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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/AudioSystem.h>
#include <media/stagefright/MediaSource.h>
namespace android {
class AudioRecord;
struct MediaBufferGroup;
struct AudioSource : public MediaSource {
// Note that the "channels" parameter is _not_ the number of channels,
// but a bitmask of AudioSystem::audio_channels constants.
AudioSource(
int inputSource, uint32_t sampleRate,
uint32_t channels = AudioSystem::CHANNEL_IN_MONO);
status_t initCheck() const;
virtual status_t start(MetaData *params = NULL);
virtual status_t stop();
virtual sp<MetaData> getFormat();
// Returns the maximum amplitude since last call.
int16_t getMaxAmplitude();
virtual status_t read(
MediaBuffer **buffer, const ReadOptions *options = NULL);
protected:
virtual ~AudioSource();
private:
enum { kMaxBufferSize = 2048 };
AudioRecord *mRecord;
status_t mInitCheck;
bool mStarted;
bool mCollectStats;
bool mTrackMaxAmplitude;
int64_t mStartTimeUs;
int16_t mMaxAmplitude;
int64_t mPrevSampleTimeUs;
int64_t mTotalLostFrames;
int64_t mPrevLostBytes;
MediaBufferGroup *mGroup;
void trackMaxAmplitude(int16_t *data, int nSamples);
AudioSource(const AudioSource &);
AudioSource &operator=(const AudioSource &);
};
} // namespace android
#endif // AUDIO_SOURCE_H_
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