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audio: asio "downmix" 7.1 to stereo (#736)

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## Link to GitHub Issue or related Pull Request, if one exists
#730 

## Description of change
Add an option that extracts channels from 7.1 ASIO and presents to 2-ch
ASIO. Same idea as the SDVX 2ch fix except for gitadora we are
duplicating the center channel to front.

## Testing
Tested SDVX and GFDM Arena.
This commit is contained in:
bicarus
2026-06-06 03:11:40 -07:00
committed by GitHub
parent f23c359114
commit 0457262472
5 changed files with 370 additions and 88 deletions
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src/spice2x/launcher/launcher.cpp
+8 -1
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@@ -498,7 +498,7 @@ int main_implementation(int argc, char *argv[]) {
games::sdvx::ASIO_DRIVER = options[launcher::Options::spice2x_SDVXAsioDriver].value_text();
}
if (options[launcher::Options::SDVXAsioTwoChannel].value_bool()) {
WrappedAsio::FORCE_TWO_CHANNELS = true;
WrappedAsio::STEREO_DOWNMIX = WrappedAsio::StereoDownmix::Front;
}
if (options[launcher::Options::spice2x_SDVXSubPos].is_active()) {
auto txt = options[launcher::Options::spice2x_SDVXSubPos].value_text();
@@ -710,6 +710,7 @@ int main_implementation(int argc, char *argv[]) {
}
if (options[launcher::Options::GitaDoraTwoChannelAudio].value_bool()) {
games::gitadora::TWOCHANNEL = true;
WrappedAsio::STEREO_DOWNMIX = WrappedAsio::StereoDownmix::Center;
}
if (options[launcher::Options::GitaDoraLefty].is_active()) {
const auto text = options[launcher::Options::GitaDoraLefty].value_text();
@@ -1106,6 +1107,12 @@ int main_implementation(int argc, char *argv[]) {
auto &name = options[launcher::Options::DownmixAudioToStereo].value_text();
hooks::audio::DOWNMIX_ALGORITHM = hooks::audio::Downmix::name_to_algorithm(name.c_str());
}
if (options[launcher::Options::AsioDownmixToStereo].is_active()) {
// routes the selected pair onto the device's 2.0 front output; a non-None selection
// implies force-two-channel (see WrappedAsio::force_two_channels)
auto &name = options[launcher::Options::AsioDownmixToStereo].value_text();
WrappedAsio::STEREO_DOWNMIX = WrappedAsio::name_to_stereo_downmix(name.c_str());
}
if (options[launcher::Options::VolumeBoost].is_active()) {
const double decibels = std::strtod(
options[launcher::Options::VolumeBoost].value_text().c_str(), nullptr);