dvbsubdec.c 49 KB
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/*
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 * DVB subtitle decoding
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 * Copyright (c) 2005 Ian Caulfield
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 *
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 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * 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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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; 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 "get_bits.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "libavutil/colorspace.h"
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#include "libavutil/opt.h"
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#define DVBSUB_PAGE_SEGMENT     0x10
#define DVBSUB_REGION_SEGMENT   0x11
#define DVBSUB_CLUT_SEGMENT     0x12
#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_crop_tab + MAX_NEG_CROP)
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#ifdef DEBUG
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#if 0
static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
                     uint32_t *rgba_palette)
{
    int x, y, v;
    FILE *f;
    char fname[40], fname2[40];
    char command[1024];
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    snprintf(fname, 40, "%s.ppm", filename);

    f = fopen(fname, "w");
    if (!f) {
        perror(fname);
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        return;
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    }
    fprintf(f, "P6\n"
            "%d %d\n"
            "%d\n",
            w, h, 255);
    for(y = 0; y < h; y++) {
        for(x = 0; x < w; x++) {
            v = rgba_palette[bitmap[y * w + x]];
            putc((v >> 16) & 0xff, f);
            putc((v >> 8) & 0xff, f);
            putc((v >> 0) & 0xff, f);
        }
    }
    fclose(f);
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    snprintf(fname2, 40, "%s-a.pgm", filename);

    f = fopen(fname2, "w");
    if (!f) {
        perror(fname2);
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        return;
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    }
    fprintf(f, "P5\n"
            "%d %d\n"
            "%d\n",
            w, h, 255);
    for(y = 0; y < h; y++) {
        for(x = 0; x < w; x++) {
            v = rgba_palette[bitmap[y * w + x]];
            putc((v >> 24) & 0xff, f);
        }
    }
    fclose(f);
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    snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
    system(command);
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    snprintf(command, 1024, "rm %s %s", fname, fname2);
    system(command);
}
#endif

static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
{
    int x, y, v;
    FILE *f;
    char fname[40], fname2[40];
    char command[1024];
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    snprintf(fname, sizeof(fname), "%s.ppm", filename);
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    f = fopen(fname, "w");
    if (!f) {
        perror(fname);
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        return;
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    }
    fprintf(f, "P6\n"
            "%d %d\n"
            "%d\n",
            w, h, 255);
    for(y = 0; y < h; y++) {
        for(x = 0; x < w; x++) {
            v = bitmap[y * w + x];
            putc((v >> 16) & 0xff, f);
            putc((v >> 8) & 0xff, f);
            putc((v >> 0) & 0xff, f);
        }
    }
    fclose(f);
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    snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
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    f = fopen(fname2, "w");
    if (!f) {
        perror(fname2);
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        return;
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    }
    fprintf(f, "P5\n"
            "%d %d\n"
            "%d\n",
            w, h, 255);
    for(y = 0; y < h; y++) {
        for(x = 0; x < w; x++) {
            v = bitmap[y * w + x];
            putc((v >> 24) & 0xff, f);
        }
    }
    fclose(f);
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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);
}
#endif

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#define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
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typedef struct DVBSubCLUT {
    int id;
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    int version;
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    uint32_t clut4[4];
    uint32_t clut16[16];
    uint32_t clut256[256];
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    struct DVBSubCLUT *next;
} DVBSubCLUT;

static DVBSubCLUT default_clut;

typedef struct DVBSubObjectDisplay {
    int object_id;
    int region_id;

    int x_pos;
    int y_pos;

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    int fgcolor;
    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;

typedef struct DVBSubObject {
    int id;
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    int version;
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    int type;
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    DVBSubObjectDisplay *display_list;

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    struct DVBSubObject *next;
} DVBSubObject;

typedef struct DVBSubRegionDisplay {
    int region_id;

    int x_pos;
    int y_pos;

    struct DVBSubRegionDisplay *next;
} DVBSubRegionDisplay;

typedef struct DVBSubRegion {
    int id;
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    int version;
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    int width;
    int height;
    int depth;
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    int clut;
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    int bgcolor;
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    uint8_t *pbuf;
    int buf_size;
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    int dirty;
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    DVBSubObjectDisplay *display_list;
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    struct DVBSubRegion *next;
} DVBSubRegion;

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typedef struct DVBSubDisplayDefinition {
    int version;

    int x;
    int y;
    int width;
    int height;
} DVBSubDisplayDefinition;

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typedef struct DVBSubContext {
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    AVClass *class;
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    int composition_id;
    int ancillary_id;

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    int version;
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    int time_out;
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    int compute_edt; /**< if 1 end display time calculated using pts
                          if 0 (Default) calculated using time out */
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    int compute_clut;
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    int substream;
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    int64_t prev_start;
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    DVBSubRegion *region_list;
    DVBSubCLUT   *clut_list;
    DVBSubObject *object_list;
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    DVBSubRegionDisplay *display_list;
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    DVBSubDisplayDefinition *display_definition;
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} DVBSubContext;


static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
{
    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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    return ptr;
}

static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
{
    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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    return ptr;
}

static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
{
    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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    return ptr;
}

static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
{
    DVBSubObject *object, *obj2, **obj2_ptr;
    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) {
                *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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                        av_assert0(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_freep(&obj2);
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                }
            }
        }
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        region->display_list = display->region_list_next;
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        av_freep(&display);
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    }
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}

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static void delete_cluts(DVBSubContext *ctx)
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{
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    while (ctx->clut_list) {
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        DVBSubCLUT *clut = ctx->clut_list;
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        ctx->clut_list = clut->next;

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        av_freep(&clut);
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    }
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}
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static void delete_objects(DVBSubContext *ctx)
{
    while (ctx->object_list) {
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        DVBSubObject *object = ctx->object_list;
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        ctx->object_list = object->next;

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        av_freep(&object);
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    }
}

static void delete_regions(DVBSubContext *ctx)
{
    while (ctx->region_list) {
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        DVBSubRegion *region = ctx->region_list;
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        ctx->region_list = region->next;

        delete_region_display_list(ctx, region);

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        av_freep(&region->pbuf);
        av_freep(&region);
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    }
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}

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static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
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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 (ctx->substream < 0) {
        ctx->composition_id = -1;
        ctx->ancillary_id   = -1;
    } else if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
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        av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
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        ctx->composition_id = -1;
        ctx->ancillary_id   = -1;
    } else {
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        if (avctx->extradata_size > 5*ctx->substream + 2) {
            ctx->composition_id = AV_RB16(avctx->extradata + 5*ctx->substream);
            ctx->ancillary_id   = AV_RB16(avctx->extradata + 5*ctx->substream + 2);
        } else {
            av_log(avctx, AV_LOG_WARNING, "Selected DVB subtitles sub-stream %d is not available\n", ctx->substream);
            ctx->composition_id = AV_RB16(avctx->extradata);
            ctx->ancillary_id   = AV_RB16(avctx->extradata + 2);
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        }
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    }
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    ctx->version = -1;
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    ctx->prev_start = AV_NOPTS_VALUE;
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    default_clut.id = -1;
    default_clut.next = NULL;

    default_clut.clut4[0] = RGBA(  0,   0,   0,   0);
    default_clut.clut4[1] = RGBA(255, 255, 255, 255);
    default_clut.clut4[2] = RGBA(  0,   0,   0, 255);
    default_clut.clut4[3] = RGBA(127, 127, 127, 255);

    default_clut.clut16[0] = RGBA(  0,   0,   0,   0);
    for (i = 1; i < 16; i++) {
        if (i < 8) {
            r = (i & 1) ? 255 : 0;
            g = (i & 2) ? 255 : 0;
            b = (i & 4) ? 255 : 0;
        } else {
            r = (i & 1) ? 127 : 0;
            g = (i & 2) ? 127 : 0;
            b = (i & 4) ? 127 : 0;
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        }
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        default_clut.clut16[i] = RGBA(r, g, b, 255);
    }

    default_clut.clut256[0] = RGBA(  0,   0,   0,   0);
    for (i = 1; i < 256; i++) {
        if (i < 8) {
            r = (i & 1) ? 255 : 0;
            g = (i & 2) ? 255 : 0;
            b = (i & 4) ? 255 : 0;
            a = 63;
        } else {
            switch (i & 0x88) {
            case 0x00:
                r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
                g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
                b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
                a = 255;
                break;
            case 0x08:
                r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
                g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
                b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
                a = 127;
                break;
            case 0x80:
                r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
                g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
                b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
                a = 255;
                break;
            case 0x88:
                r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
                g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
                b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
                a = 255;
                break;
            }
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        }
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        default_clut.clut256[i] = RGBA(r, g, b, a);
    }

    return 0;
}

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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_regions(ctx);

    delete_objects(ctx);

    delete_cluts(ctx);

    av_freep(&ctx->display_definition);
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    while (ctx->display_list) {
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        display = ctx->display_list;
        ctx->display_list = display->next;
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        av_freep(&display);
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    }

    return 0;
}

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static int dvbsub_read_2bit_string(AVCodecContext *avctx,
                                   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, int x_pos)
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{
    GetBitContext gb;
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    int bits;
    int run_length;
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    int pixels_read = x_pos;
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    init_get_bits(&gb, *srcbuf, buf_size << 3);
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    destbuf += x_pos;

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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];
                else
                    *destbuf++ = bits;
            }
            pixels_read++;
        } else {
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            bits = get_bits1(&gb);
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            if (bits == 1) {
                run_length = get_bits(&gb, 3) + 3;
                bits = get_bits(&gb, 2);
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                if (non_mod == 1 && bits == 1)
                    pixels_read += run_length;
                else {
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                    if (map_table)
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                        bits = map_table[bits];
                    while (run_length-- > 0 && pixels_read < dbuf_len) {
                        *destbuf++ = bits;
                        pixels_read++;
                    }
                }
            } else {
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                bits = get_bits1(&gb);
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                if (bits == 0) {
                    bits = get_bits(&gb, 2);
                    if (bits == 2) {
                        run_length = get_bits(&gb, 4) + 12;
                        bits = get_bits(&gb, 2);

                        if (non_mod == 1 && bits == 1)
                            pixels_read += run_length;
                        else {
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                            if (map_table)
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                                bits = map_table[bits];
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
                                *destbuf++ = bits;
                                pixels_read++;
                            }
                        }
                    } else if (bits == 3) {
                        run_length = get_bits(&gb, 8) + 29;
                        bits = get_bits(&gb, 2);

                        if (non_mod == 1 && bits == 1)
                            pixels_read += run_length;
                        else {
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                            if (map_table)
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                                bits = map_table[bits];
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
                                *destbuf++ = bits;
                                pixels_read++;
                            }
                        }
                    } else if (bits == 1) {
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                        if (map_table)
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                            bits = map_table[0];
                        else
                            bits = 0;
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                        run_length = 2;
                        while (run_length-- > 0 && pixels_read < dbuf_len) {
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                            *destbuf++ = bits;
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                            pixels_read++;
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                        }
                    } else {
                        (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
                        return pixels_read;
                    }
                } else {
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                    if (map_table)
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                        bits = map_table[0];
                    else
                        bits = 0;
                    *destbuf++ = bits;
                    pixels_read++;
                }
            }
        }
    }
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    if (get_bits(&gb, 6))
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        av_log(avctx, AV_LOG_ERROR, "line overflow\n");
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    (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

    return pixels_read;
}
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static int dvbsub_read_4bit_string(AVCodecContext *avctx, 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, int x_pos)
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{
    GetBitContext gb;
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    int bits;
    int run_length;
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    int pixels_read = x_pos;
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    init_get_bits(&gb, *srcbuf, buf_size << 3);
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    destbuf += x_pos;

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    while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
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        bits = get_bits(&gb, 4);

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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];
                else
                    *destbuf++ = bits;
            }
            pixels_read++;
        } else {
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            bits = get_bits1(&gb);
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            if (bits == 0) {
                run_length = get_bits(&gb, 3);
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                if (run_length == 0) {
                    (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
                    return pixels_read;
                }
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                run_length += 2;
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                if (map_table)
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                    bits = map_table[0];
                else
                    bits = 0;
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                while (run_length-- > 0 && pixels_read < dbuf_len) {
                    *destbuf++ = bits;
                    pixels_read++;
                }
            } else {
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                bits = get_bits1(&gb);
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                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 {
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                        if (map_table)
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                            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);
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                        if (non_mod == 1 && bits == 1)
                            pixels_read += run_length;
                        else {
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                            if (map_table)
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                                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 {
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                            if (map_table)
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                                bits = map_table[bits];
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
                                *destbuf++ = bits;
                                pixels_read++;
                            }
                        }
                    } else if (bits == 1) {
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                        if (map_table)
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                            bits = map_table[0];
                        else
                            bits = 0;
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                        run_length = 2;
                        while (run_length-- > 0 && pixels_read < dbuf_len) {
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                            *destbuf++ = bits;
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                            pixels_read++;
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                        }
                    } else {
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                        if (map_table)
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                            bits = map_table[0];
                        else
                            bits = 0;
                        *destbuf++ = bits;
                        pixels_read ++;
                    }
                }
            }
        }
    }
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702
    if (get_bits(&gb, 8))
703
        av_log(avctx, AV_LOG_ERROR, "line overflow\n");
704

705 706 707 708
    (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

    return pixels_read;
}
709

710 711
static int dvbsub_read_8bit_string(AVCodecContext *avctx,
                                   uint8_t *destbuf, int dbuf_len,
Michael Niedermayer's avatar
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712
                                    const uint8_t **srcbuf, int buf_size,
713
                                    int non_mod, uint8_t *map_table, int x_pos)
714
{
Michael Niedermayer's avatar
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715
    const uint8_t *sbuf_end = (*srcbuf) + buf_size;
716 717
    int bits;
    int run_length;
718 719 720
    int pixels_read = x_pos;

    destbuf += x_pos;
721

722 723
    while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
        bits = *(*srcbuf)++;
724

725
        if (bits) {
726
            if (non_mod != 1 || bits != 1) {
727
                if (map_table)
728 729 730 731 732 733 734 735 736 737 738 739
                    *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;
                }
740

741
                bits = 0;
742 743
            } else {
                bits = *(*srcbuf)++;
744
            }
745 746 747
            if (non_mod == 1 && bits == 1)
                pixels_read += run_length;
            else {
748
                if (map_table)
749
                    bits = map_table[bits];
750 751 752 753 754 755 756
                while (run_length-- > 0 && pixels_read < dbuf_len) {
                    *destbuf++ = bits;
                    pixels_read++;
                }
            }
        }
    }
757

758
    if (*(*srcbuf)++)
759
        av_log(avctx, AV_LOG_ERROR, "line overflow\n");
760

761 762
    return pixels_read;
}
763

764
static void compute_default_clut(AVSubtitleRect *rect, int w, int h)
765 766 767 768 769 770
{
    uint8_t list[256] = {0};
    uint8_t list_inv[256];
    int counttab[256] = {0};
    int count, i, x, y;

771
#define V(x,y) rect->data[0][(x) + (y)*rect->linesize[0]]
772 773 774 775 776 777 778 779 780 781
    for (y = 0; y<h; y++) {
        for (x = 0; x<w; x++) {
            int v = V(x,y) + 1;
            int vl = x     ? V(x-1,y) + 1 : 0;
            int vr = x+1<w ? V(x+1,y) + 1 : 0;
            int vt = y     ? V(x,y-1) + 1 : 0;
            int vb = y+1<h ? V(x,y+1) + 1 : 0;
            counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
        }
    }
782
#define L(x,y) list[ rect->data[0][(x) + (y)*rect->linesize[0]] ]
783 784 785 786 787 788 789

    for (i = 0; i<256; i++) {
        int scoretab[256] = {0};
        int bestscore = 0;
        int bestv = 0;
        for (y = 0; y<h; y++) {
            for (x = 0; x<w; x++) {
790
                int v = rect->data[0][x + y*rect->linesize[0]];
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
                int l_m = list[v];
                int l_l = x     ? L(x-1, y) : 1;
                int l_r = x+1<w ? L(x+1, y) : 1;
                int l_t = y     ? L(x, y-1) : 1;
                int l_b = y+1<h ? L(x, y+1) : 1;
                int score;
                if (l_m)
                    continue;
                scoretab[v] += l_l + l_r + l_t + l_b;
                score = 1024LL*scoretab[v] / counttab[v];
                if (score > bestscore) {
                    bestscore = score;
                    bestv = v;
                }
            }
        }
        if (!bestscore)
            break;
        list    [ bestv ] = 1;
        list_inv[     i ] = bestv;
    }

813
    count = FFMAX(i - 1, 1);
814 815
    for (i--; i>=0; i--) {
        int v = i*255/count;
816
        AV_WN32(rect->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
817 818 819 820
    }
}


821
static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
822 823 824 825 826 827 828 829
{
    DVBSubContext *ctx = avctx->priv_data;
    DVBSubRegionDisplay *display;
    DVBSubDisplayDefinition *display_def = ctx->display_definition;
    DVBSubRegion *region;
    AVSubtitleRect *rect;
    DVBSubCLUT *clut;
    uint32_t *clut_table;
830
    int i;
831
    int offset_x=0, offset_y=0;
832
    int ret = 0;
833 834 835 836 837 838 839


    if (display_def) {
        offset_x = display_def->x;
        offset_y = display_def->y;
    }

840 841
    /* Not touching AVSubtitles again*/
    if(sub->num_rects) {
842
        avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
843
        return AVERROR_PATCHWELCOME;
844
    }
845 846 847 848 849 850
    for (display = ctx->display_list; display; display = display->next) {
        region = get_region(ctx, display->region_id);
        if (region && region->dirty)
            sub->num_rects++;
    }

851 852 853 854 855 856 857
    if(ctx->compute_edt == 0) {
        sub->end_display_time = ctx->time_out * 1000;
        *got_output = 1;
    } else if (ctx->prev_start != AV_NOPTS_VALUE) {
        sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
        *got_output = 1;
    }
858
    if (sub->num_rects > 0) {
859

860
        sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
861 862 863 864
        if (!sub->rects) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
865

866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886
        for(i=0; i<sub->num_rects; i++)
            sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));

        i = 0;

        for (display = ctx->display_list; display; display = display->next) {
            region = get_region(ctx, display->region_id);

            if (!region)
                continue;

            if (!region->dirty)
                continue;

            rect = sub->rects[i];
            rect->x = display->x_pos + offset_x;
            rect->y = display->y_pos + offset_y;
            rect->w = region->width;
            rect->h = region->height;
            rect->nb_colors = (1 << region->depth);
            rect->type      = SUBTITLE_BITMAP;
887
            rect->linesize[0] = region->width;
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905

            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;
            }
906

907 908
            rect->data[1] = av_mallocz(AVPALETTE_SIZE);
            if (!rect->data[1]) {
909 910
                ret = AVERROR(ENOMEM);
                goto fail;
911
            }
912
            memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
913

914 915
            rect->data[0] = av_malloc(region->buf_size);
            if (!rect->data[0]) {
916 917
                ret = AVERROR(ENOMEM);
                goto fail;
918 919
            }

920
            memcpy(rect->data[0], region->pbuf, region->buf_size);
921

922
            if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
923 924 925 926
                compute_default_clut(rect, rect->w, rect->h);

#if FF_API_AVPICTURE
FF_DISABLE_DEPRECATION_WARNINGS
927 928
{
            int j;
929 930 931 932
            for (j = 0; j < 4; j++) {
                rect->pict.data[j] = rect->data[j];
                rect->pict.linesize[j] = rect->linesize[j];
            }
933
}
934 935
FF_ENABLE_DEPRECATION_WARNINGS
#endif
936

937 938 939
            i++;
        }
    }
940 941

    return 0;
942 943 944 945 946
fail:
    if (sub->rects) {
        for(i=0; i<sub->num_rects; i++) {
            rect = sub->rects[i];
            if (rect) {
947 948
                av_freep(&rect->data[0]);
                av_freep(&rect->data[1]);
949 950 951 952 953 954 955
            }
            av_freep(&sub->rects[i]);
        }
        av_freep(&sub->rects);
    }
    sub->num_rects = 0;
    return ret;
956
}
957 958

static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
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959
                                          const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
960
{
961
    DVBSubContext *ctx = avctx->priv_data;
962 963

    DVBSubRegion *region = get_region(ctx, display->region_id);
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964
    const uint8_t *buf_end = buf + buf_size;
965 966 967
    uint8_t *pbuf;
    int x_pos, y_pos;
    int i;
968

969 970
    uint8_t map2to4[] = { 0x0,  0x7,  0x8,  0xf};
    uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
971
    uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
972 973
                         0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
    uint8_t *map_table;
974

975
#if 0
976
    ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
977
            top_bottom ? "bottom" : "top");
978

979
    for (i = 0; i < buf_size; i++) {
980
        if (i % 16 == 0)
981
            ff_dlog(avctx, "0x%8p: ", buf+i);
982

983
        ff_dlog(avctx, "%02x ", buf[i]);
984
        if (i % 16 == 15)
985
            ff_dlog(avctx, "\n");
986
    }
987

988
    if (i % 16)
989
        ff_dlog(avctx, "\n");
990
#endif
991

992
    if (!region)
993
        return;
994

995
    pbuf = region->pbuf;
996
    region->dirty = 1;
997

998 999
    x_pos = display->x_pos;
    y_pos = display->y_pos;
1000

1001
    y_pos += top_bottom;
1002 1003

    while (buf < buf_end) {
1004
        if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
1005
            av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
1006 1007
            return;
        }
1008

1009 1010 1011 1012 1013 1014 1015 1016
        switch (*buf++) {
        case 0x10:
            if (region->depth == 8)
                map_table = map2to8;
            else if (region->depth == 4)
                map_table = map2to4;
            else
                map_table = NULL;
1017

1018
            x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
1019 1020
                                            region->width, &buf, buf_end - buf,
                                            non_mod, map_table, x_pos);
1021 1022 1023 1024 1025 1026
            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;
            }
1027

1028 1029 1030 1031
            if (region->depth == 8)
                map_table = map4to8;
            else
                map_table = NULL;
1032

1033
            x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
1034 1035
                                            region->width, &buf, buf_end - buf,
                                            non_mod, map_table, x_pos);
1036 1037 1038 1039 1040 1041
            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;
            }
1042

1043
            x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
1044 1045
                                            region->width, &buf, buf_end - buf,
                                            non_mod, NULL, x_pos);
1046
            break;
1047

1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
        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;
1062

1063 1064 1065 1066 1067 1068 1069 1070
        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));
        }
    }
1071

1072 1073
}

1074 1075
static int dvbsub_parse_object_segment(AVCodecContext *avctx,
                                       const uint8_t *buf, int buf_size)
1076
{
1077
    DVBSubContext *ctx = avctx->priv_data;
1078

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1079
    const uint8_t *buf_end = buf + buf_size;
1080 1081 1082 1083
    int object_id;
    DVBSubObject *object;
    DVBSubObjectDisplay *display;
    int top_field_len, bottom_field_len;
1084

1085
    int coding_method, non_modifying_color;
1086

1087
    object_id = AV_RB16(buf);
1088
    buf += 2;
1089

1090 1091
    object = get_object(ctx, object_id);

1092
    if (!object)
1093
        return AVERROR_INVALIDDATA;
1094

1095
    coding_method = ((*buf) >> 2) & 3;
1096
    non_modifying_color = ((*buf++) >> 1) & 1;
1097

1098
    if (coding_method == 0) {
1099
        top_field_len = AV_RB16(buf);
1100
        buf += 2;
1101
        bottom_field_len = AV_RB16(buf);
1102
        buf += 2;
1103

1104
        if (buf + top_field_len + bottom_field_len > buf_end) {
1105
            av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1106
            return AVERROR_INVALIDDATA;
1107 1108
        }

1109
        for (display = object->display_list; display; display = display->object_list_next) {
1110 1111
            const uint8_t *block = buf;
            int bfl = bottom_field_len;
1112 1113

            dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1114
                                            non_modifying_color);
1115 1116 1117 1118

            if (bottom_field_len > 0)
                block = buf + top_field_len;
            else
1119
                bfl = top_field_len;
1120

1121
            dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1122
                                            non_modifying_color);
1123
        }
1124

1125
/*  } else if (coding_method == 1) {*/
1126

1127 1128 1129
    } else {
        av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
    }
1130

1131
    return 0;
1132 1133
}

1134
static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1135
                                     const uint8_t *buf, int buf_size)
1136
{
1137
    DVBSubContext *ctx = avctx->priv_data;
1138

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1139
    const uint8_t *buf_end = buf + buf_size;
1140
    int i, clut_id;
1141
    int version;
1142 1143 1144 1145 1146
    DVBSubCLUT *clut;
    int entry_id, depth , full_range;
    int y, cr, cb, alpha;
    int r, g, b, r_add, g_add, b_add;

1147
    ff_dlog(avctx, "DVB clut packet:\n");
1148

1149
    for (i=0; i < buf_size; i++) {
1150
        ff_dlog(avctx, "%02x ", buf[i]);
1151
        if (i % 16 == 15)
1152
            ff_dlog(avctx, "\n");
1153
    }
1154

1155
    if (i % 16)
1156
        ff_dlog(avctx, "\n");
1157 1158

    clut_id = *buf++;
1159
    version = ((*buf)>>4)&15;
1160
    buf += 1;
1161

1162
    clut = get_clut(ctx, clut_id);
1163

1164
    if (!clut) {
1165
        clut = av_malloc(sizeof(DVBSubCLUT));
1166 1167
        if (!clut)
            return AVERROR(ENOMEM);
1168

1169 1170 1171
        memcpy(clut, &default_clut, sizeof(DVBSubCLUT));

        clut->id = clut_id;
1172
        clut->version = -1;
1173 1174

        clut->next = ctx->clut_list;
1175 1176
        ctx->clut_list = clut;
    }
1177

1178 1179 1180 1181
    if (clut->version != version) {

    clut->version = version;

1182
    while (buf + 4 < buf_end) {
1183
        entry_id = *buf++;
1184

1185
        depth = (*buf) & 0xe0;
1186

1187 1188 1189
        if (depth == 0) {
            av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
        }
1190

1191
        full_range = (*buf++) & 1;
1192

1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
        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;
1203

1204 1205
            buf += 2;
        }
1206

1207 1208
        if (y == 0)
            alpha = 0xff;
1209

1210 1211
        YUV_TO_RGB1_CCIR(cb, cr);
        YUV_TO_RGB2_CCIR(r, g, b, y);
1212

1213
        ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1214
        if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1215
            ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1216 1217 1218
            if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
                return AVERROR_INVALIDDATA;
        }
1219

1220 1221
        if (depth & 0x80)
            clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1222
        else if (depth & 0x40)
1223
            clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1224
        else if (depth & 0x20)
1225 1226
            clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
    }
1227
    }
1228

1229
    return 0;
1230 1231 1232
}


1233
static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1234
                                       const uint8_t *buf, int buf_size)
1235
{
1236
    DVBSubContext *ctx = avctx->priv_data;
1237

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Michael Niedermayer committed
1238
    const uint8_t *buf_end = buf + buf_size;
1239
    int region_id, object_id;
1240
    int av_unused version;
1241 1242 1243 1244
    DVBSubRegion *region;
    DVBSubObject *object;
    DVBSubObjectDisplay *display;
    int fill;
1245

1246
    if (buf_size < 10)
1247
        return AVERROR_INVALIDDATA;
1248

1249
    region_id = *buf++;
1250

1251
    region = get_region(ctx, region_id);
1252

1253
    if (!region) {
1254
        region = av_mallocz(sizeof(DVBSubRegion));
1255
        if (!region)
1256
            return AVERROR(ENOMEM);
1257

1258
        region->id = region_id;
1259
        region->version = -1;
1260

1261 1262 1263
        region->next = ctx->region_list;
        ctx->region_list = region;
    }
1264

1265
    version = ((*buf)>>4) & 15;
1266
    fill = ((*buf++) >> 3) & 1;
1267

1268
    region->width = AV_RB16(buf);
1269
    buf += 2;
1270
    region->height = AV_RB16(buf);
1271
    buf += 2;
1272

1273
    if (region->width * region->height != region->buf_size) {
1274
        av_free(region->pbuf);
1275

1276
        region->buf_size = region->width * region->height;
1277

1278
        region->pbuf = av_malloc(region->buf_size);
1279 1280 1281 1282
        if (!region->pbuf) {
            region->buf_size =
            region->width =
            region->height = 0;
1283
            return AVERROR(ENOMEM);
1284
        }
1285

1286
        fill = 1;
1287
        region->dirty = 0;
1288
    }
1289

1290
    region->depth = 1 << (((*buf++) >> 2) & 7);
1291 1292 1293 1294
    if(region->depth<2 || region->depth>8){
        av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
        region->depth= 4;
    }
1295
    region->clut = *buf++;
1296

1297
    if (region->depth == 8) {
1298
        region->bgcolor = *buf++;
1299 1300
        buf += 1;
    } else {
1301
        buf += 1;
1302

1303
        if (region->depth == 4)
1304
            region->bgcolor = (((*buf++) >> 4) & 15);
1305
        else
1306
            region->bgcolor = (((*buf++) >> 2) & 3);
1307 1308
    }

1309
    ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1310 1311

    if (fill) {
1312
        memset(region->pbuf, region->bgcolor, region->buf_size);
1313
        ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1314 1315 1316 1317 1318
    }

    delete_region_display_list(ctx, region);

    while (buf + 5 < buf_end) {
1319
        object_id = AV_RB16(buf);
1320
        buf += 2;
1321

1322 1323
        object = get_object(ctx, object_id);

1324
        if (!object) {
1325
            object = av_mallocz(sizeof(DVBSubObject));
1326 1327
            if (!object)
                return AVERROR(ENOMEM);
1328

1329 1330 1331 1332
            object->id = object_id;
            object->next = ctx->object_list;
            ctx->object_list = object;
        }
1333

1334
        object->type = (*buf) >> 6;
1335

1336
        display = av_mallocz(sizeof(DVBSubObjectDisplay));
1337 1338
        if (!display)
            return AVERROR(ENOMEM);
1339

1340 1341
        display->object_id = object_id;
        display->region_id = region_id;
1342

1343
        display->x_pos = AV_RB16(buf) & 0xfff;
1344
        buf += 2;
1345
        display->y_pos = AV_RB16(buf) & 0xfff;
1346
        buf += 2;
1347

1348
        if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1349 1350
            display->fgcolor = *buf++;
            display->bgcolor = *buf++;
1351
        }
1352

1353 1354
        display->region_list_next = region->display_list;
        region->display_list = display;
1355

1356 1357 1358
        display->object_list_next = object->display_list;
        object->display_list = display;
    }
1359 1360

    return 0;
1361 1362
}

1363
static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1364
                                     const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1365
{
1366
    DVBSubContext *ctx = avctx->priv_data;
1367 1368
    DVBSubRegionDisplay *display;
    DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1369

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Michael Niedermayer committed
1370
    const uint8_t *buf_end = buf + buf_size;
1371 1372
    int region_id;
    int page_state;
1373 1374
    int timeout;
    int version;
1375

1376
    if (buf_size < 1)
1377
        return AVERROR_INVALIDDATA;
1378

1379 1380
    timeout = *buf++;
    version = ((*buf)>>4) & 15;
1381
    page_state = ((*buf++) >> 2) & 3;
1382

1383
    if (ctx->version == version) {
1384
        return 0;
1385
    }
1386 1387 1388 1389

    ctx->time_out = timeout;
    ctx->version = version;

1390
    ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1391

1392 1393 1394
    if(ctx->compute_edt == 1)
        save_subtitle_set(avctx, sub, got_output);

1395
    if (page_state == 1 || page_state == 2) {
1396 1397 1398
        delete_regions(ctx);
        delete_objects(ctx);
        delete_cluts(ctx);
1399
    }
1400

1401 1402
    tmp_display_list = ctx->display_list;
    ctx->display_list = NULL;
1403

1404 1405 1406
    while (buf + 5 < buf_end) {
        region_id = *buf++;
        buf += 1;
1407

1408 1409
        display = tmp_display_list;
        tmp_ptr = &tmp_display_list;
1410

1411
        while (display && display->region_id != region_id) {
1412 1413 1414
            tmp_ptr = &display->next;
            display = display->next;
        }
1415

1416
        if (!display) {
1417
            display = av_mallocz(sizeof(DVBSubRegionDisplay));
1418 1419 1420
            if (!display)
                return AVERROR(ENOMEM);
        }
1421

1422
        display->region_id = region_id;
1423

1424
        display->x_pos = AV_RB16(buf);
1425
        buf += 2;
1426
        display->y_pos = AV_RB16(buf);
1427
        buf += 2;
1428

1429
        *tmp_ptr = display->next;
1430

1431 1432
        display->next = ctx->display_list;
        ctx->display_list = display;
1433

1434
        ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1435
    }
1436

1437
    while (tmp_display_list) {
1438
        display = tmp_display_list;
1439

1440
        tmp_display_list = display->next;
1441

1442
        av_freep(&display);
1443
    }
1444

1445
    return 0;
1446 1447 1448
}


1449
#ifdef DEBUG
1450
static int save_display_set(DVBSubContext *ctx)
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
{
    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;
1466

1467
    for (display = ctx->display_list; display; display = display->next) {
1468
        region = get_region(ctx, display->region_id);
1469

1470
        if (!region)
1471
            return -1;
1472

1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
        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;
            }
1483

1484 1485 1486 1487
            if (display->y_pos < y_pos) {
                height += (y_pos - display->y_pos);
                y_pos = display->y_pos;
            }
1488

1489 1490 1491
            if (display->x_pos + region->width > x_pos + width) {
                width = display->x_pos + region->width - x_pos;
            }
1492

1493 1494 1495 1496 1497
            if (display->y_pos + region->height > y_pos + height) {
                height = display->y_pos + region->height - y_pos;
            }
        }
    }
1498

1499
    if (x_pos >= 0) {
1500

1501
        pbuf = av_malloc(width * height * 4);
1502
        if (!pbuf)
1503
            return -1;
1504

1505
        for (display = ctx->display_list; display; display = display->next) {
1506 1507
            region = get_region(ctx, display->region_id);

1508
            if (!region)
1509
                return -1;
1510

1511 1512 1513 1514 1515
            x_off = display->x_pos - x_pos;
            y_off = display->y_pos - y_pos;

            clut = get_clut(ctx, region->clut);

1516
            if (!clut)
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
                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;
            }
1531

1532 1533
            for (y = 0; y < region->height; y++) {
                for (x = 0; x < region->width; x++) {
1534
                    pbuf[((y + y_off) * width) + x_off + x] =
1535 1536 1537 1538
                        clut_table[region->pbuf[y * region->width + x]];
                }
            }

1539
        }
1540

1541
        snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1542 1543 1544

        png_save2(filename, pbuf, width, height);

1545
        av_freep(&pbuf);
1546
    }
1547

1548
    fileno_index++;
1549
    return 0;
1550 1551 1552
}
#endif

1553
static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1554 1555
                                                   const uint8_t *buf,
                                                   int buf_size)
1556 1557 1558 1559 1560 1561
{
    DVBSubContext *ctx = avctx->priv_data;
    DVBSubDisplayDefinition *display_def = ctx->display_definition;
    int dds_version, info_byte;

    if (buf_size < 5)
1562
        return AVERROR_INVALIDDATA;
1563 1564 1565 1566

    info_byte   = bytestream_get_byte(&buf);
    dds_version = info_byte >> 4;
    if (display_def && display_def->version == dds_version)
1567
        return 0; // already have this display definition version
1568 1569 1570

    if (!display_def) {
        display_def             = av_mallocz(sizeof(*display_def));
1571 1572
        if (!display_def)
            return AVERROR(ENOMEM);
1573 1574 1575 1576 1577 1578 1579 1580
        ctx->display_definition = display_def;
    }

    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;
1581 1582 1583 1584
    if (!avctx->width || !avctx->height) {
        avctx->width  = display_def->width;
        avctx->height = display_def->height;
    }
1585 1586

    if (info_byte & 1<<3) { // display_window_flag
1587 1588 1589
        if (buf_size < 13)
            return AVERROR_INVALIDDATA;

1590 1591
        display_def->x = bytestream_get_be16(&buf);
        display_def->width  = bytestream_get_be16(&buf) - display_def->x + 1;
1592
        display_def->y = bytestream_get_be16(&buf);
1593 1594
        display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
    }
1595 1596

    return 0;
1597 1598
}

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1599
static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1600
                                      int buf_size, AVSubtitle *sub,int *got_output)
1601
{
1602
    DVBSubContext *ctx = avctx->priv_data;
1603

1604 1605
    if(ctx->compute_edt == 0)
        save_subtitle_set(avctx, sub, got_output);
1606
#ifdef DEBUG
1607 1608
    save_display_set(ctx);
#endif
1609
    return 0;
1610 1611 1612 1613
}

static int dvbsub_decode(AVCodecContext *avctx,
                         void *data, int *data_size,
1614
                         AVPacket *avpkt)
1615
{
1616 1617
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
1618 1619
    DVBSubContext *ctx = avctx->priv_data;
    AVSubtitle *sub = data;
Michael Niedermayer's avatar
Michael Niedermayer committed
1620
    const uint8_t *p, *p_end;
1621 1622 1623 1624
    int segment_type;
    int page_id;
    int segment_length;
    int i;
1625
    int ret = 0;
1626
    int got_segment = 0;
1627
    int got_dds = 0;
1628

1629
    ff_dlog(avctx, "DVB sub packet:\n");
1630

1631
    for (i=0; i < buf_size; i++) {
1632
        ff_dlog(avctx, "%02x ", buf[i]);
1633
        if (i % 16 == 15)
1634
            ff_dlog(avctx, "\n");
1635
    }
1636

1637
    if (i % 16)
1638
        ff_dlog(avctx, "\n");
1639

1640
    if (buf_size <= 6 || *buf != 0x0f) {
1641
        ff_dlog(avctx, "incomplete or broken packet");
1642
        return AVERROR_INVALIDDATA;
1643
    }
1644

1645 1646
    p = buf;
    p_end = buf + buf_size;
1647

1648
    while (p_end - p >= 6 && *p == 0x0f) {
1649 1650
        p += 1;
        segment_type = *p++;
1651
        page_id = AV_RB16(p);
1652
        p += 2;
1653
        segment_length = AV_RB16(p);
1654
        p += 2;
1655

1656 1657 1658 1659
        if (avctx->debug & FF_DEBUG_STARTCODE) {
            av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
        }

1660
        if (p_end - p < segment_length) {
1661
            ff_dlog(avctx, "incomplete or broken packet");
1662 1663
            ret = -1;
            goto end;
1664 1665
        }

1666 1667
        if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
            ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1668
            int ret = 0;
1669 1670
            switch (segment_type) {
            case DVBSUB_PAGE_SEGMENT:
1671
                ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1672
                got_segment |= 1;
1673 1674
                break;
            case DVBSUB_REGION_SEGMENT:
1675
                ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1676
                got_segment |= 2;
1677 1678
                break;
            case DVBSUB_CLUT_SEGMENT:
1679
                ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1680
                if (ret < 0) goto end;
1681
                got_segment |= 4;
1682 1683
                break;
            case DVBSUB_OBJECT_SEGMENT:
1684
                ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1685
                got_segment |= 8;
1686
                break;
1687
            case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1688 1689
                ret = dvbsub_parse_display_definition_segment(avctx, p,
                                                              segment_length);
1690
                got_dds = 1;
1691
                break;
1692
            case DVBSUB_DISPLAY_SEGMENT:
1693
                ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1694 1695 1696 1697 1698
                if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
                    // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
                    avctx->width  = 720;
                    avctx->height = 576;
                }
1699
                got_segment |= 16;
1700 1701
                break;
            default:
1702
                ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1703 1704 1705
                        segment_type, page_id, segment_length);
                break;
            }
1706
            if (ret < 0)
1707
                goto end;
1708 1709 1710 1711
        }

        p += segment_length;
    }
1712 1713
    // Some streams do not send a display segment but if we have all the other
    // segments then we need no further data.
1714
    if (got_segment == 15) {
1715
        av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
        dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
    }

end:
    if(ret < 0) {
        *data_size = 0;
        avsubtitle_free(sub);
        return ret;
    } else {
        if(ctx->compute_edt == 1 )
            FFSWAP(int64_t, ctx->prev_start, sub->pts);
1727
    }
1728

1729
    return p - buf;
1730 1731
}

1732
#define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1733
static const AVOption options[] = {
1734 1735
    {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
    {"compute_clut", "compute clut when not available(-1) or always(1) or never(0)", offsetof(DVBSubContext, compute_clut), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, DS},
1736
    {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1737 1738 1739 1740 1741 1742 1743 1744
    {NULL}
};
static const AVClass dvbsubdec_class = {
    .class_name = "DVB Sub Decoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};
1745

1746
AVCodec ff_dvbsub_decoder = {
1747
    .name           = "dvbsub",
1748
    .long_name      = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1749
    .type           = AVMEDIA_TYPE_SUBTITLE,
1750
    .id             = AV_CODEC_ID_DVB_SUBTITLE,
1751 1752 1753 1754
    .priv_data_size = sizeof(DVBSubContext),
    .init           = dvbsub_init_decoder,
    .close          = dvbsub_close_decoder,
    .decode         = dvbsub_decode,
1755
    .priv_class     = &dvbsubdec_class,
1756
};