VEX-6365: Improve memory management (#17)

Improve memory management to reduce pressure on low end devices.

JIRA: VEX-6365

README.md

@@ -386,6 +386,8 @@ maxBufferMs | number | The default maximum duration of media that the player wil
 bufferForPlaybackMs | number | The default duration of media that must be buffered for playback to start or resume following a user action such as a seek, in milliseconds.
 bufferForPlaybackAfterRebufferMs | number | The default duration of media that must be buffered for playback to resume after a rebuffer, in milliseconds. A rebuffer is defined to be caused by buffer depletion rather than a user action.
 maxHeapAllocationPercent | number | The percentage of available heap that the video can use to buffer, between 0 and 1
+minBackBufferMemoryReservePercent | number | The percentage of available app memory at which during startup the back buffer will be disabled, between 0 and 1
+minBufferMemoryReservePercent | number | The percentage of available app memory to keep in reserve that prevents buffer from using it, between 0 and 1
 
 This prop should only be set when you are setting the source, changing it after the media is loaded will cause it to be reloaded.
 

android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -113,6 +113,8 @@ class ReactExoplayerView extends FrameLayout implements
         DrmSessionEventListener {
 
     public static final double DEFAULT_MAX_HEAP_ALLOCATION_PERCENT = 1;
+    public static final double DEFAULT_MIN_BACK_BUFFER_MEMORY_RESERVE = 0;
+    public static final double DEFAULT_MIN_BUFFER_MEMORY_RESERVE = 0;
 
     private static final String TAG = "ReactExoplayerView";
 
@@ -161,7 +163,8 @@ class ReactExoplayerView extends FrameLayout implements
     private int bufferForPlaybackMs = DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_MS;
     private int bufferForPlaybackAfterRebufferMs = DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS;
     private double maxHeapAllocationPercent = ReactExoplayerView.DEFAULT_MAX_HEAP_ALLOCATION_PERCENT;
-
+    private double minBackBufferMemoryReservePercent = ReactExoplayerView.DEFAULT_MIN_BACK_BUFFER_MEMORY_RESERVE;
+    private double minBufferMemoryReservePercent = ReactExoplayerView.DEFAULT_MIN_BUFFER_MEMORY_RESERVE;
     private Handler mainHandler;
     private Timer bufferCheckTimer;
 
@@ -449,6 +452,14 @@ class ReactExoplayerView extends FrameLayout implements
             if (isHeapReached) {
                 return false;
             }
+            long usedMemory = runtime.totalMemory() - runtime.freeMemory();
+            long freeMemory = runtime.maxMemory() - usedMemory;
+            long reserveMemory = (long)minBufferMemoryReservePercent * runtime.maxMemory();
+            long bufferedMs = bufferedDurationUs / (long)1000;
+            if (reserveMemory > freeMemory && bufferedMs > 2000) {
+                // We don't have enough memory in reserve so we stop buffering to allow other components to use it instead
+                return false;
+            }
             if (runtime.freeMemory() == 0) {
                 Log.w("ExoPlayer Warning", "Free memory reached 0, forcing garbage collection");
                 runtime.gc();
@@ -1622,6 +1633,16 @@ class ReactExoplayerView extends FrameLayout implements
     }
 
     public void setBackBufferDurationMs(int backBufferDurationMs) {
+        Runtime runtime = Runtime.getRuntime();
+        long usedMemory = runtime.totalMemory() - runtime.freeMemory();
+        long freeMemory = runtime.maxMemory() - usedMemory;
+        long reserveMemory = (long)minBackBufferMemoryReservePercent * runtime.maxMemory();
+        if (reserveMemory > freeMemory) {
+            // We don't have enough memory in reserve so we will 
+            Log.w("ExoPlayer Warning", "Not enough reserve memory, setting back buffer to 0ms to reduce memory pressure!");
+            this.backBufferDurationMs = 0;
+            return;
+        }
         this.backBufferDurationMs = backBufferDurationMs;
     }
 
@@ -1679,12 +1700,14 @@ class ReactExoplayerView extends FrameLayout implements
         exoPlayerView.setHideShutterView(hideShutterView);
     }
 
-    public void setBufferConfig(int newMinBufferMs, int newMaxBufferMs, int newBufferForPlaybackMs, int newBufferForPlaybackAfterRebufferMs, double newMaxHeapAllocationPercent) {
+    public void setBufferConfig(int newMinBufferMs, int newMaxBufferMs, int newBufferForPlaybackMs, int newBufferForPlaybackAfterRebufferMs, double newMaxHeapAllocationPercent, double newMinBackBufferMemoryReservePercent, double newMinBufferMemoryReservePercent) {
         minBufferMs = newMinBufferMs;
         maxBufferMs = newMaxBufferMs;
         bufferForPlaybackMs = newBufferForPlaybackMs;
         bufferForPlaybackAfterRebufferMs = newBufferForPlaybackAfterRebufferMs;
         maxHeapAllocationPercent = newMaxHeapAllocationPercent;
+        minBackBufferMemoryReservePercent = newMinBackBufferMemoryReservePercent;
+        minBufferMemoryReservePercent = newMinBufferMemoryReservePercent;
         releasePlayer();
         initializePlayer();
     }

android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerViewManager.java

@@ -56,6 +56,8 @@ public class ReactExoplayerViewManager extends ViewGroupManager<ReactExoplayerVi
     private static final String PROP_BUFFER_CONFIG_BUFFER_FOR_PLAYBACK_MS = "bufferForPlaybackMs";
     private static final String PROP_BUFFER_CONFIG_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS = "bufferForPlaybackAfterRebufferMs";
     private static final String PROP_BUFFER_CONFIG_MAX_HEAP_ALLOCATION_PERCENT = "maxHeapAllocationPercent";
+    private static final String PROP_BUFFER_CONFIG_MIN_BACK_BUFFER_MEMORY_RESERVE_PERCENT = "minBackBufferMemoryReservePercent";
+    private static final String PROP_BUFFER_CONFIG_MIN_BUFFER_MEMORY_RESERVE_PERCENT = "minBufferMemoryReservePercent";
     private static final String PROP_PREVENTS_DISPLAY_SLEEP_DURING_VIDEO_PLAYBACK = "preventsDisplaySleepDuringVideoPlayback";
     private static final String PROP_PROGRESS_UPDATE_INTERVAL = "progressUpdateInterval";
     private static final String PROP_REPORT_BANDWIDTH = "reportBandwidth";
@@ -346,6 +348,9 @@ public class ReactExoplayerViewManager extends ViewGroupManager<ReactExoplayerVi
         int bufferForPlaybackMs = DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_MS;
         int bufferForPlaybackAfterRebufferMs = DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS;
         double maxHeapAllocationPercent = ReactExoplayerView.DEFAULT_MAX_HEAP_ALLOCATION_PERCENT;
+        double minBackBufferMemoryReservePercent = ReactExoplayerView.DEFAULT_MIN_BACK_BUFFER_MEMORY_RESERVE;
+        double minBufferMemoryReservePercent = ReactExoplayerView.DEFAULT_MIN_BUFFER_MEMORY_RESERVE;
+
         if (bufferConfig != null) {
             minBufferMs = bufferConfig.hasKey(PROP_BUFFER_CONFIG_MIN_BUFFER_MS)
                     ? bufferConfig.getInt(PROP_BUFFER_CONFIG_MIN_BUFFER_MS) : minBufferMs;
@@ -357,7 +362,11 @@ public class ReactExoplayerViewManager extends ViewGroupManager<ReactExoplayerVi
                     ? bufferConfig.getInt(PROP_BUFFER_CONFIG_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS) : bufferForPlaybackAfterRebufferMs;
             maxHeapAllocationPercent = bufferConfig.hasKey(PROP_BUFFER_CONFIG_MAX_HEAP_ALLOCATION_PERCENT)
                     ? bufferConfig.getDouble(PROP_BUFFER_CONFIG_MAX_HEAP_ALLOCATION_PERCENT) : maxHeapAllocationPercent;
-            videoView.setBufferConfig(minBufferMs, maxBufferMs, bufferForPlaybackMs, bufferForPlaybackAfterRebufferMs, maxHeapAllocationPercent);
+            minBackBufferMemoryReservePercent = bufferConfig.hasKey(PROP_BUFFER_CONFIG_MIN_BACK_BUFFER_MEMORY_RESERVE_PERCENT)
+                    ? bufferConfig.getDouble(PROP_BUFFER_CONFIG_MIN_BACK_BUFFER_MEMORY_RESERVE_PERCENT) : minBackBufferMemoryReservePercent;
+            minBufferMemoryReservePercent = bufferConfig.hasKey(PROP_BUFFER_CONFIG_MIN_BUFFER_MEMORY_RESERVE_PERCENT)
+                    ? bufferConfig.getDouble(PROP_BUFFER_CONFIG_MIN_BUFFER_MEMORY_RESERVE_PERCENT) : minBufferMemoryReservePercent;
+            videoView.setBufferConfig(minBufferMs, maxBufferMs, bufferForPlaybackMs, bufferForPlaybackAfterRebufferMs, maxHeapAllocationPercent, minBackBufferMemoryReservePercent, minBufferMemoryReservePercent);
         }
     }