drivers/audio/AudioOutputDeviceFactory.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2009 Christian Schoenebeck                       *
 *                                                                         *
 *   This library 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 library 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 library; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#include "AudioOutputDeviceFactory.h"

#include "../../common/global_private.h"

#if HAVE_ALSA
# include "AudioOutputDeviceAlsa.h"
#endif // HAVE_ALSA

#if HAVE_JACK
# include "AudioOutputDeviceJack.h"
#endif // HAVE_JACK

#if HAVE_ARTS
# include "AudioOutputDeviceArts.h"
#endif // HAVE_ARTS

#if HAVE_ASIO
# include "AudioOutputDeviceAsio.h"
#endif // HAVE_ASIO

#if HAVE_COREAUDIO
# include "AudioOutputDeviceCoreAudio.h"
#endif // HAVE_COREAUDIO

namespace LinuxSampler {

    std::map<String, AudioOutputDeviceFactory::InnerFactory*> AudioOutputDeviceFactory::InnerFactories;
    std::map<String, DeviceParameterFactory*> AudioOutputDeviceFactory::ParameterFactories;

#if HAVE_ALSA
    REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceAlsa);
    /* Common parameters for now they'll have to be registered here. */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterActive);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterSampleRate);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterChannels);
    /* Driver specific parameters */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterCard);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterFragments);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterFragmentSize);
#endif // HAVE_ALSA

#if HAVE_JACK
    REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceJack);
    /* Common parameters for now they'll have to be registered here. */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceJack, ParameterActive);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceJack, ParameterSampleRate);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceJack, ParameterChannels);
    /* Driver specific parameters */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceJack, ParameterName);
#endif // HAVE_JACK

#if HAVE_ARTS
    REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceArts);
    /* Common parameters for now they'll have to be registered here. */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceArts, ParameterActive);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceArts, ParameterSampleRate);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceArts, ParameterChannels);
    /* Driver specific parameters */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceArts, ParameterName);
#endif // HAVE_ARTS

#if HAVE_ASIO
    REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceAsio);
    /* Common parameters for now they'll have to be registered here. */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterActive);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterSampleRate);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterChannels);
    /* Driver specific parameters */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterCard);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterFragmentSize);
#endif // HAVE_ASIO

#if HAVE_COREAUDIO
    REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceCoreAudio);
    /* Common parameters for now they'll have to be registered here. */
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterActive);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterSampleRate);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterChannels);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterDevice);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterBuffers);
    REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterBufferSize);
#endif // HAVE_COREAUDIO

    AudioOutputDeviceFactory::AudioOutputDeviceMap AudioOutputDeviceFactory::mAudioOutputDevices;

    /**
     * Creates a new audio output device for the given driver name and
     * parameters. Note, this method will also check whether it is actually
     * allowed to create an instance of the given driver on its own and throw
     * an Exception in case it is not allowed (this is the case for host plugin
     * drivers like VST, AU, DSSI, LV2).
     *
     * @param DriverName - name of the driver of which a new device shall be created
     * @param Parameters - device creation parameters which shall be passed to the driver's constructor
     *
     * @returns pointer to the new device instance
     * @throws Exception - in case the device could not be created
     *
     * @see CreatePrivate()
     */
    AudioOutputDevice* AudioOutputDeviceFactory::Create(String DriverName, std::map<String,String> Parameters) throw (Exception) {
        if (!InnerFactories.count(DriverName))
            throw Exception("There is no audio output driver '" + DriverName + "'.");
        if (!InnerFactories[DriverName]->isAutonomousDriver())
            throw Exception("You cannot directly create a new audio output device of the '" + DriverName + "' driver!");

        return CreatePrivate(DriverName, Parameters);
    }

    /**
     * Same as Create(), but this method won't check whether it is allowed to
     * create an instance of the given driver on its own. This method is
     * usually called by host plugins (e.g. VST, AU, DSSI, LV2) to actually
     * create their respective audio output devices for the sampler. Usually
     * one shouldn't call this method directly, but call Create() instead.
     */
    AudioOutputDevice* AudioOutputDeviceFactory::CreatePrivate(String DriverName, std::map<String,String> Parameters) throw (Exception) {
        if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
        // let's see if we need to create parameters
        std::map<String,DeviceCreationParameter*> thisDeviceParams;
        DeviceParameterFactory* pParamFactory = ParameterFactories[DriverName];
        if (pParamFactory) {
            thisDeviceParams = pParamFactory->CreateAllParams(Parameters);
        } else {
            // no parameters are registered by the driver. Throw if any parameters were specified.
            if (Parameters.size() != 0) throw Exception("Driver '" + DriverName + "' does not have any parameters.");
        }

        // get a free device id
        int iDeviceId = -1;
        for (int i = 0; i >= 0; i++) { // seek for a free place starting from the beginning
            if (!mAudioOutputDevices[i]) {
                iDeviceId = i;
                break;
            }
        }
        if (iDeviceId < 0)
            throw Exception("Could not retrieve free device ID!");

        // now create the device using those parameters
        AudioOutputDevice* pDevice = InnerFactories[DriverName]->Create(thisDeviceParams);
        pDevice->setDeviceId(iDeviceId);
        // now attach all parameters to the newely created device.
        for (std::map<String,DeviceCreationParameter*>::iterator iter = thisDeviceParams.begin(); iter != thisDeviceParams.end(); iter++) {
            iter->second->Attach(pDevice);
        }

        // add new audio device to the audio device list
        mAudioOutputDevices[iDeviceId] = pDevice;

        return pDevice;
    }

    std::vector<String> AudioOutputDeviceFactory::AvailableDrivers() {
        std::vector<String> result;
        std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
        while (iter != InnerFactories.end()) {
            result.push_back(iter->first);
            iter++;
        }
        return result;
    }

    String AudioOutputDeviceFactory::AvailableDriversAsString() {
        std::vector<String> drivers = AvailableDrivers();
        String result;
        std::vector<String>::iterator iter = drivers.begin();
        for (; iter != drivers.end(); iter++) {
            if (result != "") result += ",";
            result += *iter;
        }
        return result;
    }

    std::map<String,DeviceCreationParameter*> AudioOutputDeviceFactory::GetAvailableDriverParameters(String DriverName) throw (Exception) {
        if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
        std::map<String,DeviceCreationParameter*> thisDeviceParams;
        DeviceParameterFactory* pParamFactory = ParameterFactories[DriverName];
        if (pParamFactory) {
            thisDeviceParams = pParamFactory->CreateAllParams();
        }
        return thisDeviceParams;
    }

    DeviceCreationParameter* AudioOutputDeviceFactory::GetDriverParameter(String DriverName, String ParameterName) throw (Exception) {
        if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
        DeviceParameterFactory* pParamFactory = ParameterFactories[DriverName];
        if (pParamFactory) {
            try { return pParamFactory->Create(ParameterName); }
            catch(Exception e) { }
        }
        throw Exception("Audio output driver '" + DriverName + "' does not have a parameter '" + ParameterName + "'.");
    }

    String AudioOutputDeviceFactory::GetDriverDescription(String DriverName) throw (Exception) {
        if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
        return InnerFactories[DriverName]->Description();
    }

    String AudioOutputDeviceFactory::GetDriverVersion(String DriverName) throw (Exception) {
        if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
        return InnerFactories[DriverName]->Version();
    }

    void AudioOutputDeviceFactory::Unregister(String DriverName) {
        std::map<String, InnerFactory*>::iterator iter = InnerFactories.find(DriverName);
        if (iter != InnerFactories.end()) {
            delete iter->second;
            InnerFactories.erase(iter);
        }

        std::map<String, DeviceParameterFactory*>::iterator iterpf = ParameterFactories.find(DriverName);
        if (iterpf != ParameterFactories.end()) {
            delete iterpf->second;
            ParameterFactories.erase(iterpf);
        }
    }

    std::map<uint, AudioOutputDevice*> AudioOutputDeviceFactory::Devices() {
        return mAudioOutputDevices;
    }

    /**
     * Destroys the given device. Usually this method shouldn't be called
     * directly, Sampler::DestroyAudioOutputDevice should be called instead,
     * since it also takes care whether some sampler channel is still using
     * the device, etc.
     */
    void AudioOutputDeviceFactory::Destroy(AudioOutputDevice* pDevice) throw (Exception) {
        if (pDevice && !pDevice->isAutonomousDevice())
            throw Exception("You cannot directly destroy this '" + pDevice->Driver() + "' device!");

        DestroyPrivate(pDevice);
    }

    void AudioOutputDeviceFactory::DestroyPrivate(AudioOutputDevice* pDevice) throw (Exception) {
        AudioOutputDeviceMap::iterator iter = mAudioOutputDevices.begin();
        for (; iter != mAudioOutputDevices.end(); iter++) {
            if (iter->second == pDevice) {
                // disable device
                pDevice->Stop();
                // remove device from the device list
                mAudioOutputDevices.erase(iter);
                // destroy and free device from memory
                delete pDevice;

                break;
            }
        }
    }

} // namespace LinuxSampler
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 - 2009 Christian Schoenebeck *
7	* *
8	* This library is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This library is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this library; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#include "AudioOutputDeviceFactory.h"
25
26	#include "../../common/global_private.h"
27
28	#if HAVE_ALSA
29	# include "AudioOutputDeviceAlsa.h"
30	#endif // HAVE_ALSA
31
32	#if HAVE_JACK
33	# include "AudioOutputDeviceJack.h"
34	#endif // HAVE_JACK
35
36	#if HAVE_ARTS
37	# include "AudioOutputDeviceArts.h"
38	#endif // HAVE_ARTS
39
40	#if HAVE_ASIO
41	# include "AudioOutputDeviceAsio.h"
42	#endif // HAVE_ASIO
43
44	#if HAVE_COREAUDIO
45	# include "AudioOutputDeviceCoreAudio.h"
46	#endif // HAVE_COREAUDIO
47
48	namespace LinuxSampler {
49
50	std::map<String, AudioOutputDeviceFactory::InnerFactory*> AudioOutputDeviceFactory::InnerFactories;
51	std::map<String, DeviceParameterFactory*> AudioOutputDeviceFactory::ParameterFactories;
52
53	#if HAVE_ALSA
54	REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceAlsa);
55	/* Common parameters for now they'll have to be registered here. */
56	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterActive);
57	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterSampleRate);
58	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterChannels);
59	/* Driver specific parameters */
60	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterCard);
61	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterFragments);
62	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAlsa, ParameterFragmentSize);
63	#endif // HAVE_ALSA
64
65	#if HAVE_JACK
66	REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceJack);
67	/* Common parameters for now they'll have to be registered here. */
68	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceJack, ParameterActive);
69	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceJack, ParameterSampleRate);
70	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceJack, ParameterChannels);
71	/* Driver specific parameters */
72	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceJack, ParameterName);
73	#endif // HAVE_JACK
74
75	#if HAVE_ARTS
76	REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceArts);
77	/* Common parameters for now they'll have to be registered here. */
78	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceArts, ParameterActive);
79	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceArts, ParameterSampleRate);
80	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceArts, ParameterChannels);
81	/* Driver specific parameters */
82	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceArts, ParameterName);
83	#endif // HAVE_ARTS
84
85	#if HAVE_ASIO
86	REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceAsio);
87	/* Common parameters for now they'll have to be registered here. */
88	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterActive);
89	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterSampleRate);
90	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterChannels);
91	/* Driver specific parameters */
92	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterCard);
93	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceAsio, ParameterFragmentSize);
94	#endif // HAVE_ASIO
95
96	#if HAVE_COREAUDIO
97	REGISTER_AUDIO_OUTPUT_DRIVER(AudioOutputDeviceCoreAudio);
98	/* Common parameters for now they'll have to be registered here. */
99	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterActive);
100	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterSampleRate);
101	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterChannels);
102	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterDevice);
103	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterBuffers);
104	REGISTER_AUDIO_OUTPUT_DRIVER_PARAMETER(AudioOutputDeviceCoreAudio, ParameterBufferSize);
105	#endif // HAVE_COREAUDIO
106
107	AudioOutputDeviceFactory::AudioOutputDeviceMap AudioOutputDeviceFactory::mAudioOutputDevices;
108
109	/**
110	* Creates a new audio output device for the given driver name and
111	* parameters. Note, this method will also check whether it is actually
112	* allowed to create an instance of the given driver on its own and throw
113	* an Exception in case it is not allowed (this is the case for host plugin
114	* drivers like VST, AU, DSSI, LV2).
115	*
116	* @param DriverName - name of the driver of which a new device shall be created
117	* @param Parameters - device creation parameters which shall be passed to the driver's constructor
118	*
119	* @returns pointer to the new device instance
120	* @throws Exception - in case the device could not be created
121	*
122	* @see CreatePrivate()
123	*/
124	AudioOutputDevice* AudioOutputDeviceFactory::Create(String DriverName, std::map<String,String> Parameters) throw (Exception) {
125	if (!InnerFactories.count(DriverName))
126	throw Exception("There is no audio output driver '" + DriverName + "'.");
127	if (!InnerFactories[DriverName]->isAutonomousDriver())
128	throw Exception("You cannot directly create a new audio output device of the '" + DriverName + "' driver!");
129
130	return CreatePrivate(DriverName, Parameters);
131	}
132
133	/**
134	* Same as Create(), but this method won't check whether it is allowed to
135	* create an instance of the given driver on its own. This method is
136	* usually called by host plugins (e.g. VST, AU, DSSI, LV2) to actually
137	* create their respective audio output devices for the sampler. Usually
138	* one shouldn't call this method directly, but call Create() instead.
139	*/
140	AudioOutputDevice* AudioOutputDeviceFactory::CreatePrivate(String DriverName, std::map<String,String> Parameters) throw (Exception) {
141	if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
142	// let's see if we need to create parameters
143	std::map<String,DeviceCreationParameter*> thisDeviceParams;
144	DeviceParameterFactory* pParamFactory = ParameterFactories[DriverName];
145	if (pParamFactory) {
146	thisDeviceParams = pParamFactory->CreateAllParams(Parameters);
147	} else {
148	// no parameters are registered by the driver. Throw if any parameters were specified.
149	if (Parameters.size() != 0) throw Exception("Driver '" + DriverName + "' does not have any parameters.");
150	}
151
152	// get a free device id
153	int iDeviceId = -1;
154	for (int i = 0; i >= 0; i++) { // seek for a free place starting from the beginning
155	if (!mAudioOutputDevices[i]) {
156	iDeviceId = i;
157	break;
158	}
159	}
160	if (iDeviceId < 0)
161	throw Exception("Could not retrieve free device ID!");
162
163	// now create the device using those parameters
164	AudioOutputDevice* pDevice = InnerFactories[DriverName]->Create(thisDeviceParams);
165	pDevice->setDeviceId(iDeviceId);
166	// now attach all parameters to the newely created device.
167	for (std::map<String,DeviceCreationParameter*>::iterator iter = thisDeviceParams.begin(); iter != thisDeviceParams.end(); iter++) {
168	iter->second->Attach(pDevice);
169	}
170
171	// add new audio device to the audio device list
172	mAudioOutputDevices[iDeviceId] = pDevice;
173
174	return pDevice;
175	}
176
177	std::vector<String> AudioOutputDeviceFactory::AvailableDrivers() {
178	std::vector<String> result;
179	std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
180	while (iter != InnerFactories.end()) {
181	result.push_back(iter->first);
182	iter++;
183	}
184	return result;
185	}
186
187	String AudioOutputDeviceFactory::AvailableDriversAsString() {
188	std::vector<String> drivers = AvailableDrivers();
189	String result;
190	std::vector<String>::iterator iter = drivers.begin();
191	for (; iter != drivers.end(); iter++) {
192	if (result != "") result += ",";
193	result += *iter;
194	}
195	return result;
196	}
197
198	std::map<String,DeviceCreationParameter*> AudioOutputDeviceFactory::GetAvailableDriverParameters(String DriverName) throw (Exception) {
199	if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
200	std::map<String,DeviceCreationParameter*> thisDeviceParams;
201	DeviceParameterFactory* pParamFactory = ParameterFactories[DriverName];
202	if (pParamFactory) {
203	thisDeviceParams = pParamFactory->CreateAllParams();
204	}
205	return thisDeviceParams;
206	}
207
208	DeviceCreationParameter* AudioOutputDeviceFactory::GetDriverParameter(String DriverName, String ParameterName) throw (Exception) {
209	if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
210	DeviceParameterFactory* pParamFactory = ParameterFactories[DriverName];
211	if (pParamFactory) {
212	try { return pParamFactory->Create(ParameterName); }
213	catch(Exception e) { }
214	}
215	throw Exception("Audio output driver '" + DriverName + "' does not have a parameter '" + ParameterName + "'.");
216	}
217
218	String AudioOutputDeviceFactory::GetDriverDescription(String DriverName) throw (Exception) {
219	if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
220	return InnerFactories[DriverName]->Description();
221	}
222
223	String AudioOutputDeviceFactory::GetDriverVersion(String DriverName) throw (Exception) {
224	if (!InnerFactories.count(DriverName)) throw Exception("There is no audio output driver '" + DriverName + "'.");
225	return InnerFactories[DriverName]->Version();
226	}
227
228	void AudioOutputDeviceFactory::Unregister(String DriverName) {
229	std::map<String, InnerFactory*>::iterator iter = InnerFactories.find(DriverName);
230	if (iter != InnerFactories.end()) {
231	delete iter->second;
232	InnerFactories.erase(iter);
233	}
234
235	std::map<String, DeviceParameterFactory*>::iterator iterpf = ParameterFactories.find(DriverName);
236	if (iterpf != ParameterFactories.end()) {
237	delete iterpf->second;
238	ParameterFactories.erase(iterpf);
239	}
240	}
241
242	std::map<uint, AudioOutputDevice*> AudioOutputDeviceFactory::Devices() {
243	return mAudioOutputDevices;
244	}
245
246	/**
247	* Destroys the given device. Usually this method shouldn't be called
248	* directly, Sampler::DestroyAudioOutputDevice should be called instead,
249	* since it also takes care whether some sampler channel is still using
250	* the device, etc.
251	*/
252	void AudioOutputDeviceFactory::Destroy(AudioOutputDevice* pDevice) throw (Exception) {
253	if (pDevice && !pDevice->isAutonomousDevice())
254	throw Exception("You cannot directly destroy this '" + pDevice->Driver() + "' device!");
255
256	DestroyPrivate(pDevice);
257	}
258
259	void AudioOutputDeviceFactory::DestroyPrivate(AudioOutputDevice* pDevice) throw (Exception) {
260	AudioOutputDeviceMap::iterator iter = mAudioOutputDevices.begin();
261	for (; iter != mAudioOutputDevices.end(); iter++) {
262	if (iter->second == pDevice) {
263	// disable device
264	pDevice->Stop();
265	// remove device from the device list
266	mAudioOutputDevices.erase(iter);
267	// destroy and free device from memory
268	delete pDevice;
269
270	break;
271	}
272	}
273	}
274
275	} // namespace LinuxSampler