MSE: Record counts of detected MSE audio, video and text tracks

media/formats/mp2t/mp2t_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/mp2t/mp2t_stream_parser.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 526 matching lines @@
     return true;
 
   // Pass the config before invoking the initialization callback.
   scoped_ptr<MediaTracks> media_tracks = GenerateMediaTrackInfo(
       queue_with_config.audio_config, queue_with_config.video_config);
   RCHECK(config_cb_.Run(std::move(media_tracks), TextTrackConfigMap()));
   queue_with_config.is_config_sent = true;
 
   // For Mpeg2 TS, the duration is not known.
   DVLOG(1) << "Mpeg2TS stream parser initialization done";
-  base::ResetAndReturn(&init_cb_).Run(InitParameters(kInfiniteDuration()));
+
+  // TODO(wolenetz): If possible, detect and report track counts by type more
+  // accurately here. Currently, capped at max 1 each for audio and video, with
+  // assumption of 0 text tracks.
+  InitParameters params(kInfiniteDuration());
+  params.detected_audio_track_count =
+      queue_with_config.audio_config.IsValidConfig() ? 1 : 0;
+  params.detected_video_track_count =
+      queue_with_config.video_config.IsValidConfig() ? 1 : 0;
+  base::ResetAndReturn(&init_cb_).Run(params);
   is_initialized_ = true;
 
   return true;
 }
 
 void Mp2tStreamParser::OnEmitAudioBuffer(
     int pes_pid,
     scoped_refptr<StreamParserBuffer> stream_parser_buffer) {
   DCHECK_EQ(pes_pid, selected_audio_pid_);
 
@@ skipping 103 matching lines @@
   // so that buffers with the same config can be added later on.
   BufferQueueWithConfig queue_with_config(
       true, last_audio_config, last_video_config);
   buffer_queue_chain_.push_back(queue_with_config);
 
   return true;
 }
 
 }  // namespace mp2t
 }  // namespace media