Change who allocated the MediaPipe's shared buffer.

mojo/services/media/audio/interfaces/audio_track.mojom

 // Copyright 2015 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.
 
 [DartPackage="mojo_services"]
 module mojo.media;
 
 import "mojo/services/media/common/interfaces/media_common.mojom";
 import "mojo/services/media/common/interfaces/media_pipe.mojom";
 import "mojo/services/media/common/interfaces/media_types.mojom";
 import "mojo/services/media/common/interfaces/rate_control.mojom";
 
 struct AudioTrackDescriptor {
   // The track supports the union of all these media type sets.
   array<MediaTypeSet> supported_media_types;
 };
 
 struct AudioTrackConfiguration {
   // The media type to use.
   MediaType media_type;
 
-  // Desired maximum buffer size, in frames of audio.
-  uint64 max_frames;
-
   // Ratio of audio frames to media time ticks.
   //
   // Presentation time stamps on audio packets are expressed in units of media
   // time ticks.  Many users will choose to use units of audio frames to express
   // their media time, and can simply leave this ratio at the default of 1:1.
   // For some, however, it may be more convenient to use different units for
   // media time.  For example, if the audio frame rate was 48KHz, and the time
   // stamps are expressed in 90KHz units (the units used by MPEG-2 Program
   // Stream timestamps), the ratio should be set to 48000:90000 (aka, 8:15).
   // IOW - audio_frame_ratio would be set to 8 and media_time_ratio would be set
@@ skipping 20 matching lines @@
 
   // Request the rate control interface for this AudioTrack
   GetRateControl(RateControl& rate_control);
 
   // Sets the current gain/attenuation of the track, expressed in dB.  Legal
   // values are in the range [-inf, 20.0].  Any value less than or equal to the
   // constant kMutedGain will result in the track becoming explicitly muted
   // (regardless of its underlying resolution or intensity).
   SetGain(float db_gain);
 };