| /* |
| * Copyright (C) 2010 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 CAMERA_SOURCE_TIME_LAPSE_H_ |
| |
| #define CAMERA_SOURCE_TIME_LAPSE_H_ |
| |
| #include <pthread.h> |
| |
| #include <utils/RefBase.h> |
| #include <utils/threads.h> |
| |
| namespace android { |
| |
| class ICamera; |
| class IMemory; |
| class Camera; |
| |
| class CameraSourceTimeLapse : public CameraSource { |
| public: |
| static CameraSourceTimeLapse *CreateFromCamera( |
| const sp<ICamera> &camera, |
| const sp<ICameraRecordingProxy> &proxy, |
| int32_t cameraId, |
| Size videoSize, |
| int32_t videoFrameRate, |
| const sp<Surface>& surface, |
| int64_t timeBetweenTimeLapseFrameCaptureUs); |
| |
| virtual ~CameraSourceTimeLapse(); |
| |
| // If the frame capture interval is large, read will block for a long time. |
| // Due to the way the mediaRecorder framework works, a stop() call from |
| // mediaRecorder waits until the read returns, causing a long wait for |
| // stop() to return. To avoid this, we can make read() return a copy of the |
| // last read frame with the same time stamp frequently. This keeps the |
| // read() call from blocking too long. Calling this function quickly |
| // captures another frame, keeps its copy, and enables this mode of read() |
| // returning quickly. |
| void startQuickReadReturns(); |
| |
| private: |
| // If true, will use still camera takePicture() for time lapse frames |
| // If false, will use the videocamera frames instead. |
| bool mUseStillCameraForTimeLapse; |
| |
| // Size of picture taken from still camera. This may be larger than the size |
| // of the video, as still camera may not support the exact video resolution |
| // demanded. See setPictureSizeToClosestSupported(). |
| int32_t mPictureWidth; |
| int32_t mPictureHeight; |
| |
| // size of the encoded video. |
| int32_t mVideoWidth; |
| int32_t mVideoHeight; |
| |
| // True if we need to crop the still camera image to get the video frame. |
| bool mNeedCropping; |
| |
| // Start location of the cropping rectangle. |
| int32_t mCropRectStartX; |
| int32_t mCropRectStartY; |
| |
| // Time between capture of two frames during time lapse recording |
| // Negative value indicates that timelapse is disabled. |
| int64_t mTimeBetweenTimeLapseFrameCaptureUs; |
| |
| // Time between two frames in final video (1/frameRate) |
| int64_t mTimeBetweenTimeLapseVideoFramesUs; |
| |
| // Real timestamp of the last encoded time lapse frame |
| int64_t mLastTimeLapseFrameRealTimestampUs; |
| |
| // Thread id of thread which takes still picture and sleeps in a loop. |
| pthread_t mThreadTimeLapse; |
| |
| // Variable set in dataCallbackTimestamp() to help skipCurrentFrame() |
| // to know if current frame needs to be skipped. |
| bool mSkipCurrentFrame; |
| |
| // Lock for accessing mCameraIdle |
| Mutex mCameraIdleLock; |
| |
| // Condition variable to wait on if camera is is not yet idle. Once the |
| // camera gets idle, this variable will be signalled. |
| Condition mCameraIdleCondition; |
| |
| // True if camera is in preview mode and ready for takePicture(). |
| // False after a call to takePicture() but before the final compressed |
| // data callback has been called and preview has been restarted. |
| volatile bool mCameraIdle; |
| |
| // True if stop() is waiting for camera to get idle, i.e. for the last |
| // takePicture() to complete. This is needed so that dataCallbackTimestamp() |
| // can return immediately. |
| volatile bool mStopWaitingForIdleCamera; |
| |
| // Lock for accessing quick stop variables. |
| Mutex mQuickStopLock; |
| |
| // Condition variable to wake up still picture thread. |
| Condition mTakePictureCondition; |
| |
| // mQuickStop is set to true if we use quick read() returns, otherwise it is set |
| // to false. Once in this mode read() return a copy of the last read frame |
| // with the same time stamp. See startQuickReadReturns(). |
| volatile bool mQuickStop; |
| |
| // Forces the next frame passed to dataCallbackTimestamp() to be read |
| // as a time lapse frame. Used by startQuickReadReturns() so that the next |
| // frame wakes up any blocking read. |
| volatile bool mForceRead; |
| |
| // Stores a copy of the MediaBuffer read in the last read() call after |
| // mQuickStop was true. |
| MediaBuffer* mLastReadBufferCopy; |
| |
| // Status code for last read. |
| status_t mLastReadStatus; |
| |
| CameraSourceTimeLapse( |
| const sp<ICamera> &camera, |
| const sp<ICameraRecordingProxy> &proxy, |
| int32_t cameraId, |
| Size videoSize, |
| int32_t videoFrameRate, |
| const sp<Surface>& surface, |
| int64_t timeBetweenTimeLapseFrameCaptureUs); |
| |
| // Wrapper over CameraSource::signalBufferReturned() to implement quick stop. |
| // It only handles the case when mLastReadBufferCopy is signalled. Otherwise |
| // it calls the base class' function. |
| virtual void signalBufferReturned(MediaBuffer* buffer); |
| |
| // Wrapper over CameraSource::read() to implement quick stop. |
| virtual status_t read(MediaBuffer **buffer, const ReadOptions *options = NULL); |
| |
| // For still camera case starts a thread which calls camera's takePicture() |
| // in a loop. For video camera case, just starts the camera's video recording. |
| virtual void startCameraRecording(); |
| |
| // For still camera case joins the thread created in startCameraRecording(). |
| // For video camera case, just stops the camera's video recording. |
| virtual void stopCameraRecording(); |
| |
| // For still camera case don't need to do anything as memory is locally |
| // allocated with refcounting. |
| // For video camera case just tell the camera to release the frame. |
| virtual void releaseRecordingFrame(const sp<IMemory>& frame); |
| |
| // mSkipCurrentFrame is set to true in dataCallbackTimestamp() if the current |
| // frame needs to be skipped and this function just returns the value of mSkipCurrentFrame. |
| virtual bool skipCurrentFrame(int64_t timestampUs); |
| |
| // Handles the callback to handle raw frame data from the still camera. |
| // Creates a copy of the frame data as the camera can reuse the frame memory |
| // once this callback returns. The function also sets a new timstamp corresponding |
| // to one frame time ahead of the last encoded frame's time stamp. It then |
| // calls dataCallbackTimestamp() of the base class with the copied data and the |
| // modified timestamp, which will think that it recieved the frame from a video |
| // camera and proceed as usual. |
| virtual void dataCallback(int32_t msgType, const sp<IMemory> &data); |
| |
| // In the video camera case calls skipFrameAndModifyTimeStamp() to modify |
| // timestamp and set mSkipCurrentFrame. |
| // Then it calls the base CameraSource::dataCallbackTimestamp() |
| virtual void dataCallbackTimestamp(int64_t timestampUs, int32_t msgType, |
| const sp<IMemory> &data); |
| |
| // Convenience function to fill mLastReadBufferCopy from the just read |
| // buffer. |
| void fillLastReadBufferCopy(MediaBuffer& sourceBuffer); |
| |
| // If the passed in size (width x height) is a supported video/preview size, |
| // the function sets the camera's video/preview size to it and returns true. |
| // Otherwise returns false. |
| bool trySettingVideoSize(int32_t width, int32_t height); |
| |
| // The still camera may not support the demanded video width and height. |
| // We look for the supported picture sizes from the still camera and |
| // choose the smallest one with either dimensions higher than the corresponding |
| // video dimensions. The still picture will be cropped to get the video frame. |
| // The function returns true if the camera supports picture sizes greater than |
| // or equal to the passed in width and height, and false otherwise. |
| bool setPictureSizeToClosestSupported(int32_t width, int32_t height); |
| |
| // Computes the offset of the rectangle from where to start cropping the |
| // still image into the video frame. We choose the center of the image to be |
| // cropped. The offset is stored in (mCropRectStartX, mCropRectStartY). |
| bool computeCropRectangleOffset(); |
| |
| // Crops the source data into a smaller image starting at |
| // (mCropRectStartX, mCropRectStartY) and of the size of the video frame. |
| // The data is returned into a newly allocated IMemory. |
| sp<IMemory> cropYUVImage(const sp<IMemory> &source_data); |
| |
| // When video camera is used for time lapse capture, returns true |
| // until enough time has passed for the next time lapse frame. When |
| // the frame needs to be encoded, it returns false and also modifies |
| // the time stamp to be one frame time ahead of the last encoded |
| // frame's time stamp. |
| bool skipFrameAndModifyTimeStamp(int64_t *timestampUs); |
| |
| // Wrapper to enter threadTimeLapseEntry() |
| static void *ThreadTimeLapseWrapper(void *me); |
| |
| // Runs a loop which sleeps until a still picture is required |
| // and then calls mCamera->takePicture() to take the still picture. |
| // Used only in the case mUseStillCameraForTimeLapse = true. |
| void threadTimeLapseEntry(); |
| |
| // Wrapper to enter threadStartPreview() |
| static void *ThreadStartPreviewWrapper(void *me); |
| |
| // Starts the camera's preview. |
| void threadStartPreview(); |
| |
| // Starts thread ThreadStartPreviewWrapper() for restarting preview. |
| // Needs to be done in a thread so that dataCallback() which calls this function |
| // can return, and the camera can know that takePicture() is done. |
| void restartPreview(); |
| |
| // Creates a copy of source_data into a new memory of final type MemoryBase. |
| sp<IMemory> createIMemoryCopy(const sp<IMemory> &source_data); |
| |
| CameraSourceTimeLapse(const CameraSourceTimeLapse &); |
| CameraSourceTimeLapse &operator=(const CameraSourceTimeLapse &); |
| }; |
| |
| } // namespace android |
| |
| #endif // CAMERA_SOURCE_TIME_LAPSE_H_ |