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diff --git a/include/media/stagefright/AudioSource.h b/include/media/stagefright/AudioSource.h
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+++ b/include/media/stagefright/AudioSource.h
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+/*
+ * Copyright (C) 2009 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 AUDIO_SOURCE_H_
+
+#define AUDIO_SOURCE_H_
+
+#include <media/AudioRecord.h>
+#include <media/AudioSystem.h>
+#include <media/stagefright/MediaSource.h>
+#include <media/stagefright/MediaBuffer.h>
+#include <utils/List.h>
+
+#include <system/audio.h>
+
+namespace android {
+
+class AudioRecord;
+
+struct AudioSource : public MediaSource, public MediaBufferObserver {
+    // Note that the "channels" parameter is _not_ the number of channels,
+    // but a bitmask of audio_channels_t constants.
+    AudioSource(
+            audio_source_t inputSource, uint32_t sampleRate,
+            uint32_t channels = AUDIO_CHANNEL_IN_MONO);
+
+    status_t initCheck() const;
+
+    virtual status_t start(MetaData *params = NULL);
+    virtual status_t stop() { return reset(); }
+    virtual sp<MetaData> getFormat();
+
+    // Returns the maximum amplitude since last call.
+    int16_t getMaxAmplitude();
+
+    virtual status_t read(
+            MediaBuffer **buffer, const ReadOptions *options = NULL);
+
+    status_t dataCallbackTimestamp(const AudioRecord::Buffer& buffer, int64_t timeUs);
+    virtual void signalBufferReturned(MediaBuffer *buffer);
+
+protected:
+    virtual ~AudioSource();
+
+private:
+    enum {
+        kMaxBufferSize = 2048,
+
+        // After the initial mute, we raise the volume linearly
+        // over kAutoRampDurationUs.
+        kAutoRampDurationUs = 300000,
+
+        // This is the initial mute duration to suppress
+        // the video recording signal tone
+        kAutoRampStartUs = 0,
+    };
+
+    Mutex mLock;
+    Condition mFrameAvailableCondition;
+    Condition mFrameEncodingCompletionCondition;
+
+    AudioRecord *mRecord;
+    status_t mInitCheck;
+    bool mStarted;
+    int32_t mSampleRate;
+
+    bool mTrackMaxAmplitude;
+    int64_t mStartTimeUs;
+    int16_t mMaxAmplitude;
+    int64_t mPrevSampleTimeUs;
+    int64_t mInitialReadTimeUs;
+    int64_t mNumFramesReceived;
+    int64_t mNumClientOwnedBuffers;
+
+    List<MediaBuffer * > mBuffersReceived;
+
+    void trackMaxAmplitude(int16_t *data, int nSamples);
+
+    // This is used to raise the volume from mute to the
+    // actual level linearly.
+    void rampVolume(
+        int32_t startFrame, int32_t rampDurationFrames,
+        uint8_t *data,   size_t bytes);
+
+    void queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs);
+    void releaseQueuedFrames_l();
+    void waitOutstandingEncodingFrames_l();
+    status_t reset();
+
+    AudioSource(const AudioSource &);
+    AudioSource &operator=(const AudioSource &);
+};
+
+}  // namespace android
+
+#endif  // AUDIO_SOURCE_H_