Add WebpExtractor

Also adds it to the DefaultExtractorsFactory for use throughout exoplayer

PiperOrigin-RevId: 562784760

RELEASENOTES.md

@@ -20,6 +20,7 @@
 *   Track Selection:
 *   Extractors:
     *   Add `BmpExtractor`.
+    *   Add `WebpExtractor`.
 *   Audio:
     *   Add support for Opus gapless metadata during offload playback.
 *   Video:

libraries/extractor/src/main/java/androidx/media3/extractor/webp/WebpExtractor.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2023 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.extractor.webp;
+
+import androidx.media3.common.MimeTypes;
+import androidx.media3.common.util.ParsableByteArray;
+import androidx.media3.common.util.UnstableApi;
+import androidx.media3.extractor.Extractor;
+import androidx.media3.extractor.ExtractorInput;
+import androidx.media3.extractor.ExtractorOutput;
+import androidx.media3.extractor.PositionHolder;
+import androidx.media3.extractor.SingleSampleExtractorHelper;
+import java.io.IOException;
+
+/** Extracts data from the WEBP container format. */
+@UnstableApi
+public final class WebpExtractor implements Extractor {
+
+  // Documentation Reference:
+  // https://developers.google.com/speed/webp/docs/riff_container#webp_file_header
+  private static final int FILE_SIGNATURE_SEGMENT_LENGTH = 4;
+  private static final int RIFF_FILE_SIGNATURE = 0x52494646;
+  private static final int WEBP_FILE_SIGNATURE = 0x57454250;
+
+  private final SingleSampleExtractorHelper imageExtractor;
+
+  /** Creates an instance. */
+  public WebpExtractor() {
+    imageExtractor = new SingleSampleExtractorHelper();
+  }
+
+  @Override
+  public boolean sniff(ExtractorInput input) throws IOException {
+    // The full file signature for the format webp is RIFF????WEBP.
+    ParsableByteArray scratch = new ParsableByteArray(FILE_SIGNATURE_SEGMENT_LENGTH);
+
+    input.peekFully(scratch.getData(), /* offset= */ 0, FILE_SIGNATURE_SEGMENT_LENGTH);
+    if (scratch.readUnsignedInt() != RIFF_FILE_SIGNATURE) {
+      return false;
+    }
+
+    input.advancePeekPosition(FILE_SIGNATURE_SEGMENT_LENGTH);
+    scratch.reset(/* limit= */ FILE_SIGNATURE_SEGMENT_LENGTH);
+
+    input.peekFully(scratch.getData(), /* offset= */ 0, FILE_SIGNATURE_SEGMENT_LENGTH);
+    return scratch.readUnsignedInt() == WEBP_FILE_SIGNATURE;
+  }
+
+  @Override
+  public void init(ExtractorOutput output) {
+    imageExtractor.init(output, MimeTypes.IMAGE_WEBP);
+  }
+
+  @Override
+  public @ReadResult int read(ExtractorInput input, PositionHolder seekPosition)
+      throws IOException {
+    return imageExtractor.read(input, seekPosition);
+  }
+
+  @Override
+  public void seek(long position, long timeUs) {
+    imageExtractor.seek(position);
+  }
+
+  @Override
+  public void release() {
+    // Do nothing.
+  }
+}

libraries/extractor/src/main/java/androidx/media3/extractor/webp/package-info.java

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2023 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.
+ */
+@NonNullApi
+package androidx.media3.extractor.webp;
+
+import androidx.media3.common.util.NonNullApi;

libraries/extractor/src/test/java/androidx/media3/extractor/webp/WebpExtractorTest.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2023 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.extractor.webp;
+
+import androidx.media3.test.utils.ExtractorAsserts;
+import com.google.common.collect.ImmutableList;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.ParameterizedRobolectricTestRunner;
+
+/** Unit tests for {@link WebpExtractor}. */
+@RunWith(ParameterizedRobolectricTestRunner.class)
+public final class WebpExtractorTest {
+
+  @ParameterizedRobolectricTestRunner.Parameters(name = "{0}")
+  public static ImmutableList<ExtractorAsserts.SimulationConfig> params() {
+    return ExtractorAsserts.configs();
+  }
+
+  @ParameterizedRobolectricTestRunner.Parameter
+  public ExtractorAsserts.SimulationConfig simulationConfig;
+
+  @Test
+  public void sampleWebp() throws Exception {
+    ExtractorAsserts.assertBehavior(
+        WebpExtractor::new, "media/webp/ic_launcher_round.webp", simulationConfig);
+  }
+}

libraries/test_data/src/test/assets/extractordumps/webp/ic_launcher_round.webp.0.dump

@@ -0,0 +1,16 @@
+seekMap:
+  isSeekable = true
+  duration = UNSET TIME
+  getPosition(0) = [[timeUs=0, position=0]]
+  getPosition(1) = [[timeUs=1, position=0]]
+numberOfTracks = 1
+track 1024:
+  total output bytes = 7778
+  sample count = 1
+  format 0:
+    containerMimeType = image/webp
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 7778, hash 471EBEE1
+tracksEnded = true

libraries/test_data/src/test/assets/extractordumps/webp/ic_launcher_round.webp.unknown_length.dump

@@ -0,0 +1,16 @@
+seekMap:
+  isSeekable = true
+  duration = UNSET TIME
+  getPosition(0) = [[timeUs=0, position=0]]
+  getPosition(1) = [[timeUs=1, position=0]]
+numberOfTracks = 1
+track 1024:
+  total output bytes = 7778
+  sample count = 1
+  format 0:
+    containerMimeType = image/webp
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 7778, hash 471EBEE1
+tracksEnded = true