dryark/strawberry
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

2
src/playlist/playlistitem.h
View File

@@ -87,6 +87,8 @@ class PlaylistItem : public std::enable_shared_from_this<PlaylistItem> {
Song StreamMetadata() { return HasTemporaryMetadata() ? temp_metadata_ : Metadata(); }
QUrl StreamUrl() const { return HasTemporaryMetadata() && temp_metadata_.effective_stream_url().isValid() ? temp_metadata_.effective_stream_url() : Url(); }
std::optional<double> effective_ebur128_integrated_loudness_lufs() const { return HasTemporaryMetadata() && temp_metadata_.is_valid() ? temp_metadata_.ebur128_integrated_loudness_lufs() : Metadata().ebur128_integrated_loudness_lufs(); }
qint64 effective_beginning_nanosec() const { return HasTemporaryMetadata() && temp_metadata_.is_valid() && temp_metadata_.beginning_nanosec() != -1 ? temp_metadata_.beginning_nanosec() : Metadata().beginning_nanosec(); }
qint64 effective_end_nanosec() const { return HasTemporaryMetadata() && temp_metadata_.is_valid() && temp_metadata_.end_nanosec() != -1 ? temp_metadata_.end_nanosec() : Metadata().end_nanosec(); }