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 {
99 uint8_t computed_clut[4*256];
100 int has_computed_clut;
106 DVBSubObjectDisplay *display_list;
108 struct DVBSubRegion *next;
111 typedef struct DVBSubDisplayDefinition {
118 } DVBSubDisplayDefinition;
120 typedef struct DVBSubContext {
127 int compute_edt; /**< if 1 end display time calculated using pts
128 if 0 (Default) calculated using time out */
130 int clut_count2[257][256];
133 DVBSubRegion *region_list;
134 DVBSubCLUT *clut_list;
135 DVBSubObject *object_list;
137 DVBSubRegionDisplay *display_list;
138 DVBSubDisplayDefinition *display_definition;
142 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
144 DVBSubObject *ptr = ctx->object_list;
146 while (ptr && ptr->id != object_id) {
153 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
155 DVBSubCLUT *ptr = ctx->clut_list;
157 while (ptr && ptr->id != clut_id) {
164 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
166 DVBSubRegion *ptr = ctx->region_list;
168 while (ptr && ptr->id != region_id) {
175 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
177 DVBSubObject *object, *obj2, **obj2_ptr;
178 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
180 while (region->display_list) {
181 display = region->display_list;
183 object = get_object(ctx, display->object_id);
186 obj_disp_ptr = &object->display_list;
187 obj_disp = *obj_disp_ptr;
189 while (obj_disp && obj_disp != display) {
190 obj_disp_ptr = &obj_disp->object_list_next;
191 obj_disp = *obj_disp_ptr;
195 *obj_disp_ptr = obj_disp->object_list_next;
197 if (!object->display_list) {
198 obj2_ptr = &ctx->object_list;
201 while (obj2 != object) {
203 obj2_ptr = &obj2->next;
207 *obj2_ptr = obj2->next;
214 region->display_list = display->region_list_next;
221 static void delete_cluts(DVBSubContext *ctx)
223 while (ctx->clut_list) {
224 DVBSubCLUT *clut = ctx->clut_list;
226 ctx->clut_list = clut->next;
232 static void delete_objects(DVBSubContext *ctx)
234 while (ctx->object_list) {
235 DVBSubObject *object = ctx->object_list;
237 ctx->object_list = object->next;
243 static void delete_regions(DVBSubContext *ctx)
245 while (ctx->region_list) {
246 DVBSubRegion *region = ctx->region_list;
248 ctx->region_list = region->next;
250 delete_region_display_list(ctx, region);
252 av_freep(®ion->pbuf);
257 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
259 int i, r, g, b, a = 0;
260 DVBSubContext *ctx = avctx->priv_data;
262 if (ctx->substream < 0) {
263 ctx->composition_id = -1;
264 ctx->ancillary_id = -1;
265 } else if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
266 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
267 ctx->composition_id = -1;
268 ctx->ancillary_id = -1;
270 if (avctx->extradata_size > 5*ctx->substream + 2) {
271 ctx->composition_id = AV_RB16(avctx->extradata + 5*ctx->substream);
272 ctx->ancillary_id = AV_RB16(avctx->extradata + 5*ctx->substream + 2);
274 av_log(avctx, AV_LOG_WARNING, "Selected DVB subtitles sub-stream %d is not available\n", ctx->substream);
275 ctx->composition_id = AV_RB16(avctx->extradata);
276 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
281 ctx->prev_start = AV_NOPTS_VALUE;
283 default_clut.id = -1;
284 default_clut.next = NULL;
286 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
287 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
288 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
289 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
291 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
292 for (i = 1; i < 16; i++) {
294 r = (i & 1) ? 255 : 0;
295 g = (i & 2) ? 255 : 0;
296 b = (i & 4) ? 255 : 0;
298 r = (i & 1) ? 127 : 0;
299 g = (i & 2) ? 127 : 0;
300 b = (i & 4) ? 127 : 0;
302 default_clut.clut16[i] = RGBA(r, g, b, 255);
305 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
306 for (i = 1; i < 256; i++) {
308 r = (i & 1) ? 255 : 0;
309 g = (i & 2) ? 255 : 0;
310 b = (i & 4) ? 255 : 0;
315 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
316 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
317 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
321 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
322 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
323 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
327 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
328 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
329 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
333 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
334 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
335 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
340 default_clut.clut256[i] = RGBA(r, g, b, a);
346 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
348 DVBSubContext *ctx = avctx->priv_data;
349 DVBSubRegionDisplay *display;
357 av_freep(&ctx->display_definition);
359 while (ctx->display_list) {
360 display = ctx->display_list;
361 ctx->display_list = display->next;
369 static int dvbsub_read_2bit_string(AVCodecContext *avctx,
370 uint8_t *destbuf, int dbuf_len,
371 const uint8_t **srcbuf, int buf_size,
372 int non_mod, uint8_t *map_table, int x_pos)
378 int pixels_read = x_pos;
380 init_get_bits(&gb, *srcbuf, buf_size << 3);
384 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
385 bits = get_bits(&gb, 2);
388 if (non_mod != 1 || bits != 1) {
390 *destbuf++ = map_table[bits];
396 bits = get_bits1(&gb);
398 run_length = get_bits(&gb, 3) + 3;
399 bits = get_bits(&gb, 2);
401 if (non_mod == 1 && bits == 1)
402 pixels_read += run_length;
405 bits = map_table[bits];
406 while (run_length-- > 0 && pixels_read < dbuf_len) {
412 bits = get_bits1(&gb);
414 bits = get_bits(&gb, 2);
416 run_length = get_bits(&gb, 4) + 12;
417 bits = get_bits(&gb, 2);
419 if (non_mod == 1 && bits == 1)
420 pixels_read += run_length;
423 bits = map_table[bits];
424 while (run_length-- > 0 && pixels_read < dbuf_len) {
429 } else if (bits == 3) {
430 run_length = get_bits(&gb, 8) + 29;
431 bits = get_bits(&gb, 2);
433 if (non_mod == 1 && bits == 1)
434 pixels_read += run_length;
437 bits = map_table[bits];
438 while (run_length-- > 0 && pixels_read < dbuf_len) {
443 } else if (bits == 1) {
449 while (run_length-- > 0 && pixels_read < dbuf_len) {
454 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
469 if (get_bits(&gb, 6))
470 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
472 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
477 static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
478 const uint8_t **srcbuf, int buf_size,
479 int non_mod, uint8_t *map_table, int x_pos)
485 int pixels_read = x_pos;
487 init_get_bits(&gb, *srcbuf, buf_size << 3);
491 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
492 bits = get_bits(&gb, 4);
495 if (non_mod != 1 || bits != 1) {
497 *destbuf++ = map_table[bits];
503 bits = get_bits1(&gb);
505 run_length = get_bits(&gb, 3);
507 if (run_length == 0) {
508 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
519 while (run_length-- > 0 && pixels_read < dbuf_len) {
524 bits = get_bits1(&gb);
526 run_length = get_bits(&gb, 2) + 4;
527 bits = get_bits(&gb, 4);
529 if (non_mod == 1 && bits == 1)
530 pixels_read += run_length;
533 bits = map_table[bits];
534 while (run_length-- > 0 && pixels_read < dbuf_len) {
540 bits = get_bits(&gb, 2);
542 run_length = get_bits(&gb, 4) + 9;
543 bits = get_bits(&gb, 4);
545 if (non_mod == 1 && bits == 1)
546 pixels_read += run_length;
549 bits = map_table[bits];
550 while (run_length-- > 0 && pixels_read < dbuf_len) {
555 } else if (bits == 3) {
556 run_length = get_bits(&gb, 8) + 25;
557 bits = get_bits(&gb, 4);
559 if (non_mod == 1 && bits == 1)
560 pixels_read += run_length;
563 bits = map_table[bits];
564 while (run_length-- > 0 && pixels_read < dbuf_len) {
569 } else if (bits == 1) {
575 while (run_length-- > 0 && pixels_read < dbuf_len) {
592 if (get_bits(&gb, 8))
593 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
595 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
600 static int dvbsub_read_8bit_string(AVCodecContext *avctx,
601 uint8_t *destbuf, int dbuf_len,
602 const uint8_t **srcbuf, int buf_size,
603 int non_mod, uint8_t *map_table, int x_pos)
605 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
608 int pixels_read = x_pos;
612 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
616 if (non_mod != 1 || bits != 1) {
618 *destbuf++ = map_table[bits];
625 run_length = bits & 0x7f;
626 if ((bits & 0x80) == 0) {
627 if (run_length == 0) {
635 if (non_mod == 1 && bits == 1)
636 pixels_read += run_length;
639 bits = map_table[bits];
640 while (run_length-- > 0 && pixels_read < dbuf_len) {
649 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
654 static void compute_default_clut(DVBSubContext *ctx, uint8_t *clut, AVSubtitleRect *rect, int w, int h)
656 uint8_t list[256] = {0};
657 uint8_t list_inv[256];
658 int counttab[256] = {0};
659 int (*counttab2)[256] = ctx->clut_count2;
661 ptrdiff_t stride = rect->linesize[0];
663 memset(ctx->clut_count2, 0 , sizeof(ctx->clut_count2));
665 #define V(x,y) rect->data[0][(x) + (y)*stride]
666 for (y = 0; y<h; y++) {
667 for (x = 0; x<w; x++) {
669 int vl = x ? V(x-1,y) + 1 : 0;
670 int vr = x+1<w ? V(x+1,y) + 1 : 0;
671 int vt = y ? V(x,y-1) + 1 : 0;
672 int vb = y+1<h ? V(x,y+1) + 1 : 0;
673 counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
674 counttab2[vl][v-1] ++;
675 counttab2[vr][v-1] ++;
676 counttab2[vt][v-1] ++;
677 counttab2[vb][v-1] ++;
680 #define L(x,y) list[d[(x) + (y)*stride]]
682 for (i = 0; i<256; i++) {
683 counttab2[i+1][i] = 0;
685 for (i = 0; i<256; i++) {
689 for (x = 0; x < 256; x++) {
693 scorev += counttab2[0][x];
694 for (y = 0; y < 256; y++) {
695 scorev += list[y] * counttab2[y+1][x];
699 int score = 1024LL*scorev / counttab[x];
700 if (score > bestscore) {
709 list_inv[ i ] = bestv;
712 count = FFMAX(i - 1, 1);
713 for (i--; i >= 0; i--) {
714 int v = i * 255 / count;
715 AV_WN32(clut + 4*list_inv[i], RGBA(v/2,v,v/2,v));
720 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
722 DVBSubContext *ctx = avctx->priv_data;
723 DVBSubRegionDisplay *display;
724 DVBSubDisplayDefinition *display_def = ctx->display_definition;
725 DVBSubRegion *region;
726 AVSubtitleRect *rect;
728 uint32_t *clut_table;
730 int offset_x=0, offset_y=0;
735 offset_x = display_def->x;
736 offset_y = display_def->y;
739 /* Not touching AVSubtitles again*/
740 if (sub->num_rects) {
741 avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
742 return AVERROR_PATCHWELCOME;
744 for (display = ctx->display_list; display; display = display->next) {
745 region = get_region(ctx, display->region_id);
746 if (region && region->dirty)
750 if (ctx->compute_edt == 0) {
751 sub->end_display_time = ctx->time_out * 1000;
753 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
754 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
757 if (sub->num_rects > 0) {
759 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
761 ret = AVERROR(ENOMEM);
765 for (i = 0; i < sub->num_rects; i++) {
766 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
767 if (!sub->rects[i]) {
768 ret = AVERROR(ENOMEM);
775 for (display = ctx->display_list; display; display = display->next) {
776 region = get_region(ctx, display->region_id);
784 rect = sub->rects[i];
785 rect->x = display->x_pos + offset_x;
786 rect->y = display->y_pos + offset_y;
787 rect->w = region->width;
788 rect->h = region->height;
789 rect->nb_colors = (1 << region->depth);
790 rect->type = SUBTITLE_BITMAP;
791 rect->linesize[0] = region->width;
793 clut = get_clut(ctx, region->clut);
796 clut = &default_clut;
798 switch (region->depth) {
800 clut_table = clut->clut4;
803 clut_table = clut->clut256;
807 clut_table = clut->clut16;
811 rect->data[1] = av_mallocz(AVPALETTE_SIZE);
812 if (!rect->data[1]) {
813 ret = AVERROR(ENOMEM);
816 memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(*clut_table));
818 rect->data[0] = av_malloc(region->buf_size);
819 if (!rect->data[0]) {
820 ret = AVERROR(ENOMEM);
824 memcpy(rect->data[0], region->pbuf, region->buf_size);
826 if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1) {
827 if (!region->has_computed_clut) {
828 compute_default_clut(ctx, region->computed_clut, rect, rect->w, rect->h);
829 region->has_computed_clut = 1;
832 memcpy(rect->data[1], region->computed_clut, sizeof(region->computed_clut));
836 FF_DISABLE_DEPRECATION_WARNINGS
839 for (j = 0; j < 4; j++) {
840 rect->pict.data[j] = rect->data[j];
841 rect->pict.linesize[j] = rect->linesize[j];
844 FF_ENABLE_DEPRECATION_WARNINGS
854 for (i=0; i < sub->num_rects; i++) {
855 rect = sub->rects[i];
857 av_freep(&rect->data[0]);
858 av_freep(&rect->data[1]);
860 av_freep(&sub->rects[i]);
862 av_freep(&sub->rects);
868 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
869 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
871 DVBSubContext *ctx = avctx->priv_data;
873 DVBSubRegion *region = get_region(ctx, display->region_id);
874 const uint8_t *buf_end = buf + buf_size;
879 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
880 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
881 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
882 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
886 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
887 top_bottom ? "bottom" : "top");
889 for (i = 0; i < buf_size; i++) {
891 ff_dlog(avctx, "0x%8p: ", buf+i);
893 ff_dlog(avctx, "%02x ", buf[i]);
895 ff_dlog(avctx, "\n");
899 ff_dlog(avctx, "\n");
908 x_pos = display->x_pos;
909 y_pos = display->y_pos;
913 while (buf < buf_end) {
914 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
915 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
921 if (region->depth == 8)
923 else if (region->depth == 4)
928 x_pos = dvbsub_read_2bit_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 < 4) {
934 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
938 if (region->depth == 8)
943 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
944 region->width, &buf, buf_end - buf,
945 non_mod, map_table, x_pos);
948 if (region->depth < 8) {
949 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
953 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
954 region->width, &buf, buf_end - buf,
955 non_mod, NULL, x_pos);
959 map2to4[0] = (*buf) >> 4;
960 map2to4[1] = (*buf++) & 0xf;
961 map2to4[2] = (*buf) >> 4;
962 map2to4[3] = (*buf++) & 0xf;
965 for (i = 0; i < 4; i++)
969 for (i = 0; i < 16; i++)
974 x_pos = display->x_pos;
978 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
982 region->has_computed_clut = 0;
985 static int dvbsub_parse_object_segment(AVCodecContext *avctx,
986 const uint8_t *buf, int buf_size)
988 DVBSubContext *ctx = avctx->priv_data;
990 const uint8_t *buf_end = buf + buf_size;
992 DVBSubObject *object;
993 DVBSubObjectDisplay *display;
994 int top_field_len, bottom_field_len;
996 int coding_method, non_modifying_color;
998 object_id = AV_RB16(buf);
1001 object = get_object(ctx, object_id);
1004 return AVERROR_INVALIDDATA;
1006 coding_method = ((*buf) >> 2) & 3;
1007 non_modifying_color = ((*buf++) >> 1) & 1;
1009 if (coding_method == 0) {
1010 top_field_len = AV_RB16(buf);
1012 bottom_field_len = AV_RB16(buf);
1015 if (buf + top_field_len + bottom_field_len > buf_end) {
1016 av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1017 return AVERROR_INVALIDDATA;
1020 for (display = object->display_list; display; display = display->object_list_next) {
1021 const uint8_t *block = buf;
1022 int bfl = bottom_field_len;
1024 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1025 non_modifying_color);
1027 if (bottom_field_len > 0)
1028 block = buf + top_field_len;
1030 bfl = top_field_len;
1032 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1033 non_modifying_color);
1036 /* } else if (coding_method == 1) {*/
1039 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1045 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1046 const uint8_t *buf, int buf_size)
1048 DVBSubContext *ctx = avctx->priv_data;
1050 const uint8_t *buf_end = buf + buf_size;
1054 int entry_id, depth , full_range;
1055 int y, cr, cb, alpha;
1056 int r, g, b, r_add, g_add, b_add;
1058 ff_dlog(avctx, "DVB clut packet:\n");
1060 for (i=0; i < buf_size; i++) {
1061 ff_dlog(avctx, "%02x ", buf[i]);
1063 ff_dlog(avctx, "\n");
1067 ff_dlog(avctx, "\n");
1070 version = ((*buf)>>4)&15;
1073 clut = get_clut(ctx, clut_id);
1076 clut = av_malloc(sizeof(*clut));
1078 return AVERROR(ENOMEM);
1080 memcpy(clut, &default_clut, sizeof(*clut));
1085 clut->next = ctx->clut_list;
1086 ctx->clut_list = clut;
1089 if (clut->version != version) {
1091 clut->version = version;
1093 while (buf + 4 < buf_end) {
1096 depth = (*buf) & 0xe0;
1099 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1102 full_range = (*buf++) & 1;
1111 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1112 cb = (buf[1] << 2) & 0xf0;
1113 alpha = (buf[1] << 6) & 0xc0;
1121 YUV_TO_RGB1_CCIR(cb, cr);
1122 YUV_TO_RGB2_CCIR(r, g, b, y);
1124 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1125 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1126 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1127 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1128 return AVERROR_INVALIDDATA;
1131 if (depth & 0x80 && entry_id < 4)
1132 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1133 else if (depth & 0x40 && entry_id < 16)
1134 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1135 else if (depth & 0x20)
1136 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1144 static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1145 const uint8_t *buf, int buf_size)
1147 DVBSubContext *ctx = avctx->priv_data;
1149 const uint8_t *buf_end = buf + buf_size;
1150 int region_id, object_id;
1151 int av_unused version;
1152 DVBSubRegion *region;
1153 DVBSubObject *object;
1154 DVBSubObjectDisplay *display;
1159 return AVERROR_INVALIDDATA;
1163 region = get_region(ctx, region_id);
1166 region = av_mallocz(sizeof(*region));
1168 return AVERROR(ENOMEM);
1170 region->id = region_id;
1171 region->version = -1;
1173 region->next = ctx->region_list;
1174 ctx->region_list = region;
1177 version = ((*buf)>>4) & 15;
1178 fill = ((*buf++) >> 3) & 1;
1180 region->width = AV_RB16(buf);
1182 region->height = AV_RB16(buf);
1185 ret = av_image_check_size2(region->width, region->height, avctx->max_pixels, AV_PIX_FMT_PAL8, 0, avctx);
1186 if (ret >= 0 && region->width * region->height * 2 > 320 * 1024 * 8) {
1187 ret = AVERROR_INVALIDDATA;
1188 av_log(avctx, AV_LOG_ERROR, "Pixel buffer memory constraint violated\n");
1191 region->width= region->height= 0;
1195 if (region->width * region->height != region->buf_size) {
1196 av_free(region->pbuf);
1198 region->buf_size = region->width * region->height;
1200 region->pbuf = av_malloc(region->buf_size);
1201 if (!region->pbuf) {
1205 return AVERROR(ENOMEM);
1212 region->depth = 1 << (((*buf++) >> 2) & 7);
1213 if (region->depth < 2 || region->depth > 8) {
1214 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1217 region->clut = *buf++;
1219 if (region->depth == 8) {
1220 region->bgcolor = *buf++;
1225 if (region->depth == 4)
1226 region->bgcolor = (((*buf++) >> 4) & 15);
1228 region->bgcolor = (((*buf++) >> 2) & 3);
1231 ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1234 memset(region->pbuf, region->bgcolor, region->buf_size);
1235 ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1238 delete_region_display_list(ctx, region);
1240 while (buf + 5 < buf_end) {
1241 object_id = AV_RB16(buf);
1244 object = get_object(ctx, object_id);
1247 object = av_mallocz(sizeof(*object));
1249 return AVERROR(ENOMEM);
1251 object->id = object_id;
1252 object->next = ctx->object_list;
1253 ctx->object_list = object;
1256 object->type = (*buf) >> 6;
1258 display = av_mallocz(sizeof(*display));
1260 return AVERROR(ENOMEM);
1262 display->object_id = object_id;
1263 display->region_id = region_id;
1265 display->x_pos = AV_RB16(buf) & 0xfff;
1267 display->y_pos = AV_RB16(buf) & 0xfff;
1270 if (display->x_pos >= region->width ||
1271 display->y_pos >= region->height) {
1272 av_log(avctx, AV_LOG_ERROR, "Object outside region\n");
1274 return AVERROR_INVALIDDATA;
1277 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1278 display->fgcolor = *buf++;
1279 display->bgcolor = *buf++;
1282 display->region_list_next = region->display_list;
1283 region->display_list = display;
1285 display->object_list_next = object->display_list;
1286 object->display_list = display;
1292 static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1293 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1295 DVBSubContext *ctx = avctx->priv_data;
1296 DVBSubRegionDisplay *display;
1297 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1299 const uint8_t *buf_end = buf + buf_size;
1306 return AVERROR_INVALIDDATA;
1309 version = ((*buf)>>4) & 15;
1310 page_state = ((*buf++) >> 2) & 3;
1312 if (ctx->version == version) {
1316 ctx->time_out = timeout;
1317 ctx->version = version;
1319 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1321 if (ctx->compute_edt == 1)
1322 save_subtitle_set(avctx, sub, got_output);
1324 if (page_state == 1 || page_state == 2) {
1325 delete_regions(ctx);
1326 delete_objects(ctx);
1330 tmp_display_list = ctx->display_list;
1331 ctx->display_list = NULL;
1333 while (buf + 5 < buf_end) {
1337 display = ctx->display_list;
1338 while (display && display->region_id != region_id) {
1339 display = display->next;
1342 av_log(avctx, AV_LOG_ERROR, "duplicate region\n");
1346 display = tmp_display_list;
1347 tmp_ptr = &tmp_display_list;
1349 while (display && display->region_id != region_id) {
1350 tmp_ptr = &display->next;
1351 display = display->next;
1355 display = av_mallocz(sizeof(*display));
1357 return AVERROR(ENOMEM);
1360 display->region_id = region_id;
1362 display->x_pos = AV_RB16(buf);
1364 display->y_pos = AV_RB16(buf);
1367 *tmp_ptr = display->next;
1369 display->next = ctx->display_list;
1370 ctx->display_list = display;
1372 ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1375 while (tmp_display_list) {
1376 display = tmp_display_list;
1378 tmp_display_list = display->next;
1388 static void png_save(DVBSubContext *ctx, const char *filename, uint32_t *bitmap, int w, int h)
1392 char fname[40], fname2[40];
1395 snprintf(fname, sizeof(fname), "%s.ppm", filename);
1397 f = fopen(fname, "w");
1406 for(y = 0; y < h; y++) {
1407 for(x = 0; x < w; x++) {
1408 v = bitmap[y * w + x];
1409 putc((v >> 16) & 0xff, f);
1410 putc((v >> 8) & 0xff, f);
1411 putc((v >> 0) & 0xff, f);
1417 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
1419 f = fopen(fname2, "w");
1428 for(y = 0; y < h; y++) {
1429 for(x = 0; x < w; x++) {
1430 v = bitmap[y * w + x];
1431 putc((v >> 24) & 0xff, f);
1436 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
1437 if (system(command) != 0) {
1438 av_log(ctx, AV_LOG_ERROR, "Error running pnmtopng\n");
1442 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
1443 if (system(command) != 0) {
1444 av_log(ctx, AV_LOG_ERROR, "Error removing %s and %s\n", fname, fname2);
1449 static int save_display_set(DVBSubContext *ctx)
1451 DVBSubRegion *region;
1452 DVBSubRegionDisplay *display;
1454 uint32_t *clut_table;
1455 int x_pos, y_pos, width, height;
1456 int x, y, y_off, x_off;
1459 static int fileno_index = 0;
1466 for (display = ctx->display_list; display; display = display->next) {
1467 region = get_region(ctx, display->region_id);
1473 x_pos = display->x_pos;
1474 y_pos = display->y_pos;
1475 width = region->width;
1476 height = region->height;
1478 if (display->x_pos < x_pos) {
1479 width += (x_pos - display->x_pos);
1480 x_pos = display->x_pos;
1483 if (display->y_pos < y_pos) {
1484 height += (y_pos - display->y_pos);
1485 y_pos = display->y_pos;
1488 if (display->x_pos + region->width > x_pos + width) {
1489 width = display->x_pos + region->width - x_pos;
1492 if (display->y_pos + region->height > y_pos + height) {
1493 height = display->y_pos + region->height - y_pos;
1500 pbuf = av_malloc(width * height * 4);
1504 for (display = ctx->display_list; display; display = display->next) {
1505 region = get_region(ctx, display->region_id);
1510 x_off = display->x_pos - x_pos;
1511 y_off = display->y_pos - y_pos;
1513 clut = get_clut(ctx, region->clut);
1516 clut = &default_clut;
1518 switch (region->depth) {
1520 clut_table = clut->clut4;
1523 clut_table = clut->clut256;
1527 clut_table = clut->clut16;
1531 for (y = 0; y < region->height; y++) {
1532 for (x = 0; x < region->width; x++) {
1533 pbuf[((y + y_off) * width) + x_off + x] =
1534 clut_table[region->pbuf[y * region->width + x]];
1540 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1542 png_save(ctx, filename, pbuf, width, height);
1552 static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1556 DVBSubContext *ctx = avctx->priv_data;
1557 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1558 int dds_version, info_byte;
1561 return AVERROR_INVALIDDATA;
1563 info_byte = bytestream_get_byte(&buf);
1564 dds_version = info_byte >> 4;
1565 if (display_def && display_def->version == dds_version)
1566 return 0; // already have this display definition version
1569 display_def = av_mallocz(sizeof(*display_def));
1571 return AVERROR(ENOMEM);
1572 ctx->display_definition = display_def;
1575 display_def->version = dds_version;
1578 display_def->width = bytestream_get_be16(&buf) + 1;
1579 display_def->height = bytestream_get_be16(&buf) + 1;
1580 if (!avctx->width || !avctx->height) {
1581 int ret = ff_set_dimensions(avctx, display_def->width, display_def->height);
1586 if (info_byte & 1<<3) { // display_window_flag
1588 return AVERROR_INVALIDDATA;
1590 display_def->x = bytestream_get_be16(&buf);
1591 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1592 display_def->y = bytestream_get_be16(&buf);
1593 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1599 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1600 int buf_size, AVSubtitle *sub,int *got_output)
1602 DVBSubContext *ctx = avctx->priv_data;
1604 if (ctx->compute_edt == 0)
1605 save_subtitle_set(avctx, sub, got_output);
1607 save_display_set(ctx);
1612 static int dvbsub_decode(AVCodecContext *avctx,
1613 void *data, int *got_sub_ptr,
1616 const uint8_t *buf = avpkt->data;
1617 int buf_size = avpkt->size;
1618 DVBSubContext *ctx = avctx->priv_data;
1619 AVSubtitle *sub = data;
1620 const uint8_t *p, *p_end;
1626 int got_segment = 0;
1629 ff_dlog(avctx, "DVB sub packet:\n");
1631 for (i=0; i < buf_size; i++) {
1632 ff_dlog(avctx, "%02x ", buf[i]);
1634 ff_dlog(avctx, "\n");
1638 ff_dlog(avctx, "\n");
1640 if (buf_size <= 6 || *buf != 0x0f) {
1641 ff_dlog(avctx, "incomplete or broken packet");
1642 return AVERROR_INVALIDDATA;
1646 p_end = buf + buf_size;
1648 while (p_end - p >= 6 && *p == 0x0f) {
1650 segment_type = *p++;
1651 page_id = AV_RB16(p);
1653 segment_length = AV_RB16(p);
1656 if (avctx->debug & FF_DEBUG_STARTCODE) {
1657 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1660 if (p_end - p < segment_length) {
1661 ff_dlog(avctx, "incomplete or broken packet");
1666 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1667 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1669 switch (segment_type) {
1670 case DVBSUB_PAGE_SEGMENT:
1671 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, got_sub_ptr);
1674 case DVBSUB_REGION_SEGMENT:
1675 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1678 case DVBSUB_CLUT_SEGMENT:
1679 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1680 if (ret < 0) goto end;
1683 case DVBSUB_OBJECT_SEGMENT:
1684 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1687 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1688 ret = dvbsub_parse_display_definition_segment(avctx, p,
1692 case DVBSUB_DISPLAY_SEGMENT:
1693 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, got_sub_ptr);
1694 if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1695 // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1697 avctx->height = 576;
1702 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1703 segment_type, page_id, segment_length);
1710 p += segment_length;
1712 // Some streams do not send a display segment but if we have all the other
1713 // segments then we need no further data.
1714 if (got_segment == 15) {
1715 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1716 dvbsub_display_end_segment(avctx, p, 0, sub, got_sub_ptr);
1722 avsubtitle_free(sub);
1725 if (ctx->compute_edt == 1)
1726 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1732 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1733 #define OFFSET(x) offsetof(DVBSubContext, x)
1734 static const AVOption options[] = {
1735 {"compute_edt", "compute end of time using pts or timeout", OFFSET(compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1736 {"compute_clut", "compute clut when not available(-1) or always(1) or never(0)", OFFSET(compute_clut), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, DS},
1737 {"dvb_substream", "", OFFSET(substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1740 static const AVClass dvbsubdec_class = {
1741 .class_name = "DVB Sub Decoder",
1742 .item_name = av_default_item_name,
1744 .version = LIBAVUTIL_VERSION_INT,
1747 AVCodec ff_dvbsub_decoder = {
1749 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1750 .type = AVMEDIA_TYPE_SUBTITLE,
1751 .id = AV_CODEC_ID_DVB_SUBTITLE,
1752 .priv_data_size = sizeof(DVBSubContext),
1753 .init = dvbsub_init_decoder,
1754 .close = dvbsub_close_decoder,
1755 .decode = dvbsub_decode,
1756 .priv_class = &dvbsubdec_class,