Initial Contribution
diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
new file mode 100644
index 0000000..9fcbea5
--- /dev/null
+++ b/include/media/AudioSystem.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_AUDIOSYSTEM_H_
+#define ANDROID_AUDIOSYSTEM_H_
+
+#include <utils/RefBase.h>
+#include <utils/threads.h>
+#include <media/IAudioFlinger.h>
+
+namespace android {
+
+typedef void (*audio_error_callback)(status_t err);
+
+class AudioSystem
+{
+public:
+
+ enum audio_format {
+ DEFAULT = 0,
+ PCM_16_BIT,
+ PCM_8_BIT,
+ INVALID_FORMAT
+ };
+
+ enum audio_mode {
+ MODE_INVALID = -2,
+ MODE_CURRENT = -1,
+ MODE_NORMAL = 0,
+ MODE_RINGTONE,
+ MODE_IN_CALL,
+ NUM_MODES // not a valid entry, denotes end-of-list
+ };
+
+ enum audio_routes {
+ ROUTE_EARPIECE = (1 << 0),
+ ROUTE_SPEAKER = (1 << 1),
+ ROUTE_BLUETOOTH = (1 << 2),
+ ROUTE_HEADSET = (1 << 3),
+ ROUTE_ALL = (ROUTE_EARPIECE | ROUTE_SPEAKER | ROUTE_BLUETOOTH | ROUTE_HEADSET)
+ };
+
+ /* These are static methods to control the system-wide AudioFlinger
+ * only privileged processes can have access to them
+ */
+
+ // routing helper functions
+ static status_t speakerphone(bool state);
+ static status_t isSpeakerphoneOn(bool* state);
+ static status_t bluetoothSco(bool state);
+ static status_t isBluetoothScoOn(bool* state);
+ static status_t muteMicrophone(bool state);
+ static status_t isMicrophoneMuted(bool *state);
+
+ static status_t setMasterVolume(float value);
+ static status_t setMasterMute(bool mute);
+ static status_t getMasterVolume(float* volume);
+ static status_t getMasterMute(bool* mute);
+
+ static status_t setStreamVolume(int stream, float value);
+ static status_t setStreamMute(int stream, bool mute);
+ static status_t getStreamVolume(int stream, float* volume);
+ static status_t getStreamMute(int stream, bool* mute);
+
+ static status_t setMode(int mode);
+ static status_t getMode(int* mode);
+
+ static status_t setRouting(int mode, uint32_t routes, uint32_t mask);
+ static status_t getRouting(int mode, uint32_t* routes);
+
+ static status_t isMusicActive(bool *state);
+
+ // Temporary interface, do not use
+ // TODO: Replace with a more generic key:value get/set mechanism
+ static status_t setParameter(const char* key, const char* value);
+
+ static void setErrorCallback(audio_error_callback cb);
+
+ // helper function to obtain AudioFlinger service handle
+ static const sp<IAudioFlinger>& get_audio_flinger();
+
+ static float linearToLog(int volume);
+ static int logToLinear(float volume);
+
+ // ----------------------------------------------------------------------------
+
+private:
+
+ class DeathNotifier: public IBinder::DeathRecipient
+ {
+ public:
+ DeathNotifier() {
+ }
+
+ virtual void binderDied(const wp<IBinder>& who);
+ };
+
+ static sp<DeathNotifier> gDeathNotifier;
+
+ friend class DeathNotifier;
+
+ static Mutex gLock;
+ static sp<IAudioFlinger> gAudioFlinger;
+ static audio_error_callback gAudioErrorCallback;
+};
+
+}; // namespace android
+
+#endif /*ANDROID_AUDIOSYSTEM_H_*/