[pulseview.git] / pv / session.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 _WIN32
// Windows: Avoid boost/thread namespace pollution (which includes windows.h).
#define NOGDI
#define NORESOURCE
#endif
#include <boost/thread/locks.hpp>
#include <boost/thread/shared_mutex.hpp>

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

#include "session.hpp"

#include "devicemanager.hpp"

#include "data/analog.hpp"
#include "data/analogsegment.hpp"
#include "data/decoderstack.hpp"
#include "data/logic.hpp"
#include "data/logicsegment.hpp"
#include "data/decode/decoder.hpp"

#include "devices/hardwaredevice.hpp"
#include "devices/sessionfile.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 <libsigrokcxx/libsigrokcxx.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::recursive_mutex;
using std::set;
using std::shared_ptr;
using std::string;
using std::unordered_set;
using std::vector;

using sigrok::Analog;
using sigrok::Channel;
using sigrok::ChannelType;
using sigrok::ConfigKey;
using sigrok::DatafeedCallbackFunction;
using sigrok::Error;
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),
	capture_state_(Stopped),
	cur_samplerate_(0)
{
}

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_;
}

shared_ptr<sigrok::Session> Session::session() const
{
	if (!device_)
		return shared_ptr<sigrok::Session>();
	return device_->session();
}

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

void Session::set_device(shared_ptr<devices::Device> device)
{
	assert(device);

	// Ensure we are not capturing before setting the device
	stop_capture();

	if (device_)
		device_->close();

	device_.reset();

	// Remove all stored data
	signals_.clear();
	{
		shared_lock<shared_mutex> lock(signals_mutex_);
		for (const shared_ptr<data::SignalData> d : all_signal_data_)
			d->clear();
	}
	all_signal_data_.clear();
	cur_logic_segment_.reset();

	for (auto entry : cur_analog_segments_) {
		shared_ptr<sigrok::Channel>(entry.first).reset();
		shared_ptr<data::AnalogSegment>(entry.second).reset();
	}

	logic_data_.reset();
	decode_traces_.clear();

	signals_changed();

	device_ = std::move(device);

	try {
		device_->open();
	} catch (const QString &e) {
		device_.reset();
		device_selected();
		throw;
	}

	device_->session()->add_datafeed_callback([=]
		(shared_ptr<sigrok::Device> device, shared_ptr<Packet> packet) {
			data_feed_in(device, packet);
		});

	update_signals();
	device_selected();
}

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

	if (devices.empty())
		return;

	// Try and find the demo device and select that by default
	const auto iter = std::find_if(devices.begin(), devices.end(),
		[] (const shared_ptr<devices::HardwareDevice> &d) {
			return d->hardware_device()->driver()->name() ==
			"demo";	});
	set_device((iter == devices.end()) ? devices.front() : *iter);
}

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)
{
	if (!device_) {
		error_handler(tr("No active device set, can't start acquisition."));
		return;
	}

	stop_capture();

	// Check that at least one channel is enabled
	const shared_ptr<sigrok::Device> sr_dev = device_->device();
	if (sr_dev) {
		const auto channels = sr_dev->channels();
		if (!std::any_of(channels.begin(), channels.end(),
			[](shared_ptr<Channel> channel) {
				return channel->enabled(); })) {
			error_handler(tr("No channels enabled."));
			return;
		}
	}

	// Clear signal data
	{
		shared_lock<shared_mutex> lock(signals_mutex_);
		for (const shared_ptr<data::SignalData> d : all_signal_data_)
			d->clear();
	}

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

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

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

double Session::get_samplerate() const
{
	double samplerate = 0.0;

	{
		shared_lock<shared_mutex> lock(signals_mutex_);
		for (const shared_ptr<pv::data::SignalData> d : all_signal_data_) {
			assert(d);
			const vector< shared_ptr<pv::data::Segment> > segments =
				d->segments();
			for (const shared_ptr<pv::data::Segment> &s : segments)
				samplerate = std::max(samplerate, s->samplerate());
		}
	}
	// If there is no sample rate given we use samples as unit
	if (samplerate == 0.0)
		samplerate = 1.0;

	return samplerate;
}

const unordered_set< shared_ptr<view::Signal> > Session::signals() const
{
	shared_lock<shared_mutex> lock(signals_mutex_);
	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)
{
	bool changed;

	{
		lock_guard<mutex> lock(sampling_mutex_);
		changed = capture_state_ != state;
		capture_state_ = state;
	}

	if (changed)
		capture_state_changed(state);
}

void Session::update_signals()
{
	if (!device_) {
		signals_.clear();
		logic_data_.reset();
		return;
	}

	lock_guard<recursive_mutex> lock(data_mutex_);

	const shared_ptr<sigrok::Device> sr_dev = device_->device();
	if (!sr_dev) {
		signals_.clear();
		logic_data_.reset();
		return;
	}

	// Detect what data types we will receive
	auto channels = sr_dev->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 segments
	{
		lock_guard<recursive_mutex> data_lock(data_mutex_);

		if (logic_channel_count == 0) {
			logic_data_.reset();
		} else if (!logic_data_ ||
			logic_data_->num_channels() != logic_channel_count) {
			logic_data_.reset(new data::Logic(
				logic_channel_count));
			assert(logic_data_);
		}
	}

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

		unordered_set< shared_ptr<view::Signal> > prev_sigs(signals_);
		signals_.clear();

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

			// Find the channel in the old signals
			const auto iter = std::find_if(
				prev_sigs.cbegin(), prev_sigs.cend(),
				[&](const shared_ptr<view::Signal> &s) {
					return s->channel() == channel;
				});
			if (iter != prev_sigs.end()) {
				// Copy the signal from the old set to the new
				signal = *iter;
				auto logic_signal = dynamic_pointer_cast<
					view::LogicSignal>(signal);
				if (logic_signal)
					logic_signal->set_logic_data(
						logic_data_);
			} else {
				// Create a new signal
				switch(channel->type()->id()) {
				case SR_CHANNEL_LOGIC:
					signal = shared_ptr<view::Signal>(
						new view::LogicSignal(*this,
							device_, channel,
							logic_data_));
					all_signal_data_.insert(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));
					all_signal_data_.insert(data);
					break;
				}

				default:
					assert(0);
					break;
				}
			}

			assert(signal);
			signals_.insert(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::sample_thread_proc(function<void (const QString)> error_handler)
{
	assert(error_handler);

	if (!device_)
		return;

	cur_samplerate_ = device_->read_config<uint64_t>(ConfigKey::SAMPLERATE);

	out_of_memory_ = false;

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

	set_capture_state(device_->session()->trigger() ?
		AwaitingTrigger : Running);

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

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

	if (out_of_memory_)
		error_handler(tr("Out of memory, acquisition stopped."));
}

void Session::feed_in_header()
{
	cur_samplerate_ = device_->read_config<uint64_t>(ConfigKey::SAMPLERATE);
}

void Session::feed_in_meta(shared_ptr<Meta> meta)
{
	for (auto entry : meta->config()) {
		switch (entry.first->id()) {
		case SR_CONF_SAMPLERATE:
			// We can't rely on the header to always contain the sample rate,
			// so in case it's supplied via a meta packet, we use it.
			if (!cur_samplerate_)
				cur_samplerate_ = g_variant_get_uint64(entry.second.gobj());

			/// @todo handle samplerate changes
			break;
		default:
			// Unknown metadata is not an error.
			break;
		}
	}

	signals_changed();
}

void Session::feed_in_trigger()
{
	// The channel containing most samples should be most accurate
	uint64_t sample_count = 0;

	{
		shared_lock<shared_mutex> lock(signals_mutex_);
		for (const shared_ptr<pv::data::SignalData> d : all_signal_data_) {
			assert(d);
			uint64_t temp_count = 0;

			const vector< shared_ptr<pv::data::Segment> > segments =
				d->segments();
			for (const shared_ptr<pv::data::Segment> &s : segments)
				temp_count += s->get_sample_count();

			if (temp_count > sample_count)
				sample_count = temp_count;
		}
	}

	trigger_event(sample_count / get_samplerate());
}

void Session::feed_in_frame_begin()
{
	if (cur_logic_segment_ || !cur_analog_segments_.empty())
		frame_began();
}

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

	const size_t sample_count = logic->data_length() / logic->unit_size();

	if (!logic_data_) {
		// The only reason logic_data_ would not have been created is
		// if it was not possible to determine the signals when the
		// device was created.
		update_signals();
	}

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

		// Create a new data segment
		cur_logic_segment_ = shared_ptr<data::LogicSegment>(
			new data::LogicSegment(
				logic, cur_samplerate_, sample_count));
		logic_data_->push_segment(cur_logic_segment_);

		// @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 segment
		cur_logic_segment_->append_payload(logic);
	}

	data_received();
}

void Session::feed_in_analog(shared_ptr<Analog> analog)
{
	lock_guard<recursive_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 = static_cast<const float *>(analog->data_pointer());
	bool sweep_beginning = false;

	if (signals_.empty())
		update_signals();

	for (auto channel : channels) {
		shared_ptr<data::AnalogSegment> segment;

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

			// Create a segment, keep it in the maps of channels
			segment = shared_ptr<data::AnalogSegment>(
				new data::AnalogSegment(
					cur_samplerate_, sample_count));
			cur_analog_segments_[channel] = segment;

			// Find the analog 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 segment into the analog data.
			data->push_segment(segment);
		}

		assert(segment);

		// Append the samples in the segment
		segment->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<sigrok::Device> device,
	shared_ptr<Packet> packet)
{
	(void)device;

	assert(device);
	assert(device == device_->device());
	assert(packet);

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

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

	case SR_DF_TRIGGER:
		feed_in_trigger();
		break;

	case SR_DF_FRAME_BEGIN:
		feed_in_frame_begin();
		break;

	case SR_DF_LOGIC:
		try {
			feed_in_logic(dynamic_pointer_cast<Logic>(packet->payload()));
		} catch (std::bad_alloc) {
			out_of_memory_ = true;
			device_->stop();
		}
		break;

	case SR_DF_ANALOG:
		try {
			feed_in_analog(dynamic_pointer_cast<Analog>(packet->payload()));
		} catch (std::bad_alloc) {
			out_of_memory_ = true;
			device_->stop();
		}
		break;

	case SR_DF_END:
	{
		{
			lock_guard<recursive_mutex> lock(data_mutex_);
			cur_logic_segment_.reset();
			cur_analog_segments_.clear();
		}
		frame_ended();
		break;
	}
	default:
		break;
	}
}

} // namespace pv
Commit	Line	Data
	1	/*
	2	* This file is part of the PulseView project.
	3	*
	4	* Copyright (C) 2012-14 Joel Holdsworth <joel@airwebreathe.org.uk>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#ifdef _WIN32
	22	// Windows: Avoid boost/thread namespace pollution (which includes windows.h).
	23	#define NOGDI
	24	#define NORESOURCE
	25	#endif
	26	#include <boost/thread/locks.hpp>
	27	#include <boost/thread/shared_mutex.hpp>
	28
	29	#ifdef ENABLE_DECODE
	30	#include <libsigrokdecode/libsigrokdecode.h>
	31	#endif
	32
	33	#include "session.hpp"
	34
	35	#include "devicemanager.hpp"
	36
	37	#include "data/analog.hpp"
	38	#include "data/analogsegment.hpp"
	39	#include "data/decoderstack.hpp"
	40	#include "data/logic.hpp"
	41	#include "data/logicsegment.hpp"
	42	#include "data/decode/decoder.hpp"
	43
	44	#include "devices/hardwaredevice.hpp"
	45	#include "devices/sessionfile.hpp"
	46
	47	#include "view/analogsignal.hpp"
	48	#include "view/decodetrace.hpp"
	49	#include "view/logicsignal.hpp"
	50
	51	#include <cassert>
	52	#include <mutex>
	53	#include <stdexcept>
	54
	55	#include <sys/stat.h>
	56
	57	#include <QDebug>
	58
	59	#include <libsigrokcxx/libsigrokcxx.hpp>
	60
	61	using boost::shared_lock;
	62	using boost::shared_mutex;
	63	using boost::unique_lock;
	64
	65	using std::dynamic_pointer_cast;
	66	using std::function;
	67	using std::lock_guard;
	68	using std::list;
	69	using std::map;
	70	using std::mutex;
	71	using std::recursive_mutex;
	72	using std::set;
	73	using std::shared_ptr;
	74	using std::string;
	75	using std::unordered_set;
	76	using std::vector;
	77
	78	using sigrok::Analog;
	79	using sigrok::Channel;
	80	using sigrok::ChannelType;
	81	using sigrok::ConfigKey;
	82	using sigrok::DatafeedCallbackFunction;
	83	using sigrok::Error;
	84	using sigrok::Header;
	85	using sigrok::Logic;
	86	using sigrok::Meta;
	87	using sigrok::Packet;
	88	using sigrok::PacketPayload;
	89	using sigrok::Session;
	90	using sigrok::SessionDevice;
	91
	92	using Glib::VariantBase;
	93	using Glib::Variant;
	94
	95	namespace pv {
	96	Session::Session(DeviceManager &device_manager) :
	97	device_manager_(device_manager),
	98	capture_state_(Stopped),
	99	cur_samplerate_(0)
	100	{
	101	}
	102
	103	Session::~Session()
	104	{
	105	// Stop and join to the thread
	106	stop_capture();
	107	}
	108
	109	DeviceManager& Session::device_manager()
	110	{
	111	return device_manager_;
	112	}
	113
	114	const DeviceManager& Session::device_manager() const
	115	{
	116	return device_manager_;
	117	}
	118
	119	shared_ptr<sigrok::Session> Session::session() const
	120	{
	121	if (!device_)
	122	return shared_ptr<sigrok::Session>();
	123	return device_->session();
	124	}
	125
	126	shared_ptr<devices::Device> Session::device() const
	127	{
	128	return device_;
	129	}
	130
	131	void Session::set_device(shared_ptr<devices::Device> device)
	132	{
	133	assert(device);
	134
	135	// Ensure we are not capturing before setting the device
	136	stop_capture();
	137
	138	if (device_)
	139	device_->close();
	140
	141	device_.reset();
	142
	143	// Remove all stored data
	144	signals_.clear();
	145	{
	146	shared_lock<shared_mutex> lock(signals_mutex_);
	147	for (const shared_ptr<data::SignalData> d : all_signal_data_)
	148	d->clear();
	149	}
	150	all_signal_data_.clear();
	151	cur_logic_segment_.reset();
	152
	153	for (auto entry : cur_analog_segments_) {
	154	shared_ptr<sigrok::Channel>(entry.first).reset();
	155	shared_ptr<data::AnalogSegment>(entry.second).reset();
	156	}
	157
	158	logic_data_.reset();
	159	decode_traces_.clear();
	160
	161	signals_changed();
	162
	163	device_ = std::move(device);
	164
	165	try {
	166	device_->open();
	167	} catch (const QString &e) {
	168	device_.reset();
	169	device_selected();
	170	throw;
	171	}
	172
	173	device_->session()->add_datafeed_callback([=]
	174	(shared_ptr<sigrok::Device> device, shared_ptr<Packet> packet) {
	175	data_feed_in(device, packet);
	176	});
	177
	178	update_signals();
	179	device_selected();
	180	}
	181
	182	void Session::set_default_device()
	183	{
	184	const list< shared_ptr<devices::HardwareDevice> > &devices =
	185	device_manager_.devices();
	186
	187	if (devices.empty())
	188	return;
	189
	190	// Try and find the demo device and select that by default
	191	const auto iter = std::find_if(devices.begin(), devices.end(),
	192	[] (const shared_ptr<devices::HardwareDevice> &d) {
	193	return d->hardware_device()->driver()->name() ==
	194	"demo"; });
	195	set_device((iter == devices.end()) ? devices.front() : *iter);
	196	}
	197
	198	Session::capture_state Session::get_capture_state() const
	199	{
	200	lock_guard<mutex> lock(sampling_mutex_);
	201	return capture_state_;
	202	}
	203
	204	void Session::start_capture(function<void (const QString)> error_handler)
	205	{
	206	if (!device_) {
	207	error_handler(tr("No active device set, can't start acquisition."));
	208	return;
	209	}
	210
	211	stop_capture();
	212
	213	// Check that at least one channel is enabled
	214	const shared_ptr<sigrok::Device> sr_dev = device_->device();
	215	if (sr_dev) {
	216	const auto channels = sr_dev->channels();
	217	if (!std::any_of(channels.begin(), channels.end(),
	218	[](shared_ptr<Channel> channel) {
	219	return channel->enabled(); })) {
	220	error_handler(tr("No channels enabled."));
	221	return;
	222	}
	223	}
	224
	225	// Clear signal data
	226	{
	227	shared_lock<shared_mutex> lock(signals_mutex_);
	228	for (const shared_ptr<data::SignalData> d : all_signal_data_)
	229	d->clear();
	230	}
	231
	232	// Begin the session
	233	sampling_thread_ = std::thread(
	234	&Session::sample_thread_proc, this, error_handler);
	235	}
	236
	237	void Session::stop_capture()
	238	{
	239	if (get_capture_state() != Stopped)
	240	device_->stop();
	241
	242	// Check that sampling stopped
	243	if (sampling_thread_.joinable())
	244	sampling_thread_.join();
	245	}
	246
	247	double Session::get_samplerate() const
	248	{
	249	double samplerate = 0.0;
	250
	251	{
	252	shared_lock<shared_mutex> lock(signals_mutex_);
	253	for (const shared_ptr<pv::data::SignalData> d : all_signal_data_) {
	254	assert(d);
	255	const vector< shared_ptr<pv::data::Segment> > segments =
	256	d->segments();
	257	for (const shared_ptr<pv::data::Segment> &s : segments)
	258	samplerate = std::max(samplerate, s->samplerate());
	259	}
	260	}
	261	// If there is no sample rate given we use samples as unit
	262	if (samplerate == 0.0)
	263	samplerate = 1.0;
	264
	265	return samplerate;
	266	}
	267
	268	const unordered_set< shared_ptr<view::Signal> > Session::signals() const
	269	{
	270	shared_lock<shared_mutex> lock(signals_mutex_);
	271	return signals_;
	272	}
	273
	274	#ifdef ENABLE_DECODE
	275	bool Session::add_decoder(srd_decoder *const dec)
	276	{
	277	map<const srd_channel*, shared_ptr<view::LogicSignal> > channels;
	278	shared_ptr<data::DecoderStack> decoder_stack;
	279
	280	try {
	281	lock_guard<boost::shared_mutex> lock(signals_mutex_);
	282
	283	// Create the decoder
	284	decoder_stack = shared_ptr<data::DecoderStack>(
	285	new data::DecoderStack(*this, dec));
	286
	287	// Make a list of all the channels
	288	std::vector<const srd_channel*> all_channels;
	289	for (const GSList *i = dec->channels; i; i = i->next)
	290	all_channels.push_back((const srd_channel*)i->data);
	291	for (const GSList *i = dec->opt_channels; i; i = i->next)
	292	all_channels.push_back((const srd_channel*)i->data);
	293
	294	// Auto select the initial channels
	295	for (const srd_channel *pdch : all_channels)
	296	for (shared_ptr<view::Signal> s : signals_) {
	297	shared_ptr<view::LogicSignal> l =
	298	dynamic_pointer_cast<view::LogicSignal>(s);
	299	if (l && QString::fromUtf8(pdch->name).
	300	toLower().contains(
	301	l->name().toLower()))
	302	channels[pdch] = l;
	303	}
	304
	305	assert(decoder_stack);
	306	assert(!decoder_stack->stack().empty());
	307	assert(decoder_stack->stack().front());
	308	decoder_stack->stack().front()->set_channels(channels);
	309
	310	// Create the decode signal
	311	shared_ptr<view::DecodeTrace> d(
	312	new view::DecodeTrace(*this, decoder_stack,
	313	decode_traces_.size()));
	314	decode_traces_.push_back(d);
	315	} catch (std::runtime_error e) {
	316	return false;
	317	}
	318
	319	signals_changed();
	320
	321	// Do an initial decode
	322	decoder_stack->begin_decode();
	323
	324	return true;
	325	}
	326
	327	vector< shared_ptr<view::DecodeTrace> > Session::get_decode_signals() const
	328	{
	329	shared_lock<shared_mutex> lock(signals_mutex_);
	330	return decode_traces_;
	331	}
	332
	333	void Session::remove_decode_signal(view::DecodeTrace *signal)
	334	{
	335	for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
	336	if ((*i).get() == signal) {
	337	decode_traces_.erase(i);
	338	signals_changed();
	339	return;
	340	}
	341	}
	342	#endif
	343
	344	void Session::set_capture_state(capture_state state)
	345	{
	346	bool changed;
	347
	348	{
	349	lock_guard<mutex> lock(sampling_mutex_);
	350	changed = capture_state_ != state;
	351	capture_state_ = state;
	352	}
	353
	354	if (changed)
	355	capture_state_changed(state);
	356	}
	357
	358	void Session::update_signals()
	359	{
	360	if (!device_) {
	361	signals_.clear();
	362	logic_data_.reset();
	363	return;
	364	}
	365
	366	lock_guard<recursive_mutex> lock(data_mutex_);
	367
	368	const shared_ptr<sigrok::Device> sr_dev = device_->device();
	369	if (!sr_dev) {
	370	signals_.clear();
	371	logic_data_.reset();
	372	return;
	373	}
	374
	375	// Detect what data types we will receive
	376	auto channels = sr_dev->channels();
	377	unsigned int logic_channel_count = std::count_if(
	378	channels.begin(), channels.end(),
	379	[] (shared_ptr<Channel> channel) {
	380	return channel->type() == ChannelType::LOGIC; });
	381
	382	// Create data containers for the logic data segments
	383	{
	384	lock_guard<recursive_mutex> data_lock(data_mutex_);
	385
	386	if (logic_channel_count == 0) {
	387	logic_data_.reset();
	388	} else if (!logic_data_ \|\|
	389	logic_data_->num_channels() != logic_channel_count) {
	390	logic_data_.reset(new data::Logic(
	391	logic_channel_count));
	392	assert(logic_data_);
	393	}
	394	}
	395
	396	// Make the Signals list
	397	{
	398	unique_lock<shared_mutex> lock(signals_mutex_);
	399
	400	unordered_set< shared_ptr<view::Signal> > prev_sigs(signals_);
	401	signals_.clear();
	402
	403	for (auto channel : sr_dev->channels()) {
	404	shared_ptr<view::Signal> signal;
	405
	406	// Find the channel in the old signals
	407	const auto iter = std::find_if(
	408	prev_sigs.cbegin(), prev_sigs.cend(),
	409	[&](const shared_ptr<view::Signal> &s) {
	410	return s->channel() == channel;
	411	});
	412	if (iter != prev_sigs.end()) {
	413	// Copy the signal from the old set to the new
	414	signal = *iter;
	415	auto logic_signal = dynamic_pointer_cast<
	416	view::LogicSignal>(signal);
	417	if (logic_signal)
	418	logic_signal->set_logic_data(
	419	logic_data_);
	420	} else {
	421	// Create a new signal
	422	switch(channel->type()->id()) {
	423	case SR_CHANNEL_LOGIC:
	424	signal = shared_ptr<view::Signal>(
	425	new view::LogicSignal(*this,
	426	device_, channel,
	427	logic_data_));
	428	all_signal_data_.insert(logic_data_);
	429	break;
	430
	431	case SR_CHANNEL_ANALOG:
	432	{
	433	shared_ptr<data::Analog> data(
	434	new data::Analog());
	435	signal = shared_ptr<view::Signal>(
	436	new view::AnalogSignal(
	437	*this, channel, data));
	438	all_signal_data_.insert(data);
	439	break;
	440	}
	441
	442	default:
	443	assert(0);
	444	break;
	445	}
	446	}
	447
	448	assert(signal);
	449	signals_.insert(signal);
	450	}
	451	}
	452
	453	signals_changed();
	454	}
	455
	456	shared_ptr<view::Signal> Session::signal_from_channel(
	457	shared_ptr<Channel> channel) const
	458	{
	459	lock_guard<boost::shared_mutex> lock(signals_mutex_);
	460	for (shared_ptr<view::Signal> sig : signals_) {
	461	assert(sig);
	462	if (sig->channel() == channel)
	463	return sig;
	464	}
	465	return shared_ptr<view::Signal>();
	466	}
	467
	468	void Session::sample_thread_proc(function<void (const QString)> error_handler)
	469	{
	470	assert(error_handler);
	471
	472	if (!device_)
	473	return;
	474
	475	cur_samplerate_ = device_->read_config<uint64_t>(ConfigKey::SAMPLERATE);
	476
	477	out_of_memory_ = false;
	478
	479	try {
	480	device_->start();
	481	} catch (Error e) {
	482	error_handler(e.what());
	483	return;
	484	}
	485
	486	set_capture_state(device_->session()->trigger() ?
	487	AwaitingTrigger : Running);
	488
	489	device_->run();
	490	set_capture_state(Stopped);
	491
	492	// Confirm that SR_DF_END was received
	493	if (cur_logic_segment_) {
	494	qDebug("SR_DF_END was not received.");
	495	assert(0);
	496	}
	497
	498	if (out_of_memory_)
	499	error_handler(tr("Out of memory, acquisition stopped."));
	500	}
	501
	502	void Session::feed_in_header()
	503	{
	504	cur_samplerate_ = device_->read_config<uint64_t>(ConfigKey::SAMPLERATE);
	505	}
	506
	507	void Session::feed_in_meta(shared_ptr<Meta> meta)
	508	{
	509	for (auto entry : meta->config()) {
	510	switch (entry.first->id()) {
	511	case SR_CONF_SAMPLERATE:
	512	// We can't rely on the header to always contain the sample rate,
	513	// so in case it's supplied via a meta packet, we use it.
	514	if (!cur_samplerate_)
	515	cur_samplerate_ = g_variant_get_uint64(entry.second.gobj());
	516
	517	/// @todo handle samplerate changes
	518	break;
	519	default:
	520	// Unknown metadata is not an error.
	521	break;
	522	}
	523	}
	524
	525	signals_changed();
	526	}
	527
	528	void Session::feed_in_trigger()
	529	{
	530	// The channel containing most samples should be most accurate
	531	uint64_t sample_count = 0;
	532
	533	{
	534	shared_lock<shared_mutex> lock(signals_mutex_);
	535	for (const shared_ptr<pv::data::SignalData> d : all_signal_data_) {
	536	assert(d);
	537	uint64_t temp_count = 0;
	538
	539	const vector< shared_ptr<pv::data::Segment> > segments =
	540	d->segments();
	541	for (const shared_ptr<pv::data::Segment> &s : segments)
	542	temp_count += s->get_sample_count();
	543
	544	if (temp_count > sample_count)
	545	sample_count = temp_count;
	546	}
	547	}
	548
	549	trigger_event(sample_count / get_samplerate());
	550	}
	551
	552	void Session::feed_in_frame_begin()
	553	{
	554	if (cur_logic_segment_ \|\| !cur_analog_segments_.empty())
	555	frame_began();
	556	}
	557
	558	void Session::feed_in_logic(shared_ptr<Logic> logic)
	559	{
	560	lock_guard<recursive_mutex> lock(data_mutex_);
	561
	562	const size_t sample_count = logic->data_length() / logic->unit_size();
	563
	564	if (!logic_data_) {
	565	// The only reason logic_data_ would not have been created is
	566	// if it was not possible to determine the signals when the
	567	// device was created.
	568	update_signals();
	569	}
	570
	571	if (!cur_logic_segment_) {
	572	// This could be the first packet after a trigger
	573	set_capture_state(Running);
	574
	575	// Create a new data segment
	576	cur_logic_segment_ = shared_ptr<data::LogicSegment>(
	577	new data::LogicSegment(
	578	logic, cur_samplerate_, sample_count));
	579	logic_data_->push_segment(cur_logic_segment_);
	580
	581	// @todo Putting this here means that only listeners querying
	582	// for logic will be notified. Currently the only user of
	583	// frame_began is DecoderStack, but in future we need to signal
	584	// this after both analog and logic sweeps have begun.
	585	frame_began();
	586	} else {
	587	// Append to the existing data segment
	588	cur_logic_segment_->append_payload(logic);
	589	}
	590
	591	data_received();
	592	}
	593
	594	void Session::feed_in_analog(shared_ptr<Analog> analog)
	595	{
	596	lock_guard<recursive_mutex> lock(data_mutex_);
	597
	598	const vector<shared_ptr<Channel>> channels = analog->channels();
	599	const unsigned int channel_count = channels.size();
	600	const size_t sample_count = analog->num_samples() / channel_count;
	601	const float data = static_cast<const float >(analog->data_pointer());
	602	bool sweep_beginning = false;
	603
	604	if (signals_.empty())
	605	update_signals();
	606
	607	for (auto channel : channels) {
	608	shared_ptr<data::AnalogSegment> segment;
	609
	610	// Try to get the segment of the channel
	611	const map< shared_ptr<Channel>, shared_ptr<data::AnalogSegment> >::
	612	iterator iter = cur_analog_segments_.find(channel);
	613	if (iter != cur_analog_segments_.end())
	614	segment = (*iter).second;
	615	else {
	616	// If no segment was found, this means we haven't
	617	// created one yet. i.e. this is the first packet
	618	// in the sweep containing this segment.
	619	sweep_beginning = true;
	620
	621	// Create a segment, keep it in the maps of channels
	622	segment = shared_ptr<data::AnalogSegment>(
	623	new data::AnalogSegment(
	624	cur_samplerate_, sample_count));
	625	cur_analog_segments_[channel] = segment;
	626
	627	// Find the analog data associated with the channel
	628	shared_ptr<view::AnalogSignal> sig =
	629	dynamic_pointer_cast<view::AnalogSignal>(
	630	signal_from_channel(channel));
	631	assert(sig);
	632
	633	shared_ptr<data::Analog> data(sig->analog_data());
	634	assert(data);
	635
	636	// Push the segment into the analog data.
	637	data->push_segment(segment);
	638	}
	639
	640	assert(segment);
	641
	642	// Append the samples in the segment
	643	segment->append_interleaved_samples(data++, sample_count,
	644	channel_count);
	645	}
	646
	647	if (sweep_beginning) {
	648	// This could be the first packet after a trigger
	649	set_capture_state(Running);
	650	}
	651
	652	data_received();
	653	}
	654
	655	void Session::data_feed_in(shared_ptr<sigrok::Device> device,
	656	shared_ptr<Packet> packet)
	657	{
	658	(void)device;
	659
	660	assert(device);
	661	assert(device == device_->device());
	662	assert(packet);
	663
	664	switch (packet->type()->id()) {
	665	case SR_DF_HEADER:
	666	feed_in_header();
	667	break;
	668
	669	case SR_DF_META:
	670	feed_in_meta(dynamic_pointer_cast<Meta>(packet->payload()));
	671	break;
	672
	673	case SR_DF_TRIGGER:
	674	feed_in_trigger();
	675	break;
	676
	677	case SR_DF_FRAME_BEGIN:
	678	feed_in_frame_begin();
	679	break;
	680
	681	case SR_DF_LOGIC:
	682	try {
	683	feed_in_logic(dynamic_pointer_cast<Logic>(packet->payload()));
	684	} catch (std::bad_alloc) {
	685	out_of_memory_ = true;
	686	device_->stop();
	687	}
	688	break;
	689
	690	case SR_DF_ANALOG:
	691	try {
	692	feed_in_analog(dynamic_pointer_cast<Analog>(packet->payload()));
	693	} catch (std::bad_alloc) {
	694	out_of_memory_ = true;
	695	device_->stop();
	696	}
	697	break;
	698
	699	case SR_DF_END:
	700	{
	701	{
	702	lock_guard<recursive_mutex> lock(data_mutex_);
	703	cur_logic_segment_.reset();
	704	cur_analog_segments_.clear();
	705	}
	706	frame_ended();
	707	break;
	708	}
	709	default:
	710	break;
	711	}
	712	}
	713
	714	} // namespace pv