audren: Make use of nodiscard, rework downmixing, release all buffers

Preliminary work for upmixing & general cleanup. Fixes basic issues in games such as Shovel Knight and slightly improves the LEGO games. Upmixing stitll needs to be implemented.

Audio levels in a few games will be fixed as we now use the downmix coefficients when possible instead of supplying our own

1 files changed, 16 insertions, 2 deletions

diff --git a/src/audio_core/sink_context.cpp b/src/audio_core/sink_context.cpp
index 0882b411a..cdb47ba81 100644
--- a/src/audio_core/sink_context.cpp
+++ b/src/audio_core/sink_context.cpp
@@ -12,10 +12,16 @@ std::size_t SinkContext::GetCount() const {
     return sink_count;
 }
 
-void SinkContext::UpdateMainSink(SinkInfo::InParams& in) {
+void SinkContext::UpdateMainSink(const SinkInfo::InParams& in) {
+    ASSERT(in.type == SinkTypes::Device);
+
+    downmix = in.device.down_matrix_enabled;
+    if (downmix) {
+        downmix_coefficients = in.device.down_matrix_coef;
+    }
     in_use = in.in_use;
     use_count = in.device.input_count;
-    std::memcpy(buffers.data(), in.device.input.data(), AudioCommon::MAX_CHANNEL_COUNT);
+    buffers = in.device.input;
 }
 
 bool SinkContext::InUse() const {
@@ -28,4 +34,12 @@ std::vector<u8> SinkContext::OutputBuffers() const {
     return buffer_ret;
 }
 
+bool SinkContext::HasDownMixingCoefficients() const {
+    return downmix;
+}
+
+const std::array<float_le, 4>& SinkContext::GetDownmixCoefficients() const {
+    return downmix_coefficients;
+}
+
 } // namespace AudioCore