/* * DVB subtitle decoding * Copyright (c) 2005 Ian Caulfield * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avcodec.h" #include "dsputil.h" #include "get_bits.h" #include "bytestream.h" #include "libavutil/colorspace.h" #define DVBSUB_PAGE_SEGMENT 0x10 #define DVBSUB_REGION_SEGMENT 0x11 #define DVBSUB_CLUT_SEGMENT 0x12 #define DVBSUB_OBJECT_SEGMENT 0x13 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14 #define DVBSUB_DISPLAY_SEGMENT 0x80 #define cm (ff_cropTbl + MAX_NEG_CROP) #ifdef DEBUG #undef fprintf #undef perror #if 0 static void png_save(const char *filename, uint8_t *bitmap, int w, int h, uint32_t *rgba_palette) { int x, y, v; FILE *f; char fname[40], fname2[40]; char command[1024]; snprintf(fname, 40, "%s.ppm", filename); f = fopen(fname, "w"); if (!f) { perror(fname); return; } fprintf(f, "P6\n" "%d %d\n" "%d\n", w, h, 255); for(y = 0; y < h; y++) { for(x = 0; x < w; x++) { v = rgba_palette[bitmap[y * w + x]]; putc((v >> 16) & 0xff, f); putc((v >> 8) & 0xff, f); putc((v >> 0) & 0xff, f); } } fclose(f); snprintf(fname2, 40, "%s-a.pgm", filename); f = fopen(fname2, "w"); if (!f) { perror(fname2); return; } fprintf(f, "P5\n" "%d %d\n" "%d\n", w, h, 255); for(y = 0; y < h; y++) { for(x = 0; x < w; x++) { v = rgba_palette[bitmap[y * w + x]]; putc((v >> 24) & 0xff, f); } } fclose(f); snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename); system(command); snprintf(command, 1024, "rm %s %s", fname, fname2); system(command); } #endif static void png_save2(const char *filename, uint32_t *bitmap, int w, int h) { int x, y, v; FILE *f; char fname[40], fname2[40]; char command[1024]; snprintf(fname, sizeof(fname), "%s.ppm", filename); f = fopen(fname, "w"); if (!f) { perror(fname); return; } fprintf(f, "P6\n" "%d %d\n" "%d\n", w, h, 255); for(y = 0; y < h; y++) { for(x = 0; x < w; x++) { v = bitmap[y * w + x]; putc((v >> 16) & 0xff, f); putc((v >> 8) & 0xff, f); putc((v >> 0) & 0xff, f); } } fclose(f); snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename); f = fopen(fname2, "w"); if (!f) { perror(fname2); return; } fprintf(f, "P5\n" "%d %d\n" "%d\n", w, h, 255); for(y = 0; y < h; y++) { for(x = 0; x < w; x++) { v = bitmap[y * w + x]; putc((v >> 24) & 0xff, f); } } fclose(f); snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename); system(command); snprintf(command, sizeof(command), "rm %s %s", fname, fname2); system(command); } #endif #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b)) typedef struct DVBSubCLUT { int id; int version; uint32_t clut4[4]; uint32_t clut16[16]; uint32_t clut256[256]; struct DVBSubCLUT *next; } DVBSubCLUT; static DVBSubCLUT default_clut; typedef struct DVBSubObjectDisplay { int object_id; int region_id; int x_pos; int y_pos; int fgcolor; int bgcolor; struct DVBSubObjectDisplay *region_list_next; struct DVBSubObjectDisplay *object_list_next; } DVBSubObjectDisplay; typedef struct DVBSubObject { int id; int version; int type; DVBSubObjectDisplay *display_list; struct DVBSubObject *next; } DVBSubObject; typedef struct DVBSubRegionDisplay { int region_id; int x_pos; int y_pos; struct DVBSubRegionDisplay *next; } DVBSubRegionDisplay; typedef struct DVBSubRegion { int id; int version; int width; int height; int depth; int clut; int bgcolor; uint8_t *pbuf; int buf_size; int dirty; DVBSubObjectDisplay *display_list; struct DVBSubRegion *next; } DVBSubRegion; typedef struct DVBSubDisplayDefinition { int version; int x; int y; int width; int height; } DVBSubDisplayDefinition; typedef struct DVBSubContext { int composition_id; int ancillary_id; int version; int time_out; DVBSubRegion *region_list; DVBSubCLUT *clut_list; DVBSubObject *object_list; int display_list_size; DVBSubRegionDisplay *display_list; DVBSubDisplayDefinition *display_definition; } DVBSubContext; static DVBSubObject* get_object(DVBSubContext *ctx, int object_id) { DVBSubObject *ptr = ctx->object_list; while (ptr && ptr->id != object_id) { ptr = ptr->next; } return ptr; } static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id) { DVBSubCLUT *ptr = ctx->clut_list; while (ptr && ptr->id != clut_id) { ptr = ptr->next; } return ptr; } static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id) { DVBSubRegion *ptr = ctx->region_list; while (ptr && ptr->id != region_id) { ptr = ptr->next; } return ptr; } static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region) { DVBSubObject *object, *obj2, **obj2_ptr; DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr; while (region->display_list) { display = region->display_list; object = get_object(ctx, display->object_id); if (object) { obj_disp_ptr = &object->display_list; obj_disp = *obj_disp_ptr; while (obj_disp && obj_disp != display) { obj_disp_ptr = &obj_disp->object_list_next; obj_disp = *obj_disp_ptr; } if (obj_disp) { *obj_disp_ptr = obj_disp->object_list_next; if (!object->display_list) { obj2_ptr = &ctx->object_list; obj2 = *obj2_ptr; while (obj2 != object) { assert(obj2); obj2_ptr = &obj2->next; obj2 = *obj2_ptr; } *obj2_ptr = obj2->next; av_free(obj2); } } } region->display_list = display->region_list_next; av_free(display); } } static void delete_cluts(DVBSubContext *ctx) { DVBSubCLUT *clut; while (ctx->clut_list) { clut = ctx->clut_list; ctx->clut_list = clut->next; av_free(clut); } } static void delete_objects(DVBSubContext *ctx) { DVBSubObject *object; while (ctx->object_list) { object = ctx->object_list; ctx->object_list = object->next; av_free(object); } } static void delete_regions(DVBSubContext *ctx) { DVBSubRegion *region; while (ctx->region_list) { region = ctx->region_list; ctx->region_list = region->next; delete_region_display_list(ctx, region); av_free(region->pbuf); av_free(region); } } static av_cold int dvbsub_init_decoder(AVCodecContext *avctx) { int i, r, g, b, a = 0; DVBSubContext *ctx = avctx->priv_data; if (!avctx->extradata || avctx->extradata_size != 4) { av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n"); ctx->composition_id = -1; ctx->ancillary_id = -1; } else { ctx->composition_id = AV_RB16(avctx->extradata); ctx->ancillary_id = AV_RB16(avctx->extradata + 2); } ctx->version = -1; default_clut.id = -1; default_clut.next = NULL; default_clut.clut4[0] = RGBA( 0, 0, 0, 0); default_clut.clut4[1] = RGBA(255, 255, 255, 255); default_clut.clut4[2] = RGBA( 0, 0, 0, 255); default_clut.clut4[3] = RGBA(127, 127, 127, 255); default_clut.clut16[0] = RGBA( 0, 0, 0, 0); for (i = 1; i < 16; i++) { if (i < 8) { r = (i & 1) ? 255 : 0; g = (i & 2) ? 255 : 0; b = (i & 4) ? 255 : 0; } else { r = (i & 1) ? 127 : 0; g = (i & 2) ? 127 : 0; b = (i & 4) ? 127 : 0; } default_clut.clut16[i] = RGBA(r, g, b, 255); } default_clut.clut256[0] = RGBA( 0, 0, 0, 0); for (i = 1; i < 256; i++) { if (i < 8) { r = (i & 1) ? 255 : 0; g = (i & 2) ? 255 : 0; b = (i & 4) ? 255 : 0; a = 63; } else { switch (i & 0x88) { case 0x00: r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0); g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0); b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0); a = 255; break; case 0x08: r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0); g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0); b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0); a = 127; break; case 0x80: r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0); g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0); b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0); a = 255; break; case 0x88: r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0); g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0); b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0); a = 255; break; } } default_clut.clut256[i] = RGBA(r, g, b, a); } return 0; } static av_cold int dvbsub_close_decoder(AVCodecContext *avctx) { DVBSubContext *ctx = avctx->priv_data; DVBSubRegionDisplay *display; delete_regions(ctx); delete_objects(ctx); delete_cluts(ctx); av_freep(&ctx->display_definition); while (ctx->display_list) { display = ctx->display_list; ctx->display_list = display->next; av_free(display); } return 0; } static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table, int x_pos) { GetBitContext gb; int bits; int run_length; int pixels_read = x_pos; init_get_bits(&gb, *srcbuf, buf_size << 3); destbuf += x_pos; while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) { bits = get_bits(&gb, 2); if (bits) { if (non_mod != 1 || bits != 1) { if (map_table) *destbuf++ = map_table[bits]; else *destbuf++ = bits; } pixels_read++; } else { bits = get_bits1(&gb); if (bits == 1) { run_length = get_bits(&gb, 3) + 3; bits = get_bits(&gb, 2); if (non_mod == 1 && bits == 1) pixels_read += run_length; else { if (map_table) bits = map_table[bits]; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } } else { bits = get_bits1(&gb); if (bits == 0) { bits = get_bits(&gb, 2); if (bits == 2) { run_length = get_bits(&gb, 4) + 12; bits = get_bits(&gb, 2); if (non_mod == 1 && bits == 1) pixels_read += run_length; else { if (map_table) bits = map_table[bits]; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } } else if (bits == 3) { run_length = get_bits(&gb, 8) + 29; bits = get_bits(&gb, 2); if (non_mod == 1 && bits == 1) pixels_read += run_length; else { if (map_table) bits = map_table[bits]; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } } else if (bits == 1) { if (map_table) bits = map_table[0]; else bits = 0; run_length = 2; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } else { (*srcbuf) += (get_bits_count(&gb) + 7) >> 3; return pixels_read; } } else { if (map_table) bits = map_table[0]; else bits = 0; *destbuf++ = bits; pixels_read++; } } } } if (get_bits(&gb, 6)) av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n"); (*srcbuf) += (get_bits_count(&gb) + 7) >> 3; return pixels_read; } static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table, int x_pos) { GetBitContext gb; int bits; int run_length; int pixels_read = x_pos; init_get_bits(&gb, *srcbuf, buf_size << 3); destbuf += x_pos; while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) { bits = get_bits(&gb, 4); if (bits) { if (non_mod != 1 || bits != 1) { if (map_table) *destbuf++ = map_table[bits]; else *destbuf++ = bits; } pixels_read++; } else { bits = get_bits1(&gb); if (bits == 0) { run_length = get_bits(&gb, 3); if (run_length == 0) { (*srcbuf) += (get_bits_count(&gb) + 7) >> 3; return pixels_read; } run_length += 2; if (map_table) bits = map_table[0]; else bits = 0; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } else { bits = get_bits1(&gb); if (bits == 0) { run_length = get_bits(&gb, 2) + 4; bits = get_bits(&gb, 4); if (non_mod == 1 && bits == 1) pixels_read += run_length; else { if (map_table) bits = map_table[bits]; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } } else { bits = get_bits(&gb, 2); if (bits == 2) { run_length = get_bits(&gb, 4) + 9; bits = get_bits(&gb, 4); if (non_mod == 1 && bits == 1) pixels_read += run_length; else { if (map_table) bits = map_table[bits]; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } } else if (bits == 3) { run_length = get_bits(&gb, 8) + 25; bits = get_bits(&gb, 4); if (non_mod == 1 && bits == 1) pixels_read += run_length; else { if (map_table) bits = map_table[bits]; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } } else if (bits == 1) { if (map_table) bits = map_table[0]; else bits = 0; run_length = 2; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } else { if (map_table) bits = map_table[0]; else bits = 0; *destbuf++ = bits; pixels_read ++; } } } } } if (get_bits(&gb, 8)) av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n"); (*srcbuf) += (get_bits_count(&gb) + 7) >> 3; return pixels_read; } static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table, int x_pos) { const uint8_t *sbuf_end = (*srcbuf) + buf_size; int bits; int run_length; int pixels_read = x_pos; destbuf += x_pos; while (*srcbuf < sbuf_end && pixels_read < dbuf_len) { bits = *(*srcbuf)++; if (bits) { if (non_mod != 1 || bits != 1) { if (map_table) *destbuf++ = map_table[bits]; else *destbuf++ = bits; } pixels_read++; } else { bits = *(*srcbuf)++; run_length = bits & 0x7f; if ((bits & 0x80) == 0) { if (run_length == 0) { return pixels_read; } if (map_table) bits = map_table[0]; else bits = 0; while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } else { bits = *(*srcbuf)++; if (non_mod == 1 && bits == 1) pixels_read += run_length; if (map_table) bits = map_table[bits]; else while (run_length-- > 0 && pixels_read < dbuf_len) { *destbuf++ = bits; pixels_read++; } } } } if (*(*srcbuf)++) av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n"); return pixels_read; } static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display, const uint8_t *buf, int buf_size, int top_bottom, int non_mod) { DVBSubContext *ctx = avctx->priv_data; DVBSubRegion *region = get_region(ctx, display->region_id); const uint8_t *buf_end = buf + buf_size; uint8_t *pbuf; int x_pos, y_pos; int i; uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf}; uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff}; uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}; uint8_t *map_table; #if 0 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size, top_bottom ? "bottom" : "top"); for (i = 0; i < buf_size; i++) { if (i % 16 == 0) av_dlog(avctx, "0x%8p: ", buf+i); av_dlog(avctx, "%02x ", buf[i]); if (i % 16 == 15) av_dlog(avctx, "\n"); } if (i % 16) av_dlog(avctx, "\n"); #endif if (region == 0) return; pbuf = region->pbuf; region->dirty = 1; x_pos = display->x_pos; y_pos = display->y_pos; y_pos += top_bottom; while (buf < buf_end) { if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) { av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf); return; } switch (*buf++) { case 0x10: if (region->depth == 8) map_table = map2to8; else if (region->depth == 4) map_table = map2to4; else map_table = NULL; x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width), region->width, &buf, buf_end - buf, non_mod, map_table, x_pos); break; case 0x11: if (region->depth < 4) { av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth); return; } if (region->depth == 8) map_table = map4to8; else map_table = NULL; x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width), region->width, &buf, buf_end - buf, non_mod, map_table, x_pos); break; case 0x12: if (region->depth < 8) { av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth); return; } x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width), region->width, &buf, buf_end - buf, non_mod, NULL, x_pos); break; case 0x20: map2to4[0] = (*buf) >> 4; map2to4[1] = (*buf++) & 0xf; map2to4[2] = (*buf) >> 4; map2to4[3] = (*buf++) & 0xf; break; case 0x21: for (i = 0; i < 4; i++) map2to8[i] = *buf++; break; case 0x22: for (i = 0; i < 16; i++) map4to8[i] = *buf++; break; case 0xf0: x_pos = display->x_pos; y_pos += 2; break; default: av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1)); } } } static void dvbsub_parse_object_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { DVBSubContext *ctx = avctx->priv_data; const uint8_t *buf_end = buf + buf_size; int object_id; DVBSubObject *object; DVBSubObjectDisplay *display; int top_field_len, bottom_field_len; int coding_method, non_modifying_color; object_id = AV_RB16(buf); buf += 2; object = get_object(ctx, object_id); if (!object) return; coding_method = ((*buf) >> 2) & 3; non_modifying_color = ((*buf++) >> 1) & 1; if (coding_method == 0) { top_field_len = AV_RB16(buf); buf += 2; bottom_field_len = AV_RB16(buf); buf += 2; if (buf + top_field_len + bottom_field_len > buf_end) { av_log(avctx, AV_LOG_ERROR, "Field data size too large\n"); return; } for (display = object->display_list; display; display = display->object_list_next) { const uint8_t *block = buf; int bfl = bottom_field_len; dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0, non_modifying_color); if (bottom_field_len > 0) block = buf + top_field_len; else bfl = top_field_len; dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1, non_modifying_color); } /* } else if (coding_method == 1) {*/ } else { av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method); } } static void dvbsub_parse_clut_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { DVBSubContext *ctx = avctx->priv_data; const uint8_t *buf_end = buf + buf_size; int i, clut_id; int version; DVBSubCLUT *clut; int entry_id, depth , full_range; int y, cr, cb, alpha; int r, g, b, r_add, g_add, b_add; av_dlog(avctx, "DVB clut packet:\n"); for (i=0; i < buf_size; i++) { av_dlog(avctx, "%02x ", buf[i]); if (i % 16 == 15) av_dlog(avctx, "\n"); } if (i % 16) av_dlog(avctx, "\n"); clut_id = *buf++; version = ((*buf)>>4)&15; buf += 1; clut = get_clut(ctx, clut_id); if (!clut) { clut = av_malloc(sizeof(DVBSubCLUT)); memcpy(clut, &default_clut, sizeof(DVBSubCLUT)); clut->id = clut_id; clut->version = -1; clut->next = ctx->clut_list; ctx->clut_list = clut; } if (clut->version != version) { clut->version = version; while (buf + 4 < buf_end) { entry_id = *buf++; depth = (*buf) & 0xe0; if (depth == 0) { av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf); return; } full_range = (*buf++) & 1; if (full_range) { y = *buf++; cr = *buf++; cb = *buf++; alpha = *buf++; } else { y = buf[0] & 0xfc; cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4; cb = (buf[1] << 2) & 0xf0; alpha = (buf[1] << 6) & 0xc0; buf += 2; } if (y == 0) alpha = 0xff; YUV_TO_RGB1_CCIR(cb, cr); YUV_TO_RGB2_CCIR(r, g, b, y); av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha); if (depth & 0x80) clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha); if (depth & 0x40) clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha); if (depth & 0x20) clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha); } } } static void dvbsub_parse_region_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { DVBSubContext *ctx = avctx->priv_data; const uint8_t *buf_end = buf + buf_size; int region_id, object_id; int av_unused version; DVBSubRegion *region; DVBSubObject *object; DVBSubObjectDisplay *display; int fill; if (buf_size < 10) return; region_id = *buf++; region = get_region(ctx, region_id); if (!region) { region = av_mallocz(sizeof(DVBSubRegion)); region->id = region_id; region->version = -1; region->next = ctx->region_list; ctx->region_list = region; } version = ((*buf)>>4) & 15; fill = ((*buf++) >> 3) & 1; region->width = AV_RB16(buf); buf += 2; region->height = AV_RB16(buf); buf += 2; if (region->width * region->height != region->buf_size) { av_free(region->pbuf); region->buf_size = region->width * region->height; region->pbuf = av_malloc(region->buf_size); fill = 1; region->dirty = 0; } region->depth = 1 << (((*buf++) >> 2) & 7); if(region->depth<2 || region->depth>8){ av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth); region->depth= 4; } region->clut = *buf++; if (region->depth == 8) { region->bgcolor = *buf++; buf += 1; } else { buf += 1; if (region->depth == 4) region->bgcolor = (((*buf++) >> 4) & 15); else region->bgcolor = (((*buf++) >> 2) & 3); } av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height); if (fill) { memset(region->pbuf, region->bgcolor, region->buf_size); av_dlog(avctx, "Fill region (%d)\n", region->bgcolor); } delete_region_display_list(ctx, region); while (buf + 5 < buf_end) { object_id = AV_RB16(buf); buf += 2; object = get_object(ctx, object_id); if (!object) { object = av_mallocz(sizeof(DVBSubObject)); object->id = object_id; object->next = ctx->object_list; ctx->object_list = object; } object->type = (*buf) >> 6; display = av_mallocz(sizeof(DVBSubObjectDisplay)); display->object_id = object_id; display->region_id = region_id; display->x_pos = AV_RB16(buf) & 0xfff; buf += 2; display->y_pos = AV_RB16(buf) & 0xfff; buf += 2; if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) { display->fgcolor = *buf++; display->bgcolor = *buf++; } display->region_list_next = region->display_list; region->display_list = display; display->object_list_next = object->display_list; object->display_list = display; } } static void dvbsub_parse_page_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { DVBSubContext *ctx = avctx->priv_data; DVBSubRegionDisplay *display; DVBSubRegionDisplay *tmp_display_list, **tmp_ptr; const uint8_t *buf_end = buf + buf_size; int region_id; int page_state; int timeout; int version; if (buf_size < 1) return; timeout = *buf++; version = ((*buf)>>4) & 15; page_state = ((*buf++) >> 2) & 3; if (ctx->version != version) { ctx->time_out = timeout; ctx->version = version; av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state); if (page_state == 1 || page_state == 2) { delete_regions(ctx); delete_objects(ctx); delete_cluts(ctx); } tmp_display_list = ctx->display_list; ctx->display_list = NULL; ctx->display_list_size = 0; while (buf + 5 < buf_end) { region_id = *buf++; buf += 1; display = tmp_display_list; tmp_ptr = &tmp_display_list; while (display && display->region_id != region_id) { tmp_ptr = &display->next; display = display->next; } if (!display) display = av_mallocz(sizeof(DVBSubRegionDisplay)); display->region_id = region_id; display->x_pos = AV_RB16(buf); buf += 2; display->y_pos = AV_RB16(buf); buf += 2; *tmp_ptr = display->next; display->next = ctx->display_list; ctx->display_list = display; ctx->display_list_size++; av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos); } while (tmp_display_list) { display = tmp_display_list; tmp_display_list = display->next; av_free(display); } } } #ifdef DEBUG static void save_display_set(DVBSubContext *ctx) { DVBSubRegion *region; DVBSubRegionDisplay *display; DVBSubCLUT *clut; uint32_t *clut_table; int x_pos, y_pos, width, height; int x, y, y_off, x_off; uint32_t *pbuf; char filename[32]; static int fileno_index = 0; x_pos = -1; y_pos = -1; width = 0; height = 0; for (display = ctx->display_list; display; display = display->next) { region = get_region(ctx, display->region_id); if (x_pos == -1) { x_pos = display->x_pos; y_pos = display->y_pos; width = region->width; height = region->height; } else { if (display->x_pos < x_pos) { width += (x_pos - display->x_pos); x_pos = display->x_pos; } if (display->y_pos < y_pos) { height += (y_pos - display->y_pos); y_pos = display->y_pos; } if (display->x_pos + region->width > x_pos + width) { width = display->x_pos + region->width - x_pos; } if (display->y_pos + region->height > y_pos + height) { height = display->y_pos + region->height - y_pos; } } } if (x_pos >= 0) { pbuf = av_malloc(width * height * 4); for (display = ctx->display_list; display; display = display->next) { region = get_region(ctx, display->region_id); x_off = display->x_pos - x_pos; y_off = display->y_pos - y_pos; clut = get_clut(ctx, region->clut); if (clut == 0) clut = &default_clut; switch (region->depth) { case 2: clut_table = clut->clut4; break; case 8: clut_table = clut->clut256; break; case 4: default: clut_table = clut->clut16; break; } for (y = 0; y < region->height; y++) { for (x = 0; x < region->width; x++) { pbuf[((y + y_off) * width) + x_off + x] = clut_table[region->pbuf[y * region->width + x]]; } } } snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index); png_save2(filename, pbuf, width, height); av_free(pbuf); } fileno_index++; } #endif static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { DVBSubContext *ctx = avctx->priv_data; DVBSubDisplayDefinition *display_def = ctx->display_definition; int dds_version, info_byte; if (buf_size < 5) return; info_byte = bytestream_get_byte(&buf); dds_version = info_byte >> 4; if (display_def && display_def->version == dds_version) return; // already have this display definition version if (!display_def) { display_def = av_mallocz(sizeof(*display_def)); ctx->display_definition = display_def; } if (!display_def) return; display_def->version = dds_version; display_def->x = 0; display_def->y = 0; display_def->width = bytestream_get_be16(&buf) + 1; display_def->height = bytestream_get_be16(&buf) + 1; if (!avctx->width || !avctx->height) { avctx->width = display_def->width; avctx->height = display_def->height; } if (buf_size < 13) return; if (info_byte & 1<<3) { // display_window_flag display_def->x = bytestream_get_be16(&buf); display_def->y = bytestream_get_be16(&buf); display_def->width = bytestream_get_be16(&buf) - display_def->x + 1; display_def->height = bytestream_get_be16(&buf) - display_def->y + 1; } } static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size, AVSubtitle *sub) { DVBSubContext *ctx = avctx->priv_data; DVBSubDisplayDefinition *display_def = ctx->display_definition; DVBSubRegion *region; DVBSubRegionDisplay *display; AVSubtitleRect *rect; DVBSubCLUT *clut; uint32_t *clut_table; int i; int offset_x=0, offset_y=0; sub->end_display_time = ctx->time_out * 1000; if (display_def) { offset_x = display_def->x; offset_y = display_def->y; } sub->num_rects = ctx->display_list_size; if (sub->num_rects > 0){ sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects); for(i=0; i<sub->num_rects; i++) sub->rects[i] = av_mallocz(sizeof(*sub->rects[i])); i = 0; for (display = ctx->display_list; display; display = display->next) { region = get_region(ctx, display->region_id); if (!region) continue; if (!region->dirty) continue; rect = sub->rects[i]; rect->x = display->x_pos + offset_x; rect->y = display->y_pos + offset_y; rect->w = region->width; rect->h = region->height; rect->nb_colors = (1 << region->depth); rect->type = SUBTITLE_BITMAP; rect->pict.linesize[0] = region->width; clut = get_clut(ctx, region->clut); if (!clut) clut = &default_clut; switch (region->depth) { case 2: clut_table = clut->clut4; break; case 8: clut_table = clut->clut256; break; case 4: default: clut_table = clut->clut16; break; } rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE); memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t)); rect->pict.data[0] = av_malloc(region->buf_size); memcpy(rect->pict.data[0], region->pbuf, region->buf_size); i++; } sub->num_rects = i; } #ifdef DEBUG save_display_set(ctx); #endif return 1; } static int dvbsub_decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; DVBSubContext *ctx = avctx->priv_data; AVSubtitle *sub = data; const uint8_t *p, *p_end; int segment_type; int page_id; int segment_length; int i; int got_segment = 0; av_dlog(avctx, "DVB sub packet:\n"); for (i=0; i < buf_size; i++) { av_dlog(avctx, "%02x ", buf[i]); if (i % 16 == 15) av_dlog(avctx, "\n"); } if (i % 16) av_dlog(avctx, "\n"); if (buf_size <= 6 || *buf != 0x0f) { av_dlog(avctx, "incomplete or broken packet"); return -1; } p = buf; p_end = buf + buf_size; while (p_end - p >= 6 && *p == 0x0f) { p += 1; segment_type = *p++; page_id = AV_RB16(p); p += 2; segment_length = AV_RB16(p); p += 2; if (p_end - p < segment_length) { av_dlog(avctx, "incomplete or broken packet"); return -1; } if (page_id == ctx->composition_id || page_id == ctx->ancillary_id || ctx->composition_id == -1 || ctx->ancillary_id == -1) { switch (segment_type) { case DVBSUB_PAGE_SEGMENT: dvbsub_parse_page_segment(avctx, p, segment_length); got_segment |= 1; break; case DVBSUB_REGION_SEGMENT: dvbsub_parse_region_segment(avctx, p, segment_length); got_segment |= 2; break; case DVBSUB_CLUT_SEGMENT: dvbsub_parse_clut_segment(avctx, p, segment_length); got_segment |= 4; break; case DVBSUB_OBJECT_SEGMENT: dvbsub_parse_object_segment(avctx, p, segment_length); got_segment |= 8; break; case DVBSUB_DISPLAYDEFINITION_SEGMENT: dvbsub_parse_display_definition_segment(avctx, p, segment_length); break; case DVBSUB_DISPLAY_SEGMENT: *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub); got_segment |= 16; break; default: av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n", segment_type, page_id, segment_length); break; } } p += segment_length; } // Some streams do not send a display segment but if we have all the other // segments then we need no further data. if (got_segment == 15 && sub) *data_size = dvbsub_display_end_segment(avctx, p, 0, sub); return p - buf; } AVCodec ff_dvbsub_decoder = { .name = "dvbsub", .type = AVMEDIA_TYPE_SUBTITLE, .id = AV_CODEC_ID_DVB_SUBTITLE, .priv_data_size = sizeof(DVBSubContext), .init = dvbsub_init_decoder, .close = dvbsub_close_decoder, .decode = dvbsub_decode, .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"), };