samplewriter.js

// Signature: void write_samples(float *buf, size_t buf_len)
var write_samples = Module.cwrap('write_samples', null, ['number', 'number']);
var buf_len = 0;
var buf_addr;
var buf;
 node.onaudioprocess = function(e) {
        var out_data = e.outputBuffer.getChannelData(0);
        
        if(buf_len < out_data.length) {
            buf_len = out_data.length;
            buf_addr = realloc(buf_addr, buf_len * 4);
            buf = new Uint8Array(Module.HEAPU8.buffer, buf_addr, buf_len * 4);
        }

        write_samples(buf.byteOffset, out_data.length);
        var result = new Float32Array(buf.buffer, buf.byteOffset, out_data.length);
        out_data.set(result);
    }