2 * DVB subtitle decoding
3 * Copyright (c) 2005 Ian Caulfield
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "bytestream.h"
26 #include "libavutil/colorspace.h"
27 #include "libavutil/opt.h"
29 #define DVBSUB_PAGE_SEGMENT 0x10
30 #define DVBSUB_REGION_SEGMENT 0x11
31 #define DVBSUB_CLUT_SEGMENT 0x12
32 #define DVBSUB_OBJECT_SEGMENT 0x13
33 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
34 #define DVBSUB_DISPLAY_SEGMENT 0x80
36 #define cm (ff_crop_tab + MAX_NEG_CROP)
40 static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
41 uint32_t *rgba_palette)
45 char fname[40], fname2[40];
48 snprintf(fname, 40, "%s.ppm", filename);
50 f = fopen(fname, "w");
59 for(y = 0; y < h; y++) {
60 for(x = 0; x < w; x++) {
61 v = rgba_palette[bitmap[y * w + x]];
62 putc((v >> 16) & 0xff, f);
63 putc((v >> 8) & 0xff, f);
64 putc((v >> 0) & 0xff, f);
70 snprintf(fname2, 40, "%s-a.pgm", filename);
72 f = fopen(fname2, "w");
81 for(y = 0; y < h; y++) {
82 for(x = 0; x < w; x++) {
83 v = rgba_palette[bitmap[y * w + x]];
84 putc((v >> 24) & 0xff, f);
89 snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
92 snprintf(command, 1024, "rm %s %s", fname, fname2);
97 static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
101 char fname[40], fname2[40];
104 snprintf(fname, sizeof(fname), "%s.ppm", filename);
106 f = fopen(fname, "w");
115 for(y = 0; y < h; y++) {
116 for(x = 0; x < w; x++) {
117 v = bitmap[y * w + x];
118 putc((v >> 16) & 0xff, f);
119 putc((v >> 8) & 0xff, f);
120 putc((v >> 0) & 0xff, f);
126 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
128 f = fopen(fname2, "w");
137 for(y = 0; y < h; y++) {
138 for(x = 0; x < w; x++) {
139 v = bitmap[y * w + x];
140 putc((v >> 24) & 0xff, f);
145 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
148 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
153 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
155 typedef struct DVBSubCLUT {
161 uint32_t clut256[256];
163 struct DVBSubCLUT *next;
166 static DVBSubCLUT default_clut;
168 typedef struct DVBSubObjectDisplay {
178 struct DVBSubObjectDisplay *region_list_next;
179 struct DVBSubObjectDisplay *object_list_next;
180 } DVBSubObjectDisplay;
182 typedef struct DVBSubObject {
188 DVBSubObjectDisplay *display_list;
190 struct DVBSubObject *next;
193 typedef struct DVBSubRegionDisplay {
199 struct DVBSubRegionDisplay *next;
200 } DVBSubRegionDisplay;
202 typedef struct DVBSubRegion {
217 DVBSubObjectDisplay *display_list;
219 struct DVBSubRegion *next;
222 typedef struct DVBSubDisplayDefinition {
229 } DVBSubDisplayDefinition;
231 typedef struct DVBSubContext {
238 int compute_edt; /**< if 1 end display time calculated using pts
239 if 0 (Default) calculated using time out */
241 DVBSubRegion *region_list;
242 DVBSubCLUT *clut_list;
243 DVBSubObject *object_list;
245 DVBSubRegionDisplay *display_list;
246 DVBSubDisplayDefinition *display_definition;
250 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
252 DVBSubObject *ptr = ctx->object_list;
254 while (ptr && ptr->id != object_id) {
261 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
263 DVBSubCLUT *ptr = ctx->clut_list;
265 while (ptr && ptr->id != clut_id) {
272 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
274 DVBSubRegion *ptr = ctx->region_list;
276 while (ptr && ptr->id != region_id) {
283 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
285 DVBSubObject *object, *obj2, **obj2_ptr;
286 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
288 while (region->display_list) {
289 display = region->display_list;
291 object = get_object(ctx, display->object_id);
294 obj_disp_ptr = &object->display_list;
295 obj_disp = *obj_disp_ptr;
297 while (obj_disp && obj_disp != display) {
298 obj_disp_ptr = &obj_disp->object_list_next;
299 obj_disp = *obj_disp_ptr;
303 *obj_disp_ptr = obj_disp->object_list_next;
305 if (!object->display_list) {
306 obj2_ptr = &ctx->object_list;
309 while (obj2 != object) {
311 obj2_ptr = &obj2->next;
315 *obj2_ptr = obj2->next;
322 region->display_list = display->region_list_next;
329 static void delete_cluts(DVBSubContext *ctx)
331 while (ctx->clut_list) {
332 DVBSubCLUT *clut = ctx->clut_list;
334 ctx->clut_list = clut->next;
340 static void delete_objects(DVBSubContext *ctx)
342 while (ctx->object_list) {
343 DVBSubObject *object = ctx->object_list;
345 ctx->object_list = object->next;
351 static void delete_regions(DVBSubContext *ctx)
353 while (ctx->region_list) {
354 DVBSubRegion *region = ctx->region_list;
356 ctx->region_list = region->next;
358 delete_region_display_list(ctx, region);
360 av_freep(®ion->pbuf);
365 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
367 int i, r, g, b, a = 0;
368 DVBSubContext *ctx = avctx->priv_data;
370 if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
371 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
372 ctx->composition_id = -1;
373 ctx->ancillary_id = -1;
375 if (avctx->extradata_size > 5) {
376 av_log(avctx, AV_LOG_WARNING, "Decoding first DVB subtitles sub-stream\n");
379 ctx->composition_id = AV_RB16(avctx->extradata);
380 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
384 ctx->prev_start = AV_NOPTS_VALUE;
386 default_clut.id = -1;
387 default_clut.next = NULL;
389 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
390 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
391 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
392 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
394 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
395 for (i = 1; i < 16; i++) {
397 r = (i & 1) ? 255 : 0;
398 g = (i & 2) ? 255 : 0;
399 b = (i & 4) ? 255 : 0;
401 r = (i & 1) ? 127 : 0;
402 g = (i & 2) ? 127 : 0;
403 b = (i & 4) ? 127 : 0;
405 default_clut.clut16[i] = RGBA(r, g, b, 255);
408 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
409 for (i = 1; i < 256; i++) {
411 r = (i & 1) ? 255 : 0;
412 g = (i & 2) ? 255 : 0;
413 b = (i & 4) ? 255 : 0;
418 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
419 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
420 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
424 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
425 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
426 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
430 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
431 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
432 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
436 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
437 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
438 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
443 default_clut.clut256[i] = RGBA(r, g, b, a);
449 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
451 DVBSubContext *ctx = avctx->priv_data;
452 DVBSubRegionDisplay *display;
460 av_freep(&ctx->display_definition);
462 while (ctx->display_list) {
463 display = ctx->display_list;
464 ctx->display_list = display->next;
472 static int dvbsub_read_2bit_string(AVCodecContext *avctx,
473 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, 2);
491 if (non_mod != 1 || bits != 1) {
493 *destbuf++ = map_table[bits];
499 bits = get_bits1(&gb);
501 run_length = get_bits(&gb, 3) + 3;
502 bits = get_bits(&gb, 2);
504 if (non_mod == 1 && bits == 1)
505 pixels_read += run_length;
508 bits = map_table[bits];
509 while (run_length-- > 0 && pixels_read < dbuf_len) {
515 bits = get_bits1(&gb);
517 bits = get_bits(&gb, 2);
519 run_length = get_bits(&gb, 4) + 12;
520 bits = get_bits(&gb, 2);
522 if (non_mod == 1 && bits == 1)
523 pixels_read += run_length;
526 bits = map_table[bits];
527 while (run_length-- > 0 && pixels_read < dbuf_len) {
532 } else if (bits == 3) {
533 run_length = get_bits(&gb, 8) + 29;
534 bits = get_bits(&gb, 2);
536 if (non_mod == 1 && bits == 1)
537 pixels_read += run_length;
540 bits = map_table[bits];
541 while (run_length-- > 0 && pixels_read < dbuf_len) {
546 } else if (bits == 1) {
552 while (run_length-- > 0 && pixels_read < dbuf_len) {
557 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
572 if (get_bits(&gb, 6))
573 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
575 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
580 static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
581 const uint8_t **srcbuf, int buf_size,
582 int non_mod, uint8_t *map_table, int x_pos)
588 int pixels_read = x_pos;
590 init_get_bits(&gb, *srcbuf, buf_size << 3);
594 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
595 bits = get_bits(&gb, 4);
598 if (non_mod != 1 || bits != 1) {
600 *destbuf++ = map_table[bits];
606 bits = get_bits1(&gb);
608 run_length = get_bits(&gb, 3);
610 if (run_length == 0) {
611 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
622 while (run_length-- > 0 && pixels_read < dbuf_len) {
627 bits = get_bits1(&gb);
629 run_length = get_bits(&gb, 2) + 4;
630 bits = get_bits(&gb, 4);
632 if (non_mod == 1 && bits == 1)
633 pixels_read += run_length;
636 bits = map_table[bits];
637 while (run_length-- > 0 && pixels_read < dbuf_len) {
643 bits = get_bits(&gb, 2);
645 run_length = get_bits(&gb, 4) + 9;
646 bits = get_bits(&gb, 4);
648 if (non_mod == 1 && bits == 1)
649 pixels_read += run_length;
652 bits = map_table[bits];
653 while (run_length-- > 0 && pixels_read < dbuf_len) {
658 } else if (bits == 3) {
659 run_length = get_bits(&gb, 8) + 25;
660 bits = get_bits(&gb, 4);
662 if (non_mod == 1 && bits == 1)
663 pixels_read += run_length;
666 bits = map_table[bits];
667 while (run_length-- > 0 && pixels_read < dbuf_len) {
672 } else if (bits == 1) {
678 while (run_length-- > 0 && pixels_read < dbuf_len) {
695 if (get_bits(&gb, 8))
696 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
698 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
703 static int dvbsub_read_8bit_string(AVCodecContext *avctx,
704 uint8_t *destbuf, int dbuf_len,
705 const uint8_t **srcbuf, int buf_size,
706 int non_mod, uint8_t *map_table, int x_pos)
708 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
711 int pixels_read = x_pos;
715 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
719 if (non_mod != 1 || bits != 1) {
721 *destbuf++ = map_table[bits];
728 run_length = bits & 0x7f;
729 if ((bits & 0x80) == 0) {
730 if (run_length == 0) {
738 if (non_mod == 1 && bits == 1)
739 pixels_read += run_length;
742 bits = map_table[bits];
743 while (run_length-- > 0 && pixels_read < dbuf_len) {
752 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
757 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
759 DVBSubContext *ctx = avctx->priv_data;
760 DVBSubRegionDisplay *display;
761 DVBSubDisplayDefinition *display_def = ctx->display_definition;
762 DVBSubRegion *region;
763 AVSubtitleRect *rect;
765 uint32_t *clut_table;
767 int offset_x=0, offset_y=0;
772 offset_x = display_def->x;
773 offset_y = display_def->y;
776 /* Not touching AVSubtitles again*/
778 avpriv_request_sample(ctx, "Different Version of Segment asked Twice\n");
779 return AVERROR_PATCHWELCOME;
781 for (display = ctx->display_list; display; display = display->next) {
782 region = get_region(ctx, display->region_id);
783 if (region && region->dirty)
787 if(ctx->compute_edt == 0) {
788 sub->end_display_time = ctx->time_out * 1000;
790 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
791 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
794 if (sub->num_rects > 0) {
796 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
798 ret = AVERROR(ENOMEM);
802 for(i=0; i<sub->num_rects; i++)
803 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
807 for (display = ctx->display_list; display; display = display->next) {
808 region = get_region(ctx, display->region_id);
816 rect = sub->rects[i];
817 rect->x = display->x_pos + offset_x;
818 rect->y = display->y_pos + offset_y;
819 rect->w = region->width;
820 rect->h = region->height;
821 rect->nb_colors = (1 << region->depth);
822 rect->type = SUBTITLE_BITMAP;
823 rect->pict.linesize[0] = region->width;
825 clut = get_clut(ctx, region->clut);
828 clut = &default_clut;
830 switch (region->depth) {
832 clut_table = clut->clut4;
835 clut_table = clut->clut256;
839 clut_table = clut->clut16;
843 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
844 if (!rect->pict.data[1]) {
845 ret = AVERROR(ENOMEM);
848 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
850 rect->pict.data[0] = av_malloc(region->buf_size);
851 if (!rect->pict.data[0]) {
852 ret = AVERROR(ENOMEM);
856 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
865 for(i=0; i<sub->num_rects; i++) {
866 rect = sub->rects[i];
868 av_freep(&rect->pict.data[0]);
869 av_freep(&rect->pict.data[1]);
871 av_freep(&sub->rects[i]);
873 av_freep(&sub->rects);
879 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
880 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
882 DVBSubContext *ctx = avctx->priv_data;
884 DVBSubRegion *region = get_region(ctx, display->region_id);
885 const uint8_t *buf_end = buf + buf_size;
890 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
891 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
892 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
893 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
897 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
898 top_bottom ? "bottom" : "top");
900 for (i = 0; i < buf_size; i++) {
902 ff_dlog(avctx, "0x%8p: ", buf+i);
904 ff_dlog(avctx, "%02x ", buf[i]);
906 ff_dlog(avctx, "\n");
910 ff_dlog(avctx, "\n");
919 x_pos = display->x_pos;
920 y_pos = display->y_pos;
924 while (buf < buf_end) {
925 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
926 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
932 if (region->depth == 8)
934 else if (region->depth == 4)
939 x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
940 region->width, &buf, buf_end - buf,
941 non_mod, map_table, x_pos);
944 if (region->depth < 4) {
945 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
949 if (region->depth == 8)
954 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
955 region->width, &buf, buf_end - buf,
956 non_mod, map_table, x_pos);
959 if (region->depth < 8) {
960 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
964 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
965 region->width, &buf, buf_end - buf,
966 non_mod, NULL, x_pos);
970 map2to4[0] = (*buf) >> 4;
971 map2to4[1] = (*buf++) & 0xf;
972 map2to4[2] = (*buf) >> 4;
973 map2to4[3] = (*buf++) & 0xf;
976 for (i = 0; i < 4; i++)
980 for (i = 0; i < 16; i++)
985 x_pos = display->x_pos;
989 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
995 static int dvbsub_parse_object_segment(AVCodecContext *avctx,
996 const uint8_t *buf, int buf_size)
998 DVBSubContext *ctx = avctx->priv_data;
1000 const uint8_t *buf_end = buf + buf_size;
1002 DVBSubObject *object;
1003 DVBSubObjectDisplay *display;
1004 int top_field_len, bottom_field_len;
1006 int coding_method, non_modifying_color;
1008 object_id = AV_RB16(buf);
1011 object = get_object(ctx, object_id);
1014 return AVERROR_INVALIDDATA;
1016 coding_method = ((*buf) >> 2) & 3;
1017 non_modifying_color = ((*buf++) >> 1) & 1;
1019 if (coding_method == 0) {
1020 top_field_len = AV_RB16(buf);
1022 bottom_field_len = AV_RB16(buf);
1025 if (buf + top_field_len + bottom_field_len > buf_end) {
1026 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
1027 return AVERROR_INVALIDDATA;
1030 for (display = object->display_list; display; display = display->object_list_next) {
1031 const uint8_t *block = buf;
1032 int bfl = bottom_field_len;
1034 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1035 non_modifying_color);
1037 if (bottom_field_len > 0)
1038 block = buf + top_field_len;
1040 bfl = top_field_len;
1042 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1043 non_modifying_color);
1046 /* } else if (coding_method == 1) {*/
1049 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1055 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1056 const uint8_t *buf, int buf_size)
1058 DVBSubContext *ctx = avctx->priv_data;
1060 const uint8_t *buf_end = buf + buf_size;
1064 int entry_id, depth , full_range;
1065 int y, cr, cb, alpha;
1066 int r, g, b, r_add, g_add, b_add;
1068 ff_dlog(avctx, "DVB clut packet:\n");
1070 for (i=0; i < buf_size; i++) {
1071 ff_dlog(avctx, "%02x ", buf[i]);
1073 ff_dlog(avctx, "\n");
1077 ff_dlog(avctx, "\n");
1080 version = ((*buf)>>4)&15;
1083 clut = get_clut(ctx, clut_id);
1086 clut = av_malloc(sizeof(DVBSubCLUT));
1088 return AVERROR(ENOMEM);
1090 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1095 clut->next = ctx->clut_list;
1096 ctx->clut_list = clut;
1099 if (clut->version != version) {
1101 clut->version = version;
1103 while (buf + 4 < buf_end) {
1106 depth = (*buf) & 0xe0;
1109 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1110 return AVERROR_INVALIDDATA;
1113 full_range = (*buf++) & 1;
1122 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1123 cb = (buf[1] << 2) & 0xf0;
1124 alpha = (buf[1] << 6) & 0xc0;
1132 YUV_TO_RGB1_CCIR(cb, cr);
1133 YUV_TO_RGB2_CCIR(r, g, b, y);
1135 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1136 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1137 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1138 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1139 return AVERROR_INVALIDDATA;
1143 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1144 else if (depth & 0x40)
1145 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1146 else if (depth & 0x20)
1147 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1155 static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1156 const uint8_t *buf, int buf_size)
1158 DVBSubContext *ctx = avctx->priv_data;
1160 const uint8_t *buf_end = buf + buf_size;
1161 int region_id, object_id;
1162 int av_unused version;
1163 DVBSubRegion *region;
1164 DVBSubObject *object;
1165 DVBSubObjectDisplay *display;
1169 return AVERROR_INVALIDDATA;
1173 region = get_region(ctx, region_id);
1176 region = av_mallocz(sizeof(DVBSubRegion));
1178 return AVERROR(ENOMEM);
1180 region->id = region_id;
1181 region->version = -1;
1183 region->next = ctx->region_list;
1184 ctx->region_list = region;
1187 version = ((*buf)>>4) & 15;
1188 fill = ((*buf++) >> 3) & 1;
1190 region->width = AV_RB16(buf);
1192 region->height = AV_RB16(buf);
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(DVBSubObject));
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(DVBSubObjectDisplay));
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 ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1271 display->fgcolor = *buf++;
1272 display->bgcolor = *buf++;
1275 display->region_list_next = region->display_list;
1276 region->display_list = display;
1278 display->object_list_next = object->display_list;
1279 object->display_list = display;
1285 static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1286 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1288 DVBSubContext *ctx = avctx->priv_data;
1289 DVBSubRegionDisplay *display;
1290 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1292 const uint8_t *buf_end = buf + buf_size;
1299 return AVERROR_INVALIDDATA;
1302 version = ((*buf)>>4) & 15;
1303 page_state = ((*buf++) >> 2) & 3;
1305 if (ctx->version == version) {
1309 ctx->time_out = timeout;
1310 ctx->version = version;
1312 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1314 if(ctx->compute_edt == 1)
1315 save_subtitle_set(avctx, sub, got_output);
1317 if (page_state == 1 || page_state == 2) {
1318 delete_regions(ctx);
1319 delete_objects(ctx);
1323 tmp_display_list = ctx->display_list;
1324 ctx->display_list = NULL;
1326 while (buf + 5 < buf_end) {
1330 display = tmp_display_list;
1331 tmp_ptr = &tmp_display_list;
1333 while (display && display->region_id != region_id) {
1334 tmp_ptr = &display->next;
1335 display = display->next;
1339 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1341 return AVERROR(ENOMEM);
1344 display->region_id = region_id;
1346 display->x_pos = AV_RB16(buf);
1348 display->y_pos = AV_RB16(buf);
1351 *tmp_ptr = display->next;
1353 display->next = ctx->display_list;
1354 ctx->display_list = display;
1356 ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1359 while (tmp_display_list) {
1360 display = tmp_display_list;
1362 tmp_display_list = display->next;
1372 static void save_display_set(DVBSubContext *ctx)
1374 DVBSubRegion *region;
1375 DVBSubRegionDisplay *display;
1377 uint32_t *clut_table;
1378 int x_pos, y_pos, width, height;
1379 int x, y, y_off, x_off;
1382 static int fileno_index = 0;
1389 for (display = ctx->display_list; display; display = display->next) {
1390 region = get_region(ctx, display->region_id);
1396 x_pos = display->x_pos;
1397 y_pos = display->y_pos;
1398 width = region->width;
1399 height = region->height;
1401 if (display->x_pos < x_pos) {
1402 width += (x_pos - display->x_pos);
1403 x_pos = display->x_pos;
1406 if (display->y_pos < y_pos) {
1407 height += (y_pos - display->y_pos);
1408 y_pos = display->y_pos;
1411 if (display->x_pos + region->width > x_pos + width) {
1412 width = display->x_pos + region->width - x_pos;
1415 if (display->y_pos + region->height > y_pos + height) {
1416 height = display->y_pos + region->height - y_pos;
1423 pbuf = av_malloc(width * height * 4);
1427 for (display = ctx->display_list; display; display = display->next) {
1428 region = get_region(ctx, display->region_id);
1433 x_off = display->x_pos - x_pos;
1434 y_off = display->y_pos - y_pos;
1436 clut = get_clut(ctx, region->clut);
1439 clut = &default_clut;
1441 switch (region->depth) {
1443 clut_table = clut->clut4;
1446 clut_table = clut->clut256;
1450 clut_table = clut->clut16;
1454 for (y = 0; y < region->height; y++) {
1455 for (x = 0; x < region->width; x++) {
1456 pbuf[((y + y_off) * width) + x_off + x] =
1457 clut_table[region->pbuf[y * region->width + x]];
1463 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1465 png_save2(filename, pbuf, width, height);
1474 static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1478 DVBSubContext *ctx = avctx->priv_data;
1479 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1480 int dds_version, info_byte;
1483 return AVERROR_INVALIDDATA;
1485 info_byte = bytestream_get_byte(&buf);
1486 dds_version = info_byte >> 4;
1487 if (display_def && display_def->version == dds_version)
1488 return 0; // already have this display definition version
1491 display_def = av_mallocz(sizeof(*display_def));
1493 return AVERROR(ENOMEM);
1494 ctx->display_definition = display_def;
1497 display_def->version = dds_version;
1500 display_def->width = bytestream_get_be16(&buf) + 1;
1501 display_def->height = bytestream_get_be16(&buf) + 1;
1502 if (!avctx->width || !avctx->height) {
1503 avctx->width = display_def->width;
1504 avctx->height = display_def->height;
1507 if (info_byte & 1<<3) { // display_window_flag
1509 return AVERROR_INVALIDDATA;
1511 display_def->x = bytestream_get_be16(&buf);
1512 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1513 display_def->y = bytestream_get_be16(&buf);
1514 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1520 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1521 int buf_size, AVSubtitle *sub,int *got_output)
1523 DVBSubContext *ctx = avctx->priv_data;
1525 if(ctx->compute_edt == 0)
1526 save_subtitle_set(avctx, sub, got_output);
1528 save_display_set(ctx);
1533 static int dvbsub_decode(AVCodecContext *avctx,
1534 void *data, int *data_size,
1537 const uint8_t *buf = avpkt->data;
1538 int buf_size = avpkt->size;
1539 DVBSubContext *ctx = avctx->priv_data;
1540 AVSubtitle *sub = data;
1541 const uint8_t *p, *p_end;
1547 int got_segment = 0;
1549 ff_dlog(avctx, "DVB sub packet:\n");
1551 for (i=0; i < buf_size; i++) {
1552 ff_dlog(avctx, "%02x ", buf[i]);
1554 ff_dlog(avctx, "\n");
1558 ff_dlog(avctx, "\n");
1560 if (buf_size <= 6 || *buf != 0x0f) {
1561 ff_dlog(avctx, "incomplete or broken packet");
1562 return AVERROR_INVALIDDATA;
1566 p_end = buf + buf_size;
1568 while (p_end - p >= 6 && *p == 0x0f) {
1570 segment_type = *p++;
1571 page_id = AV_RB16(p);
1573 segment_length = AV_RB16(p);
1576 if (avctx->debug & FF_DEBUG_STARTCODE) {
1577 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1580 if (p_end - p < segment_length) {
1581 ff_dlog(avctx, "incomplete or broken packet");
1586 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1587 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1589 switch (segment_type) {
1590 case DVBSUB_PAGE_SEGMENT:
1591 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1594 case DVBSUB_REGION_SEGMENT:
1595 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1598 case DVBSUB_CLUT_SEGMENT:
1599 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1600 if (ret < 0) goto end;
1603 case DVBSUB_OBJECT_SEGMENT:
1604 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1607 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1608 ret = dvbsub_parse_display_definition_segment(avctx, p,
1611 case DVBSUB_DISPLAY_SEGMENT:
1612 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1616 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1617 segment_type, page_id, segment_length);
1624 p += segment_length;
1626 // Some streams do not send a display segment but if we have all the other
1627 // segments then we need no further data.
1628 if (got_segment == 15) {
1629 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1630 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1636 avsubtitle_free(sub);
1639 if(ctx->compute_edt == 1 )
1640 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1646 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1647 static const AVOption options[] = {
1648 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DS},
1651 static const AVClass dvbsubdec_class = {
1652 .class_name = "DVB Sub Decoder",
1653 .item_name = av_default_item_name,
1655 .version = LIBAVUTIL_VERSION_INT,
1658 AVCodec ff_dvbsub_decoder = {
1660 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1661 .type = AVMEDIA_TYPE_SUBTITLE,
1662 .id = AV_CODEC_ID_DVB_SUBTITLE,
1663 .priv_data_size = sizeof(DVBSubContext),
1664 .init = dvbsub_init_decoder,
1665 .close = dvbsub_close_decoder,
1666 .decode = dvbsub_decode,
1667 .priv_class = &dvbsubdec_class,