UdpDataSourceRtpDataChannel.java
/*
* Copyright 2021 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;
import static androidx.media3.common.util.Assertions.checkArgument;
import static androidx.media3.common.util.Assertions.checkState;
import android.net.Uri;
import androidx.annotation.Nullable;
import androidx.media3.common.C;
import androidx.media3.common.PlaybackException;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.common.util.Util;
import androidx.media3.datasource.DataSpec;
import androidx.media3.datasource.TransferListener;
import androidx.media3.datasource.UdpDataSource;
import com.google.common.primitives.Ints;
import java.io.IOException;
/** An {@link RtpDataChannel} for UDP transport. */
@UnstableApi
/* package */ final class UdpDataSourceRtpDataChannel implements RtpDataChannel {
private static final String DEFAULT_UDP_TRANSPORT_FORMAT = "RTP/AVP;unicast;client_port=%d-%d";
private final UdpDataSource dataSource;
/** The associated RTCP channel; {@code null} if the current channel is an RTCP channel. */
@Nullable private UdpDataSourceRtpDataChannel rtcpChannel;
/**
* Creates a new instance.
*
* @param socketTimeoutMs The timeout for {@link #read} in milliseconds.
*/
public UdpDataSourceRtpDataChannel(long socketTimeoutMs) {
dataSource =
new UdpDataSource(UdpDataSource.DEFAULT_MAX_PACKET_SIZE, Ints.checkedCast(socketTimeoutMs));
}
@Override
public String getTransport() {
int dataPortNumber = getLocalPort();
checkState(dataPortNumber != C.INDEX_UNSET); // Assert open() is called.
return Util.formatInvariant(DEFAULT_UDP_TRANSPORT_FORMAT, dataPortNumber, dataPortNumber + 1);
}
@Override
public int getLocalPort() {
int port = dataSource.getLocalPort();
return port == UdpDataSource.UDP_PORT_UNSET ? C.INDEX_UNSET : port;
}
@Nullable
@Override
public RtspMessageChannel.InterleavedBinaryDataListener getInterleavedBinaryDataListener() {
return null;
}
@Override
public void addTransferListener(TransferListener transferListener) {
dataSource.addTransferListener(transferListener);
}
@Override
public long open(DataSpec dataSpec) throws IOException {
return dataSource.open(dataSpec);
}
@Nullable
@Override
public Uri getUri() {
return dataSource.getUri();
}
@Override
public void close() {
dataSource.close();
if (rtcpChannel != null) {
rtcpChannel.close();
}
}
@Override
public int read(byte[] buffer, int offset, int length) throws IOException {
try {
return dataSource.read(buffer, offset, length);
} catch (UdpDataSource.UdpDataSourceException e) {
if (e.reason == PlaybackException.ERROR_CODE_IO_NETWORK_CONNECTION_TIMEOUT) {
return C.RESULT_END_OF_INPUT;
} else {
throw e;
}
}
}
public void setRtcpChannel(UdpDataSourceRtpDataChannel rtcpChannel) {
checkArgument(this != rtcpChannel);
this.rtcpChannel = rtcpChannel;
}
}