media: Clean up MediaCodecBridge and remove subclasses

media/base/android/media_codec_bridge_impl.h

Index: media/base/android/media_codec_bridge_impl.h
diff --git a/media/base/android/media_codec_bridge_impl.h b/media/base/android/media_codec_bridge_impl.h
index ed538354aa73ad7c56ffb583381ffa0e0d7eb82f..972a2839897c4b3277af998eb7b1c41092f6bc89 100644
--- a/media/base/android/media_codec_bridge_impl.h
+++ b/media/base/android/media_codec_bridge_impl.h
@@ -25,53 +25,47 @@ namespace media {
 // A bridge to a Java MediaCodec.
 class MEDIA_EXPORT MediaCodecBridgeImpl : public MediaCodecBridge {
  public:
+  // Creates and starts a new MediaCodec configured for decoding. Returns
+  // nullptr on failure.
+  static std::unique_ptr<MediaCodecBridge> CreateVideoDecoder(
+      VideoCodec codec,
+      bool is_secure,         // Will be used with encrypted content.
+      const gfx::Size& size,  // Output frame size.
+      jobject surface,        // Output surface, optional.
+      jobject media_crypto,   // MediaCrypto object, optional.
+      // Codec specific data. See MediaCodec docs.
+      const std::vector<uint8_t>& csd0,
+      const std::vector<uint8_t>& csd1,
+      // Should adaptive playback be allowed if supported.
+      bool allow_adaptive_playback = true,
+      bool require_software_codec = false);
+
+  // Creates and starts a new MediaCodec configured for encoding. Returns
+  // nullptr on failure.
+  static std::unique_ptr<MediaCodecBridge> CreateVideoEncoder(
+      VideoCodec codec,       // e.g. media::kCodecVP8
+      const gfx::Size& size,  // input frame size
+      int bit_rate,           // bits/second
+      int frame_rate,         // frames/second
+      int i_frame_interval,   // count
+      int color_format);      // MediaCodecInfo.CodecCapabilities.
+
+  // Creates and starts a new MediaCodec configured for decoding. Returns
+  // nullptr on failure.
+  static std::unique_ptr<MediaCodecBridge> CreateAudioDecoder(
+      const AudioDecoderConfig& config,
+      jobject media_crypto);
+
   ~MediaCodecBridgeImpl() override;
-
-  // Calls start() against the media codec instance. Returns whether media
-  // codec was successfully started.
-  bool Start() override;
-
-  // Finishes the decode/encode session. The instance remains active
-  // and ready to be StartAudio/Video()ed again. HOWEVER, due to the buggy
-  // vendor's implementation , b/8125974, Stop() -> StartAudio/Video() may not
-  // work on some devices. For reliability, Stop() -> delete and recreate new
-  // instance -> StartAudio/Video() is recommended.
   void Stop() override;
-
-  // Calls flush() on the MediaCodec. All indices previously returned in calls
-  // to DequeueInputBuffer() and DequeueOutputBuffer() become invalid. Please
-  // note that this clears all the inputs in the media codec. In other words,
-  // there will be no outputs until new input is provided. Returns
-  // MEDIA_CODEC_ERROR if an unexpected error happens, or MEDIA_CODEC_OK
-  // otherwise.
   MediaCodecStatus Flush() override;
-
-  // Used for getting the output size. This is valid after DequeueInputBuffer()
-  // returns a format change by returning INFO_OUTPUT_FORMAT_CHANGED.
-  // Returns MEDIA_CODEC_ERROR if an error occurs, or MEDIA_CODEC_OK otherwise.
   MediaCodecStatus GetOutputSize(gfx::Size* size) override;
-
-  // Used for checking for new sampling rate after DequeueInputBuffer() returns
-  // INFO_OUTPUT_FORMAT_CHANGED
-  // Returns MEDIA_CODEC_ERROR if an error occurs, or MEDIA_CODEC_OK otherwise.
   MediaCodecStatus GetOutputSamplingRate(int* sampling_rate) override;
-
-  // Fills |channel_count| with the number of audio channels. Useful after
-  // INFO_OUTPUT_FORMAT_CHANGED.
-  // Returns MEDIA_CODEC_ERROR if an error occurs, or MEDIA_CODEC_OK otherwise.
   MediaCodecStatus GetOutputChannelCount(int* channel_count) override;
-
-  // Submits a byte array to the given input buffer. Call this after getting an
-  // available buffer from DequeueInputBuffer(). If |data| is NULL, assume the
-  // input buffer has already been populated (but still obey |size|).
-  // |data_size| must be less than kint32max (because Java).
   MediaCodecStatus QueueInputBuffer(int index,
                                     const uint8_t* data,
                                     size_t data_size,
                                     base::TimeDelta presentation_time) override;
-
-  // As above but for encrypted buffers. NULL |subsamples| indicates the
-  // whole buffer is encrypted.
   MediaCodecStatus QueueSecureInputBuffer(
       int index,
       const uint8_t* data,
@@ -81,22 +75,9 @@ class MEDIA_EXPORT MediaCodecBridgeImpl : public MediaCodecBridge {
       const std::vector<SubsampleEntry>& subsamples,
       const EncryptionScheme& encryption_scheme,
       base::TimeDelta presentation_time) override;
-
-  // Submits an empty buffer with the END_OF_STREAM flag set.
   void QueueEOS(int input_buffer_index) override;
-
-  // Returns:
-  // MEDIA_CODEC_OK if an input buffer is ready to be filled with valid data,
-  // MEDIA_CODEC_ENQUEUE_INPUT_AGAIN_LATER if no such buffer is available, or
-  // MEDIA_CODEC_ERROR if unexpected error happens.
   MediaCodecStatus DequeueInputBuffer(base::TimeDelta timeout,
                                       int* index) override;
-
-  // Dequeues an output buffer, block for up to |timeout|.
-  // Returns the status of this operation. If OK is returned, the output
-  // parameters should be populated. Otherwise, the values of output parameters
-  // should not be used.  Output parameters other than index/offset/size are
-  // optional and only set if not NULL.
   MediaCodecStatus DequeueOutputBuffer(base::TimeDelta timeout,
                                        int* index,
                                        size_t* offset,
@@ -105,38 +86,29 @@ class MEDIA_EXPORT MediaCodecBridgeImpl : public MediaCodecBridge {
                                        bool* end_of_stream,
                                        bool* key_frame) override;
 
-  // 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) override;
-
-  // Returns an input buffer's base pointer and capacity.
   MediaCodecStatus GetInputBuffer(int input_buffer_index,
                                   uint8_t** data,
                                   size_t* capacity) override;
-
-  // Copies |num| bytes from output buffer |index|'s |offset| into the memory
-  // region pointed to by |dst|. To avoid overflows, the size of both source
-  // and destination must be at least |num| bytes, and should not overlap.
-  // Returns MEDIA_CODEC_ERROR if an error occurs, or MEDIA_CODEC_OK otherwise.
   MediaCodecStatus CopyFromOutputBuffer(int index,
                                         size_t offset,
                                         void* dst,
                                         size_t num) override;
-
-  // Gets the component name. Before API level 18 this returns an empty string.
   std::string GetName() override;
+  bool SetSurface(jobject surface) override;
+  void SetVideoBitrate(int bps, int frame_rate) override;
+  void RequestKeyFrameSoon() override;
+  bool IsAdaptivePlaybackSupported() override;
 
- protected:
+ private:
   MediaCodecBridgeImpl(const std::string& mime,
                        bool is_secure,
                        MediaCodecDirection direction,
                        bool require_software_codec);
 
-  jobject media_codec() { return j_media_codec_.obj(); }
+  // Calls MediaCodec#start(). Returns whether it was successful.
+  bool Start();
 
-  MediaCodecDirection direction_;
-
- private:
   // Fills the given input buffer. Returns false if |data_size| exceeds the
   // input buffer's capacity (and doesn't touch the input buffer in that case).
   bool FillInputBuffer(int index,
@@ -153,108 +125,11 @@ class MEDIA_EXPORT MediaCodecBridgeImpl : public MediaCodecBridge {
                                           size_t* capacity);
 
   // The Java MediaCodecBridge instance.
-  base::android::ScopedJavaGlobalRef<jobject> j_media_codec_;
+  base::android::ScopedJavaGlobalRef<jobject> j_bridge_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaCodecBridgeImpl);
 };
 
-// A MediaCodecBridge for audio decoding.
-// TODO(watk): Move this into MediaCodecBridgeImpl.
-class MEDIA_EXPORT AudioCodecBridge : public MediaCodecBridgeImpl {
- public:
-  // See MediaCodecUtil::IsKnownUnaccelerated().
-  static bool IsKnownUnaccelerated(const AudioCodec& codec);
-
-  // Returns an AudioCodecBridge instance if |codec| is supported, or a NULL
-  // pointer otherwise.
-  static AudioCodecBridge* Create(const AudioCodec& codec);
-
-  // Starts the audio codec bridge.
-  bool ConfigureAndStart(const AudioDecoderConfig& config,
-                         jobject media_crypto) WARN_UNUSED_RESULT;
-
-  bool ConfigureAndStart(const AudioCodec& codec,
-                         int sample_rate,
-                         int channel_count,
-                         const uint8_t* extra_data,
-                         size_t extra_data_size,
-                         int64_t codec_delay_ns,
-                         int64_t seek_preroll_ns,
-                         jobject media_crypto) WARN_UNUSED_RESULT;
-
- private:
-  explicit AudioCodecBridge(const std::string& mime);
-
-  // Configure the java MediaFormat object with the extra codec data passed in.
-  bool ConfigureMediaFormat(jobject j_format,
-                            const AudioCodec& codec,
-                            const uint8_t* extra_data,
-                            size_t extra_data_size,
-                            int64_t codec_delay_ns,
-                            int64_t seek_preroll_ns);
-};
-
-// A MediaCodecBridge for video encoding and decoding.
-// TODO(watk): Move this into MediaCodecBridgeImpl.
-class MEDIA_EXPORT VideoCodecBridge : public MediaCodecBridgeImpl {
- public:
-  // See MediaCodecUtil::IsKnownUnaccelerated().
-  static bool IsKnownUnaccelerated(const VideoCodec& codec,
-                                   MediaCodecDirection direction);
-
-  // Create, start, and return a VideoCodecBridge decoder or NULL on failure.
-  static VideoCodecBridge* CreateDecoder(
-      const VideoCodec& codec,
-      bool is_secure,         // Will be used with encrypted content.
-      const gfx::Size& size,  // Output frame size.
-      jobject surface,        // Output surface, optional.
-      jobject media_crypto,   // MediaCrypto object, optional.
-      // Codec specific data. See MediaCodec docs.
-      const std::vector<uint8_t>& csd0,
-      const std::vector<uint8_t>& csd1,
-      // Should adaptive playback be allowed if supported.
-      bool allow_adaptive_playback = true,
-      bool require_software_codec = false);
-
-  // Create, start, and return a VideoCodecBridge encoder or NULL on failure.
-  static VideoCodecBridge* CreateEncoder(
-      const VideoCodec& codec,  // e.g. media::kCodecVP8
-      const gfx::Size& size,    // input frame size
-      int bit_rate,             // bits/second
-      int frame_rate,           // frames/second
-      int i_frame_interval,     // count
-      int color_format);        // MediaCodecInfo.CodecCapabilities.
-
-  void SetVideoBitrate(int bps, int frame_rate);
-  void RequestKeyFrameSoon();
-
-  // Returns whether adaptive playback is supported for this object given
-  // the new size.
-  bool IsAdaptivePlaybackSupported(int width, int height);
-
-  // Changes the output surface for the MediaCodec. May only be used on API
-  // level 23 and higher (Marshmallow).
-  bool SetSurface(jobject surface);
-
-  // Test-only method to set the return value of IsAdaptivePlaybackSupported().
-  // Without this function, the return value of that function will be device
-  // dependent. If |adaptive_playback_supported| is equal to 0, the return value
-  // will be false. If |adaptive_playback_supported| is larger than 0, the
-  // return value will be true.
-  void set_adaptive_playback_supported_for_testing(
-      int adaptive_playback_supported) {
-    adaptive_playback_supported_for_testing_ = adaptive_playback_supported;
-  }
-
- private:
-  VideoCodecBridge(const std::string& mime,
-                   bool is_secure,
-                   MediaCodecDirection direction,
-                   bool require_software_codec);
-
-  int adaptive_playback_supported_for_testing_;
-};
-
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_CODEC_BRIDGE_IMPL_H_