libass.c

VLC Player Source Code

        vlc_mutex_unlock( p_ass->p_lock );
        return;
    }

    /* Allocate the regions and draw them */
    subpicture_region_t *pp_region[i_max_region];
    subpicture_region_t **pp_region_last = &p_subpic->p_region;

    for( int i = 0; i < i_region; i++ )
    {
        subpicture_region_t *r;
        video_format_t fmt_region;

        /* */
        fmt_region = fmt;
        fmt_region.i_width =
        fmt_region.i_visible_width  = region[i].x1 - region[i].x0;
        fmt_region.i_height =
        fmt_region.i_visible_height = region[i].y1 - region[i].y0;

        pp_region[i] = r = p_subpic->pf_create_region( VLC_OBJECT(p_spu), &fmt_region );
        if( !r )
            break;
        r->i_x = region[i].x0;
        r->i_y = region[i].y0;
        r->i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_LEFT;

        /* */
        RegionDraw( r, p_img );

        /* */
        *pp_region_last = r;
        pp_region_last = &r->p_next;
    }
    vlc_mutex_unlock( p_ass->p_lock );
}

static rectangle_t r_create( int x0, int y0, int x1, int y1 )
{
    rectangle_t r = { x0, y0, x1, y1 };
    return r;
}
static rectangle_t r_img( const ass_image_t *p_img )
{
    return r_create( p_img->dst_x, p_img->dst_y, p_img->dst_x+p_img->w, p_img->dst_y+p_img->h );
}
static void r_add( rectangle_t *r, const rectangle_t *n )
{
    r->x0 = __MIN( r->x0, n->x0 );
    r->y0 = __MIN( r->y0, n->y0 );
    r->x1 = __MAX( r->x1, n->x1 );
    r->y1 = __MAX( r->y1, n->y1 );
}
static int r_surface( const rectangle_t *r )
{
    return (r->x1-r->x0) * (r->y1-r->y0);
}
static bool r_overlap( const rectangle_t *a, const rectangle_t *b, int i_dx, int i_dy )
{
    return  __MAX(a->x0-i_dx, b->x0) < __MIN( a->x1+i_dx, b->x1 ) &&
            __MAX(a->y0-i_dy, b->y0) < __MIN( a->y1+i_dy, b->y1 );
}

static int BuildRegions( spu_t *p_spu, rectangle_t *p_region, int i_max_region, ass_image_t *p_img_list, int i_width, int i_height )
{
    ass_image_t *p_tmp;
    int i_count;

    VLC_UNUSED(p_spu);

#ifdef DEBUG_REGION
    int64_t i_ck_start = mdate();
#endif

    for( p_tmp = p_img_list, i_count = 0; p_tmp != NULL; p_tmp = p_tmp->next )
        i_count++;
    if( i_count <= 0 )
        return 0;

    ass_image_t **pp_img = calloc( i_count, sizeof(*pp_img) );
    if( !pp_img )
        return 0;

    for( p_tmp = p_img_list, i_count = 0; p_tmp != NULL; p_tmp = p_tmp->next, i_count++ )
        pp_img[i_count] = p_tmp;

    /* */
    const int i_w_inc = __MAX( ( i_width + 49 ) / 50, 32 );
    const int i_h_inc = __MAX( ( i_height + 99 ) / 100, 32 );
    int i_maxh = i_w_inc;
    int i_maxw = i_h_inc;
    int i_region;
    rectangle_t region[i_max_region+1];

    i_region = 0;
    for( int i_used = 0; i_used < i_count; )
    {
        int n;
        for( n = 0; n < i_count; n++ )
        {
            if( pp_img[n] )
                break;
        }
        assert( i_region < i_max_region + 1 );
        region[i_region++] = r_img( pp_img[n] );
        pp_img[n] = NULL; i_used++;

        bool b_ok;
        do {
            b_ok = false;
            for( n = 0; n < i_count; n++ )
            {
                ass_image_t *p_img = pp_img[n];
                if( !p_img )
                    continue;
                rectangle_t r = r_img( p_img );

                int k;
                int i_best = -1;
                int i_best_s = INT_MAX;
                for( k = 0; k < i_region; k++ )
                {
                    if( !r_overlap( &region[k], &r, i_maxw, i_maxh ) )
                        continue;
                    int s = r_surface( &r );
                    if( s < i_best_s )
                    {
                        i_best_s = s;
                        i_best = k;
                    }
                }
                if( i_best >= 0 )
                {
                    r_add( &region[i_best], &r );
                    pp_img[n] = NULL; i_used++;
                    b_ok = true;
                }
            }
        } while( b_ok );

        if( i_region > i_max_region )
        {
            int i_best_i = -1;
            int i_best_j = -1;
            int i_best_ds = INT_MAX;

            /* merge best */
            for( int i = 0; i < i_region; i++ )
            {
                for( int j = i+1; j < i_region; j++ )
                {
                    rectangle_t n = region[i];
                    r_add( &n, &region[j] );
                    int ds = r_surface( &n ) - r_surface( &region[i] ) - r_surface( &region[j] );

                    if( ds < i_best_ds )
                    {
                        i_best_i = i;
                        i_best_j = j;
                        i_best_ds = ds;
                    }
                }
            }
#ifdef DEBUG_REGION
            msg_Err( p_spu, "Merging %d and %d", i_best_i, i_best_j );
#endif
            r_add( &region[i_best_i], &region[i_best_j] );

            if( i_best_j+1 < i_region )
                memmove( &region[i_best_j], &region[i_best_j+1], sizeof(*region) * ( i_region - (i_best_j+1)  ) );
            i_region--;
        }
    }

    /* */
    for( int n = 0; n < i_region; n++ )
        p_region[n] = region[n];

#ifdef DEBUG_REGION
    int64_t i_ck_time = mdate() - i_ck_start;
    msg_Err( p_spu, "ASS: %d objects merged into %d region in %d micros", i_count, i_region, (int)(i_ck_time) );
#endif

    free( pp_img );

    return i_region;
}

static void RegionDraw( subpicture_region_t *p_region, ass_image_t *p_img )
{
    const plane_t *p = &p_region->picture.p[0];
    const int i_x = p_region->i_x;
    const int i_y = p_region->i_y;
    const int i_width  = p_region->fmt.i_width;
    const int i_height = p_region->fmt.i_height;

    memset( p->p_pixels, 0x00, p->i_pitch * p->i_lines );
    for( ; p_img != NULL; p_img = p_img->next )
    {
        if( p_img->dst_x < i_x || p_img->dst_x + p_img->w > i_x + i_width ||
            p_img->dst_y < i_y || p_img->dst_y + p_img->h > i_y + i_height )
            continue;

        const int r = (p_img->color >> 24)&0xff;
        const int g = (p_img->color >> 16)&0xff;
        const int b = (p_img->color >>  8)&0xff;
        const int a = (p_img->color      )&0xff;
        int x, y;

        for( y = 0; y < p_img->h; y++ )
        {
            for( x = 0; x < p_img->w; x++ )
            {
                const int alpha = p_img->bitmap[y*p_img->stride+x];
                const int an = (255 - a) * alpha / 255;

                uint8_t *p_rgba = &p->p_pixels[(y+p_img->dst_y-i_y) * p->i_pitch + 4 * (x+p_img->dst_x-i_x)];

                /* Native endianness, but RGBA ordering */
                p_rgba[0] = ( p_rgba[0] * (255-an) + r * an ) / 255;
                p_rgba[1] = ( p_rgba[1] * (255-an) + g * an ) / 255;
                p_rgba[2] = ( p_rgba[2] * (255-an) + b * an ) / 255;
                p_rgba[3] = 255 - ( 255 - p_rgba[3] ) * ( 255 - an ) / 255;
            }
        }
    }

#ifdef DEBUG_REGION
    /* XXX Draw a box for debug */
#define P(x,y) ((uint32_t*)&p->p_pixels[(y)*p->i_pitch + 4*(x)])
    for( int y = 0; y < p->i_lines; y++ )
        *P(0,y) = *P(p->i_visible_pitch/4-1,y) = 0xff000000;
    for( int x = 0; x < p->i_visible_pitch; x++ )
        *P(x/4,0) = *P(x/4,p->i_visible_lines-1) = 0xff000000;
#undef P
#endif
}


static void SubpictureReleaseRegions( spu_t *p_spu, subpicture_t *p_subpic )
{
    while( p_subpic->p_region )
    {
        subpicture_region_t *p_region = p_subpic->p_region;
        p_subpic->p_region = p_region->p_next;
        spu_DestroyRegion( p_spu, p_region );
    }
    p_subpic->p_region = NULL;
}

/* */
static ass_handle_t *AssHandleYield( decoder_t *p_dec )
{
    vlc_mutex_t *p_lock = var_AcquireMutex( "libass" );
    if( !p_lock )
        return NULL;

    ass_handle_t *p_ass = NULL;
    ass_library_t *p_library = NULL;
    ass_renderer_t *p_renderer = NULL;
    vlc_value_t val;

    var_Create( p_dec->p_libvlc, "libass-handle", VLC_VAR_ADDRESS );
    if( var_Get( p_dec->p_libvlc, "libass-handle", &val ) )
        val.p_address = NULL;

    if( val.p_address )
    {
        p_ass = val.p_address;

        p_ass->i_refcount++;

        vlc_mutex_unlock( p_lock );
        return p_ass;
    }

    /* */
    p_ass = malloc( sizeof(*p_ass) );
    if( !p_ass )
        goto error;

    /* */
    p_ass->p_libvlc = VLC_OBJECT(p_dec->p_libvlc);
    p_ass->p_lock = p_lock;
    p_ass->i_refcount = 1;

    /* Create libass library */
    p_ass->p_library = p_library = ass_library_init();
    if( !p_library )
        goto error;

    /* load attachments */
    input_attachment_t  **pp_attachments;
    int                   i_attachments;

    if( decoder_GetInputAttachments( p_dec, &pp_attachments, &i_attachments ))
    {
        i_attachments = 0;
        pp_attachments = NULL;
    }
    for( int k = 0; k < i_attachments; k++ )
    {
        input_attachment_t *p_attach = pp_attachments[k];

        if( !strcasecmp( p_attach->psz_mime, "application/x-truetype-font" ) )
        {
            msg_Dbg( p_dec, "adding embedded font %s", p_attach->psz_name );

            ass_add_font( p_ass->p_library, p_attach->psz_name, p_attach->p_data, p_attach->i_data );
        }
        vlc_input_attachment_Delete( p_attach );
    }
    free( pp_attachments );

    char *psz_font_dir = config_GetCacheDir();
    if( !psz_font_dir )
        goto error;
    ass_set_fonts_dir( p_library, psz_font_dir );
    free( psz_font_dir );

    ass_set_extract_fonts( p_library, true );
    ass_set_style_overrides( p_library, NULL );

    /* Create the renderer */
    p_ass->p_renderer = p_renderer = ass_renderer_init( p_library );
    if( !p_renderer )
        goto error;

    ass_set_use_margins( p_renderer, false);
    //if( false )
    //    ass_set_margins( p_renderer, int t, int b, int l, int r);
    ass_set_hinting( p_renderer, ASS_HINTING_NATIVE ); // No idea
    ass_set_font_scale( p_renderer, 1.0 );
    ass_set_line_spacing( p_renderer, 0.0 );

    const char *psz_font = NULL; /* We don't ship a default font with VLC */
    const char *psz_family = "Arial"; /* Use Arial if we can't find anything more suitable */
#ifdef HAVE_FONTCONFIG
    ass_set_fonts( p_renderer, psz_font, psz_family );  // setup default font/family
#else
    /* FIXME you HAVE to give him a font if no fontconfig */
    ass_set_fonts_nofc( p_renderer, psz_font, psz_family );
#endif
    memset( &p_ass->fmt, 0, sizeof(p_ass->fmt) );

    /* */
    val.p_address = p_ass;
    var_Set( p_dec->p_libvlc, "libass-handle", val );

    /* */
    vlc_mutex_unlock( p_ass->p_lock );
    return p_ass;

error:
    if( p_renderer )
        ass_renderer_done( p_renderer );
    if( p_library )
        ass_library_done( p_library );

    free( p_ass );
    vlc_mutex_unlock( p_lock );
    return NULL;
}
static void AssHandleRelease( ass_handle_t *p_ass )
{
    vlc_mutex_lock( p_ass->p_lock );
    p_ass->i_refcount--;
    if( p_ass->i_refcount > 0 )
    {
        vlc_mutex_unlock( p_ass->p_lock );
        return;
    }

    ass_renderer_done( p_ass->p_renderer );
    ass_library_done( p_ass->p_library );

    vlc_value_t val;
    val.p_address = NULL;
    var_Set( p_ass->p_libvlc, "libass-handle", val );

    vlc_mutex_unlock( p_ass->p_lock );
    free( p_ass );
}