return null if Seek Table is not supported. proguard in flac-extension

extensions/flac/proguard-rules.txt

@@ -15,3 +15,13 @@
 -keep class com.google.android.exoplayer2.metadata.flac.PictureFrame {
     *;
 }
+
+-dontnote com.google.android.exoplayer2.extractor.SeekPoint
+-keepclasseswithmembers class com.google.android.exoplayer2.extractor.SeekPoint {
+  <init>(long, long);
+}
+
+-dontnote com.google.android.exoplayer2.extractor.SeekMap$SeekPoints
+-keepclasseswithmembers class com.google.android.exoplayer2.extractor.SeekMap$SeekPoints {
+  <init>(com.google.android.exoplayer2.extractor.SeekPoint, com.google.android.exoplayer2.extractor.SeekPoint);
+}

extensions/flac/src/main/java/com/google/android/exoplayer2/ext/flac/FlacDecoderJni.java

@@ -221,10 +221,10 @@ import java.nio.ByteBuffer;
    * stream.
    *
    * @param timeUs A seek position in microseconds.
-   * @return The corresponding SeekPoints in the flac seek table or
-   * {@link com.google.android.exoplayer2.extractor.SeekPoint#position} set -1 if the stream doesn't
+   * @return The corresponding SeekPoints in the flac seek table or null if the stream doesn't
    * have a seek table.
    */
+  @Nullable
   public SeekMap.SeekPoints getSeekPoints(long timeUs) {
     return flacGetSeekPoints(nativeDecoderContext, timeUs);
   }

extensions/flac/src/main/java/com/google/android/exoplayer2/ext/flac/FlacExtractor.java

@@ -29,6 +29,7 @@ import com.google.android.exoplayer2.extractor.ExtractorsFactory;
 import com.google.android.exoplayer2.extractor.Id3Peeker;
 import com.google.android.exoplayer2.extractor.PositionHolder;
 import com.google.android.exoplayer2.extractor.SeekMap;
+import com.google.android.exoplayer2.extractor.SeekPoint;
 import com.google.android.exoplayer2.extractor.TrackOutput;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.id3.Id3Decoder;
@@ -341,7 +342,8 @@ public final class FlacExtractor implements Extractor {
 
     @Override
     public SeekPoints getSeekPoints(long timeUs) {
-      return decoderJni.getSeekPoints(timeUs);
+      @Nullable SeekPoints seekPoints = decoderJni.getSeekPoints(timeUs);
+      return seekPoints == null ? new SeekPoints(SeekPoint.START) : seekPoints;
     }
 
     @Override

extensions/flac/src/main/jni/flac_jni.cc

@@ -203,6 +203,7 @@ DECODER_FUNC(jlong, flacGetNextFrameFirstSampleIndex, jlong jContext) {
 DECODER_FUNC(jobject, flacGetSeekPoints, jlong jContext, jlong timeUs) {
   Context *context = reinterpret_cast<Context *>(jContext);
   int64_t *result = context->parser->getSeekPositions(timeUs);
+  if (result != NULL) {
     jclass seekPointClass = env->FindClass("com/google/android/exoplayer2/extractor/SeekPoint");
     jclass seekPointsClass = env->FindClass("com/google/android/exoplayer2/extractor/SeekMap$SeekPoints");
     jmethodID cidSeekPoint = env->GetMethodID(seekPointClass, "<init>", "(JJ)V");
@@ -213,6 +214,9 @@ DECODER_FUNC(jobject, flacGetSeekPoints, jlong jContext, jlong timeUs) {
     env->DeleteLocalRef(jSeekPointFirst);
     env->DeleteLocalRef(jSeekPointSecond);
     return jSeekPoints;
+  } else {
+    return NULL;
+  }
 }
 
 DECODER_FUNC(jstring, flacGetStateString, jlong jContext) {

extensions/flac/src/main/jni/flac_parser.cc

@@ -440,9 +440,8 @@ size_t FLACParser::readBuffer(void *output, size_t output_size) {
 
 int64_t* FLACParser::getSeekPositions(int64_t timeUs) {
   int64_t *result = new int64_t[4];
-  memset(result, -1, sizeof(result));
   if (!mSeekTable) {
-    return result;
+    return NULL;
   }
 
   int64_t sample = (timeUs * getSampleRate()) / 1000000LL;

library/core/proguard-rules.txt

@@ -58,16 +58,6 @@
   <init>(com.google.android.exoplayer2.upstream.DataSource$Factory);
 }
 
--dontnote com.google.android.exoplayer2.extractor.SeekPoint
--keepclasseswithmembers class com.google.android.exoplayer2.extractor.SeekPoint {
-  <init>(long, long);
-}
-
--dontnote com.google.android.exoplayer2.extractor.SeekMap$SeekPoints
--keepclasseswithmembers class com.google.android.exoplayer2.extractor.SeekMap$SeekPoints {
-  <init>(com.google.android.exoplayer2.extractor.SeekPoint, com.google.android.exoplayer2.extractor.SeekPoint);
-}
-
 # Don't warn about checkerframework and Kotlin annotations
 -dontwarn org.checkerframework.**
 -dontwarn kotlin.annotations.jvm.**