I have a sample app to generate YUV images out of predefined jpeg test data and post it to the ImageWriter in order to mock the Camera API for end2end tests: https://github.com/adjorno/Bitmap2YUV
package com.example.bitmap2yuv
import android.graphics.*
import android.media.ImageWriter
import android.os.Bundle
import android.view.Surface
import android.view.TextureView
import androidx.appcompat.app.AppCompatActivity
import androidx.core.graphics.scale
import androidx.lifecycle.lifecycleScope
import io.github.crow_misia.libyuv.AbgrBuffer
import io.github.crow_misia.libyuv.I420Buffer
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
class MainActivity : AppCompatActivity(), TextureView.SurfaceTextureListener {
private lateinit var textureView: TextureView
private var bitmap: Bitmap? = null
private var imageWriter: ImageWriter? = null
private var yuvBuffer: I420Buffer? = null
private var running = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
textureView = TextureView(this)
textureView.surfaceTextureListener = this
setContentView(textureView)
}
private fun createImageWriter(surface: Surface, width: Int, height: Int) {
yuvBuffer = I420Buffer.allocate(width, height)
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888).apply {
eraseColor(Color.BLUE)
}
val argbBuffer = AbgrBuffer.allocate(width, height)
bitmap?.copyPixelsToBuffer(argbBuffer.asBuffer())
argbBuffer.convertTo(yuvBuffer!!)
imageWriter = ImageWriter.newInstance(surface, 1, ImageFormat.YUV_420_888)
startRendering()
}
private fun startRendering() {
imageWriter?.let { imageWriter ->
yuvBuffer?.let { yuvBuffer ->
running = true
lifecycleScope.launch(Dispatchers.IO) {
while (running) {
delay(1000)
val image = imageWriter.dequeueInputImage()
image.planes[0].buffer.put(yuvBuffer.planeY.buffer)
image.planes[1].buffer.put(yuvBuffer.planeU.buffer)
image.planes[2].buffer.put(yuvBuffer.planeV.buffer)
imageWriter.queueInputImage(image)
}
}
}
}
}
override fun onResume() {
super.onResume()
startRendering()
}
override fun onStop() {
super.onStop()
running = false
}
override fun onSurfaceTextureAvailable(surfaceTexture: SurfaceTexture, width: Int, height: Int) {
createImageWriter(Surface(surfaceTexture), width, height)
}
override fun onSurfaceTextureSizeChanged(p0: SurfaceTexture, p1: Int, p2: Int) {
}
override fun onSurfaceTextureDestroyed(p0: SurfaceTexture): Boolean {
return true
}
override fun onSurfaceTextureUpdated(p0: SurfaceTexture) {
}
}
I am expecting to see the blue screen all the time (with 1 fps), but instead I see that every second frame is replaced with a green screen. How to get rid of it?
