Signal container MIME type for JPEGs

Before this change the `Format` on the image track output by the
`JpegExtractor` doesn't have a MIME type.

PiperOrigin-RevId: 381015819

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/jpeg/JpegExtractor.java

@@ -30,6 +30,7 @@ import com.google.android.exoplayer2.extractor.TrackOutput;
 import com.google.android.exoplayer2.extractor.mp4.Mp4Extractor;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.mp4.MotionPhotoMetadata;
+import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.ParsableByteArray;
 import java.io.IOException;
 import java.lang.annotation.Documented;
@@ -273,7 +274,10 @@ public final class JpegExtractor implements Extractor {
     TrackOutput imageTrackOutput =
         checkNotNull(extractorOutput).track(IMAGE_TRACK_ID, C.TRACK_TYPE_IMAGE);
     imageTrackOutput.format(
-        new Format.Builder().setMetadata(new Metadata(metadataEntries)).build());
+        new Format.Builder()
+            .setContainerMimeType(MimeTypes.IMAGE_JPEG)
+            .setMetadata(new Metadata(metadataEntries))
+            .build());
   }
 
   /**

testdata/src/test/assets/extractordumps/jpeg/non-motion-photo-shortened.jpg.0.dump

@@ -7,5 +7,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/non-motion-photo-shortened.jpg.unknown_length.dump

@@ -7,5 +7,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-jfif-segment-shortened.jpg.0.dump

@@ -28,5 +28,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[Motion photo metadata: photoStartPosition=0, photoSize=6377, photoPresentationTimestampUs=1232840, videoStartPosition=6377, videoSize=4686]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-jfif-segment-shortened.jpg.1.dump

@@ -28,5 +28,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[Motion photo metadata: photoStartPosition=0, photoSize=6377, photoPresentationTimestampUs=1232840, videoStartPosition=6377, videoSize=4686]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-jfif-segment-shortened.jpg.2.dump

@@ -28,5 +28,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[Motion photo metadata: photoStartPosition=0, photoSize=6377, photoPresentationTimestampUs=1232840, videoStartPosition=6377, videoSize=4686]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-jfif-segment-shortened.jpg.3.dump

@@ -28,5 +28,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[Motion photo metadata: photoStartPosition=0, photoSize=6377, photoPresentationTimestampUs=1232840, videoStartPosition=6377, videoSize=4686]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-jfif-segment-shortened.jpg.unknown_length.dump

@@ -7,5 +7,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-shortened.jpg.0.dump

@@ -8,5 +8,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[Motion photo metadata: photoStartPosition=0, photoSize=131582, photoPresentationTimestampUs=0, videoStartPosition=131582, videoSize=8730]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-shortened.jpg.unknown_length.dump

@@ -7,5 +7,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-video-removed-shortened.jpg.0.dump

@@ -7,5 +7,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/pixel-motion-photo-video-removed-shortened.jpg.unknown_length.dump

@@ -7,5 +7,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/ss-motion-photo-shortened.jpg.0.dump

@@ -8,5 +8,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[Motion photo metadata: photoStartPosition=0, photoSize=20345, photoPresentationTimestampUs=-9223372036854775807, videoStartPosition=20345, videoSize=2582]
 tracksEnded = true

testdata/src/test/assets/extractordumps/jpeg/ss-motion-photo-shortened.jpg.unknown_length.dump

@@ -7,5 +7,6 @@ track 1024:
   total output bytes = 0
   sample count = 0
   format 0:
+    containerMimeType = image/jpeg
     metadata = entries=[]
 tracksEnded = true