git.sesse.net Git - vlc/blob - modules/codec/substext.h

   1 struct subpicture_updater_sys_t {
   2     char *text;
   3     char *html;
   4
   5     int  align;
   6     int  x;
   7     int  y;
   8     int  i_font_height_percent;
   9
  10     bool is_fixed;
  11     int  fixed_width;
  12     int  fixed_height;
  13     bool renderbg;
  14 };
  15
  16 static int SubpictureTextValidate(subpicture_t *subpic,
  17                                   bool has_src_changed, const video_format_t *fmt_src,
  18                                   bool has_dst_changed, const video_format_t *fmt_dst,
  19                                   mtime_t ts)
  20 {
  21     subpicture_updater_sys_t *sys = subpic->updater.p_sys;
  22     VLC_UNUSED(fmt_src); VLC_UNUSED(fmt_dst); VLC_UNUSED(ts);
  23
  24     if (!has_src_changed && !has_dst_changed)
  25         return VLC_SUCCESS;
  26     if (!sys->is_fixed && subpic->b_absolute && subpic->p_region &&
  27         subpic->i_original_picture_width > 0 &&
  28         subpic->i_original_picture_height > 0) {
  29
  30         sys->is_fixed     = true;
  31         sys->x            = subpic->p_region->i_x;
  32         sys->y            = subpic->p_region->i_y;
  33         sys->fixed_width  = subpic->i_original_picture_width;
  34         sys->fixed_height = subpic->i_original_picture_height;
  35     }
  36     return VLC_EGENERIC;
  37 }
  38 static void SubpictureTextUpdate(subpicture_t *subpic,
  39                                  const video_format_t *fmt_src,
  40                                  const video_format_t *fmt_dst,
  41                                  mtime_t ts)
  42 {
  43     subpicture_updater_sys_t *sys = subpic->updater.p_sys;
  44     VLC_UNUSED(fmt_src); VLC_UNUSED(ts);
  45
  46     if (fmt_dst->i_sar_num <= 0 || fmt_dst->i_sar_den <= 0)
  47         return;
  48
  49     subpic->i_original_picture_width  = fmt_dst->i_width * fmt_dst->i_sar_num / fmt_dst->i_sar_den;
  50     subpic->i_original_picture_height = fmt_dst->i_height;
  51
  52     video_format_t fmt;
  53     video_format_Init(&fmt, VLC_CODEC_TEXT);
  54     fmt.i_sar_num = 1;
  55     fmt.i_sar_den = 1;
  56
  57     subpicture_region_t *r = subpic->p_region = subpicture_region_New(&fmt);
  58     if (!r)
  59         return;
  60
  61     r->psz_text = sys->text ? strdup(sys->text) : NULL;
  62     r->psz_html = sys->html ? strdup(sys->html) : NULL;
  63     r->i_align  = sys->align;
  64     r->b_renderbg = sys->renderbg;
  65     if (!sys->is_fixed) {
  66         const float margin_ratio = 0.04;
  67         const int   margin_h     = margin_ratio * fmt_dst->i_visible_width;
  68         const int   margin_v     = margin_ratio * fmt_dst->i_visible_height;
  69
  70         r->i_x = 0;
  71         if (r->i_align & SUBPICTURE_ALIGN_LEFT)
  72             r->i_x += margin_h + fmt_dst->i_x_offset;
  73         else if (r->i_align & SUBPICTURE_ALIGN_RIGHT)
  74             r->i_x += margin_h + fmt_dst->i_width - (fmt_dst->i_visible_width + fmt_dst->i_x_offset);
  75
  76         r->i_y = 0;
  77         if (r->i_align & SUBPICTURE_ALIGN_TOP )
  78             r->i_y += margin_v + fmt_dst->i_y_offset;
  79         else if (r->i_align & SUBPICTURE_ALIGN_BOTTOM )
  80             r->i_y += margin_v + fmt_dst->i_height - (fmt_dst->i_visible_height + fmt_dst->i_y_offset);
  81     } else {
  82         /* FIXME it doesn't adapt on crop settings changes */
  83         r->i_x = sys->x * fmt_dst->i_width  / sys->fixed_width;
  84         r->i_y = sys->y * fmt_dst->i_height / sys->fixed_height;
  85     }
  86
  87     if (sys->i_font_height_percent != 0)
  88     {
  89         r->p_style = text_style_New();
  90         if (r->p_style)
  91         {
  92             r->p_style->i_font_size = sys->i_font_height_percent *
  93               subpic->i_original_picture_height / 100;
  94             r->p_style->i_font_color = 0xffffff;
  95             r->p_style->i_font_alpha = 0xff;
  96         }
  97     }
  98 }
  99 static void SubpictureTextDestroy(subpicture_t *subpic)
 100 {
 101     subpicture_updater_sys_t *sys = subpic->updater.p_sys;
 102
 103     free(sys->text);
 104     free(sys->html);
 105     free(sys);
 106 }
 107
 108 static inline subpicture_t *decoder_NewSubpictureText(decoder_t *decoder)
 109 {
 110     subpicture_updater_sys_t *sys = calloc(1, sizeof(*sys));
 111     subpicture_updater_t updater = {
 112         .pf_validate = SubpictureTextValidate,
 113         .pf_update   = SubpictureTextUpdate,
 114         .pf_destroy  = SubpictureTextDestroy,
 115         .p_sys       = sys,
 116     };
 117     subpicture_t *subpic = decoder_NewSubpicture(decoder, &updater);
 118     if (!subpic)
 119         free(sys);
 120     return subpic;
 121 }