audio: add AOCONTROL_UPDATE_MEDIA_ROLE

This is used to notify an AO about the type of media that is being
played.
Either a movie or music.

audio/out/ao.h

@@ -35,6 +35,8 @@ enum aocontrol {
     AOCONTROL_SET_MUTE,
     // Has char* as argument, which contains the desired stream title.
     AOCONTROL_UPDATE_STREAM_TITLE,
+    // Has enum aocontrol_media_role* argument, which contains the current media role
+    AOCONTROL_UPDATE_MEDIA_ROLE,
 };
 
 // If set, then the queued audio data is the last. Note that after a while, new
@@ -64,6 +66,11 @@ typedef struct ao_control_vol {
     float right;
 } ao_control_vol_t;
 
+enum aocontrol_media_role {
+    AOCONTROL_MEDIA_ROLE_MUSIC,
+    AOCONTROL_MEDIA_ROLE_MOVIE,
+};
+
 struct ao_device_desc {
     const char *name;   // symbolic name; will be set on ao->device
     const char *desc;   // verbose human readable name

player/audio.c

@@ -183,6 +183,30 @@ void update_playback_speed(struct MPContext *mpctx)
     update_speed_filters(mpctx);
 }
 
+static bool has_video_track(struct MPContext *mpctx)
+{
+    if (mpctx->vo_chain && mpctx->vo_chain->is_coverart)
+        return false;
+
+    for (int n = 0; n < mpctx->num_tracks; n++) {
+        struct track *track = mpctx->tracks[n];
+        if (track->type == STREAM_VIDEO && !track->attached_picture && !track->image)
+            return true;
+    }
+
+    return false;
+}
+
+void audio_update_media_role(struct MPContext *mpctx)
+{
+    if (!mpctx->ao)
+        return;
+
+    enum aocontrol_media_role role = has_video_track(mpctx) ?
+        AOCONTROL_MEDIA_ROLE_MOVIE : AOCONTROL_MEDIA_ROLE_MUSIC;
+    ao_control(mpctx->ao, AOCONTROL_UPDATE_MEDIA_ROLE, &role);
+}
+
 static void ao_chain_reset_state(struct ao_chain *ao_c)
 {
     ao_c->last_out_pts = MP_NOPTS_VALUE;
@@ -471,6 +495,8 @@ static int reinit_audio_filters_and_output(struct MPContext *mpctx)
 
     audio_update_volume(mpctx);
 
+    audio_update_media_role(mpctx);
+
     // Almost nonsensical hack to deal with certain format change scenarios.
     if (mpctx->audio_status == STATUS_PLAYING)
         ao_start(mpctx->ao);

player/command.c

@@ -6539,6 +6539,9 @@ static void command_event(struct MPContext *mpctx, int event, void *arg)
     }
     if (event == MP_EVENT_WIN_STATE2)
         ctx->cached_window_scale = 0;
+
+    if (event == MPV_EVENT_FILE_LOADED)
+        audio_update_media_role(mpctx);
 }
 
 void handle_command_updates(struct MPContext *mpctx)

player/core.h

@@ -487,6 +487,7 @@ int init_audio_decoder(struct MPContext *mpctx, struct track *track);
 void reinit_audio_chain_src(struct MPContext *mpctx, struct track *track);
 void audio_update_volume(struct MPContext *mpctx);
 void audio_update_balance(struct MPContext *mpctx);
+void audio_update_media_role(struct MPContext *mpctx);
 void reload_audio_output(struct MPContext *mpctx);
 void audio_start_ao(struct MPContext *mpctx);