From 6dabe6768a0c35dc6e544d6db190c9c53ef41eaa Mon Sep 17 00:00:00 2001
From: Jan Svabenik <jan@svabi.ch>
Date: Thu, 19 Mar 2026 08:39:32 +0100
Subject: [PATCH] feat: add demod validation and GPU mode telemetry

---
 internal/demod/gpudemod/build/kernels.obj     | Bin 68626 -> 81894 bytes
 internal/demod/gpudemod/gpudemod.go           |  47 ++++++++++++++++
 internal/demod/gpudemod/gpudemod_stub.go      |   1 +
 internal/demod/gpudemod/kernels.cu            |  53 ++++++++++++++++++
 internal/demod/gpudemod/validation_extra.go   |  42 ++++++++++++++
 .../demod/gpudemod/validation_extra_test.go   |  22 ++++++++
 internal/recorder/demod.go                    |   3 +
 7 files changed, 168 insertions(+)
 create mode 100644 internal/demod/gpudemod/validation_extra.go
 create mode 100644 internal/demod/gpudemod/validation_extra_test.go

diff --git a/internal/demod/gpudemod/build/kernels.obj b/internal/demod/gpudemod/build/kernels.obj
index 808846a4be1faaafad92091d5fa740c9cc5dcafd..22daf7a2f23fc935da5716db02e05cdd48dac60f 100644
GIT binary patch
delta 18728
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diff --git a/internal/demod/gpudemod/gpudemod.go b/internal/demod/gpudemod/gpudemod.go
index cb0b084..6703784 100644
--- a/internal/demod/gpudemod/gpudemod.go
+++ b/internal/demod/gpudemod/gpudemod.go
@@ -190,6 +190,52 @@ func (e *Engine) tryCUDAFMDiscrim(shifted []complex64) ([]float32, bool) {
 	return out, true
 }
 
+func (e *Engine) tryCUDAAMEnvelope(shifted []complex64) ([]float32, bool) {
+	if e == nil || !e.cudaReady || len(shifted) == 0 || e.dShifted == nil || e.dAudio == nil {
+		return nil, false
+	}
+	iqBytes := C.size_t(len(shifted)) * C.size_t(unsafe.Sizeof(complex64(0)))
+	if C.gpud_memcpy_h2d(unsafe.Pointer(e.dShifted), unsafe.Pointer(&shifted[0]), iqBytes) != C.cudaSuccess {
+		return nil, false
+	}
+	if C.gpud_launch_am_envelope(e.dShifted, e.dAudio, C.int(len(shifted))) != 0 {
+		return nil, false
+	}
+	if C.gpud_device_sync() != C.cudaSuccess {
+		return nil, false
+	}
+	out := make([]float32, len(shifted))
+	outBytes := C.size_t(len(out)) * C.size_t(unsafe.Sizeof(float32(0)))
+	if C.gpud_memcpy_d2h(unsafe.Pointer(&out[0]), unsafe.Pointer(e.dAudio), outBytes) != C.cudaSuccess {
+		return nil, false
+	}
+	return out, true
+}
+
+func (e *Engine) tryCUDASSBProduct(shifted []complex64, bfoHz float64) ([]float32, bool) {
+	if e == nil || !e.cudaReady || len(shifted) == 0 || e.dShifted == nil || e.dAudio == nil {
+		return nil, false
+	}
+	iqBytes := C.size_t(len(shifted)) * C.size_t(unsafe.Sizeof(complex64(0)))
+	if C.gpud_memcpy_h2d(unsafe.Pointer(e.dShifted), unsafe.Pointer(&shifted[0]), iqBytes) != C.cudaSuccess {
+		return nil, false
+	}
+	phaseInc := 2.0 * math.Pi * bfoHz / float64(e.sampleRate)
+	if C.gpud_launch_ssb_product(e.dShifted, e.dAudio, C.int(len(shifted)), C.double(phaseInc), C.double(e.bfoPhase)) != 0 {
+		return nil, false
+	}
+	if C.gpud_device_sync() != C.cudaSuccess {
+		return nil, false
+	}
+	out := make([]float32, len(shifted))
+	outBytes := C.size_t(len(out)) * C.size_t(unsafe.Sizeof(float32(0)))
+	if C.gpud_memcpy_d2h(unsafe.Pointer(&out[0]), unsafe.Pointer(e.dAudio), outBytes) != C.cudaSuccess {
+		return nil, false
+	}
+	e.bfoPhase += phaseInc * float64(len(shifted))
+	return out, true
+}
+
 func (e *Engine) Demod(iq []complex64, offsetHz float64, bw float64, mode DemodType) ([]float32, int, error) {
 	if e == nil {
 		return nil, 0, errors.New("nil CUDA demod engine")
@@ -240,6 +286,7 @@ func (e *Engine) Demod(iq []complex64, offsetHz float64, bw float64, mode DemodT
 		decim = 1
 	}
 	dec := dsp.Decimate(filtered, decim)
+	e.lastDecimUsedGPU = false
 	inputRate := e.sampleRate / decim
 
 	switch mode {
diff --git a/internal/demod/gpudemod/gpudemod_stub.go b/internal/demod/gpudemod/gpudemod_stub.go
index 86ca9b1..b201f1a 100644
--- a/internal/demod/gpudemod/gpudemod_stub.go
+++ b/internal/demod/gpudemod/gpudemod_stub.go
@@ -30,6 +30,7 @@ func New(maxSamples int, sampleRate int) (*Engine, error) {
 func (e *Engine) SetFIR(taps []float32) {}
 
 func (e *Engine) LastShiftUsedGPU() bool { return false }
+func (e *Engine) LastDemodUsedGPU() bool { return false }
 
 func (e *Engine) Demod(iq []complex64, offsetHz float64, bw float64, mode DemodType) ([]float32, int, error) {
 	return nil, 0, errors.New("CUDA demod not available: cufft build tag not enabled")
diff --git a/internal/demod/gpudemod/kernels.cu b/internal/demod/gpudemod/kernels.cu
index d29ed54..f308b8d 100644
--- a/internal/demod/gpudemod/kernels.cu
+++ b/internal/demod/gpudemod/kernels.cu
@@ -127,3 +127,56 @@ extern "C" int gpud_launch_decimate_cuda(
     gpud_decimate_kernel<<<grid, block>>>(in, out, n_out, factor);
     return (int)cudaGetLastError();
 }
+
+extern "C" __global__ void gpud_am_envelope_kernel(
+    const float2* __restrict__ in,
+    float* __restrict__ out,
+    int n
+) {
+    int idx = blockIdx.x * blockDim.x + threadIdx.x;
+    if (idx >= n) return;
+    float2 v = in[idx];
+    out[idx] = sqrtf(v.x * v.x + v.y * v.y);
+}
+
+extern "C" int gpud_launch_am_envelope_cuda(
+    const float2* in,
+    float* out,
+    int n
+) {
+    if (n <= 0) return 0;
+    const int block = 256;
+    const int grid = (n + block - 1) / block;
+    gpud_am_envelope_kernel<<<grid, block>>>(in, out, n);
+    return (int)cudaGetLastError();
+}
+
+extern "C" __global__ void gpud_ssb_product_kernel(
+    const float2* __restrict__ in,
+    float* __restrict__ out,
+    int n,
+    double phase_inc,
+    double phase_start
+) {
+    int idx = blockIdx.x * blockDim.x + threadIdx.x;
+    if (idx >= n) return;
+    double phase = phase_start + phase_inc * (double)idx;
+    float si, co;
+    sincosf((float)phase, &si, &co);
+    float2 v = in[idx];
+    out[idx] = v.x * co - v.y * si;
+}
+
+extern "C" int gpud_launch_ssb_product_cuda(
+    const float2* in,
+    float* out,
+    int n,
+    double phase_inc,
+    double phase_start
+) {
+    if (n <= 0) return 0;
+    const int block = 256;
+    const int grid = (n + block - 1) / block;
+    gpud_ssb_product_kernel<<<grid, block>>>(in, out, n, phase_inc, phase_start);
+    return (int)cudaGetLastError();
+}
diff --git a/internal/demod/gpudemod/validation_extra.go b/internal/demod/gpudemod/validation_extra.go
new file mode 100644
index 0000000..5c164f8
--- /dev/null
+++ b/internal/demod/gpudemod/validation_extra.go
@@ -0,0 +1,42 @@
+//go:build cufft
+
+package gpudemod
+
+import (
+	"math/cmplx"
+
+	"sdr-visual-suite/internal/dsp"
+)
+
+func ValidateFIR(iq []complex64, taps []float32, filtered []complex64, tol float64) bool {
+	if len(iq) != len(filtered) {
+		return false
+	}
+	ftaps := make([]float64, len(taps))
+	for i, v := range taps {
+		ftaps[i] = float64(v)
+	}
+	ref := dsp.ApplyFIR(iq, ftaps)
+	for i := range ref {
+		if cmplx.Abs(complex128(ref[i]-filtered[i])) > tol {
+			return false
+		}
+	}
+	return true
+}
+
+func ValidateDecimate(iq []complex64, factor int, decimated []complex64, tol float64) bool {
+	if factor <= 0 {
+		return false
+	}
+	ref := dsp.Decimate(iq, factor)
+	if len(ref) != len(decimated) {
+		return false
+	}
+	for i := range ref {
+		if cmplx.Abs(complex128(ref[i]-decimated[i])) > tol {
+			return false
+		}
+	}
+	return true
+}
diff --git a/internal/demod/gpudemod/validation_extra_test.go b/internal/demod/gpudemod/validation_extra_test.go
new file mode 100644
index 0000000..e192acd
--- /dev/null
+++ b/internal/demod/gpudemod/validation_extra_test.go
@@ -0,0 +1,22 @@
+//go:build cufft
+
+package gpudemod
+
+import "testing"
+
+func TestValidateDecimateRejectsBadLength(t *testing.T) {
+	iq := []complex64{1 + 0i, 2 + 0i, 3 + 0i, 4 + 0i}
+	out := []complex64{1 + 0i}
+	if ValidateDecimate(iq, 2, out, 1e-6) {
+		t.Fatal("expected decimate validation to fail on bad length")
+	}
+}
+
+func TestValidateFIRRejectsBadLength(t *testing.T) {
+	iq := []complex64{1 + 0i, 2 + 0i}
+	taps := []float32{1}
+	out := []complex64{1 + 0i}
+	if ValidateFIR(iq, taps, out, 1e-6) {
+		t.Fatal("expected FIR validation to fail on bad length")
+	}
+}
diff --git a/internal/recorder/demod.go b/internal/recorder/demod.go
index b3caaa6..c937eb8 100644
--- a/internal/recorder/demod.go
+++ b/internal/recorder/demod.go
@@ -54,6 +54,9 @@ func (m *Manager) demodAndWrite(dir string, ev detector.Event, iq []complex64, f
 				if m.gpuDemod.LastShiftUsedGPU() {
 					log.Printf("gpudemod: validated GPU freq-shift used for event %d (%s)", ev.ID, name)
 				}
+				if m.gpuDemod.LastDemodUsedGPU() {
+					log.Printf("gpudemod: GPU demod stage used for event %d (%s)", ev.ID, name)
+				}
 			}
 		}
 	}