Add Dsp last frame boundary

src/app/emu/audio/dsp.cc

@@ -129,6 +129,10 @@ void Dsp::Reset() {
   sampleOffset = 0;
 }
 
+void Dsp::NewFrame() {
+  lastFrameBoundary = sampleOffset;
+}
+
 void Dsp::Cycle() {
   sampleOutL = 0;
   sampleOutR = 0;
@@ -619,7 +623,7 @@ void Dsp::GetSamples(int16_t* sample_data, int samples_per_frame,
   // resample from 534 / 641 samples per frame to wanted value
   float wantedSamples = (pal_timing ? 641.0 : 534.0);
   double adder = wantedSamples / samples_per_frame;
-  double location = sample_offset_ - wantedSamples;
+  double location = lastFrameBoundary - wantedSamples;
   for (int i = 0; i < samples_per_frame; i++) {
     sample_data[i * 2] = sample_buffer_[(((int)location) & 0x3ff) * 2];
     sample_data[i * 2 + 1] = sample_buffer_[(((int)location) & 0x3ff) * 2 + 1];

src/app/emu/audio/dsp.h

@@ -87,6 +87,8 @@ class Dsp {
  public:
   Dsp(std::vector<uint8_t>& aram) : aram_(aram) {}
 
+  void NewFrame();
+
   void Reset();
 
   void Cycle();
@@ -150,6 +152,7 @@ class Dsp {
   // sample ring buffer (1024 samples, *2 for stereo)
   int16_t sampleBuffer[0x400 * 2];
   uint16_t sampleOffset;  // current offset in samplebuffer
+  uint32_t lastFrameBoundary;
 };
 
 }  // namespace audio