command: add generic "multiply" command

Essentially works like "add".

1 files changed, 40 insertions, 0 deletions

diff --git a/mpvcore/player/command.c b/mpvcore/player/command.c
index f393318fb6..172a799c03 100644
--- a/mpvcore/player/command.c
+++ b/mpvcore/player/command.c
@@ -2379,6 +2379,29 @@ static void overlay_uninit(struct MPContext *mpctx){}
 
 #endif
 
+static int mp_property_multiply(char *property, double f, struct MPContext *mpctx)
+{
+    union m_option_value val = {0};
+    struct m_option opt = {0};
+    int r;
+
+    r = mp_property_do(property, M_PROPERTY_GET_TYPE, &opt, mpctx);
+    if (r != M_PROPERTY_OK)
+        return r;
+    assert(opt.type);
+
+    if (!opt.type->multiply)
+        return M_PROPERTY_NOT_IMPLEMENTED;
+
+    r = mp_property_do(property, M_PROPERTY_GET, &val, mpctx);
+    if (r != M_PROPERTY_OK)
+        return r;
+    opt.type->multiply(&opt, &val, f);
+    r = mp_property_do(property, M_PROPERTY_SET, &val, mpctx);
+    m_option_free(&opt, &val);
+    return r;
+}
+
 // Whether this property should react to key events generated by auto-repeat.
 static bool check_property_autorepeat(char *property,  struct MPContext *mpctx)
 {
@@ -2484,6 +2507,23 @@ void run_command(MPContext *mpctx, mp_cmd_t *cmd)
         break;
     }
 
+    case MP_CMD_MULTIPLY: {
+        char *property = cmd->args[0].v.s;
+        double f = cmd->args[1].v.d;
+        int r = mp_property_multiply(property, f, mpctx);
+
+        if (r == M_PROPERTY_OK || r == M_PROPERTY_UNAVAILABLE) {
+            show_property_osd(mpctx, property, cmd->on_osd);
+        } else if (r == M_PROPERTY_UNKNOWN) {
+            set_osd_msg(mpctx, OSD_MSG_TEXT, osdl, osd_duration,
+                        "Unknown property: '%s'", property);
+        } else if (r <= 0) {
+            set_osd_msg(mpctx, OSD_MSG_TEXT, osdl, osd_duration,
+                        "Failed to multiply property '%s' by %g", property, f);
+        }
+        break;
+    }
+
     case MP_CMD_GET_PROPERTY: {
         char *tmp;
         int r = mp_property_do(cmd->args[0].v.s, M_PROPERTY_GET_STRING,