1476 lines
40 KiB
C
1476 lines
40 KiB
C
/*
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* DVB subtitle decoding for ffmpeg
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* Copyright (c) 2005 Ian Caulfield
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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#include "get_bits.h"
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#include "bytestream.h"
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#include "libavutil/colorspace.h"
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#define DVBSUB_PAGE_SEGMENT 0x10
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#define DVBSUB_REGION_SEGMENT 0x11
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#define DVBSUB_CLUT_SEGMENT 0x12
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#define DVBSUB_OBJECT_SEGMENT 0x13
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#define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
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#define DVBSUB_DISPLAY_SEGMENT 0x80
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#define cm (ff_cropTbl + MAX_NEG_CROP)
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#ifdef DEBUG
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#undef fprintf
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#undef perror
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#if 0
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static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
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uint32_t *rgba_palette)
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{
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int x, y, v;
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FILE *f;
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char fname[40], fname2[40];
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char command[1024];
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snprintf(fname, 40, "%s.ppm", filename);
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f = fopen(fname, "w");
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if (!f) {
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perror(fname);
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return;
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}
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fprintf(f, "P6\n"
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"%d %d\n"
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"%d\n",
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w, h, 255);
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for(y = 0; y < h; y++) {
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for(x = 0; x < w; x++) {
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v = rgba_palette[bitmap[y * w + x]];
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putc((v >> 16) & 0xff, f);
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putc((v >> 8) & 0xff, f);
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putc((v >> 0) & 0xff, f);
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}
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}
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fclose(f);
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snprintf(fname2, 40, "%s-a.pgm", filename);
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f = fopen(fname2, "w");
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if (!f) {
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perror(fname2);
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return;
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}
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fprintf(f, "P5\n"
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"%d %d\n"
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"%d\n",
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w, h, 255);
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for(y = 0; y < h; y++) {
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for(x = 0; x < w; x++) {
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v = rgba_palette[bitmap[y * w + x]];
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putc((v >> 24) & 0xff, f);
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}
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}
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fclose(f);
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snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
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system(command);
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snprintf(command, 1024, "rm %s %s", fname, fname2);
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system(command);
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}
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#endif
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static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
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{
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int x, y, v;
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FILE *f;
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char fname[40], fname2[40];
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char command[1024];
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snprintf(fname, sizeof(fname), "%s.ppm", filename);
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f = fopen(fname, "w");
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if (!f) {
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perror(fname);
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return;
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}
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fprintf(f, "P6\n"
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"%d %d\n"
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"%d\n",
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w, h, 255);
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for(y = 0; y < h; y++) {
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for(x = 0; x < w; x++) {
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v = bitmap[y * w + x];
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putc((v >> 16) & 0xff, f);
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putc((v >> 8) & 0xff, f);
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putc((v >> 0) & 0xff, f);
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}
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}
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fclose(f);
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snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
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f = fopen(fname2, "w");
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if (!f) {
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perror(fname2);
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return;
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}
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fprintf(f, "P5\n"
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"%d %d\n"
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"%d\n",
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w, h, 255);
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for(y = 0; y < h; y++) {
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for(x = 0; x < w; x++) {
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v = bitmap[y * w + x];
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putc((v >> 24) & 0xff, f);
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}
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}
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fclose(f);
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snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
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system(command);
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snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
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system(command);
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}
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#endif
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#define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
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typedef struct DVBSubCLUT {
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int id;
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uint32_t clut4[4];
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uint32_t clut16[16];
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uint32_t clut256[256];
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struct DVBSubCLUT *next;
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} DVBSubCLUT;
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static DVBSubCLUT default_clut;
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typedef struct DVBSubObjectDisplay {
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int object_id;
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int region_id;
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int x_pos;
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int y_pos;
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int fgcolor;
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int bgcolor;
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struct DVBSubObjectDisplay *region_list_next;
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struct DVBSubObjectDisplay *object_list_next;
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} DVBSubObjectDisplay;
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typedef struct DVBSubObject {
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int id;
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int type;
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DVBSubObjectDisplay *display_list;
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struct DVBSubObject *next;
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} DVBSubObject;
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typedef struct DVBSubRegionDisplay {
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int region_id;
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int x_pos;
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int y_pos;
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struct DVBSubRegionDisplay *next;
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} DVBSubRegionDisplay;
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typedef struct DVBSubRegion {
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int id;
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int width;
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int height;
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int depth;
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int clut;
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int bgcolor;
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uint8_t *pbuf;
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int buf_size;
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DVBSubObjectDisplay *display_list;
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struct DVBSubRegion *next;
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} DVBSubRegion;
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typedef struct DVBSubDisplayDefinition {
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int version;
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int x;
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int y;
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int width;
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int height;
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} DVBSubDisplayDefinition;
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typedef struct DVBSubContext {
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int composition_id;
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int ancillary_id;
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int time_out;
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DVBSubRegion *region_list;
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DVBSubCLUT *clut_list;
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DVBSubObject *object_list;
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int display_list_size;
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DVBSubRegionDisplay *display_list;
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DVBSubDisplayDefinition *display_definition;
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} DVBSubContext;
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static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
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{
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DVBSubObject *ptr = ctx->object_list;
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while (ptr && ptr->id != object_id) {
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ptr = ptr->next;
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}
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return ptr;
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}
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static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
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{
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DVBSubCLUT *ptr = ctx->clut_list;
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while (ptr && ptr->id != clut_id) {
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ptr = ptr->next;
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}
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return ptr;
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}
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static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
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{
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DVBSubRegion *ptr = ctx->region_list;
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while (ptr && ptr->id != region_id) {
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ptr = ptr->next;
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}
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return ptr;
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}
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static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
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{
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DVBSubObject *object, *obj2, **obj2_ptr;
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DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
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while (region->display_list) {
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display = region->display_list;
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object = get_object(ctx, display->object_id);
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if (object) {
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obj_disp_ptr = &object->display_list;
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obj_disp = *obj_disp_ptr;
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while (obj_disp && obj_disp != display) {
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obj_disp_ptr = &obj_disp->object_list_next;
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obj_disp = *obj_disp_ptr;
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}
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if (obj_disp) {
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*obj_disp_ptr = obj_disp->object_list_next;
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if (!object->display_list) {
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obj2_ptr = &ctx->object_list;
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obj2 = *obj2_ptr;
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while (obj2 != object) {
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assert(obj2);
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obj2_ptr = &obj2->next;
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obj2 = *obj2_ptr;
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}
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*obj2_ptr = obj2->next;
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av_free(obj2);
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}
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}
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}
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region->display_list = display->region_list_next;
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av_free(display);
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}
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}
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static void delete_state(DVBSubContext *ctx)
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{
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DVBSubRegion *region;
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DVBSubCLUT *clut;
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while (ctx->region_list) {
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region = ctx->region_list;
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ctx->region_list = region->next;
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delete_region_display_list(ctx, region);
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av_free(region->pbuf);
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av_free(region);
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}
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while (ctx->clut_list) {
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clut = ctx->clut_list;
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ctx->clut_list = clut->next;
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av_free(clut);
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}
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av_freep(&ctx->display_definition);
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/* Should already be null */
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if (ctx->object_list)
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av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");
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}
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static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
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{
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int i, r, g, b, a = 0;
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DVBSubContext *ctx = avctx->priv_data;
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if (!avctx->extradata || avctx->extradata_size != 4) {
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av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
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ctx->composition_id = -1;
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ctx->ancillary_id = -1;
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} else {
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ctx->composition_id = AV_RB16(avctx->extradata);
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ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
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}
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default_clut.id = -1;
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default_clut.next = NULL;
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default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
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default_clut.clut4[1] = RGBA(255, 255, 255, 255);
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default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
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default_clut.clut4[3] = RGBA(127, 127, 127, 255);
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default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
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for (i = 1; i < 16; i++) {
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if (i < 8) {
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r = (i & 1) ? 255 : 0;
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g = (i & 2) ? 255 : 0;
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b = (i & 4) ? 255 : 0;
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} else {
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r = (i & 1) ? 127 : 0;
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g = (i & 2) ? 127 : 0;
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b = (i & 4) ? 127 : 0;
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}
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default_clut.clut16[i] = RGBA(r, g, b, 255);
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}
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default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
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for (i = 1; i < 256; i++) {
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if (i < 8) {
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r = (i & 1) ? 255 : 0;
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g = (i & 2) ? 255 : 0;
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b = (i & 4) ? 255 : 0;
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a = 63;
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} else {
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switch (i & 0x88) {
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case 0x00:
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r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
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g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
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b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
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a = 255;
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break;
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case 0x08:
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r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
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g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
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b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
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a = 127;
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break;
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case 0x80:
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r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
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g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
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b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
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a = 255;
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break;
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case 0x88:
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r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
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g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
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b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
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a = 255;
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break;
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}
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}
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default_clut.clut256[i] = RGBA(r, g, b, a);
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}
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return 0;
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}
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static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
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{
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DVBSubContext *ctx = avctx->priv_data;
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DVBSubRegionDisplay *display;
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delete_state(ctx);
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while (ctx->display_list) {
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display = ctx->display_list;
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ctx->display_list = display->next;
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av_free(display);
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}
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return 0;
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}
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static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
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const uint8_t **srcbuf, int buf_size,
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int non_mod, uint8_t *map_table)
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{
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GetBitContext gb;
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int bits;
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int run_length;
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int pixels_read = 0;
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init_get_bits(&gb, *srcbuf, buf_size << 3);
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while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
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bits = get_bits(&gb, 2);
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if (bits) {
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if (non_mod != 1 || bits != 1) {
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if (map_table)
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*destbuf++ = map_table[bits];
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else
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*destbuf++ = bits;
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}
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pixels_read++;
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} else {
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bits = get_bits1(&gb);
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if (bits == 1) {
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run_length = get_bits(&gb, 3) + 3;
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bits = get_bits(&gb, 2);
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if (non_mod == 1 && bits == 1)
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pixels_read += run_length;
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else {
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if (map_table)
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bits = map_table[bits];
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while (run_length-- > 0 && pixels_read < dbuf_len) {
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*destbuf++ = bits;
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pixels_read++;
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}
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}
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} else {
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bits = get_bits1(&gb);
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if (bits == 0) {
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bits = get_bits(&gb, 2);
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if (bits == 2) {
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run_length = get_bits(&gb, 4) + 12;
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bits = get_bits(&gb, 2);
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if (non_mod == 1 && bits == 1)
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pixels_read += run_length;
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else {
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if (map_table)
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bits = map_table[bits];
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while (run_length-- > 0 && pixels_read < dbuf_len) {
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*destbuf++ = bits;
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pixels_read++;
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}
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}
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} else if (bits == 3) {
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run_length = get_bits(&gb, 8) + 29;
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bits = get_bits(&gb, 2);
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if (non_mod == 1 && bits == 1)
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pixels_read += run_length;
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else {
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if (map_table)
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bits = map_table[bits];
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while (run_length-- > 0 && pixels_read < dbuf_len) {
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*destbuf++ = bits;
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pixels_read++;
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}
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}
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} else if (bits == 1) {
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pixels_read += 2;
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if (map_table)
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bits = map_table[0];
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else
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bits = 0;
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if (pixels_read <= dbuf_len) {
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*destbuf++ = bits;
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*destbuf++ = bits;
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}
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} else {
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(*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
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return pixels_read;
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}
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} else {
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if (map_table)
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bits = map_table[0];
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else
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bits = 0;
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*destbuf++ = bits;
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pixels_read++;
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}
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}
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}
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}
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if (get_bits(&gb, 6))
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av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
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(*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
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return pixels_read;
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}
|
|
|
|
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)
|
|
{
|
|
GetBitContext gb;
|
|
|
|
int bits;
|
|
int run_length;
|
|
int pixels_read = 0;
|
|
|
|
init_get_bits(&gb, *srcbuf, buf_size << 3);
|
|
|
|
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) {
|
|
pixels_read += 2;
|
|
if (map_table)
|
|
bits = map_table[0];
|
|
else
|
|
bits = 0;
|
|
if (pixels_read <= dbuf_len) {
|
|
*destbuf++ = bits;
|
|
*destbuf++ = bits;
|
|
}
|
|
} 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)
|
|
{
|
|
const uint8_t *sbuf_end = (*srcbuf) + buf_size;
|
|
int bits;
|
|
int run_length;
|
|
int pixels_read = 0;
|
|
|
|
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;
|
|
|
|
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");
|
|
|
|
if (region == 0)
|
|
return;
|
|
|
|
pbuf = region->pbuf;
|
|
|
|
x_pos = display->x_pos;
|
|
y_pos = display->y_pos;
|
|
|
|
if ((y_pos & 1) != top_bottom)
|
|
y_pos++;
|
|
|
|
while (buf < buf_end) {
|
|
if (x_pos > region->width || y_pos > region->height) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
|
|
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) + x_pos,
|
|
region->width - x_pos, &buf, buf_end - buf,
|
|
non_mod, map_table);
|
|
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) + x_pos,
|
|
region->width - x_pos, &buf, buf_end - buf,
|
|
non_mod, map_table);
|
|
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) + x_pos,
|
|
region->width - x_pos, &buf, buf_end - buf,
|
|
non_mod, NULL);
|
|
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;
|
|
const uint8_t *block;
|
|
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) {
|
|
block = buf;
|
|
|
|
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
|
|
bottom_field_len = top_field_len;
|
|
|
|
dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 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;
|
|
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++;
|
|
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->next = ctx->clut_list;
|
|
ctx->clut_list = clut;
|
|
}
|
|
|
|
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;
|
|
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->next = ctx->region_list;
|
|
ctx->region_list = region;
|
|
}
|
|
|
|
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->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++;
|
|
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;
|
|
|
|
if (buf_size < 1)
|
|
return;
|
|
|
|
ctx->time_out = *buf++;
|
|
page_state = ((*buf++) >> 2) & 3;
|
|
|
|
av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
|
|
|
|
if (page_state == 2) {
|
|
delete_state(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 (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->rects = NULL;
|
|
sub->start_display_time = 0;
|
|
sub->end_display_time = ctx->time_out * 1000;
|
|
sub->format = 0;
|
|
|
|
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);
|
|
rect = sub->rects[i];
|
|
|
|
if (!region)
|
|
continue;
|
|
|
|
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 = 16;
|
|
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;
|
|
|
|
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);
|
|
break;
|
|
case DVBSUB_REGION_SEGMENT:
|
|
dvbsub_parse_region_segment(avctx, p, segment_length);
|
|
break;
|
|
case DVBSUB_CLUT_SEGMENT:
|
|
dvbsub_parse_clut_segment(avctx, p, segment_length);
|
|
break;
|
|
case DVBSUB_OBJECT_SEGMENT:
|
|
dvbsub_parse_object_segment(avctx, p, segment_length);
|
|
break;
|
|
case DVBSUB_DISPLAYDEFINITION_SEGMENT:
|
|
dvbsub_parse_display_definition_segment(avctx, p, segment_length);
|
|
case DVBSUB_DISPLAY_SEGMENT:
|
|
*data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
|
|
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;
|
|
}
|
|
|
|
return p - buf;
|
|
}
|
|
|
|
|
|
AVCodec ff_dvbsub_decoder = {
|
|
.name = "dvbsub",
|
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
|
.id = 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"),
|
|
};
|