2 files changed, 88 insertions, 2 deletions

diff --git a/src/core/hle/service/audio/audren_u.cpp b/src/core/hle/service/audio/audren_u.cpp
index 38bc65d95..6e8002bc9 100644
--- a/src/core/hle/service/audio/audren_u.cpp
+++ b/src/core/hle/service/audio/audren_u.cpp
@@ -2,6 +2,7 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include "common/alignment.h"
 #include "common/logging/log.h"
 #include "core/core_timing.h"
 #include "core/hle/ipc_helpers.h"
@@ -256,12 +257,62 @@ void AudRenU::OpenAudioRenderer(Kernel::HLERequestContext& ctx) {
 }
 
 void AudRenU::GetAudioRendererWorkBufferSize(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    auto params = rp.PopRaw<WorkerBufferParameters>();
+
+    u64 buffer_sz = Common::AlignUp(4 * params.unknown8, 0x40);
+    buffer_sz += params.unknownC * 1024;
+    buffer_sz += 0x940 * (params.unknownC + 1);
+    buffer_sz += 0x3F0 * params.voice_count;
+    buffer_sz += Common::AlignUp(8 * (params.unknownC + 1), 0x10);
+    buffer_sz += Common::AlignUp(8 * params.voice_count, 0x10);
+    buffer_sz +=
+        Common::AlignUp((0x3C0 * (params.sink_count + params.unknownC) + 4 * params.sample_count) *
+                            (params.unknown8 + 6),
+                        0x40);
+
+    if (IsFeatureSupported(AudioFeatures::Splitter, params.magic)) {
+        u32 count = params.unknownC + 1;
+        u64 node_count = Common::AlignUp(count, 0x40);
+        u64 node_state_buffer_sz =
+            4 * (node_count * node_count) + 0xC * node_count + 2 * (node_count / 8);
+        u64 edge_matrix_buffer_sz = 0;
+        node_count = Common::AlignUp(count * count, 0x40);
+        if (node_count >> 31 != 0) {
+            edge_matrix_buffer_sz = (node_count | 7) / 8;
+        } else {
+            edge_matrix_buffer_sz = node_count / 8;
+        }
+        buffer_sz += Common::AlignUp(node_state_buffer_sz + edge_matrix_buffer_sz, 0x10);
+    }
+
+    buffer_sz += 0x20 * (params.effect_count + 4 * params.voice_count) + 0x50;
+    if (IsFeatureSupported(AudioFeatures::Splitter, params.magic)) {
+        buffer_sz += 0xE0 * params.unknown2c;
+        buffer_sz += 0x20 * params.splitter_count;
+        buffer_sz += Common::AlignUp(4 * params.unknown2c, 0x10);
+    }
+    buffer_sz = Common::AlignUp(buffer_sz, 0x40) + 0x170 * params.sink_count;
+    u64 output_sz = buffer_sz + 0x280 * params.sink_count + 0x4B0 * params.effect_count +
+                    ((params.voice_count * 256) | 0x40);
+
+    if (params.unknown1c >= 1) {
+        output_sz = Common::AlignUp(((16 * params.sink_count + 16 * params.effect_count +
+                                      16 * params.voice_count + 16) +
+                                     0x658) *
+                                            (params.unknown1c + 1) +
+                                        0xc0,
+                                    0x40) +
+                    output_sz;
+    }
+    output_sz = Common::AlignUp(output_sz + 0x1807e, 0x1000);
+
     IPC::ResponseBuilder rb{ctx, 4};
 
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u64>(0x4000);
+    rb.Push<u64>(output_sz);
 
-    NGLOG_WARNING(Service_Audio, "(STUBBED) called");
+    NGLOG_DEBUG(Service_Audio, "called, buffer_size=0x{:X}", output_sz);
 }
 
 void AudRenU::GetAudioDevice(Kernel::HLERequestContext& ctx) {
@@ -273,4 +324,14 @@ void AudRenU::GetAudioDevice(Kernel::HLERequestContext& ctx) {
     NGLOG_DEBUG(Service_Audio, "called");
 }
 
+bool AudRenU::IsFeatureSupported(AudioFeatures feature, u32_le revision) const {
+    u32_be version_num = (revision - Common::MakeMagic('R', 'E', 'V', '0')); // Byte swap
+    switch (feature) {
+    case AudioFeatures::Splitter:
+        return version_num >= 2;
+    default:
+        return false;
+    }
+}
+
 } // namespace Service::Audio
diff --git a/src/core/hle/service/audio/audren_u.h b/src/core/hle/service/audio/audren_u.h
index 71b632e80..fe53de4ce 100644
--- a/src/core/hle/service/audio/audren_u.h
+++ b/src/core/hle/service/audio/audren_u.h
@@ -21,6 +21,31 @@ private:
     void OpenAudioRenderer(Kernel::HLERequestContext& ctx);
     void GetAudioRendererWorkBufferSize(Kernel::HLERequestContext& ctx);
     void GetAudioDevice(Kernel::HLERequestContext& ctx);
+
+    struct WorkerBufferParameters {
+        u32_le sample_rate;
+        u32_le sample_count;
+        u32_le unknown8;
+        u32_le unknownC;
+        u32_le voice_count;
+        u32_le sink_count;
+        u32_le effect_count;
+        u32_le unknown1c;
+        u8 unknown20;
+        u8 padding1[3];
+        u32_le splitter_count;
+        u32_le unknown2c;
+        u8 padding2[4];
+        u32_le magic;
+    };
+    static_assert(sizeof(WorkerBufferParameters) == 52,
+                  "WorkerBufferParameters is an invalid size");
+
+    enum class AudioFeatures : u32 {
+        Splitter,
+    };
+
+    bool IsFeatureSupported(AudioFeatures feature, u32_le revision) const;
 };
 
 } // namespace Service::Audio