RtpReaderUtils.java
/*
* 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 androidx.media3.common.C;
import androidx.media3.common.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() {}
}