Remove GraphicBufferSource wrapper from OMX HAL: 1

/*

 * Copyright (C) 2013 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 GRAPHIC_BUFFER_SOURCE_H_

#define GRAPHIC_BUFFER_SOURCE_H_

#include <gui/IGraphicBufferProducer.h>

#include <gui/BufferQueue.h>

#include <utils/RefBase.h>

#include <VideoAPI.h>

#include <media/IOMX.h>

#include <media/OMXFenceParcelable.h>

#include <media/stagefright/foundation/ABase.h>

#include <media/stagefright/foundation/AHandlerReflector.h>

#include <media/stagefright/foundation/ALooper.h>

#include <android/BnGraphicBufferSource.h>

#include <android/BnOMXBufferSource.h>

namespace android {

using ::android::binder::Status;

struct FrameDropper;

/*

 * This class is used to feed OMX codecs from a Surface via BufferQueue.

 *

 * Instances of the class don't run on a dedicated thread.  Instead,

 * various events trigger data movement:

 *

 *  - Availability of a new frame of data from the BufferQueue (notified

 *    via the onFrameAvailable callback).

 *  - The return of a codec buffer (via OnEmptyBufferDone).

 *  - Application signaling end-of-stream.

 *  - Transition to or from "executing" state.

 *

 * Frames of data (and, perhaps, the end-of-stream indication) can arrive

 * before the codec is in the "executing" state, so we need to queue

 * things up until we're ready to go.

 */

class GraphicBufferSource : public BnGraphicBufferSource,

                            public BufferQueue::ConsumerListener {

public:

    GraphicBufferSource();

    virtual ~GraphicBufferSource();

    // We can't throw an exception if the constructor fails, so we just set

    // this and require that the caller test the value.

    status_t initCheck() const {

        return mInitCheck;

    }

    // Returns the handle to the producer side of the BufferQueue.  Buffers

    // queued on this will be received by GraphicBufferSource.

    sp<IGraphicBufferProducer> getIGraphicBufferProducer() const {

        return mProducer;

    }

    // This is called when OMX transitions to OMX_StateExecuting, which means

    // we can start handing it buffers.  If we already have buffers of data

    // sitting in the BufferQueue, this will send them to the codec.

    Status onOmxExecuting();

    // This is called when OMX transitions to OMX_StateIdle, indicating that

    // the codec is meant to return all buffers back to the client for them

    // to be freed. Do NOT submit any more buffers to the component.

    Status onOmxIdle();

    // This is called when OMX transitions to OMX_StateLoaded, indicating that

    // we are shutting down.

    Status onOmxLoaded();

    // A "codec buffer", i.e. a buffer that can be used to pass data into

    // the encoder, has been allocated.  (This call does not call back into

    // OMXNodeInstance.)

    Status onInputBufferAdded(int32_t bufferID);

    // Called from OnEmptyBufferDone.  If we have a BQ buffer available,

    // fill it with a new frame of data; otherwise, just mark it as available.

    Status onInputBufferEmptied(

            int32_t bufferID, const OMXFenceParcelable& fenceParcel);

    // Configure the buffer source to be used with an OMX node with the default

    // data space.

    Status configure(const sp<IOMXNode>& omxNode, int32_t dataSpace) override;

    // This is called after the last input frame has been submitted or buffer

    // timestamp is greater or equal than stopTimeUs. We need to submit an empty

    // buffer with the EOS flag set.  If we don't have a codec buffer ready,

    // we just set the mEndOfStream flag.

    Status signalEndOfInputStream() override;

    // If suspend is true, all incoming buffers (including those currently

    // in the BufferQueue) with timestamp larger than timeUs will be discarded

    // until the suspension is lifted. If suspend is false, all incoming buffers

    // including those currently in the BufferQueue) with timestamp larger than

    // timeUs will be processed. timeUs uses SYSTEM_TIME_MONOTONIC time base.

    Status setSuspend(bool suspend, int64_t timeUs) override;

    // Specifies the interval after which we requeue the buffer previously

    // queued to the encoder. This is useful in the case of surface flinger

    // providing the input surface if the resulting encoded stream is to

    // be displayed "live". If we were not to push through the extra frame

    // the decoder on the remote end would be unable to decode the latest frame.

    // This API must be called before transitioning the encoder to "executing"

    // state and once this behaviour is specified it cannot be reset.

    Status setRepeatPreviousFrameDelayUs(int64_t repeatAfterUs) override;

    // Sets the input buffer timestamp offset.

    // When set, the sample's timestamp will be adjusted with the timeOffsetUs.

    Status setTimeOffsetUs(int64_t timeOffsetUs) override;

    // When set, the max frame rate fed to the encoder will be capped at maxFps.

    Status setMaxFps(float maxFps) override;

    // Sets the time lapse (or slow motion) parameters.

    // When set, the sample's timestamp will be modified to playback framerate,

    // and capture timestamp will be modified to capture rate.

    Status setTimeLapseConfig(int64_t timePerFrameUs, int64_t timePerCaptureUs) override;

    // Sets the start time us (in system time), samples before which should

    // be dropped and not submitted to encoder

    Status setStartTimeUs(int64_t startTimeUs) override;

    // Sets the stop time us (in system time), samples after which should be dropped

    // and not submitted to encoder. timeUs uses SYSTEM_TIME_MONOTONIC time base.

    Status setStopTimeUs(int64_t stopTimeUs) override;

    // Sets the desired color aspects, e.g. to be used when producer does not specify a dataspace.

    Status setColorAspects(int32_t aspectsPacked) override;

protected:

    // BufferQueue::ConsumerListener interface, called when a new frame of

    // data is available.  If we're executing and a codec buffer is

    // available, we acquire the buffer, copy the GraphicBuffer reference

    // into the codec buffer, and call Empty[This]Buffer.  If we're not yet

    // executing or there's no codec buffer available, we just increment

    // mNumFramesAvailable and return.

    void onFrameAvailable(const BufferItem& item) override;

    // BufferQueue::ConsumerListener interface, called when the client has

    // released one or more GraphicBuffers.  We clear out the appropriate

    // set of mBufferSlot entries.

    void onBuffersReleased() override;

    // BufferQueue::ConsumerListener interface, called when the client has

    // changed the sideband stream. GraphicBufferSource doesn't handle sideband

    // streams so this is a no-op (and should never be called).

    void onSidebandStreamChanged() override;

private:

    // Keep track of codec input buffers.  They may either be available

    // (mGraphicBuffer == NULL) or in use by the codec.

    struct CodecBuffer {

        IOMX::buffer_id mBufferID;

        // buffer producer's frame-number for buffer

        uint64_t mFrameNumber;

        // buffer producer's buffer slot for buffer

        int mSlot;

        sp<GraphicBuffer> mGraphicBuffer;

    };

    // Returns the index of an available codec buffer.  If none are

    // available, returns -1.  Mutex must be held by caller.

    int findAvailableCodecBuffer_l();

    // Returns true if a codec buffer is available.

    bool isCodecBufferAvailable_l() {

        return findAvailableCodecBuffer_l() >= 0;

    }

    // Finds the mCodecBuffers entry that matches.  Returns -1 if not found.

    int findMatchingCodecBuffer_l(IOMX::buffer_id bufferID);

    // Fills a codec buffer with a frame from the BufferQueue.  This must

    // only be called when we know that a frame of data is ready (i.e. we're

    // in the onFrameAvailable callback, or if we're in codecBufferEmptied

    // and mNumFramesAvailable is nonzero).  Returns without doing anything if

    // we don't have a codec buffer available.

    //

    // Returns true if we successfully filled a codec buffer with a BQ buffer.

    bool fillCodecBuffer_l();

    // Marks the mCodecBuffers entry as in-use, copies the GraphicBuffer

    // reference into the codec buffer, and submits the data to the codec.

    status_t submitBuffer_l(const BufferItem &item, int cbi);

    // Submits an empty buffer, with the EOS flag set.   Returns without

    // doing anything if we don't have a codec buffer available.

    void submitEndOfInputStream_l();

    // Acquire buffer from the consumer

    status_t acquireBuffer(BufferItem *bi);

    // Release buffer to the consumer

    void releaseBuffer(int id, uint64_t frameNum, const sp<Fence> &fence);

    void setLatestBuffer_l(const BufferItem &item);

    bool repeatLatestBuffer_l();

    bool getTimestamp(const BufferItem &item, int64_t *codecTimeUs);

    // called when the data space of the input buffer changes

    void onDataSpaceChanged_l(android_dataspace dataSpace, android_pixel_format pixelFormat);

    // Lock, covers all member variables.

    mutable Mutex mMutex;

    // Used to report constructor failure.

    status_t mInitCheck;

    // Pointer back to the IOMXNode that created us.  We send buffers here.

    sp<IOMXNode> mOMXNode;

    // Set by omxExecuting() / omxIdling().

    bool mExecuting;

    bool mSuspended;

    // The time to stop sending buffers.

    int64_t mStopTimeUs;

    // Last dataspace seen

    android_dataspace mLastDataSpace;

    // Our BufferQueue interfaces. mProducer is passed to the producer through

    // getIGraphicBufferProducer, and mConsumer is used internally to retrieve

    // the buffers queued by the producer.

    sp<IGraphicBufferProducer> mProducer;

    sp<IGraphicBufferConsumer> mConsumer;

    // Number of frames pending in BufferQueue that haven't yet been

    // forwarded to the codec.

    size_t mNumFramesAvailable;

    // Number of frames acquired from consumer (debug only)

    int32_t mNumBufferAcquired;

    // Set to true if we want to send end-of-stream after we run out of

    // frames in BufferQueue.

    bool mEndOfStream;

    bool mEndOfStreamSent;

    // Cache of GraphicBuffers from the buffer queue.  When the codec

    // is done processing a GraphicBuffer, we can use this to map back

    // to a slot number.

    sp<GraphicBuffer> mBufferSlot[BufferQueue::NUM_BUFFER_SLOTS];

    int32_t mBufferUseCount[BufferQueue::NUM_BUFFER_SLOTS];

    // Tracks codec buffers.

    Vector<CodecBuffer> mCodecBuffers;

    struct ActionItem {

        typedef enum {

            PAUSE,

            RESUME,

            STOP

        } ActionType;

        ActionType mAction;

        int64_t mActionTimeUs;

    };

    // Maintain last action timestamp to ensure all the action timestamps are

    // monotonically increasing.

    int64_t mLastActionTimeUs;

    // An action queue that queue up all the actions sent to GraphicBufferSource.

    // STOP action should only show up at the end of the list as all the actions

    // after a STOP action will be discarded. mActionQueue is protected by mMutex.

    List<ActionItem> mActionQueue;

    ////

    friend struct AHandlerReflector<GraphicBufferSource>;

    enum {

        kWhatRepeatLastFrame,

    };

    enum {

        kRepeatLastFrameCount = 10,

    };

    int64_t mPrevOriginalTimeUs;

    int64_t mSkipFramesBeforeNs;

    sp<FrameDropper> mFrameDropper;

    sp<ALooper> mLooper;

    sp<AHandlerReflector<GraphicBufferSource> > mReflector;

    int64_t mRepeatAfterUs;

    int32_t mRepeatLastFrameGeneration;

    int64_t mRepeatLastFrameTimestamp;

    int32_t mRepeatLastFrameCount;

    int mLatestBufferId;

    uint64_t mLatestBufferFrameNum;

    sp<Fence> mLatestBufferFence;

    // The previous buffer should've been repeated but

    // no codec buffer was available at the time.

    bool mRepeatBufferDeferred;

    // Time lapse / slow motion configuration

    int64_t mTimePerCaptureUs;

    int64_t mTimePerFrameUs;

    int64_t mPrevCaptureUs;

    int64_t mPrevFrameUs;

    int64_t mInputBufferTimeOffsetUs;

    ColorAspects mColorAspects;

    class OmxBufferSource;

    sp<OmxBufferSource> mOmxBufferSource;

    void onMessageReceived(const sp<AMessage> &msg);

    DISALLOW_EVIL_CONSTRUCTORS(GraphicBufferSource);

};

}  // namespace android

#endif  // GRAPHIC_BUFFER_SOURCE_H_