Enable high latency audio on Android N+ for basic playback.

media/audio/android/opensles_output.cc

Index: media/audio/android/opensles_output.cc
diff --git a/media/audio/android/opensles_output.cc b/media/audio/android/opensles_output.cc
index e6062362fad53b13538d52c5031e22e860d7d951..76f6165ecd0de2093f560ac2af5e0ee5b8d1156b 100644
--- a/media/audio/android/opensles_output.cc
+++ b/media/audio/android/opensles_output.cc
@@ -4,6 +4,7 @@
 
 #include "media/audio/android/opensles_output.h"
 
+#include "base/android/build_info.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/time/time.h"
@@ -20,6 +21,26 @@
     }                                           \
   } while (0)
 
+#if !defined(SL_ANDROID_KEY_PERFORMANCE_MODE)
+/** Audio Performance mode key */
+#define SL_ANDROID_KEY_PERFORMANCE_MODE \
+  ((const SLchar*)"androidPerformanceMode")
+
+/** Audio performance values */
+/*      No specific performance requirement. Allows HW and SW pre/post
+ * processing. */
+#define SL_ANDROID_PERFORMANCE_NONE ((SLuint32)0x00000000)
+/*      Priority given to latency. No HW or software pre/post processing.
+ *      This is the default if no performance mode is specified. */
+#define SL_ANDROID_PERFORMANCE_LATENCY ((SLuint32)0x00000001)
+/*      Priority given to latency while still allowing HW pre and post
+ * processing. */
+#define SL_ANDROID_PERFORMANCE_LATENCY_EFFECTS ((SLuint32)0x00000002)
+/*      Priority given to power saving if latency is not a concern.
+ *      Allows HW and SW pre/post processing. */
+#define SL_ANDROID_PERFORMANCE_POWER_SAVING ((SLuint32)0x00000003)
+#endif
+
 namespace media {
 
 OpenSLESOutputStream::OpenSLESOutputStream(AudioManagerAndroid* manager,
@@ -38,6 +59,7 @@ OpenSLESOutputStream::OpenSLESOutputStream(AudioManagerAndroid* manager,
       muted_(false),
       volume_(1.0),
       samples_per_second_(params.sample_rate()),
+      use_high_latency_(params.latency_tag() == AudioLatency::LATENCY_PLAYBACK),
       delay_calculator_(samples_per_second_) {
   DVLOG(2) << "OpenSLESOutputStream::OpenSLESOutputStream("
            << "stream_type=" << stream_type << ")";
@@ -50,6 +72,11 @@ OpenSLESOutputStream::OpenSLESOutputStream(AudioManagerAndroid* manager,
   format_.endianness = SL_BYTEORDER_LITTLEENDIAN;
   format_.channelMask = ChannelCountToSLESChannelMask(params.channels());
   audio_bus_ = AudioBus::Create(params);
+
+  if (use_high_latency_) {
+    LOG(ERROR) << "Enabling high latency audio with buffer size: "
+               << params.frames_per_buffer();
+  }
 }
 
 OpenSLESOutputStream::~OpenSLESOutputStream() {
@@ -272,12 +299,22 @@ bool OpenSLESOutputStream::CreatePlayer() {
 
   // Set configuration using the stream type provided at construction.
   LOG_ON_FAILURE_AND_RETURN(
-      (*player_config)->SetConfiguration(player_config,
-                                         SL_ANDROID_KEY_STREAM_TYPE,
-                                         &stream_type_,
-                                         sizeof(SLint32)),
+      (*player_config)
+          ->SetConfiguration(player_config, SL_ANDROID_KEY_STREAM_TYPE,
+                             &stream_type_, sizeof(SLint32)),
       false);
 
+  // Set configuration using the stream type provided at construction.
+  if (use_high_latency_ && base::android::BuildInfo::GetInstance()->sdk_int() >=
+                               base::android::SDK_VERSION_NOUGAT) {
+    SLuint32 perf_mode = SL_ANDROID_PERFORMANCE_POWER_SAVING;
+    LOG_ON_FAILURE_AND_RETURN(
+        (*player_config)
+            ->SetConfiguration(player_config, SL_ANDROID_KEY_PERFORMANCE_MODE,
+                               &perf_mode, sizeof(SLuint32)),
+        false);
+  }
+
   // Realize the player object in synchronous mode.
   LOG_ON_FAILURE_AND_RETURN(
       player_object_->Realize(player_object_.Get(), SL_BOOLEAN_FALSE), false);