--- /dev/null
+#ifndef _LINUX_AUDIO_H
+#define _LINUX_AUDIO_H 1
+
+int get_dsp_fd(int sample_rate, int fft_length, int overlap);
+void read_chunk(int fd, short *in, unsigned num_samples);
+void write_sine(int dsp_fd, double freq, unsigned num_samples, unsigned sample_rate);
+
+#endif /* !defined(_LINUX_AUDIO_H) */