Basic media tracks implementation for media stream parsers

media/formats/mpeg/mpeg_audio_stream_parser_base.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/mpeg/mpeg_audio_stream_parser_base.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/message_loop/message_loop.h"
+#include "media/base/media_tracks.h"
 #include "media/base/stream_parser_buffer.h"
 #include "media/base/text_track_config.h"
 #include "media/base/timestamp_constants.h"
 #include "media/base/video_decoder_config.h"
 
 namespace media {
 
 static const uint32_t kICYStartCode = 0x49435920;  // 'ICY '
 
 // Arbitrary upper bound on the size of an IceCast header before it
@@ skipping 193 matching lines @@
                        base::TimeDelta(),
                        codec_delay_);
 
     base::TimeDelta base_timestamp;
     if (timestamp_helper_)
       base_timestamp = timestamp_helper_->GetTimestamp();
 
     timestamp_helper_.reset(new AudioTimestampHelper(sample_rate));
     timestamp_helper_->SetBaseTimestamp(base_timestamp);
 
-    VideoDecoderConfig video_config;
-    if (!config_cb_.Run(config_, video_config, TextTrackConfigMap()))
+    scoped_ptr<MediaTracks> media_tracks(new MediaTracks());
+    if (config_.IsValidConfig()) {
+      media_tracks->AddAudioTrack(config_, "audio", "", "", "");

[wolenetz, 2016/02/26 19:29:28]

aside: the corresponding MSE bytestream spec allows for implementations to
choose if and how to expose IDv1/3/icecast headers (and suggests as text
tracks). Hence, I don't think we need to prioritize sourcing inband audio track
attributes yet in this particular stream parser at the moment.

[servolk, 2016/02/26 22:02:41]

Acknowledged.

+    }
+    if (!config_cb_.Run(std::move(media_tracks), TextTrackConfigMap()))
       return -1;
 
     if (!init_cb_.is_null()) {
       InitParameters params(kInfiniteDuration());
       params.auto_update_timestamp_offset = true;
       base::ResetAndReturn(&init_cb_).Run(params);
     }
   }
 
   if (metadata_frame)
@@ skipping 177 matching lines @@
   if (end_of_segment) {
     in_media_segment_ = false;
     end_of_segment_cb_.Run();
   }
 
   timestamp_helper_->SetBaseTimestamp(base::TimeDelta());
   return true;
 }
 
 }  // namespace media