vd_lavc: remove hwdec-by-default special case for RPI

DOCS/interface-changes.rst

@@ -79,6 +79,9 @@ Interface changes
       instead of by integer index)
     - if `--fs` is used but `--fs-screen` is not set, mpv will now use `--screen`
       instead.
+    - change the default of --hwdec to "no" on RPI. The default used to be "mmal"
+      specifically if 'Raspberry Pi support' was enabled at configure time
+      (equivalent to --enable-rpi). Use --hwdec=mmal to get the old behavior.
  --- mpv 0.30.0 ---
     - add `--d3d11-output-format` to enable explicit selection of a D3D11
       swap chain format.

video/decode/vd_lavc.c

@@ -136,7 +136,7 @@ const struct m_sub_options vd_lavc_conf = {
         .skip_frame = AVDISCARD_DEFAULT,
         .framedrop = AVDISCARD_NONREF,
         .dr = 1,
-        .hwdec_api = HAVE_RPI ? "mmal" : "no",
+        .hwdec_api = "no",
         .hwdec_codecs = "h264,vc1,hevc,vp9",
         // Maximum number of surfaces the player wants to buffer. This number
         // might require adjustment depending on whatever the player does;