Merge "Add comment"
diff --git a/include/hardware/audio.h b/include/hardware/audio.h
index 01d79b2..0a917e2 100644
--- a/include/hardware/audio.h
+++ b/include/hardware/audio.h
@@ -291,7 +291,7 @@
 /**
  * return the frame size (number of bytes per sample).
  */
-static inline size_t audio_stream_frame_size(struct audio_stream *s)
+static inline size_t audio_stream_frame_size(const struct audio_stream *s)
 {
     size_t chan_samp_sz;
 
diff --git a/include/hardware/audio_policy.h b/include/hardware/audio_policy.h
index 4662f0f..6dd5fd7 100644
--- a/include/hardware/audio_policy.h
+++ b/include/hardware/audio_policy.h
@@ -215,10 +215,10 @@
 
     /* Audio effect management */
     audio_io_handle_t (*get_output_for_effect)(struct audio_policy *pol,
-                                            struct effect_descriptor_s *desc);
+                                            const struct effect_descriptor_s *desc);
 
     int (*register_effect)(struct audio_policy *pol,
-                           struct effect_descriptor_s *desc,
+                           const struct effect_descriptor_s *desc,
                            audio_io_handle_t output,
                            uint32_t strategy,
                            int session,
diff --git a/modules/audio/audio_policy.c b/modules/audio/audio_policy.c
index a44ea77..2dd3dbe 100644
--- a/modules/audio/audio_policy.c
+++ b/modules/audio/audio_policy.c
@@ -193,13 +193,13 @@
 }
 
 static audio_io_handle_t ap_get_output_for_effect(struct audio_policy *pol,
-                                            struct effect_descriptor_s *desc)
+                                            const struct effect_descriptor_s *desc)
 {
     return 0;
 }
 
 static int ap_register_effect(struct audio_policy *pol,
-                              struct effect_descriptor_s *desc,
+                              const struct effect_descriptor_s *desc,
                               audio_io_handle_t output,
                               uint32_t strategy,
                               int session,