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* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <pthread.h>
#include <utils/RefBase.h>
#include <utils/threads.h>
namespace android {
class ICamera;
class IMemory;
class Camera;
class CameraSourceTimeLapse : public CameraSource {
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();
// size of the encoded video.
int32_t mVideoWidth;
int32_t mVideoHeight;
// Time between two frames in final video (1/frameRate)
int64_t mTimeBetweenTimeLapseVideoFramesUs;
// Real timestamp of the last encoded time lapse frame
int64_t mLastTimeLapseFrameRealTimestampUs;
// 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;
// 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;
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);
// 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);
// 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);
// 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);
// 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