Revert of MediaCaptureFromElement: add support for audio captureStream().

content/renderer/media/html_audio_element_capturer_source.cc

Index: content/renderer/media/html_audio_element_capturer_source.cc
diff --git a/content/renderer/media/html_audio_element_capturer_source.cc b/content/renderer/media/html_audio_element_capturer_source.cc
deleted file mode 100644
index 399c2212ebe0483aec6f26396f9caaef4f46e3ad..0000000000000000000000000000000000000000
--- a/content/renderer/media/html_audio_element_capturer_source.cc
+++ /dev/null
@@ -1,89 +0,0 @@
-// Copyright 2016 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 "content/renderer/media/html_audio_element_capturer_source.h"
-
-#include "base/threading/thread_task_runner_handle.h"
-#include "media/base/audio_parameters.h"
-#include "media/base/audio_renderer_sink.h"
-#include "media/blink/webaudiosourceprovider_impl.h"
-#include "media/blink/webmediaplayer_impl.h"
-#include "third_party/WebKit/public/platform/WebMediaPlayer.h"
-
-namespace content {
-
-//static
-HtmlAudioElementCapturerSource*
-HtmlAudioElementCapturerSource::CreateFromWebMediaPlayerImpl(
-    blink::WebMediaPlayer* player) {
-  DCHECK(player);
-  return new HtmlAudioElementCapturerSource(
-      static_cast<media::WebAudioSourceProviderImpl*>(
-          player->getAudioSourceProvider()));
-}
-
-HtmlAudioElementCapturerSource::HtmlAudioElementCapturerSource(
-    media::WebAudioSourceProviderImpl* audio_source)
-    : MediaStreamAudioSource(true /* is_local_source */),
-      audio_source_(audio_source),
-      is_started_(false),
-      last_sample_rate_(0),
-      last_num_channels_(0),
-      last_bus_frames_(0) {
-  DCHECK(audio_source_);
-}
-
-HtmlAudioElementCapturerSource::~HtmlAudioElementCapturerSource() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  EnsureSourceIsStopped();
-}
-
-bool HtmlAudioElementCapturerSource::EnsureSourceIsStarted() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  if (audio_source_ && !is_started_) {
-    // base:Unretained() is safe here since EnsureSourceIsStopped() guarantees
-    // no more calls to OnAudioBus().
-    audio_source_->SetCopyAudioCallback(base::Bind(
-        &HtmlAudioElementCapturerSource::OnAudioBus, base::Unretained(this)));
-    is_started_ = true;
-  }
-  return is_started_;
-}
-
-void HtmlAudioElementCapturerSource::EnsureSourceIsStopped() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  if (!is_started_)
-    return;
-
-  if (audio_source_) {
-    audio_source_->ClearCopyAudioCallback();
-    audio_source_ = nullptr;
-  }
-  is_started_ = false;
-}
-
-void HtmlAudioElementCapturerSource::OnAudioBus(
-    std::unique_ptr<media::AudioBus> audio_bus,
-    uint32_t delay_milliseconds,
-    int sample_rate) {
-  const base::TimeTicks capture_time =
-      base::TimeTicks::Now() -
-      base::TimeDelta::FromMilliseconds(delay_milliseconds);
-
-  if (sample_rate != last_sample_rate_ ||
-      audio_bus->channels() != last_num_channels_ ||
-      audio_bus->frames() != last_bus_frames_) {
-    MediaStreamAudioSource::SetFormat(
-        media::AudioParameters(media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
-                               media::GuessChannelLayout(audio_bus->channels()),
-                               sample_rate, 16, audio_bus->frames()));
-    last_sample_rate_ = sample_rate;
-    last_num_channels_ = audio_bus->channels();
-    last_bus_frames_ = audio_bus->frames();
-  }
-
-  MediaStreamAudioSource::DeliverDataToTracks(*audio_bus, capture_time);
-}
-
-}  // namespace content