133 lines
5.1 KiB
C++
133 lines
5.1 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "libcef/browser/audio_loopback_stream_creator.h"
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#include <memory>
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#include <utility>
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#include "base/bind.h"
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#include "base/check_op.h"
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#include "base/location.h"
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#include "content/browser/browser_main_loop.h"
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#include "content/browser/web_contents/web_contents_impl.h"
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#include "content/public/browser/browser_task_traits.h"
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#include "content/public/browser/browser_thread.h"
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#include "content/public/browser/render_frame_host.h"
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#include "media/audio/audio_device_description.h"
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#include "media/base/user_input_monitor.h"
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#include "mojo/public/cpp/bindings/pending_remote.h"
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#include "mojo/public/cpp/bindings/self_owned_receiver.h"
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#include "third_party/blink/public/mojom/media/renderer_audio_input_stream_factory.mojom.h"
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namespace {
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// A blink::mojom::RendererAudioInputStreamFactoryClient that holds a
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// CefAudioLoopbackStreamCreator::StreamCreatedCallback. The callback runs when
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// the requested audio stream is created.
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class StreamCreatedCallbackAdapter final
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: public blink::mojom::RendererAudioInputStreamFactoryClient {
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public:
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explicit StreamCreatedCallbackAdapter(
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const CefAudioLoopbackStreamCreator::StreamCreatedCallback& callback)
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: callback_(callback) {
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DCHECK(callback_);
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}
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~StreamCreatedCallbackAdapter() override {}
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// blink::mojom::RendererAudioInputStreamFactoryClient implementation.
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void StreamCreated(
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mojo::PendingRemote<media::mojom::AudioInputStream> stream,
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mojo::PendingReceiver<media::mojom::AudioInputStreamClient>
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client_receiver,
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media::mojom::ReadOnlyAudioDataPipePtr data_pipe,
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bool initially_muted,
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const absl::optional<base::UnguessableToken>& stream_id) override {
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DCHECK(!initially_muted); // Loopback streams shouldn't be started muted.
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callback_.Run(std::move(stream), std::move(client_receiver),
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std::move(data_pipe));
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}
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private:
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const CefAudioLoopbackStreamCreator::StreamCreatedCallback callback_;
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DISALLOW_COPY_AND_ASSIGN(StreamCreatedCallbackAdapter);
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};
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void CreateLoopbackStreamHelper(
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content::ForwardingAudioStreamFactory::Core* factory,
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content::AudioStreamBroker::LoopbackSource* loopback_source,
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const media::AudioParameters& params,
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uint32_t total_segments,
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mojo::PendingRemote<blink::mojom::RendererAudioInputStreamFactoryClient>
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client_remote) {
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DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
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const bool mute_source = true;
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factory->CreateLoopbackStream(-1, -1, loopback_source, params, total_segments,
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mute_source, std::move(client_remote));
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}
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void CreateSystemWideLoopbackStreamHelper(
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content::ForwardingAudioStreamFactory::Core* factory,
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const media::AudioParameters& params,
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uint32_t total_segments,
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mojo::PendingRemote<blink::mojom::RendererAudioInputStreamFactoryClient>
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client_remote) {
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DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
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const bool enable_agc = false;
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factory->CreateInputStream(
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-1, -1, media::AudioDeviceDescription::kLoopbackWithMuteDeviceId, params,
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total_segments, enable_agc, std::move(client_remote));
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}
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} // namespace
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CefAudioLoopbackStreamCreator::CefAudioLoopbackStreamCreator()
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: factory_(nullptr,
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content::BrowserMainLoop::GetInstance()
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? static_cast<media::UserInputMonitorBase*>(
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content::BrowserMainLoop::GetInstance()
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->user_input_monitor())
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: nullptr,
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content::AudioStreamBrokerFactory::CreateImpl()) {
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DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
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}
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CefAudioLoopbackStreamCreator::~CefAudioLoopbackStreamCreator() {
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DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
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}
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void CefAudioLoopbackStreamCreator::CreateLoopbackStream(
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content::WebContents* loopback_source,
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const media::AudioParameters& params,
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uint32_t total_segments,
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const StreamCreatedCallback& callback) {
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DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
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mojo::PendingRemote<blink::mojom::RendererAudioInputStreamFactoryClient>
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client;
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mojo::MakeSelfOwnedReceiver(
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std::make_unique<StreamCreatedCallbackAdapter>(callback),
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client.InitWithNewPipeAndPassReceiver());
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// Deletion of factory_.core() is posted to the IO thread when |factory_| is
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// destroyed, so Unretained is safe below.
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if (loopback_source) {
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content::GetIOThreadTaskRunner({})->PostTask(
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FROM_HERE,
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base::BindOnce(&CreateLoopbackStreamHelper, factory_.core(),
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static_cast<content::WebContentsImpl*>(loopback_source)
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->GetAudioStreamFactory()
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->core(),
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params, total_segments, std::move(client)));
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return;
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}
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// A null |frame_of_source_web_contents| requests system-wide loopback.
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content::GetIOThreadTaskRunner({})->PostTask(
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FROM_HERE,
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base::BindOnce(&CreateSystemWideLoopbackStreamHelper, factory_.core(),
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params, total_segments, std::move(client)));
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}
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