forked from retronetworking/osmo-v5
38 lines
810 B
C
38 lines
810 B
C
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enum at_fail {
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AT_FAIL_NONE = 0,
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AT_FAIL_MIN_LEVEL,
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AT_FAIL_MAX_NOISE,
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AT_FAIL_MAX_FREQUENCY,
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};
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enum at_state {
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AT_STATE_NONE = 0,
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AT_STATE_DETECT,
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AT_STATE_TONE,
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AT_STATE_PAUSE,
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};
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struct answer_tone {
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float sine;
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float cosine;
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float coeff;
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float *buffer;
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int buffer_size;
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int buffer_pos;
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float last_phase;
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enum at_state state;
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float tone_duration;
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float frequency_sum;
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int count;
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float last1_valid_phase;
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float last2_valid_phase;
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float last_valid_frequency;
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};
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int answertone_init(struct answer_tone *at, int samplerate);
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void answertone_reset(struct answer_tone *at);
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void answertone_exit(struct answer_tone *at);
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enum at_fail answertone_check(struct answer_tone *at, float *phase_p, float *frequency_p);
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int answertone_process(struct answer_tone *at, int16_t *data, int length);
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