Add Create() function to AudioCodecBridge and VideoCodecBridge to allow return of null pointers

media/base/android/media_codec_bridge.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_ANDROID_MEDIA_CODEC_BRIDGE_H_
 #define MEDIA_BASE_ANDROID_MEDIA_CODEC_BRIDGE_H_
 
 #include <jni.h>
 #include <string>
 
@@ skipping 67 matching lines @@
       base::TimeDelta* presentation_time, bool* end_of_stream);
 
   // Returns the buffer to the codec. If you previously specified a surface
   // when configuring this video decoder you can optionally render the buffer.
   void ReleaseOutputBuffer(int index, bool render);
 
   // Gets output buffers from media codec and keeps them inside the java class.
   // To access them, use DequeueOutputBuffer().
   void GetOutputBuffers();
 
+  static bool RegisterMediaCodecBridge(JNIEnv* env);
+
  protected:
   explicit MediaCodecBridge(const char* mime);
 
   // Calls start() against the media codec instance. Used in StartXXX() after
   // configuring media codec.
   void StartInternal();
 
   jobject media_codec() { return j_media_codec_.obj(); }
 
  private:
   // Java MediaCodec instance.
   base::android::ScopedJavaGlobalRef<jobject> j_media_codec_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaCodecBridge);
 };
 
 class AudioCodecBridge : public MediaCodecBridge {
  public:
-  explicit AudioCodecBridge(const AudioCodec codec);
+  // Returns an AudioCodecBridge instance if |codec| is supported, or a NULL
+  // pointer otherwise.
+  static AudioCodecBridge* Create(const AudioCodec codec);
 
   // Start the audio codec bridge.
   bool Start(const AudioCodec codec, int sample_rate, int channel_count,
              const uint8* extra_data, size_t extra_data_size,
              bool play_audio);
 
   // Play the output buffer. This call must be called after
   // DequeueOutputBuffer() and before ReleaseOutputBuffer.
   void PlayOutputBuffer(int index, size_t size);
+
+ private:
+  explicit AudioCodecBridge(const char* mime);
 };
 
 class VideoCodecBridge : public MediaCodecBridge {
  public:
-  explicit VideoCodecBridge(const VideoCodec codec);
+  // Returns an VideoCodecBridge instance if |codec| is supported, or a NULL
+  // pointer otherwise.
+  static VideoCodecBridge* Create(const VideoCodec codec);
 
   // Start the video codec bridge.
   // TODO(qinmin): Pass codec specific data if available.
   bool Start(
       const VideoCodec codec, const gfx::Size& size, jobject surface);
+
+ private:
+  explicit VideoCodecBridge(const char* mime);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_CODEC_BRIDGE_H_