chrome/utility/media_galleries/media_metadata_parser.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/utility/media_galleries/media_metadata_parser.h"
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "base/strings/string_util.h"
  12 #include "media/base/audio_video_metadata_extractor.h"
  13 #include "media/base/data_source.h"
  14
  15 namespace metadata {
  16
  17 namespace {
  18
  19 void SetStringScopedPtr(const std::string& value,
  20                         scoped_ptr<std::string>* destination) {
  21   if (!value.empty())
  22     destination->reset(new std::string(value));
  23 }
  24
  25 void SetIntScopedPtr(int value, scoped_ptr<int>* destination) {
  26   if (value >= 0)
  27     destination->reset(new int(value));
  28 }
  29
  30 }  // namespace
  31
  32 MediaMetadataParser::MediaMetadataParser(media::DataSource* source,
  33                                          const std::string& mime_type)
  34     : source_(source),
  35       metadata_(new MediaMetadata) {
  36   metadata_->mime_type = mime_type;
  37 }
  38
  39 MediaMetadataParser::~MediaMetadataParser() {}
  40
  41 void MediaMetadataParser::Start(const MetadataCallback& callback) {
  42   DCHECK(callback_.is_null());
  43   callback_ = callback;
  44
  45   if (StartsWithASCII(metadata_->mime_type, "audio/", true) ||
  46       StartsWithASCII(metadata_->mime_type, "video/", true)) {
  47     PopulateAudioVideoMetadata();
  48   }
  49
  50   // TODO(tommycli): Implement for image mime types.
  51   callback_.Run(metadata_.Pass());
  52 }
  53
  54 void MediaMetadataParser::PopulateAudioVideoMetadata() {
  55   DCHECK(source_);
  56   DCHECK(metadata_.get());
  57   media::AudioVideoMetadataExtractor extractor;
  58
  59   if (!extractor.Extract(source_))
  60     return;
  61
  62   if (extractor.duration() >= 0)
  63     metadata_->duration.reset(new double(extractor.duration()));
  64
  65   if (extractor.height() >= 0 && extractor.width() >= 0) {
  66     metadata_->height.reset(new int(extractor.height()));
  67     metadata_->width.reset(new int(extractor.width()));
  68   }
  69
  70   SetStringScopedPtr(extractor.artist(), &metadata_->artist);
  71   SetStringScopedPtr(extractor.album(), &metadata_->album);
  72   SetStringScopedPtr(extractor.artist(), &metadata_->artist);
  73   SetStringScopedPtr(extractor.comment(), &metadata_->comment);
  74   SetStringScopedPtr(extractor.copyright(), &metadata_->copyright);
  75   SetIntScopedPtr(extractor.disc(), &metadata_->disc);
  76   SetStringScopedPtr(extractor.genre(), &metadata_->genre);
  77   SetStringScopedPtr(extractor.language(), &metadata_->language);
  78   SetStringScopedPtr(extractor.title(), &metadata_->title);
  79   SetIntScopedPtr(extractor.track(), &metadata_->track);
  80 }
  81
  82 }  // namespace metadata