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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/media/audio_loopback_stream_broker.h"
#include <utility>
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/unguessable_token.h"
#include "content/browser/media/audio_stream_broker_helper.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "media/mojo/mojom/audio_stream_factory.mojom.h"
namespace content {
AudioLoopbackStreamBroker::AudioLoopbackStreamBroker(
int render_process_id,
int render_frame_id,
AudioStreamBroker::LoopbackSource* source,
const media::AudioParameters& params,
uint32_t shared_memory_count,
bool mute_source,
AudioStreamBroker::DeleterCallback deleter,
mojo::PendingRemote<blink::mojom::RendererAudioInputStreamFactoryClient>
renderer_factory_client)
: AudioStreamBroker(render_process_id, render_frame_id),
source_(source),
params_(params),
shared_memory_count_(shared_memory_count),
deleter_(std::move(deleter)),
renderer_factory_client_(std::move(renderer_factory_client)) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(source_);
DCHECK(renderer_factory_client_);
DCHECK(deleter_);
if (mute_source) {
muter_.emplace(source_->GetGroupID());
}
// Unretained is safe because |this| owns |renderer_factory_client_|.
renderer_factory_client_.set_disconnect_handler(base::BindOnce(
&AudioLoopbackStreamBroker::Cleanup, base::Unretained(this)));
// Notify the source that we are capturing from it.
source_->AddLoopbackSink(this);
NotifyFrameHostOfAudioStreamStarted(render_process_id, render_frame_id,
/*is_capturing=*/true);
}
AudioLoopbackStreamBroker::~AudioLoopbackStreamBroker() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (source_)
source_->RemoveLoopbackSink(this);
NotifyFrameHostOfAudioStreamStopped(render_process_id(), render_frame_id(),
/*is_capturing=*/true);
}
void AudioLoopbackStreamBroker::CreateStream(
media::mojom::AudioStreamFactory* factory) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(!observer_receiver_.is_bound());
DCHECK(!client_receiver_);
DCHECK(source_);
if (muter_) // Mute the source.
muter_->Connect(factory);
mojo::PendingRemote<media::mojom::AudioInputStreamClient> client;
client_receiver_ = client.InitWithNewPipeAndPassReceiver();
mojo::PendingRemote<media::mojom::AudioInputStream> stream;
mojo::PendingReceiver<media::mojom::AudioInputStream> stream_receiver =
stream.InitWithNewPipeAndPassReceiver();
factory->CreateLoopbackStream(
std::move(stream_receiver), std::move(client),
observer_receiver_.BindNewPipeAndPassRemote(), params_,
shared_memory_count_, source_->GetGroupID(),
base::BindOnce(&AudioLoopbackStreamBroker::StreamCreated,
weak_ptr_factory_.GetWeakPtr(), std::move(stream)));
// Unretained is safe because |this| owns |observer_receiver_|.
observer_receiver_.set_disconnect_handler(base::BindOnce(
&AudioLoopbackStreamBroker::Cleanup, base::Unretained(this)));
}
void AudioLoopbackStreamBroker::OnSourceGone() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
// No further access to |source_| is allowed.
source_ = nullptr;
Cleanup();
}
void AudioLoopbackStreamBroker::DidStartRecording() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
}
void AudioLoopbackStreamBroker::StreamCreated(
mojo::PendingRemote<media::mojom::AudioInputStream> stream,
media::mojom::ReadWriteAudioDataPipePtr data_pipe) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!data_pipe) {
Cleanup();
return;
}
DCHECK(renderer_factory_client_);
renderer_factory_client_->StreamCreated(
std::move(stream), std::move(client_receiver_), std::move(data_pipe),
false /* |initially_muted|: Loopback streams are never muted. */,
std::nullopt /* |stream_id|: Loopback streams don't have ids */);
}
void AudioLoopbackStreamBroker::Cleanup() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
std::move(deleter_).Run(this);
}
} // namespace content
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