2 * DVB subtitle decoding for ffmpeg
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"
25 #include "libavutil/colorspace.h"
27 #define DVBSUB_PAGE_SEGMENT 0x10
28 #define DVBSUB_REGION_SEGMENT 0x11
29 #define DVBSUB_CLUT_SEGMENT 0x12
30 #define DVBSUB_OBJECT_SEGMENT 0x13
31 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
32 #define DVBSUB_DISPLAY_SEGMENT 0x80
34 #define cm (ff_cropTbl + 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) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
155 typedef struct DVBSubCLUT {
160 uint32_t clut256[256];
162 struct DVBSubCLUT *next;
165 static DVBSubCLUT default_clut;
167 typedef struct DVBSubObjectDisplay {
177 struct DVBSubObjectDisplay *region_list_next;
178 struct DVBSubObjectDisplay *object_list_next;
179 } DVBSubObjectDisplay;
181 typedef struct DVBSubObject {
186 DVBSubObjectDisplay *display_list;
188 struct DVBSubObject *next;
191 typedef struct DVBSubRegionDisplay {
197 struct DVBSubRegionDisplay *next;
198 } DVBSubRegionDisplay;
200 typedef struct DVBSubRegion {
213 DVBSubObjectDisplay *display_list;
215 struct DVBSubRegion *next;
218 typedef struct DVBSubDisplayDefinition {
225 } DVBSubDisplayDefinition;
227 typedef struct DVBSubContext {
232 DVBSubRegion *region_list;
233 DVBSubCLUT *clut_list;
234 DVBSubObject *object_list;
236 int display_list_size;
237 DVBSubRegionDisplay *display_list;
238 DVBSubDisplayDefinition *display_definition;
242 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
244 DVBSubObject *ptr = ctx->object_list;
246 while (ptr && ptr->id != object_id) {
253 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
255 DVBSubCLUT *ptr = ctx->clut_list;
257 while (ptr && ptr->id != clut_id) {
264 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
266 DVBSubRegion *ptr = ctx->region_list;
268 while (ptr && ptr->id != region_id) {
275 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
277 DVBSubObject *object, *obj2, **obj2_ptr;
278 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
280 while (region->display_list) {
281 display = region->display_list;
283 object = get_object(ctx, display->object_id);
286 obj_disp_ptr = &object->display_list;
287 obj_disp = *obj_disp_ptr;
289 while (obj_disp && obj_disp != display) {
290 obj_disp_ptr = &obj_disp->object_list_next;
291 obj_disp = *obj_disp_ptr;
295 *obj_disp_ptr = obj_disp->object_list_next;
297 if (!object->display_list) {
298 obj2_ptr = &ctx->object_list;
301 while (obj2 != object) {
303 obj2_ptr = &obj2->next;
307 *obj2_ptr = obj2->next;
314 region->display_list = display->region_list_next;
321 static void delete_cluts(DVBSubContext *ctx)
325 while (ctx->clut_list) {
326 clut = ctx->clut_list;
328 ctx->clut_list = clut->next;
334 static void delete_objects(DVBSubContext *ctx)
336 DVBSubObject *object;
338 while (ctx->object_list) {
339 object = ctx->object_list;
341 ctx->object_list = object->next;
347 static void delete_regions(DVBSubContext *ctx)
349 DVBSubRegion *region;
351 while (ctx->region_list) {
352 region = ctx->region_list;
354 ctx->region_list = region->next;
356 delete_region_display_list(ctx, region);
358 av_free(region->pbuf);
363 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
365 int i, r, g, b, a = 0;
366 DVBSubContext *ctx = avctx->priv_data;
368 if (!avctx->extradata || avctx->extradata_size != 4) {
369 av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
370 ctx->composition_id = -1;
371 ctx->ancillary_id = -1;
373 ctx->composition_id = AV_RB16(avctx->extradata);
374 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
377 default_clut.id = -1;
378 default_clut.next = NULL;
380 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
381 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
382 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
383 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
385 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
386 for (i = 1; i < 16; i++) {
388 r = (i & 1) ? 255 : 0;
389 g = (i & 2) ? 255 : 0;
390 b = (i & 4) ? 255 : 0;
392 r = (i & 1) ? 127 : 0;
393 g = (i & 2) ? 127 : 0;
394 b = (i & 4) ? 127 : 0;
396 default_clut.clut16[i] = RGBA(r, g, b, 255);
399 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
400 for (i = 1; i < 256; i++) {
402 r = (i & 1) ? 255 : 0;
403 g = (i & 2) ? 255 : 0;
404 b = (i & 4) ? 255 : 0;
409 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
410 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
411 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
415 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
416 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
417 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
421 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
422 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
423 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
427 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
428 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
429 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
434 default_clut.clut256[i] = RGBA(r, g, b, a);
440 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
442 DVBSubContext *ctx = avctx->priv_data;
443 DVBSubRegionDisplay *display;
451 av_freep(&ctx->display_definition);
453 while (ctx->display_list) {
454 display = ctx->display_list;
455 ctx->display_list = display->next;
463 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
464 const uint8_t **srcbuf, int buf_size,
465 int non_mod, uint8_t *map_table)
473 init_get_bits(&gb, *srcbuf, buf_size << 3);
475 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
476 bits = get_bits(&gb, 2);
479 if (non_mod != 1 || bits != 1) {
481 *destbuf++ = map_table[bits];
487 bits = get_bits1(&gb);
489 run_length = get_bits(&gb, 3) + 3;
490 bits = get_bits(&gb, 2);
492 if (non_mod == 1 && bits == 1)
493 pixels_read += run_length;
496 bits = map_table[bits];
497 while (run_length-- > 0 && pixels_read < dbuf_len) {
503 bits = get_bits1(&gb);
505 bits = get_bits(&gb, 2);
507 run_length = get_bits(&gb, 4) + 12;
508 bits = get_bits(&gb, 2);
510 if (non_mod == 1 && bits == 1)
511 pixels_read += run_length;
514 bits = map_table[bits];
515 while (run_length-- > 0 && pixels_read < dbuf_len) {
520 } else if (bits == 3) {
521 run_length = get_bits(&gb, 8) + 29;
522 bits = get_bits(&gb, 2);
524 if (non_mod == 1 && bits == 1)
525 pixels_read += run_length;
528 bits = map_table[bits];
529 while (run_length-- > 0 && pixels_read < dbuf_len) {
534 } else if (bits == 1) {
540 if (pixels_read <= dbuf_len) {
545 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
560 if (get_bits(&gb, 6))
561 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
563 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
568 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
569 const uint8_t **srcbuf, int buf_size,
570 int non_mod, uint8_t *map_table)
578 init_get_bits(&gb, *srcbuf, buf_size << 3);
580 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
581 bits = get_bits(&gb, 4);
584 if (non_mod != 1 || bits != 1) {
586 *destbuf++ = map_table[bits];
592 bits = get_bits1(&gb);
594 run_length = get_bits(&gb, 3);
596 if (run_length == 0) {
597 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
608 while (run_length-- > 0 && pixels_read < dbuf_len) {
613 bits = get_bits1(&gb);
615 run_length = get_bits(&gb, 2) + 4;
616 bits = get_bits(&gb, 4);
618 if (non_mod == 1 && bits == 1)
619 pixels_read += run_length;
622 bits = map_table[bits];
623 while (run_length-- > 0 && pixels_read < dbuf_len) {
629 bits = get_bits(&gb, 2);
631 run_length = get_bits(&gb, 4) + 9;
632 bits = get_bits(&gb, 4);
634 if (non_mod == 1 && bits == 1)
635 pixels_read += run_length;
638 bits = map_table[bits];
639 while (run_length-- > 0 && pixels_read < dbuf_len) {
644 } else if (bits == 3) {
645 run_length = get_bits(&gb, 8) + 25;
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 == 1) {
664 if (pixels_read <= dbuf_len) {
681 if (get_bits(&gb, 8))
682 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
684 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
689 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
690 const uint8_t **srcbuf, int buf_size,
691 int non_mod, uint8_t *map_table)
693 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
698 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
702 if (non_mod != 1 || bits != 1) {
704 *destbuf++ = map_table[bits];
711 run_length = bits & 0x7f;
712 if ((bits & 0x80) == 0) {
713 if (run_length == 0) {
721 while (run_length-- > 0 && pixels_read < dbuf_len) {
728 if (non_mod == 1 && bits == 1)
729 pixels_read += run_length;
731 bits = map_table[bits];
732 else while (run_length-- > 0 && pixels_read < dbuf_len) {
741 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
748 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
749 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
751 DVBSubContext *ctx = avctx->priv_data;
753 DVBSubRegion *region = get_region(ctx, display->region_id);
754 const uint8_t *buf_end = buf + buf_size;
759 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
760 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
761 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
762 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
765 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
766 top_bottom ? "bottom" : "top");
768 for (i = 0; i < buf_size; i++) {
770 av_dlog(avctx, "0x%8p: ", buf+i);
772 av_dlog(avctx, "%02x ", buf[i]);
774 av_dlog(avctx, "\n");
778 av_dlog(avctx, "\n");
785 x_pos = display->x_pos;
786 y_pos = display->y_pos;
788 if ((y_pos & 1) != top_bottom)
791 while (buf < buf_end) {
792 if (x_pos > region->width || y_pos > region->height) {
793 av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
799 if (region->depth == 8)
801 else if (region->depth == 4)
806 x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
807 region->width - x_pos, &buf, buf_end - buf,
811 if (region->depth < 4) {
812 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
816 if (region->depth == 8)
821 x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
822 region->width - x_pos, &buf, buf_end - buf,
826 if (region->depth < 8) {
827 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
831 x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
832 region->width - x_pos, &buf, buf_end - buf,
837 map2to4[0] = (*buf) >> 4;
838 map2to4[1] = (*buf++) & 0xf;
839 map2to4[2] = (*buf) >> 4;
840 map2to4[3] = (*buf++) & 0xf;
843 for (i = 0; i < 4; i++)
847 for (i = 0; i < 16; i++)
852 x_pos = display->x_pos;
856 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
862 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
863 const uint8_t *buf, int buf_size)
865 DVBSubContext *ctx = avctx->priv_data;
867 const uint8_t *buf_end = buf + buf_size;
868 const uint8_t *block;
870 DVBSubObject *object;
871 DVBSubObjectDisplay *display;
872 int top_field_len, bottom_field_len;
874 int coding_method, non_modifying_color;
876 object_id = AV_RB16(buf);
879 object = get_object(ctx, object_id);
884 coding_method = ((*buf) >> 2) & 3;
885 non_modifying_color = ((*buf++) >> 1) & 1;
887 if (coding_method == 0) {
888 top_field_len = AV_RB16(buf);
890 bottom_field_len = AV_RB16(buf);
893 if (buf + top_field_len + bottom_field_len > buf_end) {
894 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
898 for (display = object->display_list; display; display = display->object_list_next) {
901 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
902 non_modifying_color);
904 if (bottom_field_len > 0)
905 block = buf + top_field_len;
907 bottom_field_len = top_field_len;
909 dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
910 non_modifying_color);
913 /* } else if (coding_method == 1) {*/
916 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
921 static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
922 const uint8_t *buf, int buf_size)
924 DVBSubContext *ctx = avctx->priv_data;
926 const uint8_t *buf_end = buf + buf_size;
929 int entry_id, depth , full_range;
930 int y, cr, cb, alpha;
931 int r, g, b, r_add, g_add, b_add;
933 av_dlog(avctx, "DVB clut packet:\n");
935 for (i=0; i < buf_size; i++) {
936 av_dlog(avctx, "%02x ", buf[i]);
938 av_dlog(avctx, "\n");
942 av_dlog(avctx, "\n");
947 clut = get_clut(ctx, clut_id);
950 clut = av_malloc(sizeof(DVBSubCLUT));
952 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
956 clut->next = ctx->clut_list;
957 ctx->clut_list = clut;
960 while (buf + 4 < buf_end) {
963 depth = (*buf) & 0xe0;
966 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
970 full_range = (*buf++) & 1;
979 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
980 cb = (buf[1] << 2) & 0xf0;
981 alpha = (buf[1] << 6) & 0xc0;
989 YUV_TO_RGB1_CCIR(cb, cr);
990 YUV_TO_RGB2_CCIR(r, g, b, y);
992 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
995 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
997 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
999 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1004 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1005 const uint8_t *buf, int buf_size)
1007 DVBSubContext *ctx = avctx->priv_data;
1009 const uint8_t *buf_end = buf + buf_size;
1010 int region_id, object_id;
1011 DVBSubRegion *region;
1012 DVBSubObject *object;
1013 DVBSubObjectDisplay *display;
1021 region = get_region(ctx, region_id);
1024 region = av_mallocz(sizeof(DVBSubRegion));
1026 region->id = region_id;
1028 region->next = ctx->region_list;
1029 ctx->region_list = region;
1032 fill = ((*buf++) >> 3) & 1;
1034 region->width = AV_RB16(buf);
1036 region->height = AV_RB16(buf);
1039 if (region->width * region->height != region->buf_size) {
1040 av_free(region->pbuf);
1042 region->buf_size = region->width * region->height;
1044 region->pbuf = av_malloc(region->buf_size);
1049 region->depth = 1 << (((*buf++) >> 2) & 7);
1050 if(region->depth<2 || region->depth>8){
1051 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1054 region->clut = *buf++;
1056 if (region->depth == 8)
1057 region->bgcolor = *buf++;
1061 if (region->depth == 4)
1062 region->bgcolor = (((*buf++) >> 4) & 15);
1064 region->bgcolor = (((*buf++) >> 2) & 3);
1067 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1070 memset(region->pbuf, region->bgcolor, region->buf_size);
1071 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1074 delete_region_display_list(ctx, region);
1076 while (buf + 5 < buf_end) {
1077 object_id = AV_RB16(buf);
1080 object = get_object(ctx, object_id);
1083 object = av_mallocz(sizeof(DVBSubObject));
1085 object->id = object_id;
1086 object->next = ctx->object_list;
1087 ctx->object_list = object;
1090 object->type = (*buf) >> 6;
1092 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1094 display->object_id = object_id;
1095 display->region_id = region_id;
1097 display->x_pos = AV_RB16(buf) & 0xfff;
1099 display->y_pos = AV_RB16(buf) & 0xfff;
1102 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1103 display->fgcolor = *buf++;
1104 display->bgcolor = *buf++;
1107 display->region_list_next = region->display_list;
1108 region->display_list = display;
1110 display->object_list_next = object->display_list;
1111 object->display_list = display;
1115 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1116 const uint8_t *buf, int buf_size)
1118 DVBSubContext *ctx = avctx->priv_data;
1119 DVBSubRegionDisplay *display;
1120 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1122 const uint8_t *buf_end = buf + buf_size;
1129 ctx->time_out = *buf++;
1130 page_state = ((*buf++) >> 2) & 3;
1132 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1134 if (page_state == 2) {
1135 delete_regions(ctx);
1136 delete_objects(ctx);
1140 tmp_display_list = ctx->display_list;
1141 ctx->display_list = NULL;
1142 ctx->display_list_size = 0;
1144 while (buf + 5 < buf_end) {
1148 display = tmp_display_list;
1149 tmp_ptr = &tmp_display_list;
1151 while (display && display->region_id != region_id) {
1152 tmp_ptr = &display->next;
1153 display = display->next;
1157 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1159 display->region_id = region_id;
1161 display->x_pos = AV_RB16(buf);
1163 display->y_pos = AV_RB16(buf);
1166 *tmp_ptr = display->next;
1168 display->next = ctx->display_list;
1169 ctx->display_list = display;
1170 ctx->display_list_size++;
1172 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1175 while (tmp_display_list) {
1176 display = tmp_display_list;
1178 tmp_display_list = display->next;
1187 static void save_display_set(DVBSubContext *ctx)
1189 DVBSubRegion *region;
1190 DVBSubRegionDisplay *display;
1192 uint32_t *clut_table;
1193 int x_pos, y_pos, width, height;
1194 int x, y, y_off, x_off;
1197 static int fileno_index = 0;
1204 for (display = ctx->display_list; display; display = display->next) {
1205 region = get_region(ctx, display->region_id);
1208 x_pos = display->x_pos;
1209 y_pos = display->y_pos;
1210 width = region->width;
1211 height = region->height;
1213 if (display->x_pos < x_pos) {
1214 width += (x_pos - display->x_pos);
1215 x_pos = display->x_pos;
1218 if (display->y_pos < y_pos) {
1219 height += (y_pos - display->y_pos);
1220 y_pos = display->y_pos;
1223 if (display->x_pos + region->width > x_pos + width) {
1224 width = display->x_pos + region->width - x_pos;
1227 if (display->y_pos + region->height > y_pos + height) {
1228 height = display->y_pos + region->height - y_pos;
1235 pbuf = av_malloc(width * height * 4);
1237 for (display = ctx->display_list; display; display = display->next) {
1238 region = get_region(ctx, display->region_id);
1240 x_off = display->x_pos - x_pos;
1241 y_off = display->y_pos - y_pos;
1243 clut = get_clut(ctx, region->clut);
1246 clut = &default_clut;
1248 switch (region->depth) {
1250 clut_table = clut->clut4;
1253 clut_table = clut->clut256;
1257 clut_table = clut->clut16;
1261 for (y = 0; y < region->height; y++) {
1262 for (x = 0; x < region->width; x++) {
1263 pbuf[((y + y_off) * width) + x_off + x] =
1264 clut_table[region->pbuf[y * region->width + x]];
1270 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1272 png_save2(filename, pbuf, width, height);
1281 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1285 DVBSubContext *ctx = avctx->priv_data;
1286 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1287 int dds_version, info_byte;
1292 info_byte = bytestream_get_byte(&buf);
1293 dds_version = info_byte >> 4;
1294 if (display_def && display_def->version == dds_version)
1295 return; // already have this display definition version
1298 display_def = av_mallocz(sizeof(*display_def));
1299 ctx->display_definition = display_def;
1304 display_def->version = dds_version;
1307 display_def->width = bytestream_get_be16(&buf) + 1;
1308 display_def->height = bytestream_get_be16(&buf) + 1;
1313 if (info_byte & 1<<3) { // display_window_flag
1314 display_def->x = bytestream_get_be16(&buf);
1315 display_def->y = bytestream_get_be16(&buf);
1316 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1317 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1321 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1322 int buf_size, AVSubtitle *sub)
1324 DVBSubContext *ctx = avctx->priv_data;
1325 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1327 DVBSubRegion *region;
1328 DVBSubRegionDisplay *display;
1329 AVSubtitleRect *rect;
1331 uint32_t *clut_table;
1333 int offset_x=0, offset_y=0;
1335 sub->end_display_time = ctx->time_out * 1000;
1338 offset_x = display_def->x;
1339 offset_y = display_def->y;
1342 sub->num_rects = ctx->display_list_size;
1344 if (sub->num_rects > 0){
1345 sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);
1346 for(i=0; i<sub->num_rects; i++)
1347 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
1352 for (display = ctx->display_list; display; display = display->next) {
1353 region = get_region(ctx, display->region_id);
1354 rect = sub->rects[i];
1359 rect->x = display->x_pos + offset_x;
1360 rect->y = display->y_pos + offset_y;
1361 rect->w = region->width;
1362 rect->h = region->height;
1363 rect->nb_colors = 16;
1364 rect->type = SUBTITLE_BITMAP;
1365 rect->pict.linesize[0] = region->width;
1367 clut = get_clut(ctx, region->clut);
1370 clut = &default_clut;
1372 switch (region->depth) {
1374 clut_table = clut->clut4;
1377 clut_table = clut->clut256;
1381 clut_table = clut->clut16;
1385 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
1386 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
1388 rect->pict.data[0] = av_malloc(region->buf_size);
1389 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
1397 save_display_set(ctx);
1403 static int dvbsub_decode(AVCodecContext *avctx,
1404 void *data, int *data_size,
1407 const uint8_t *buf = avpkt->data;
1408 int buf_size = avpkt->size;
1409 DVBSubContext *ctx = avctx->priv_data;
1410 AVSubtitle *sub = data;
1411 const uint8_t *p, *p_end;
1417 av_dlog(avctx, "DVB sub packet:\n");
1419 for (i=0; i < buf_size; i++) {
1420 av_dlog(avctx, "%02x ", buf[i]);
1422 av_dlog(avctx, "\n");
1426 av_dlog(avctx, "\n");
1428 if (buf_size <= 6 || *buf != 0x0f) {
1429 av_dlog(avctx, "incomplete or broken packet");
1434 p_end = buf + buf_size;
1436 while (p_end - p >= 6 && *p == 0x0f) {
1438 segment_type = *p++;
1439 page_id = AV_RB16(p);
1441 segment_length = AV_RB16(p);
1444 if (p_end - p < segment_length) {
1445 av_dlog(avctx, "incomplete or broken packet");
1449 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1450 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1451 switch (segment_type) {
1452 case DVBSUB_PAGE_SEGMENT:
1453 dvbsub_parse_page_segment(avctx, p, segment_length);
1455 case DVBSUB_REGION_SEGMENT:
1456 dvbsub_parse_region_segment(avctx, p, segment_length);
1458 case DVBSUB_CLUT_SEGMENT:
1459 dvbsub_parse_clut_segment(avctx, p, segment_length);
1461 case DVBSUB_OBJECT_SEGMENT:
1462 dvbsub_parse_object_segment(avctx, p, segment_length);
1464 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1465 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
1466 case DVBSUB_DISPLAY_SEGMENT:
1467 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1470 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1471 segment_type, page_id, segment_length);
1476 p += segment_length;
1483 AVCodec ff_dvbsub_decoder = {
1485 AVMEDIA_TYPE_SUBTITLE,
1486 CODEC_ID_DVB_SUBTITLE,
1487 sizeof(DVBSubContext),
1488 dvbsub_init_decoder,
1490 dvbsub_close_decoder,
1492 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),