diff --git a/tools/chatgui-android/video-tests/src/main/kotlin/android/graphics/ImageFormat.kt b/tools/chatgui-android/video-tests/src/main/kotlin/android/graphics/ImageFormat.kt
new file mode 100644
index 00000000..2e317911
--- /dev/null
+++ b/tools/chatgui-android/video-tests/src/main/kotlin/android/graphics/ImageFormat.kt
@@ -0,0 +1,3 @@
+package android.graphics
+
+object ImageFormat { const val YUV_420_888 = 35 }
diff --git a/tools/chatgui-android/video-tests/src/main/kotlin/android/graphics/SurfaceTexture.kt b/tools/chatgui-android/video-tests/src/main/kotlin/android/graphics/SurfaceTexture.kt
index 23aca170..c3975691 100644
--- a/tools/chatgui-android/video-tests/src/main/kotlin/android/graphics/SurfaceTexture.kt
+++ b/tools/chatgui-android/video-tests/src/main/kotlin/android/graphics/SurfaceTexture.kt
@@ -7,6 +7,7 @@ class SurfaceTexture(val id: Int) {
     var releaseCalls = 0
         private set
     var failures = emptySet<String>()
+    fun setDefaultBufferSize(width: Int, height: Int) { check("buffer" !in failures && width > 0 && height > 0) }
     fun release() {
         releaseCalls++; check("release" !in failures) { "texture release failed" }
         released = true; check("release after" !in failures) { "texture release failed after effect" }