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      1 // Copyright 2014 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 #include "media/midi/usb_midi_device_factory_android.h"
      6 
      7 #include <jni.h>
      8 #include <vector>
      9 
     10 #include "base/android/scoped_java_ref.h"
     11 #include "base/bind.h"
     12 #include "base/containers/hash_tables.h"
     13 #include "base/lazy_instance.h"
     14 #include "base/memory/scoped_vector.h"
     15 #include "base/message_loop/message_loop.h"
     16 #include "base/synchronization/lock.h"
     17 #include "jni/UsbMidiDeviceFactoryAndroid_jni.h"
     18 #include "media/midi/usb_midi_device_android.h"
     19 
     20 namespace media {
     21 
     22 namespace {
     23 
     24 typedef UsbMidiDevice::Factory::Callback Callback;
     25 
     26 }  // namespace
     27 
     28 UsbMidiDeviceFactoryAndroid::UsbMidiDeviceFactoryAndroid() : delegate_(NULL) {}
     29 
     30 UsbMidiDeviceFactoryAndroid::~UsbMidiDeviceFactoryAndroid() {
     31   JNIEnv* env = base::android::AttachCurrentThread();
     32   if (!raw_factory_.is_null())
     33     Java_UsbMidiDeviceFactoryAndroid_close(env, raw_factory_.obj());
     34 }
     35 
     36 void UsbMidiDeviceFactoryAndroid::EnumerateDevices(
     37     UsbMidiDeviceDelegate* delegate,
     38     Callback callback) {
     39   DCHECK(!delegate_);
     40   JNIEnv* env = base::android::AttachCurrentThread();
     41   uintptr_t pointer = reinterpret_cast<uintptr_t>(this);
     42   raw_factory_.Reset(Java_UsbMidiDeviceFactoryAndroid_create(env, pointer));
     43 
     44   delegate_ = delegate;
     45   callback_ = callback;
     46 
     47   if (Java_UsbMidiDeviceFactoryAndroid_enumerateDevices(
     48           env, raw_factory_.obj(), base::android::GetApplicationContext())) {
     49     // Asynchronous operation.
     50     return;
     51   }
     52   // No devices are found.
     53   ScopedVector<UsbMidiDevice> devices;
     54   callback.Run(true, &devices);
     55 }
     56 
     57 // Called from the Java world.
     58 void UsbMidiDeviceFactoryAndroid::OnUsbMidiDeviceRequestDone(
     59     JNIEnv* env,
     60     jobject caller,
     61     jobjectArray devices) {
     62   size_t size = env->GetArrayLength(devices);
     63   ScopedVector<UsbMidiDevice> devices_to_pass;
     64   for (size_t i = 0; i < size; ++i) {
     65     UsbMidiDeviceAndroid::ObjectRef raw_device(
     66         env, env->GetObjectArrayElement(devices, i));
     67     devices_to_pass.push_back(new UsbMidiDeviceAndroid(raw_device, delegate_));
     68   }
     69 
     70   callback_.Run(true, &devices_to_pass);
     71 }
     72 
     73 bool UsbMidiDeviceFactoryAndroid::RegisterUsbMidiDeviceFactory(JNIEnv* env) {
     74   return RegisterNativesImpl(env);
     75 }
     76 
     77 }  // namespace media
     78