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