Change who allocated the MediaPipe's shared buffer.

examples/audio_play_test/play_wav.cc

 // 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.
 
 #include <memory>
 
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/application_runner.h"
@@ skipping 249 matching lines @@
 
   LinearTransform::Ratio audio_rate(wav_info_.frame_rate, 1);
   LinearTransform::Ratio local_rate(LocalDuration::period::num,
                                     LocalDuration::period::den);
   LinearTransform::Ratio tmp;
   bool success = LinearTransform::Ratio::Compose(audio_rate, local_rate, &tmp);
   MOJO_DCHECK(success);
 
   AudioTrackConfigurationPtr cfg;
   cfg = AudioTrackConfiguration::New();
-  cfg->max_frames = USecToFrames(BUF_DEPTH_USEC);
   cfg->audio_frame_ratio = tmp.numerator;
   cfg->media_time_ratio  = tmp.denominator;
 
   LpcmMediaTypeDetailsPtr pcm_cfg = LpcmMediaTypeDetails::New();
   pcm_cfg->sample_format = (wav_info_.bits_per_sample == 8)
                          ? LpcmSampleFormat::UNSIGNED_8
                          : LpcmSampleFormat::SIGNED_16;
   pcm_cfg->channels = wav_info_.channel_count;
   pcm_cfg->frames_per_second = wav_info_.frame_rate;
 
   cfg->media_type = MediaType::New();
   cfg->media_type->scheme = MediaTypeScheme::LPCM;
   cfg->media_type->details = MediaTypeDetails::New();
   cfg->media_type->details->set_lpcm(pcm_cfg.Pass());
 
   // Configure the track based on the WAV header information.
   MediaPipePtr media_pipe;
   audio_track_->Configure(cfg.Pass(), GetProxy(&media_pipe));
 
   // Grab the rate control interface for our audio renderer.
   audio_track_->GetRateControl(GetProxy(&rate_control_));
   rate_control_.set_connection_error_handler([this]() {
     OnConnectionError("rate_control");
   });
 
   // Set up our media pipe helper, configure its callback and water marks to
   // kick off the playback process.
   audio_pipe_.reset(new CircularBufferMediaPipeAdapter(media_pipe.Pass()));
+  audio_pipe_->Init(USecToBytes(BUF_DEPTH_USEC));
   audio_pipe_->SetWatermarks(USecToBytes(BUF_HI_WATER_USEC),
                              USecToBytes(BUF_LO_WATER_USEC));
   audio_pipe_->SetSignalCallback(
   [this](MediaResult res) -> void {
     OnNeedsData(res);
   });
 }
 
 bool PlayWAVApp::ReadAndValidateRIFFHeader() {
   // Read and sanity check the top level RIFF header
@@ skipping 240 matching lines @@
 }  // namespace audio
 }  // namespace media
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle app_request) {
   mojo::ApplicationRunner runner(
       std::unique_ptr<mojo::media::audio::examples::PlayWAVApp>(
           new mojo::media::audio::examples::PlayWAVApp()));
   return runner.Run(app_request);
 }