Rework to add and use a binding for radio control

A radio binding has been added in the new binding directory, and the
application has been reworked to use it.  The binding uses a modified
version of the rtl_fm code used in the qtmultimedia radio plugin that
was previously used, and some new code has been added to output to
PulseAudio using the asynchronous API to ensure compatibility with
stream corking.  The rtl_fm code has been enhanced to add seeking
support, and the application has been tweaked to use it.

Bug-AGL: SPEC-581

Change-Id: I011e98374accc2cad2b36c93ac800948ee51f2aa
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

2 files changed, 446 insertions, 0 deletions

diff --git a/convenience/convenience.c b/convenience/convenience.c
new file mode 100644
index 0000000..517dc4e
--- /dev/null
+++ b/convenience/convenience.c
@@ -0,0 +1,304 @@
+/*
+ * Copyright (C) 2014 by Kyle Keen <keenerd@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* a collection of user friendly tools
+ * todo: use strtol for more flexible int parsing
+ * */
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef _WIN32
+#include <unistd.h>
+#else
+#include <windows.h>
+#include <fcntl.h>
+#include <io.h>
+#define _USE_MATH_DEFINES
+#endif
+
+#include <math.h>
+
+#include "rtl-sdr.h"
+
+double atofs(char *s)
+/* standard suffixes */
+{
+	char last;
+	int len;
+	double suff = 1.0;
+	len = strlen(s);
+	last = s[len-1];
+	s[len-1] = '\0';
+	switch (last) {
+		case 'g':
+		case 'G':
+			suff *= 1e3;
+		case 'm':
+		case 'M':
+			suff *= 1e3;
+		case 'k':
+		case 'K':
+			suff *= 1e3;
+			suff *= atof(s);
+			s[len-1] = last;
+			return suff;
+	}
+	s[len-1] = last;
+	return atof(s);
+}
+
+double atoft(char *s)
+/* time suffixes, returns seconds */
+{
+	char last;
+	int len;
+	double suff = 1.0;
+	len = strlen(s);
+	last = s[len-1];
+	s[len-1] = '\0';
+	switch (last) {
+		case 'h':
+		case 'H':
+			suff *= 60;
+		case 'm':
+		case 'M':
+			suff *= 60;
+		case 's':
+		case 'S':
+			suff *= atof(s);
+			s[len-1] = last;
+			return suff;
+	}
+	s[len-1] = last;
+	return atof(s);
+}
+
+double atofp(char *s)
+/* percent suffixes */
+{
+	char last;
+	int len;
+	double suff = 1.0;
+	len = strlen(s);
+	last = s[len-1];
+	s[len-1] = '\0';
+	switch (last) {
+		case '%':
+			suff *= 0.01;
+			suff *= atof(s);
+			s[len-1] = last;
+			return suff;
+	}
+	s[len-1] = last;
+	return atof(s);
+}
+
+int nearest_gain(rtlsdr_dev_t *dev, int target_gain)
+{
+	int i, r, err1, err2, count, nearest;
+	int* gains;
+	r = rtlsdr_set_tuner_gain_mode(dev, 1);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
+		return r;
+	}
+	count = rtlsdr_get_tuner_gains(dev, NULL);
+	if (count <= 0) {
+		return 0;
+	}
+	gains = malloc(sizeof(int) * count);
+	count = rtlsdr_get_tuner_gains(dev, gains);
+	nearest = gains[0];
+	for (i=0; i<count; i++) {
+		err1 = abs(target_gain - nearest);
+		err2 = abs(target_gain - gains[i]);
+		if (err2 < err1) {
+			nearest = gains[i];
+		}
+	}
+	free(gains);
+	return nearest;
+}
+
+int verbose_set_frequency(rtlsdr_dev_t *dev, uint32_t frequency)
+{
+	int r;
+	r = rtlsdr_set_center_freq(dev, frequency);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to set center freq.\n");
+	} else {
+		fprintf(stderr, "Tuned to %u Hz.\n", frequency);
+	}
+	return r;
+}
+
+int verbose_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate)
+{
+	int r;
+	r = rtlsdr_set_sample_rate(dev, samp_rate);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to set sample rate.\n");
+	} else {
+		fprintf(stderr, "Sampling at %u S/s.\n", samp_rate);
+	}
+	return r;
+}
+
+int verbose_direct_sampling(rtlsdr_dev_t *dev, int on)
+{
+	int r;
+	r = rtlsdr_set_direct_sampling(dev, on);
+	if (r != 0) {
+		fprintf(stderr, "WARNING: Failed to set direct sampling mode.\n");
+		return r;
+	}
+	if (on == 0) {
+		fprintf(stderr, "Direct sampling mode disabled.\n");}
+	if (on == 1) {
+		fprintf(stderr, "Enabled direct sampling mode, input 1/I.\n");}
+	if (on == 2) {
+		fprintf(stderr, "Enabled direct sampling mode, input 2/Q.\n");}
+	return r;
+}
+
+int verbose_offset_tuning(rtlsdr_dev_t *dev)
+{
+	int r;
+	r = rtlsdr_set_offset_tuning(dev, 1);
+	if (r != 0) {
+		fprintf(stderr, "WARNING: Failed to set offset tuning.\n");
+	} else {
+		fprintf(stderr, "Offset tuning mode enabled.\n");
+	}
+	return r;
+}
+
+int verbose_auto_gain(rtlsdr_dev_t *dev)
+{
+	int r;
+	r = rtlsdr_set_tuner_gain_mode(dev, 0);
+	if (r != 0) {
+		fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
+	} else {
+		fprintf(stderr, "Tuner gain set to automatic.\n");
+	}
+	return r;
+}
+
+int verbose_gain_set(rtlsdr_dev_t *dev, int gain)
+{
+	int r;
+	r = rtlsdr_set_tuner_gain_mode(dev, 1);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
+		return r;
+	}
+	r = rtlsdr_set_tuner_gain(dev, gain);
+	if (r != 0) {
+		fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
+	} else {
+		fprintf(stderr, "Tuner gain set to %0.2f dB.\n", gain/10.0);
+	}
+	return r;
+}
+
+int verbose_ppm_set(rtlsdr_dev_t *dev, int ppm_error)
+{
+	int r;
+	if (ppm_error == 0) {
+		return 0;}
+	r = rtlsdr_set_freq_correction(dev, ppm_error);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to set ppm error.\n");
+	} else {
+		fprintf(stderr, "Tuner error set to %i ppm.\n", ppm_error);
+	}
+	return r;
+}
+
+int verbose_reset_buffer(rtlsdr_dev_t *dev)
+{
+	int r;
+	r = rtlsdr_reset_buffer(dev);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to reset buffers.\n");}
+	return r;
+}
+
+int verbose_device_search(char *s)
+{
+	int i, device_count, device, offset;
+	char *s2;
+	char vendor[256], product[256], serial[256];
+	device_count = rtlsdr_get_device_count();
+	if (!device_count) {
+		fprintf(stderr, "No supported devices found.\n");
+		return -1;
+	}
+	fprintf(stderr, "Found %d device(s):\n", device_count);
+	for (i = 0; i < device_count; i++) {
+		rtlsdr_get_device_usb_strings(i, vendor, product, serial);
+		fprintf(stderr, "  %d:  %s, %s, SN: %s\n", i, vendor, product, serial);
+	}
+	fprintf(stderr, "\n");
+	/* does string look like raw id number */
+	device = (int)strtol(s, &s2, 0);
+	if (s2[0] == '\0' && device >= 0 && device < device_count) {
+		fprintf(stderr, "Using device %d: %s\n",
+			device, rtlsdr_get_device_name((uint32_t)device));
+		return device;
+	}
+	/* does string exact match a serial */
+	for (i = 0; i < device_count; i++) {
+		rtlsdr_get_device_usb_strings(i, vendor, product, serial);
+		if (strcmp(s, serial) != 0) {
+			continue;}
+		device = i;
+		fprintf(stderr, "Using device %d: %s\n",
+			device, rtlsdr_get_device_name((uint32_t)device));
+		return device;
+	}
+	/* does string prefix match a serial */
+	for (i = 0; i < device_count; i++) {
+		rtlsdr_get_device_usb_strings(i, vendor, product, serial);
+		if (strncmp(s, serial, strlen(s)) != 0) {
+			continue;}
+		device = i;
+		fprintf(stderr, "Using device %d: %s\n",
+			device, rtlsdr_get_device_name((uint32_t)device));
+		return device;
+	}
+	/* does string suffix match a serial */
+	for (i = 0; i < device_count; i++) {
+		rtlsdr_get_device_usb_strings(i, vendor, product, serial);
+		offset = strlen(serial) - strlen(s);
+		if (offset < 0) {
+			continue;}
+		if (strncmp(s, serial+offset, strlen(s)) != 0) {
+			continue;}
+		device = i;
+		fprintf(stderr, "Using device %d: %s\n",
+			device, rtlsdr_get_device_name((uint32_t)device));
+		return device;
+	}
+	fprintf(stderr, "No matching devices found.\n");
+	return -1;
+}
+
+// vim: tabstop=8:softtabstop=8:shiftwidth=8:noexpandtab
diff --git a/convenience/convenience.h b/convenience/convenience.h
new file mode 100644
index 0000000..1faa2af
--- /dev/null
+++ b/convenience/convenience.h
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2014 by Kyle Keen <keenerd@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* a collection of user friendly tools */
+
+/*!
+ * Convert standard suffixes (k, M, G) to double
+ *
+ * \param s a string to be parsed
+ * \return double
+ */
+
+double atofs(char *s);
+
+/*!
+ * Convert time suffixes (s, m, h) to double
+ *
+ * \param s a string to be parsed
+ * \return seconds as double
+ */
+
+double atoft(char *s);
+
+/*!
+ * Convert percent suffixe (%) to double
+ *
+ * \param s a string to be parsed
+ * \return double
+ */
+
+double atofp(char *s);
+
+/*!
+ * Find nearest supported gain
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param target_gain in tenths of a dB
+ * \return 0 on success
+ */
+
+int nearest_gain(rtlsdr_dev_t *dev, int target_gain);
+
+/*!
+ * Set device frequency and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param frequency in Hz
+ * \return 0 on success
+ */
+
+int verbose_set_frequency(rtlsdr_dev_t *dev, uint32_t frequency);
+
+/*!
+ * Set device sample rate and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param samp_rate in samples/second
+ * \return 0 on success
+ */
+
+int verbose_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate);
+
+/*!
+ * Enable or disable the direct sampling mode and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param on 0 means disabled, 1 I-ADC input enabled, 2 Q-ADC input enabled
+ * \return 0 on success
+ */
+
+int verbose_direct_sampling(rtlsdr_dev_t *dev, int on);
+
+/*!
+ * Enable offset tuning and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \return 0 on success
+ */
+
+int verbose_offset_tuning(rtlsdr_dev_t *dev);
+
+/*!
+ * Enable auto gain and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \return 0 on success
+ */
+
+int verbose_auto_gain(rtlsdr_dev_t *dev);
+
+/*!
+ * Set tuner gain and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param gain in tenths of a dB
+ * \return 0 on success
+ */
+
+int verbose_gain_set(rtlsdr_dev_t *dev, int gain);
+
+/*!
+ * Set the frequency correction value for the device and report status on stderr.
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param ppm_error correction value in parts per million (ppm)
+ * \return 0 on success
+ */
+
+int verbose_ppm_set(rtlsdr_dev_t *dev, int ppm_error);
+
+/*!
+ * Reset buffer
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \return 0 on success
+ */
+
+int verbose_reset_buffer(rtlsdr_dev_t *dev);
+
+/*!
+ * Find the closest matching device.
+ *
+ * \param s a string to be parsed
+ * \return dev_index int, -1 on error
+ */
+
+int verbose_device_search(char *s);
+