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Engine: pipe-in the EBU R 128 loudness normalization gain stuff

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The idea is that Integrated Loudness is an integral part
of the song, much like knowing it's beginning / ending
in the file, and we must handle it the exact same way,
and pipe it through all the way.

At the same time, `EngineBase` knows Target Level (from settings),
and these two combined tell us the Gain needed to normalize the
Loudness of the particular Song (`EngineBase::Load()` does that).
So the actual backend only needs to handle the Volume.

We don't currently support changing Target Level on the fly.
We don't currently support changing Loudness-normalizing Gain on the fly.

This does not handle the case when the song is loaded from URL
and thus the EBU R 128 measures, that exist, are not nessesairly correct.
This commit is contained in:
Roman Lebedev
2023-06-27 05:05:01 +03:00
committed by Jonas Kvinge
parent 40ef3191fc
commit 13d6cf201f
10 changed files with 63 additions and 19 deletions
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4
src/engine/gstengine.h
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@@ -61,7 +61,7 @@ class GstEngine : public EngineBase, public GstBufferConsumer {
bool Init() override;
EngineBase::State state() const override;
void StartPreloading(const QUrl &media_url, const QUrl &stream_url, const bool force_stop_at_end, const qint64 beginning_nanosec, const qint64 end_nanosec) override;
bool Load(const QUrl &media_url, const QUrl &stream_url, const EngineBase::TrackChangeFlags change, const bool force_stop_at_end, const quint64 beginning_nanosec, const qint64 end_nanosec) override;
bool Load(const QUrl &media_url, const QUrl &stream_url, const EngineBase::TrackChangeFlags change, const bool force_stop_at_end, const quint64 beginning_nanosec, const qint64 end_nanosec, const std::optional<double> ebur128_integrated_loudness_lufs) override;
bool Play(const quint64 offset_nanosec) override;
void Stop(const bool stop_after = false) override;
void Pause() override;
@@ -132,7 +132,7 @@ class GstEngine : public EngineBase, public GstBufferConsumer {
void StopTimers();
std::shared_ptr<GstEnginePipeline> CreatePipeline();
std::shared_ptr<GstEnginePipeline> CreatePipeline(const QUrl &media_url, const QUrl &stream_url, const QByteArray &gst_url, const qint64 end_nanosec);
std::shared_ptr<GstEnginePipeline> CreatePipeline(const QUrl &media_url, const QUrl &stream_url, const QByteArray &gst_url, const qint64 end_nanosec, const double ebur128_loudness_normalizing_gain_db);
void UpdateScope(int chunk_length);