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/*
* Copyright (C) 2017 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 com.android.voicemail.impl.transcribe;
import android.annotation.TargetApi;
import android.content.Context;
import android.net.Uri;
import android.os.Build.VERSION_CODES;
import android.support.annotation.Nullable;
import android.util.Base64;
import com.android.dialer.common.Assert;
import com.google.internal.communications.voicemailtranscription.v1.AudioFormat;
import com.google.protobuf.ByteString;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/** Utility methods used by this transcription package. */
public class TranscriptionUtils {
static final String AMR_PREFIX = "#!AMR\n";
// Uses try-with-resource
@TargetApi(android.os.Build.VERSION_CODES.N)
static ByteString getAudioData(Context context, Uri voicemailUri) {
try (InputStream in = context.getContentResolver().openInputStream(voicemailUri)) {
return ByteString.readFrom(in);
} catch (IOException e) {
return null;
}
}
static AudioFormat getAudioFormat(ByteString audioData) {
return audioData != null && audioData.startsWith(ByteString.copyFromUtf8(AMR_PREFIX))
? AudioFormat.AMR_NB_8KHZ
: AudioFormat.AUDIO_FORMAT_UNSPECIFIED;
}
@TargetApi(VERSION_CODES.O)
static String getFingerprintFor(ByteString data, @Nullable String salt) {
Assert.checkArgument(data != null);
try {
MessageDigest md = MessageDigest.getInstance("MD5");
if (salt != null) {
md.update(salt.getBytes());
}
byte[] md5Bytes = md.digest(data.toByteArray());
return Base64.encodeToString(md5Bytes, Base64.DEFAULT);
} catch (NoSuchAlgorithmException e) {
Assert.fail(e.toString());
}
return null;
}
}
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