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Have GetActiveChannelCount return the system channels instead of host device channels

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This commit is contained in:
Kelebek1
2023-12-13 06:26:20 +00:00
committed by Liam
parent a093f3d47a
commit ffbba74c91
5 changed files with 43 additions and 20 deletions
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3
src/audio_core/sink/cubeb_sink.cpp
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@@ -253,8 +253,9 @@ CubebSink::~CubebSink() {
#endif
}
SinkStream* CubebSink::AcquireSinkStream(Core::System& system, u32 system_channels,
SinkStream* CubebSink::AcquireSinkStream(Core::System& system, u32 system_channels_,
const std::string& name, StreamType type) {
system_channels = system_channels_;
SinkStreamPtr& stream = sink_streams.emplace_back(std::make_unique<CubebSinkStream>(
ctx, device_channels, system_channels, output_device, input_device, name, type, system));

3
src/audio_core/sink/sdl2_sink.cpp
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@@ -168,8 +168,9 @@ SDLSink::SDLSink(std::string_view target_device_name) {
SDLSink::~SDLSink() = default;
SinkStream* SDLSink::AcquireSinkStream(Core::System& system, u32 system_channels,
SinkStream* SDLSink::AcquireSinkStream(Core::System& system, u32 system_channels_,
const std::string&, StreamType type) {
system_channels = system_channels_;
SinkStreamPtr& stream = sink_streams.emplace_back(std::make_unique<SDLSinkStream>(
device_channels, system_channels, output_device, input_device, type, system));
return stream.get();

12
src/audio_core/sink/sink.h
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@@ -85,9 +85,21 @@ public:
*/
virtual void SetSystemVolume(f32 volume) = 0;
/**
* Get the number of channels the game has set, can be different to the host hardware's support.
* Either 2 or 6.
*
* @return Number of device channels.
*/
u32 GetSystemChannels() const {
return system_channels;
}
protected:
/// Number of device channels supported by the hardware
u32 device_channels{2};
/// Number of channels the game is sending
u32 system_channels{2};
};
using SinkPtr = std::unique_ptr<Sink>;

43
src/audio_core/sink/sink_stream.cpp
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@@ -40,29 +40,38 @@ void SinkStream::AppendBuffer(SinkBuffer& buffer, std::span<s16> samples) {
if (system_channels == 6 && device_channels == 2) {
// We're given 6 channels, but our device only outputs 2, so downmix.
static constexpr std::array<f32, 4> down_mix_coeff{1.0f, 0.707f, 0.251f, 0.707f};
// Front = 1.0
// Center = 0.596
// Back = 0.707
// LFE = 0.354
// 1.0 + 0.596 + 0.707 + 0.354 = 2.657, 1/2.657 = 0.37636f downscale coefficient
static constexpr std::array<f32, 4> down_mix_coeff{0.37636f, 0.22431056f, 0.13323144f,
0.26608652f};
for (u32 read_index = 0, write_index = 0; read_index < samples.size();
read_index += system_channels, write_index += device_channels) {
const auto fl =
static_cast<f32>(samples[read_index + static_cast<u32>(Channels::FrontLeft)]);
const auto fr =
static_cast<f32>(samples[read_index + static_cast<u32>(Channels::FrontRight)]);
const auto c =
static_cast<f32>(samples[read_index + static_cast<u32>(Channels::Center)]);
const auto lfe =
static_cast<f32>(samples[read_index + static_cast<u32>(Channels::LFE)]);
const auto bl =
static_cast<f32>(samples[read_index + static_cast<u32>(Channels::BackLeft)]);
const auto br =
static_cast<f32>(samples[read_index + static_cast<u32>(Channels::BackRight)]);
const auto left_sample{
((Common::FixedPoint<49, 15>(
samples[read_index + static_cast<u32>(Channels::FrontLeft)]) *
down_mix_coeff[0] +
samples[read_index + static_cast<u32>(Channels::Center)] * down_mix_coeff[1] +
samples[read_index + static_cast<u32>(Channels::LFE)] * down_mix_coeff[2] +
samples[read_index + static_cast<u32>(Channels::BackLeft)] * down_mix_coeff[3]) *
volume)
.to_int()};
static_cast<s32>((fl * down_mix_coeff[0] + c * down_mix_coeff[1] +
lfe * down_mix_coeff[2] + bl * down_mix_coeff[3]) *
volume)};
const auto right_sample{
((Common::FixedPoint<49, 15>(
samples[read_index + static_cast<u32>(Channels::FrontRight)]) *
down_mix_coeff[0] +
samples[read_index + static_cast<u32>(Channels::Center)] * down_mix_coeff[1] +
samples[read_index + static_cast<u32>(Channels::LFE)] * down_mix_coeff[2] +
samples[read_index + static_cast<u32>(Channels::BackRight)] * down_mix_coeff[3]) *
volume)
.to_int()};
static_cast<s32>((fr * down_mix_coeff[0] + c * down_mix_coeff[1] +
lfe * down_mix_coeff[2] + br * down_mix_coeff[3]) *
volume)};
samples[write_index + static_cast<u32>(Channels::FrontLeft)] =
static_cast<s16>(std::clamp(left_sample, min, max));