CTS测试中testYuvBurst[1]项

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我是靠谱客的博主伶俐高跟鞋，最近开发中收集的这篇文章主要介绍CTS测试中testYuvBurst[1]项，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

（1）源码分析

//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.
     */
    @Test
    public 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.
     */
    @Test
    public 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.
     */
    @Test
    public 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）；
分别创建previewBuilder 和 burstBuilder （都是TEMPLATE_PREVIEW），并为burstBuilder设置CONTROL_AE_TARGET_FPS_RANGE 、CONTROL_AE_LOCK （true）、CONTROL_AWB_LOCK （true）；
开始预览（用resultListener 监听预览结果），并创建100个burst request；
while循环遍历每个resultListener 结果，并检查其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算有效帧，检测：如果前150帧以内都没有检测到有效帧，报failed；
lock住previewBuilder的 CONTROL_AE_LOCK 、CONTROL_AWB_LOCK 、CONTROL_AF_TRIGGER_START，重新预览；
检测此时的sensor setting (burstExposure / burstFrameDuration / burstSensitivity 都要大于0)；
进行burst拍照，检测burstResult（SENSOR_EXPOSURE_TIME和SENSOR_SENSITIVITY），并计算每一侦的frameDurations；
检测平均frameDurations是否小于等于minStillFrameDuration；

简单看一下判断条件：

final float FRAME_DURATION_MARGIN_FRACTION = 0.1f;
//获取的metadata当中的frame duration
final long minStillFrameDuration = config.getOutputMinFrameDuration(fmt, stillSize);

//计算出frameDurationBound
final long frameDurationBound = (long) (minStillFrameDuration * (1 + FRAME_DURATION_MARGIN_FRACTION) );

//计算出平均frameDurations
float meanFrameDuration = (float) meanFrameSum / frameDurations.size();

//判断平均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)

可以看到实际的平均frameDurations = 72727504.0，而frameDurationBound = 50000000 * (1 + 0.1) = 55000000，从而导致frameDurations大于frameDurationBound，进而出现Failed项。

（3）修改方案

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

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

将metadata当中的最大YUV Size的 frame duration由原来的50000000修改成66666666，按照上面的计算公式可得：
72727504.0 < 66666666 * (1 + 0.1) = 73333332.6，进而得到frameDurations <= frameDurationBound，所以可以Pass。