wasm support

src/audio/WavReader.h

@@ -0,0 +1,41 @@
+#pragma once
+// Minimal WAV file reader — no external dependencies.
+// Used for WASM builds where libsndfile is unavailable.
+
+#include <cstddef>
+#include <cstdint>
+#include <fstream>
+#include <string>
+#include <vector>
+
+namespace baudline {
+
+class WavReader {
+public:
+    bool open(const std::string& path);
+    void close();
+
+    // Read interleaved float frames.  Returns number of frames read.
+    size_t readFloat(float* buffer, size_t frames);
+
+    // Seek to frame position.
+    void seekFrame(size_t frame);
+
+    int    sampleRate() const { return sampleRate_; }
+    int    channels()   const { return channels_; }
+    size_t totalFrames() const { return totalFrames_; }
+
+private:
+    std::ifstream file_;
+    int      sampleRate_  = 0;
+    int      channels_    = 0;
+    int      bitsPerSample_ = 0;
+    int      bytesPerSample_ = 0;
+    size_t   totalFrames_ = 0;
+    size_t   dataOffset_  = 0;    // byte offset of PCM data in file
+    size_t   dataSize_    = 0;    // total bytes of PCM data
+
+    std::vector<uint8_t> readBuf_;  // scratch for format conversion
+};
+
+} // namespace baudline