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Simplify EventMessageEncoder/Decoder serialization

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We're no longer tied to the emsg spec, so we can skip unused fields
and assume ms for duration.

Also remove @Nullable annotation from EventMessageEncoder#encode, it
seems the current implementation never returns null

PiperOrigin-RevId: 262135009
This commit is contained in:
ibaker 2019-08-07 15:56:25 +01:00 committed by Oliver Woodman
parent bb6b0e1a5a
commit a08b537e8e
4 changed files with 40 additions and 67 deletions
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15
library/core/src/main/java/com/google/android/exoplayer2/metadata/emsg/EventMessageDecoder.java
View File

@ -15,22 +15,17 @@
*/
package com.google.android.exoplayer2.metadata.emsg;
import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.metadata.Metadata;
import com.google.android.exoplayer2.metadata.MetadataDecoder;
import com.google.android.exoplayer2.metadata.MetadataInputBuffer;
import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.Log;
import com.google.android.exoplayer2.util.ParsableByteArray;
import com.google.android.exoplayer2.util.Util;
import java.nio.ByteBuffer;
import java.util.Arrays;
/** Decodes data encoded by {@link EventMessageEncoder}. */
public final class EventMessageDecoder implements MetadataDecoder {
private static final String TAG = "EventMessageDecoder";
@SuppressWarnings("ByteBufferBackingArray")
@Override
public Metadata decode(MetadataInputBuffer inputBuffer) {
@ -43,15 +38,7 @@ public final class EventMessageDecoder implements MetadataDecoder {
public EventMessage decode(ParsableByteArray emsgData) {
String schemeIdUri = Assertions.checkNotNull(emsgData.readNullTerminatedString());
String value = Assertions.checkNotNull(emsgData.readNullTerminatedString());
long timescale = emsgData.readUnsignedInt();
long presentationTimeDelta = emsgData.readUnsignedInt();
if (presentationTimeDelta != 0) {
// We expect the source to have accounted for presentation_time_delta by adjusting the sample
// timestamp and zeroing the field in the sample data. Log a warning if the field is non-zero.
Log.w(TAG, "Ignoring non-zero presentation_time_delta: " + presentationTimeDelta);
}
long durationMs =
Util.scaleLargeTimestamp(emsgData.readUnsignedInt(), C.MILLIS_PER_SECOND, timescale);
long durationMs = emsgData.readUnsignedInt();
long id = emsgData.readUnsignedInt();
byte[] messageData =
Arrays.copyOfRange(emsgData.data, emsgData.getPosition(), emsgData.limit());

4
library/core/src/main/java/com/google/android/exoplayer2/metadata/emsg/EventMessageEncoder.java
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@ -15,7 +15,6 @@
*/
package com.google.android.exoplayer2.metadata.emsg;
import androidx.annotation.Nullable;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
@ -40,15 +39,12 @@ public final class EventMessageEncoder {
* @param eventMessage The event message to be encoded.
* @return The serialized byte array.
*/
@Nullable
public byte[] encode(EventMessage eventMessage) {
byteArrayOutputStream.reset();
try {
writeNullTerminatedString(dataOutputStream, eventMessage.schemeIdUri);
String nonNullValue = eventMessage.value != null ? eventMessage.value : "";
writeNullTerminatedString(dataOutputStream, nonNullValue);
writeUnsignedInt(dataOutputStream, 1000); // timescale
writeUnsignedInt(dataOutputStream, 0); // presentation_time_delta
writeUnsignedInt(dataOutputStream, eventMessage.durationMs);
writeUnsignedInt(dataOutputStream, eventMessage.id);
dataOutputStream.write(eventMessage.messageData);

19
library/core/src/test/java/com/google/android/exoplayer2/metadata/emsg/EventMessageDecoderTest.java
View File

@ -15,6 +15,8 @@
*/
package com.google.android.exoplayer2.metadata.emsg;
import static com.google.android.exoplayer2.testutil.TestUtil.createByteArray;
import static com.google.android.exoplayer2.testutil.TestUtil.joinByteArrays;
import static com.google.common.truth.Truth.assertThat;
import androidx.test.ext.junit.runners.AndroidJUnit4;
@ -30,18 +32,19 @@ public final class EventMessageDecoderTest {
@Test
public void testDecodeEventMessage() {
byte[] rawEmsgBody = new byte[] {
117, 114, 110, 58, 116, 101, 115, 116, 0, // scheme_id_uri = "urn:test"
49, 50, 51, 0, // value = "123"
0, 0, -69, -128, // timescale = 48000
0, 0, -69, -128, // presentation_time_delta = 48000
0, 2, 50, -128, // event_duration = 144000
0, 15, 67, -45, // id = 1000403
0, 1, 2, 3, 4}; // message_data = {0, 1, 2, 3, 4}
byte[] rawEmsgBody =
joinByteArrays(
createByteArray(117, 114, 110, 58, 116, 101, 115, 116, 0), // scheme_id_uri = "urn:test"
createByteArray(49, 50, 51, 0), // value = "123"
createByteArray(0, 0, 11, 184), // event_duration_ms = 3000
createByteArray(0, 15, 67, 211), // id = 1000403
createByteArray(0, 1, 2, 3, 4)); // message_data = {0, 1, 2, 3, 4}
EventMessageDecoder decoder = new EventMessageDecoder();
MetadataInputBuffer buffer = new MetadataInputBuffer();
buffer.data = ByteBuffer.allocate(rawEmsgBody.length).put(rawEmsgBody);
Metadata metadata = decoder.decode(buffer);
assertThat(metadata.length()).isEqualTo(1);
EventMessage eventMessage = (EventMessage) metadata.get(0);
assertThat(eventMessage.schemeIdUri).isEqualTo("urn:test");

69
library/core/src/test/java/com/google/android/exoplayer2/metadata/emsg/EventMessageEncoderTest.java
View File

@ -15,6 +15,8 @@
*/
package com.google.android.exoplayer2.metadata.emsg;
import static com.google.android.exoplayer2.testutil.TestUtil.createByteArray;
import static com.google.android.exoplayer2.testutil.TestUtil.joinByteArrays;
import static com.google.common.truth.Truth.assertThat;
import androidx.test.ext.junit.runners.AndroidJUnit4;
@ -29,67 +31,52 @@ import org.junit.runner.RunWith;
@RunWith(AndroidJUnit4.class)
public final class EventMessageEncoderTest {
private static final EventMessage DECODED_MESSAGE =
new EventMessage("urn:test", "123", 3000, 1000403, new byte[] {0, 1, 2, 3, 4});
private static final byte[] ENCODED_MESSAGE =
joinByteArrays(
createByteArray(117, 114, 110, 58, 116, 101, 115, 116, 0), // scheme_id_uri = "urn:test"
createByteArray(49, 50, 51, 0), // value = "123"
createByteArray(0, 0, 11, 184), // event_duration_ms = 3000
createByteArray(0, 15, 67, 211), // id = 1000403
createByteArray(0, 1, 2, 3, 4)); // message_data = {0, 1, 2, 3, 4}
@Test
public void testEncodeEventStream() throws IOException {
EventMessage eventMessage =
new EventMessage("urn:test", "123", 3000, 1000403, new byte[] {0, 1, 2, 3, 4});
byte[] expectedEmsgBody =
new byte[] {
117, 114, 110, 58, 116, 101, 115, 116, 0, // scheme_id_uri = "urn:test"
49, 50, 51, 0, // value = "123"
0, 0, 3, -24, // timescale = 1000
0, 0, 0, 0, // presentation_time_delta = 0
0, 0, 11, -72, // event_duration = 3000
0, 15, 67, -45, // id = 1000403
0, 1, 2, 3, 4
}; // message_data = {0, 1, 2, 3, 4}
byte[] encodedByteArray = new EventMessageEncoder().encode(eventMessage);
assertThat(encodedByteArray).isEqualTo(expectedEmsgBody);
byte[] foo = new byte[] {1, 2, 3};
byte[] encodedByteArray = new EventMessageEncoder().encode(DECODED_MESSAGE);
assertThat(encodedByteArray).isEqualTo(ENCODED_MESSAGE);
}
@Test
public void testEncodeDecodeEventStream() throws IOException {
EventMessage expectedEmsg =
new EventMessage("urn:test", "123", 3000, 1000403, new byte[] {0, 1, 2, 3, 4});
byte[] encodedByteArray = new EventMessageEncoder().encode(expectedEmsg);
byte[] encodedByteArray = new EventMessageEncoder().encode(DECODED_MESSAGE);
MetadataInputBuffer buffer = new MetadataInputBuffer();
buffer.data = ByteBuffer.allocate(encodedByteArray.length).put(encodedByteArray);
EventMessageDecoder decoder = new EventMessageDecoder();
Metadata metadata = decoder.decode(buffer);
assertThat(metadata.length()).isEqualTo(1);
assertThat(metadata.get(0)).isEqualTo(expectedEmsg);
assertThat(metadata.get(0)).isEqualTo(DECODED_MESSAGE);
}
@Test
public void testEncodeEventStreamMultipleTimesWorkingCorrectly() throws IOException {
EventMessage eventMessage =
new EventMessage("urn:test", "123", 3000, 1000403, new byte[] {0, 1, 2, 3, 4});
byte[] expectedEmsgBody =
new byte[] {
117, 114, 110, 58, 116, 101, 115, 116, 0, // scheme_id_uri = "urn:test"
49, 50, 51, 0, // value = "123"
0, 0, 3, -24, // timescale = 1000
0, 0, 0, 0, // presentation_time_delta = 0
0, 0, 11, -72, // event_duration = 3000
0, 15, 67, -45, // id = 1000403
0, 1, 2, 3, 4
}; // message_data = {0, 1, 2, 3, 4}
EventMessage eventMessage1 =
new EventMessage("urn:test", "123", 3000, 1000402, new byte[] {4, 3, 2, 1, 0});
byte[] expectedEmsgBody1 =
new byte[] {
117, 114, 110, 58, 116, 101, 115, 116, 0, // scheme_id_uri = "urn:test"
49, 50, 51, 0, // value = "123"
0, 0, 3, -24, // timescale = 1000
0, 0, 0, 0, // presentation_time_delta = 0
0, 0, 11, -72, // event_duration = 3000
0, 15, 67, -46, // id = 1000402
4, 3, 2, 1, 0
}; // message_data = {4, 3, 2, 1, 0}
joinByteArrays(
createByteArray(117, 114, 110, 58, 116, 101, 115, 116, 0), // scheme_id_uri = "urn:test"
createByteArray(49, 50, 51, 0), // value = "123"
createByteArray(0, 0, 11, 184), // event_duration_ms = 3000
createByteArray(0, 15, 67, 210), // id = 1000402
createByteArray(4, 3, 2, 1, 0)); // message_data = {4, 3, 2, 1, 0}
EventMessageEncoder eventMessageEncoder = new EventMessageEncoder();
byte[] encodedByteArray = eventMessageEncoder.encode(eventMessage);
assertThat(encodedByteArray).isEqualTo(expectedEmsgBody);
byte[] encodedByteArray = eventMessageEncoder.encode(DECODED_MESSAGE);
assertThat(encodedByteArray).isEqualTo(ENCODED_MESSAGE);
byte[] encodedByteArray1 = eventMessageEncoder.encode(eventMessage1);
assertThat(encodedByteArray1).isEqualTo(expectedEmsgBody1);
}