diff --git a/ndk/src/audio.rs b/ndk/src/audio.rs
index 0be6e1c3..0a8db22d 100644
--- a/ndk/src/audio.rs
+++ b/ndk/src/audio.rs
@@ -146,6 +146,12 @@ pub enum AudioFormat {
     /// <a href="https://developer.android.com/reference/android/media/AudioTrack#write(float[], int, int, int)"><code>AudioTrack#write(float[], int, int, int)</code></a>.
     #[doc(alias = "AAUDIO_FORMAT_PCM_FLOAT")]
     PCM_Float = ffi::AAUDIO_FORMAT_PCM_FLOAT as ffi::aaudio_format_t,
+    /// This format uses 32-bit integer PCM.
+    /// Typically used in high-resolution audio processing.
+    /// The maximum range of the data is -2_147_483_648 to 2_147_483_647
+    #[cfg(feature = "api-level-31")]
+    #[doc(alias = "AAUDIO_FORMAT_PCM_I32")]
+    PCM_I32 = ffi::AAUDIO_FORMAT_PCM_I32 as ffi::aaudio_format_t,
 
     #[doc(hidden)]
     #[num_enum(catch_all)]
@@ -989,6 +995,10 @@ pub struct AudioStream {
     error_callback: Option<AudioStreamErrorCallback>,
 }
 
+// AAudioStream is safe to be send, but not sync.
+// See https://developer.android.com/ndk/guides/audio/aaudio/aaudio
+unsafe impl Send for AudioStream {}
+
 impl fmt::Debug for AudioStream {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("AAudioStream")