#include <vector>
#include <cmath>
#include <fstream>
#include <map>

#include <glibmm.h>
#include <gtkmm/messagedialog.h>
#include <pbd/xml++.h>

#ifdef __APPLE__
#include <CoreAudio/CoreAudio.h>
#include <CoreFoundation/CFString.h>
#include <sys/param.h>
#include <mach-o/dyld.h>
#else
#include <alsa/asoundlib.h>
#endif

#include <ardour/profile.h>
#include <jack/jack.h>

#include <gtkmm/stock.h>
#include <gtkmm2ext/utils.h>

#include <pbd/convert.h>
#include <pbd/error.h>
#include <pbd/pathscanner.h>

#ifdef __APPLE
#include <CFBundle.h>
#endif

#include "engine_dialog.h"
#include "i18n.h"

using namespace std;
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace PBD;
using namespace Glib;

EngineControl::EngineControl ()
	: periods_adjustment (2, 2, 16, 1, 2),
	  periods_spinner (periods_adjustment),
	  priority_adjustment (60, 10, 90, 1, 10),
	  priority_spinner (priority_adjustment),
	  ports_adjustment (128, 8, 1024, 1, 16),
	  ports_spinner (ports_adjustment),
	  realtime_button (_("Realtime")),
	  no_memory_lock_button (_("Do not lock memory")),
	  unlock_memory_button (_("Unlock memory")),
	  soft_mode_button (_("No zombies")),
	  monitor_button (_("Provide monitor ports")),
	  force16bit_button (_("Force 16 bit")),
	  hw_monitor_button (_("H/W monitoring")),
	  hw_meter_button (_("H/W metering")),
	  verbose_output_button (_("Verbose output")),
	  start_button (_("Start")),
	  stop_button (_("Stop")),
#ifdef __APPLE__
	  basic_packer (5, 2),
	  options_packer (4, 2),
	  device_packer (4, 2)
#else
	  basic_packer (8, 2),
	  options_packer (14, 2),
	  device_packer (6, 2)
#endif	  
{
	using namespace Notebook_Helpers;
	Label* label;
	vector<string> strings;
	int row = 0;

	_used = false;

	strings.push_back (_("8000Hz"));
	strings.push_back (_("22050Hz"));
	strings.push_back (_("44100Hz"));
	strings.push_back (_("48000Hz"));
	strings.push_back (_("88200Hz"));
	strings.push_back (_("96000Hz"));
	strings.push_back (_("192000Hz"));
	set_popdown_strings (sample_rate_combo, strings);
	sample_rate_combo.set_active_text ("48000Hz");

	strings.clear ();
	strings.push_back ("32");
	strings.push_back ("64");
	strings.push_back ("128");
	strings.push_back ("256");
	strings.push_back ("512");
	strings.push_back ("1024");
	strings.push_back ("2048");
	strings.push_back ("4096");
	strings.push_back ("8192");
	set_popdown_strings (period_size_combo, strings);
	period_size_combo.set_active_text ("1024");

	strings.clear ();
	strings.push_back (_("None"));
	strings.push_back (_("Triangular"));
	strings.push_back (_("Rectangular"));
	strings.push_back (_("Shaped"));
	set_popdown_strings (dither_mode_combo, strings);
	dither_mode_combo.set_active_text (_("None"));

	/* basic parameters */

	basic_packer.set_spacings (6);

	strings.clear ();
#ifdef __APPLE__
	strings.push_back (X_("CoreAudio"));
#else
	strings.push_back (X_("ALSA"));
	strings.push_back (X_("OSS"));
	strings.push_back (X_("FFADO"));
#endif
	strings.push_back (X_("NetJACK"));
	strings.push_back (X_("Dummy"));
	set_popdown_strings (driver_combo, strings);
	driver_combo.set_active_text (strings.front());

	driver_combo.signal_changed().connect (mem_fun (*this, &EngineControl::driver_changed));
	driver_changed ();

	strings.clear ();
	strings.push_back (_("Playback/Recording on 1 Device"));
	strings.push_back (_("Playback/Recording on 2 Devices"));
	strings.push_back (_("Playback only"));
	strings.push_back (_("Recording only"));
	set_popdown_strings (audio_mode_combo, strings);
	audio_mode_combo.set_active_text (strings.front());

	audio_mode_combo.signal_changed().connect (mem_fun (*this, &EngineControl::audio_mode_changed));
	audio_mode_changed ();

	row = 0;

	label = manage (new Label (_("Driver")));
	basic_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	basic_packer.attach (driver_combo, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	row++;

	label = manage (new Label (_("Interface")));
	basic_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	basic_packer.attach (interface_combo, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	row++;

	label = manage (new Label (_("Sample Rate")));
	basic_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	basic_packer.attach (sample_rate_combo, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	row++;

	label = manage (new Label (_("Buffer size")));
	basic_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	basic_packer.attach (period_size_combo, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	row++;

#ifndef __APPLE__
	label = manage (new Label (_("Number of buffers")));
	basic_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	basic_packer.attach (periods_spinner, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	periods_spinner.set_value (2);
	row++;
#endif

	label = manage (new Label (_("Approximate latency")));
	label->set_alignment (0.0, 0.5);
	basic_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	basic_packer.attach (latency_label, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	row++;

	sample_rate_combo.signal_changed().connect (mem_fun (*this, &EngineControl::redisplay_latency));
	periods_adjustment.signal_value_changed().connect (mem_fun (*this, &EngineControl::redisplay_latency));
	period_size_combo.signal_changed().connect (mem_fun (*this, &EngineControl::redisplay_latency));
	redisplay_latency();
	row++;
	/* no audio mode with CoreAudio, its duplex or nuthin' */

#ifndef __APPLE__
	label = manage (new Label (_("Audio Mode")));
	basic_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	basic_packer.attach (audio_mode_combo, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	row++;
#endif

	interface_combo.set_size_request (125, -1);
	input_device_combo.set_size_request (125, -1);
	output_device_combo.set_size_request (125, -1);

	/*

	if (engine_running()) {
		start_button.set_sensitive (false);
	} else {
		stop_button.set_sensitive (false);
	}

	start_button.signal_clicked().connect (mem_fun (*this, &EngineControl::start_engine));
	stop_button.signal_clicked().connect (mem_fun (*this, &EngineControl::start_engine));
	*/

	button_box.pack_start (start_button, false, false);
	button_box.pack_start (stop_button, false, false);

	// basic_packer.attach (button_box, 0, 2, 8, 9, FILL|EXPAND, (AttachOptions) 0);

	/* options */

	options_packer.set_spacings (6);
	row = 0;

	options_packer.attach (realtime_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;

	realtime_button.signal_toggled().connect (mem_fun (*this, &EngineControl::realtime_changed));
	realtime_changed ();

#ifndef __APPLE__
	label = manage (new Label (_("Realtime Priority")));
	label->set_alignment (1.0, 0.5);
	options_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	options_packer.attach (priority_spinner, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	priority_spinner.set_value (60);

	options_packer.attach (no_memory_lock_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	options_packer.attach (unlock_memory_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	options_packer.attach (soft_mode_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	options_packer.attach (monitor_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	options_packer.attach (force16bit_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	options_packer.attach (hw_monitor_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	options_packer.attach (hw_meter_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	options_packer.attach (verbose_output_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
#else 
	options_packer.attach (verbose_output_button, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
#endif

	strings.clear ();
	strings.push_back (_("Ignore"));
	strings.push_back ("500 msec");
	strings.push_back ("1 sec");
	strings.push_back ("2 sec");
	strings.push_back ("10 sec");
	set_popdown_strings (timeout_combo, strings);
	timeout_combo.set_active_text (strings.front ());

	label = manage (new Label (_("Client timeout")));
	label->set_alignment (1.0, 0.5);
	options_packer.attach (timeout_combo, 1, 2, row, row + 1, FILL|EXPAND, AttachOptions(0));
	options_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;

	label = manage (new Label (_("Number of ports")));
	label->set_alignment (1.0, 0.5);
	options_packer.attach (ports_spinner, 1, 2, row, row + 1, FILL|EXPAND, AttachOptions(0));
	options_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;

#ifndef __APPLE__
	label = manage (new Label (_("Dither")));	
	label->set_alignment (1.0, 0.5);
	options_packer.attach (dither_mode_combo, 1, 2, row, row + 1, FILL|EXPAND, AttachOptions(0));
	options_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
	++row;
#endif

	find_jack_servers (server_strings);

	if (server_strings.empty()) {
		fatal << _("No JACK server found anywhere on this system. Please install JACK and restart") << endmsg;
		/*NOTREACHED*/
	}
	
	set_popdown_strings (serverpath_combo, server_strings);
	serverpath_combo.set_active_text (server_strings.front());

	if (server_strings.size() > 1) {
		label = manage (new Label (_("Server:")));
		options_packer.attach (*label, 0, 1, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
		label->set_alignment (0.0, 0.5);
		options_packer.attach (serverpath_combo, 1, 2, row, row + 1, FILL|EXPAND, (AttachOptions) 0);
		++row;
	}

	/* device settings */

	device_packer.set_spacings (6);
	row = 0;

#ifndef __APPLE__
	label = manage (new Label (_("Input device")));
	label->set_alignment (1.0, 0.5);
	device_packer.attach (*label, 0, 1, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	device_packer.attach (input_device_combo, 1, 2, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	label = manage (new Label (_("Output device")));
	label->set_alignment (1.0, 0.5);
	device_packer.attach (*label, 0, 1, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	device_packer.attach (output_device_combo, 1, 2, row, row+1, FILL|EXPAND, (AttachOptions) 0);	
	++row;
#endif
	label = manage (new Label (_("Input channels")));
	label->set_alignment (1.0, 0.5);
	device_packer.attach (*label, 0, 1, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	device_packer.attach (input_channels, 1, 2, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	label = manage (new Label (_("Output channels")));
	label->set_alignment (1.0, 0.5);
	device_packer.attach (*label, 0, 1, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	device_packer.attach (output_channels, 1, 2, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	label = manage (new Label (_("Hardware input latency (samples)")));
	label->set_alignment (1.0, 0.5);
	device_packer.attach (*label, 0, 1, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	device_packer.attach (input_latency, 1, 2, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	++row;
	label = manage (new Label (_("Hardware output latency (samples)")));
	label->set_alignment (1.0, 0.5);
	device_packer.attach (*label, 0, 1, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	device_packer.attach (output_latency, 1, 2, row, row+1, FILL|EXPAND, (AttachOptions) 0);
	++row;

	basic_hbox.pack_start (basic_packer, false, false);
	options_hbox.pack_start (options_packer, false, false);

	device_packer.set_border_width (12);
	options_packer.set_border_width (12);
	basic_packer.set_border_width (12);

	notebook.pages().push_back (TabElem (basic_hbox, _("Device")));
	notebook.pages().push_back (TabElem (options_hbox, _("Options")));
	notebook.pages().push_back (TabElem (device_packer, _("Advanced")));
	notebook.set_border_width (12);

	set_border_width (12);
	pack_start (notebook);
}

EngineControl::~EngineControl ()
{

}

void
EngineControl::build_command_line (vector<string>& cmd)
{
	string str;
	string driver;
	bool using_oss = false;
	bool using_alsa = false;
	bool using_coreaudio = false;
	bool using_netjack = false;
	bool using_ffado = false;
	bool using_dummy = false;

	/* first, path to jackd */

	cmd.push_back (serverpath_combo.get_active_text ());
	
	/* now jackd arguments */

	str = timeout_combo.get_active_text ();
	if (str != _("Ignore")) {
		double secs;
		uint32_t msecs;
		atof (str);
		msecs = (uint32_t) floor (secs * 1000.0);
		cmd.push_back ("-t");
		cmd.push_back (to_string (msecs, std::dec));
	}

	if (no_memory_lock_button.get_active()) {
		cmd.push_back ("-m"); /* no munlock */
	}
	
	cmd.push_back ("-p"); /* port max */
	cmd.push_back (to_string ((uint32_t) floor (ports_spinner.get_value()), std::dec));

	if (realtime_button.get_active()) {
		cmd.push_back ("-R");
		cmd.push_back ("-P");
		cmd.push_back (to_string ((uint32_t) floor (priority_spinner.get_value()), std::dec));
	}

	if (unlock_memory_button.get_active()) {
		cmd.push_back ("-u");
	}

	if (verbose_output_button.get_active()) {
		cmd.push_back ("-v");
	}
	
	/* now add fixed arguments (not user-selectable) */

	cmd.push_back ("-T"); // temporary */

	/* next the driver */

	cmd.push_back ("-d");

	driver = driver_combo.get_active_text ();
	if (driver == X_("ALSA")) {
		using_alsa = true;
		cmd.push_back ("alsa");
	} else if (driver == X_("OSS")) {
		using_oss = true;
		cmd.push_back ("oss");
	} else if (driver == X_("CoreAudio")) {
		using_coreaudio = true;
		cmd.push_back ("coreaudio");
	} else if (driver == X_("NetJACK")) {
		using_netjack = true;
		cmd.push_back ("netjack");
	} else if (driver == X_("FFADO")) {
		using_ffado = true;

		/* do this until FFADO becomes the standard */

		char* hack = getenv ("ARDOUR_FIREWIRE_DRIVER_NAME");

		if (hack) {
			cmd.push_back (hack);
		} else {
			cmd.push_back ("freebob");
		}

	} else if ( driver == X_("Dummy")) {
		using_dummy = true;
		cmd.push_back ("dummy");
	}

	/* driver arguments */

	if (!using_coreaudio) {
		str = audio_mode_combo.get_active_text();
		
		if (str == _("Playback/Recording on 1 Device")) {
			
			/* relax */
			
		} else if (str == _("Playback/Recording on 2 Devices")) {
			
			cmd.push_back ("-C");
			cmd.push_back (get_device_name (driver, input_device_combo.get_active_text()));
			cmd.push_back ("-P");
			cmd.push_back (get_device_name (driver, output_device_combo.get_active_text()));
			
		} else if (str == _("Playback only")) {
			cmd.push_back ("-P");
		} else if (str == _("Recording only")) {
			cmd.push_back ("-C");
		}

		if (! using_dummy ) {
			cmd.push_back ("-n");
			cmd.push_back (to_string ((uint32_t) floor (periods_spinner.get_value()), std::dec));
		}
	}

	cmd.push_back ("-r");
	cmd.push_back (to_string (get_rate(), std::dec));
	
	cmd.push_back ("-p");
	cmd.push_back (period_size_combo.get_active_text());

	if (using_alsa) {
		
		if (audio_mode_combo.get_active_text() != _("Playback/Recording on 2 Devices")) {
			cmd.push_back ("-d");
			cmd.push_back (get_device_name (driver, interface_combo.get_active_text()));
		} 

		if (hw_meter_button.get_active()) {
			cmd.push_back ("-M");
		}
		
		if (hw_monitor_button.get_active()) {
			cmd.push_back ("-H");
		}

		str = dither_mode_combo.get_active_text();

		if (str == _("None")) {
		} else if (str == _("Triangular")) {
			cmd.push_back ("-z triangular");
		} else if (str == _("Rectangular")) {
			cmd.push_back ("-z rectangular");
		} else if (str == _("Shaped")) {
			cmd.push_back ("-z shaped");
		}

		if (force16bit_button.get_active()) {
			cmd.push_back ("-S");
		}
		
		if (soft_mode_button.get_active()) {
			cmd.push_back ("-s");
		}

	} else if (using_coreaudio) {

#ifdef __APPLE__
		// note: older versions of the CoreAudio JACK backend use -n instead of -d here
		cmd.push_back ("-d");
		cmd.push_back (get_device_name (driver, interface_combo.get_active_text()));
#endif

	} else if (using_oss) {

	} else if (using_netjack) {

	}
}

bool
EngineControl::engine_running ()
{
	jack_status_t status;
	jack_client_t* c = jack_client_open ("ardourprobe", JackNoStartServer, &status);

	if (status == 0) {
		jack_client_close (c);
		return true;
	}
	return false;
}

int
EngineControl::setup_engine ()
{
	vector<string> args;
	std::string cwd = "/tmp";

	build_command_line (args);

	Glib::ustring jackdrc_path = Glib::get_home_dir();
	jackdrc_path += "/.jackdrc";

	ofstream jackdrc (jackdrc_path.c_str());
	if (!jackdrc) {
		error << string_compose (_("cannot open JACK rc file %1 to store parameters"), jackdrc_path) << endmsg;
		return -1;
	}

	for (vector<string>::iterator i = args.begin(); i != args.end(); ++i) {
		jackdrc << (*i) << ' ';
	}
	jackdrc << endl;
	jackdrc.close ();

	_used = true;

	return 0;
}

void
EngineControl::realtime_changed ()
{
#ifndef __APPLE__
	priority_spinner.set_sensitive (realtime_button.get_active());
#endif
}

void
EngineControl::enumerate_devices (const string& driver)
{
	/* note: case matters for the map keys */

	if (driver == "CoreAudio") {
#ifdef __APPLE__		
		devices[driver] = enumerate_coreaudio_devices ();
#endif
	} else if (driver == "ALSA") {
		devices[driver] = enumerate_alsa_devices ();
	} else if (driver == "FFADO") {
		devices[driver] = enumerate_ffado_devices ();
	} else if (driver == "OSS") {
		devices[driver] = enumerate_oss_devices ();
	} else if (driver == "Dummy") {
		devices[driver] = enumerate_dummy_devices ();
	} else if (driver == "NetJACK") {
		devices[driver] = enumerate_netjack_devices ();
	}
}

#ifdef __APPLE__
static OSStatus 
getDeviceUIDFromID( AudioDeviceID id, char *name, size_t nsize)
{
	UInt32 size = sizeof(CFStringRef);
	CFStringRef UI;
	OSStatus res = AudioDeviceGetProperty(id, 0, false,
		kAudioDevicePropertyDeviceUID, &size, &UI);
	if (res == noErr) 
		CFStringGetCString(UI,name,nsize,CFStringGetSystemEncoding());
	CFRelease(UI);
	return res;
}

vector<string>
EngineControl::enumerate_coreaudio_devices ()
{
	vector<string> devs;
	
	// Find out how many Core Audio devices are there, if any...
	// (code snippet gently "borrowed" from St?hane Letz jackdmp;)
	OSStatus err;
	Boolean isWritable;
	size_t outSize = sizeof(isWritable);

	backend_devs.clear ();

	err = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices,
					   &outSize, &isWritable);
	if (err == noErr) {
		// Calculate the number of device available...
		int numCoreDevices = outSize / sizeof(AudioDeviceID);
		// Make space for the devices we are about to get...
		AudioDeviceID *coreDeviceIDs = new AudioDeviceID [numCoreDevices];
		err = AudioHardwareGetProperty(kAudioHardwarePropertyDevices,
					       &outSize, (void *) coreDeviceIDs);
		if (err == noErr) {
			// Look for the CoreAudio device name...
			char coreDeviceName[256];
			size_t nameSize;

			for (int i = 0; i < numCoreDevices; i++) {

				nameSize = sizeof (coreDeviceName);

				/* enforce duplex devices only */

				err = AudioDeviceGetPropertyInfo(coreDeviceIDs[i],
								 0, true, kAudioDevicePropertyStreams,
								 &outSize, &isWritable);

				if (err != noErr || outSize == 0) {
					continue;
				}

				err = AudioDeviceGetPropertyInfo(coreDeviceIDs[i],
								 0, false, kAudioDevicePropertyStreams,
								 &outSize, &isWritable);

				if (err != noErr || outSize == 0) {
					continue;
				}

				err = AudioDeviceGetPropertyInfo(coreDeviceIDs[i],
								 0, true, kAudioDevicePropertyDeviceName,
								 &outSize, &isWritable);
				if (err == noErr) {
					err = AudioDeviceGetProperty(coreDeviceIDs[i],
								     0, true, kAudioDevicePropertyDeviceName,
								     &nameSize, (void *) coreDeviceName);
					if (err == noErr) {
						char drivername[128];

						// this returns the unique id for the device
						// that must be used on the commandline for jack
						
						if (getDeviceUIDFromID(coreDeviceIDs[i], drivername, sizeof (drivername)) == noErr) {
							devs.push_back (coreDeviceName);
							backend_devs.push_back (drivername);
						} 
					}
				}
			}
		}
		delete [] coreDeviceIDs;
	}


	if (devs.size() == 0) {
		MessageDialog msg (_("\
You do not have any audio devices capable of\n\
simultaneous playback and recording.\n\n\
Please use Applications -> Utilities -> Audio MIDI Setup\n\
to create an \"aggregrate\" device, or install a suitable\n\
audio interface.\n\n\
Please send email to Apple and ask them why new Macs\n\
have no duplex audio device.\n\n\
Alternatively, if you really want just playback\n\
or recording but not both, start JACK before running\n\
Ardour and choose the relevant device then."
					   ), 
				   true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK);
		msg.set_title (_("No suitable audio devices"));
		msg.set_position (Gtk::WIN_POS_MOUSE);
		msg.run ();
		exit (1);
	}


	return devs;
}
#else
vector<string>
EngineControl::enumerate_alsa_devices ()
{
	vector<string> devs;

	snd_ctl_t *handle;
	snd_ctl_card_info_t *info;
	snd_pcm_info_t *pcminfo;
	snd_ctl_card_info_alloca(&info);
	snd_pcm_info_alloca(&pcminfo);
	string devname;
	int cardnum = -1;
	int device = -1;

	backend_devs.clear ();

	while (snd_card_next (&cardnum) >= 0 && cardnum >= 0) {

		devname = "hw:";
		devname += to_string (cardnum, std::dec);

		if (snd_ctl_open (&handle, devname.c_str(), 0) >= 0 && snd_ctl_card_info (handle, info) >= 0) {

			while (snd_ctl_pcm_next_device (handle, &device) >= 0 && device >= 0) {

				bool have_playback = false;
				bool have_capture = false;

				/* find duplex devices only */

				snd_pcm_info_set_device (pcminfo, device);
				snd_pcm_info_set_subdevice (pcminfo, 0);
				snd_pcm_info_set_stream (pcminfo, SND_PCM_STREAM_CAPTURE);

				if (snd_ctl_pcm_info (handle, pcminfo) >= 0) {
					have_capture = true;
				}

				snd_pcm_info_set_device (pcminfo, device);
				snd_pcm_info_set_subdevice (pcminfo, 0);
				snd_pcm_info_set_stream (pcminfo, SND_PCM_STREAM_PLAYBACK);

				if (snd_ctl_pcm_info (handle, pcminfo) >= 0) {
					have_playback = true;
				}

				if (have_capture && have_playback) {
					devs.push_back (snd_pcm_info_get_name (pcminfo));
					devname += ',';
					devname += to_string (device, std::dec);
					backend_devs.push_back (devname);
				}
			}

			snd_ctl_close(handle);
		}
	}

	return devs;
}

vector<string>
EngineControl::enumerate_ffado_devices ()
{
	vector<string> devs;
	backend_devs.clear ();
	return devs;
}

vector<string>
EngineControl::enumerate_oss_devices ()
{
	vector<string> devs;
	return devs;
}
vector<string>
EngineControl::enumerate_dummy_devices ()
{
	vector<string> devs;
	return devs;
}
vector<string>
EngineControl::enumerate_netjack_devices ()
{
	vector<string> devs;
	return devs;
}
#endif

void
EngineControl::driver_changed ()
{
	string driver = driver_combo.get_active_text();
	string::size_type maxlen = 0;
	int maxindex = -1;
	int n = 0;

	enumerate_devices (driver);

	vector<string>& strings = devices[driver];

	if (strings.empty()) {
		error << string_compose (_("No devices found for driver \"%1\""), driver) << endmsg;
		return;
	}
	
	for (vector<string>::iterator i = strings.begin(); i != strings.end(); ++i, ++n) {
		if ((*i).length() > maxlen) {
			maxlen = (*i).length();
			maxindex = n;
		}
	}

	set_popdown_strings (interface_combo, strings);
	set_popdown_strings (input_device_combo, strings);
	set_popdown_strings (output_device_combo, strings);

	if (!strings.empty()) {
		interface_combo.set_active_text (strings.front());
		input_device_combo.set_active_text (strings.front());
		output_device_combo.set_active_text (strings.front());
	}
	
	if (driver == "ALSA") {
		soft_mode_button.set_sensitive (true);
		force16bit_button.set_sensitive (true);
		hw_monitor_button.set_sensitive (true);
		hw_meter_button.set_sensitive (true);
		monitor_button.set_sensitive (true);
	} else {
		soft_mode_button.set_sensitive (false);
		force16bit_button.set_sensitive (false);
		hw_monitor_button.set_sensitive (false);
		hw_meter_button.set_sensitive (false);
		monitor_button.set_sensitive (false);
	}
}

uint32_t
EngineControl::get_rate ()
{
	return atoi (sample_rate_combo.get_active_text ());
}

void
EngineControl::redisplay_latency ()
{
	uint32_t rate = get_rate();
#ifdef __APPLE_
	float periods = 2;
#else
	float periods = periods_adjustment.get_value();
#endif
	float period_size = atof (period_size_combo.get_active_text());

	char buf[32];
	snprintf (buf, sizeof(buf), "%.1fmsec", (periods * period_size) / (rate/1000.0));

	latency_label.set_text (buf);
}

void
EngineControl::audio_mode_changed ()
{
	Glib::ustring str = audio_mode_combo.get_active_text();

	if (str == _("Playback/Recording on 1 Device")) {
		input_device_combo.set_sensitive (false);
		output_device_combo.set_sensitive (false);
	} else if (str == _("Playback/Recording on 2 Devices")) {
		input_device_combo.set_sensitive (true);
		output_device_combo.set_sensitive (true);
	} else if (str == _("Playback only")) {
		output_device_combo.set_sensitive (true);
	} else if (str == _("Recording only")) {
		input_device_combo.set_sensitive (true);
	}
}

static bool jack_server_filter(const string& str, void *arg)
{
   return str == "jackd" || str == "jackdmp";
}

void
EngineControl::find_jack_servers (vector<string>& strings)
{
#ifdef __APPLE__
	/* this magic lets us finds the path to the OSX bundle, and then
	   we infer JACK's location from there
	*/
	
	char execpath[MAXPATHLEN+1];
	uint32_t pathsz = sizeof (execpath);

	_NSGetExecutablePath (execpath, &pathsz);
	
	Glib::ustring path (Glib::path_get_dirname (execpath));
	path += "/jackd";

	if (Glib::file_test (path, FILE_TEST_EXISTS)) {
		strings.push_back (path);
	} 

	if (getenv ("ARDOUR_WITH_JACK")) {
		/* no other options - only use the JACK we supply */
		if (strings.empty()) {
			fatal << _("JACK appears to be missing from the Ardour bundle") << endmsg;
			/*NOTREACHED*/
		}
		return;
	}
#else
	string path;
#endif
	
	PathScanner scanner;
	vector<string *> *jack_servers;
	std::map<string,int> un;
	
	path = getenv ("PATH");

	jack_servers = scanner (path, jack_server_filter, 0, false, true);
	
	vector<string *>::iterator iter;
	
	for (iter = jack_servers->begin(); iter != jack_servers->end(); iter++) {
		string p = **iter;
		
		if (un[p]++ == 0) {
			strings.push_back(p);
		}
	}
}

string
EngineControl::get_device_name (const string& driver, const string& human_readable)
{
	vector<string>::iterator n;
	vector<string>::iterator i;

	if (backend_devs.empty()) {
		return human_readable;
	}
	
	for (i = devices[driver].begin(), n = backend_devs.begin(); i != devices[driver].end(); ++i, ++n) {
		if (human_readable == (*i)) {
			return (*n);
		}
	}
	
	if (i == devices[driver].end()) {
		fatal << string_compose (_("programming error: %1"), "true hardware name for ID missing") << endmsg;
		/*NOTREACHED*/
	}

	/* keep gcc happy */

	return string();
}

XMLNode&
EngineControl::get_state ()
{
	XMLNode* root = new XMLNode ("AudioSetup");
	XMLNode* child;
	Glib::ustring path;

	child = new XMLNode ("periods");
	child->add_property ("val", to_string (periods_adjustment.get_value(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("priority");
	child->add_property ("val", to_string (priority_adjustment.get_value(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("ports");
	child->add_property ("val", to_string (ports_adjustment.get_value(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("inchannels");
	child->add_property ("val", to_string (input_channels.get_value(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("outchannels");
	child->add_property ("val", to_string (output_channels.get_value(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("inlatency");
	child->add_property ("val", to_string (input_latency.get_value(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("outlatency");
	child->add_property ("val", to_string (output_latency.get_value(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("realtime");
	child->add_property ("val", to_string (realtime_button.get_active(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("nomemorylock");
	child->add_property ("val", to_string (no_memory_lock_button.get_active(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("unlockmemory");
	child->add_property ("val", to_string (unlock_memory_button.get_active(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("softmode");
	child->add_property ("val", to_string (soft_mode_button.get_active(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("force16bit");
	child->add_property ("val", to_string (force16bit_button.get_active(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("hwmonitor");
	child->add_property ("val", to_string (hw_monitor_button.get_active(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("hwmeter");
	child->add_property ("val", to_string (hw_meter_button.get_active(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("verbose");
	child->add_property ("val", to_string (verbose_output_button.get_active(), std::dec));
	root->add_child_nocopy (*child);

	child = new XMLNode ("samplerate");
	child->add_property ("val", sample_rate_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("periodsize");
	child->add_property ("val", period_size_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("serverpath");
	child->add_property ("val", serverpath_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("driver");
	child->add_property ("val", driver_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("interface");
	child->add_property ("val", interface_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("timeout");
	child->add_property ("val", timeout_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("dither");
	child->add_property ("val", dither_mode_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("audiomode");
	child->add_property ("val", audio_mode_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("inputdevice");
	child->add_property ("val", input_device_combo.get_active_text());
	root->add_child_nocopy (*child);

	child = new XMLNode ("outputdevice");
	child->add_property ("val", output_device_combo.get_active_text());
	root->add_child_nocopy (*child);
	
	return *root;
}

void
EngineControl::set_state (const XMLNode& root)
{
	XMLNodeList          clist;
	XMLNodeConstIterator citer;
	XMLNode* child;
	XMLProperty* prop;
	bool using_dummy = false;
	
	int val;
	string strval;
	
	if ( (child = root.child ("driver"))){
		prop = child->property("val");
		if (prop && (prop->value() == "Dummy") ) {
			using_dummy = true;
		}
	}
	
	clist = root.children();

	for (citer = clist.begin(); citer != clist.end(); ++citer) {

		child = *citer;

		prop = child->property ("val");

		if (!prop || prop->value().empty()) {

			if ( using_dummy && ( child->name() == "interface" || child->name() == "inputdevice" || child->name() == "outputdevice" ))
				continue;
			error << string_compose (_("AudioSetup value for %1 is missing data"), child->name()) << endmsg;
			continue;
		}
		
		strval = prop->value();

		/* adjustments/spinners */

		if (child->name() == "periods") {
			val = atoi (strval);
			periods_adjustment.set_value(val);
		} else if (child->name() == "priority") {
			val = atoi (strval);
			priority_adjustment.set_value(val);
		} else if (child->name() == "ports") {
			val = atoi (strval);
			ports_adjustment.set_value(val);
		} else if (child->name() == "inchannels") {
			val = atoi (strval);
			input_channels.set_value(val);
		} else if (child->name() == "outchannels") {
			val = atoi (strval);
			output_channels.set_value(val);
		} else if (child->name() == "inlatency") {
			val = atoi (strval);
			input_latency.set_value(val);
		} else if (child->name() == "outlatency") {
			val = atoi (strval);
			output_latency.set_value(val);
		}

		/* buttons */

		else if (child->name() == "realtime") {
			val = atoi (strval);
			realtime_button.set_active(val);
		} else if (child->name() == "nomemorylock") {
			val = atoi (strval);
			no_memory_lock_button.set_active(val);
		} else if (child->name() == "unlockmemory") {
			val = atoi (strval);
			unlock_memory_button.set_active(val);
		} else if (child->name() == "softmode") {
			val = atoi (strval);
			soft_mode_button.set_active(val);
		} else if (child->name() == "force16bit") {
			val = atoi (strval);
			force16bit_button.set_active(val);
		} else if (child->name() == "hwmonitor") {
			val = atoi (strval);
			hw_monitor_button.set_active(val);
		} else if (child->name() == "hwmeter") {
			val = atoi (strval);
			hw_meter_button.set_active(val);
		} else if (child->name() == "verbose") {
			val = atoi (strval);
			verbose_output_button.set_active(val);
		}

		/* combos */

		else if (child->name() == "samplerate") {
			sample_rate_combo.set_active_text(strval);
		} else if (child->name() == "periodsize") {
			period_size_combo.set_active_text(strval);
		} else if (child->name() == "serverpath") {
			/* do not allow us to use a server path that doesn't
			   exist on this system. this handles cases where
			   the user has an RC file listing a serverpath
			   from some other machine.
			*/
			vector<string>::iterator x;
			for (x = server_strings.begin(); x != server_strings.end(); ++x) {
				if (*x == strval) {
					break;
				}
			}
			if (x != server_strings.end()) {
				serverpath_combo.set_active_text (strval);
			} else {
				warning << string_compose (_("configuration files contain a JACK server path that doesn't exist (%1)"),
							     strval)
					<< endmsg;
			}
		} else if (child->name() == "driver") {
			driver_combo.set_active_text(strval);
		} else if (child->name() == "interface") {
			interface_combo.set_active_text(strval);
		} else if (child->name() == "timeout") {
			timeout_combo.set_active_text(strval);
		} else if (child->name() == "dither") {
			dither_mode_combo.set_active_text(strval);
		} else if (child->name() == "audiomode") {
			audio_mode_combo.set_active_text(strval);
		} else if (child->name() == "inputdevice") {
			input_device_combo.set_active_text(strval);
		} else if (child->name() == "outputdevice") {
			output_device_combo.set_active_text(strval);
		}
	}
}