libvideoeditor/lvpp/VideoEditorSRC.h

/*
 * Copyright (C) 2011 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.
 */

#include <stdint.h>

#include <utils/RefBase.h>
#include <utils/threads.h>

#include <media/stagefright/MediaSource.h>

#include "AudioBufferProvider.h"
#include "AudioResampler.h"

namespace android {

struct MediaBuffer;

class VideoEditorSRC : public MediaSource , public AudioBufferProvider {

    public:
        VideoEditorSRC(
            const sp<MediaSource> &source);

        virtual status_t start (MetaData *params = NULL);
        virtual status_t stop();
        virtual sp<MetaData> getFormat();
        virtual status_t read (
            MediaBuffer **buffer, const ReadOptions *options = NULL);

        virtual status_t getNextBuffer(Buffer* buffer);
        virtual void releaseBuffer(Buffer* buffer);

        void setResampling(int32_t sampleRate=kFreq32000Hz);

    enum { //Sampling freq
        kFreq8000Hz = 8000,
        kFreq11025Hz = 11025,
        kFreq12000Hz = 12000,
        kFreq16000Hz = 16000,
        kFreq22050Hz = 22050,
        kFreq240000Hz = 24000,
        kFreq32000Hz = 32000,
        kFreq44100 = 44100,
        kFreq48000 = 48000,
    };

    static const uint16_t UNITY_GAIN = 0x1000;
    static const int32_t DEFAULT_SAMPLING_FREQ = (int32_t)kFreq32000Hz; // kFreq44100;

    protected :
        virtual ~VideoEditorSRC();
    private:

        VideoEditorSRC();
        VideoEditorSRC &operator=(const VideoEditorSRC &);

        AudioResampler        *mResampler;
        sp<MediaSource>      mSource;
        MediaBuffer      *mCopyBuffer;
        int mBitDepth;
        int mChannelCnt;
        int mSampleRate;
        int32_t mOutputSampleRate;
        bool mStarted;
        bool mIsResamplingRequired;
        bool mIsChannelConvertionRequired; // for mono to stereo
        sp<MetaData> mOutputFormat;
        Mutex mLock;

        uint8_t* mInterframeBuffer;
        int32_t mInterframeBufferPosition;
        int32_t mLeftover;
        int32_t mLastReadSize ;

        int64_t mInitialTimeStampUs;
        int64_t mAccuOutBufferSize;

        int64_t mSeekTimeUs;
        ReadOptions::SeekMode mSeekMode;
        int16_t *mReSampledBuffer;

};

} //namespce android