Provide sample timestamps and subsample offset for Splice info

This will allow recreating timestamp adjustment on the decoding side.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=144692956

library/src/main/java/com/google/android/exoplayer2/Format.java

@@ -330,6 +330,13 @@ public static Format createContainerFormat(String id, String containerMimeType,
         NO_VALUE, NO_VALUE, 0, null, NO_VALUE, OFFSET_SAMPLE_RELATIVE, null, null, null);
   }
 
+  public static Format createSampleFormat(String id, String sampleMimeType,
+      long subsampleOffsetUs) {
+    return new Format(id, null, sampleMimeType, null, NO_VALUE, NO_VALUE, NO_VALUE, NO_VALUE,
+        NO_VALUE, NO_VALUE, NO_VALUE, null, NO_VALUE, NO_VALUE, NO_VALUE, NO_VALUE, NO_VALUE,
+        NO_VALUE, 0, null, NO_VALUE, subsampleOffsetUs, null, null, null);
+  }
+
   public static Format createSampleFormat(String id, String sampleMimeType, String codecs,
       int bitrate, DrmInitData drmInitData) {
     return new Format(id, null, sampleMimeType, codecs, bitrate, NO_VALUE, NO_VALUE, NO_VALUE,

library/src/main/java/com/google/android/exoplayer2/extractor/TimestampAdjuster.java

@@ -51,6 +51,34 @@ public TimestampAdjuster(long firstSampleTimestampUs) {
     lastSampleTimestamp = C.TIME_UNSET;
   }
 
+  /**
+   * Returns the last adjusted timestamp. If no timestamp has been adjusted, returns
+   * {@code firstSampleTimestampUs} as provided to the constructor. If this value is
+   * {@link #DO_NOT_OFFSET}, returns {@link C#TIME_UNSET}.
+   *
+   * @return The last adjusted timestamp. If not present, {@code firstSampleTimestampUs} is
+   *     returned unless equal to {@link #DO_NOT_OFFSET}, in which case {@link C#TIME_UNSET} is
+   *     returned.
+   */
+  public long getLastAdjustedTimestampUs() {
+    return lastSampleTimestamp != C.TIME_UNSET ? lastSampleTimestamp
+        : firstSampleTimestampUs != DO_NOT_OFFSET ? firstSampleTimestampUs : C.TIME_UNSET;
+  }
+
+  /**
+   * Returns the offset between the input of {@link #adjustSampleTimestamp(long)} and its output.
+   * If {@link #DO_NOT_OFFSET} was provided to the constructor, 0 is returned. If the timestamp
+   * adjuster is yet not initialized, {@link C#TIME_UNSET} is returned.
+   *
+   * @return The offset between {@link #adjustSampleTimestamp(long)}'s input and output.
+   *     {@link C#TIME_UNSET} if the adjuster is not yet initialized and 0 if timestamps should not
+   *     be offset.
+   */
+  public long getTimestampOffsetUs() {
+    return firstSampleTimestampUs == DO_NOT_OFFSET ? 0
+        : lastSampleTimestamp == C.TIME_UNSET ? C.TIME_UNSET : timestampOffsetUs;
+  }
+
   /**
    * Resets the instance to its initial state.
    */

library/src/main/java/com/google/android/exoplayer2/extractor/ts/SpliceInfoSectionReader.java

@@ -28,21 +28,34 @@
  */
 public final class SpliceInfoSectionReader implements SectionPayloadReader {
 
+  private TimestampAdjuster timestampAdjuster;
   private TrackOutput output;
+  private boolean formatDeclared;
 
   @Override
   public void init(TimestampAdjuster timestampAdjuster, ExtractorOutput extractorOutput,
       TsPayloadReader.TrackIdGenerator idGenerator) {
+    this.timestampAdjuster = timestampAdjuster;
     output = extractorOutput.track(idGenerator.getNextId());
     output.format(Format.createSampleFormat(null, MimeTypes.APPLICATION_SCTE35, null,
         Format.NO_VALUE, null));
   }
 
   @Override
   public void consume(ParsableByteArray sectionData) {
+    if (!formatDeclared) {
+      if (timestampAdjuster.getTimestampOffsetUs() == C.TIME_UNSET) {
+        // There is not enough information to initialize the timestamp adjuster.
+        return;
+      }
+      output.format(Format.createSampleFormat(null, MimeTypes.APPLICATION_SCTE35,
+          timestampAdjuster.getTimestampOffsetUs()));
+      formatDeclared = true;
+    }
     int sampleSize = sectionData.bytesLeft();
     output.sampleData(sectionData, sampleSize);
-    output.sampleMetadata(0, C.BUFFER_FLAG_KEY_FRAME, sampleSize, 0, null);
+    output.sampleMetadata(timestampAdjuster.getLastAdjustedTimestampUs(), C.BUFFER_FLAG_KEY_FRAME,
+        sampleSize, 0, null);
   }
 
 }