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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 //#define LOG_NDEBUG 0
     18 #define LOG_TAG "CameraSourceTimeLapse"
     19 
     20 #include <binder/IPCThreadState.h>
     21 #include <binder/MemoryBase.h>
     22 #include <binder/MemoryHeapBase.h>
     23 #include <media/stagefright/foundation/ADebug.h>
     24 #include <media/stagefright/CameraSource.h>
     25 #include <media/stagefright/CameraSourceTimeLapse.h>
     26 #include <media/stagefright/MetaData.h>
     27 #include <camera/Camera.h>
     28 #include <camera/CameraParameters.h>
     29 #include <utils/String8.h>
     30 #include <utils/Vector.h>
     31 
     32 namespace android {
     33 
     34 // static
     35 CameraSourceTimeLapse *CameraSourceTimeLapse::CreateFromCamera(
     36         const sp<ICamera> &camera,
     37         const sp<ICameraRecordingProxy> &proxy,
     38         int32_t cameraId,
     39         Size videoSize,
     40         int32_t videoFrameRate,
     41         const sp<Surface>& surface,
     42         int64_t timeBetweenFrameCaptureUs) {
     43 
     44     CameraSourceTimeLapse *source = new
     45             CameraSourceTimeLapse(camera, proxy, cameraId,
     46                 videoSize, videoFrameRate, surface,
     47                 timeBetweenFrameCaptureUs);
     48 
     49     if (source != NULL) {
     50         if (source->initCheck() != OK) {
     51             delete source;
     52             return NULL;
     53         }
     54     }
     55     return source;
     56 }
     57 
     58 CameraSourceTimeLapse::CameraSourceTimeLapse(
     59         const sp<ICamera>& camera,
     60         const sp<ICameraRecordingProxy>& proxy,
     61         int32_t cameraId,
     62         Size videoSize,
     63         int32_t videoFrameRate,
     64         const sp<Surface>& surface,
     65         int64_t timeBetweenFrameCaptureUs)
     66     : CameraSource(camera, proxy, cameraId, videoSize, videoFrameRate, surface, true),
     67       mTimeBetweenTimeLapseVideoFramesUs(1E6/videoFrameRate),
     68       mLastTimeLapseFrameRealTimestampUs(0),
     69       mSkipCurrentFrame(false) {
     70 
     71     mTimeBetweenFrameCaptureUs = timeBetweenFrameCaptureUs;
     72     ALOGD("starting time lapse mode: %lld us",
     73         mTimeBetweenFrameCaptureUs);
     74 
     75     mVideoWidth = videoSize.width;
     76     mVideoHeight = videoSize.height;
     77 
     78     if (!trySettingVideoSize(videoSize.width, videoSize.height)) {
     79         mInitCheck = NO_INIT;
     80     }
     81 
     82     // Initialize quick stop variables.
     83     mQuickStop = false;
     84     mForceRead = false;
     85     mLastReadBufferCopy = NULL;
     86     mStopWaitingForIdleCamera = false;
     87 }
     88 
     89 CameraSourceTimeLapse::~CameraSourceTimeLapse() {
     90     if (mLastReadBufferCopy) {
     91         mLastReadBufferCopy->release();
     92         mLastReadBufferCopy = NULL;
     93     }
     94 }
     95 
     96 void CameraSourceTimeLapse::startQuickReadReturns() {
     97     ALOGV("startQuickReadReturns");
     98     Mutex::Autolock autoLock(mQuickStopLock);
     99 
    100     // Enable quick stop mode.
    101     mQuickStop = true;
    102 
    103     // Force dataCallbackTimestamp() coming from the video camera to
    104     // not skip the next frame as we want read() to get a get a frame
    105     // right away.
    106     mForceRead = true;
    107 }
    108 
    109 bool CameraSourceTimeLapse::trySettingVideoSize(
    110         int32_t width, int32_t height) {
    111 
    112     ALOGV("trySettingVideoSize");
    113     int64_t token = IPCThreadState::self()->clearCallingIdentity();
    114     String8 s = mCamera->getParameters();
    115 
    116     CameraParameters params(s);
    117     Vector<Size> supportedSizes;
    118     params.getSupportedVideoSizes(supportedSizes);
    119     bool videoOutputSupported = false;
    120     if (supportedSizes.size() == 0) {
    121         params.getSupportedPreviewSizes(supportedSizes);
    122     } else {
    123         videoOutputSupported = true;
    124     }
    125 
    126     bool videoSizeSupported = false;
    127     for (uint32_t i = 0; i < supportedSizes.size(); ++i) {
    128         int32_t pictureWidth = supportedSizes[i].width;
    129         int32_t pictureHeight = supportedSizes[i].height;
    130 
    131         if ((pictureWidth == width) && (pictureHeight == height)) {
    132             videoSizeSupported = true;
    133         }
    134     }
    135 
    136     bool isSuccessful = false;
    137     if (videoSizeSupported) {
    138         ALOGV("Video size (%d, %d) is supported", width, height);
    139         if (videoOutputSupported) {
    140             params.setVideoSize(width, height);
    141         } else {
    142             params.setPreviewSize(width, height);
    143         }
    144         if (mCamera->setParameters(params.flatten()) == OK) {
    145             isSuccessful = true;
    146         } else {
    147             ALOGE("Failed to set preview size to %dx%d", width, height);
    148             isSuccessful = false;
    149         }
    150     }
    151 
    152     IPCThreadState::self()->restoreCallingIdentity(token);
    153     return isSuccessful;
    154 }
    155 
    156 void CameraSourceTimeLapse::signalBufferReturned(MediaBuffer* buffer) {
    157     ALOGV("signalBufferReturned");
    158     Mutex::Autolock autoLock(mQuickStopLock);
    159     if (mQuickStop && (buffer == mLastReadBufferCopy)) {
    160         buffer->setObserver(NULL);
    161         buffer->release();
    162     } else {
    163         return CameraSource::signalBufferReturned(buffer);
    164     }
    165 }
    166 
    167 void createMediaBufferCopy(
    168         const MediaBuffer& sourceBuffer,
    169         int64_t frameTime,
    170         MediaBuffer **newBuffer) {
    171 
    172     ALOGV("createMediaBufferCopy");
    173     size_t sourceSize = sourceBuffer.size();
    174     void* sourcePointer = sourceBuffer.data();
    175 
    176     (*newBuffer) = new MediaBuffer(sourceSize);
    177     memcpy((*newBuffer)->data(), sourcePointer, sourceSize);
    178 
    179     (*newBuffer)->meta_data()->setInt64(kKeyTime, frameTime);
    180 }
    181 
    182 void CameraSourceTimeLapse::fillLastReadBufferCopy(MediaBuffer& sourceBuffer) {
    183     ALOGV("fillLastReadBufferCopy");
    184     int64_t frameTime;
    185     CHECK(sourceBuffer.meta_data()->findInt64(kKeyTime, &frameTime));
    186     createMediaBufferCopy(sourceBuffer, frameTime, &mLastReadBufferCopy);
    187     mLastReadBufferCopy->add_ref();
    188     mLastReadBufferCopy->setObserver(this);
    189 }
    190 
    191 status_t CameraSourceTimeLapse::read(
    192         MediaBuffer **buffer, const ReadOptions *options) {
    193     ALOGV("read");
    194     if (mLastReadBufferCopy == NULL) {
    195         mLastReadStatus = CameraSource::read(buffer, options);
    196 
    197         // mQuickStop may have turned to true while read was blocked.
    198         // Make a copy of the buffer in that case.
    199         Mutex::Autolock autoLock(mQuickStopLock);
    200         if (mQuickStop && *buffer) {
    201             fillLastReadBufferCopy(**buffer);
    202         }
    203         return mLastReadStatus;
    204     } else {
    205         (*buffer) = mLastReadBufferCopy;
    206         (*buffer)->add_ref();
    207         return mLastReadStatus;
    208     }
    209 }
    210 
    211 sp<IMemory> CameraSourceTimeLapse::createIMemoryCopy(
    212         const sp<IMemory> &source_data) {
    213 
    214     ALOGV("createIMemoryCopy");
    215     size_t source_size = source_data->size();
    216     void* source_pointer = source_data->pointer();
    217 
    218     sp<MemoryHeapBase> newMemoryHeap = new MemoryHeapBase(source_size);
    219     sp<MemoryBase> newMemory = new MemoryBase(newMemoryHeap, 0, source_size);
    220     memcpy(newMemory->pointer(), source_pointer, source_size);
    221     return newMemory;
    222 }
    223 
    224 bool CameraSourceTimeLapse::skipCurrentFrame(int64_t timestampUs) {
    225     ALOGV("skipCurrentFrame");
    226     if (mSkipCurrentFrame) {
    227         mSkipCurrentFrame = false;
    228         return true;
    229     } else {
    230         return false;
    231     }
    232 }
    233 
    234 bool CameraSourceTimeLapse::skipFrameAndModifyTimeStamp(int64_t *timestampUs) {
    235     ALOGV("skipFrameAndModifyTimeStamp");
    236     if (mLastTimeLapseFrameRealTimestampUs == 0) {
    237         // First time lapse frame. Initialize mLastTimeLapseFrameRealTimestampUs
    238         // to current time (timestampUs) and save frame data.
    239         ALOGV("dataCallbackTimestamp timelapse: initial frame");
    240 
    241         mLastTimeLapseFrameRealTimestampUs = *timestampUs;
    242         return false;
    243     }
    244 
    245     {
    246         Mutex::Autolock autoLock(mQuickStopLock);
    247 
    248         // mForceRead may be set to true by startQuickReadReturns(). In that
    249         // case don't skip this frame.
    250         if (mForceRead) {
    251             ALOGV("dataCallbackTimestamp timelapse: forced read");
    252             mForceRead = false;
    253             *timestampUs =
    254                 mLastFrameTimestampUs + mTimeBetweenTimeLapseVideoFramesUs;
    255 
    256             // Really make sure that this video recording frame will not be dropped.
    257             if (*timestampUs < mStartTimeUs) {
    258                 ALOGI("set timestampUs to start time stamp %lld us", mStartTimeUs);
    259                 *timestampUs = mStartTimeUs;
    260             }
    261             return false;
    262         }
    263     }
    264 
    265     // Workaround to bypass the first 2 input frames for skipping.
    266     // The first 2 output frames from the encoder are: decoder specific info and
    267     // the compressed video frame data for the first input video frame.
    268     if (mNumFramesEncoded >= 1 && *timestampUs <
    269         (mLastTimeLapseFrameRealTimestampUs + mTimeBetweenFrameCaptureUs)) {
    270         // Skip all frames from last encoded frame until
    271         // sufficient time (mTimeBetweenFrameCaptureUs) has passed.
    272         // Tell the camera to release its recording frame and return.
    273         ALOGV("dataCallbackTimestamp timelapse: skipping intermediate frame");
    274         return true;
    275     } else {
    276         // Desired frame has arrived after mTimeBetweenFrameCaptureUs time:
    277         // - Reset mLastTimeLapseFrameRealTimestampUs to current time.
    278         // - Artificially modify timestampUs to be one frame time (1/framerate) ahead
    279         // of the last encoded frame's time stamp.
    280         ALOGV("dataCallbackTimestamp timelapse: got timelapse frame");
    281 
    282         mLastTimeLapseFrameRealTimestampUs = *timestampUs;
    283         *timestampUs = mLastFrameTimestampUs + mTimeBetweenTimeLapseVideoFramesUs;
    284         return false;
    285     }
    286     return false;
    287 }
    288 
    289 void CameraSourceTimeLapse::dataCallbackTimestamp(int64_t timestampUs, int32_t msgType,
    290             const sp<IMemory> &data) {
    291     ALOGV("dataCallbackTimestamp");
    292     mSkipCurrentFrame = skipFrameAndModifyTimeStamp(&timestampUs);
    293     CameraSource::dataCallbackTimestamp(timestampUs, msgType, data);
    294 }
    295 
    296 }  // namespace android
    297