Update image transcoding pipeline to signal input COLOR_TRANSFER_SRGB

The production code changes are in transformer, but the tests in effect have also been updated to confirm the is no color regression `inputColorInfo.colorTransfer=C.COLOR_TRANSFER_SRGB`

PiperOrigin-RevId: 526950435

library/common/src/main/java/com/google/android/exoplayer2/video/ColorInfo.java

@@ -135,7 +135,7 @@ public final class ColorInfo implements Bundleable {
    * Color info representing SDR sRGB in accordance with {@link
    * android.hardware.DataSpace#DATASPACE_SRGB}, which is a common SDR image color format.
    */
-  public static final ColorInfo SRGB_FULL =
+  public static final ColorInfo SRGB_BT709_FULL =
       new ColorInfo.Builder()
           .setColorSpace(C.COLOR_SPACE_BT709)
           .setColorRange(C.COLOR_RANGE_FULL)

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

@@ -23,6 +23,7 @@ import static com.google.common.truth.Truth.assertThat;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.testutil.VideoFrameProcessorTestRunner;
+import com.google.android.exoplayer2.video.ColorInfo;
 import java.util.Queue;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -126,6 +127,7 @@ public class DefaultVideoFrameProcessorImageFrameOutputTest {
         .setTestId(testId)
         .setVideoFrameProcessorFactory(new DefaultVideoFrameProcessor.Factory.Builder().build())
         .setInputType(INPUT_TYPE_BITMAP)
+        .setInputColorInfo(ColorInfo.SRGB_BT709_FULL)
         .setOnOutputFrameAvailableListener(
             unused -> checkNotNull(framesProduced).incrementAndGet());
   }

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

@@ -33,6 +33,7 @@ import com.google.android.exoplayer2.testutil.VideoFrameProcessorTestRunner;
 import com.google.android.exoplayer2.util.Effect;
 import com.google.android.exoplayer2.util.Size;
 import com.google.android.exoplayer2.util.VideoFrameProcessingException;
+import com.google.android.exoplayer2.video.ColorInfo;
 import com.google.common.collect.ImmutableList;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.junit.After;
@@ -111,7 +112,10 @@ public final class DefaultVideoFrameProcessorPixelTest {
   public void noEffects_withImageInput_matchesGoldenFile() throws Exception {
     String testId = "noEffects_withImageInput_matchesGoldenFile";
     videoFrameProcessorTestRunner =
-        getDefaultFrameProcessorTestRunnerBuilder(testId).setInputType(INPUT_TYPE_BITMAP).build();
+        getDefaultFrameProcessorTestRunnerBuilder(testId)
+            .setInputType(INPUT_TYPE_BITMAP)
+            .setInputColorInfo(ColorInfo.SRGB_BT709_FULL)
+            .build();
     Bitmap originalBitmap = readBitmap(IMAGE_PNG_ASSET_PATH);
     Bitmap expectedBitmap = readBitmap(IMAGE_TO_VIDEO_PNG_ASSET_PATH);
 
@@ -131,6 +135,7 @@ public final class DefaultVideoFrameProcessorPixelTest {
     videoFrameProcessorTestRunner =
         getDefaultFrameProcessorTestRunnerBuilder(testId)
             .setInputType(INPUT_TYPE_BITMAP)
+            .setInputColorInfo(ColorInfo.SRGB_BT709_FULL)
             .setEffects(
                 new GlEffectWrapper(
                     new Crop(

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/ImageAssetLoader.java

@@ -36,6 +36,7 @@ import com.google.android.exoplayer2.upstream.DataSourceBitmapLoader;
 import com.google.android.exoplayer2.upstream.DefaultDataSource;
 import com.google.android.exoplayer2.util.BitmapLoader;
 import com.google.android.exoplayer2.util.MimeTypes;
+import com.google.android.exoplayer2.video.ColorInfo;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.Futures;
@@ -113,6 +114,7 @@ public final class ImageAssetLoader implements AssetLoader {
                       .setHeight(bitmap.getHeight())
                       .setWidth(bitmap.getWidth())
                       .setSampleMimeType(MIME_TYPE_IMAGE_ALL)
+                      .setColorInfo(ColorInfo.SRGB_BT709_FULL)
                       .build();
               listener.onTrackAdded(format, SUPPORTED_OUTPUT_TYPE_DECODED);
               scheduledExecutorService.submit(() -> queueBitmapInternal(bitmap, format));

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/VideoSamplePipeline.java

@@ -25,6 +25,7 @@ import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.VideoFrameProcessor.INPUT_TYPE_BITMAP;
 import static com.google.android.exoplayer2.util.VideoFrameProcessor.INPUT_TYPE_SURFACE;
 import static com.google.android.exoplayer2.video.ColorInfo.SDR_BT709_LIMITED;
+import static com.google.android.exoplayer2.video.ColorInfo.SRGB_BT709_FULL;
 import static com.google.android.exoplayer2.video.ColorInfo.isTransferHdr;
 
 import android.content.Context;
@@ -123,17 +124,25 @@ import org.checkerframework.dataflow.qual.Pure;
     boolean isGlToneMapping =
         ColorInfo.isTransferHdr(decoderInputColor)
             && transformationRequest.hdrMode == HDR_MODE_TONE_MAP_HDR_TO_SDR_USING_OPEN_GL;
-    // For consistency with the Android platform, OpenGL tone mapping outputs colors with
-    // C.COLOR_TRANSFER_GAMMA_2_2 instead of C.COLOR_TRANSFER_SDR, and outputs this as
-    // C.COLOR_TRANSFER_SDR to the encoder.
-    ColorInfo videoFrameProcessorOutputColor =
-        isGlToneMapping
-            ? new ColorInfo.Builder()
-                .setColorSpace(C.COLOR_SPACE_BT709)
-                .setColorRange(C.COLOR_RANGE_LIMITED)
-                .setColorTransfer(C.COLOR_TRANSFER_GAMMA_2_2)
-                .build()
-            : videoFrameProcessorInputColor;
+    ColorInfo videoFrameProcessorOutputColor;
+    if (videoFrameProcessorInputColor.colorTransfer == C.COLOR_TRANSFER_SRGB) {
+      // The sRGB color transfer is only used for images, so when an image gets transcoded into a
+      // video, we use the SMPTE 170M transfer function for the resulting video.
+      videoFrameProcessorOutputColor = SDR_BT709_LIMITED;
+    } else if (isGlToneMapping) {
+      // For consistency with the Android platform, OpenGL tone mapping outputs colors with
+      // C.COLOR_TRANSFER_GAMMA_2_2 instead of C.COLOR_TRANSFER_SDR, and outputs this as
+      // C.COLOR_TRANSFER_SDR to the encoder.
+      videoFrameProcessorOutputColor =
+          new ColorInfo.Builder()
+              .setColorSpace(C.COLOR_SPACE_BT709)
+              .setColorRange(C.COLOR_RANGE_LIMITED)
+              .setColorTransfer(C.COLOR_TRANSFER_GAMMA_2_2)
+              .build();
+    } else {
+      videoFrameProcessorOutputColor = videoFrameProcessorInputColor;
+    }
+
     List<Effect> effectsWithPresentation = new ArrayList<>(effects);
     if (presentation != null) {
       effectsWithPresentation.add(presentation);
@@ -409,6 +418,9 @@ import org.checkerframework.dataflow.qual.Pure;
         // populate default color info, which depends on the resolution.
         return ColorInfo.SDR_BT709_LIMITED;
       }
+      if (SRGB_BT709_FULL.equals(inputFormat.colorInfo)) {
+        return ColorInfo.SDR_BT709_LIMITED;
+      }
       return checkNotNull(inputFormat.colorInfo);
     }