MainWindow: Handle device selection failure

[pulseview.git] / pv / sigsession.cpp

/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2012-14 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#ifdef ENABLE_DECODE
#include <libsigrokdecode/libsigrokdecode.h>
#endif

#include "sigsession.hpp"

#include "devicemanager.hpp"

#include "data/analog.hpp"
#include "data/analogsnapshot.hpp"
#include "data/decoderstack.hpp"
#include "data/logic.hpp"
#include "data/logicsnapshot.hpp"
#include "data/decode/decoder.hpp"

#include "view/analogsignal.hpp"
#include "view/decodetrace.hpp"
#include "view/logicsignal.hpp"

#include <cassert>
#include <mutex>
#include <stdexcept>

#include <sys/stat.h>

#include <QDebug>

#include <libsigrok/libsigrok.hpp>

using boost::shared_lock;
using boost::shared_mutex;
using boost::unique_lock;

using std::dynamic_pointer_cast;
using std::function;
using std::lock_guard;
using std::list;
using std::map;
using std::mutex;
using std::set;
using std::shared_ptr;
using std::string;
using std::vector;

using sigrok::Analog;
using sigrok::Channel;
using sigrok::ChannelType;
using sigrok::ConfigKey;
using sigrok::DatafeedCallbackFunction;
using sigrok::Device;
using sigrok::Error;
using sigrok::HardwareDevice;
using sigrok::Header;
using sigrok::Logic;
using sigrok::Meta;
using sigrok::Packet;
using sigrok::PacketPayload;
using sigrok::Session;
using sigrok::SessionDevice;

using Glib::VariantBase;
using Glib::Variant;

namespace pv {
Session::Session(DeviceManager &device_manager) :
	device_manager_(device_manager),
	session_(device_manager.context()->create_session()),
	capture_state_(Stopped)
{
	set_default_device();
}

Session::~Session()
{
	// Stop and join to the thread
	stop_capture();
}

DeviceManager& Session::device_manager()
{
	return device_manager_;
}

const DeviceManager& Session::device_manager() const
{
	return device_manager_;
}

const shared_ptr<sigrok::Session>& Session::session() const
{
	return session_;
}

shared_ptr<Device> Session::device() const
{
	return device_;
}

void Session::set_device(shared_ptr<Device> device)
{
	// Ensure we are not capturing before setting the device
	stop_capture();

	// Are we setting a session device?
	auto session_device = dynamic_pointer_cast<SessionDevice>(device);
	// Did we have a session device selected previously?
	auto prev_session_device = dynamic_pointer_cast<SessionDevice>(device_);

	if (device_) {
		session_->remove_datafeed_callbacks();
		if (!prev_session_device) {
			device_->close();
			session_->remove_devices();
		}
	}

	if (session_device)
		session_ = session_device->parent();

	decode_traces_.clear();

	if (device) {
		if (!session_device)
		{
			session_ = device_manager_.context()->create_session();

			try {
				device->open();
			} catch(const sigrok::Error &e) {
				throw QString(e.what());
			}

			session_->add_device(device);
		}

		device_ = device;
		session_->add_datafeed_callback([=]
			(shared_ptr<Device> device, shared_ptr<Packet> packet) {
				data_feed_in(device, packet);
			});
		update_signals(device);
	} else
		device_ = nullptr;

	device_selected();
}

void Session::set_file(const string &name)
{
	session_ = device_manager_.context()->load_session(name);
	device_ = session_->devices()[0];
	decode_traces_.clear();
	session_->add_datafeed_callback([=]
		(shared_ptr<Device> device, shared_ptr<Packet> packet) {
			data_feed_in(device, packet);
		});
	device_manager_.update_display_name(device_);
	update_signals(device_);
	device_selected();
}

void Session::set_default_device()
{
	shared_ptr<HardwareDevice> default_device;
	const list< shared_ptr<HardwareDevice> > &devices =
		device_manager_.devices();

	if (!devices.empty()) {
		// Fall back to the first device in the list.
		default_device = devices.front();

		// Try and find the demo device and select that by default
		for (shared_ptr<HardwareDevice> dev : devices)
			if (dev->driver()->name().compare("demo") == 0) {
				default_device = dev;
				break;
			}

		set_device(default_device);
	}
}

Session::capture_state Session::get_capture_state() const
{
	lock_guard<mutex> lock(sampling_mutex_);
	return capture_state_;
}

void Session::start_capture(function<void (const QString)> error_handler)
{
	stop_capture();

	// Check that a device instance has been selected.
	if (!device_) {
		qDebug() << "No device selected";
		return;
	}

	// Check that at least one channel is enabled
	auto channels = device_->channels();
	bool enabled = std::any_of(channels.begin(), channels.end(),
		[](shared_ptr<Channel> channel) { return channel->enabled(); });

	if (!enabled) {
		error_handler(tr("No channels enabled."));
		return;
	}

	// Begin the session
	sampling_thread_ = std::thread(
		&Session::sample_thread_proc, this, device_,
			error_handler);
}

void Session::stop_capture()
{
	if (get_capture_state() != Stopped)
		session_->stop();

	// Check that sampling stopped
	if (sampling_thread_.joinable())
		sampling_thread_.join();
}

set< shared_ptr<data::SignalData> > Session::get_data() const
{
	shared_lock<shared_mutex> lock(signals_mutex_);
	set< shared_ptr<data::SignalData> > data;
	for (const shared_ptr<view::Signal> sig : signals_) {
		assert(sig);
		data.insert(sig->data());
	}

	return data;
}

boost::shared_mutex& Session::signals_mutex() const
{
	return signals_mutex_;
}

const vector< shared_ptr<view::Signal> >& Session::signals() const
{
	return signals_;
}

#ifdef ENABLE_DECODE
bool Session::add_decoder(srd_decoder *const dec)
{
	map<const srd_channel*, shared_ptr<view::LogicSignal> > channels;
	shared_ptr<data::DecoderStack> decoder_stack;

	try
	{
		lock_guard<boost::shared_mutex> lock(signals_mutex_);

		// Create the decoder
		decoder_stack = shared_ptr<data::DecoderStack>(
			new data::DecoderStack(*this, dec));

		// Make a list of all the channels
		std::vector<const srd_channel*> all_channels;
		for(const GSList *i = dec->channels; i; i = i->next)
			all_channels.push_back((const srd_channel*)i->data);
		for(const GSList *i = dec->opt_channels; i; i = i->next)
			all_channels.push_back((const srd_channel*)i->data);

		// Auto select the initial channels
		for (const srd_channel *pdch : all_channels)
			for (shared_ptr<view::Signal> s : signals_)
			{
				shared_ptr<view::LogicSignal> l =
					dynamic_pointer_cast<view::LogicSignal>(s);
				if (l && QString::fromUtf8(pdch->name).
					toLower().contains(
					l->name().toLower()))
					channels[pdch] = l;
			}

		assert(decoder_stack);
		assert(!decoder_stack->stack().empty());
		assert(decoder_stack->stack().front());
		decoder_stack->stack().front()->set_channels(channels);

		// Create the decode signal
		shared_ptr<view::DecodeTrace> d(
			new view::DecodeTrace(*this, decoder_stack,
				decode_traces_.size()));
		decode_traces_.push_back(d);
	}
	catch(std::runtime_error e)
	{
		return false;
	}

	signals_changed();

	// Do an initial decode
	decoder_stack->begin_decode();

	return true;
}

vector< shared_ptr<view::DecodeTrace> > Session::get_decode_signals() const
{
	shared_lock<shared_mutex> lock(signals_mutex_);
	return decode_traces_;
}

void Session::remove_decode_signal(view::DecodeTrace *signal)
{
	for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
		if ((*i).get() == signal)
		{
			decode_traces_.erase(i);
			signals_changed();
			return;
		}
}
#endif

void Session::set_capture_state(capture_state state)
{
	lock_guard<mutex> lock(sampling_mutex_);
	const bool changed = capture_state_ != state;
	capture_state_ = state;
	if(changed)
		capture_state_changed(state);
}

void Session::update_signals(shared_ptr<Device> device)
{
	assert(device);
	assert(capture_state_ == Stopped);

	// Clear the decode traces
	decode_traces_.clear();

	// Detect what data types we will receive
	auto channels = device->channels();
	unsigned int logic_channel_count = std::count_if(
		channels.begin(), channels.end(),
		[] (shared_ptr<Channel> channel) {
			return channel->type() == ChannelType::LOGIC; });

	// Create data containers for the logic data snapshots
	{
		lock_guard<mutex> data_lock(data_mutex_);

		logic_data_.reset();
		if (logic_channel_count != 0) {
			logic_data_.reset(new data::Logic(
				logic_channel_count));
			assert(logic_data_);
		}
	}

	// Make the Signals list
	{
		unique_lock<shared_mutex> lock(signals_mutex_);

		signals_.clear();

		for (auto channel : device->channels()) {
			shared_ptr<view::Signal> signal;

			switch(channel->type()->id()) {
			case SR_CHANNEL_LOGIC:
				signal = shared_ptr<view::Signal>(
					new view::LogicSignal(*this, device,
						channel, logic_data_));
				break;

			case SR_CHANNEL_ANALOG:
			{
				shared_ptr<data::Analog> data(
					new data::Analog());
				signal = shared_ptr<view::Signal>(
					new view::AnalogSignal(
						*this, channel, data));
				break;
			}

			default:
				assert(0);
				break;
			}

			assert(signal);
			signals_.push_back(signal);
		}

	}

	signals_changed();
}

shared_ptr<view::Signal> Session::signal_from_channel(
	shared_ptr<Channel> channel) const
{
	lock_guard<boost::shared_mutex> lock(signals_mutex_);
	for (shared_ptr<view::Signal> sig : signals_) {
		assert(sig);
		if (sig->channel() == channel)
			return sig;
	}
	return shared_ptr<view::Signal>();
}

void Session::read_sample_rate(shared_ptr<Device> device)
{
	const auto keys = device_->config_keys(ConfigKey::DEVICE_OPTIONS);
	const auto iter = keys.find(ConfigKey::SAMPLERATE);
	const uint64_t sample_rate = (iter != keys.end() &&
		(*iter).second.find(sigrok::GET) != (*iter).second.end()) ?
		VariantBase::cast_dynamic<Variant<guint64>>(
			device->config_get(ConfigKey::SAMPLERATE)).get() : 0;

	// Set the sample rate of all data
	const set< shared_ptr<data::SignalData> > data_set = get_data();
	for (shared_ptr<data::SignalData> data : data_set) {
		assert(data);
		data->set_samplerate(sample_rate);
	}
}

void Session::sample_thread_proc(shared_ptr<Device> device,
	function<void (const QString)> error_handler)
{
	assert(device);
	assert(error_handler);

	read_sample_rate(device);

	try {
		session_->start();
	} catch(Error e) {
		error_handler(e.what());
		return;
	}

	set_capture_state(session_->trigger() ?
		AwaitingTrigger : Running);

	session_->run();
	set_capture_state(Stopped);

	// Confirm that SR_DF_END was received
	if (cur_logic_snapshot_)
	{
		qDebug("SR_DF_END was not received.");
		assert(0);
	}
}

void Session::feed_in_header(shared_ptr<Device> device)
{
	read_sample_rate(device);
}

void Session::feed_in_meta(shared_ptr<Device> device,
	shared_ptr<Meta> meta)
{
	(void)device;

	for (auto entry : meta->config()) {
		switch (entry.first->id()) {
		case SR_CONF_SAMPLERATE:
			/// @todo handle samplerate changes
			break;
		default:
			// Unknown metadata is not an error.
			break;
		}
	}

	signals_changed();
}

void Session::feed_in_frame_begin()
{
	if (cur_logic_snapshot_ || !cur_analog_snapshots_.empty())
		frame_began();
}

void Session::feed_in_logic(shared_ptr<Logic> logic)
{
	lock_guard<mutex> lock(data_mutex_);

	if (!logic_data_)
	{
		qDebug() << "Unexpected logic packet";
		return;
	}

	if (!cur_logic_snapshot_)
	{
		// This could be the first packet after a trigger
		set_capture_state(Running);

		// Get sample limit.
		const auto keys = device_->config_keys(
			ConfigKey::DEVICE_OPTIONS);
		const auto iter = keys.find(ConfigKey::LIMIT_SAMPLES);
		const uint64_t sample_limit = (iter != keys.end() &&
			(*iter).second.find(sigrok::GET) !=
			(*iter).second.end()) ?
			VariantBase::cast_dynamic<Variant<guint64>>(
			device_->config_get(ConfigKey::LIMIT_SAMPLES)).get() : 0;

		// Create a new data snapshot
		cur_logic_snapshot_ = shared_ptr<data::LogicSnapshot>(
			new data::LogicSnapshot(logic, sample_limit));
		logic_data_->push_snapshot(cur_logic_snapshot_);

		// @todo Putting this here means that only listeners querying
		// for logic will be notified. Currently the only user of
		// frame_began is DecoderStack, but in future we need to signal
		// this after both analog and logic sweeps have begun.
		frame_began();
	}
	else
	{
		// Append to the existing data snapshot
		cur_logic_snapshot_->append_payload(logic);
	}

	data_received();
}

void Session::feed_in_analog(shared_ptr<Analog> analog)
{
	lock_guard<mutex> lock(data_mutex_);

	const vector<shared_ptr<Channel>> channels = analog->channels();
	const unsigned int channel_count = channels.size();
	const size_t sample_count = analog->num_samples() / channel_count;
	const float *data = analog->data_pointer();
	bool sweep_beginning = false;

	for (auto channel : channels)
	{
		shared_ptr<data::AnalogSnapshot> snapshot;

		// Try to get the snapshot of the channel
		const map< shared_ptr<Channel>, shared_ptr<data::AnalogSnapshot> >::
			iterator iter = cur_analog_snapshots_.find(channel);
		if (iter != cur_analog_snapshots_.end())
			snapshot = (*iter).second;
		else
		{
			// If no snapshot was found, this means we havn't
			// created one yet. i.e. this is the first packet
			// in the sweep containing this snapshot.
			sweep_beginning = true;

			// Get sample limit.
			uint64_t sample_limit;
			try {
				sample_limit = VariantBase::cast_dynamic<Variant<guint64>>(
					device_->config_get(ConfigKey::LIMIT_SAMPLES)).get();
			} catch (Error) {
				sample_limit = 0;
			}

			// Create a snapshot, keep it in the maps of channels
			snapshot = shared_ptr<data::AnalogSnapshot>(
				new data::AnalogSnapshot(sample_limit));
			cur_analog_snapshots_[channel] = snapshot;

			// Find the annalog data associated with the channel
			shared_ptr<view::AnalogSignal> sig =
				dynamic_pointer_cast<view::AnalogSignal>(
					signal_from_channel(channel));
			assert(sig);

			shared_ptr<data::Analog> data(sig->analog_data());
			assert(data);

			// Push the snapshot into the analog data.
			data->push_snapshot(snapshot);
		}

		assert(snapshot);

		// Append the samples in the snapshot
		snapshot->append_interleaved_samples(data++, sample_count,
			channel_count);
	}

	if (sweep_beginning) {
		// This could be the first packet after a trigger
		set_capture_state(Running);
	}

	data_received();
}

void Session::data_feed_in(shared_ptr<Device> device, shared_ptr<Packet> packet)
{
	assert(device);
	assert(packet);

	switch (packet->type()->id()) {
	case SR_DF_HEADER:
		feed_in_header(device);
		break;

	case SR_DF_META:
		feed_in_meta(device, dynamic_pointer_cast<Meta>(packet->payload()));
		break;

	case SR_DF_FRAME_BEGIN:
		feed_in_frame_begin();
		break;

	case SR_DF_LOGIC:
		feed_in_logic(dynamic_pointer_cast<Logic>(packet->payload()));
		break;

	case SR_DF_ANALOG:
		feed_in_analog(dynamic_pointer_cast<Analog>(packet->payload()));
		break;

	case SR_DF_END:
	{
		{
			lock_guard<mutex> lock(data_mutex_);
			cur_logic_snapshot_.reset();
			cur_analog_snapshots_.clear();
		}
		frame_ended();
		break;
	}
	default:
		break;
	}
}

} // namespace pv