Define the default RTSP character set.

#minor-release

PiperOrigin-RevId: 374433331

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspMessageChannel.java

@@ -40,6 +40,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.Socket;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.List;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
@@ -47,6 +48,9 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 /** Sends and receives RTSP messages. */
 /* package */ final class RtspMessageChannel implements Closeable {
 
+  /** RTSP uses UTF-8 (RFC2326 Section 1.1). */
+  public static final Charset CHARSET = Charsets.UTF_8;
+
   private static final String TAG = "RtspMessageChannel";
 
   /** A listener for received RTSP messages and possible failures. */
@@ -383,8 +387,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
               && lineBytes[lineBytes.length - 2] == Ascii.CR
               && lineBytes[lineBytes.length - 1] == Ascii.LF);
       String line =
-          new String(
-              lineBytes, /* offset= */ 0, /* length= */ lineBytes.length - 2, Charsets.UTF_8);
+          new String(lineBytes, /* offset= */ 0, /* length= */ lineBytes.length - 2, CHARSET);
       messageLines.add(line);
 
       switch (state) {

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspMessageUtil.java

@@ -37,7 +37,6 @@ import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ParserException;
 import com.google.android.exoplayer2.util.Util;
-import com.google.common.base.Charsets;
 import com.google.common.base.Joiner;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
@@ -139,7 +138,7 @@ import java.util.regex.Pattern;
    *     removed.
    */
   public static byte[] convertMessageToByteArray(List<String> message) {
-    return Joiner.on("\r\n").join(message).getBytes(Charsets.UTF_8);
+    return Joiner.on("\r\n").join(message).getBytes(RtspMessageChannel.CHARSET);
   }
 
   /** Removes the user info from the supplied {@link Uri}. */

library/rtsp/src/test/java/com/google/android/exoplayer2/source/rtsp/RtspMessageUtilTest.java

@@ -20,7 +20,6 @@ import static com.google.common.truth.Truth.assertThat;
 
 import android.net.Uri;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
-import com.google.common.base.Charsets;
 import com.google.common.collect.ImmutableMap;
 import java.util.Arrays;
 import java.util.List;
@@ -219,7 +218,7 @@ public final class RtspMessageUtilTest {
 
     assertThat(messageLines).isEqualTo(expectedLines);
     assertThat(RtspMessageUtil.convertMessageToByteArray(messageLines))
-        .isEqualTo(expectedRtspMessage.getBytes(Charsets.UTF_8));
+        .isEqualTo(expectedRtspMessage.getBytes(RtspMessageChannel.CHARSET));
   }
 
   @Test
@@ -252,7 +251,7 @@ public final class RtspMessageUtilTest {
             + "\r\n";
     assertThat(messageLines).isEqualTo(expectedLines);
     assertThat(RtspMessageUtil.convertMessageToByteArray(messageLines))
-        .isEqualTo(expectedRtspMessage.getBytes(Charsets.UTF_8));
+        .isEqualTo(expectedRtspMessage.getBytes(RtspMessageChannel.CHARSET));
   }
 
   @Test
@@ -317,7 +316,7 @@ public final class RtspMessageUtilTest {
 
     assertThat(messageLines).isEqualTo(expectedLines);
     assertThat(RtspMessageUtil.convertMessageToByteArray(messageLines))
-        .isEqualTo(expectedRtspMessage.getBytes(Charsets.UTF_8));
+        .isEqualTo(expectedRtspMessage.getBytes(RtspMessageChannel.CHARSET));
   }
 
   @Test
@@ -334,7 +333,7 @@ public final class RtspMessageUtilTest {
 
     assertThat(RtspMessageUtil.serializeResponse(response)).isEqualTo(expectedLines);
     assertThat(RtspMessageUtil.convertMessageToByteArray(messageLines))
-        .isEqualTo(expectedRtspMessage.getBytes(Charsets.UTF_8));
+        .isEqualTo(expectedRtspMessage.getBytes(RtspMessageChannel.CHARSET));
   }
 
   @Test