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
32namespace android {
33
34// static
35CameraSourceTimeLapse *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
58CameraSourceTimeLapse::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
89CameraSourceTimeLapse::~CameraSourceTimeLapse() {
90    if (mLastReadBufferCopy) {
91        mLastReadBufferCopy->release();
92        mLastReadBufferCopy = NULL;
93    }
94}
95
96void 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
109bool 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
156void 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
167void 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
182void 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
191status_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
211sp<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
224bool 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
234bool 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
289void 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