Add support for RTSP VP9

Change-Id: Id658564495af13c35fa78ecde9ab587557aabb47

libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtpPayloadFormat.java

@@ -40,6 +40,7 @@ public final class RtpPayloadFormat {
   private static final String RTP_MEDIA_MPEG4_GENERIC = "MPEG4-GENERIC";
   private static final String RTP_MEDIA_H264 = "H264";
   private static final String RTP_MEDIA_H265 = "H265";
+  private static final String RTP_MEDIA_VP9 = "VP9";
 
   /** Returns whether the format of a {@link MediaDescription} is supported. */
   public static boolean isFormatSupported(MediaDescription mediaDescription) {
@@ -48,6 +49,7 @@ public final class RtpPayloadFormat {
       case RTP_MEDIA_H264:
       case RTP_MEDIA_H265:
       case RTP_MEDIA_MPEG4_GENERIC:
+      case RTP_MEDIA_VP9:
         return true;
       default:
         return false;
@@ -71,6 +73,8 @@ public final class RtpPayloadFormat {
         return MimeTypes.VIDEO_H265;
       case RTP_MEDIA_MPEG4_GENERIC:
         return MimeTypes.AUDIO_AAC;
+      case RTP_MEDIA_VP9:
+        return MimeTypes.VIDEO_VP9;
       default:
         throw new IllegalArgumentException(mediaType);
     }

libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspMediaTrack.java

@@ -56,6 +56,10 @@ import com.google.common.collect.ImmutableMap;
 
   private static final String GENERIC_CONTROL_ATTR = "*";
 
+  /** Default width and height for VP9. */
+  private static final int DEFAULT_VP9_WIDTH = 320;
+  private static final int DEFAULT_VP9_HEIGHT = 240;
+
   /** The track's associated {@link RtpPayloadFormat}. */
   public final RtpPayloadFormat payloadFormat;
   /** The track's URI. */
@@ -129,6 +133,10 @@ import com.google.common.collect.ImmutableMap;
         checkArgument(!fmtpParameters.isEmpty());
         processH265FmtpAttribute(formatBuilder, fmtpParameters);
         break;
+      case MimeTypes.VIDEO_VP9:
+        // VP9 does not require a FMTP attribute. So Setting default width and height.
+        formatBuilder.setWidth(DEFAULT_VP9_WIDTH).setHeight(DEFAULT_VP9_HEIGHT);
+        break;
       case MimeTypes.AUDIO_AC3:
         // AC3 does not require a FMTP attribute. Fall through.
       default:

libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/reader/DefaultRtpPayloadReaderFactory.java

@@ -40,6 +40,8 @@ import androidx.media3.exoplayer.rtsp.RtpPayloadFormat;
         return new RtpH264Reader(payloadFormat);
       case MimeTypes.VIDEO_H265:
         return new RtpH265Reader(payloadFormat);
+      case MimeTypes.VIDEO_VP9:
+        return new RtpVP9Reader(payloadFormat);
       default:
         // No supported reader, returning null.
     }

libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/reader/RtpVP9Reader.java

@@ -0,0 +1,230 @@
+/*
+ * 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 androidx.media3.exoplayer.rtsp.reader;
+
+import static androidx.media3.common.util.Assertions.checkArgument;
+import static androidx.media3.common.util.Assertions.checkStateNotNull;
+import static androidx.media3.common.util.Util.castNonNull;
+
+import androidx.media3.common.C;
+import androidx.media3.common.ParserException;
+import androidx.media3.common.util.Log;
+import androidx.media3.common.util.ParsableByteArray;
+import androidx.media3.common.util.Util;
+import androidx.media3.exoplayer.rtsp.RtpPacket;
+import androidx.media3.exoplayer.rtsp.RtpPayloadFormat;
+import androidx.media3.extractor.ExtractorOutput;
+import androidx.media3.extractor.TrackOutput;
+import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
+
+/**
+ * Parses an VP9 byte stream carried on RTP packets, and extracts VP9 Access Units. Refer to
+ * @link https://datatracker.ietf.org/doc/html/draft-ietf-payload-vp9 for more details.
+ */
+/* package */ final class RtpVP9Reader implements RtpPayloadReader {
+
+  private static final String TAG = "RtpVP9Reader";
+
+  private static final long MEDIA_CLOCK_FREQUENCY = 90_000;
+
+  private final RtpPayloadFormat payloadFormat;
+
+  private @MonotonicNonNull TrackOutput trackOutput;
+  @C.BufferFlags private int bufferFlags;
+
+  private long firstReceivedTimestamp;
+  private long startTimeOffsetUs;
+  private static int previousSequenceNumber;
+  /** The combined size of a sample that is fragmented into multiple RTP packets. */
+  private int fragmentedSampleSizeBytes;
+  private static int width;
+  private static int height;
+  private static boolean gotFirstPacketOfVP9Frame;
+  private boolean isKeyFrame;
+  private boolean isOutputFormatSet;
+
+  /** Creates an instance. */
+  public RtpVP9Reader(RtpPayloadFormat payloadFormat) {
+    this.payloadFormat = payloadFormat;
+    firstReceivedTimestamp = C.TIME_UNSET;
+    startTimeOffsetUs = 0;
+    previousSequenceNumber = C.INDEX_UNSET;
+    fragmentedSampleSizeBytes = 0;
+    width = C.INDEX_UNSET;
+    height = C.INDEX_UNSET;
+    gotFirstPacketOfVP9Frame = false;
+    isKeyFrame = false;
+    isOutputFormatSet = false;
+  }
+
+  @Override
+  public void createTracks(ExtractorOutput extractorOutput, int trackId) {
+    trackOutput = extractorOutput.track(trackId, C.TRACK_TYPE_VIDEO);
+    castNonNull(trackOutput).format(payloadFormat.format);
+  }
+
+  @Override
+  public void onReceivingFirstPacket(long timestamp, int sequenceNumber) {}
+
+  @Override
+  public void consume(ParsableByteArray data, long timestamp, int sequenceNumber, boolean rtpMarker)
+      throws ParserException {
+    checkStateNotNull(trackOutput);
+
+    if (parseVP9Descriptor(data, sequenceNumber)) {
+      if (fragmentedSampleSizeBytes == 0 && gotFirstPacketOfVP9Frame) {
+        isKeyFrame = (data.peekUnsignedByte() & 0x04) == 0;
+      }
+
+      if (!isOutputFormatSet && width > 0 && height > 0) {
+        if (width != payloadFormat.format.width || height != payloadFormat.format.height) {
+          trackOutput.format(
+              payloadFormat.format.buildUpon().setWidth(width).setHeight(height).build());
+        }
+        isOutputFormatSet = true;
+      }
+
+      int fragmentSize = data.bytesLeft();
+      // Write the video sample.
+      trackOutput.sampleData(data, fragmentSize);
+      fragmentedSampleSizeBytes += fragmentSize;
+
+      if (rtpMarker) {
+        if (firstReceivedTimestamp == C.TIME_UNSET) {
+          firstReceivedTimestamp = timestamp;
+        }
+        bufferFlags = isKeyFrame ? C.BUFFER_FLAG_KEY_FRAME : 0;
+        long timeUs = toSampleUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp);
+        trackOutput.sampleMetadata(
+            timeUs,
+            bufferFlags,
+            fragmentedSampleSizeBytes,
+            /* offset= */ 0,
+            /* encryptionData= */ null);
+        fragmentedSampleSizeBytes = 0;
+        gotFirstPacketOfVP9Frame = false;
+      }
+      previousSequenceNumber = sequenceNumber;
+    }
+  }
+
+  @Override
+  public void seek(long nextRtpTimestamp, long timeUs) {
+    firstReceivedTimestamp = nextRtpTimestamp;
+    fragmentedSampleSizeBytes = 0;
+    startTimeOffsetUs = timeUs;
+  }
+
+  // Internal methods.
+  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 boolean parseVP9Descriptor(ParsableByteArray payload, int packetSequenceNumber)
+      throws ParserException {
+    // VP9 Payload Descriptor, Section 4.2
+    //         0 1 2 3 4 5 6 7
+    //        +-+-+-+-+-+-+-+-+
+    //        |I|P|L|F|B|E|V|Z| (REQUIRED)
+    //        +-+-+-+-+-+-+-+-+
+    //   I:   |M| PICTURE ID  | (RECOMMENDED)
+    //        +-+-+-+-+-+-+-+-+
+    //   M:   | EXTENDED PID  | (RECOMMENDED)
+    //        +-+-+-+-+-+-+-+-+
+    //   L:   | TID |U| SID |D| (Conditionally RECOMMENDED)
+    //        +-+-+-+-+-+-+-+-+
+    //        |   TL0PICIDX   | (Conditionally REQUIRED)
+    //        +-+-+-+-+-+-+-+-+
+    //   V:   | SS            |
+    //        | ..            |
+    //        +-+-+-+-+-+-+-+-+
+
+    int header = payload.readUnsignedByte();
+    if (!gotFirstPacketOfVP9Frame) {
+      // For start of VP9 partition B=1 as per VP9 RFC Section 4.2.
+      if ((header & 0x08) == 0) {
+        Log.w(
+            TAG,
+            Util.formatInvariant(
+                "First payload octet of the RTP packet is not the beginning of a new VP9 partition,"
+                    + " Dropping current packet." + header));
+        return false;
+      }
+      gotFirstPacketOfVP9Frame = true;
+    } else {
+      // Check that this packet is in the sequence of the previous packet.
+      int expectedSequenceNumber = RtpPacket.getNextSequenceNumber(previousSequenceNumber);
+      if (packetSequenceNumber != expectedSequenceNumber) {
+        Log.w(
+            TAG,
+            Util.formatInvariant(
+                "Received RTP packet with unexpected sequence number. Expected: %d; received: %d."
+                    + " Dropping packet.",
+                expectedSequenceNumber, packetSequenceNumber));
+        return false;
+      }
+    }
+
+    // Check I optional header present.
+    if ((header & 0x80) != 0) {
+      int optionalHeader = payload.readUnsignedByte();
+      // Check M for 15 bits PictureID.
+      if ((optionalHeader & 0x80) != 0) {
+        if (payload.bytesLeft() < 1) {
+          return false;
+        }
+      }
+    }
+
+    // Flexible-mode not implemented.
+    checkArgument((header & 0x10) == 0, "VP9 flexible mode unsupported");
+
+    // Check L optional header present.
+    if ((header & 0x20) != 0) {
+      payload.skipBytes(1);
+      if (payload.bytesLeft() < 1) {
+        return false;
+      }
+      // Check TL0PICIDX header present (non-flexible mode).
+      if ((header & 0x10) == 0) {
+        payload.skipBytes(1);
+      }
+    }
+
+    // Check V optional header present, Refer Section 4.2.1.
+    if ((header & 0x02) != 0) {
+      int scalabilityStr = payload.readUnsignedByte();
+      int numSpatialLayers = (scalabilityStr & 0xe0) >> 5;
+      int scalabilityStrLength = ((scalabilityStr & 0x10) != 0) ? numSpatialLayers + 1 : 0;
+
+      if ((scalabilityStr & 0x10) != 0) {
+        if (payload.bytesLeft() < scalabilityStrLength * 4) {
+          return false;
+        }
+        for (int index = 0; index < scalabilityStrLength; index++) {
+          width = payload.readUnsignedShort();
+          height = payload.readUnsignedShort();
+        }
+      }
+    }
+    return true;
+  }
+}