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Merge pull request #56 from ittiam-systems:rtp_wav
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106 changes: 106 additions & 0 deletions
106
...ries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/reader/RtpPcmReader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /* | ||
| * 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.checkNotNull; | ||
|
|
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| import android.util.Log; | ||
| import androidx.media3.common.C; | ||
| import androidx.media3.common.util.ParsableByteArray; | ||
| import androidx.media3.common.util.UnstableApi; | ||
| 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 byte stream carried on RTP packets, and extracts PCM frames. Refer to RFC3551 for more | ||
| * details. | ||
| */ | ||
| @UnstableApi | ||
| /* package */ public final class RtpPcmReader implements RtpPayloadReader { | ||
|
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| private static final String TAG = "RtpPcmReader"; | ||
| private final RtpPayloadFormat payloadFormat; | ||
|
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| private @MonotonicNonNull TrackOutput trackOutput; | ||
| private long firstReceivedTimestamp; | ||
| private long startTimeOffsetUs; | ||
| private int previousSequenceNumber; | ||
|
|
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| public RtpPcmReader(RtpPayloadFormat payloadFormat) { | ||
| this.payloadFormat = payloadFormat; | ||
| firstReceivedTimestamp = C.TIME_UNSET; | ||
| // Start time offset must be 0 before the first seek. | ||
| startTimeOffsetUs = 0; | ||
| previousSequenceNumber = C.INDEX_UNSET; | ||
| } | ||
|
|
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| @Override | ||
| public void createTracks(ExtractorOutput extractorOutput, int trackId) { | ||
| trackOutput = extractorOutput.track(trackId, C.TRACK_TYPE_AUDIO); | ||
| trackOutput.format(payloadFormat.format); | ||
| } | ||
|
|
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| @Override | ||
| public void onReceivingFirstPacket(long timestamp, int sequenceNumber) { | ||
| firstReceivedTimestamp = timestamp; | ||
| } | ||
|
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| @Override | ||
| public void consume( | ||
| ParsableByteArray data, long timestamp, int sequenceNumber, boolean rtpMarker) { | ||
| checkNotNull(trackOutput); | ||
| if (previousSequenceNumber != C.INDEX_UNSET) { | ||
| int expectedSequenceNumber = RtpPacket.getNextSequenceNumber(previousSequenceNumber); | ||
| if (sequenceNumber != expectedSequenceNumber) { | ||
| Log.w( | ||
| TAG, | ||
| Util.formatInvariant( | ||
| "Received RTP packet with unexpected sequence number. Expected: %d; received: %d.", | ||
| expectedSequenceNumber, sequenceNumber)); | ||
| } | ||
| } | ||
|
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| long sampleTimeUs = | ||
| toSampleUs(startTimeOffsetUs, timestamp, firstReceivedTimestamp, payloadFormat.clockRate); | ||
| int size = data.bytesLeft(); | ||
| trackOutput.sampleData(data, size); | ||
| trackOutput.sampleMetadata( | ||
| sampleTimeUs, C.BUFFER_FLAG_KEY_FRAME, size, /* offset= */ 0, /* cryptoData= */ null); | ||
|
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| previousSequenceNumber = sequenceNumber; | ||
| } | ||
|
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| @Override | ||
| public void seek(long nextRtpTimestamp, long timeUs) { | ||
| // TODO(b/198620566) Rename firstReceivedTimestamp to timestampBase for all RtpPayloadReaders. | ||
| firstReceivedTimestamp = nextRtpTimestamp; | ||
| startTimeOffsetUs = timeUs; | ||
| } | ||
|
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||
| /** 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); | ||
| } | ||
| } |
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