Media Galleries API Metadata: Add audio video metadata extractor.

chrome/utility/media_galleries/media_metadata_parser.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/utility/media_galleries/media_metadata_parser.h"
 
+#include <string>
+
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
+#include "base/strings/string_util.h"
+#include "media/base/audio_video_metadata_extractor.h"
+#include "media/base/data_source.h"
 
 namespace metadata {
 
-MediaMetadataParser::MediaMetadataParser(DataReader* reader,
+namespace {
+
+void SetStringScopedPtr(const std::string& value,
+                        scoped_ptr<std::string>* destination) {
+  if (!value.empty())
+    destination->reset(new std::string(value));
+}
+
+void SetIntScopedPtr(int value, scoped_ptr<int>* destination) {
+  if (value >= 0)
+    destination->reset(new int(value));
+}
+
+}  // namespace
+
+MediaMetadataParser::MediaMetadataParser(media::DataSource* source,
                                          const std::string& mime_type)
-    : reader_(reader),
+    : source_(source),
       metadata_(new MediaMetadata) {
   metadata_->mime_type = mime_type;
 }
 
 MediaMetadataParser::~MediaMetadataParser() {}
 
 void MediaMetadataParser::Start(const MetadataCallback& callback) {
   DCHECK(callback_.is_null());
   callback_ = callback;
 
-  // TODO(tommycli): Implement for various mime types.
+  if (StartsWithASCII(metadata_->mime_type, "audio/", true) ||
+      StartsWithASCII(metadata_->mime_type, "video/", true)) {
+    PopulateAudioVideoMetadata();
+  }
+
+  // TODO(tommycli): Implement for image mime types.
   callback_.Run(metadata_.Pass());
 }
 
+void MediaMetadataParser::PopulateAudioVideoMetadata() {
+  DCHECK(source_);
+  DCHECK(metadata_.get());
+  media::AudioVideoMetadataExtractor extractor;
+
+  if (!extractor.Extract(source_))
+    return;
+
+  if (extractor.duration() >= 0)
+    metadata_->duration.reset(new double(extractor.duration()));
+
+  if (extractor.height() >= 0 && extractor.width() >= 0) {
+    metadata_->height.reset(new int(extractor.height()));
+    metadata_->width.reset(new int(extractor.width()));
+  }
+
+  SetStringScopedPtr(extractor.artist(), &metadata_->artist);
+  SetStringScopedPtr(extractor.album(), &metadata_->album);
+  SetStringScopedPtr(extractor.artist(), &metadata_->artist);
+  SetStringScopedPtr(extractor.comment(), &metadata_->comment);
+  SetStringScopedPtr(extractor.copyright(), &metadata_->copyright);
+  SetIntScopedPtr(extractor.disc(), &metadata_->disc);
+  SetStringScopedPtr(extractor.genre(), &metadata_->genre);
+  SetStringScopedPtr(extractor.language(), &metadata_->language);
+  SetStringScopedPtr(extractor.title(), &metadata_->title);
+  SetIntScopedPtr(extractor.track(), &metadata_->track);
+}
+
 }  // namespace metadata