Create signals when device is selected

[pulseview.git] / pv / sigsession.cpp

/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2012 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
 */

#include "sigsession.h"

#include "devicemanager.h"
#include "data/analog.h"
#include "data/analogsnapshot.h"
#include "data/logic.h"
#include "data/logicsnapshot.h"
#include "view/analogsignal.h"
#include "view/logicsignal.h"

#include <assert.h>

#include <sys/stat.h>

#include <QDebug>

using namespace boost;
using namespace std;

namespace pv {

// TODO: This should not be necessary
SigSession* SigSession::_session = NULL;

SigSession::SigSession(DeviceManager &device_manager) :
	_device_manager(device_manager),
	_sdi(NULL),
	_capture_state(Stopped)
{
	// TODO: This should not be necessary
	_session = this;
}

SigSession::~SigSession()
{
	stop_capture();

	if (_sampling_thread.get())
		_sampling_thread->join();
	_sampling_thread.reset();

	if (_sdi)
		_device_manager.release_device(_sdi);
	_sdi = NULL;

	// TODO: This should not be necessary
	_session = NULL;
}

struct sr_dev_inst* SigSession::get_device() const
{
	return _sdi;
}

void SigSession::set_device(struct sr_dev_inst *sdi)
{
	if (_sdi)
		_device_manager.release_device(_sdi);
	if (sdi)
		_device_manager.use_device(sdi, this);
	_sdi = sdi;
	update_signals();
}

void SigSession::release_device(struct sr_dev_inst *sdi)
{
	(void)sdi;

	assert(_capture_state == Stopped);
	_sdi = NULL;
	update_signals();
}

void SigSession::load_file(const string &name,
	function<void (const QString)> error_handler)
{
	stop_capture();
	_sampling_thread.reset(new boost::thread(
		&SigSession::load_thread_proc, this, name,
		error_handler));
}

SigSession::capture_state SigSession::get_capture_state() const
{
	lock_guard<mutex> lock(_sampling_mutex);
	return _capture_state;
}

void SigSession::start_capture(uint64_t record_length,
	function<void (const QString)> error_handler)
{
	stop_capture();

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

	// Check that at least one probe is enabled
	const GSList *l;
	for (l = _sdi->probes; l; l = l->next) {
		sr_probe *const probe = (sr_probe*)l->data;
		assert(probe);
		if (probe->enabled)
			break;
	}

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

	// Begin the session
	_sampling_thread.reset(new boost::thread(
		&SigSession::sample_thread_proc, this, _sdi,
		record_length, error_handler));
}

void SigSession::stop_capture()
{
	if (get_capture_state() == Stopped)
		return;

	sr_session_stop();

	// Check that sampling stopped
	if (_sampling_thread.get())
		_sampling_thread->join();
	_sampling_thread.reset();
}

vector< shared_ptr<view::Signal> > SigSession::get_signals()
{
	lock_guard<mutex> lock(_signals_mutex);
	return _signals;
}

boost::shared_ptr<data::Logic> SigSession::get_data()
{
	return _logic_data;
}

void SigSession::set_capture_state(capture_state state)
{
	lock_guard<mutex> lock(_sampling_mutex);
	_capture_state = state;
	capture_state_changed(state);
}

/**
 * Attempts to autodetect the format. Failing that
 * @param filename The filename of the input file.
 * @return A pointer to the 'struct sr_input_format' that should be used,
 *         or NULL if no input format was selected or auto-detected.
 */
sr_input_format* SigSession::determine_input_file_format(
	const string &filename)
{
	int i;

	/* If there are no input formats, return NULL right away. */
	sr_input_format *const *const inputs = sr_input_list();
	if (!inputs) {
		g_critical("No supported input formats available.");
		return NULL;
	}

	/* Otherwise, try to find an input module that can handle this file. */
	for (i = 0; inputs[i]; i++) {
		if (inputs[i]->format_match(filename.c_str()))
			break;
	}

	/* Return NULL if no input module wanted to touch this. */
	if (!inputs[i]) {
		g_critical("Error: no matching input module found.");
		return NULL;
	}

	return inputs[i];
}

sr_input* SigSession::load_input_file_format(const string &filename,
	function<void (const QString)> error_handler,
	sr_input_format *format)
{
	struct stat st;
	sr_input *in;

	if (!format && !(format =
		determine_input_file_format(filename.c_str()))) {
		/* The exact cause was already logged. */
		return NULL;
	}

	if (stat(filename.c_str(), &st) == -1) {
		error_handler(tr("Failed to load file"));
		return NULL;
	}

	/* Initialize the input module. */
	if (!(in = new sr_input)) {
		qDebug("Failed to allocate input module.\n");
		return NULL;
	}

	in->format = format;
	in->param = NULL;
	if (in->format->init &&
		in->format->init(in, filename.c_str()) != SR_OK) {
		qDebug("Input format init failed.\n");
		return NULL;
	}

	sr_session_new();

	if (sr_session_dev_add(in->sdi) != SR_OK) {
		qDebug("Failed to use device.\n");
		sr_session_destroy();
		return NULL;
	}

	return in;
}

void SigSession::update_signals()
{
	assert(_capture_state == Stopped);

	shared_ptr<view::Signal> signal;
	unsigned int logic_probe_count = 0;
	unsigned int analog_probe_count = 0;

	// Detect what data types we will receive
	if(_sdi) {
		for (const GSList *l = _sdi->probes; l; l = l->next) {
			const sr_probe *const probe = (const sr_probe *)l->data;
			if (!probe->enabled)
				continue;

			switch(probe->type) {
			case SR_PROBE_LOGIC:
				logic_probe_count++;
				break;

			case SR_PROBE_ANALOG:
				analog_probe_count++;
				break;
			}
		}
	}

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

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

		_analog_data.reset();
		if (analog_probe_count != 0) {
			_analog_data.reset(new data::Analog());
			assert(_analog_data);
		}
	}

	// Make the Signals list
	{
		lock_guard<mutex> lock(_signals_mutex);

		_signals.clear();

		if(_sdi) {
			for (const GSList *l = _sdi->probes; l; l = l->next) {
				const sr_probe *const probe =
					(const sr_probe *)l->data;
				assert(probe);
				if (!probe->enabled)
					continue;

				switch(probe->type) {
				case SR_PROBE_LOGIC:
					signal = shared_ptr<view::Signal>(
						new view::LogicSignal(
							probe->name,
							_logic_data,
							probe->index));
					break;

				case SR_PROBE_ANALOG:
					signal = shared_ptr<view::Signal>(
						new view::AnalogSignal(
							probe->name,
							_analog_data,
							probe->index));
					break;
				}

				_signals.push_back(signal);
			}
		}
	}

	signals_changed();
}

void SigSession::load_thread_proc(const string name,
	function<void (const QString)> error_handler)
{
	sr_input *in = NULL;

	if (sr_session_load(name.c_str()) == SR_OK) {
		if (sr_session_start() != SR_OK) {
			error_handler(tr("Failed to start session."));
			return;
		}
	}
	else if(!(in = load_input_file_format(name.c_str(), error_handler)))
		return;

	sr_session_datafeed_callback_add(data_feed_in_proc, NULL);

	set_capture_state(Running);

	if(in) {
		assert(in->format);
		in->format->loadfile(in, name.c_str());
	} else
		sr_session_run();

	sr_session_destroy();
	set_capture_state(Stopped);

	// Confirm that SR_DF_END was received
	assert(!_cur_logic_snapshot);
	assert(!_cur_analog_snapshot);

	delete in;
}

void SigSession::sample_thread_proc(struct sr_dev_inst *sdi,
	uint64_t record_length,
	function<void (const QString)> error_handler)
{
	assert(sdi);
	assert(error_handler);

	sr_session_new();
	sr_session_datafeed_callback_add(data_feed_in_proc, NULL);

	if (sr_session_dev_add(sdi) != SR_OK) {
		error_handler(tr("Failed to use device."));
		sr_session_destroy();
		return;
	}

	// Set the sample limit
	if (sr_config_set(sdi, SR_CONF_LIMIT_SAMPLES,
		g_variant_new_uint64(record_length)) != SR_OK) {
		error_handler(tr("Failed to configure "
			"time-based sample limit."));
		sr_session_destroy();
		return;
	}

	if (sr_session_start() != SR_OK) {
		error_handler(tr("Failed to start session."));
		return;
	}

	set_capture_state(Running);

	sr_session_run();
	sr_session_destroy();

	set_capture_state(Stopped);

	// Confirm that SR_DF_END was received
	assert(!_cur_logic_snapshot);
	assert(!_cur_analog_snapshot);
}

void SigSession::feed_in_header(const sr_dev_inst *sdi)
{
	GVariant *gvar;
	uint64_t sample_rate = 0;

	// Read out the sample rate
	if(sdi->driver)
	{
		const int ret = sr_config_get(sdi->driver,
			SR_CONF_SAMPLERATE, &gvar, sdi);
		if (ret != SR_OK) {
			qDebug("Failed to get samplerate\n");
			return;
		}

		sample_rate = g_variant_get_uint64(gvar);
		g_variant_unref(gvar);
	}

	if(_analog_data)
		_analog_data->set_samplerate(sample_rate);
	if(_logic_data)
		_logic_data->set_samplerate(sample_rate);
}

void SigSession::feed_in_meta(const sr_dev_inst *sdi,
	const sr_datafeed_meta &meta)
{
	(void)sdi;

	for (const GSList *l = meta.config; l; l = l->next) {
		const sr_config *const src = (const sr_config*)l->data;
		switch (src->key) {
		case SR_CONF_SAMPLERATE:
			/// @todo handle samplerate changes
			/// samplerate = (uint64_t *)src->value;
			break;
		default:
			// Unknown metadata is not an error.
			break;
		}
	}
}

void SigSession::feed_in_logic(const sr_datafeed_logic &logic)
{
	lock_guard<mutex> lock(_data_mutex);

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

	if (!_cur_logic_snapshot)
	{
		// Create a new data snapshot
		_cur_logic_snapshot = shared_ptr<data::LogicSnapshot>(
			new data::LogicSnapshot(logic));
		_logic_data->push_snapshot(_cur_logic_snapshot);
	}
	else
	{
		// Append to the existing data snapshot
		_cur_logic_snapshot->append_payload(logic);
	}

	data_updated();
}

void SigSession::feed_in_analog(const sr_datafeed_analog &analog)
{
	lock_guard<mutex> lock(_data_mutex);

	if(!_analog_data)
	{
		qDebug() << "Unexpected analog packet";
		return;	// This analog packet was not expected.
	}

	if (!_cur_analog_snapshot)
	{
		// Create a new data snapshot
		_cur_analog_snapshot = shared_ptr<data::AnalogSnapshot>(
			new data::AnalogSnapshot(analog));
		_analog_data->push_snapshot(_cur_analog_snapshot);
	}
	else
	{
		// Append to the existing data snapshot
		_cur_analog_snapshot->append_payload(analog);
	}

	data_updated();
}

void SigSession::data_feed_in(const struct sr_dev_inst *sdi,
	const struct sr_datafeed_packet *packet)
{
	assert(sdi);
	assert(packet);

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

	case SR_DF_META:
		assert(packet->payload);
		feed_in_meta(sdi,
			*(const sr_datafeed_meta*)packet->payload);
		break;

	case SR_DF_LOGIC:
		assert(packet->payload);
		feed_in_logic(*(const sr_datafeed_logic*)packet->payload);
		break;

	case SR_DF_ANALOG:
		assert(packet->payload);
		feed_in_analog(*(const sr_datafeed_analog*)packet->payload);
		break;

	case SR_DF_END:
	{
		{
			lock_guard<mutex> lock(_data_mutex);
			_cur_logic_snapshot.reset();
			_cur_analog_snapshot.reset();
		}
		data_updated();
		break;
	}
	}
}

void SigSession::data_feed_in_proc(const struct sr_dev_inst *sdi,
	const struct sr_datafeed_packet *packet, void *cb_data)
{
	(void) cb_data;
	assert(_session);
	_session->data_feed_in(sdi, packet);
}

} // namespace pv