80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
#ifndef SOFTFM_RTLSDRSOURCE_H
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#define SOFTFM_RTLSDRSOURCE_H
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#include <cstdint>
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#include <string>
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#include <vector>
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#include "SoftFM.h"
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class RtlSdrSource
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{
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public:
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static const int default_block_length = 65536;
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/** Open RTL-SDR device. */
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RtlSdrSource(int dev_index);
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/** Close RTL-SDR device. */
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~RtlSdrSource();
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/**
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* Configure RTL-SDR tuner and prepare for streaming.
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*
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* sample_rate :: desired sample rate in Hz.
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* frequency :: desired center frequency in Hz.
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* gain :: desired tuner gain index, or -1 for auto-gain.
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* block_length :: preferred number of samples per block.
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*
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* Return true for success, false if an error occurred.
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*/
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bool configure(uint32_t sample_rate, uint32_t frequency, int tuner_gain,
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int block_length=default_block_length);
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/** Return current sample frequency in Hz. */
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uint32_t get_sample_rate();
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/** Return current center frequency in Hz. */
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uint32_t get_frequency();
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/** Return current tuner gain in dB. */
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double get_tuner_gain();
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/** Return a list of supported tuner gain settings in dB. */
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std::vector<double> get_tuner_gains();
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/**
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* Fetch a bunch of samples from the device.
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*
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* This function must be called regularly to maintain streaming.
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* Return true for success, false if an error occurred.
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*/
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bool get_samples(IQSampleVector& samples);
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/** Return the last error, or return an empty string if there is no error. */
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std::string error()
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{
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std::string ret(m_error);
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m_error.clear();
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return ret;
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}
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/** Return true if the device is OK, return false if there is an error. */
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operator bool() const
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{
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return m_dev && m_error.empty();
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}
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/** Return a list of supported devices. */
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static std::vector<std::string> get_device_names();
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private:
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struct rtlsdr_dev * m_dev;
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int m_block_length;
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std::string m_error;
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};
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#endif
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