1 files changed, 120 insertions, 0 deletions
diff --git a/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegaudiorenderer_p.h b/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegaudiorenderer_p.h
new file mode 100644
index 000000000..196cd4fd0
--- /dev/null
+++ b/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegaudiorenderer_p.h
@@ -0,0 +1,120 @@
+// Copyright (C) 2021 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
+#ifndef QFFMPEGAUDIORENDERER_P_H
+#define QFFMPEGAUDIORENDERER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "playbackengine/qffmpegrenderer_p.h"
+
+#include "qaudiobuffer.h"
+
+QT_BEGIN_NAMESPACE
+
+class QAudioOutput;
+class QAudioSink;
+class QFFmpegResampler;
+
+namespace QFFmpeg {
+
+class AudioRenderer : public Renderer
+{
+    Q_OBJECT
+public:
+    AudioRenderer(const TimeController &tc, QAudioOutput *output);
+
+    void setOutput(QAudioOutput *output);
+
+    ~AudioRenderer() override;
+
+protected:
+    using Microseconds = std::chrono::microseconds;
+    struct SynchronizationStamp
+    {
+        QAudio::State audioSinkState = QAudio::IdleState;
+        qsizetype audioSinkBytesFree = 0;
+        qsizetype bufferBytesWritten = 0;
+        TimePoint timePoint = TimePoint::max();
+    };
+
+    struct BufferLoadingInfo
+    {
+        enum Type { Low, Moderate, High };
+        Type type = Moderate;
+        TimePoint timePoint = TimePoint::max();
+        Microseconds delay = Microseconds(0);
+    };
+
+    struct AudioTimings
+    {
+        Microseconds actualBufferDuration = Microseconds(0);
+        Microseconds maxSoundDelay = Microseconds(0);
+        Microseconds minSoundDelay = Microseconds(0);
+    };
+
+    struct BufferedDataWithOffset
+    {
+        QAudioBuffer buffer;
+        qsizetype offset = 0;
+
+        bool isValid() const { return buffer.isValid(); }
+        qsizetype size() const { return buffer.byteCount() - offset; }
+        const char *data() const { return buffer.constData<char>() + offset; }
+    };
+
+    RenderingResult renderInternal(Frame frame) override;
+
+    void onPlaybackRateChanged() override;
+
+    int timerInterval() const override;
+
+    void onPauseChanged() override;
+
+    void freeOutput();
+
+    void updateOutput(const Codec *codec);
+
+    void initResempler(const Codec *codec);
+
+    void onDeviceChanged();
+
+    void updateVolume();
+
+    void updateSynchronization(const SynchronizationStamp &stamp, const Frame &frame);
+
+    Microseconds bufferLoadingTime(const SynchronizationStamp &syncStamp) const;
+
+    void onAudioSinkStateChanged(QAudio::State state);
+
+    Microseconds durationForBytes(qsizetype bytes) const;
+
+private:
+    QPointer<QAudioOutput> m_output;
+    std::unique_ptr<QAudioSink> m_sink;
+    AudioTimings m_timings;
+    BufferLoadingInfo m_bufferLoadingInfo;
+    std::unique_ptr<QFFmpegResampler> m_resampler;
+    QAudioFormat m_format;
+
+    BufferedDataWithOffset m_bufferedData;
+    QIODevice *m_ioDevice = nullptr;
+
+    bool m_deviceChanged = false;
+    bool m_drained = false;
+    bool m_firstFrame = true;
+};
+
+} // namespace QFFmpeg
+
+QT_END_NAMESPACE
+
+#endif // QFFMPEGAUDIORENDERER_P_H