125 lines
4.7 KiB
C++
125 lines
4.7 KiB
C++
// Copyright (c) 2019 The Chromium Embedded Framework Authors.
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// Portions copyright (c) 2011 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_capturer.h"
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#include "libcef/browser/browser_host_impl.h"
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#include "components/mirroring/service/captured_audio_input.h"
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#include "content/public/browser/audio_loopback_stream_creator.h"
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#include "media/audio/audio_input_device.h"
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namespace {
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media::ChannelLayout TranslateChannelLayout(
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cef_channel_layout_t channel_layout) {
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// Verify that our enum matches Chromium's values. The enum values match
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// between those enums and existing values don't ever change, so it's enough
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// to check that there are no new ones added.
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static_assert(
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static_cast<int>(CEF_CHANNEL_LAYOUT_MAX) ==
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static_cast<int>(media::CHANNEL_LAYOUT_MAX),
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"cef_channel_layout_t must match the ChannelLayout enum in Chromium");
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return static_cast<media::ChannelLayout>(channel_layout);
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}
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void StreamCreatorHelper(
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content::WebContents* source_web_contents,
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content::AudioLoopbackStreamCreator* audio_stream_creator,
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mojo::PendingRemote<mirroring::mojom::AudioStreamCreatorClient> client,
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const media::AudioParameters& params,
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uint32_t total_segments) {
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audio_stream_creator->CreateLoopbackStream(
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source_web_contents, params, total_segments,
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base::BindRepeating(
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[](mojo::PendingRemote<mirroring::mojom::AudioStreamCreatorClient>
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client,
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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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mojo::Remote<mirroring::mojom::AudioStreamCreatorClient>
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audio_client(std::move(client));
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audio_client->StreamCreated(std::move(stream),
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std::move(client_receiver),
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std::move(data_pipe));
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},
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base::Passed(&client)));
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}
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} // namespace
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CefAudioCapturer::CefAudioCapturer(const CefAudioParameters& params,
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CefRefPtr<CefBrowserHostImpl> browser,
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CefRefPtr<CefAudioHandler> audio_handler)
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: params_(params),
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browser_(browser),
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audio_handler_(audio_handler),
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audio_stream_creator_(content::AudioLoopbackStreamCreator::
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CreateInProcessAudioLoopbackStreamCreator()) {
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media::AudioParameters audio_params(
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media::AudioParameters::AUDIO_PCM_LINEAR,
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TranslateChannelLayout(params.channel_layout), params.sample_rate,
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params.frames_per_buffer);
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if (!audio_params.IsValid()) {
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LOG(ERROR) << "Invalid audio parameters";
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return;
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}
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DCHECK(browser_);
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DCHECK(audio_handler_);
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DCHECK(browser_->web_contents());
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channels_ = audio_params.channels();
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audio_input_device_ = new media::AudioInputDevice(
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std::make_unique<mirroring::CapturedAudioInput>(base::BindRepeating(
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&StreamCreatorHelper, base::Unretained(browser_->web_contents()),
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base::Unretained(audio_stream_creator_.get()))),
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media::AudioInputDevice::kLoopback);
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audio_input_device_->Initialize(audio_params, this);
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audio_input_device_->Start();
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}
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CefAudioCapturer::~CefAudioCapturer() {
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StopStream();
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}
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void CefAudioCapturer::OnCaptureStarted() {
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audio_handler_->OnAudioStreamStarted(browser_, params_, channels_);
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DCHECK(!capturing_);
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capturing_ = true;
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}
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void CefAudioCapturer::Capture(const media::AudioBus* source,
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base::TimeTicks audio_capture_time,
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double /*volume*/,
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bool /*key_pressed*/) {
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const int channels = source->channels();
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std::array<const float*, media::CHANNELS_MAX> data;
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DCHECK(channels == channels_);
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DCHECK(channels <= static_cast<int>(data.size()));
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for (int c = 0; c < channels; ++c) {
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data[c] = source->channel(c);
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}
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base::TimeDelta pts = audio_capture_time - base::TimeTicks::UnixEpoch();
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audio_handler_->OnAudioStreamPacket(browser_, data.data(), source->frames(),
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pts.InMilliseconds());
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}
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void CefAudioCapturer::OnCaptureError(const std::string& message) {
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audio_handler_->OnAudioStreamError(browser_, message);
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StopStream();
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}
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void CefAudioCapturer::StopStream() {
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if (audio_input_device_)
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audio_input_device_->Stop();
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if (capturing_)
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audio_handler_->OnAudioStreamStopped(browser_);
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audio_input_device_ = nullptr;
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capturing_ = false;
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} |