Log warnings when extension libraries can't be used

Issue: #5788
PiperOrigin-RevId: 245440858

RELEASENOTES.md

@@ -115,6 +115,11 @@
     order when in shuffle mode.
     order when in shuffle mode.
   * Allow handling of custom commands via `registerCustomCommandReceiver`.
   * Allow handling of custom commands via `registerCustomCommandReceiver`.
   * Add ability to include an extras `Bundle` when reporting a custom error.
   * Add ability to include an extras `Bundle` when reporting a custom error.
+* LoadControl: Set minimum buffer for playbacks with video equal to maximum
+  buffer ([#2083](https://github.com/google/ExoPlayer/issues/2083)).
+* Log warnings when extension native libraries can't be used, to help with
+  diagnosing playback failures
+  ([#5788](https://github.com/google/ExoPlayer/issues/5788)).
 
 
 ### 2.9.6 ###
 ### 2.9.6 ###
 
 

extensions/ffmpeg/src/main/java/com/google/android/exoplayer2/ext/ffmpeg/FfmpegLibrary.java

@@ -19,6 +19,7 @@ import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
 import com.google.android.exoplayer2.util.LibraryLoader;
 import com.google.android.exoplayer2.util.LibraryLoader;
+import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.MimeTypes;
 
 
 /**
 /**
@@ -30,6 +31,8 @@ public final class FfmpegLibrary {
     ExoPlayerLibraryInfo.registerModule("goog.exo.ffmpeg");
     ExoPlayerLibraryInfo.registerModule("goog.exo.ffmpeg");
   }
   }
 
 
+  private static final String TAG = "FfmpegLibrary";
+
   private static final LibraryLoader LOADER =
   private static final LibraryLoader LOADER =
       new LibraryLoader("avutil", "avresample", "avcodec", "ffmpeg");
       new LibraryLoader("avutil", "avresample", "avcodec", "ffmpeg");
 
 
@@ -69,7 +72,14 @@ public final class FfmpegLibrary {
       return false;
       return false;
     }
     }
     String codecName = getCodecName(mimeType, encoding);
     String codecName = getCodecName(mimeType, encoding);
-    return codecName != null && ffmpegHasDecoder(codecName);
+    if (codecName == null) {
+      return false;
+    }
+    if (!ffmpegHasDecoder(codecName)) {
+      Log.w(TAG, "No " + codecName + " decoder available. Check the FFmpeg build configuration.");
+      return false;
+    }
+    return true;
   }
   }
 
 
   /**
   /**

library/core/src/main/java/com/google/android/exoplayer2/util/LibraryLoader.java

@@ -15,11 +15,15 @@
  */
  */
 package com.google.android.exoplayer2.util;
 package com.google.android.exoplayer2.util;
 
 
+import java.util.Arrays;
+
 /**
 /**
  * Configurable loader for native libraries.
  * Configurable loader for native libraries.
  */
  */
 public final class LibraryLoader {
 public final class LibraryLoader {
 
 
+  private static final String TAG = "LibraryLoader";
+
   private String[] nativeLibraries;
   private String[] nativeLibraries;
   private boolean loadAttempted;
   private boolean loadAttempted;
   private boolean isAvailable;
   private boolean isAvailable;
@@ -54,7 +58,9 @@ public final class LibraryLoader {
       }
       }
       isAvailable = true;
       isAvailable = true;
     } catch (UnsatisfiedLinkError exception) {
     } catch (UnsatisfiedLinkError exception) {
-      // Do nothing.
+      // Log a warning as an attempt to check for the library indicates that the app depends on an
+      // extension and generally would expect its native libraries to be available.
+      Log.w(TAG, "Failed to load " + Arrays.toString(nativeLibraries));
     }
     }
     return isAvailable;
     return isAvailable;
   }
   }