（1）源碼分析

//cts/tests/camera/src/android/hardware/camera2/cts/BurstCaptureTest.java/*** Test YUV burst capture with full-AUTO control.* Also verifies sensor settings operation if READ_SENSOR_SETTINGS is available.*/@Testpublic void testYuvBurst() throws Exception {final int YUV_BURST_SIZE = 100;testBurst(ImageFormat.YUV_420_888, YUV_BURST_SIZE, true/*checkFrameRate*/,false/*testStillBokeh*/);}/*** Test JPEG burst capture with full-AUTO control.** Also verifies sensor settings operation if READ_SENSOR_SETTINGS is available.* Compared to testYuvBurst, this test uses STILL_CAPTURE intent, and exercises path where* enableZsl is enabled.*/@Testpublic void testJpegBurst() throws Exception {final int JPEG_BURST_SIZE = 10;testBurst(ImageFormat.JPEG, JPEG_BURST_SIZE, false/*checkFrameRate*/,false/*testStillBokeh*/);}/*** Test YUV burst capture with full-AUTO control and STILL_CAPTURE bokeh mode.* Also verifies sensor settings operation if READ_SENSOR_SETTINGS is available.*/@Testpublic void testYuvBurstWithStillBokeh() throws Exception {final int YUV_BURST_SIZE = 100;testBurst(ImageFormat.YUV_420_888, YUV_BURST_SIZE, true/*checkFrameRate*/,true/*testStillBokeh*/);}//...

拿到previewSize （最大的preview size，不大于1080P）,拿到stillSize （最大的YUV_420_888 Size）；

拿到maxPipelineDepth （REQUEST_PIPELINE_MAX_DEPTH），拿到maxSyncLatency （SYNC_MAX_LATENCY）；

拿到minStillFrameDuration（stillSize的OutputMinFrameDuration）；

分別創建previewBuilder 和 burstBuilder （都是TEMPLATE_PREVIEW），并為burstBuilder設置CONTROL_AE_TARGET_FPS_RANGE 、CONTROL_AE_LOCK （true）、CONTROL_AWB_LOCK （true）；

開始預覽（用resultListener 監聽預覽結果），并創建100個burst request；

while循環遍歷每個resultListener 結果，并檢查其CONTROL_AE_STATE 、 CONTROL_AWB_STATE，如果aeState 是 AE_STATE_CONVERGED或者AE_STATE_FLASH_REQUIRED ，且awbState 是AWB_STATE_CONVERGED算有效幀，檢測：如果前150幀以內都沒有檢測到有效幀，報failed；

lock住previewBuilder的 CONTROL_AE_LOCK 、CONTROL_AWB_LOCK 、CONTROL_AF_TRIGGER_START，重新預覽；

檢測此時的sensor setting (burstExposure / burstFrameDuration / burstSensitivity 都要大于0)；

進行burst拍照，檢測burstResult（SENSOR_EXPOSURE_TIME和SENSOR_SENSITIVITY），并計算每一偵的frameDurations；

檢測平均frameDurations是否小于等于minStillFrameDuration；

簡單看一下判斷條件：

final float FRAME_DURATION_MARGIN_FRACTION = 0.1f; //獲取的metadata當中的frame duration final long minStillFrameDuration = config.getOutputMinFrameDuration(fmt, stillSize);//計算出frameDurationBound final long frameDurationBound = (long) (minStillFrameDuration * (1 + FRAME_DURATION_MARGIN_FRACTION) );//計算出平均frameDurations float meanFrameDuration = (float) meanFrameSum / frameDurations.size();//判斷平均frameDurations是否小于frameDurationBound assertTrue(String.format("Cam %s: Burst frame duration mean %.1f ns is larger than " +"acceptable, expecting below %d ns, allowing below %d", cameraId,meanFrameDuration, minStillFrameDuration, frameDurationBound),meanFrameDuration <= frameDurationBound);

（2）Failed Demo

03-10 09:39:52.590 19601 19630 E TestRunner: failed: testYuvBurst[1](android.hardware.camera2.cts.BurstCaptureTest) 03-10 09:39:52.590 19601 19630 E TestRunner: ----- begin exception ----- 03-10 09:39:52.591 19601 19630 E TestRunner: junit.framework.AssertionFailedError: Cam 0: Burst frame duration mean 72727504.0 ns is larger than acceptable, expecting below 50000000 ns, allowing below 55000000 03-10 09:39:52.591 19601 19630 E TestRunner: at junit.framework.Assert.fail(Assert.java:50) 03-10 09:39:52.591 19601 19630 E TestRunner: at junit.framework.Assert.assertTrue(Assert.java:20) 03-10 09:39:52.591 19601 19630 E TestRunner: at android.hardware.camera2.cts.BurstCaptureTest.burstTestByCamera(BurstCaptureTest.java:417) 03-10 09:39:52.591 19601 19630 E TestRunner: at android.hardware.camera2.cts.BurstCaptureTest.testBurst(BurstCaptureTest.java:123) 03-10 09:39:52.591 19601 19630 E TestRunner: at android.hardware.camera2.cts.BurstCaptureTest.testYuvBurst(BurstCaptureTest.java:56)

可以看到實際的平均frameDurations = 72727504.0，而frameDurationBound = 50000000 * (1 + 0.1) = 55000000，從而導致frameDurations大于frameDurationBound，進而出現Failed項。

（3）修改方案

在metadata當中修改最大YUV_420_888 Size的frame duration。

CONFIG_ENTRY_VALUE(HAL_PIXEL_FORMAT_BLOB, MINT64) //13mp 4:3CONFIG_ENTRY_VALUE(4160, MINT64) // widthCONFIG_ENTRY_VALUE(3120, MINT64) // heightCONFIG_ENTRY_VALUE(MTK_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT, MINT64) // output//CONFIG_ENTRY_VALUE(50000000, MINT64) // frame durationCONFIG_ENTRY_VALUE(66666666, MINT64) // frame durationCONFIG_ENTRY_VALUE(33333333, MINT64) // stall duration

將metadata當中的最大YUV Size的 frame duration由原來的50000000修改成66666666，按照上面的計算公式可得：
72727504.0 < 66666666 * (1 + 0.1) = 73333332.6，進而得到frameDurations <= frameDurationBound，所以可以Pass。

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