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https://issues.apache.org/jira/browse/NIFI-615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15342960#comment-15342960
]
ASF GitHub Bot commented on NIFI-615:
-------------------------------------
Github user joewitt commented on a diff in the pull request:
https://github.com/apache/nifi/pull/556#discussion_r67966608
--- Diff:
nifi-nar-bundles/nifi-media-bundle/nifi-media-processors/src/main/java/org/apache/nifi/processors/media/ExtractMediaMetadata.java
---
@@ -0,0 +1,311 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.nifi.processors.media;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.regex.Pattern;
+
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.SupportsBatching;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.components.Validator;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.logging.ProcessorLog;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessorInitializationContext;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.io.InputStreamCallback;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.util.ObjectHolder;
+
+import org.apache.tika.exception.TikaException;
+import org.apache.tika.io.TikaInputStream;
+import org.apache.tika.metadata.Metadata;
+import org.apache.tika.parser.AutoDetectParser;
+import org.apache.tika.sax.BodyContentHandler;
+import org.xml.sax.SAXException;
+
+@InputRequirement(Requirement.INPUT_REQUIRED)
+@Tags({"media", "file", "format", "metadata", "audio", "video", "image",
"document", "pdf"})
+@CapabilityDescription("Extract the content metadata from flowfiles
containing audio, video, image, and other file "
+ + "types. This processor relies on the Apache Tika project for
file format detection and parsing. It "
+ + "extracts a long list of metadata types for media files
including audio, video, and print media "
+ + "formats."
+ + "For the more details and the list of supported file types,
visit the library's website "
+ + "at http://tika.apache.org/.";)
+@WritesAttributes({@WritesAttribute(attribute = "<Metadata Key
Prefix>.<attribute>", description = "The extracted content metadata "
+ + "will be inserted with the attribute name \"<Metadata Key
Prefix>.<attribute>\", or \"<attribute>\" if "
+ + "\"Metadata Key Prefix\" is not provided.")})
+@SupportsBatching
+public class ExtractMediaMetadata extends AbstractProcessor {
+
+ static final PropertyDescriptor MAX_NUMBER_OF_ATTRIBUTES = new
PropertyDescriptor.Builder()
+ .name("Max Number of Attributes")
+ .description("Specify the max number of attributes to add to
the flowfile. There is no guarantee in what order"
+ + " the tags will be processed. By default it will
process all of them.")
+ .required(false)
+
.addValidator(StandardValidators.NON_NEGATIVE_INTEGER_VALIDATOR)
+ .build();
+
+ private static final PropertyDescriptor MAX_ATTRIBUTE_LENGTH = new
PropertyDescriptor.Builder()
+ .name("Max Attribute Length")
+ .description("Specifies the maximum length of a single
attribute value. When a metadata item has multiple"
+ + " values, they will be merged until this length is
reached and then \", ...\" will be added as"
+ + " an indicator that additional values where dropped.
If a single value is longer than this, it"
+ + " will be truncated and \"(truncated)\" appended to
indicate that truncation occurred.")
+ .required(true)
+ .defaultValue("10240")
--- End diff --
I would definitely encourage the use of a default value for max number of
attributes. Probably no more than 50. I'd recommend not allowing, by default,
attribute length to exceed 50 characters as well. Keep in mind flow file
attributes are held in memory for all flowfiles in the active queue and are
java Strings. They can use quite a bit of heap space so best to keep these
pretty strict.
> Create a processor to extract WAV file characteristics
> ------------------------------------------------------
>
> Key: NIFI-615
> URL: https://issues.apache.org/jira/browse/NIFI-615
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Brandon DeVries
> Assignee: Joe Skora
> Priority: Minor
> Fix For: 1.0.0, 0.7.0
>
>
> Create a processor to extract information from a WAV file, including
> encoding, bit rate, metadata, etc...
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