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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <alsa/asoundlib.h>
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#include <alsa/pcm_external.h>
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#include <alsa/pcm_plugin.h>
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#include <math.h>
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void generate_sine(const snd_pcm_channel_area_t *areas,
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snd_pcm_uframes_t offset,
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int count, double *_phase);
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