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/*
* Copyright (C) 2009 The Android Open Source Project
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* 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_ the number of channels,
// _not_ a bitmask of audio_channels_t constants.
AudioSource(
audio_source_t inputSource,
uint32_t sampleRate,
uint32_t channels = 1);
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 dataCallback(const AudioRecord::Buffer& buffer);
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;
int64_t mAutoRampStartUs;
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 &);
#ifdef QCOM_HARDWARE
//additions for tunnel source
public:
AudioSource(
audio_source_t inputSource, const sp<MetaData>& meta );
private:
audio_format_t mFormat;
String8 mMime;
int32_t mMaxBufferSize;
int64_t bufferDurationUs( ssize_t n );
#endif
};
} // namespace android
#endif // AUDIO_SOURCE_H_
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