Initial Contribution
diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
new file mode 100644
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+++ b/include/media/AudioTrack.h
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+/*
+ * Copyright (C) 2007 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_AUDIOTRACK_H
+#define ANDROID_AUDIOTRACK_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <media/IAudioFlinger.h>
+#include <media/IAudioTrack.h>
+#include <media/AudioSystem.h>
+
+#include <utils/RefBase.h>
+#include <utils/Errors.h>
+#include <utils/IInterface.h>
+#include <utils/IMemory.h>
+#include <utils/threads.h>
+
+
+namespace android {
+
+// ----------------------------------------------------------------------------
+
+class audio_track_cblk_t;
+
+// ----------------------------------------------------------------------------
+
+class AudioTrack
+{
+public:
+
+ enum stream_type {
+ DEFAULT =-1,
+ VOICE_CALL = 0,
+ SYSTEM = 1,
+ RING = 2,
+ MUSIC = 3,
+ ALARM = 4,
+ NUM_STREAM_TYPES
+ };
+
+ enum channel_index {
+ MONO = 0,
+ LEFT = 0,
+ RIGHT = 1
+ };
+
+ /* Create Buffer on the stack and pass it to obtainBuffer()
+ * and releaseBuffer().
+ */
+
+ class Buffer
+ {
+ public:
+ enum {
+ MUTE = 0x00000001
+ };
+ uint32_t flags;
+ int channelCount;
+ int format;
+ size_t frameCount;
+ size_t size;
+ union {
+ void* raw;
+ short* i16;
+ int8_t* i8;
+ };
+ };
+
+ /* Returns AudioFlinger's frame count. AudioTrack's buffers will
+ * be created with this size.
+ */
+ static size_t frameCount();
+
+ /* As a convenience, if a callback is supplied, a handler thread
+ * is automatically created with the appropriate priority. This thread
+ * invokes the callback when a new buffer becomes availlable.
+ */
+ typedef void (*callback_t)(void* user, const Buffer& info);
+
+ /* Constructs an uninitialized AudioTrack. No connection with
+ * AudioFlinger takes place.
+ */
+ AudioTrack();
+
+ /* Creates an audio track and registers it with AudioFlinger.
+ * Once created, the track needs to be started before it can be used.
+ * Unspecified values are set to the audio hardware's current
+ * values.
+ */
+
+ AudioTrack( int streamType,
+ uint32_t sampleRate = 0,
+ int format = 0,
+ int channelCount = 0,
+ int bufferCount = 0,
+ uint32_t flags = 0,
+ callback_t cbf = 0, void* user = 0);
+
+
+ /* Terminates the AudioTrack and unregisters it from AudioFlinger.
+ * Also destroys all resources assotiated with the AudioTrack.
+ */
+ ~AudioTrack();
+
+
+ /* Initialize an uninitialized AudioTrack. */
+ status_t set(int streamType =-1,
+ uint32_t sampleRate = 0,
+ int format = 0,
+ int channelCount = 0,
+ int bufferCount = 0,
+ uint32_t flags = 0,
+ callback_t cbf = 0, void* user = 0);
+
+
+ /* Result of constructing the AudioTrack. This must be checked
+ * before using any AudioTrack API (except for set()), using
+ * an uninitialized AudoiTrack prduces undefined results.
+ */
+ status_t initCheck() const;
+
+ /* Returns this track's latency in nanoseconds or framecount.
+ * This only includes the latency due to the fill buffer size.
+ * In particular, the hardware or driver latencies are not accounted.
+ */
+ nsecs_t latency() const;
+
+ /* getters, see constructor */
+
+ int streamType() const;
+ uint32_t sampleRate() const;
+ int format() const;
+ int channelCount() const;
+ int bufferCount() const;
+
+
+ /* After it's created the track is not active. Call start() to
+ * make it active. If set, the callback will start being called.
+ */
+ void start();
+
+ /* Stop a track. If set, the callback will cease being called and
+ * obtainBuffer returns STOPPED. Note that obtainBuffer() still works
+ * and will fill up buffers until the pool is exhausted.
+ */
+ void stop();
+ bool stopped() const;
+
+ /* flush a stopped track. All pending buffers are discarded.
+ * This function has no effect if the track is not stoped.
+ */
+ void flush();
+
+ /* Pause a track. If set, the callback will cease being called and
+ * obtainBuffer returns STOPPED. Note that obtainBuffer() still works
+ * and will fill up buffers until the pool is exhausted.
+ */
+ void pause();
+
+ /* mute or unmutes this track.
+ * While mutted, the callback, if set, is still called.
+ */
+ void mute(bool);
+ bool muted() const;
+
+
+ /* set volume for this track, mostly used for games' sound effects
+ */
+ void setVolume(float left, float right);
+ void getVolume(float* left, float* right);
+
+ /* set sample rate for this track, mostly used for games' sound effects
+ */
+ void setSampleRate(int sampleRate);
+ uint32_t getSampleRate();
+
+ /* obtains a buffer of "frameCount" frames. The buffer must be
+ * filled entirely. If the track is stopped, obtainBuffer() returns
+ * STOPPED instead of NO_ERROR as long as there are buffers availlable,
+ * at which point NO_MORE_BUFFERS is returned.
+ * Buffers will be returned until the pool (buffercount())
+ * is exhausted, at which point obtainBuffer() will either block
+ * or return WOULD_BLOCK depending on the value of the "blocking"
+ * parameter.
+ */
+
+ enum {
+ NO_MORE_BUFFERS = 0x80000001,
+ STOPPED = 1
+ };
+
+ status_t obtainBuffer(Buffer* audioBuffer, bool blocking);
+ void releaseBuffer(Buffer* audioBuffer);
+
+
+ /* As a convenience we provide a write() interface to the audio buffer.
+ * This is implemented on top of lockBuffer/unlockBuffer. For best
+ * performance
+ *
+ */
+ ssize_t write(const void* buffer, size_t size);
+
+ /*
+ * Dumps the state of an audio track.
+ */
+ status_t dump(int fd, const Vector<String16>& args) const;
+
+private:
+ /* copying audio tracks is not allowed */
+ AudioTrack(const AudioTrack& other);
+ AudioTrack& operator = (const AudioTrack& other);
+
+ /* a small internal class to handle the callback */
+ class AudioTrackThread : public Thread
+ {
+ public:
+ AudioTrackThread(AudioTrack& receiver);
+ private:
+ friend class AudioTrack;
+ virtual bool threadLoop();
+ virtual status_t readyToRun();
+ virtual void onFirstRef();
+ AudioTrack& mReceiver;
+ Mutex mLock;
+ };
+
+ bool processAudioBuffer(const sp<AudioTrackThread>& thread);
+
+ sp<IAudioFlinger> mAudioFlinger;
+ sp<IAudioTrack> mAudioTrack;
+ sp<IMemory> mCblkMemory;
+ sp<AudioTrackThread> mAudioTrackThread;
+
+ float mVolume[2];
+ uint32_t mSampleRate;
+ size_t mFrameCount;
+
+ audio_track_cblk_t* mCblk;
+ uint8_t mStreamType;
+ uint8_t mFormat;
+ uint8_t mBufferCount;
+ uint8_t mChannelCount : 4;
+ uint8_t mMuted : 1;
+ uint8_t mReserved : 2;
+ status_t mStatus;
+ nsecs_t mLatency;
+
+ volatile int32_t mActive;
+
+ callback_t mCbf;
+ void* mUserData;
+
+ AudioTrack::Buffer mAudioBuffer;
+ size_t mPosition;
+
+ uint32_t mReservedFBC[4];
+};
+
+
+}; // namespace android
+
+#endif // ANDROID_AUDIOTRACK_H