Implement reading of media track info from WebM and MP4 containers

media/formats/webm/webm_stream_parser.cc

 // Copyright 2014 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 "media/formats/webm/webm_stream_parser.h"
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
 #include "media/base/media_track.h"
 #include "media/base/media_tracks.h"
 #include "media/base/timestamp_constants.h"
 #include "media/formats/webm/webm_cluster_parser.h"
 #include "media/formats/webm/webm_constants.h"
 #include "media/formats/webm/webm_content_encodings.h"
 #include "media/formats/webm/webm_info_parser.h"
 #include "media/formats/webm/webm_tracks_parser.h"
 
 namespace media {
@@ skipping 195 matching lines @@
   }
 
   const AudioDecoderConfig& audio_config = tracks_parser.audio_decoder_config();
   if (audio_config.is_encrypted())
     OnEncryptedMediaInitData(tracks_parser.audio_encryption_key_id());
 
   const VideoDecoderConfig& video_config = tracks_parser.video_decoder_config();
   if (video_config.is_encrypted())
     OnEncryptedMediaInitData(tracks_parser.video_encryption_key_id());
 
-  scoped_ptr<MediaTracks> media_tracks(new MediaTracks());
-  // TODO(servolk): Implement proper sourcing of media track info as described
-  // in crbug.com/590085
-  if (audio_config.IsValidConfig()) {
-    media_tracks->AddAudioTrack(audio_config, "audio", "", "", "");
-  }
-  if (video_config.IsValidConfig()) {
-    media_tracks->AddVideoTrack(video_config, "video", "", "", "");
-  }
+  scoped_ptr<MediaTracks> media_tracks = tracks_parser.media_tracks();
+  CHECK(media_tracks.get());
   if (!config_cb_.Run(std::move(media_tracks), tracks_parser.text_tracks())) {
     DVLOG(1) << "New config data isn't allowed.";
     return -1;
   }
 
   cluster_parser_.reset(new WebMClusterParser(
       info_parser.timecode_scale(), tracks_parser.audio_track_num(),
       tracks_parser.GetAudioDefaultDuration(timecode_scale_in_us),
       tracks_parser.video_track_num(),
       tracks_parser.GetVideoDefaultDuration(timecode_scale_in_us),
@@ skipping 35 matching lines @@
 
   return bytes_parsed;
 }
 
 void WebMStreamParser::OnEncryptedMediaInitData(const std::string& key_id) {
   std::vector<uint8_t> key_id_vector(key_id.begin(), key_id.end());
   encrypted_media_init_data_cb_.Run(EmeInitDataType::WEBM, key_id_vector);
 }
 
 }  // namespace media