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Added MPEG4 RTP packet reader and added support for MPEG4 playback through RTSP Change-Id: I57c9a61b18471dbd2c368177ebfb89ee662f995b
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166
...es/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/reader/RtpMPEG4Reader.java
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| /* | ||
| * 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; | ||
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| import static androidx.media3.common.util.Assertions.checkStateNotNull; | ||
| import static androidx.media3.common.util.Util.castNonNull; | ||
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| 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.RtpPayloadFormat; | ||
| import androidx.media3.extractor.ExtractorOutput; | ||
| import androidx.media3.extractor.TrackOutput; | ||
| import com.google.common.primitives.Bytes; | ||
| import java.io.File; | ||
| import java.io.FileOutputStream; | ||
| import java.io.IOException; | ||
| import org.checkerframework.checker.nullness.qual.MonotonicNonNull; | ||
|
|
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| /** | ||
| * Parses an H265 byte stream carried on RTP packets, and extracts H265 Access Units. Refer to | ||
| * RFC6416 for more details. | ||
| */ | ||
| /* package */ final class RtpMPEG4Reader implements RtpPayloadReader { | ||
| private static final String TAG = "RtpMPEG4Reader"; | ||
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| private static final long MEDIA_CLOCK_FREQUENCY = 90_000; | ||
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| /** | ||
| * VOP unit type. | ||
| */ | ||
| private static final int I_VOP = 0; | ||
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| private final RtpPayloadFormat payloadFormat; | ||
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| private @MonotonicNonNull TrackOutput trackOutput; | ||
| @C.BufferFlags private int bufferFlags; | ||
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| private long firstReceivedTimestamp; | ||
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| private int previousSequenceNumber; | ||
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| private long startTimeOffsetUs; | ||
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| private int sampleLength; | ||
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| File output = null; | ||
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| FileOutputStream outputStream = null; | ||
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| /** Creates an instance. */ | ||
| public RtpMPEG4Reader(RtpPayloadFormat payloadFormat) { | ||
| this.payloadFormat = payloadFormat; | ||
| firstReceivedTimestamp = C.TIME_UNSET; | ||
| previousSequenceNumber = C.INDEX_UNSET; | ||
| sampleLength = 0; | ||
| try { | ||
| output = new File("/data/local/tmp/" + "mpeg4v_es.out"); | ||
| outputStream = new FileOutputStream(output); | ||
| } catch (IOException e) { | ||
| //do nothing; | ||
| } | ||
| } | ||
|
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| 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); | ||
| } | ||
|
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| @Override | ||
| public void createTracks(ExtractorOutput extractorOutput, int trackId) { | ||
| trackOutput = extractorOutput.track(trackId, C.TRACK_TYPE_VIDEO); | ||
| castNonNull(trackOutput).format(payloadFormat.format); | ||
| } | ||
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| @Override | ||
| public void onReceivingFirstPacket(long timestamp, int sequenceNumber) { | ||
| Log.i(TAG, "RtpMPEG4Reader onReceivingFirstPacket"); | ||
| } | ||
|
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| @Override | ||
| public void consume(ParsableByteArray data, long timestamp, int sequenceNumber, boolean rtpMarker) | ||
| throws ParserException { | ||
| if (previousSequenceNumber != C.INDEX_UNSET && sequenceNumber != (previousSequenceNumber + 1)) { | ||
| Log.e(TAG, "Packet loss"); | ||
| } | ||
| checkStateNotNull(trackOutput); | ||
|
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| int limit = data.bytesLeft(); | ||
| trackOutput.sampleData(data, limit); | ||
| sampleLength += limit; | ||
| parseVopType(data); | ||
|
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| // Write the video sample | ||
| if (outputStream != null) { | ||
| try { | ||
| outputStream.write(data.getData()); | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
|
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| // Marker (M) bit: The marker bit is set to 1 to indicate the last RTP | ||
| // packet(or only RTP packet) of a VOP. When multiple VOPs are carried | ||
| // in the same RTP packet, the marker bit is set to 1. | ||
| if (rtpMarker) { | ||
| if (firstReceivedTimestamp == C.TIME_UNSET) { | ||
| firstReceivedTimestamp = timestamp; | ||
| } | ||
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| long timeUs = toSampleUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp); | ||
| trackOutput.sampleMetadata(timeUs, bufferFlags, sampleLength, 0, null); | ||
| sampleLength = 0; | ||
| } | ||
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| previousSequenceNumber = sequenceNumber; | ||
| } | ||
|
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| /** | ||
| * Parses VOP Coding type | ||
| * | ||
| * Sets {@link #bufferFlags} according to the VOP Coding type. | ||
| */ | ||
| private void parseVopType(ParsableByteArray data) { | ||
| // search for VOP_START_CODE (00 00 01 B6) | ||
| byte[] inputData = data.getData(); | ||
| byte[] startCode = {0x0, 0x0, 0x01, (byte) 0xB6}; | ||
| int vopStartCodePos = Bytes.indexOf(inputData, startCode); | ||
| if (vopStartCodePos != -1) { | ||
| data.setPosition(vopStartCodePos + 4); | ||
| int vopType = data.peekUnsignedByte() >> 6; | ||
| bufferFlags = getBufferFlagsFromVopType(vopType); | ||
| } | ||
| } | ||
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| @C.BufferFlags | ||
| private static int getBufferFlagsFromVopType(int vopType) { | ||
| return vopType == I_VOP ? C.BUFFER_FLAG_KEY_FRAME : 0; | ||
| } | ||
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| @Override | ||
| public void seek(long nextRtpTimestamp, long timeUs) { | ||
| firstReceivedTimestamp = nextRtpTimestamp; | ||
| startTimeOffsetUs = timeUs; | ||
| sampleLength = 0; | ||
| } | ||
| } |