blob: 399c2212ebe0483aec6f26396f9caaef4f46e3ad [file] [log] [blame]
// 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