* add tips

Author: lxowalle

components/voice/include/maix_audio.hpp

@@ -458,6 +458,7 @@ namespace maix::audio
 
         /**
          * Return the number of idle frames available for writing during playback, unit: frame. if there are no idle frames, it will cause blocking.
+         * @note MaixCAM2 dose not support this api.
          * @note The number of bytes per frame can be calculated using frame_size().
          * @return remaining frames
          * @maixpy maix.audio.Player.get_remaining_frames

components/voice/port/maixcam2/maix_audio_maixcam2.cpp

@@ -648,6 +648,7 @@ namespace maix::audio
         } else {
             log::error("get_remaining_frames failed, ret:%d", ret);
         }
+        log::warn("This function is not supported yet");
         return avail;
     }