714 DVBSubRegionDisplay *display;
715 DVBSubDisplayDefinition *display_def = ctx->display_definition;
716 DVBSubRegion *region;
717 AVSubtitleRect *rect;
719 uint32_t *clut_table;
721 int offset_x=0, offset_y=0;
726 offset_x = display_def->x;
727 offset_y = display_def->y;
730 /* Not touching AVSubtitles again*/
732 avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
733 return AVERROR_PATCHWELCOME;
735 for (display = ctx->display_list; display; display = display->next) {
736 region = get_region(ctx, display->region_id);
737 if (region && region->dirty)
741 if(ctx->compute_edt == 0) {
742 sub->end_display_time = ctx->time_out * 1000;
744 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
745 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
748 if (sub->num_rects > 0) {
750 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
752 ret = AVERROR(ENOMEM);
756 for (i = 0; i < sub->num_rects; i++) {
757 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
758 if (!sub->rects[i]) {
759 ret = AVERROR(ENOMEM);
766 for (display = ctx->display_list; display; display = display->next) {
767 region = get_region(ctx, display->region_id);
775 rect = sub->rects[i];
776 rect->x = display->x_pos + offset_x;
777 rect->y = display->y_pos + offset_y;
778 rect->w = region->width;
779 rect->h = region->height;
780 rect->nb_colors = (1 << region->depth);
781 rect->type = SUBTITLE_BITMAP;
782 rect->linesize[0] = region->width;
784 clut = get_clut(ctx, region->clut);
787 clut = &default_clut;
789 switch (region->depth) {
791 clut_table = clut->clut4;
794 clut_table = clut->clut256;
798 clut_table = clut->clut16;
802 rect->data[1] = av_mallocz(AVPALETTE_SIZE);
803 if (!rect->data[1]) {
804 ret = AVERROR(ENOMEM);
807 memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
809 rect->data[0] = av_malloc(region->buf_size);
810 if (!rect->data[0]) {
811 ret = AVERROR(ENOMEM);
815 memcpy(rect->data[0], region->pbuf, region->buf_size);
817 if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
818 compute_default_clut(rect, rect->w, rect->h);
821 FF_DISABLE_DEPRECATION_WARNINGS
824 for (j = 0; j < 4; j++) {
825 rect->pict.data[j] = rect->data[j];
826 rect->pict.linesize[j] = rect->linesize[j];
829 FF_ENABLE_DEPRECATION_WARNINGS
839 for(i=0; i<sub->num_rects; i++) {
840 rect = sub->rects[i];
842 av_freep(&rect->data[0]);
843 av_freep(&rect->data[1]);
845 av_freep(&sub->rects[i]);
847 av_freep(&sub->rects);
853 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
854 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
856 DVBSubContext *ctx = avctx->priv_data;
858 DVBSubRegion *region = get_region(ctx, display->region_id);
859 const uint8_t *buf_end = buf + buf_size;
864 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
865 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
866 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
867 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
871 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
872 top_bottom ? "bottom" : "top");
874 for (i = 0; i < buf_size; i++) {
876 ff_dlog(avctx, "0x%8p: ", buf+i);
878 ff_dlog(avctx, "%02x ", buf[i]);
880 ff_dlog(avctx, "\n");
884 ff_dlog(avctx, "\n");
893 x_pos = display->x_pos;
894 y_pos = display->y_pos;
898 while (buf < buf_end) {
899 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
900 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
906 if (region->depth == 8)
908 else if (region->depth == 4)
913 x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
914 region->width, &buf, buf_end - buf,
915 non_mod, map_table, x_pos);
918 if (region->depth < 4) {
919 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
923 if (region->depth == 8)
928 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
929 region->width, &buf, buf_end - buf,
930 non_mod, map_table, x_pos);
933 if (region->depth < 8) {
934 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
938 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
939 region->width, &buf, buf_end - buf,
940 non_mod, NULL, x_pos);
944 map2to4[0] = (*buf) >> 4;
945 map2to4[1] = (*buf++) & 0xf;
946 map2to4[2] = (*buf) >> 4;
947 map2to4[3] = (*buf++) & 0xf;
950 for (i = 0; i < 4; i++)
954 for (i = 0; i < 16; i++)
959 x_pos = display->x_pos;
963 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
969 static int dvbsub_parse_object_segment(AVCodecContext *avctx,
970 const uint8_t *buf, int buf_size)
972 DVBSubContext *ctx = avctx->priv_data;
974 const uint8_t *buf_end = buf + buf_size;
976 DVBSubObject *object;
977 DVBSubObjectDisplay *display;
978 int top_field_len, bottom_field_len;
980 int coding_method, non_modifying_color;
982 object_id = AV_RB16(buf);
985 object = get_object(ctx, object_id);
988 return AVERROR_INVALIDDATA;
990 coding_method = ((*buf) >> 2) & 3;
991 non_modifying_color = ((*buf++) >> 1) & 1;
993 if (coding_method == 0) {
994 top_field_len = AV_RB16(buf);
996 bottom_field_len = AV_RB16(buf);
999 if (buf + top_field_len + bottom_field_len > buf_end) {
1000 av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1001 return AVERROR_INVALIDDATA;
1004 for (display = object->display_list; display; display = display->object_list_next) {
1005 const uint8_t *block = buf;
1006 int bfl = bottom_field_len;
1008 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1009 non_modifying_color);
1011 if (bottom_field_len > 0)
1012 block = buf + top_field_len;
1014 bfl = top_field_len;
1016 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1017 non_modifying_color);
1020 /* } else if (coding_method == 1) {*/
1023 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1029 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1030 const uint8_t *buf, int buf_size)
1032 DVBSubContext *ctx = avctx->priv_data;
1034 const uint8_t *buf_end = buf + buf_size;
1038 int entry_id, depth , full_range;
1039 int y, cr, cb, alpha;
1040 int r, g, b, r_add, g_add, b_add;
1042 ff_dlog(avctx, "DVB clut packet:\n");
1044 for (i=0; i < buf_size; i++) {
1045 ff_dlog(avctx, "%02x ", buf[i]);
1047 ff_dlog(avctx, "\n");
1051 ff_dlog(avctx, "\n");
1054 version = ((*buf)>>4)&15;
1057 clut = get_clut(ctx, clut_id);
1060 clut = av_malloc(sizeof(DVBSubCLUT));
1062 return AVERROR(ENOMEM);
1064 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1069 clut->next = ctx->clut_list;
1070 ctx->clut_list = clut;
1073 if (clut->version != version) {
1075 clut->version = version;
1077 while (buf + 4 < buf_end) {
1080 depth = (*buf) & 0xe0;
1083 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1086 full_range = (*buf++) & 1;
1095 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1096 cb = (buf[1] << 2) & 0xf0;
1097 alpha = (buf[1] << 6) & 0xc0;
1105 YUV_TO_RGB1_CCIR(cb, cr);
1106 YUV_TO_RGB2_CCIR(r, g, b, y);
1108 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1109 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1110 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1111 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1112 return AVERROR_INVALIDDATA;
1115 if (depth & 0x80 && entry_id < 4)
1116 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1117 else if (depth & 0x40 && entry_id < 16)
1118 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1119 else if (depth & 0x20)
1120 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1128 static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1129 const uint8_t *buf, int buf_size)
1131 DVBSubContext *ctx = avctx->priv_data;
1133 const uint8_t *buf_end = buf + buf_size;
1134 int region_id, object_id;
1135 int av_unused version;
1136 DVBSubRegion *region;
1137 DVBSubObject *object;
1138 DVBSubObjectDisplay *display;
1143 return AVERROR_INVALIDDATA;
1147 region = get_region(ctx, region_id);
1150 region = av_mallocz(sizeof(DVBSubRegion));
1152 return AVERROR(ENOMEM);
1154 region->id = region_id;
1155 region->version = -1;
1157 region->next = ctx->region_list;
1158 ctx->region_list = region;
1161 version = ((*buf)>>4) & 15;
1162 fill = ((*buf++) >> 3) & 1;
1164 region->width = AV_RB16(buf);
1166 region->height = AV_RB16(buf);
1169 ret = av_image_check_size2(region->width, region->height, avctx->max_pixels, AV_PIX_FMT_PAL8, 0, avctx);
1170 if (ret >= 0 && region->width * region->height * 2 > 320 * 1024 * 8) {
1171 ret = AVERROR_INVALIDDATA;
1172 av_log(avctx, AV_LOG_ERROR, "Pixel buffer memory constraint violated\n");
1175 region->width= region->height= 0;
1179 if (region->width * region->height != region->buf_size) {
1180 av_free(region->pbuf);
1182 region->buf_size = region->width * region->height;
1184 region->pbuf = av_malloc(region->buf_size);
1185 if (!region->pbuf) {
1189 return AVERROR(ENOMEM);
1196 region->depth = 1 << (((*buf++) >> 2) & 7);
1197 if(region->depth<2 || region->depth>8){
1198 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1201 region->clut = *buf++;
1203 if (region->depth == 8) {
1204 region->bgcolor = *buf++;
1209 if (region->depth == 4)
1210 region->bgcolor = (((*buf++) >> 4) & 15);
1212 region->bgcolor = (((*buf++) >> 2) & 3);
1215 ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1218 memset(region->pbuf, region->bgcolor, region->buf_size);
1219 ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1222 delete_region_display_list(ctx, region);
1224 while (buf + 5 < buf_end) {
1225 object_id = AV_RB16(buf);
1228 object = get_object(ctx, object_id);
1231 object = av_mallocz(sizeof(DVBSubObject));
1233 return AVERROR(ENOMEM);
1235 object->id = object_id;
1236 object->next = ctx->object_list;
1237 ctx->object_list = object;
1240 object->type = (*buf) >> 6;
1242 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1244 return AVERROR(ENOMEM);
1246 display->object_id = object_id;
1247 display->region_id = region_id;
1249 display->x_pos = AV_RB16(buf) & 0xfff;
1251 display->y_pos = AV_RB16(buf) & 0xfff;
1254 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1255 display->fgcolor = *buf++;
1256 display->bgcolor = *buf++;
1259 display->region_list_next = region->display_list;
1260 region->display_list = display;
1262 display->object_list_next = object->display_list;
1263 object->display_list = display;
1269 static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1270 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1272 DVBSubContext *ctx = avctx->priv_data;
1273 DVBSubRegionDisplay *display;
1274 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1276 const uint8_t *buf_end = buf + buf_size;
1283 return AVERROR_INVALIDDATA;
1286 version = ((*buf)>>4) & 15;
1287 page_state = ((*buf++) >> 2) & 3;
1289 if (ctx->version == version) {
1293 ctx->time_out = timeout;
1294 ctx->version = version;
1296 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1298 if(ctx->compute_edt == 1)
1299 save_subtitle_set(avctx, sub, got_output);
1301 if (page_state == 1 || page_state == 2) {
1302 delete_regions(ctx);
1303 delete_objects(ctx);
1307 tmp_display_list = ctx->display_list;
1308 ctx->display_list = NULL;
1310 while (buf + 5 < buf_end) {
1314 display = ctx->display_list;
1315 while (display && display->region_id != region_id) {
1316 display = display->next;
1319 av_log(avctx, AV_LOG_ERROR, "duplicate region\n");
1323 display = tmp_display_list;
1324 tmp_ptr = &tmp_display_list;
1326 while (display && display->region_id != region_id) {
1327 tmp_ptr = &display->next;
1328 display = display->next;
1332 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1334 return AVERROR(ENOMEM);
1337 display->region_id = region_id;
1339 display->x_pos = AV_RB16(buf);
1341 display->y_pos = AV_RB16(buf);
1344 *tmp_ptr = display->next;
1346 display->next = ctx->display_list;
1347 ctx->display_list = display;
1349 ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1352 while (tmp_display_list) {
1353 display = tmp_display_list;
1355 tmp_display_list = display->next;
1365 static void png_save(DVBSubContext *ctx, const char *filename, uint32_t *bitmap, int w, int h)
1369 char fname[40], fname2[40];
1372 snprintf(fname, sizeof(fname), "%s.ppm", filename);
1374 f = fopen(fname, "w");
1383 for(y = 0; y < h; y++) {
1384 for(x = 0; x < w; x++) {
1385 v = bitmap[y * w + x];
1386 putc((v >> 16) & 0xff, f);
1387 putc((v >> 8) & 0xff, f);
1388 putc((v >> 0) & 0xff, f);
1394 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
1396 f = fopen(fname2, "w");
1405 for(y = 0; y < h; y++) {
1406 for(x = 0; x < w; x++) {
1407 v = bitmap[y * w + x];
1408 putc((v >> 24) & 0xff, f);
1413 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
1414 if (system(command) != 0) {
1415 av_log(ctx, AV_LOG_ERROR, "Error running pnmtopng\n");
1419 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
1420 if (system(command) != 0) {
1421 av_log(ctx, AV_LOG_ERROR, "Error removing %s and %s\n", fname, fname2);
1426 static int save_display_set(DVBSubContext *ctx)
1428 DVBSubRegion *region;
1429 DVBSubRegionDisplay *display;
1431 uint32_t *clut_table;
1432 int x_pos, y_pos, width, height;
1433 int x, y, y_off, x_off;
1436 static int fileno_index = 0;
1443 for (display = ctx->display_list; display; display = display->next) {
1444 region = get_region(ctx, display->region_id);
1450 x_pos = display->x_pos;
1451 y_pos = display->y_pos;
1452 width = region->width;
1453 height = region->height;
1455 if (display->x_pos < x_pos) {
1456 width += (x_pos - display->x_pos);
1457 x_pos = display->x_pos;
1460 if (display->y_pos < y_pos) {
1461 height += (y_pos - display->y_pos);
1462 y_pos = display->y_pos;
1465 if (display->x_pos + region->width > x_pos + width) {
1466 width = display->x_pos + region->width - x_pos;
1469 if (display->y_pos + region->height > y_pos + height) {
1470 height = display->y_pos + region->height - y_pos;
1477 pbuf = av_malloc(width * height * 4);
1481 for (display = ctx->display_list; display; display = display->next) {
1482 region = get_region(ctx, display->region_id);
1487 x_off = display->x_pos - x_pos;
1488 y_off = display->y_pos - y_pos;
1490 clut = get_clut(ctx, region->clut);
1493 clut = &default_clut;
1495 switch (region->depth) {
1497 clut_table = clut->clut4;
1500 clut_table = clut->clut256;
1504 clut_table = clut->clut16;
1508 for (y = 0; y < region->height; y++) {
1509 for (x = 0; x < region->width; x++) {
1510 pbuf[((y + y_off) * width) + x_off + x] =
1511 clut_table[region->pbuf[y * region->width + x]];
1517 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1519 png_save(ctx, filename, pbuf, width, height);
1529 static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1533 DVBSubContext *ctx = avctx->priv_data;
1534 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1535 int dds_version, info_byte;
1538 return AVERROR_INVALIDDATA;
1540 info_byte = bytestream_get_byte(&buf);
1541 dds_version = info_byte >> 4;
1542 if (display_def && display_def->version == dds_version)
1543 return 0; // already have this display definition version
1546 display_def = av_mallocz(sizeof(*display_def));
1548 return AVERROR(ENOMEM);
1549 ctx->display_definition = display_def;
1552 display_def->version = dds_version;
1555 display_def->width = bytestream_get_be16(&buf) + 1;
1556 display_def->height = bytestream_get_be16(&buf) + 1;
1557 if (!avctx->width || !avctx->height) {
1558 avctx->width = display_def->width;
1559 avctx->height = display_def->height;
1562 if (info_byte & 1<<3) { // display_window_flag
1564 return AVERROR_INVALIDDATA;
1566 display_def->x = bytestream_get_be16(&buf);
1567 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1568 display_def->y = bytestream_get_be16(&buf);
1569 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1575 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1576 int buf_size, AVSubtitle *sub,int *got_output)
1578 DVBSubContext *ctx = avctx->priv_data;
1580 if(ctx->compute_edt == 0)
1581 save_subtitle_set(avctx, sub, got_output);
1583 save_display_set(ctx);
1588 static int dvbsub_decode(AVCodecContext *avctx,
1589 void *data, int *data_size,
1592 const uint8_t *buf = avpkt->data;
1593 int buf_size = avpkt->size;
1594 DVBSubContext *ctx = avctx->priv_data;
1595 AVSubtitle *sub = data;
1596 const uint8_t *p, *p_end;
1602 int got_segment = 0;
1605 ff_dlog(avctx, "DVB sub packet:\n");
1607 for (i=0; i < buf_size; i++) {
1608 ff_dlog(avctx, "%02x ", buf[i]);
1610 ff_dlog(avctx, "\n");
1614 ff_dlog(avctx, "\n");
1616 if (buf_size <= 6 || *buf != 0x0f) {
1617 ff_dlog(avctx, "incomplete or broken packet");
1618 return AVERROR_INVALIDDATA;
1622 p_end = buf + buf_size;
1624 while (p_end - p >= 6 && *p == 0x0f) {
1626 segment_type = *p++;
1627 page_id = AV_RB16(p);
1629 segment_length = AV_RB16(p);
1632 if (avctx->debug & FF_DEBUG_STARTCODE) {
1633 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1636 if (p_end - p < segment_length) {
1637 ff_dlog(avctx, "incomplete or broken packet");
1642 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1643 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1645 switch (segment_type) {
1646 case DVBSUB_PAGE_SEGMENT:
1647 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1650 case DVBSUB_REGION_SEGMENT:
1651 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1654 case DVBSUB_CLUT_SEGMENT:
1655 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1656 if (ret < 0) goto end;
1659 case DVBSUB_OBJECT_SEGMENT:
1660 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1663 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1664 ret = dvbsub_parse_display_definition_segment(avctx, p,
1668 case DVBSUB_DISPLAY_SEGMENT:
1669 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1670 if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1671 // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1673 avctx->height = 576;
1678 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1679 segment_type, page_id, segment_length);
1686 p += segment_length;
1688 // Some streams do not send a display segment but if we have all the other
1689 // segments then we need no further data.
1690 if (got_segment == 15) {
1691 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1692 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1698 avsubtitle_free(sub);
1701 if(ctx->compute_edt == 1 )
1702 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1708 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1709 static const AVOption options[] = {
1710 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1711 {"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},
1712 {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1715 static const AVClass dvbsubdec_class = {
1716 .class_name = "DVB Sub Decoder",
1717 .item_name = av_default_item_name,
1719 .version = LIBAVUTIL_VERSION_INT,
1722 AVCodec ff_dvbsub_decoder = {
1724 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1725 .type = AVMEDIA_TYPE_SUBTITLE,
1726 .id = AV_CODEC_ID_DVB_SUBTITLE,
1727 .priv_data_size = sizeof(DVBSubContext),
1728 .init = dvbsub_init_decoder,
1729 .close = dvbsub_close_decoder,
1730 .decode = dvbsub_decode,
1731 .priv_class = &dvbsubdec_class,