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