Image frame processing color transfer fix

Used an actual captured image with set color profile for test to minimise the chance of the test flaking. Also renamed the media/bitmap/overlay folder to media/bitmap/input_images for clarity.

PiperOrigin-RevId: 513273353

library/effect/src/androidTest/java/com/google/android/exoplayer2/effect/DefaultVideoFrameProcessorImageFrameOutputTest.java

@@ -38,8 +38,8 @@ import org.junit.runner.RunWith;
 public class DefaultVideoFrameProcessorImageFrameOutputTest {
   public static final String ORIGINAL_PNG_ASSET_PATH =
       "media/bitmap/sample_mp4_first_frame/electrical_colors/original.png";
-  public static final String WRAPPED_CROP_PNG_ASSET_PATH =
-      "media/bitmap/sample_mp4_first_frame/electrical_colors/image_input_with_wrapped_crop.png";
+  public static final String SCALE_WIDE_PNG_ASSET_PATH =
+      "media/bitmap/sample_mp4_first_frame/electrical_colors/scale_wide.png";
   public static final String BITMAP_OVERLAY_PNG_ASSET_PATH =
       "media/bitmap/sample_mp4_first_frame/electrical_colors/overlay_bitmap_FrameProcessor.png";
 
@@ -66,7 +66,7 @@ public class DefaultVideoFrameProcessorImageFrameOutputTest {
     videoFrameProcessorTestRunner.queueInputBitmap(
         readBitmap(ORIGINAL_PNG_ASSET_PATH), C.MICROS_PER_SECOND, /* frameRate= */ 2);
     videoFrameProcessorTestRunner.queueInputBitmap(
-        readBitmap(WRAPPED_CROP_PNG_ASSET_PATH), 2 * C.MICROS_PER_SECOND, /* frameRate= */ 3);
+        readBitmap(SCALE_WIDE_PNG_ASSET_PATH), 2 * C.MICROS_PER_SECOND, /* frameRate= */ 3);
     videoFrameProcessorTestRunner.queueInputBitmap(
         readBitmap(BITMAP_OVERLAY_PNG_ASSET_PATH), 3 * C.MICROS_PER_SECOND, /* frameRate= */ 4);
     videoFrameProcessorTestRunner.endFrameProcessingAndGetImage();

library/effect/src/androidTest/java/com/google/android/exoplayer2/effect/DefaultVideoFrameProcessorPixelTest.java

@@ -54,8 +54,11 @@ import org.junit.runner.RunWith;
 public final class DefaultVideoFrameProcessorPixelTest {
   public static final String ORIGINAL_PNG_ASSET_PATH =
       "media/bitmap/sample_mp4_first_frame/electrical_colors/original.png";
-  public static final String WRAPPED_CROP_PNG_ASSET_PATH =
-      "media/bitmap/sample_mp4_first_frame/electrical_colors/image_input_with_wrapped_crop.png";
+  public static final String IMAGE_PNG_ASSET_PATH = "media/bitmap/input_images/london.jpg";
+  public static final String IMAGE_TO_VIDEO_PNG_ASSET_PATH =
+      "media/bitmap/sample_mp4_first_frame/electrical_colors/london_image_to_video.png";
+  public static final String IMAGE_TO_CROPPED_VIDEO_PNG_ASSET_PATH =
+      "media/bitmap/sample_mp4_first_frame/electrical_colors/london_image_to_video_with_crop.png";
   public static final String BITMAP_OVERLAY_PNG_ASSET_PATH =
       "media/bitmap/sample_mp4_first_frame/electrical_colors/overlay_bitmap_FrameProcessor.png";
   public static final String SCALE_WIDE_PNG_ASSET_PATH =
@@ -108,10 +111,11 @@ public final class DefaultVideoFrameProcessorPixelTest {
     String testId = "noEffects_withImageInput_matchesGoldenFile";
     videoFrameProcessorTestRunner =
         getDefaultFrameProcessorTestRunnerBuilder(testId).setIsInputTextureExternal(false).build();
-    Bitmap expectedBitmap = readBitmap(ORIGINAL_PNG_ASSET_PATH);
+    Bitmap originalBitmap = readBitmap(IMAGE_PNG_ASSET_PATH);
+    Bitmap expectedBitmap = readBitmap(IMAGE_TO_VIDEO_PNG_ASSET_PATH);
 
     videoFrameProcessorTestRunner.queueInputBitmap(
-        expectedBitmap, C.MICROS_PER_SECOND, /* frameRate= */ 1);
+        originalBitmap, C.MICROS_PER_SECOND, /* frameRate= */ 1);
     Bitmap actualBitmap = videoFrameProcessorTestRunner.endFrameProcessingAndGetImage();
 
     // TODO(b/207848601): Switch to using proper tooling for testing against golden data.
@@ -134,8 +138,8 @@ public final class DefaultVideoFrameProcessorPixelTest {
                         /* bottom= */ -0.5f,
                         /* top= */ 0.5f)))
             .build();
-    Bitmap originalBitmap = readBitmap(ORIGINAL_PNG_ASSET_PATH);
-    Bitmap expectedBitmap = readBitmap(WRAPPED_CROP_PNG_ASSET_PATH);
+    Bitmap originalBitmap = readBitmap(IMAGE_PNG_ASSET_PATH);
+    Bitmap expectedBitmap = readBitmap(IMAGE_TO_CROPPED_VIDEO_PNG_ASSET_PATH);
 
     videoFrameProcessorTestRunner.queueInputBitmap(
         originalBitmap, C.MICROS_PER_SECOND, /* frameRate= */ 1);

library/effect/src/androidTest/java/com/google/android/exoplayer2/effect/OverlayShaderProgramPixelTest.java

@@ -58,7 +58,7 @@ import org.junit.runner.RunWith;
  */
 @RunWith(AndroidJUnit4.class)
 public class OverlayShaderProgramPixelTest {
-  public static final String OVERLAY_PNG_ASSET_PATH = "media/bitmap/overlay/media3test.png";
+  public static final String OVERLAY_PNG_ASSET_PATH = "media/bitmap/input_images/media3test.png";
   public static final String ORIGINAL_PNG_ASSET_PATH =
       "media/bitmap/sample_mp4_first_frame/electrical_colors/original.png";
   public static final String OVERLAY_BITMAP_DEFAULT =

library/effect/src/main/assets/shaders/fragment_shader_transformation_sdr_internal_es2.glsl

@@ -36,22 +36,23 @@ uniform int uOutputColorTransfer;
 const float inverseGamma = 0.4500;
 const float gamma = 1.0 / inverseGamma;
 
-// Transforms a single channel from electrical to optical SDR using the SMPTE 
-// 170M OETF.
-float smpte170mEotfSingleChannel(float electricalChannel) {
+// Transforms a single channel from electrical to optical SDR using the sRGB
+// EOTF.
+float srgbEotfSingleChannel(float electricalChannel) {
   // Specification:
-  // https://www.itu.int/rec/R-REC-BT.1700-0-200502-I/en
-  return electricalChannel < 0.0812
-    ? electricalChannel / 4.500
-    : pow((electricalChannel + 0.099) / 1.099, gamma);
+  // https://developer.android.com/ndk/reference/group/a-data-space#group___a_data_space_1gga2759ad19cae46646cc5f7002758c4a1cac1bef6aa3a72abbf4a651a0bfb117f96
+  return electricalChannel <= 0.04045
+    ? electricalChannel / 12.92
+    : pow((electricalChannel + 0.055) / 1.055, 2.4);
 }
 
-// Transforms electrical to optical SDR using the SMPTE 170M EOTF.
-vec3 smpte170mEotf(vec3 electricalColor) {
+// Transforms electrical to optical SDR using the sRGB EOTF.
+vec3 srgbEotf(const vec3 electricalColor) {
   return vec3(
-    smpte170mEotfSingleChannel(electricalColor.r),
-    smpte170mEotfSingleChannel(electricalColor.g),
-    smpte170mEotfSingleChannel(electricalColor.b));
+    srgbEotfSingleChannel(electricalColor.r),
+    srgbEotfSingleChannel(electricalColor.g),
+    srgbEotfSingleChannel(electricalColor.b)
+  );
 }
 
 // Transforms a single channel from optical to electrical SDR.
@@ -95,7 +96,7 @@ void main() {
   // texture gets flipped. We flip the texture vertically to ensure the
   // orientation of the output is correct.
   vec4 inputColor = texture2D(uTexSampler, vTexSamplingCoordFlipped);
-  vec3 linearInputColor = smpte170mEotf(inputColor.rgb);
+  vec3 linearInputColor = srgbEotf(inputColor.rgb);
 
   vec4 transformedColors = uRgbMatrix * vec4(linearInputColor, 1);
 

testdata/src/test/assets/media/bitmap/input_images/README.md

+All the files are in the *sRGB color space* specified in IEC 61966-2-1 following the colorspace 
+model that is supported by [android.graphics.Bitmap](https://developer.android.com/reference/android/graphics/BitmapFactory.Options#inPreferredColorSpace).