Factor out RTP timestamp to sample time method

PiperOrigin-RevId: 465337074

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpAacReader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 
 import com.google.android.exoplayer2.C;
@@ -153,14 +154,4 @@ private static void outputSampleMetadata(TrackOutput trackOutput, long sampleTim
     trackOutput.sampleMetadata(
         sampleTimeUs, C.BUFFER_FLAG_KEY_FRAME, size, /* offset= */ 0, /* cryptoData= */ null);
   }
-
-  /** Returns the correct sample time from RTP timestamp, accounting for the AAC sampling rate. */
-  private static long toSampleTimeUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp, int sampleRate) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            rtpTimestamp - firstReceivedRtpTimestamp,
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ sampleRate);
-  }
 }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpAc3Reader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.Assertions.checkState;
 import static com.google.android.exoplayer2.util.Util.castNonNull;
@@ -26,7 +27,6 @@
 import com.google.android.exoplayer2.source.rtsp.RtpPayloadFormat;
 import com.google.android.exoplayer2.util.ParsableBitArray;
 import com.google.android.exoplayer2.util.ParsableByteArray;
-import com.google.android.exoplayer2.util.Util;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 /** Parses an AC3 byte stream carried on RTP packets, and extracts AC3 frames. */
@@ -206,14 +206,4 @@ private void outputSampleMetadataForFragmentedPackets() {
             /* cryptoData= */ null);
     numBytesPendingMetadataOutput = 0;
   }
-
-  /** Returns the correct sample time from RTP timestamp, accounting for the AC3 sampling rate. */
-  private static long toSampleTimeUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp, int sampleRate) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            rtpTimestamp - firstReceivedRtpTimestamp,
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ sampleRate);
-  }
 }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpAmrReader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkArgument;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.Assertions.checkStateNotNull;
@@ -183,14 +184,4 @@ public static int getFrameSize(int frameType, boolean isWideBand) {
         ? AMR_WB_FRAME_TYPE_INDEX_TO_FRAME_SIZE[frameType]
         : AMR_NB_FRAME_TYPE_INDEX_TO_FRAME_SIZE[frameType];
   }
-
-  /** Returns the correct sample time from RTP timestamp, accounting for the AMR sampling rate. */
-  private static long toSampleTimeUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp, int sampleRate) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            rtpTimestamp - firstReceivedRtpTimestamp,
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ sampleRate);
-  }
 }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpH263Reader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.Assertions.checkState;
 import static com.google.android.exoplayer2.util.Assertions.checkStateNotNull;
@@ -35,7 +36,7 @@
 /* package */ final class RtpH263Reader implements RtpPayloadReader {
   private static final String TAG = "RtpH263Reader";
 
-  private static final long MEDIA_CLOCK_FREQUENCY = 90_000;
+  private static final int MEDIA_CLOCK_FREQUENCY = 90_000;
 
   /** I-frame VOP unit type. */
   private static final int I_VOP = 0;
@@ -164,7 +165,8 @@ public void consume(
     // Write the video sample.
     trackOutput.sampleData(data, fragmentSize);
     fragmentedSampleSizeBytes += fragmentSize;
-    fragmentedSampleTimeUs = toSampleUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp);
+    fragmentedSampleTimeUs =
+        toSampleTimeUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp, MEDIA_CLOCK_FREQUENCY);
 
     if (rtpMarker) {
       outputSampleMetadataForFragmentedPackets();
@@ -242,13 +244,4 @@ private void outputSampleMetadataForFragmentedPackets() {
     isKeyFrame = false;
     gotFirstPacketOfH263Frame = false;
   }
-
-  private static long toSampleUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            (rtpTimestamp - firstReceivedRtpTimestamp),
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ MEDIA_CLOCK_FREQUENCY);
-  }
 }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpH264Reader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.Assertions.checkStateNotNull;
 import static com.google.android.exoplayer2.util.Util.castNonNull;
@@ -36,7 +37,7 @@
 /* package */ final class RtpH264Reader implements RtpPayloadReader {
   private static final String TAG = "RtpH264Reader";
 
-  private static final long MEDIA_CLOCK_FREQUENCY = 90_000;
+  private static final int MEDIA_CLOCK_FREQUENCY = 90_000;
 
   /** Offset of payload data within a FU type A payload. */
   private static final int FU_PAYLOAD_OFFSET = 2;
@@ -115,7 +116,9 @@ public void consume(ParsableByteArray data, long timestamp, int sequenceNumber,
         firstReceivedTimestamp = timestamp;
       }
 
-      long timeUs = toSampleUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp);
+      long timeUs =
+          toSampleTimeUs(
+              startTimeOffsetUs, timestamp, firstReceivedTimestamp, MEDIA_CLOCK_FREQUENCY);
       trackOutput.sampleMetadata(
           timeUs, bufferFlags, fragmentedSampleSizeBytes, /* offset= */ 0, /* cryptoData= */ null);
       fragmentedSampleSizeBytes = 0;
@@ -287,15 +290,6 @@ private int writeStartCode() {
     return bytesWritten;
   }
 
-  private static long toSampleUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            (rtpTimestamp - firstReceivedRtpTimestamp),
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ MEDIA_CLOCK_FREQUENCY);
-  }
-
   private static @C.BufferFlags int getBufferFlagsFromNalType(int nalType) {
     return nalType == NAL_UNIT_TYPE_IDR ? C.BUFFER_FLAG_KEY_FRAME : 0;
   }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpH265Reader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.Assertions.checkStateNotNull;
 
@@ -38,7 +39,7 @@
 /* package */ final class RtpH265Reader implements RtpPayloadReader {
 
   private static final String TAG = "RtpH265Reader";
-  private static final long MEDIA_CLOCK_FREQUENCY = 90_000;
+  private static final int MEDIA_CLOCK_FREQUENCY = 90_000;
   /** Offset of payload data within a FU payload. */
   private static final int FU_PAYLOAD_OFFSET = 3;
   /** Aggregation Packet. RFC7798 Section 4.4.2. */
@@ -111,7 +112,9 @@ public void consume(ParsableByteArray data, long timestamp, int sequenceNumber,
         firstReceivedTimestamp = timestamp;
       }
 
-      long timeUs = toSampleUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp);
+      long timeUs =
+          toSampleTimeUs(
+              startTimeOffsetUs, timestamp, firstReceivedTimestamp, MEDIA_CLOCK_FREQUENCY);
       trackOutput.sampleMetadata(
           timeUs, bufferFlags, fragmentedSampleSizeBytes, /* offset= */ 0, /* cryptoData= */ null);
       fragmentedSampleSizeBytes = 0;
@@ -254,15 +257,6 @@ private int writeStartCode() {
     return bytesWritten;
   }
 
-  private static long toSampleUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            (rtpTimestamp - firstReceivedRtpTimestamp),
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ MEDIA_CLOCK_FREQUENCY);
-  }
-
   private static @C.BufferFlags int getBufferFlagsFromNalType(int nalType) {
     return (nalType == NAL_IDR_W_RADL || nalType == NAL_IDR_N_LP) ? C.BUFFER_FLAG_KEY_FRAME : 0;
   }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpMpeg4Reader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkStateNotNull;
 import static com.google.android.exoplayer2.util.Util.castNonNull;
 
@@ -36,7 +37,7 @@
 /* package */ final class RtpMpeg4Reader implements RtpPayloadReader {
   private static final String TAG = "RtpMpeg4Reader";
 
-  private static final long MEDIA_CLOCK_FREQUENCY = 90_000;
+  private static final int MEDIA_CLOCK_FREQUENCY = 90_000;
 
   /** VOP (Video Object Plane) unit type. */
   private static final int I_VOP = 0;
@@ -102,7 +103,9 @@ public void consume(
         firstReceivedTimestamp = timestamp;
       }
 
-      long timeUs = toSampleUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp);
+      long timeUs =
+          toSampleTimeUs(
+              startTimeOffsetUs, timestamp, firstReceivedTimestamp, MEDIA_CLOCK_FREQUENCY);
       trackOutput.sampleMetadata(timeUs, bufferFlags, sampleLength, 0, null);
       sampleLength = 0;
     }
@@ -135,13 +138,4 @@ public void seek(long nextRtpTimestamp, long timeUs) {
     }
     return 0;
   }
-
-  private static long toSampleUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            (rtpTimestamp - firstReceivedRtpTimestamp),
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ MEDIA_CLOCK_FREQUENCY);
-  }
 }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpOpusReader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkArgument;
 import static com.google.android.exoplayer2.util.Assertions.checkStateNotNull;
 
@@ -38,7 +39,7 @@
 /* package */ final class RtpOpusReader implements RtpPayloadReader {
   private static final String TAG = "RtpOpusReader";
   /* Opus uses a fixed 48KHz media clock RFC7845 Section 4. */
-  private static final long MEDIA_CLOCK_FREQUENCY = 48_000;
+  private static final int MEDIA_CLOCK_FREQUENCY = 48_000;
 
   private final RtpPayloadFormat payloadFormat;
 
@@ -113,7 +114,9 @@ public void consume(
       // sending opus data.
       int size = data.bytesLeft();
       trackOutput.sampleData(data, size);
-      long timeUs = toSampleTimeUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp);
+      long timeUs =
+          toSampleTimeUs(
+              startTimeOffsetUs, timestamp, firstReceivedTimestamp, MEDIA_CLOCK_FREQUENCY);
       trackOutput.sampleMetadata(
           timeUs, C.BUFFER_FLAG_KEY_FRAME, size, /* offset*/ 0, /* cryptoData*/ null);
     }
@@ -144,14 +147,4 @@ private static void validateOpusIdHeader(ParsableByteArray data) {
     checkArgument(data.readUnsignedByte() == 1, "version number must always be 1");
     data.setPosition(currPosition);
   }
-
-  /** Returns the correct sample time from RTP timestamp, accounting for the OPUS sampling rate. */
-  private static long toSampleTimeUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            rtpTimestamp - firstReceivedRtpTimestamp,
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ MEDIA_CLOCK_FREQUENCY);
-  }
 }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpPcmReader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.source.rtsp.reader;
 
+import static com.google.android.exoplayer2.source.rtsp.reader.RtpReaderUtils.toSampleTimeUs;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 
 import android.util.Log;
@@ -76,7 +77,8 @@ public void consume(
     }
 
     long sampleTimeUs =
-        toSampleUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp, payloadFormat.clockRate);
+        toSampleTimeUs(
+            startTimeOffsetUs, timestamp, firstReceivedTimestamp, payloadFormat.clockRate);
     int size = data.bytesLeft();
     trackOutput.sampleData(data, size);
     trackOutput.sampleMetadata(
@@ -91,14 +93,4 @@ public void seek(long nextRtpTimestamp, long timeUs) {
     firstReceivedTimestamp = nextRtpTimestamp;
     startTimeOffsetUs = timeUs;
   }
-
-  /** Returns the correct sample time from RTP timestamp, accounting for the given clock rate. */
-  private static long toSampleUs(
-      long startTimeOffsetUs, long rtpTimestamp, long firstReceivedRtpTimestamp, int clockRate) {
-    return startTimeOffsetUs
-        + Util.scaleLargeTimestamp(
-            rtpTimestamp - firstReceivedRtpTimestamp,
-            /* multiplier= */ C.MICROS_PER_SECOND,
-            /* divisor= */ clockRate);
-  }
 }

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/reader/RtpReaderUtils.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.exoplayer2.source.rtsp.reader;
+
+import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.util.Util;
+
+/** Utility methods for {@link RtpPayloadReader}s. */
+/* package */ class RtpReaderUtils {
+
+  /**
+   * Converts RTP timestamp and media frequency to sample presentation time, in microseconds
+   *
+   * @param startTimeOffsetUs The offset of the RTP timebase, in microseconds.
+   * @param rtpTimestamp The RTP timestamp to convert.
+   * @param firstReceivedRtpTimestamp The first received RTP timestamp.
+   * @param mediaFrequency The media frequency.
+   * @return The calculated sample presentation time, in microseconds.
+   */
+  public static long toSampleTimeUs(
+      long startTimeOffsetUs,
+      long rtpTimestamp,
+      long firstReceivedRtpTimestamp,
+      int mediaFrequency) {
+    return startTimeOffsetUs
+        + Util.scaleLargeTimestamp(
+            rtpTimestamp - firstReceivedRtpTimestamp,
+            /* multiplier= */ C.MICROS_PER_SECOND,
+            /* divisor= */ mediaFrequency);
+  }
+
+  private RtpReaderUtils() {}
+}