Add rtlsdr_set_tuner_bandwidth

Author: Mr-Precise

CMakeLists.txt

@@ -38,7 +38,7 @@ include(CMakePackageConfigHelpers)
 
 # Set the version information here
 set(VERSION_INFO_MAJOR_VERSION 2022) # increment major on api compatibility changes
-set(VERSION_INFO_MINOR_VERSION 6) # increment minor on feature-level changes
+set(VERSION_INFO_MINOR_VERSION 12) # increment minor on feature-level changes
 set(VERSION_INFO_PATCH_VERSION git) # increment patch for bug fixes and docs
 include(Version) # setup version info
 

include/rtl-sdr.h

@@ -215,6 +215,15 @@ RTLSDR_API int rtlsdr_get_tuner_gains(rtlsdr_dev_t *dev, int *gains);
  */
 RTLSDR_API int rtlsdr_set_tuner_gain(rtlsdr_dev_t *dev, int gain);
 
+/*!
+ * Set the bandwidth for the device.
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param bw bandwidth in Hz. Zero means automatic BW selection.
+ * \return 0 on success
+ */
+RTLSDR_API int rtlsdr_set_tuner_bandwidth(rtlsdr_dev_t *dev, uint32_t bw);
+
 /*!
  * Get actual gain the device is configured to.
  *

src/librtlsdr.c

@@ -114,6 +114,7 @@ struct rtlsdr_dev {
 	rtlsdr_tuner_iface_t *tuner;
 	uint32_t tun_xtal; /* Hz */
 	uint32_t freq; /* Hz */
+	uint32_t bw;
 	uint32_t offs_freq; /* Hz */
 	uint32_t effective_freq; /* Hz */
 	int corr; /* ppm */
@@ -1063,6 +1064,24 @@ int rtlsdr_get_tuner_gains(rtlsdr_dev_t *dev, int *gains)
 	}
 }
 
+int rtlsdr_set_tuner_bandwidth(rtlsdr_dev_t *dev, uint32_t bw)
+{
+	int r = 0;
+
+	if (!dev || !dev->tuner)
+		return -1;
+
+	if (dev->tuner->set_bw) {
+		rtlsdr_set_i2c_repeater(dev, 1);
+		r = dev->tuner->set_bw(dev, bw > 0 ? bw : dev->rate);
+		rtlsdr_set_i2c_repeater(dev, 0);
+		if (r)
+			return r;
+		dev->bw = bw;
+	}
+	return r;
+}
+
 int rtlsdr_set_tuner_gain(rtlsdr_dev_t *dev, int gain)
 {
 	int r = 0;