]> sigrok.org Git - libsigrok.git/blobdiff - bindings/cxx/classes.cpp
bindings: Add Output::format()
[libsigrok.git] / bindings / cxx / classes.cpp
index 1b53d0a795968aa79c5a64ed0f9be90b38af3f5b..8316b9bd1944c7a3c37ab77f111f50f6a154fcf3 100644 (file)
@@ -18,8 +18,9 @@
  */
 
 /* Needed for isascii(), as used in the GNU libstdc++ headers */
+/* Needed in strutil.c for POSIX.1-2008 locale functions */
 #ifndef _XOPEN_SOURCE
-#define _XOPEN_SOURCE 600
+#define _XOPEN_SOURCE 700
 #endif
 
 #include <config.h>
@@ -47,9 +48,9 @@ static inline const char *valid_string(const char *input)
 /** Helper function to convert between map<string, VariantBase> and GHashTable */
 static GHashTable *map_to_hash_variant(const map<string, Glib::VariantBase> &input)
 {
-       auto output = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
+       auto *const output = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
                        reinterpret_cast<GDestroyNotify>(&g_variant_unref));
-       for (auto entry : input)
+       for (const auto &entry : input)
                g_hash_table_insert(output,
                        g_strdup(entry.first.c_str()),
                        entry.second.gobj_copy());
@@ -74,7 +75,7 @@ ResourceReader::~ResourceReader()
 }
 
 SR_PRIV int ResourceReader::open_callback(struct sr_resource *res,
-               const char *name, void *cb_data)
+               const char *name, void *cb_data) noexcept
 {
        try {
                auto *const reader = static_cast<ResourceReader*>(cb_data);
@@ -87,7 +88,8 @@ SR_PRIV int ResourceReader::open_callback(struct sr_resource *res,
        return SR_OK;
 }
 
-SR_PRIV int ResourceReader::close_callback(struct sr_resource *res, void *cb_data)
+SR_PRIV int ResourceReader::close_callback(struct sr_resource *res,
+               void *cb_data) noexcept
 {
        try {
                auto *const reader = static_cast<ResourceReader*>(cb_data);
@@ -100,8 +102,8 @@ SR_PRIV int ResourceReader::close_callback(struct sr_resource *res, void *cb_dat
        return SR_OK;
 }
 
-SR_PRIV ssize_t ResourceReader::read_callback(const struct sr_resource *res,
-               void *buf, size_t count, void *cb_data)
+SR_PRIV gssize ResourceReader::read_callback(const struct sr_resource *res,
+               void *buf, size_t count, void *cb_data) noexcept
 {
        try {
                auto *const reader = static_cast<ResourceReader*>(cb_data);
@@ -115,30 +117,32 @@ SR_PRIV ssize_t ResourceReader::read_callback(const struct sr_resource *res,
 
 shared_ptr<Context> Context::create()
 {
-       return shared_ptr<Context>(new Context(), Context::Deleter());
+       return shared_ptr<Context>{new Context{}, default_delete<Context>{}};
 }
 
 Context::Context() :
-       UserOwned(_structure),
+       _structure(nullptr),
        _session(nullptr)
 {
        check(sr_init(&_structure));
 
-       struct sr_dev_driver **driver_list = sr_driver_list(_structure);
-       if (driver_list)
-               for (int i = 0; driver_list[i]; i++)
-                       _drivers[driver_list[i]->name] =
-                               new Driver(driver_list[i]);
-       const struct sr_input_module **input_list = sr_input_list();
-       if (input_list)
-               for (int i = 0; input_list[i]; i++)
-                       _input_formats[sr_input_id_get(input_list[i])] =
-                               new InputFormat(input_list[i]);
-       const struct sr_output_module **output_list = sr_output_list();
-       if (output_list)
-               for (int i = 0; output_list[i]; i++)
-                       _output_formats[sr_output_id_get(output_list[i])] =
-                               new OutputFormat(output_list[i]);
+       if (struct sr_dev_driver **driver_list = sr_driver_list(_structure))
+               for (int i = 0; driver_list[i]; i++) {
+                       unique_ptr<Driver> driver {new Driver{driver_list[i]}};
+                       _drivers.emplace(driver->name(), move(driver));
+               }
+
+       if (const struct sr_input_module **input_list = sr_input_list())
+               for (int i = 0; input_list[i]; i++) {
+                       unique_ptr<InputFormat> input {new InputFormat{input_list[i]}};
+                       _input_formats.emplace(input->name(), move(input));
+               }
+
+       if (const struct sr_output_module **output_list = sr_output_list())
+               for (int i = 0; output_list[i]; i++) {
+                       unique_ptr<OutputFormat> output {new OutputFormat{output_list[i]}};
+                       _output_formats.emplace(output->name(), move(output));
+               }
 }
 
 string Context::package_version()
@@ -154,11 +158,10 @@ string Context::lib_version()
 map<string, shared_ptr<Driver>> Context::drivers()
 {
        map<string, shared_ptr<Driver>> result;
-       for (auto entry: _drivers)
-       {
-               auto name = entry.first;
-               auto driver = entry.second;
-               result[name] = driver->get_shared_pointer(this);
+       for (const auto &entry: _drivers) {
+               const auto &name = entry.first;
+               const auto &driver = entry.second;
+               result.emplace(name, driver->share_owned_by(shared_from_this()));
        }
        return result;
 }
@@ -166,39 +169,57 @@ map<string, shared_ptr<Driver>> Context::drivers()
 map<string, shared_ptr<InputFormat>> Context::input_formats()
 {
        map<string, shared_ptr<InputFormat>> result;
-       for (auto entry: _input_formats)
-       {
-               auto name = entry.first;
-               auto input_format = entry.second;
-               result[name] = input_format->get_shared_pointer(this);
+       for (const auto &entry: _input_formats) {
+               const auto &name = entry.first;
+               const auto &input_format = entry.second;
+               result.emplace(name, input_format->share_owned_by(shared_from_this()));
        }
        return result;
 }
 
+shared_ptr<InputFormat> Context::input_format_match(string filename)
+{
+       const struct sr_input *input;
+       const struct sr_input_module *imod;
+       int rc;
+
+       /*
+        * Have the input module looked up for the specified file.
+        * Failed lookup (or "successful lookup" with an empty result)
+        * are non-fatal. Free the sr_input that was created by the
+        * lookup routine, but grab the input module kind and return an
+        * InputFormat instance to the application. This works because
+        * the application passes a filename, no input data got buffered
+        * in the sr_input that we release.
+        */
+       input = NULL;
+       rc = sr_input_scan_file(filename.c_str(), &input);
+       if (rc != SR_OK)
+               return nullptr;
+       if (!input)
+               return nullptr;
+       imod = sr_input_module_get(input);
+       sr_input_free(input);
+       return shared_ptr<InputFormat>{new InputFormat{imod}, default_delete<InputFormat>{}};
+}
+
 map<string, shared_ptr<OutputFormat>> Context::output_formats()
 {
        map<string, shared_ptr<OutputFormat>> result;
-       for (auto entry: _output_formats)
-       {
-               auto name = entry.first;
-               auto output_format = entry.second;
-               result[name] = output_format->get_shared_pointer(this);
+       for (const auto &entry: _output_formats) {
+               const auto &name = entry.first;
+               const auto &output_format = entry.second;
+               result.emplace(name, output_format->share_owned_by(shared_from_this()));
        }
        return result;
 }
 
 Context::~Context()
 {
-       for (auto entry : _drivers)
-               delete entry.second;
-       for (auto entry : _input_formats)
-               delete entry.second;
-       for (auto entry : _output_formats)
-               delete entry.second;
        check(sr_exit(_structure));
 }
 
-const LogLevel *Context::log_level()
+const LogLevel *Context::log_level() const
 {
        return LogLevel::get(sr_log_loglevel_get());
 }
@@ -208,19 +229,17 @@ void Context::set_log_level(const LogLevel *level)
        check(sr_log_loglevel_set(level->id()));
 }
 
-static int call_log_callback(void *cb_data, int loglevel, const char *format, va_list args)
+static int call_log_callback(void *cb_data, int loglevel,
+               const char *format, va_list args) noexcept
 {
        const unique_ptr<char, decltype(&g_free)>
                message {g_strdup_vprintf(format, args), &g_free};
 
        auto *const callback = static_cast<LogCallbackFunction *>(cb_data);
 
-       try
-       {
+       try {
                (*callback)(LogLevel::get(loglevel), message.get());
-       }
-       catch (Error e)
-       {
+       } catch (Error &e) {
                return e.result;
        }
 
@@ -254,15 +273,16 @@ void Context::set_resource_reader(ResourceReader *reader)
 
 shared_ptr<Session> Context::create_session()
 {
-       return shared_ptr<Session>(
-               new Session(shared_from_this()), Session::Deleter());
+       return shared_ptr<Session>{new Session{shared_from_this()},
+               default_delete<Session>{}};
 }
 
 shared_ptr<UserDevice> Context::create_user_device(
                string vendor, string model, string version)
 {
-       return shared_ptr<UserDevice>(
-               new UserDevice(vendor, model, version), UserDevice::Deleter());
+       return shared_ptr<UserDevice>{
+               new UserDevice{move(vendor), move(model), move(version)},
+               default_delete<UserDevice>{}};
 }
 
 shared_ptr<Packet> Context::create_header_packet(Glib::TimeVal start_time)
@@ -274,27 +294,27 @@ shared_ptr<Packet> Context::create_header_packet(Glib::TimeVal start_time)
        auto packet = g_new(struct sr_datafeed_packet, 1);
        packet->type = SR_DF_HEADER;
        packet->payload = header;
-       return shared_ptr<Packet>(new Packet(nullptr, packet), Packet::Deleter());
+       return shared_ptr<Packet>{new Packet{nullptr, packet},
+               default_delete<Packet>{}};
 }
 
 shared_ptr<Packet> Context::create_meta_packet(
-       const map<const ConfigKey *, Glib::VariantBase> &config)
+       map<const ConfigKey *, Glib::VariantBase> config)
 {
        auto meta = g_new0(struct sr_datafeed_meta, 1);
-       for (auto input : config)
-       {
-               auto key = input.first;
-               auto value = input.second;
-               auto output = g_new(struct sr_config, 1);
+       for (const auto &input : config) {
+               const auto &key = input.first;
+               const auto &value = input.second;
+               auto *const output = g_new(struct sr_config, 1);
                output->key = key->id();
-               output->data = value.gobj();
-               g_variant_ref(output->data);
+               output->data = value.gobj_copy();
                meta->config = g_slist_append(meta->config, output);
        }
        auto packet = g_new(struct sr_datafeed_packet, 1);
        packet->type = SR_DF_META;
        packet->payload = meta;
-       return shared_ptr<Packet>(new Packet(nullptr, packet), Packet::Deleter());
+       return shared_ptr<Packet>{new Packet{nullptr, packet},
+               default_delete<Packet>{}};
 }
 
 shared_ptr<Packet> Context::create_logic_packet(
@@ -307,42 +327,76 @@ shared_ptr<Packet> Context::create_logic_packet(
        auto packet = g_new(struct sr_datafeed_packet, 1);
        packet->type = SR_DF_LOGIC;
        packet->payload = logic;
-       return shared_ptr<Packet>(new Packet(nullptr, packet), Packet::Deleter());
+       return shared_ptr<Packet>{new Packet{nullptr, packet}, default_delete<Packet>{}};
 }
 
 shared_ptr<Packet> Context::create_analog_packet(
-       const vector<shared_ptr<Channel> > &channels,
-       float *data_pointer, unsigned int num_samples, const Quantity *mq,
-       const Unit *unit, const vector<const QuantityFlag *> &mqflags)
+       vector<shared_ptr<Channel> > channels,
+       const float *data_pointer, unsigned int num_samples, const Quantity *mq,
+       const Unit *unit, vector<const QuantityFlag *> mqflags)
 {
        auto analog = g_new0(struct sr_datafeed_analog, 1);
        auto meaning = g_new0(struct sr_analog_meaning, 1);
+       auto encoding = g_new0(struct sr_analog_encoding, 1);
+       auto spec = g_new0(struct sr_analog_spec, 1);
 
        analog->meaning = meaning;
 
-       for (auto channel : channels)
+       for (const auto &channel : channels)
                meaning->channels = g_slist_append(meaning->channels, channel->_structure);
-       analog->num_samples = num_samples;
        meaning->mq = static_cast<sr_mq>(mq->id());
        meaning->unit = static_cast<sr_unit>(unit->id());
-       meaning->mqflags = static_cast<sr_mqflag>(QuantityFlag::mask_from_flags(mqflags));
-       analog->data = data_pointer;
+       meaning->mqflags = static_cast<sr_mqflag>(QuantityFlag::mask_from_flags(move(mqflags)));
+
+       analog->encoding = encoding;
+
+       encoding->unitsize = sizeof(float);
+       encoding->is_signed = TRUE;
+       encoding->is_float = TRUE;
+#ifdef WORDS_BIGENDIAN
+       encoding->is_bigendian = TRUE;
+#else
+       encoding->is_bigendian = FALSE;
+#endif
+       encoding->digits = 0;
+       encoding->is_digits_decimal = FALSE;
+       encoding->scale.p = 1;
+       encoding->scale.q = 1;
+       encoding->offset.p = 0;
+       encoding->offset.q = 1;
+
+       analog->spec = spec;
+
+       spec->spec_digits = 0;
+
+       analog->num_samples = num_samples;
+       analog->data = (float*)data_pointer;
        auto packet = g_new(struct sr_datafeed_packet, 1);
        packet->type = SR_DF_ANALOG;
        packet->payload = analog;
-       return shared_ptr<Packet>(new Packet(nullptr, packet), Packet::Deleter());
+       return shared_ptr<Packet>{new Packet{nullptr, packet}, default_delete<Packet>{}};
+}
+
+shared_ptr<Packet> Context::create_end_packet()
+{
+       auto packet = g_new(struct sr_datafeed_packet, 1);
+       packet->type = SR_DF_END;
+       return shared_ptr<Packet>{new Packet{nullptr, packet},
+               default_delete<Packet>{}};
 }
 
 shared_ptr<Session> Context::load_session(string filename)
 {
-       return shared_ptr<Session>(
-               new Session(shared_from_this(), move(filename)), Session::Deleter());
+       return shared_ptr<Session>{
+               new Session{shared_from_this(), move(filename)},
+               default_delete<Session>{}};
 }
 
 shared_ptr<Trigger> Context::create_trigger(string name)
 {
-       return shared_ptr<Trigger>(
-               new Trigger(shared_from_this(), move(name)), Trigger::Deleter());
+       return shared_ptr<Trigger>{
+               new Trigger{shared_from_this(), move(name)},
+               default_delete<Trigger>{}};
 }
 
 shared_ptr<Input> Context::open_file(string filename)
@@ -350,8 +404,9 @@ shared_ptr<Input> Context::open_file(string filename)
        const struct sr_input *input;
 
        check(sr_input_scan_file(filename.c_str(), &input));
-       return shared_ptr<Input>(
-               new Input(shared_from_this(), input), Input::Deleter());
+       return shared_ptr<Input>{
+               new Input{shared_from_this(), input},
+               default_delete<Input>{}};
 }
 
 shared_ptr<Input> Context::open_stream(string header)
@@ -362,11 +417,12 @@ shared_ptr<Input> Context::open_stream(string header)
        auto ret = sr_input_scan_buffer(gstr, &input);
        g_string_free(gstr, true);
        check(ret);
-       return shared_ptr<Input>(
-               new Input(shared_from_this(), input), Input::Deleter());
+       return shared_ptr<Input>{
+               new Input{shared_from_this(), input},
+               default_delete<Input>{}};
 }
 
-map<string, string> Context::serials(shared_ptr<Driver> driver)
+map<string, string> Context::serials(shared_ptr<Driver> driver) const
 {
        GSList *serial_list = sr_serial_list(driver ? driver->_structure : nullptr);
        map<string, string> serials;
@@ -382,8 +438,8 @@ map<string, string> Context::serials(shared_ptr<Driver> driver)
 }
 
 Driver::Driver(struct sr_dev_driver *structure) :
-       ParentOwned(structure),
        Configurable(structure, nullptr, nullptr),
+       _structure(structure),
        _initialized(false)
 {
 }
@@ -392,35 +448,45 @@ Driver::~Driver()
 {
 }
 
-string Driver::name()
+string Driver::name() const
 {
        return valid_string(_structure->name);
 }
 
-string Driver::long_name()
+string Driver::long_name() const
 {
        return valid_string(_structure->longname);
 }
 
+set<const ConfigKey *> Driver::scan_options() const
+{
+       GArray *opts = sr_driver_scan_options_list(_structure);
+       set<const ConfigKey *> result;
+       if (opts) {
+               for (guint i = 0; i < opts->len; i++)
+                       result.insert(ConfigKey::get(g_array_index(opts, uint32_t, i)));
+               g_array_free(opts, TRUE);
+       }
+       return result;
+}
+
 vector<shared_ptr<HardwareDevice>> Driver::scan(
-       const map<const ConfigKey *, Glib::VariantBase> &options)
+       map<const ConfigKey *, Glib::VariantBase> options)
 {
        /* Initialise the driver if not yet done. */
-       if (!_initialized)
-       {
+       if (!_initialized) {
                check(sr_driver_init(_parent->_structure, _structure));
                _initialized = true;
        }
 
        /* Translate scan options to GSList of struct sr_config pointers. */
        GSList *option_list = nullptr;
-       for (auto entry : options)
-       {
-               auto key = entry.first;
-               auto value = entry.second;
-               auto config = g_new(struct sr_config, 1);
+       for (const auto &entry : options) {
+               const auto &key = entry.first;
+               const auto &value = entry.second;
+               auto *const config = g_new(struct sr_config, 1);
                config->key = key->id();
-               config->data = value.gobj();
+               config->data = const_cast<GVariant*>(value.gobj());
                option_list = g_slist_append(option_list, config);
        }
 
@@ -433,12 +499,12 @@ vector<shared_ptr<HardwareDevice>> Driver::scan(
 
        /* Create device objects. */
        vector<shared_ptr<HardwareDevice>> result;
-       for (GSList *device = device_list; device; device = device->next)
-       {
+       for (GSList *device = device_list; device; device = device->next) {
                auto *const sdi = static_cast<struct sr_dev_inst *>(device->data);
-               result.push_back(shared_ptr<HardwareDevice>(
-                       new HardwareDevice(shared_from_this(), sdi),
-                       HardwareDevice::Deleter()));
+               shared_ptr<HardwareDevice> hwdev {
+                       new HardwareDevice{shared_from_this(), sdi},
+                       default_delete<HardwareDevice>{}};
+               result.push_back(move(hwdev));
        }
 
        /* Free GSList returned from scan. */
@@ -461,7 +527,23 @@ Configurable::~Configurable()
 {
 }
 
-Glib::VariantBase Configurable::config_get(const ConfigKey *key)
+set<const ConfigKey *> Configurable::config_keys() const
+{
+       GArray *opts;
+       set<const ConfigKey *> result;
+
+       opts = sr_dev_options(config_driver, config_sdi, config_channel_group);
+
+       if (opts) {
+               for (guint i = 0; i < opts->len; i++)
+                       result.insert(ConfigKey::get(g_array_index(opts, uint32_t, i)));
+               g_array_free(opts, TRUE);
+       }
+
+       return result;
+}
+
+Glib::VariantBase Configurable::config_get(const ConfigKey *key) const
 {
        GVariant *data;
        check(sr_config_get(
@@ -477,121 +559,80 @@ void Configurable::config_set(const ConfigKey *key, const Glib::VariantBase &val
                key->id(), const_cast<GVariant*>(value.gobj())));
 }
 
-Glib::VariantContainerBase Configurable::config_list(const ConfigKey *key)
-{
-       GVariant *data;
-       check(sr_config_list(
-               config_driver, config_sdi, config_channel_group,
-               key->id(), &data));
-       return Glib::VariantContainerBase(data);
-}
-
-map<const ConfigKey *, set<Capability>> Configurable::config_keys(const ConfigKey *key)
+set<const Capability *> Configurable::config_capabilities(const ConfigKey *key) const
 {
-       GVariant *gvar_opts;
-       gsize num_opts;
-       const uint32_t *opts;
-       map<const ConfigKey *, set<Capability>> result;
-
-       check(sr_config_list(
-               config_driver, config_sdi, config_channel_group,
-               key->id(), &gvar_opts));
-
-       opts = static_cast<const uint32_t *>(g_variant_get_fixed_array(
-               gvar_opts, &num_opts, sizeof(uint32_t)));
+       int caps = sr_dev_config_capabilities_list(config_sdi,
+                               config_channel_group, key->id());
 
-       for (gsize i = 0; i < num_opts; i++)
-       {
-               auto key = ConfigKey::get(opts[i] & SR_CONF_MASK);
-               set<Capability> capabilities;
-               if (opts[i] & SR_CONF_GET)
-                       capabilities.insert(GET);
-               if (opts[i] & SR_CONF_SET)
-                       capabilities.insert(SET);
-               if (opts[i] & SR_CONF_LIST)
-                       capabilities.insert(LIST);
-               result[key] = capabilities;
-       }
+       set<const Capability *> result;
 
-       g_variant_unref(gvar_opts);
+       for (auto cap: Capability::values())
+               if (caps & cap->id())
+                       result.insert(cap);
 
        return result;
 }
 
 bool Configurable::config_check(const ConfigKey *key,
-       const ConfigKey *index_key)
+       const Capability *capability) const
 {
-       GVariant *gvar_opts;
-       gsize num_opts;
-       const uint32_t *opts;
-
-       if (sr_config_list(config_driver, config_sdi, config_channel_group,
-                       index_key->id(), &gvar_opts) != SR_OK)
-               return false;
-
-       opts = static_cast<const uint32_t *>(g_variant_get_fixed_array(
-               gvar_opts, &num_opts, sizeof(uint32_t)));
-
-       for (gsize i = 0; i < num_opts; i++)
-       {
-               if ((opts[i] & SR_CONF_MASK) == unsigned(key->id()))
-               {
-                       g_variant_unref(gvar_opts);
-                       return true;
-               }
-       }
+       int caps = sr_dev_config_capabilities_list(config_sdi,
+                               config_channel_group, key->id());
 
-       g_variant_unref(gvar_opts);
+       return (caps & capability->id());
+}
 
-       return false;
+Glib::VariantContainerBase Configurable::config_list(const ConfigKey *key) const
+{
+       GVariant *data;
+       check(sr_config_list(
+               config_driver, config_sdi, config_channel_group,
+               key->id(), &data));
+       return Glib::VariantContainerBase(data);
 }
 
 Device::Device(struct sr_dev_inst *structure) :
        Configurable(sr_dev_inst_driver_get(structure), structure, nullptr),
        _structure(structure)
 {
-       for (GSList *entry = sr_dev_inst_channels_get(structure); entry; entry = entry->next)
-       {
-               auto *const channel = static_cast<struct sr_channel *>(entry->data);
-               _channels[channel] = new Channel(channel);
+       for (GSList *entry = sr_dev_inst_channels_get(structure); entry; entry = entry->next) {
+               auto *const ch = static_cast<struct sr_channel *>(entry->data);
+               unique_ptr<Channel> channel {new Channel{ch}};
+               _channels.emplace(ch, move(channel));
        }
 
-       for (GSList *entry = sr_dev_inst_channel_groups_get(structure); entry; entry = entry->next)
-       {
-               auto *const group = static_cast<struct sr_channel_group *>(entry->data);
-               _channel_groups[group->name] = new ChannelGroup(this, group);
+       for (GSList *entry = sr_dev_inst_channel_groups_get(structure); entry; entry = entry->next) {
+               auto *const cg = static_cast<struct sr_channel_group *>(entry->data);
+               unique_ptr<ChannelGroup> group {new ChannelGroup{this, cg}};
+               _channel_groups.emplace(group->name(), move(group));
        }
 }
 
 Device::~Device()
 {
-       for (auto entry : _channels)
-               delete entry.second;
-       for (auto entry : _channel_groups)
-               delete entry.second;
 }
 
-string Device::vendor()
+string Device::vendor() const
 {
        return valid_string(sr_dev_inst_vendor_get(_structure));
 }
 
-string Device::model()
+string Device::model() const
 {
        return valid_string(sr_dev_inst_model_get(_structure));
 }
 
-string Device::version()
+string Device::version() const
 {
        return valid_string(sr_dev_inst_version_get(_structure));
 }
 
-string Device::serial_number()
+string Device::serial_number() const
 {
        return valid_string(sr_dev_inst_sernum_get(_structure));
 }
 
-string Device::connection_id()
+string Device::connection_id() const
 {
        return valid_string(sr_dev_inst_connid_get(_structure));
 }
@@ -601,25 +642,24 @@ vector<shared_ptr<Channel>> Device::channels()
        vector<shared_ptr<Channel>> result;
        for (auto channel = sr_dev_inst_channels_get(_structure); channel; channel = channel->next) {
                auto *const ch = static_cast<struct sr_channel *>(channel->data);
-               result.push_back(_channels[ch]->get_shared_pointer(get_shared_from_this()));
+               result.push_back(_channels[ch]->share_owned_by(get_shared_from_this()));
        }
        return result;
 }
 
 shared_ptr<Channel> Device::get_channel(struct sr_channel *ptr)
 {
-       return _channels[ptr]->get_shared_pointer(get_shared_from_this());
+       return _channels[ptr]->share_owned_by(get_shared_from_this());
 }
 
 map<string, shared_ptr<ChannelGroup>>
 Device::channel_groups()
 {
        map<string, shared_ptr<ChannelGroup>> result;
-       for (auto entry: _channel_groups)
-       {
-               auto name = entry.first;
-               auto channel_group = entry.second;
-               result[name] = channel_group->get_shared_pointer(get_shared_from_this());
+       for (const auto &entry: _channel_groups) {
+               const auto &name = entry.first;
+               const auto &channel_group = entry.second;
+               result.emplace(name, channel_group->share_owned_by(get_shared_from_this()));
        }
        return result;
 }
@@ -636,7 +676,6 @@ void Device::close()
 
 HardwareDevice::HardwareDevice(shared_ptr<Driver> driver,
                struct sr_dev_inst *structure) :
-       UserOwned(structure),
        Device(structure),
        _driver(move(driver))
 {
@@ -657,9 +696,8 @@ shared_ptr<Driver> HardwareDevice::driver()
 }
 
 UserDevice::UserDevice(string vendor, string model, string version) :
-       UserOwned(sr_dev_inst_user_new(
-               vendor.c_str(), model.c_str(), version.c_str())),
-       Device(UserOwned::_structure)
+       Device(sr_dev_inst_user_new(
+               vendor.c_str(), model.c_str(), version.c_str()))
 {
 }
 
@@ -679,12 +717,13 @@ shared_ptr<Channel> UserDevice::add_channel(unsigned int index,
                index, type->id(), name.c_str()));
        GSList *const last = g_slist_last(sr_dev_inst_channels_get(Device::_structure));
        auto *const ch = static_cast<struct sr_channel *>(last->data);
-       _channels[ch] = new Channel(ch);
+       unique_ptr<Channel> channel {new Channel{ch}};
+       _channels.emplace(ch, move(channel));
        return get_channel(ch);
 }
 
 Channel::Channel(struct sr_channel *structure) :
-       ParentOwned(structure),
+       _structure(structure),
        _type(ChannelType::get(_structure->type))
 {
 }
@@ -693,7 +732,7 @@ Channel::~Channel()
 {
 }
 
-string Channel::name()
+string Channel::name() const
 {
        return valid_string(_structure->name);
 }
@@ -703,12 +742,12 @@ void Channel::set_name(string name)
        check(sr_dev_channel_name_set(_structure, name.c_str()));
 }
 
-const ChannelType *Channel::type()
+const ChannelType *Channel::type() const
 {
        return ChannelType::get(_structure->type);
 }
 
-bool Channel::enabled()
+bool Channel::enabled() const
 {
        return _structure->enabled;
 }
@@ -718,19 +757,20 @@ void Channel::set_enabled(bool value)
        check(sr_dev_channel_enable(_structure, value));
 }
 
-unsigned int Channel::index()
+unsigned int Channel::index() const
 {
        return _structure->index;
 }
 
-ChannelGroup::ChannelGroup(Device *device,
+ChannelGroup::ChannelGroup(const Device *device,
                struct sr_channel_group *structure) :
-       ParentOwned(structure),
        Configurable(sr_dev_inst_driver_get(device->_structure), device->_structure, structure)
 {
-       for (GSList *entry = structure->channels; entry; entry = entry->next) {
+       for (GSList *entry = config_channel_group->channels; entry; entry = entry->next) {
                auto *const ch = static_cast<struct sr_channel *>(entry->data);
-               _channels.push_back(device->_channels[ch]);
+               /* Note: This relies on Device::_channels to keep the Channel
+                * objects around over the lifetime of the ChannelGroup. */
+               _channels.push_back(device->_channels.find(ch)->second.get());
        }
 }
 
@@ -738,37 +778,36 @@ ChannelGroup::~ChannelGroup()
 {
 }
 
-string ChannelGroup::name()
+string ChannelGroup::name() const
 {
-       return valid_string(_structure->name);
+       return valid_string(config_channel_group->name);
 }
 
 vector<shared_ptr<Channel>> ChannelGroup::channels()
 {
        vector<shared_ptr<Channel>> result;
-       for (auto channel : _channels)
-               result.push_back(channel->get_shared_pointer(_parent));
+       for (const auto &channel : _channels)
+               result.push_back(channel->share_owned_by(_parent));
        return result;
 }
 
-Trigger::Trigger(shared_ptr<Context> context, string name) : 
-       UserOwned(sr_trigger_new(name.c_str())),
+Trigger::Trigger(shared_ptr<Context> context, string name) :
+       _structure(sr_trigger_new(name.c_str())),
        _context(move(context))
 {
-       for (auto stage = _structure->stages; stage; stage = stage->next)
-               _stages.push_back(
-                       new TriggerStage(static_cast<struct sr_trigger_stage *>(stage->data)));
+       for (auto *stage = _structure->stages; stage; stage = stage->next) {
+               unique_ptr<TriggerStage> ts {new TriggerStage{
+                               static_cast<struct sr_trigger_stage *>(stage->data)}};
+               _stages.push_back(move(ts));
+       }
 }
 
 Trigger::~Trigger()
 {
-       for (auto stage: _stages)
-               delete stage;
-
        sr_trigger_free(_structure);
 }
 
-string Trigger::name()
+string Trigger::name() const
 {
        return _structure->name;
 }
@@ -776,30 +815,28 @@ string Trigger::name()
 vector<shared_ptr<TriggerStage>> Trigger::stages()
 {
        vector<shared_ptr<TriggerStage>> result;
-       for (auto stage : _stages)
-               result.push_back(stage->get_shared_pointer(this));
+       for (const auto &stage : _stages)
+               result.push_back(stage->share_owned_by(shared_from_this()));
        return result;
 }
 
 shared_ptr<TriggerStage> Trigger::add_stage()
 {
-       auto stage = new TriggerStage(sr_trigger_stage_add(_structure));
-       _stages.push_back(stage);
-       return stage->get_shared_pointer(this);
+       unique_ptr<TriggerStage> stage {new TriggerStage{sr_trigger_stage_add(_structure)}};
+       _stages.push_back(move(stage));
+       return _stages.back()->share_owned_by(shared_from_this());
 }
 
-TriggerStage::TriggerStage(struct sr_trigger_stage *structure) : 
-       ParentOwned(structure)
+TriggerStage::TriggerStage(struct sr_trigger_stage *structure) :
+       _structure(structure)
 {
 }
 
 TriggerStage::~TriggerStage()
 {
-       for (auto match : _matches)
-               delete match;
 }
-       
-int TriggerStage::number()
+
+int TriggerStage::number() const
 {
        return _structure->stage;
 }
@@ -807,8 +844,8 @@ int TriggerStage::number()
 vector<shared_ptr<TriggerMatch>> TriggerStage::matches()
 {
        vector<shared_ptr<TriggerMatch>> result;
-       for (auto match : _matches)
-               result.push_back(match->get_shared_pointer(this));
+       for (const auto &match : _matches)
+               result.push_back(match->share_owned_by(shared_from_this()));
        return result;
 }
 
@@ -818,9 +855,10 @@ void TriggerStage::add_match(shared_ptr<Channel> channel,
        check(sr_trigger_match_add(_structure,
                channel->_structure, type->id(), value));
        GSList *const last = g_slist_last(_structure->matches);
-       _matches.push_back(new TriggerMatch(
-               static_cast<struct sr_trigger_match *>(last->data),
-               move(channel)));
+       unique_ptr<TriggerMatch> match {new TriggerMatch{
+                       static_cast<struct sr_trigger_match *>(last->data),
+                       move(channel)}};
+       _matches.push_back(move(match));
 }
 
 void TriggerStage::add_match(shared_ptr<Channel> channel,
@@ -831,7 +869,7 @@ void TriggerStage::add_match(shared_ptr<Channel> channel,
 
 TriggerMatch::TriggerMatch(struct sr_trigger_match *structure,
                shared_ptr<Channel> channel) :
-       ParentOwned(structure),
+       _structure(structure),
        _channel(move(channel))
 {
 }
@@ -845,12 +883,12 @@ shared_ptr<Channel> TriggerMatch::channel()
        return _channel;
 }
 
-const TriggerMatchType *TriggerMatch::type()
+const TriggerMatchType *TriggerMatch::type() const
 {
        return TriggerMatchType::get(_structure->match);
 }
 
-float TriggerMatch::value()
+float TriggerMatch::value() const
 {
        return _structure->value;
 }
@@ -866,12 +904,11 @@ void DatafeedCallbackData::run(const struct sr_dev_inst *sdi,
        const struct sr_datafeed_packet *pkt)
 {
        auto device = _session->get_device(sdi);
-       auto packet = shared_ptr<Packet>(new Packet(device, pkt), Packet::Deleter());
+       shared_ptr<Packet> packet {new Packet{device, pkt}, default_delete<Packet>{}};
        _callback(move(device), move(packet));
 }
 
 SessionDevice::SessionDevice(struct sr_dev_inst *structure) :
-       ParentOwned(structure),
        Device(structure)
 {
 }
@@ -886,7 +923,7 @@ shared_ptr<Device> SessionDevice::get_shared_from_this()
 }
 
 Session::Session(shared_ptr<Context> context) :
-       UserOwned(_structure),
+       _structure(nullptr),
        _context(move(context))
 {
        check(sr_session_new(_context->_structure, &_structure));
@@ -894,7 +931,7 @@ Session::Session(shared_ptr<Context> context) :
 }
 
 Session::Session(shared_ptr<Context> context, string filename) :
-       UserOwned(_structure),
+       _structure(nullptr),
        _context(move(context)),
        _filename(move(filename))
 {
@@ -903,27 +940,23 @@ Session::Session(shared_ptr<Context> context, string filename) :
        check(sr_session_dev_list(_structure, &dev_list));
        for (GSList *dev = dev_list; dev; dev = dev->next) {
                auto *const sdi = static_cast<struct sr_dev_inst *>(dev->data);
-               _owned_devices[sdi] = new SessionDevice(sdi);
+               unique_ptr<SessionDevice> device {new SessionDevice{sdi}};
+               _owned_devices.emplace(sdi, move(device));
        }
        _context->_session = this;
+       g_slist_free(dev_list);
 }
 
 Session::~Session()
 {
        check(sr_session_destroy(_structure));
-
-       for (auto callback : _datafeed_callbacks)
-               delete callback;
-
-       for (auto entry : _owned_devices)
-               delete entry.second;
 }
 
 shared_ptr<Device> Session::get_device(const struct sr_dev_inst *sdi)
 {
        if (_owned_devices.count(sdi))
                return static_pointer_cast<Device>(
-                       _owned_devices[sdi]->get_shared_pointer(this));
+                       _owned_devices[sdi]->share_owned_by(shared_from_this()));
        else if (_other_devices.count(sdi))
                return _other_devices[sdi];
        else
@@ -946,6 +979,7 @@ vector<shared_ptr<Device>> Session::devices()
                auto *const sdi = static_cast<struct sr_dev_inst *>(dev->data);
                result.push_back(get_device(sdi));
        }
+       g_slist_free(dev_list);
        return result;
 }
 
@@ -978,7 +1012,7 @@ bool Session::is_running() const
        return (ret != 0);
 }
 
-static void session_stopped_callback(void *data)
+static void session_stopped_callback(void *data) noexcept
 {
        auto *const callback = static_cast<SessionStoppedCallback*>(data);
        (*callback)();
@@ -996,7 +1030,7 @@ void Session::set_stopped_callback(SessionStoppedCallback callback)
 }
 
 static void datafeed_callback(const struct sr_dev_inst *sdi,
-       const struct sr_datafeed_packet *pkt, void *cb_data)
+       const struct sr_datafeed_packet *pkt, void *cb_data) noexcept
 {
        auto callback = static_cast<DatafeedCallbackData *>(cb_data);
        callback->run(sdi, pkt);
@@ -1004,17 +1038,16 @@ static void datafeed_callback(const struct sr_dev_inst *sdi,
 
 void Session::add_datafeed_callback(DatafeedCallbackFunction callback)
 {
-       auto cb_data = new DatafeedCallbackData(this, move(callback));
+       unique_ptr<DatafeedCallbackData> cb_data
+               {new DatafeedCallbackData{this, move(callback)}};
        check(sr_session_datafeed_callback_add(_structure,
-               datafeed_callback, cb_data));
-       _datafeed_callbacks.push_back(cb_data);
+                       &datafeed_callback, cb_data.get()));
+       _datafeed_callbacks.push_back(move(cb_data));
 }
 
 void Session::remove_datafeed_callbacks()
 {
        check(sr_session_datafeed_callback_remove_all(_structure));
-       for (auto callback : _datafeed_callbacks)
-               delete callback;
        _datafeed_callbacks.clear();
 }
 
@@ -1033,7 +1066,7 @@ void Session::set_trigger(shared_ptr<Trigger> trigger)
        _trigger = move(trigger);
 }
 
-string Session::filename()
+string Session::filename() const
 {
        return _filename;
 }
@@ -1045,44 +1078,39 @@ shared_ptr<Context> Session::context()
 
 Packet::Packet(shared_ptr<Device> device,
        const struct sr_datafeed_packet *structure) :
-       UserOwned(structure),
+       _structure(structure),
        _device(move(device))
 {
        switch (structure->type)
        {
                case SR_DF_HEADER:
-                       _payload = new Header(
+                       _payload.reset(new Header{
                                static_cast<const struct sr_datafeed_header *>(
-                                       structure->payload));
+                                       structure->payload)});
                        break;
                case SR_DF_META:
-                       _payload = new Meta(
+                       _payload.reset(new Meta{
                                static_cast<const struct sr_datafeed_meta *>(
-                                       structure->payload));
+                                       structure->payload)});
                        break;
                case SR_DF_LOGIC:
-                       _payload = new Logic(
+                       _payload.reset(new Logic{
                                static_cast<const struct sr_datafeed_logic *>(
-                                       structure->payload));
+                                       structure->payload)});
                        break;
                case SR_DF_ANALOG:
-                       _payload = new Analog(
+                       _payload.reset(new Analog{
                                static_cast<const struct sr_datafeed_analog *>(
-                                       structure->payload));
-                       break;
-               default:
-                       _payload = nullptr;
+                                       structure->payload)});
                        break;
        }
 }
 
 Packet::~Packet()
 {
-       if (_payload)
-               delete _payload;
 }
 
-const PacketType *Packet::type()
+const PacketType *Packet::type() const
 {
        return PacketType::get(_structure->type);
 }
@@ -1090,7 +1118,7 @@ const PacketType *Packet::type()
 shared_ptr<PacketPayload> Packet::payload()
 {
        if (_payload)
-               return _payload->get_shared_pointer(this);
+               return _payload->share_owned_by(shared_from_this());
        else
                throw Error(SR_ERR_NA);
 }
@@ -1104,8 +1132,8 @@ PacketPayload::~PacketPayload()
 }
 
 Header::Header(const struct sr_datafeed_header *structure) :
-       ParentOwned(structure),
-       PacketPayload()
+       PacketPayload(),
+       _structure(structure)
 {
 }
 
@@ -1113,18 +1141,18 @@ Header::~Header()
 {
 }
 
-shared_ptr<PacketPayload> Header::get_shared_pointer(Packet *_parent)
+shared_ptr<PacketPayload> Header::share_owned_by(shared_ptr<Packet> _parent)
 {
        return static_pointer_cast<PacketPayload>(
-               ParentOwned::get_shared_pointer(_parent));
+               ParentOwned::share_owned_by(_parent));
 }
 
-int Header::feed_version()
+int Header::feed_version() const
 {
        return _structure->feed_version;
 }
 
-Glib::TimeVal Header::start_time()
+Glib::TimeVal Header::start_time() const
 {
        return Glib::TimeVal(
                _structure->starttime.tv_sec,
@@ -1132,8 +1160,8 @@ Glib::TimeVal Header::start_time()
 }
 
 Meta::Meta(const struct sr_datafeed_meta *structure) :
-       ParentOwned(structure),
-       PacketPayload()
+       PacketPayload(),
+       _structure(structure)
 {
 }
 
@@ -1141,25 +1169,25 @@ Meta::~Meta()
 {
 }
 
-shared_ptr<PacketPayload> Meta::get_shared_pointer(Packet *_parent)
+shared_ptr<PacketPayload> Meta::share_owned_by(shared_ptr<Packet> _parent)
 {
        return static_pointer_cast<PacketPayload>(
-               ParentOwned::get_shared_pointer(_parent));
+               ParentOwned::share_owned_by(_parent));
 }
 
-map<const ConfigKey *, Glib::VariantBase> Meta::config()
+map<const ConfigKey *, Glib::VariantBase> Meta::config() const
 {
        map<const ConfigKey *, Glib::VariantBase> result;
        for (auto l = _structure->config; l; l = l->next) {
                auto *const config = static_cast<struct sr_config *>(l->data);
-               result[ConfigKey::get(config->key)] = Glib::VariantBase(config->data);
+               result[ConfigKey::get(config->key)] = Glib::VariantBase(config->data, true);
        }
        return result;
 }
 
 Logic::Logic(const struct sr_datafeed_logic *structure) :
-       ParentOwned(structure),
-       PacketPayload()
+       PacketPayload(),
+       _structure(structure)
 {
 }
 
@@ -1167,10 +1195,10 @@ Logic::~Logic()
 {
 }
 
-shared_ptr<PacketPayload> Logic::get_shared_pointer(Packet *_parent)
+shared_ptr<PacketPayload> Logic::share_owned_by(shared_ptr<Packet> _parent)
 {
        return static_pointer_cast<PacketPayload>(
-               ParentOwned::get_shared_pointer(_parent));
+               ParentOwned::share_owned_by(_parent));
 }
 
 void *Logic::data_pointer()
@@ -1178,19 +1206,19 @@ void *Logic::data_pointer()
        return _structure->data;
 }
 
-size_t Logic::data_length()
+size_t Logic::data_length() const
 {
        return _structure->length;
 }
 
-unsigned int Logic::unit_size()
+unsigned int Logic::unit_size() const
 {
        return _structure->unitsize;
 }
 
 Analog::Analog(const struct sr_datafeed_analog *structure) :
-       ParentOwned(structure),
-       PacketPayload()
+       PacketPayload(),
+       _structure(structure)
 {
 }
 
@@ -1198,10 +1226,10 @@ Analog::~Analog()
 {
 }
 
-shared_ptr<PacketPayload> Analog::get_shared_pointer(Packet *_parent)
+shared_ptr<PacketPayload> Analog::share_owned_by(shared_ptr<Packet> _parent)
 {
        return static_pointer_cast<PacketPayload>(
-               ParentOwned::get_shared_pointer(_parent));
+               ParentOwned::share_owned_by(_parent));
 }
 
 void *Analog::data_pointer()
@@ -1209,7 +1237,12 @@ void *Analog::data_pointer()
        return _structure->data;
 }
 
-unsigned int Analog::num_samples()
+void Analog::get_data_as_float(float *dest)
+{
+       check(sr_analog_to_float(_structure, dest));
+}
+
+unsigned int Analog::num_samples() const
 {
        return _structure->num_samples;
 }
@@ -1224,23 +1257,147 @@ vector<shared_ptr<Channel>> Analog::channels()
        return result;
 }
 
-const Quantity *Analog::mq()
+unsigned int Analog::unitsize() const
+{
+       return _structure->encoding->unitsize;
+}
+
+bool Analog::is_signed() const
+{
+       return _structure->encoding->is_signed;
+}
+
+bool Analog::is_float() const
+{
+       return _structure->encoding->is_float;
+}
+
+bool Analog::is_bigendian() const
+{
+       return _structure->encoding->is_bigendian;
+}
+
+int Analog::digits() const
+{
+       return _structure->encoding->digits;
+}
+
+bool Analog::is_digits_decimal() const
+{
+       return _structure->encoding->is_digits_decimal;
+}
+
+shared_ptr<Rational> Analog::scale()
+{
+       unique_ptr<Rational> scale;
+       scale.reset(new Rational(&(_structure->encoding->scale)));
+
+       if (scale)
+               return scale->share_owned_by(shared_from_this());
+       else
+               throw Error(SR_ERR_NA);
+}
+
+shared_ptr<Rational> Analog::offset()
+{
+       unique_ptr<Rational> offset;
+       offset.reset(new Rational(&(_structure->encoding->offset)));
+
+       if (offset)
+               return offset->share_owned_by(shared_from_this());
+       else
+               throw Error(SR_ERR_NA);
+}
+
+const Quantity *Analog::mq() const
 {
        return Quantity::get(_structure->meaning->mq);
 }
 
-const Unit *Analog::unit()
+const Unit *Analog::unit() const
 {
        return Unit::get(_structure->meaning->unit);
 }
 
-vector<const QuantityFlag *> Analog::mq_flags()
+vector<const QuantityFlag *> Analog::mq_flags() const
 {
        return QuantityFlag::flags_from_mask(_structure->meaning->mqflags);
 }
 
+shared_ptr<Logic> Analog::get_logic_via_threshold(float threshold,
+       uint8_t *data_ptr) const
+{
+       auto datafeed = g_new(struct sr_datafeed_logic, 1);
+       datafeed->length = num_samples();
+       datafeed->unitsize = 1;
+
+       if (data_ptr)
+               datafeed->data = data_ptr;
+       else
+               datafeed->data = g_malloc(datafeed->length);
+
+       shared_ptr<Logic> logic =
+               shared_ptr<Logic>{new Logic{datafeed}, default_delete<Logic>{}};
+
+       check(sr_a2l_threshold(_structure, threshold,
+               (uint8_t*)datafeed->data, datafeed->length));
+
+       return logic;
+}
+
+shared_ptr<Logic> Analog::get_logic_via_schmitt_trigger(float lo_thr,
+       float hi_thr, uint8_t *state, uint8_t *data_ptr) const
+{
+       auto datafeed = g_new(struct sr_datafeed_logic, 1);
+       datafeed->length = num_samples();
+       datafeed->unitsize = 1;
+
+       if (data_ptr)
+               datafeed->data = data_ptr;
+       else
+               datafeed->data = g_malloc(datafeed->length);
+
+       shared_ptr<Logic> logic =
+               shared_ptr<Logic>{new Logic{datafeed}, default_delete<Logic>{}};
+
+       check(sr_a2l_schmitt_trigger(_structure, lo_thr, hi_thr, state,
+               (uint8_t*)datafeed->data, datafeed->length));
+
+       return logic;
+}
+
+Rational::Rational(const struct sr_rational *structure) :
+       _structure(structure)
+{
+}
+
+Rational::~Rational()
+{
+}
+
+shared_ptr<Rational> Rational::share_owned_by(shared_ptr<Analog> _parent)
+{
+       return static_pointer_cast<Rational>(
+               ParentOwned::share_owned_by(_parent));
+}
+
+int64_t Rational::numerator() const
+{
+       return _structure->p;
+}
+
+uint64_t Rational::denominator() const
+{
+       return _structure->q;
+}
+
+float Rational::value() const
+{
+       return (float)(_structure->p) / (float)(_structure->q);
+}
+
 InputFormat::InputFormat(const struct sr_input_module *structure) :
-       ParentOwned(structure)
+       _structure(structure)
 {
 }
 
@@ -1248,17 +1405,17 @@ InputFormat::~InputFormat()
 {
 }
 
-string InputFormat::name()
+string InputFormat::name() const
 {
        return valid_string(sr_input_id_get(_structure));
 }
 
-string InputFormat::description()
+string InputFormat::description() const
 {
        return valid_string(sr_input_description_get(_structure));
 }
 
-vector<string> InputFormat::extensions()
+vector<string> InputFormat::extensions() const
 {
        vector<string> exts;
        for (const char *const *e = sr_input_extensions_get(_structure);
@@ -1269,54 +1426,53 @@ vector<string> InputFormat::extensions()
 
 map<string, shared_ptr<Option>> InputFormat::options()
 {
-       const struct sr_option **options = sr_input_options_get(_structure);
        map<string, shared_ptr<Option>> result;
-       if (options)
-       {
-               auto option_array = shared_ptr<const struct sr_option *>(
-                       options, sr_input_options_free);
-               for (int i = 0; options[i]; i++)
-                       result[options[i]->id] = shared_ptr<Option>(
-                               new Option(options[i], option_array), Option::Deleter());
+
+       if (const struct sr_option **options = sr_input_options_get(_structure)) {
+               shared_ptr<const struct sr_option *> option_array
+                       {options, &sr_input_options_free};
+               for (int i = 0; options[i]; i++) {
+                       shared_ptr<Option> opt {
+                               new Option{options[i], option_array},
+                               default_delete<Option>{}};
+                       result.emplace(opt->id(), move(opt));
+               }
        }
        return result;
 }
 
 shared_ptr<Input> InputFormat::create_input(
-       const map<string, Glib::VariantBase> &options)
+       map<string, Glib::VariantBase> options)
 {
        auto input = sr_input_new(_structure, map_to_hash_variant(options));
        if (!input)
                throw Error(SR_ERR_ARG);
-       return shared_ptr<Input>(
-               new Input(_parent->shared_from_this(), input), Input::Deleter());
+       return shared_ptr<Input>{new Input{_parent, input}, default_delete<Input>{}};
 }
 
 Input::Input(shared_ptr<Context> context, const struct sr_input *structure) :
-       UserOwned(structure),
-       _context(move(context)),
-       _device(nullptr)
+       _structure(structure),
+       _context(move(context))
 {
 }
 
 shared_ptr<InputDevice> Input::device()
 {
-       if (!_device)
-       {
+       if (!_device) {
                auto sdi = sr_input_dev_inst_get(_structure);
                if (!sdi)
                        throw Error(SR_ERR_NA);
-               _device = new InputDevice(shared_from_this(), sdi);
+               _device.reset(new InputDevice{shared_from_this(), sdi});
        }
 
-       return _device->get_shared_pointer(shared_from_this());
+       return _device->share_owned_by(shared_from_this());
 }
 
 void Input::send(void *data, size_t length)
 {
        auto gstr = g_string_new_len(static_cast<char *>(data), length);
        auto ret = sr_input_send(_structure, gstr);
-       g_string_free(gstr, false);
+       g_string_free(gstr, true);
        check(ret);
 }
 
@@ -1325,16 +1481,18 @@ void Input::end()
        check(sr_input_end(_structure));
 }
 
+void Input::reset()
+{
+       check(sr_input_reset(_structure));
+}
+
 Input::~Input()
 {
-       if (_device)
-               delete _device;
        sr_input_free(_structure);
 }
 
 InputDevice::InputDevice(shared_ptr<Input> input,
                struct sr_dev_inst *structure) :
-       ParentOwned(structure),
        Device(structure),
        _input(move(input))
 {
@@ -1351,7 +1509,7 @@ shared_ptr<Device> InputDevice::get_shared_from_this()
 
 Option::Option(const struct sr_option *structure,
                shared_ptr<const struct sr_option *> structure_array) :
-       UserOwned(structure),
+       _structure(structure),
        _structure_array(move(structure_array))
 {
 }
@@ -1360,27 +1518,27 @@ Option::~Option()
 {
 }
 
-string Option::id()
+string Option::id() const
 {
        return valid_string(_structure->id);
 }
 
-string Option::name()
+string Option::name() const
 {
        return valid_string(_structure->name);
 }
 
-string Option::description()
+string Option::description() const
 {
        return valid_string(_structure->desc);
 }
 
-Glib::VariantBase Option::default_value()
+Glib::VariantBase Option::default_value() const
 {
        return Glib::VariantBase(_structure->def, true);
 }
 
-vector<Glib::VariantBase> Option::values()
+vector<Glib::VariantBase> Option::values() const
 {
        vector<Glib::VariantBase> result;
        for (auto l = _structure->values; l; l = l->next) {
@@ -1390,8 +1548,30 @@ vector<Glib::VariantBase> Option::values()
        return result;
 }
 
+Glib::VariantBase Option::parse_string(string value)
+{
+       enum sr_datatype dt;
+       Glib::VariantBase dflt = default_value();
+       GVariant *tmpl = dflt.gobj();
+
+       if (g_variant_is_of_type(tmpl, G_VARIANT_TYPE_UINT64)) {
+               dt = SR_T_UINT64;
+       } else if (g_variant_is_of_type(tmpl, G_VARIANT_TYPE_STRING)) {
+               dt = SR_T_STRING;
+       } else if (g_variant_is_of_type(tmpl, G_VARIANT_TYPE_BOOLEAN)) {
+               dt = SR_T_BOOL;
+       } else if (g_variant_is_of_type(tmpl, G_VARIANT_TYPE_DOUBLE)) {
+               dt = SR_T_FLOAT;
+       } else if (g_variant_is_of_type(tmpl, G_VARIANT_TYPE_INT32)) {
+               dt = SR_T_INT32;
+       } else {
+               throw Error(SR_ERR_BUG);
+       }
+       return ConfigKey::parse_string(value, dt);
+}
+
 OutputFormat::OutputFormat(const struct sr_output_module *structure) :
-       ParentOwned(structure)
+       _structure(structure)
 {
 }
 
@@ -1399,17 +1579,17 @@ OutputFormat::~OutputFormat()
 {
 }
 
-string OutputFormat::name()
+string OutputFormat::name() const
 {
        return valid_string(sr_output_id_get(_structure));
 }
 
-string OutputFormat::description()
+string OutputFormat::description() const
 {
        return valid_string(sr_output_description_get(_structure));
 }
 
-vector<string> OutputFormat::extensions()
+vector<string> OutputFormat::extensions() const
 {
        vector<string> exts;
        for (const char *const *e = sr_output_extensions_get(_structure);
@@ -1420,57 +1600,59 @@ vector<string> OutputFormat::extensions()
 
 map<string, shared_ptr<Option>> OutputFormat::options()
 {
-       const struct sr_option **options = sr_output_options_get(_structure);
        map<string, shared_ptr<Option>> result;
-       if (options)
-       {
-               auto option_array = shared_ptr<const struct sr_option *>(
-                       options, sr_output_options_free);
-               for (int i = 0; options[i]; i++)
-                       result[options[i]->id] = shared_ptr<Option>(
-                               new Option(options[i], option_array), Option::Deleter());
+
+       if (const struct sr_option **options = sr_output_options_get(_structure)) {
+               shared_ptr<const struct sr_option *> option_array
+                       {options, &sr_output_options_free};
+               for (int i = 0; options[i]; i++) {
+                       shared_ptr<Option> opt {
+                               new Option{options[i], option_array},
+                               default_delete<Option>{}};
+                       result.emplace(opt->id(), move(opt));
+               }
        }
        return result;
 }
 
 shared_ptr<Output> OutputFormat::create_output(
-       shared_ptr<Device> device, const map<string, Glib::VariantBase> &options)
+       shared_ptr<Device> device, map<string, Glib::VariantBase> options)
 {
-       return shared_ptr<Output>(
-               new Output(shared_from_this(), move(device), options),
-               Output::Deleter());
+       return shared_ptr<Output>{
+               new Output{shared_from_this(), move(device), move(options)},
+               default_delete<Output>{}};
 }
 
 shared_ptr<Output> OutputFormat::create_output(string filename,
-       shared_ptr<Device> device, const map<string, Glib::VariantBase> &options)
+       shared_ptr<Device> device, map<string, Glib::VariantBase> options)
 {
-       return shared_ptr<Output>(
-               new Output(move(filename), shared_from_this(), move(device), options),
-               Output::Deleter());
+       return shared_ptr<Output>{
+               new Output{move(filename), shared_from_this(), move(device), move(options)},
+               default_delete<Output>{}};
 }
 
-bool OutputFormat::test_flag(const OutputFlag *flag)
+bool OutputFormat::test_flag(const OutputFlag *flag) const
 {
        return sr_output_test_flag(_structure, flag->id());
 }
 
 Output::Output(shared_ptr<OutputFormat> format,
-               shared_ptr<Device> device, const map<string, Glib::VariantBase> &options) :
-       UserOwned(sr_output_new(format->_structure,
+               shared_ptr<Device> device, map<string, Glib::VariantBase> options) :
+       _structure(sr_output_new(format->_structure,
                map_to_hash_variant(options), device->_structure, nullptr)),
        _format(move(format)),
        _device(move(device)),
-       _options(options)
+       _options(move(options))
 {
 }
 
 Output::Output(string filename, shared_ptr<OutputFormat> format,
-               shared_ptr<Device> device, const map<string, Glib::VariantBase> &options) :
-       UserOwned(sr_output_new(format->_structure,
+               shared_ptr<Device> device, map<string, Glib::VariantBase> options) :
+       _structure(sr_output_new(format->_structure,
                map_to_hash_variant(options), device->_structure, filename.c_str())),
        _format(move(format)),
        _device(move(device)),
-       _options(options)
+       _options(move(options))
 {
 }
 
@@ -1479,18 +1661,20 @@ Output::~Output()
        check(sr_output_free(_structure));
 }
 
+shared_ptr<OutputFormat> Output::format()
+{
+       return _format;
+}
+
 string Output::receive(shared_ptr<Packet> packet)
 {
        GString *out;
        check(sr_output_send(_structure, packet->_structure, &out));
-       if (out)
-       {
+       if (out) {
                auto result = string(out->str, out->str + out->len);
                g_string_free(out, true);
                return result;
-       }
-       else
-       {
+       } else {
                return string();
        }
 }