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https://issues.apache.org/jira/browse/NIFI-615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15344375#comment-15344375
]
ASF GitHub Bot commented on NIFI-615:
-------------------------------------
Github user bbende commented on a diff in the pull request:
https://github.com/apache/nifi/pull/556#discussion_r68061144
--- 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")
+
.addValidator(StandardValidators.NON_NEGATIVE_INTEGER_VALIDATOR)
+ .build();
+
+ static final PropertyDescriptor MIME_TYPE_FILTER = new
PropertyDescriptor.Builder()
+ .name("MIME Type Filter")
+ .description("A regular expression identifying MIME types for
which metadata should extracted. Flowfiles"
+ + " selected for scanning by the File Name Filter are
parsed to determine the MIME type and extract"
+ + " metadata. If the MIME type found matches this
regular expression or this expression is"
+ + " blank, the metadata keys that match the Metadata
Key Filter will be added to the flowfile"
+ + " attributes. There is no guarantee in what order
attributes will be produced. If"
+ + " left blank, metadata will be extracted from all
flow files selected for scanning.")
+ .required(false)
+ .addValidator(StandardValidators.REGULAR_EXPRESSION_VALIDATOR)
+ .build();
+
+ static final PropertyDescriptor METADATA_KEY_FILTER = new
PropertyDescriptor.Builder()
+ .name("Metadata Key Filter")
+ .description("A regular expression identifying which metadata
keys received from the parser should be"
+ + " added to the flowfile attributes. If left blank,
all metadata keys parsed will be added to the"
+ + " flowfile attributes.")
+ .required(false)
+ .addValidator(StandardValidators.REGULAR_EXPRESSION_VALIDATOR)
+ .build();
+
+ static final PropertyDescriptor METADATA_KEY_PREFIX = new
PropertyDescriptor.Builder()
+ .name("Metadata Key Prefix")
+ .description("Text to be prefixed to metadata keys as the are
added to the flowfile attributes. It is"
+ + " recommended to end with with a separator character
like '.' or '-', this is not automatically "
+ + " added by the processor.")
+ .required(false)
+ .addValidator(StandardValidators.ATTRIBUTE_KEY_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ static final PropertyDescriptor CONTENT_BUFFER_SIZE = new
PropertyDescriptor.Builder()
+ .name("Content Buffer Size")
+ .description("The size for media content buffer during
processing, or -1 for unlimited. If not"
+ + " provided, the underlying parser default is used.")
+ .required(false)
+ .addValidator(StandardValidators.INTEGER_VALIDATOR)
+ .addValidator(new Validator() {
+ @Override
+ public ValidationResult validate(String subject, String
input, ValidationContext context) {
+ Integer val = null;
+ try {
+ val = Integer.parseInt(input);
+ } catch (NumberFormatException ignore) {
+ }
+ return new ValidationResult.Builder()
+ .subject(subject)
+ .input(input)
+ .valid(val != null && val >= -1)
+ .explanation(subject + " must be a valid
integer equal to or greater than -1.")
+ .build();
+ }
+ })
+ .expressionLanguageSupported(true)
+ .build();
+
+ static final Relationship SUCCESS = new Relationship.Builder()
+ .name("success")
+ .description("Any FlowFile that successfully has media
metadata extracted will be routed to success")
+ .build();
+
+ static final Relationship FAILURE = new Relationship.Builder()
+ .name("failure")
+ .description("Any FlowFile that fails to have media metadata
extracted will be routed to failure")
+ .build();
+
+ private Set<Relationship> relationships;
+ private List<PropertyDescriptor> properties;
+
+ private final AtomicReference<Pattern> mimeTypeFilterRef = new
AtomicReference<>();
+ private final AtomicReference<Pattern> metadataKeyFilterRef = new
AtomicReference<>();
+
+ private volatile AutoDetectParser autoDetectParser;
+
+ @Override
+ protected void init(final ProcessorInitializationContext context) {
+
+ final List<PropertyDescriptor> properties = new ArrayList<>();
+ properties.add(MAX_NUMBER_OF_ATTRIBUTES);
+ properties.add(MAX_ATTRIBUTE_LENGTH);
+ properties.add(MIME_TYPE_FILTER);
+ properties.add(METADATA_KEY_FILTER);
+ properties.add(METADATA_KEY_PREFIX);
+ properties.add(CONTENT_BUFFER_SIZE);
+ this.properties = Collections.unmodifiableList(properties);
+
+ final Set<Relationship> relationships = new HashSet<>();
+ relationships.add(SUCCESS);
+ relationships.add(FAILURE);
+ this.relationships = Collections.unmodifiableSet(relationships);
+ }
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ return this.relationships;
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return this.properties;
+ }
+
+ @SuppressWarnings("unused")
+ @OnScheduled
+ public void onScheduled(ProcessContext context) {
+ final String mimeTypeFilterInput =
context.getProperty(MIME_TYPE_FILTER).getValue();
+ if (mimeTypeFilterInput != null && mimeTypeFilterInput.length() >
0) {
+ mimeTypeFilterRef.set(Pattern.compile(mimeTypeFilterInput));
+ } else {
+ mimeTypeFilterRef.set(null);
+ }
+
+ String metadataKeyFilterInput =
context.getProperty(METADATA_KEY_FILTER).getValue();
+ if (metadataKeyFilterInput != null &&
metadataKeyFilterInput.length() > 0) {
+
metadataKeyFilterRef.set(Pattern.compile(metadataKeyFilterInput));
+ } else {
+ metadataKeyFilterRef.set(null);
+ }
+
+ autoDetectParser = new AutoDetectParser();
+ }
+
+ @Override
+ public void onTrigger(final ProcessContext context, final
ProcessSession session) throws ProcessException {
+ FlowFile flowFile = session.get();
+ if (flowFile == null) {
+ return;
+ }
+
+ final ProcessorLog logger = this.getLogger();
+ final ObjectHolder<Map<String, String>> value = new
ObjectHolder<>(null);
+ final Integer maxAttribCount =
context.getProperty(MAX_NUMBER_OF_ATTRIBUTES).asInteger();
+ final Integer maxAttribLength =
context.getProperty(MAX_ATTRIBUTE_LENGTH).asInteger();
+ final Integer contentBufferSize =
context.getProperty(CONTENT_BUFFER_SIZE).evaluateAttributeExpressions().asInteger();
+ final String prefix =
context.getProperty(METADATA_KEY_PREFIX).evaluateAttributeExpressions().getValue();
+
+ try {
+ session.read(flowFile, new InputStreamCallback() {
+ @Override
+ public void process(InputStream in) throws IOException {
+ try {
+ Map<String, String> results = tika_parse(in,
prefix, maxAttribCount, maxAttribLength, contentBufferSize);
+ value.set(results);
+ } catch (SAXException | TikaException e) {
+ throw new IOException(e);
+ }
+ }
+ });
+
+ // Write the results to attributes
+ Map<String, String> results = value.get();
+ if (results != null && !results.isEmpty()) {
+ flowFile = session.putAllAttributes(flowFile, results);
+ }
+
+ session.transfer(flowFile, SUCCESS);
+ session.getProvenanceReporter().modifyAttributes(flowFile,
"media attributes extracted");
+ } catch (ProcessException e) {
+ logger.error("Failed to extract media metadata from {} due to
{}", new Object[]{flowFile, e});
+ flowFile = session.penalize(flowFile);
+ session.transfer(flowFile, FAILURE);
+ }
+ }
+
+ private Map<String, String> tika_parse(InputStream sourceStream,
String prefix, Integer maxAttribs, Integer maxAttribLen,
+ Integer contentBufSize) throws
IOException, TikaException, SAXException {
+ final Metadata metadata = new Metadata();
+ final TikaInputStream tikaInputStream =
TikaInputStream.get(sourceStream);
+
+ // as of June, 2016 the default BodyContentHandler used a 100,000
byte buffer
+ final BodyContentHandler bodyContentHandler = (contentBufSize !=
null) ? new BodyContentHandler(contentBufSize) : new BodyContentHandler();
--- End diff --
I'm actually wondering if we even want to use the BodyContentHandler
here... the BodyContentHandler is used to get access to all of the extracted
content, for example if we wanted to produce another flow file, or replace the
current one with the extracted content, but it looks we aren't doing that here.
There is a DefaultHandler with all no-ops that probably makes more sense for
this scenario.
> 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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