1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MEDIA_BASE_ANDROID_WEBAUDIO_MEDIA_CODEC_BRIDGE_H_ 6 #define MEDIA_BASE_ANDROID_WEBAUDIO_MEDIA_CODEC_BRIDGE_H_ 7 8 #include <jni.h> 9 10 #include "base/file_descriptor_posix.h" 11 #include "base/memory/shared_memory.h" 12 #include "media/base/media_export.h" 13 14 namespace media { 15 16 // This class serves as a bridge for native code to call Java 17 // functions in the Android MediaCodec class. See 18 // http://developer.android.com/reference/android/media/MediaCodec.html. 19 class MEDIA_EXPORT WebAudioMediaCodecBridge { 20 public: 21 // Create the bridge with the given file descriptors. We read from 22 // |encoded_audio_handle| to get the encoded audio data. Audio file 23 // information and decoded PCM samples are written to |pcm_output|. 24 // We also take ownership of |pcm_output|. 25 WebAudioMediaCodecBridge(base::SharedMemoryHandle encoded_audio_handle, 26 base::FileDescriptor pcm_output, 27 uint32_t data_size); 28 ~WebAudioMediaCodecBridge(); 29 30 // Inform JNI about this bridge. Returns true if registration 31 // succeeded. 32 static bool RegisterWebAudioMediaCodecBridge(JNIEnv* env); 33 34 // Start MediaCodec to process the encoded data in 35 // |encoded_audio_handle|. The PCM samples are sent to |pcm_output|. 36 static void RunWebAudioMediaCodec( 37 base::SharedMemoryHandle encoded_audio_handle, 38 base::FileDescriptor pcm_output, 39 uint32_t data_size); 40 41 void OnChunkDecoded(JNIEnv* env, 42 jobject /*java object*/, 43 jobject buf, 44 jint buf_size, 45 jint input_channel_count, 46 jint output_channel_count); 47 48 void InitializeDestination(JNIEnv* env, 49 jobject /*java object*/, 50 jint channel_count, 51 jint sample_rate, 52 jlong duration_us); 53 54 private: 55 // Handles MediaCodec processing of the encoded data in 56 // |encoded_audio_handle_| and sends the pcm data to |pcm_output_|. 57 // Returns true if decoding was successful. 58 bool DecodeInMemoryAudioFile(); 59 60 // Save encoded audio data to a temporary file and return the file 61 // descriptor to that file. -1 is returned if the audio data could 62 // not be saved for any reason. 63 int SaveEncodedAudioToFile(JNIEnv*, jobject); 64 65 // The encoded audio data is read from this file descriptor for the 66 // shared memory that holds the encoded data. 67 base::SharedMemoryHandle encoded_audio_handle_; 68 69 // The audio file information and decoded pcm data are written to 70 // this file descriptor. We take ownership of this descriptor. 71 int pcm_output_; 72 73 // The length of the encoded data. 74 uint32_t data_size_; 75 76 DISALLOW_COPY_AND_ASSIGN(WebAudioMediaCodecBridge); 77 }; 78 79 } // namespace media 80 #endif // MEDIA_BASE_ANDROID_WEBAUDIO_MEDIA_CODEC_BRIDGE_H_ 81