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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/glic/media/glic_media_integration.h"
#include "base/feature_list.h"
#include "base/no_destructor.h"
#include "base/supports_user_data.h"
#include "chrome/browser/accessibility/live_caption/live_caption_controller_factory.h"
#include "chrome/browser/glic/media/glic_media_context.h"
#include "chrome/browser/glic/media/glic_media_page_cache.h"
#include "chrome/browser/profiles/profile.h"
#include "components/live_caption/caption_controller_base.h"
#include "components/live_caption/caption_util.h"
#include "components/live_caption/live_caption_controller.h"
#include "components/live_caption/pref_names.h"
#include "components/optimization_guide/content/browser/page_content_proto_provider.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/peer_connection_tracker_host_observer.h"
#include "content/public/browser/web_contents.h"
#include "media/base/media_switches.h"
namespace {
constexpr char kGlicMediaIntegrationKey[] = "GlicMediaIntegration";
class GlicMediaPeerConnectionObserver
: public content::PeerConnectionTrackerHostObserver {
public:
~GlicMediaPeerConnectionObserver() override = default;
void OnPeerConnectionAdded(
content::GlobalRenderFrameHostId render_frame_host_id,
int lid,
base::ProcessId pid,
const std::string& url,
const std::string& rtc_configuration) override {
auto* rfh = content::RenderFrameHost::FromID(render_frame_host_id);
if (!rfh) {
return;
}
auto* wc = content::WebContents::FromRenderFrameHost(rfh);
if (!wc) {
return;
}
auto* context = glic::GlicMediaContext::GetOrCreateFor(wc);
if (!context) {
return;
}
context->OnPeerConnectionAdded();
}
};
class GlicMediaIntegrationImpl : public glic::GlicMediaIntegration,
public base::SupportsUserData::Data {
public:
explicit GlicMediaIntegrationImpl(Profile*);
~GlicMediaIntegrationImpl() override = default;
// glic::GlicMediaIntegration
void AppendContext(
content::WebContents* web_contents,
optimization_guide::proto::ContentNode* context_root) override;
void OnPeerConnectionAddedForTesting(content::WebContents*) override;
void OnContextUpdated(glic::GlicMediaContext* context);
protected:
raw_ptr<Profile> profile_;
// Don't let the transcript grow unbounded.
static constexpr size_t max_size_bytes_ = 20000;
glic::GlicMediaPageCache page_cache_;
std::unique_ptr<GlicMediaPeerConnectionObserver> rtc_observer_;
};
class CaptionListenerImpl : public captions::CaptionControllerBase::Listener {
public:
explicit CaptionListenerImpl(Profile* profile) : profile_(profile) {}
~CaptionListenerImpl() override = default;
bool OnTranscription(content::WebContents* web_contents,
captions::CaptionBubbleContext*,
const media::SpeechRecognitionResult& result) override {
bool continue_transcribing = false;
if (auto* context = glic::GlicMediaContext::GetOrCreateFor(web_contents)) {
continue_transcribing = context->OnResult(result);
static_cast<GlicMediaIntegrationImpl*>(
glic::GlicMediaIntegration::GetFor(web_contents))
->OnContextUpdated(context);
}
return continue_transcribing;
}
void OnAudioStreamEnd(content::WebContents*,
captions::CaptionBubbleContext*) override {}
void OnLanguageIdentificationEvent(
content::WebContents*,
captions::CaptionBubbleContext*,
const media::mojom::LanguageIdentificationEventPtr&) override {}
private:
raw_ptr<Profile> profile_;
};
GlicMediaIntegrationImpl::GlicMediaIntegrationImpl(Profile* profile)
: profile_(profile),
rtc_observer_(std::make_unique<GlicMediaPeerConnectionObserver>()) {
auto* lc = captions::LiveCaptionControllerFactory::GetForProfile(profile_);
lc->AddListener(std::make_unique<CaptionListenerImpl>(profile));
// For now, enable the pref if we get this far. Do this after getting the
// Live Caption controller, since it resets the pref to false.
profile->GetPrefs()->SetBoolean(prefs::kHeadlessCaptionEnabled, true);
}
void GlicMediaIntegrationImpl::AppendContext(
content::WebContents* web_contents,
optimization_guide::proto::ContentNode* context_root) {
context_root->mutable_content_attributes()->set_attribute_type(
optimization_guide::proto::CONTENT_ATTRIBUTE_TEXT);
auto* context = glic::GlicMediaContext::GetIfExistsFor(web_contents);
std::string result;
if (context != nullptr) {
result = context->GetContext();
}
// Provide a default.
if (result.length() == 0) {
result = "There is no transcript available.";
}
// Trim to `max_size_bytes_`. Note that we should utf8-trim.
if (size_t result_size = result.length()) {
if (result_size > max_size_bytes_) {
// Remove the beginning of the result, leaving the end.
result = result.substr(result_size - max_size_bytes_);
}
}
// Include the entire context in one node. This could be split into multiple
// nodes too.
context_root->mutable_content_attributes()
->mutable_text_data()
->set_text_content(std::move(result));
}
void GlicMediaIntegrationImpl::OnContextUpdated(
glic::GlicMediaContext* context) {
page_cache_.PlaceAtFront(context);
}
void GlicMediaIntegrationImpl::OnPeerConnectionAddedForTesting(
content::WebContents* web_contents) {
auto id = web_contents->GetPrimaryMainFrame()->GetGlobalId();
rtc_observer_->OnPeerConnectionAdded(id, /*lid=*/0, /*pid=*/{}, /*url=*/"",
/*rtc_configuration=*/"");
}
} // namespace
namespace glic {
// static
GlicMediaIntegration* GlicMediaIntegration::GetFor(content::WebContents* wc) {
// This should also check the pref, once it's not toggled automatically.
// We'll want to install a pref listener, and possibly clean up if the pref
// is switched off after construction.
if (!wc || !captions::IsHeadlessCaptionFeatureSupported()) {
return nullptr;
}
Profile* profile = Profile::FromBrowserContext(wc->GetBrowserContext());
if (!profile) {
return nullptr;
}
auto* data = static_cast<GlicMediaIntegrationImpl*>(
profile->GetUserData(kGlicMediaIntegrationKey));
if (!data) {
auto new_data = std::make_unique<GlicMediaIntegrationImpl>(profile);
data = new_data.get();
profile->SetUserData(kGlicMediaIntegrationKey, std::move(new_data));
}
return data;
}
} // namespace glic
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