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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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11
src/engine/gstenginepipeline.cpp
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@@ -78,6 +78,7 @@ GstEnginePipeline::GstEnginePipeline(QObject *parent)
rg_preamp_(0.0),
rg_fallbackgain_(0.0),
rg_compression_(true),
ebur128_loudness_normalization_(false),
buffer_duration_nanosec_(BackendSettingsPage::kDefaultBufferDuration * kNsecPerMsec),
buffer_low_watermark_(BackendSettingsPage::kDefaultBufferLowWatermark),
buffer_high_watermark_(BackendSettingsPage::kDefaultBufferHighWatermark),
@@ -99,6 +100,7 @@ GstEnginePipeline::GstEnginePipeline(QObject *parent)
pending_seek_nanosec_(-1),
last_known_position_ns_(0),
next_uri_set_(false),
ebur128_loudness_normalizing_gain_db_(0.0),
volume_set_(false),
volume_internal_(-1.0),
volume_percent_(100),
@@ -237,6 +239,12 @@ void GstEnginePipeline::set_replaygain(const bool enabled, const int mode, const
}
void GstEnginePipeline::set_ebur128_loudness_normalization(const bool enabled) {
ebur128_loudness_normalization_ = enabled;
}
void GstEnginePipeline::set_buffer_duration_nanosec(const quint64 buffer_duration_nanosec) {
buffer_duration_nanosec_ = buffer_duration_nanosec;
}
@@ -289,11 +297,12 @@ GstElement *GstEnginePipeline::CreateElement(const QString &factory_name, const
}
bool GstEnginePipeline::InitFromUrl(const QUrl &media_url, const QUrl &stream_url, const QByteArray &gst_url, const qint64 end_nanosec, QString &error) {
bool GstEnginePipeline::InitFromUrl(const QUrl &media_url, const QUrl &stream_url, const QByteArray &gst_url, const qint64 end_nanosec, const double ebur128_loudness_normalizing_gain_db, QString &error) {
media_url_ = media_url;
stream_url_ = stream_url;
gst_url_ = gst_url;
ebur128_loudness_normalizing_gain_db_ = ebur128_loudness_normalizing_gain_db;
end_offset_nanosec_ = end_nanosec;
guint version_major = 0, version_minor = 0, version_micro = 0, version_nano = 0;