CodecUtil.java
/*
* 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.camera.video.internal.utils;
import android.media.MediaCodec;
import android.media.MediaCodecInfo;
import android.util.LruCache;
import androidx.annotation.GuardedBy;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.video.internal.encoder.EncoderConfig;
import androidx.camera.video.internal.encoder.InvalidConfigException;
import java.io.IOException;
/** A codec utility class to deal with codec operations. */
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public final class CodecUtil {
private CodecUtil() {
// Prevent instantiation.
}
private static final int MAX_CODEC_INFO_CACHE_COUNT = 10;
// A cache from mimeType to MediaCodecInfo.
// This cache is created because MediaCodec.createEncoderByType() take relatively long time and
// findCodecAndGetCodecInfo() is being called frequently in camera-video.
@GuardedBy("sCodecInfoCache")
private static final LruCache<String, MediaCodecInfo> sCodecInfoCache = new LruCache<>(
MAX_CODEC_INFO_CACHE_COUNT);
/**
* Creates a codec instance suitable for the encoder config.
*
* @throws InvalidConfigException if it fails create the codec.
*/
@NonNull
public static MediaCodec createCodec(@NonNull EncoderConfig encoderConfig)
throws InvalidConfigException {
return createCodec(encoderConfig.getMimeType());
}
/**
* Finds and creates a codec info instance suitable for the encoder config.
*
* @throws InvalidConfigException if it fails to find or create the codec info.
*/
@NonNull
public static MediaCodecInfo findCodecAndGetCodecInfo(@NonNull EncoderConfig encoderConfig)
throws InvalidConfigException {
String mimeType = encoderConfig.getMimeType();
MediaCodecInfo codecInfo;
synchronized (sCodecInfoCache) {
codecInfo = sCodecInfoCache.get(mimeType);
}
if (codecInfo != null) {
return codecInfo;
}
MediaCodec codec = null;
try {
codec = createCodec(mimeType);
codecInfo = codec.getCodecInfo();
synchronized (sCodecInfoCache) {
sCodecInfoCache.put(mimeType, codecInfo);
}
return codecInfo;
} finally {
if (codec != null) {
codec.release();
}
}
}
@NonNull
private static MediaCodec createCodec(@NonNull String mimeType) throws InvalidConfigException {
try {
return MediaCodec.createEncoderByType(mimeType);
} catch (IOException | IllegalArgumentException e) {
throw new InvalidConfigException(e);
}
}
}