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// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qmediaenginetimedtextnotify_p.h"
#include <QtMultimedia/private/qcomtaskresource_p.h>
#include <QtCore/qstring.h>
#include <QtCore/private/qcomptr_p.h>
QT_BEGIN_NAMESPACE
void STDMETHODCALLTYPE QMediaEngineTimedTextNotify::TrackAdded(DWORD trackId)
{
emit trackAdded(trackId);
}
void STDMETHODCALLTYPE QMediaEngineTimedTextNotify::TrackRemoved(DWORD) { }
void STDMETHODCALLTYPE QMediaEngineTimedTextNotify::TrackSelected(DWORD, BOOL) { }
void STDMETHODCALLTYPE QMediaEngineTimedTextNotify::TrackReadyStateChanged(DWORD) { }
void STDMETHODCALLTYPE QMediaEngineTimedTextNotify::Error(MF_TIMED_TEXT_ERROR_CODE, HRESULT, DWORD)
{
}
void STDMETHODCALLTYPE QMediaEngineTimedTextNotify::Cue(MF_TIMED_TEXT_CUE_EVENT cueEvent,
double /*currentTime*/,
IMFTimedTextCue *cue)
{
// Extract text on the MF thread while the cue is still valid.
QString text;
if (cue && cueEvent == MF_TIMED_TEXT_CUE_EVENT_ACTIVE) {
const DWORD lineCount = cue->GetLineCount();
for (DWORD l = 0; l < lineCount; ++l) {
ComPtr<IMFTimedTextFormattedText> line;
if (SUCCEEDED(cue->GetLine(l, &line)) && line) {
QComTaskResource<WCHAR> str;
if (SUCCEEDED(line->GetText(str.address())) && str) {
if (!text.isEmpty())
text += u'\n';
text += QString::fromWCharArray(str.get());
}
}
}
}
// cueEvent == INACTIVE → empty text (clear subtitle)
emit subtitleTextChanged(text);
}
void STDMETHODCALLTYPE QMediaEngineTimedTextNotify::Reset() { }
QT_END_NAMESPACE