[audio_core/hid] Audio REV12+15 support + HID fixes (#2719)

This fixes newer updates / games.

Implements partial audio rev15, rev13, rev12 and HID issues on SDK20+ games.

Credits to LotP (Ryubing) and Zephyron (Citron) for their research and implementation.

Co-authored-by: Zephyron <zephyron@citron-emu.org>
Co-authored-by: Shinmegumi <shinmegumi@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2719
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: unknown <sahyno1996@gmail.com>
Co-committed-by: unknown <sahyno1996@gmail.com>

27 files changed, 728 insertions, 37 deletions

diff --git a/src/audio_core/common/feature_support.h b/src/audio_core/common/feature_support.h
index 91d6991416..4585be45ef 100644
--- a/src/audio_core/common/feature_support.h
+++ b/src/audio_core/common/feature_support.h
@@ -16,7 +16,7 @@
 #include <ranges>
 
 namespace AudioCore {
-constexpr u32 CurrentRevision = 16;
+constexpr u32 CurrentRevision = 15;
 
 enum class SupportTags {
     CommandProcessingTimeEstimatorVersion4,
@@ -47,6 +47,10 @@ enum class SupportTags {
     DelayChannelMappingChange,
     ReverbChannelMappingChange,
     I3dl2ReverbChannelMappingChange,
+    SplitterPrevVolumeReset,
+    SplitterBiquadFilterParameter,
+    SplitterDestinationV2b,
+    VoiceInParameterV2,
 
     // Not a real tag, just here to get the count.
     Size
@@ -91,6 +95,10 @@ constexpr bool CheckFeatureSupported(SupportTags tag, u32 user_revision) {
             {SupportTags::DelayChannelMappingChange, 11},
             {SupportTags::ReverbChannelMappingChange, 11},
             {SupportTags::I3dl2ReverbChannelMappingChange, 11},
+            {SupportTags::SplitterBiquadFilterParameter, 12},
+            {SupportTags::SplitterPrevVolumeReset, 13},
+            {SupportTags::SplitterDestinationV2b, 15},
+            {SupportTags::VoiceInParameterV2, 15},
         }};
 
     const auto& feature =
diff --git a/src/audio_core/renderer/behavior/behavior_info.cpp b/src/audio_core/renderer/behavior/behavior_info.cpp
index d0df1f29de..63b80c503a 100644
--- a/src/audio_core/renderer/behavior/behavior_info.cpp
+++ b/src/audio_core/renderer/behavior/behavior_info.cpp
@@ -193,4 +193,20 @@ bool BehaviorInfo::IsI3dl2ReverbChannelMappingChanged() const {
     return CheckFeatureSupported(SupportTags::I3dl2ReverbChannelMappingChange, user_revision);
 }
 
+bool BehaviorInfo::IsSplitterPrevVolumeResetSupported() const {
+    return CheckFeatureSupported(SupportTags::SplitterPrevVolumeReset, user_revision);
+}
+
+bool BehaviorInfo::IsSplitterDestinationV2bSupported() const {
+    return CheckFeatureSupported(SupportTags::SplitterDestinationV2b, user_revision);
+}
+
+bool BehaviorInfo::IsVoiceInParameterV2Supported() const {
+    return CheckFeatureSupported(SupportTags::VoiceInParameterV2, user_revision);
+}
+
+bool BehaviorInfo::IsBiquadFilterParameterForSplitterEnabled() const {
+    return CheckFeatureSupported(SupportTags::SplitterBiquadFilterParameter, user_revision);
+}
+
 } // namespace AudioCore::Renderer
diff --git a/src/audio_core/renderer/behavior/behavior_info.h b/src/audio_core/renderer/behavior/behavior_info.h
index a4958857a4..757f163c5a 100644
--- a/src/audio_core/renderer/behavior/behavior_info.h
+++ b/src/audio_core/renderer/behavior/behavior_info.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -361,6 +364,38 @@ public:
      */
     bool IsI3dl2ReverbChannelMappingChanged() const;
 
+    /**
+     * Check if explicit previous mix volume reset is supported for splitters.
+     * This allows splitters to explicitly reset their previous mix volumes instead of
+     * doing so implicitly on first use.
+     *
+     * @return True if supported, otherwise false.
+     */
+    bool IsSplitterPrevVolumeResetSupported() const;
+
+    /**
+     * Check if splitter destination v2b parameter format is supported (revision 15+).
+     * This uses the extended parameter format with biquad filter fields.
+     *
+     * @return True if supported, otherwise false.
+     */
+    bool IsSplitterDestinationV2bSupported() const;
+
+    /**
+     * Check if voice input parameter v2 format is supported (revision 15+).
+     * This uses the extended parameter format with float biquad filters.
+     *
+     * @return True if supported, otherwise false.
+     */
+    bool IsVoiceInParameterV2Supported() const;
+
+    /**
+     * Check if splitter destinations can carry biquad filter parameters (revision 12+).
+     *
+     * @return True if supported, otherwise false.
+     */
+    bool IsBiquadFilterParameterForSplitterEnabled() const;
+
     /// Host version
     u32 process_revision;
     /// User version
diff --git a/src/audio_core/renderer/behavior/info_updater.cpp b/src/audio_core/renderer/behavior/info_updater.cpp
index 20f6cda3a2..39bbc91ded 100644
--- a/src/audio_core/renderer/behavior/info_updater.cpp
+++ b/src/audio_core/renderer/behavior/info_updater.cpp
@@ -64,8 +64,6 @@ Result InfoUpdater::UpdateVoices(VoiceContext& voice_context,
     const PoolMapper pool_mapper(process_handle, memory_pools, memory_pool_count,
                                  behaviour.IsMemoryForceMappingEnabled());
     const auto voice_count{voice_context.GetCount()};
-    std::span<const VoiceInfo::InParameter> in_params{
-        reinterpret_cast<const VoiceInfo::InParameter*>(input), voice_count};
     std::span<VoiceInfo::OutStatus> out_params{reinterpret_cast<VoiceInfo::OutStatus*>(output),
                                                voice_count};
 
@@ -76,8 +74,104 @@ Result InfoUpdater::UpdateVoices(VoiceContext& voice_context,
 
     u32 new_voice_count{0};
 
+    // Two input formats exist: legacy (0x170) and v2 with float biquad (0x188).
+    const bool use_v2 = behaviour.IsVoiceInParameterV2Supported();
+    const u32 in_stride = use_v2 ? 0x188u : static_cast<u32>(sizeof(VoiceInfo::InParameter));
+
     for (u32 i = 0; i < voice_count; i++) {
-        const auto& in_param{in_params[i]};
+        VoiceInfo::InParameter local_in{};
+        std::array<VoiceInfo::BiquadFilterParameter2, MaxBiquadFilters> float_biquads{};
+
+        if (!use_v2) {
+            const auto* in_param_ptr = reinterpret_cast<const VoiceInfo::InParameter*>(
+                input + i * sizeof(VoiceInfo::InParameter));
+            local_in = *in_param_ptr;
+        } else {
+            struct VoiceInParameterV2 {
+                u32 id;
+                u32 node_id;
+                bool is_new;
+                bool in_use;
+                PlayState play_state;
+                SampleFormat sample_format;
+                u32 sample_rate;
+                u32 priority;
+                u32 sort_order;
+                u32 channel_count;
+                f32 pitch;
+                f32 volume;
+                // Two BiquadFilterParameter2 (0x18 each) -> ignored/converted
+                struct BiquadV2 {
+                    bool enable;
+                    u8 r1;
+                    u8 r2;
+                    u8 r3;
+                    std::array<f32, 3> b;
+                    std::array<f32, 2> a;
+                } biquads[2];
+                u32 wave_buffer_count;
+                u32 wave_buffer_index;
+                u32 reserved1;
+                u64 src_data_address;
+                u64 src_data_size;
+                s32 mix_id;
+                u32 splitter_id;
+                std::array<VoiceInfo::WaveBufferInternal, MaxWaveBuffers> wavebuffers;
+                std::array<u32, MaxChannels> channel_resource_ids;
+                bool clear_voice_drop;
+                u8 flush_wave_buffer_count;
+                u16 reserved2;
+                VoiceInfo::Flags flags;
+                SrcQuality src_quality;
+                u32 external_ctx;
+                u32 external_ctx_size;
+                u32 reserved3[2];
+            };
+            const auto* vin = reinterpret_cast<const VoiceInParameterV2*>(input + i * in_stride);
+            local_in.id = vin->id;
+            local_in.node_id = vin->node_id;
+            local_in.is_new = vin->is_new;
+            local_in.in_use = vin->in_use;
+            local_in.play_state = vin->play_state;
+            local_in.sample_format = vin->sample_format;
+            local_in.sample_rate = vin->sample_rate;
+            local_in.priority = static_cast<s32>(vin->priority);
+            local_in.sort_order = static_cast<s32>(vin->sort_order);
+            local_in.channel_count = vin->channel_count;
+            local_in.pitch = vin->pitch;
+            local_in.volume = vin->volume;
+
+            // For REV15+, we keep float coefficients separate and only convert for compatibility
+            for (size_t filter_idx = 0; filter_idx < MaxBiquadFilters; filter_idx++) {
+                const auto& src = vin->biquads[filter_idx];
+                auto& dst = local_in.biquads[filter_idx];
+                dst.enabled = src.enable;
+                // Convert float coefficients to fixed-point Q2.14 for legacy path
+                dst.b[0] = static_cast<s16>(std::clamp(src.b[0] * 16384.0f, -32768.0f, 32767.0f));
+                dst.b[1] = static_cast<s16>(std::clamp(src.b[1] * 16384.0f, -32768.0f, 32767.0f));
+                dst.b[2] = static_cast<s16>(std::clamp(src.b[2] * 16384.0f, -32768.0f, 32767.0f));
+                dst.a[0] = static_cast<s16>(std::clamp(src.a[0] * 16384.0f, -32768.0f, 32767.0f));
+                dst.a[1] = static_cast<s16>(std::clamp(src.a[1] * 16384.0f, -32768.0f, 32767.0f));
+
+                // Also store the native float version
+                float_biquads[filter_idx].enabled = src.enable;
+                float_biquads[filter_idx].numerator = src.b;
+                float_biquads[filter_idx].denominator = src.a;
+            }
+            local_in.wave_buffer_count = vin->wave_buffer_count;
+            local_in.wave_buffer_index = static_cast<u16>(vin->wave_buffer_index);
+            local_in.src_data_address = static_cast<CpuAddr>(vin->src_data_address);
+            local_in.src_data_size = vin->src_data_size;
+            local_in.mix_id = static_cast<u32>(vin->mix_id);
+            local_in.splitter_id = vin->splitter_id;
+            local_in.wave_buffer_internal = vin->wavebuffers;
+            local_in.channel_resource_ids = vin->channel_resource_ids;
+            local_in.clear_voice_drop = vin->clear_voice_drop;
+            local_in.flush_buffer_count = vin->flush_wave_buffer_count;
+            local_in.flags = vin->flags;
+            local_in.src_quality = vin->src_quality;
+        }
+        const auto& in_param = local_in;
         std::array<VoiceState*, MaxChannels> voice_states{};
 
         if (!in_param.in_use) {
@@ -101,6 +195,14 @@ Result InfoUpdater::UpdateVoices(VoiceContext& voice_context,
         BehaviorInfo::ErrorInfo update_error{};
         voice_info.UpdateParameters(update_error, in_param, pool_mapper, behaviour);
 
+        // For REV15+, store the native float biquad coefficients
+        if (use_v2) {
+            voice_info.use_float_biquads = true;
+            voice_info.biquads_float = float_biquads;
+        } else {
+            voice_info.use_float_biquads = false;
+        }
+
         if (!update_error.error_code.IsSuccess()) {
             behaviour.AppendError(update_error);
         }
@@ -121,7 +223,7 @@ Result InfoUpdater::UpdateVoices(VoiceContext& voice_context,
         new_voice_count += in_param.channel_count;
     }
 
-    auto consumed_input_size{voice_count * static_cast<u32>(sizeof(VoiceInfo::InParameter))};
+    auto consumed_input_size{voice_count * in_stride};
     auto consumed_output_size{voice_count * static_cast<u32>(sizeof(VoiceInfo::OutStatus))};
     if (consumed_input_size != in_header->voices_size) {
         LOG_ERROR(Service_Audio, "Consumed an incorrect voices size, header size={}, consumed={}",
@@ -257,18 +359,31 @@ Result InfoUpdater::UpdateMixes(MixContext& mix_context, const u32 mix_buffer_co
                                 EffectContext& effect_context, SplitterContext& splitter_context) {
     s32 mix_count{0};
     u32 consumed_input_size{0};
+    u32 input_mix_size{0};
 
     if (behaviour.IsMixInParameterDirtyOnlyUpdateSupported()) {
         auto in_dirty_params{reinterpret_cast<const MixInfo::InDirtyParameter*>(input)};
         mix_count = in_dirty_params->count;
+
+        // Validate against expected header size to ensure structure is correct
+        if (mix_count < 0 || mix_count > 0x100) {
+            LOG_ERROR(
+                Service_Audio,
+                "Invalid mix count from dirty parameter: count={}, magic=0x{:X}, expected_size={}",
+                mix_count, in_dirty_params->magic, in_header->mix_size);
+            return Service::Audio::ResultInvalidUpdateInfo;
+        }
+
+        consumed_input_size += static_cast<u32>(sizeof(MixInfo::InDirtyParameter));
         input += sizeof(MixInfo::InDirtyParameter);
-        consumed_input_size = static_cast<u32>(sizeof(MixInfo::InDirtyParameter) +
-                                               mix_count * sizeof(MixInfo::InParameter));
     } else {
         mix_count = mix_context.GetCount();
-        consumed_input_size = static_cast<u32>(mix_count * sizeof(MixInfo::InParameter));
     }
 
+    input_mix_size = static_cast<u32>(mix_count * sizeof(MixInfo::InParameter));
+    consumed_input_size += input_mix_size;
+
+
     if (mix_buffer_count == 0) {
         return Service::Audio::ResultInvalidUpdateInfo;
     }
diff --git a/src/audio_core/renderer/command/command_buffer.cpp b/src/audio_core/renderer/command/command_buffer.cpp
index d680e0c74b..a0a574fc64 100644
--- a/src/audio_core/renderer/command/command_buffer.cpp
+++ b/src/audio_core/renderer/command/command_buffer.cpp
@@ -237,6 +237,13 @@ void CommandBuffer::GenerateBiquadFilterCommand(const s32 node_id, VoiceInfo& vo
 
     cmd.biquad = voice_info.biquads[biquad_index];
 
+    if (voice_info.use_float_biquads) {
+        cmd.biquad_float = voice_info.biquads_float[biquad_index];
+        cmd.use_float_coefficients = true;
+    } else {
+        cmd.use_float_coefficients = false;
+    }
+
     cmd.state = memory_pool->Translate(CpuAddr(voice_state.biquad_states[biquad_index].data()),
                                        MaxBiquadFilters * sizeof(VoiceState::BiquadFilterState));
 
@@ -263,6 +270,9 @@ void CommandBuffer::GenerateBiquadFilterCommand(const s32 node_id, EffectInfoBas
     cmd.biquad.b = parameter.b;
     cmd.biquad.a = parameter.a;
 
+    // Effects use legacy fixed-point format
+    cmd.use_float_coefficients = false;
+
     cmd.state = memory_pool->Translate(CpuAddr(state),
                                        MaxBiquadFilters * sizeof(VoiceState::BiquadFilterState));
 
@@ -658,6 +668,13 @@ void CommandBuffer::GenerateMultitapBiquadFilterCommand(const s32 node_id, Voice
     cmd.output = buffer_count + channel;
     cmd.biquads = voice_info.biquads;
 
+    if (voice_info.use_float_biquads) {
+        cmd.biquads_float = voice_info.biquads_float;
+        cmd.use_float_coefficients = true;
+    } else {
+        cmd.use_float_coefficients = false;
+    }
+
     cmd.states[0] =
         memory_pool->Translate(CpuAddr(voice_state.biquad_states[0].data()),
                                MaxBiquadFilters * sizeof(VoiceState::BiquadFilterState));
diff --git a/src/audio_core/renderer/command/effect/biquad_filter.cpp b/src/audio_core/renderer/command/effect/biquad_filter.cpp
index 539e0c6370..4ad3184079 100644
--- a/src/audio_core/renderer/command/effect/biquad_filter.cpp
+++ b/src/audio_core/renderer/command/effect/biquad_filter.cpp
@@ -52,6 +52,40 @@ void ApplyBiquadFilterFloat(std::span<s32> output, std::span<const s32> input,
 }
 
 /**
+ * Biquad filter float implementation with native float coefficients.
+ */
+void ApplyBiquadFilterFloat2(std::span<s32> output, std::span<const s32> input,
+                             std::array<f32, 3>& b, std::array<f32, 2>& a,
+                             VoiceState::BiquadFilterState& state, const u32 sample_count) {
+    constexpr f64 min{std::numeric_limits<s32>::min()};
+    constexpr f64 max{std::numeric_limits<s32>::max()};
+
+    std::array<f64, 3> b_double{static_cast<f64>(b[0]), static_cast<f64>(b[1]),
+                                static_cast<f64>(b[2])};
+    std::array<f64, 2> a_double{static_cast<f64>(a[0]), static_cast<f64>(a[1])};
+    std::array<f64, 4> s{Common::BitCast<f64>(state.s0), Common::BitCast<f64>(state.s1),
+                         Common::BitCast<f64>(state.s2), Common::BitCast<f64>(state.s3)};
+
+    for (u32 i = 0; i < sample_count; i++) {
+        f64 in_sample{static_cast<f64>(input[i])};
+        auto sample{in_sample * b_double[0] + s[0] * b_double[1] + s[1] * b_double[2] +
+                    s[2] * a_double[0] + s[3] * a_double[1]};
+
+        output[i] = static_cast<s32>(std::clamp(sample, min, max));
+
+        s[1] = s[0];
+        s[0] = in_sample;
+        s[3] = s[2];
+        s[2] = sample;
+    }
+
+    state.s0 = Common::BitCast<s64>(s[0]);
+    state.s1 = Common::BitCast<s64>(s[1]);
+    state.s2 = Common::BitCast<s64>(s[2]);
+    state.s3 = Common::BitCast<s64>(s[3]);
+}
+
+/**
  * Biquad filter s32 implementation.
  *
  * @param output       - Output container for filtered samples.
@@ -98,8 +132,14 @@ void BiquadFilterCommand::Process(const AudioRenderer::CommandListProcessor& pro
         processor.mix_buffers.subspan(output * processor.sample_count, processor.sample_count)};
 
     if (use_float_processing) {
-        ApplyBiquadFilterFloat(output_buffer, input_buffer, biquad.b, biquad.a, *state_,
-                               processor.sample_count);
+        // REV15+: Use native float coefficients if available
+        if (use_float_coefficients) {
+            ApplyBiquadFilterFloat2(output_buffer, input_buffer, biquad_float.numerator,
+                                    biquad_float.denominator, *state_, processor.sample_count);
+        } else {
+            ApplyBiquadFilterFloat(output_buffer, input_buffer, biquad.b, biquad.a, *state_,
+                                   processor.sample_count);
+        }
     } else {
         ApplyBiquadFilterInt(output_buffer, input_buffer, biquad.b, biquad.a, *state_,
                              processor.sample_count);
diff --git a/src/audio_core/renderer/command/effect/biquad_filter.h b/src/audio_core/renderer/command/effect/biquad_filter.h
index 0e903930a6..0e1893e536 100644
--- a/src/audio_core/renderer/command/effect/biquad_filter.h
+++ b/src/audio_core/renderer/command/effect/biquad_filter.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -50,12 +53,16 @@ struct BiquadFilterCommand : ICommand {
     s16 output;
     /// Input parameters for biquad
     VoiceInfo::BiquadFilterParameter biquad;
+    /// Input parameters for biquad (REV15+ native float)
+    VoiceInfo::BiquadFilterParameter2 biquad_float;
     /// Biquad state, updated each call
     CpuAddr state;
     /// If true, reset the state
     bool needs_init;
     /// If true, use float processing rather than int
     bool use_float_processing;
+    /// If true, use native float coefficients (REV15+)
+    bool use_float_coefficients;
 };
 
 /**
@@ -72,4 +79,18 @@ void ApplyBiquadFilterFloat(std::span<s32> output, std::span<const s32> input,
                             std::array<s16, 3>& b, std::array<s16, 2>& a,
                             VoiceState::BiquadFilterState& state, const u32 sample_count);
 
+/**
+ * Biquad filter float implementation with native float coefficients (SDK REV15+).
+ *
+ * @param output       - Output container for filtered samples.
+ * @param input        - Input container for samples to be filtered.
+ * @param b            - Feedforward coefficients (float).
+ * @param a            - Feedback coefficients (float).
+ * @param state        - State to track previous samples.
+ * @param sample_count - Number of samples to process.
+ */
+void ApplyBiquadFilterFloat2(std::span<s32> output, std::span<const s32> input,
+                             std::array<f32, 3>& b, std::array<f32, 2>& a,
+                             VoiceState::BiquadFilterState& state, const u32 sample_count);
+
 } // namespace AudioCore::Renderer
diff --git a/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.cpp b/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.cpp
index 208bbeaf29..2dfbcf6145 100644
--- a/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.cpp
+++ b/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.cpp
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -33,8 +36,14 @@ void MultiTapBiquadFilterCommand::Process(const AudioRenderer::CommandListProces
             *state = {};
         }
 
-        ApplyBiquadFilterFloat(output_buffer, input_buffer, biquads[i].b, biquads[i].a, *state,
-                               processor.sample_count);
+        // REV15+: Use native float coefficients if available
+        if (use_float_coefficients) {
+            ApplyBiquadFilterFloat2(output_buffer, input_buffer, biquads_float[i].numerator,
+                                    biquads_float[i].denominator, *state, processor.sample_count);
+        } else {
+            ApplyBiquadFilterFloat(output_buffer, input_buffer, biquads[i].b, biquads[i].a, *state,
+                                   processor.sample_count);
+        }
     }
 }
 
diff --git a/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.h b/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.h
index 50fce80b0c..35fa76f62d 100644
--- a/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.h
+++ b/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -49,12 +52,16 @@ struct MultiTapBiquadFilterCommand : ICommand {
     s16 output;
     /// Biquad parameters
     std::array<VoiceInfo::BiquadFilterParameter, MaxBiquadFilters> biquads;
+    /// Biquad parameters (REV15+ native float)
+    std::array<VoiceInfo::BiquadFilterParameter2, MaxBiquadFilters> biquads_float;
     /// Biquad states, updated each call
     std::array<CpuAddr, MaxBiquadFilters> states;
     /// If each biquad needs initialisation
     std::array<bool, MaxBiquadFilters> needs_init;
     /// Number of active biquads
     u8 filter_tap_count;
+    /// If true, use native float coefficients (REV15+)
+    bool use_float_coefficients;
 };
 
 } // namespace AudioCore::Renderer
diff --git a/src/audio_core/renderer/splitter/splitter_context.cpp b/src/audio_core/renderer/splitter/splitter_context.cpp
index fb118e981e..1ba5daebe9 100644
--- a/src/audio_core/renderer/splitter/splitter_context.cpp
+++ b/src/audio_core/renderer/splitter/splitter_context.cpp
@@ -35,12 +35,16 @@ SplitterDestinationData& SplitterContext::GetData(const u32 index) {
 
 void SplitterContext::Setup(std::span<SplitterInfo> splitter_infos_, const u32 splitter_info_count_,
                             SplitterDestinationData* splitter_destinations_,
-                            const u32 destination_count_, const bool splitter_bug_fixed_) {
+                            const u32 destination_count_, const bool splitter_bug_fixed_,
+                            const BehaviorInfo& behavior) {
     splitter_infos = splitter_infos_;
     info_count = splitter_info_count_;
     splitter_destinations = splitter_destinations_;
     destinations_count = destination_count_;
     splitter_bug_fixed = splitter_bug_fixed_;
+    splitter_prev_volume_reset_supported = behavior.IsSplitterPrevVolumeResetSupported();
+    splitter_biquad_param_supported = behavior.IsBiquadFilterParameterForSplitterEnabled();
+    splitter_float_coeff_supported = behavior.IsSplitterDestinationV2bSupported();
 }
 
 bool SplitterContext::UsingSplitter() const {
@@ -84,7 +88,7 @@ bool SplitterContext::Initialize(const BehaviorInfo& behavior,
         }
 
         Setup(splitter_infos, params.splitter_infos, splitter_destinations,
-              params.splitter_destinations, behavior.IsSplitterBugFixed());
+              params.splitter_destinations, behavior.IsSplitterBugFixed(), behavior);
     }
     return true;
 }
@@ -137,19 +141,104 @@ u32 SplitterContext::UpdateInfo(const u8* input, u32 offset, const u32 splitter_
 
 u32 SplitterContext::UpdateData(const u8* input, u32 offset, const u32 count) {
     for (u32 i = 0; i < count; i++) {
-        auto data_header{
-            reinterpret_cast<const SplitterDestinationData::InParameter*>(input + offset)};
-
-        if (data_header->magic != GetSplitterSendDataMagic()) {
-            continue;
-        }
-
-        if (data_header->id < 0 || data_header->id > destinations_count) {
-            continue;
+        // Version selection based on feature flags:
+        // - REV12: integer biquad params (Version2a)
+        // - REV15: float coeff/biquad v2b
+        // - older: no biquad fields
+        if (!splitter_biquad_param_supported) {
+            const auto* data_header =
+                reinterpret_cast<const SplitterDestinationData::InParameter*>(input + offset);
+
+            if (data_header->magic != GetSplitterSendDataMagic()) {
+                continue;
+            }
+            if (data_header->id < 0 || data_header->id > destinations_count) {
+                continue;
+            }
+
+            auto modified_params = *data_header;
+            if (!splitter_prev_volume_reset_supported) {
+                modified_params.reset_prev_volume = false;
+            }
+            splitter_destinations[data_header->id].Update(modified_params);
+            offset += sizeof(SplitterDestinationData::InParameter);
+        } else if (!splitter_float_coeff_supported) {
+            // Version 2a: struct contains legacy fixed-point biquad filter fields (REV12+)
+            const auto* data_header_v2a =
+                reinterpret_cast<const SplitterDestinationData::InParameterVersion2a*>(input +
+                                                                                       offset);
+
+            if (data_header_v2a->magic != GetSplitterSendDataMagic()) {
+                continue;
+            }
+            if (data_header_v2a->id < 0 || data_header_v2a->id > destinations_count) {
+                continue;
+            }
+
+            // Map common fields to the base format
+            SplitterDestinationData::InParameter mapped{};
+            mapped.magic = data_header_v2a->magic;
+            mapped.id = data_header_v2a->id;
+            mapped.mix_volumes = data_header_v2a->mix_volumes;
+            mapped.mix_id = data_header_v2a->mix_id;
+            mapped.in_use = data_header_v2a->in_use;
+            mapped.reset_prev_volume =
+                splitter_prev_volume_reset_supported ? data_header_v2a->reset_prev_volume : false;
+
+            auto& destination = splitter_destinations[data_header_v2a->id];
+            destination.Update(mapped);
+
+            // Convert legacy fixed-point biquad params into float representation
+            auto biquad_filters = destination.GetBiquadFilters();
+            for (size_t filter_idx = 0; filter_idx < MaxBiquadFilters; filter_idx++) {
+                const auto& legacy = data_header_v2a->biquad_filters[filter_idx];
+                auto& out = biquad_filters[filter_idx];
+                out.enabled = legacy.enabled;
+                // s16 fixed-point scale: use Q14 like voices (b and a are s16, 1.0 ~= 1<<14)
+                constexpr float scale = 1.0f / static_cast<float>(1 << 14);
+                out.numerator[0] = static_cast<float>(legacy.b[0]) * scale;
+                out.numerator[1] = static_cast<float>(legacy.b[1]) * scale;
+                out.numerator[2] = static_cast<float>(legacy.b[2]) * scale;
+                out.denominator[0] = static_cast<float>(legacy.a[0]) * scale;
+                out.denominator[1] = static_cast<float>(legacy.a[1]) * scale;
+            }
+
+            offset += static_cast<u32>(sizeof(SplitterDestinationData::InParameterVersion2a));
+        } else {
+            // Version 2b: struct contains extra biquad filter fields with float coeffs
+            const auto* data_header_v2b =
+                reinterpret_cast<const SplitterDestinationData::InParameterVersion2b*>(input +
+                                                                                       offset);
+
+            if (data_header_v2b->magic != GetSplitterSendDataMagic()) {
+                continue;
+            }
+            if (data_header_v2b->id < 0 || data_header_v2b->id > destinations_count) {
+                continue;
+            }
+
+            // Map common fields to the old format
+            SplitterDestinationData::InParameter mapped{};
+            mapped.magic = data_header_v2b->magic;
+            mapped.id = data_header_v2b->id;
+            mapped.mix_volumes = data_header_v2b->mix_volumes;
+            mapped.mix_id = data_header_v2b->mix_id;
+            mapped.in_use = data_header_v2b->in_use;
+            mapped.reset_prev_volume =
+                splitter_prev_volume_reset_supported ? data_header_v2b->reset_prev_volume : false;
+
+            // Store biquad filters from V2b (REV15+)
+            auto& destination = splitter_destinations[data_header_v2b->id];
+            destination.Update(mapped);
+
+            // Copy biquad filter parameters
+            auto biquad_filters = destination.GetBiquadFilters();
+            for (size_t filter_idx = 0; filter_idx < MaxBiquadFilters; filter_idx++) {
+                biquad_filters[filter_idx] = data_header_v2b->biquad_filters[filter_idx];
+            }
+
+            offset += static_cast<u32>(sizeof(SplitterDestinationData::InParameterVersion2b));
         }
-
-        splitter_destinations[data_header->id].Update(*data_header);
-        offset += sizeof(SplitterDestinationData::InParameter);
     }
 
     return offset;
diff --git a/src/audio_core/renderer/splitter/splitter_context.h b/src/audio_core/renderer/splitter/splitter_context.h
index 1c0b846719..c71ce3d7c4 100644
--- a/src/audio_core/renderer/splitter/splitter_context.h
+++ b/src/audio_core/renderer/splitter/splitter_context.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -168,10 +171,11 @@ private:
      * @param splitter_destinations - Workbuffer for splitter destinations.
      * @param destination_count     - Number of destinations in the workbuffer.
      * @param splitter_bug_fixed    - Is the splitter bug fixed?
+     * @param behavior               - Behavior info for feature support.
      */
     void Setup(std::span<SplitterInfo> splitter_infos, u32 splitter_info_count,
                SplitterDestinationData* splitter_destinations, u32 destination_count,
-               bool splitter_bug_fixed);
+               bool splitter_bug_fixed, const BehaviorInfo& behavior);
 
     /// Workbuffer for splitters
     std::span<SplitterInfo> splitter_infos{};
@@ -183,6 +187,12 @@ private:
     s32 destinations_count{};
     /// Is the splitter bug fixed?
     bool splitter_bug_fixed{};
+    /// Is explicit previous mix volume reset supported?
+    bool splitter_prev_volume_reset_supported{};
+    /// Is biquad filter parameter for splitter (REV12) supported?
+    bool splitter_biquad_param_supported{};
+    /// Is float coefficient/biquad filter v2b parameter supported?
+    bool splitter_float_coeff_supported{};
 };
 
 } // namespace Renderer
diff --git a/src/audio_core/renderer/splitter/splitter_destinations_data.cpp b/src/audio_core/renderer/splitter/splitter_destinations_data.cpp
index 5ec37e48e1..028cee9853 100644
--- a/src/audio_core/renderer/splitter/splitter_destinations_data.cpp
+++ b/src/audio_core/renderer/splitter/splitter_destinations_data.cpp
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -84,4 +87,14 @@ void SplitterDestinationData::SetNext(SplitterDestinationData* next_) {
     next = next_;
 }
 
+std::span<SplitterDestinationData::BiquadFilterParameter2>
+SplitterDestinationData::GetBiquadFilters() {
+    return biquad_filters;
+}
+
+std::span<const SplitterDestinationData::BiquadFilterParameter2>
+SplitterDestinationData::GetBiquadFilters() const {
+    return biquad_filters;
+}
+
 } // namespace AudioCore::Renderer
diff --git a/src/audio_core/renderer/splitter/splitter_destinations_data.h b/src/audio_core/renderer/splitter/splitter_destinations_data.h
index 90edfc667c..6bfe5e0e34 100644
--- a/src/audio_core/renderer/splitter/splitter_destinations_data.h
+++ b/src/audio_core/renderer/splitter/splitter_destinations_data.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -16,16 +19,72 @@ namespace AudioCore::Renderer {
  */
 class SplitterDestinationData {
 public:
+    /**
+     * Biquad filter parameter with float coefficients (SDK REV15+).
+     * Defined here to avoid circular dependency with VoiceInfo.
+     */
+    struct BiquadFilterParameter2 {
+        /* 0x00 */ bool enabled;
+        /* 0x01 */ u8 reserved1;
+        /* 0x02 */ u8 reserved2;
+        /* 0x03 */ u8 reserved3;
+        /* 0x04 */ std::array<f32, 3> numerator;   // b0, b1, b2
+        /* 0x10 */ std::array<f32, 2> denominator; // a1, a2 (a0 = 1)
+    };
+    static_assert(sizeof(BiquadFilterParameter2) == 0x18,
+                  "BiquadFilterParameter2 has the wrong size!");
+
+    /**
+     * Legacy biquad filter parameter with fixed-point coefficients (SDK REV12+ for splitters).
+     * Matches the old voice biquad format.
+     */
+    struct BiquadFilterParameterLegacy {
+        /* 0x00 */ bool enabled;
+        /* 0x02 */ std::array<s16, 3> b; // numerator
+        /* 0x08 */ std::array<s16, 2> a; // denominator (a0 = 1)
+    };
+    static_assert(sizeof(BiquadFilterParameterLegacy) == 0xC,
+                  "BiquadFilterParameterLegacy has the wrong size!");
+
     struct InParameter {
         /* 0x00 */ u32 magic; // 'SNDD'
         /* 0x04 */ s32 id;
         /* 0x08 */ std::array<f32, MaxMixBuffers> mix_volumes;
         /* 0x68 */ u32 mix_id;
         /* 0x6C */ bool in_use;
+        /* 0x6D */ bool reset_prev_volume;
     };
     static_assert(sizeof(InParameter) == 0x70,
                   "SplitterDestinationData::InParameter has the wrong size!");
 
+    struct InParameterVersion2a {
+        /* 0x00 */ u32 magic; // 'SNDD'
+        /* 0x04 */ s32 id;
+        /* 0x08 */ std::array<f32, MaxMixBuffers> mix_volumes;
+        /* 0x68 */ u32 mix_id;
+        /* 0x6C */ std::array<SplitterDestinationData::BiquadFilterParameterLegacy, MaxBiquadFilters>
+            biquad_filters;
+        /* 0x84 */ bool in_use;
+        /* 0x85 */ bool reset_prev_volume; // only effective if supported
+        /* 0x86 */ u8 reserved[10];
+    };
+    static_assert(sizeof(InParameterVersion2a) == 0x90,
+                  "SplitterDestinationData::InParameterVersion2a has the wrong size!");
+
+    struct InParameterVersion2b {
+        /* 0x00 */ u32 magic; // 'SNDD'
+        /* 0x04 */ s32 id;
+        /* 0x08 */ std::array<f32, MaxMixBuffers> mix_volumes;
+        /* 0x68 */ u32 mix_id;
+        /* 0x6C */ std::array<SplitterDestinationData::BiquadFilterParameter2, MaxBiquadFilters>
+            biquad_filters;
+        /* 0x9C */ bool in_use;
+        /* 0x9D */ bool reset_prev_volume;
+        /* 0x9E */ u8 reserved[10];
+    };
+    static_assert(sizeof(InParameterVersion2b) == 0xA8,
+                  "SplitterDestinationData::InParameterVersion2b has the wrong size!");
+
     SplitterDestinationData(s32 id);
 
     /**
@@ -78,7 +137,7 @@ public:
     f32 GetMixVolumePrev(u32 index) const;
 
     /**
-     * Get the previous mix volumes for all mix buffers in this destination.
+     * Get the previous mix volumes for all mix buffers.
      *
      * @return Span of previous mix buffer volumes.
      */
@@ -115,6 +174,20 @@ public:
      */
     void SetNext(SplitterDestinationData* next);
 
+    /**
+     * Get biquad filter parameters for this destination (REV15+ or mapped from REV12).
+     *
+     * @return Span of biquad filter parameters.
+     */
+    std::span<BiquadFilterParameter2> GetBiquadFilters();
+
+    /**
+     * Get const biquad filter parameters for this destination (REV15+ or mapped from REV12).
+     *
+     * @return Const span of biquad filter parameters.
+     */
+    std::span<const BiquadFilterParameter2> GetBiquadFilters() const;
+
 private:
     /// Id of this destination
     const s32 id;
@@ -124,6 +197,8 @@ private:
     std::array<f32, MaxMixBuffers> mix_volumes{0.0f};
     /// Previous mix volumes
     std::array<f32, MaxMixBuffers> prev_mix_volumes{0.0f};
+    /// Biquad filter parameters (REV15+ or mapped from REV12)
+    std::array<BiquadFilterParameter2, MaxBiquadFilters> biquad_filters{};
     /// Next destination in the mix chain
     SplitterDestinationData* next{};
     /// Is this destination in use?
diff --git a/src/audio_core/renderer/voice/voice_info.h b/src/audio_core/renderer/voice/voice_info.h
index 14a687dcb7..595150f232 100644
--- a/src/audio_core/renderer/voice/voice_info.h
+++ b/src/audio_core/renderer/voice/voice_info.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -135,6 +138,17 @@ public:
     static_assert(sizeof(BiquadFilterParameter) == 0xC,
                   "VoiceInfo::BiquadFilterParameter has the wrong size!");
 
+    struct BiquadFilterParameter2 {
+        /* 0x00 */ bool enabled;
+        /* 0x01 */ u8 reserved1;
+        /* 0x02 */ u8 reserved2;
+        /* 0x03 */ u8 reserved3;
+        /* 0x04 */ std::array<f32, 3> numerator;   // b0, b1, b2
+        /* 0x10 */ std::array<f32, 2> denominator; // a1, a2 (a0 = 1)
+    };
+    static_assert(sizeof(BiquadFilterParameter2) == 0x18,
+                  "VoiceInfo::BiquadFilterParameter2 has the wrong size!");
+
     struct InParameter {
         /* 0x000 */ u32 id;
         /* 0x004 */ u32 node_id;
@@ -168,6 +182,43 @@ public:
     };
     static_assert(sizeof(InParameter) == 0x170, "VoiceInfo::InParameter has the wrong size!");
 
+    struct InParameter2 {
+        /* 0x000 */ u32 id;
+        /* 0x004 */ u32 node_id;
+        /* 0x008 */ bool is_new;
+        /* 0x009 */ bool in_use;
+        /* 0x00A */ PlayState play_state;
+        /* 0x00B */ SampleFormat sample_format;
+        /* 0x00C */ u32 sample_rate;
+        /* 0x010 */ s32 priority;
+        /* 0x014 */ s32 sort_order;
+        /* 0x018 */ u32 channel_count;
+        /* 0x01C */ f32 pitch;
+        /* 0x020 */ f32 volume;
+        /* 0x024 */ std::array<BiquadFilterParameter2, MaxBiquadFilters> biquads;
+        /* 0x054 */ u32 wave_buffer_count;
+        /* 0x058 */ u32 wave_buffer_index;
+        /* 0x05C */ u32 reserved1;
+        /* 0x060 */ CpuAddr src_data_address;
+        /* 0x068 */ u64 src_data_size;
+        /* 0x070 */ u32 mix_id;
+        /* 0x074 */ u32 splitter_id;
+        /* 0x078 */ std::array<WaveBufferInternal, MaxWaveBuffers> wave_buffer_internal;
+        /* 0x158 */ std::array<s32, MaxChannels> channel_resource_ids;
+        /* 0x170 */ bool clear_voice_drop;
+        /* 0x171 */ u8 flush_buffer_count;
+        /* 0x172 */ u16 reserved2;
+        /* 0x174 */ Flags flags;
+        /* 0x175 */ u8 reserved3;
+        /* 0x176 */ SrcQuality src_quality;
+        /* 0x177 */ u8 reserved4;
+        /* 0x178 */ u32 external_context;
+        /* 0x17C */ u32 external_context_size;
+        /* 0x180 */ u32 reserved5;
+        /* 0x184 */ u32 reserved6;
+    };
+    static_assert(sizeof(InParameter2) == 0x188, "VoiceInfo::InParameter2 has the wrong size!");
+
     struct OutStatus {
         /* 0x00 */ u64 played_sample_count;
         /* 0x08 */ u32 wave_buffers_consumed;
@@ -349,6 +400,10 @@ public:
     f32 prev_volume{};
     /// Biquad filters for generating filter commands on this voice
     std::array<BiquadFilterParameter, MaxBiquadFilters> biquads{};
+    /// Float biquad filters for REV15+ (native float coefficients)
+    std::array<BiquadFilterParameter2, MaxBiquadFilters> biquads_float{};
+    /// Use float biquad coefficients (REV15+)
+    bool use_float_biquads{};
     /// Number of active wavebuffers
     u32 wave_buffer_count{};
     /// Current playing wavebuffer index
diff --git a/src/core/hle/service/am/service/library_applet_creator.cpp b/src/core/hle/service/am/service/library_applet_creator.cpp
index 54790838e0..e38729e70a 100644
--- a/src/core/hle/service/am/service/library_applet_creator.cpp
+++ b/src/core/hle/service/am/service/library_applet_creator.cpp
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -175,6 +178,7 @@ ILibraryAppletCreator::ILibraryAppletCreator(Core::System& system_, std::shared_
         {0, D<&ILibraryAppletCreator::CreateLibraryApplet>, "CreateLibraryApplet"},
         {1, nullptr, "TerminateAllLibraryApplets"},
         {2, nullptr, "AreAnyLibraryAppletsLeft"},
+        {3, D<&ILibraryAppletCreator::CreateLibraryAppletEx>, "CreateLibraryAppletEx"},
         {10, D<&ILibraryAppletCreator::CreateStorage>, "CreateStorage"},
         {11, D<&ILibraryAppletCreator::CreateTransferMemoryStorage>, "CreateTransferMemoryStorage"},
         {12, D<&ILibraryAppletCreator::CreateHandleStorage>, "CreateHandleStorage"},
@@ -210,6 +214,32 @@ Result ILibraryAppletCreator::CreateLibraryApplet(
     R_SUCCEED();
 }
 
+Result ILibraryAppletCreator::CreateLibraryAppletEx(
+    Out<SharedPointer<ILibraryAppletAccessor>> out_library_applet_accessor, AppletId applet_id,
+    LibraryAppletMode library_applet_mode, u64 thread_id) {
+    LOG_DEBUG(Service_AM, "called with applet_id={} applet_mode={} thread_id={}", applet_id,
+              library_applet_mode, thread_id);
+
+    std::shared_ptr<ILibraryAppletAccessor> library_applet;
+    if (ShouldCreateGuestApplet(applet_id)) {
+        library_applet =
+            CreateGuestApplet(system, m_window_system, m_applet, applet_id, library_applet_mode);
+    }
+    if (!library_applet) {
+        library_applet =
+            CreateFrontendApplet(system, m_window_system, m_applet, applet_id, library_applet_mode);
+    }
+    if (!library_applet) {
+        LOG_ERROR(Service_AM, "Applet doesn't exist! applet_id={}", applet_id);
+        R_THROW(ResultUnknown);
+    }
+
+    // Applet is created, can now be launched.
+    m_applet->library_applet_launchable_event.Signal();
+    *out_library_applet_accessor = library_applet;
+    R_SUCCEED();
+}
+
 Result ILibraryAppletCreator::CreateStorage(Out<SharedPointer<IStorage>> out_storage, s64 size) {
     LOG_DEBUG(Service_AM, "called, size={}", size);
 
diff --git a/src/core/hle/service/am/service/library_applet_creator.h b/src/core/hle/service/am/service/library_applet_creator.h
index a10a769828..34e7586e8f 100644
--- a/src/core/hle/service/am/service/library_applet_creator.h
+++ b/src/core/hle/service/am/service/library_applet_creator.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -24,6 +27,9 @@ private:
     Result CreateLibraryApplet(
         Out<SharedPointer<ILibraryAppletAccessor>> out_library_applet_accessor, AppletId applet_id,
         LibraryAppletMode library_applet_mode);
+    Result CreateLibraryAppletEx(
+        Out<SharedPointer<ILibraryAppletAccessor>> out_library_applet_accessor, AppletId applet_id,
+        LibraryAppletMode library_applet_mode, u64 thread_id);
     Result CreateStorage(Out<SharedPointer<IStorage>> out_storage, s64 size);
     Result CreateTransferMemoryStorage(
         Out<SharedPointer<IStorage>> out_storage, bool is_writable, s64 size,
diff --git a/src/core/hle/service/ns/application_manager_interface.cpp b/src/core/hle/service/ns/application_manager_interface.cpp
index 60ecd5c2b9..461f134bfd 100644
--- a/src/core/hle/service/ns/application_manager_interface.cpp
+++ b/src/core/hle/service/ns/application_manager_interface.cpp
@@ -128,6 +128,7 @@ IApplicationManagerInterface::IApplicationManagerInterface(Core::System& system_
         {406, nullptr, "GetApplicationControlProperty"},
         {407, nullptr, "ListApplicationTitle"},
         {408, nullptr, "ListApplicationIcon"},
+        {419, D<&IApplicationManagerInterface::RequestDownloadApplicationControlDataInBackground>, "RequestDownloadApplicationControlDataInBackground"},
         {502, nullptr, "RequestCheckGameCardRegistration"},
         {503, nullptr, "RequestGameCardRegistrationGoldPoint"},
         {504, nullptr, "RequestRegisterGameCard"},
@@ -210,6 +211,7 @@ IApplicationManagerInterface::IApplicationManagerInterface(Core::System& system_
         {1703, nullptr, "GetApplicationViewDownloadErrorContext"},
         {1704, D<&IApplicationManagerInterface::GetApplicationViewWithPromotionInfo>, "GetApplicationViewWithPromotionInfo"},
         {1705, nullptr, "IsPatchAutoDeletableApplication"},
+        {1706, D<&IApplicationManagerInterface::Unknown1706>, "Unknown1706"},
         {1800, nullptr, "IsNotificationSetupCompleted"},
         {1801, nullptr, "GetLastNotificationInfoCount"},
         {1802, nullptr, "ListLastNotificationInfo"},
@@ -309,6 +311,7 @@ IApplicationManagerInterface::IApplicationManagerInterface(Core::System& system_
         {4022, D<&IApplicationManagerInterface::Unknown4022>, "Unknown4022"},
         {4023, D<&IApplicationManagerInterface::Unknown4023>, "Unknown4023"},
         {4088, D<&IApplicationManagerInterface::Unknown4022>, "Unknown4088"},
+        {4053, D<&IApplicationManagerInterface::Unknown4053>, "Unknown4053"},
         {9999, nullptr, "GetApplicationCertificate"},
     };
     // clang-format on
@@ -526,6 +529,37 @@ Result IApplicationManagerInterface::GetApplicationTerminateResult(Out<Result> o
     R_SUCCEED();
 }
 
+Result IApplicationManagerInterface::RequestDownloadApplicationControlDataInBackground(
+    u64 unk, u64 application_id) {
+    LOG_WARNING(Service_NS, "(STUBBED), app={:016X} unk={}", application_id, unk);
+    R_SUCCEED();
+}
+
+Result IApplicationManagerInterface::Unknown1706(
+    OutBuffer<BufferAttr_HipcAutoSelect> out_buffer_58,
+    InBuffer<BufferAttr_HipcMapAlias> in_buffer_8) {
+    LOG_WARNING(Service_NS, "(STUBBED) Unknown1706 called: out_size={} in_size={}",
+                out_buffer_58.size(), in_buffer_8.size());
+
+    if (out_buffer_58.size() < 0x58 || in_buffer_8.size() < 0x8) {
+        R_THROW(ResultUnknown);
+    }
+
+    u64 application_id = 0;
+    std::memcpy(&application_id, in_buffer_8.data(), sizeof(u64));
+
+    ApplicationView view{};
+    view.application_id = application_id;
+    view.unk = 0x70000;
+    view.flags = 0x401f17;
+
+    std::memset(out_buffer_58.data(), 0, out_buffer_58.size());
+    std::memcpy(out_buffer_58.data(), &view, sizeof(ApplicationView));
+
+
+    R_SUCCEED();
+}
+
 Result IApplicationManagerInterface::Unknown4022(
     OutCopyHandle<Kernel::KReadableEvent> out_event) {
     LOG_WARNING(Service_NS, "(STUBBED) called");
@@ -539,4 +573,9 @@ Result IApplicationManagerInterface::Unknown4023(Out<u64> out_result) {
     R_SUCCEED();
 }
 
+Result IApplicationManagerInterface::Unknown4053() {
+    LOG_WARNING(Service_NS, "(STUBBED) called.");
+    R_SUCCEED();
+}
+
 } // namespace Service::NS
diff --git a/src/core/hle/service/ns/application_manager_interface.h b/src/core/hle/service/ns/application_manager_interface.h
index 251f93ee06..e181960396 100644
--- a/src/core/hle/service/ns/application_manager_interface.h
+++ b/src/core/hle/service/ns/application_manager_interface.h
@@ -55,6 +55,12 @@ public:
     Result GetApplicationTerminateResult(Out<Result> out_result, u64 application_id);
     Result Unknown4022(OutCopyHandle<Kernel::KReadableEvent> out_event);
     Result Unknown4023(Out<u64> out_result);
+    Result Unknown4053();
+
+    Result RequestDownloadApplicationControlDataInBackground(u64 unk,
+                                                             u64 application_id);
+    Result Unknown1706(OutBuffer<BufferAttr_HipcAutoSelect> out_buffer_58,
+                       InBuffer<BufferAttr_HipcMapAlias> in_buffer_8);
 
 private:
     KernelHelpers::ServiceContext service_context;
diff --git a/src/core/hle/service/ns/ns_types.h b/src/core/hle/service/ns/ns_types.h
index 2dd664c4e9..a4eec3a5d8 100644
--- a/src/core/hle/service/ns/ns_types.h
+++ b/src/core/hle/service/ns/ns_types.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -81,10 +84,11 @@ static_assert(sizeof(PromotionInfo) == 0x20, "PromotionInfo has incorrect size."
 
 /// NsApplicationViewWithPromotionInfo
 struct ApplicationViewWithPromotionInfo {
-    ApplicationView view;    ///< \ref NsApplicationView
-    PromotionInfo promotion; ///< \ref NsPromotionInfo
+    ApplicationView view;           ///< \ref NsApplicationView
+    PromotionInfo promotion;        ///< \ref NsPromotionInfo
+    std::array<u8, 0x8> padding{};  ///< Extra padding for newer HOS versions
 };
-static_assert(sizeof(ApplicationViewWithPromotionInfo) == 0x70,
+static_assert(sizeof(ApplicationViewWithPromotionInfo) == 0x78,
               "ApplicationViewWithPromotionInfo has incorrect size.");
 
 struct ApplicationOccupiedSizeEntity {
@@ -113,4 +117,10 @@ struct Uid {
 };
 static_assert(sizeof(Uid) == 0x10, "Uid has incorrect size.");
 
+struct ApplicationDisplayData {
+    std::array<char, 0x200> application_name;
+    std::array<char, 0x100> developer_name;
+};
+static_assert(sizeof(ApplicationDisplayData) == 0x300, "ApplicationDisplayData has incorrect size.");
+
 } // namespace Service::NS
diff --git a/src/core/hle/service/ns/read_only_application_control_data_interface.cpp b/src/core/hle/service/ns/read_only_application_control_data_interface.cpp
index 9b2ca94a4f..c72aa08870 100644
--- a/src/core/hle/service/ns/read_only_application_control_data_interface.cpp
+++ b/src/core/hle/service/ns/read_only_application_control_data_interface.cpp
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -7,6 +10,7 @@
 #include "core/file_sys/vfs/vfs.h"
 #include "core/hle/service/cmif_serialization.h"
 #include "core/hle/service/ns/language.h"
+#include "core/hle/service/ns/ns_types.h"
 #include "core/hle/service/ns/ns_results.h"
 #include "core/hle/service/ns/read_only_application_control_data_interface.h"
 #include "core/hle/service/set/settings_server.h"
@@ -23,6 +27,7 @@ IReadOnlyApplicationControlDataInterface::IReadOnlyApplicationControlDataInterfa
         {2, D<&IReadOnlyApplicationControlDataInterface::ConvertApplicationLanguageToLanguageCode>, "ConvertApplicationLanguageToLanguageCode"},
         {3, nullptr, "ConvertLanguageCodeToApplicationLanguage"},
         {4, nullptr, "SelectApplicationDesiredLanguage"},
+        {5, D<&IReadOnlyApplicationControlDataInterface::GetApplicationDisplayData>, "GetApplicationDisplayData"},
     };
     // clang-format on
 
@@ -119,4 +124,33 @@ Result IReadOnlyApplicationControlDataInterface::ConvertApplicationLanguageToLan
     R_SUCCEED();
 }
 
+Result IReadOnlyApplicationControlDataInterface::GetApplicationDisplayData(
+    OutBuffer<BufferAttr_HipcMapAlias> out_buffer, Out<u64> out_size, u64 language_code,
+    u64 application_id) {
+    LOG_INFO(Service_NS, "called with application_id={:016X}, language_code={:016X}",
+             application_id, language_code);
+
+    constexpr u64 payload_size = sizeof(ApplicationDisplayData);
+
+    if (out_buffer.size() < payload_size) {
+        LOG_ERROR(Service_NS, "output buffer is too small! (actual={}, expected_min={})",
+                  out_buffer.size(), payload_size);
+        R_THROW(ResultUnknown);
+    }
+
+    const FileSys::PatchManager pm{application_id, system.GetFileSystemController(),
+                                   system.GetContentProvider()};
+    const auto control = pm.GetControlMetadata();
+
+    ApplicationDisplayData display_data{};
+
+    std::memset(display_data.application_name.data(), 0, display_data.application_name.size());
+    std::memset(display_data.developer_name.data(), 0, display_data.developer_name.size());
+
+    std::memcpy(out_buffer.data(), &display_data, payload_size);
+    *out_size = payload_size;
+
+    R_SUCCEED();
+}
+
 } // namespace Service::NS
diff --git a/src/core/hle/service/ns/read_only_application_control_data_interface.h b/src/core/hle/service/ns/read_only_application_control_data_interface.h
index ac099435ab..9ac355014d 100644
--- a/src/core/hle/service/ns/read_only_application_control_data_interface.h
+++ b/src/core/hle/service/ns/read_only_application_control_data_interface.h
@@ -1,12 +1,15 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
 #include "core/hle/service/cmif_types.h"
+#include "core/hle/service/service.h"
 #include "core/hle/service/ns/language.h"
 #include "core/hle/service/ns/ns_types.h"
-#include "core/hle/service/service.h"
 
 namespace Service::NS {
 
@@ -16,7 +19,6 @@ public:
     explicit IReadOnlyApplicationControlDataInterface(Core::System& system_);
     ~IReadOnlyApplicationControlDataInterface() override;
 
-public:
     Result GetApplicationControlData(OutBuffer<BufferAttr_HipcMapAlias> out_buffer,
                                      Out<u32> out_actual_size,
                                      ApplicationControlSource application_control_source,
@@ -25,6 +27,10 @@ public:
                                          u32 supported_languages);
     Result ConvertApplicationLanguageToLanguageCode(Out<u64> out_language_code,
                                                     ApplicationLanguage application_language);
+
+    Result GetApplicationDisplayData(OutBuffer<BufferAttr_HipcMapAlias> out_buffer,
+                                     Out<u64> out_size, u64 language_code,
+                                     u64 application_id);
 };
 
 } // namespace Service::NS
diff --git a/src/core/hle/service/ns/read_only_application_record_interface.cpp b/src/core/hle/service/ns/read_only_application_record_interface.cpp
index 816a1e1dc8..18f9e41d8c 100644
--- a/src/core/hle/service/ns/read_only_application_record_interface.cpp
+++ b/src/core/hle/service/ns/read_only_application_record_interface.cpp
@@ -1,8 +1,13 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "core/hle/service/cmif_serialization.h"
 #include "core/hle/service/ns/read_only_application_record_interface.h"
+#include "core/hle/service/ns/ns_types.h"
+#include "core/hle/service/ns/application_manager_interface.h"
 
 namespace Service::NS {
 
@@ -13,6 +18,8 @@ IReadOnlyApplicationRecordInterface::IReadOnlyApplicationRecordInterface(Core::S
         {1, nullptr, "NotifyApplicationFailure"},
         {2, D<&IReadOnlyApplicationRecordInterface::IsDataCorruptedResult>,
          "IsDataCorruptedResult"},
+        {3, D<&IReadOnlyApplicationRecordInterface::ListApplicationRecord>,
+         "ListApplicationRecord"},
     };
     // clang-format on
 
@@ -35,4 +42,14 @@ Result IReadOnlyApplicationRecordInterface::IsDataCorruptedResult(
     R_SUCCEED();
 }
 
+Result IReadOnlyApplicationRecordInterface::ListApplicationRecord(
+    OutArray<ApplicationRecord, BufferAttr_HipcMapAlias> out_records, Out<s32> out_count,
+    s32 entry_offset) {
+    LOG_DEBUG(Service_NS, "delegating to IApplicationManagerInterface::ListApplicationRecord, offset={} limit={}",
+              entry_offset, out_records.size());
+
+    R_RETURN(IApplicationManagerInterface(system).ListApplicationRecord(out_records, out_count,
+                                                                        entry_offset));
+}
+
 } // namespace Service::NS
diff --git a/src/core/hle/service/ns/read_only_application_record_interface.h b/src/core/hle/service/ns/read_only_application_record_interface.h
index d06e8f5e66..fc43c768ba 100644
--- a/src/core/hle/service/ns/read_only_application_record_interface.h
+++ b/src/core/hle/service/ns/read_only_application_record_interface.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -5,6 +8,7 @@
 
 #include "core/hle/service/cmif_types.h"
 #include "core/hle/service/service.h"
+#include "core/hle/service/ns/ns_types.h"
 
 namespace Service::NS {
 
@@ -17,6 +21,9 @@ public:
 private:
     Result HasApplicationRecord(Out<bool> out_has_application_record, u64 program_id);
     Result IsDataCorruptedResult(Out<bool> out_is_data_corrupted_result, Result result);
+    Result ListApplicationRecord(
+        OutArray<ApplicationRecord, BufferAttr_HipcMapAlias> out_records, Out<s32> out_count,
+        s32 entry_offset);
 };
 
 } // namespace Service::NS
diff --git a/src/core/hle/service/pctl/parental_control_service.cpp b/src/core/hle/service/pctl/parental_control_service.cpp
index 82c65ac1fd..1310be64b1 100644
--- a/src/core/hle/service/pctl/parental_control_service.cpp
+++ b/src/core/hle/service/pctl/parental_control_service.cpp
@@ -38,6 +38,7 @@ IParentalControlService::IParentalControlService(Core::System& system_, Capabili
         {1016, nullptr, "ConfirmShowNewsPermission"},
         {1017, D<&IParentalControlService::EndFreeCommunication>, "EndFreeCommunication"},
         {1018, D<&IParentalControlService::IsFreeCommunicationAvailable>, "IsFreeCommunicationAvailable"},
+        {1019, D<&IParentalControlService::ConfirmLaunchApplicationPermission>, "ConfirmLaunchApplicationPermission"},
         {1031, D<&IParentalControlService::IsRestrictionEnabled>, "IsRestrictionEnabled"},
         {1032, D<&IParentalControlService::GetSafetyLevel>, "GetSafetyLevel"},
         {1033, nullptr, "SetSafetyLevel"},
diff --git a/src/hid_core/resources/npad/npad_types.h b/src/hid_core/resources/npad/npad_types.h
index 92700d69a6..68b803c3d3 100644
--- a/src/hid_core/resources/npad/npad_types.h
+++ b/src/hid_core/resources/npad/npad_types.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -159,6 +162,17 @@ struct NpadGcTriggerState {
 };
 static_assert(sizeof(NpadGcTriggerState) == 0x10, "NpadGcTriggerState is an invalid size");
 
+// This is nn::hid::NpadCondition (global controller condition structure)
+struct NpadCondition {
+    u32 _00{};
+    u32 is_initialized{1};
+    u32 hold_type{static_cast<u32>(NpadJoyHoldType::Horizontal)};
+    u32 is_valid{1};
+};
+static_assert(sizeof(NpadCondition) == 0x10, "NpadCondition is an invalid size");
+
+
+
 // This is nn::hid::NpadSystemProperties
 struct NPadSystemProperties {
     union {
diff --git a/src/hid_core/resources/ring_lifo.h b/src/hid_core/resources/ring_lifo.h
index 0816784e08..55ba2f0e61 100644
--- a/src/hid_core/resources/ring_lifo.h
+++ b/src/hid_core/resources/ring_lifo.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -44,8 +47,7 @@ struct Lifo {
             buffer_count++;
         }
         buffer_tail = GetNextEntryIndex();
-        const auto& previous_entry = ReadPreviousEntry();
-        entries[buffer_tail].sampling_number = previous_entry.sampling_number + 1;
+        entries[buffer_tail].sampling_number = new_state.sampling_number << 1;
         entries[buffer_tail].state = new_state;
     }
 };
diff --git a/src/hid_core/resources/shared_memory_format.h b/src/hid_core/resources/shared_memory_format.h
index 49755c8dc3..b9deeec302 100644
--- a/src/hid_core/resources/shared_memory_format.h
+++ b/src/hid_core/resources/shared_memory_format.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -201,7 +204,9 @@ static_assert(sizeof(ConsoleSixAxisSensorSharedMemoryFormat) == 0x20,
 
 // This is nn::hid::detail::SharedMemoryFormat
 struct SharedMemoryFormat {
-    void Initialize() {}
+    void Initialize() {
+        npad_condition = NpadCondition{};
+    }
 
     DebugPadSharedMemoryFormat debug_pad;
     TouchScreenSharedMemoryFormat touch_screen;
@@ -218,7 +223,9 @@ struct SharedMemoryFormat {
     ConsoleSixAxisSensorSharedMemoryFormat console;
     INSERT_PADDING_BYTES(0x19E0);
     MouseSharedMemoryFormat debug_mouse;
-    INSERT_PADDING_BYTES(0x2000);
+    INSERT_PADDING_BYTES(0x200);
+    NpadCondition npad_condition;
+    INSERT_PADDING_BYTES(0x1DF0);
 };
 static_assert(offsetof(SharedMemoryFormat, debug_pad) == 0x0, "debug_pad has wrong offset");
 static_assert(offsetof(SharedMemoryFormat, touch_screen) == 0x400, "touch_screen has wrong offset");
@@ -236,6 +243,8 @@ static_assert(offsetof(SharedMemoryFormat, npad) == 0x9A00, "npad has wrong offs
 static_assert(offsetof(SharedMemoryFormat, gesture) == 0x3BA00, "gesture has wrong offset");
 static_assert(offsetof(SharedMemoryFormat, console) == 0x3C200, "console has wrong offset");
 static_assert(offsetof(SharedMemoryFormat, debug_mouse) == 0x3DC00, "debug_mouse has wrong offset");
+static_assert(offsetof(SharedMemoryFormat, npad_condition) == 0x3E200,
+              "npad_condition has wrong offset");
 static_assert(sizeof(SharedMemoryFormat) == 0x40000, "SharedMemoryFormat is an invalid size");
 
 } // namespace Service::HID