drivers/audio/AudioOutputDevice.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2010 Christian Schoenebeck                       *
 *                                                                         *
 *   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., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#include "AudioOutputDeviceFactory.h"
#include "AudioOutputDevice.h"
#include "../../common/global_private.h"
#include "../../common/IDGenerator.h"

namespace LinuxSampler {

// *************** ParameterActive ***************
// *

    AudioOutputDevice::ParameterActive::ParameterActive() : DeviceCreationParameterBool() {
        InitWithDefault();
    }

    AudioOutputDevice::ParameterActive::ParameterActive(String s) : DeviceCreationParameterBool(s) {
    }

    String AudioOutputDevice::ParameterActive::Description() {
        return "Enable / disable device";
    }

    bool AudioOutputDevice::ParameterActive::Fix() {
        return false;
    }

    bool AudioOutputDevice::ParameterActive::Mandatory() {
        return false;
    }

    std::map<String,DeviceCreationParameter*> AudioOutputDevice::ParameterActive::DependsAsParameters() {
        return std::map<String,DeviceCreationParameter*>();
    }

    optional<bool> AudioOutputDevice::ParameterActive::DefaultAsBool(std::map<String,String> Parameters) {
        return true;
    }

    void AudioOutputDevice::ParameterActive::OnSetValue(bool b) throw (Exception) {
        if (b) ((AudioOutputDevice*)pDevice)->Play();
        else ((AudioOutputDevice*)pDevice)->Stop();
    }

    String AudioOutputDevice::ParameterActive::Name() {
        return "ACTIVE";
    }


// *************** ParameterSampleRate ***************
// *

    AudioOutputDevice::ParameterSampleRate::ParameterSampleRate() : DeviceCreationParameterInt() {
        InitWithDefault();
    }

    AudioOutputDevice::ParameterSampleRate::ParameterSampleRate(String s) : DeviceCreationParameterInt(s) {
    }

    String AudioOutputDevice::ParameterSampleRate::Description() {
        return "Output sample rate";
    }

    bool AudioOutputDevice::ParameterSampleRate::Fix() {
        return true;
    }

    bool AudioOutputDevice::ParameterSampleRate::Mandatory() {
        return false;
    }

    std::map<String,DeviceCreationParameter*> AudioOutputDevice::ParameterSampleRate::DependsAsParameters() {
        return std::map<String,DeviceCreationParameter*>();
    }

    optional<int> AudioOutputDevice::ParameterSampleRate::DefaultAsInt(std::map<String,String> Parameters) {
        return 44100;
    }

    optional<int> AudioOutputDevice::ParameterSampleRate::RangeMinAsInt(std::map<String,String> Parameters) {
        return optional<int>::nothing;
    }

    optional<int> AudioOutputDevice::ParameterSampleRate::RangeMaxAsInt(std::map<String,String> Parameters) {
        return optional<int>::nothing;
    }

    std::vector<int> AudioOutputDevice::ParameterSampleRate::PossibilitiesAsInt(std::map<String,String> Parameters) {
        return std::vector<int>();
    }

    int AudioOutputDevice::ParameterSampleRate::ValueAsInt() {
        return (pDevice) ? (int) ((AudioOutputDevice*)pDevice)->SampleRate()
                         : DeviceCreationParameterInt::ValueAsInt();
    }

    void AudioOutputDevice::ParameterSampleRate::OnSetValue(int i) throw (Exception) {
        /* cannot happen, as parameter is fix */
    }

    String AudioOutputDevice::ParameterSampleRate::Name() {
        return "SAMPLERATE";
    }


// *************** ParameterChannels ***************
// *

    AudioOutputDevice::ParameterChannels::ParameterChannels() : DeviceCreationParameterInt() {
       InitWithDefault();
    }

    AudioOutputDevice::ParameterChannels::ParameterChannels(String s) : DeviceCreationParameterInt(s) {
    }

    String AudioOutputDevice::ParameterChannels::Description() {
        return "Number of output channels";
    }

    bool AudioOutputDevice::ParameterChannels::Fix() {
        return false;
    }

    bool AudioOutputDevice::ParameterChannels::Mandatory() {
        return false;
    }

    std::map<String,DeviceCreationParameter*> AudioOutputDevice::ParameterChannels::DependsAsParameters() {
        return std::map<String,DeviceCreationParameter*>();
    }

    optional<int> AudioOutputDevice::ParameterChannels::DefaultAsInt(std::map<String,String> Parameters) {
        return 2;
    }

    optional<int> AudioOutputDevice::ParameterChannels::RangeMinAsInt(std::map<String,String> Parameters) {
        return 1;
    }

    optional<int> AudioOutputDevice::ParameterChannels::RangeMaxAsInt(std::map<String,String> Parameters) {
        return optional<int>::nothing;
    }

    std::vector<int> AudioOutputDevice::ParameterChannels::PossibilitiesAsInt(std::map<String,String> Parameters) {
        return std::vector<int>();
    }

    void AudioOutputDevice::ParameterChannels::OnSetValue(int i) throw (Exception) {
        ((AudioOutputDevice*)pDevice)->AcquireChannels(i);
    }

    String AudioOutputDevice::ParameterChannels::Name() {
        return "CHANNELS";
    }


// *************** AudioOutputDevice ***************
// *

    AudioOutputDevice::AudioOutputDevice(std::map<String,DeviceCreationParameter*> DriverParameters)
        : EnginesReader(Engines) {
        this->Parameters = DriverParameters;
        EffectChainIDs = new IDGenerator();
    }

    AudioOutputDevice::~AudioOutputDevice() {
        // delete all audio channels
        {
            std::vector<AudioChannel*>::iterator iter = Channels.begin();
            while (iter != Channels.end()) {
                delete *iter;
                iter++;
            }
            Channels.clear();
        }

        // delete all device parameters
        {
            std::map<String,DeviceCreationParameter*>::iterator iter = Parameters.begin();
            while (iter != Parameters.end()) {
                delete iter->second;
                iter++;
            }
            Parameters.clear();
        }

        // delete all master effect chains
        {
            std::vector<EffectChain*>::iterator iter = vEffectChains.begin();
            while (iter != vEffectChains.end()) {
                delete *iter;
                iter++;
            }
            vEffectChains.clear();
        }
        
        delete EffectChainIDs;
    }

    void AudioOutputDevice::Connect(Engine* pEngine) {
        std::set<Engine*>& engines = Engines.GetConfigForUpdate();
        if (engines.find(pEngine) == engines.end()) {
            engines.insert(pEngine);
            Engines.SwitchConfig().insert(pEngine);
            // make sure the engine knows about the connection
            //pEngine->Connect(this);
        }
    }

    void AudioOutputDevice::Disconnect(Engine* pEngine) {
        std::set<Engine*>& engines = Engines.GetConfigForUpdate();
        if (engines.find(pEngine) != engines.end()) { // if clause to prevent disconnect loop
            engines.erase(pEngine);
            Engines.SwitchConfig().erase(pEngine);
            // make sure the engine knows about the disconnection
            //pEngine->DisconnectAudioOutputDevice();
        }
    }

    AudioChannel* AudioOutputDevice::Channel(uint ChannelIndex) {
        return (ChannelIndex < Channels.size()) ? Channels[ChannelIndex] : NULL;
    }

    void AudioOutputDevice::AcquireChannels(uint Channels) {
        if (Channels > this->Channels.size()) {
            for (int c = this->Channels.size(); c < Channels; c++) {
                this->Channels.push_back(CreateChannel(c));
            }
        }
    }

    uint AudioOutputDevice::ChannelCount() {
        return Channels.size();
    }

    std::map<String,DeviceCreationParameter*> AudioOutputDevice::DeviceParameters() {
        return Parameters;
    }

    EffectChain* AudioOutputDevice::AddSendEffectChain() {
        EffectChain* pChain = new EffectChain(this, EffectChainIDs->create());
        vEffectChains.push_back(pChain);
        return pChain;
    }

    void AudioOutputDevice::RemoveSendEffectChain(uint iChain) throw (Exception) {
        if (iChain >= vEffectChains.size())
            throw Exception(
                "Could not remove send effect chain " + ToString(iChain) +
                ", index out of bounds"
            );
        std::vector<EffectChain*>::iterator iter = vEffectChains.begin();
        for (int i = 0; i < iChain; ++i) ++iter;
        EffectChainIDs->destroy((*iter)->ID());
        vEffectChains.erase(iter);
    }

    EffectChain* AudioOutputDevice::SendEffectChain(uint iChain) const {
        if (iChain >= vEffectChains.size()) return NULL;
        return vEffectChains[iChain];
    }

    EffectChain* AudioOutputDevice::SendEffectChainByID(uint iChainID) const {
        for (int i = 0; i < SendEffectChainCount(); i++) {
            if (SendEffectChain(i)->ID() == iChainID) return SendEffectChain(i);
        }

        return NULL;
    }

    uint AudioOutputDevice::SendEffectChainCount() const {
        return vEffectChains.size();
    }

    // TODO: to be removed
    EffectChain* AudioOutputDevice::AddMasterEffectChain() {
        return AddSendEffectChain();
    }

    // TODO: to be removed
    void AudioOutputDevice::RemoveMasterEffectChain(uint iChain) throw (Exception) {
        RemoveSendEffectChain(iChain);
    }

    // TODO: to be removed
    EffectChain* AudioOutputDevice::MasterEffectChain(uint iChain) const {
        return SendEffectChain(iChain);
    }

    // TODO: to be removed
    uint AudioOutputDevice::MasterEffectChainCount() const {
        return SendEffectChainCount();
    }

    int AudioOutputDevice::RenderAudio(uint Samples) {
        if (Channels.empty()) return 0;

        // reset all channels with silence
        {
            std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
            std::vector<AudioChannel*>::iterator end          = Channels.end();
            for (; iterChannels != end; iterChannels++)
                (*iterChannels)->Clear(Samples); // zero out audio buffer
        }
        // do the same for master effects
        {
            std::vector<EffectChain*>::iterator iterChains = vEffectChains.begin();
            std::vector<EffectChain*>::iterator end        = vEffectChains.end();
            for (; iterChains != end; ++iterChains)
                (*iterChains)->ClearAllChannels(); // zero out audio buffers
        }

        int result = 0;

        // let all connected engines render audio for the current audio fragment cycle
        const std::set<Engine*>& engines = EnginesReader.Lock();
        #if CONFIG_RT_EXCEPTIONS
        try
        #endif // CONFIG_RT_EXCEPTIONS
        {
            std::set<Engine*>::iterator iterEngine = engines.begin();
            std::set<Engine*>::iterator end        = engines.end();
            for (; iterEngine != end; iterEngine++) {
                int res = (*iterEngine)->RenderAudio(Samples);
                if (res != 0) result = res;
            }
        }
        #if CONFIG_RT_EXCEPTIONS
        catch (std::runtime_error se) {
            std::cerr << "std::runtime_error: " << se.what() << std::endl << std::flush;
            exit(EXIT_FAILURE);
        }
        #endif // CONFIG_RT_EXCEPTIONS
        EnginesReader.Unlock();

        // now that the engines (might) have left fx send signals for master
        // effects, render all master effects
        {
            std::vector<EffectChain*>::iterator iterChains = vEffectChains.begin();
            std::vector<EffectChain*>::iterator end        = vEffectChains.end();
            for (; iterChains != end; ++iterChains) {
                if (!(*iterChains)->EffectCount()) continue;
                (*iterChains)->RenderAudio(Samples);
                // mix the result of the last effect in the chain to the audio
                // output device channel(s)
                Effect* pLastEffect =
                    (*iterChains)->GetEffect((*iterChains)->EffectCount() - 1);
                for (int iChan = 0; iChan < pLastEffect->OutputChannelCount() && iChan < ChannelCount(); ++iChan)
                    pLastEffect->OutputChannel(iChan)->MixTo(Channel(iChan), Samples);
            }
        }

        return result;
    }

    int AudioOutputDevice::RenderSilence(uint Samples) {
        if (Channels.empty()) return 0;

        // reset all channels with silence
        {
            std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
            std::vector<AudioChannel*>::iterator end          = Channels.end();
            for (; iterChannels != end; iterChannels++)
                (*iterChannels)->Clear(Samples); // zero out audio buffer
        }

        return 0;
    }

} // namespace LinuxSampler
1	schoenebeck	200	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	2137	* Copyright (C) 2005 - 2010 Christian Schoenebeck *
7	schoenebeck	200	* *
8			* This program 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 program 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 program; 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			#include "AudioOutputDevice.h"
26	schoenebeck	1424	#include "../../common/global_private.h"
27	schoenebeck	2135	#include "../../common/IDGenerator.h"
28	schoenebeck	200
29			namespace LinuxSampler {
30
31	schoenebeck	226	// ************* ParameterActive *************
32			// *
33
34			AudioOutputDevice::ParameterActive::ParameterActive() : DeviceCreationParameterBool() {
35			InitWithDefault();
36			}
37
38			AudioOutputDevice::ParameterActive::ParameterActive(String s) : DeviceCreationParameterBool(s) {
39			}
40
41			String AudioOutputDevice::ParameterActive::Description() {
42			return "Enable / disable device";
43			}
44
45			bool AudioOutputDevice::ParameterActive::Fix() {
46			return false;
47			}
48
49			bool AudioOutputDevice::ParameterActive::Mandatory() {
50			return false;
51			}
52
53			std::map<String,DeviceCreationParameter*> AudioOutputDevice::ParameterActive::DependsAsParameters() {
54			return std::map<String,DeviceCreationParameter*>();
55			}
56
57			optional<bool> AudioOutputDevice::ParameterActive::DefaultAsBool(std::map<String,String> Parameters) {
58			return true;
59			}
60
61	schoenebeck	880	void AudioOutputDevice::ParameterActive::OnSetValue(bool b) throw (Exception) {
62	schoenebeck	226	if (b) ((AudioOutputDevice*)pDevice)->Play();
63			else ((AudioOutputDevice*)pDevice)->Stop();
64			}
65
66			String AudioOutputDevice::ParameterActive::Name() {
67			return "ACTIVE";
68			}
69
70
71
72			// ************* ParameterSampleRate *************
73			// *
74
75			AudioOutputDevice::ParameterSampleRate::ParameterSampleRate() : DeviceCreationParameterInt() {
76			InitWithDefault();
77			}
78
79			AudioOutputDevice::ParameterSampleRate::ParameterSampleRate(String s) : DeviceCreationParameterInt(s) {
80			}
81
82			String AudioOutputDevice::ParameterSampleRate::Description() {
83			return "Output sample rate";
84			}
85
86			bool AudioOutputDevice::ParameterSampleRate::Fix() {
87			return true;
88			}
89
90			bool AudioOutputDevice::ParameterSampleRate::Mandatory() {
91			return false;
92			}
93
94			std::map<String,DeviceCreationParameter*> AudioOutputDevice::ParameterSampleRate::DependsAsParameters() {
95			return std::map<String,DeviceCreationParameter*>();
96			}
97
98			optional<int> AudioOutputDevice::ParameterSampleRate::DefaultAsInt(std::map<String,String> Parameters) {
99			return 44100;
100			}
101
102			optional<int> AudioOutputDevice::ParameterSampleRate::RangeMinAsInt(std::map<String,String> Parameters) {
103			return optional<int>::nothing;
104			}
105
106			optional<int> AudioOutputDevice::ParameterSampleRate::RangeMaxAsInt(std::map<String,String> Parameters) {
107			return optional<int>::nothing;
108			}
109
110			std::vector<int> AudioOutputDevice::ParameterSampleRate::PossibilitiesAsInt(std::map<String,String> Parameters) {
111			return std::vector<int>();
112			}
113
114	schoenebeck	1607	int AudioOutputDevice::ParameterSampleRate::ValueAsInt() {
115			return (pDevice) ? (int) ((AudioOutputDevice*)pDevice)->SampleRate()
116			: DeviceCreationParameterInt::ValueAsInt();
117			}
118
119	schoenebeck	880	void AudioOutputDevice::ParameterSampleRate::OnSetValue(int i) throw (Exception) {
120	schoenebeck	226	/* cannot happen, as parameter is fix */
121			}
122
123			String AudioOutputDevice::ParameterSampleRate::Name() {
124			return "SAMPLERATE";
125			}
126
127
128
129			// ************* ParameterChannels *************
130			// *
131
132			AudioOutputDevice::ParameterChannels::ParameterChannels() : DeviceCreationParameterInt() {
133			InitWithDefault();
134			}
135
136			AudioOutputDevice::ParameterChannels::ParameterChannels(String s) : DeviceCreationParameterInt(s) {
137			}
138
139			String AudioOutputDevice::ParameterChannels::Description() {
140			return "Number of output channels";
141			}
142
143			bool AudioOutputDevice::ParameterChannels::Fix() {
144			return false;
145			}
146
147			bool AudioOutputDevice::ParameterChannels::Mandatory() {
148			return false;
149			}
150
151			std::map<String,DeviceCreationParameter*> AudioOutputDevice::ParameterChannels::DependsAsParameters() {
152			return std::map<String,DeviceCreationParameter*>();
153			}
154
155			optional<int> AudioOutputDevice::ParameterChannels::DefaultAsInt(std::map<String,String> Parameters) {
156			return 2;
157			}
158
159			optional<int> AudioOutputDevice::ParameterChannels::RangeMinAsInt(std::map<String,String> Parameters) {
160	iliev	1305	return 1;
161	schoenebeck	226	}
162
163			optional<int> AudioOutputDevice::ParameterChannels::RangeMaxAsInt(std::map<String,String> Parameters) {
164	schoenebeck	1599	return optional<int>::nothing;
165	schoenebeck	226	}
166
167			std::vector<int> AudioOutputDevice::ParameterChannels::PossibilitiesAsInt(std::map<String,String> Parameters) {
168			return std::vector<int>();
169			}
170
171	schoenebeck	880	void AudioOutputDevice::ParameterChannels::OnSetValue(int i) throw (Exception) {
172	schoenebeck	226	((AudioOutputDevice*)pDevice)->AcquireChannels(i);
173			}
174
175			String AudioOutputDevice::ParameterChannels::Name() {
176			return "CHANNELS";
177			}
178
179
180
181			// ************* AudioOutputDevice *************
182			// *
183
184	persson	846	AudioOutputDevice::AudioOutputDevice(std::map<String,DeviceCreationParameter*> DriverParameters)
185			: EnginesReader(Engines) {
186	schoenebeck	200	this->Parameters = DriverParameters;
187	schoenebeck	2135	EffectChainIDs = new IDGenerator();
188	schoenebeck	200	}
189
190			AudioOutputDevice::~AudioOutputDevice() {
191	schoenebeck	226	// delete all audio channels
192			{
193			std::vector<AudioChannel*>::iterator iter = Channels.begin();
194			while (iter != Channels.end()) {
195			delete *iter;
196			iter++;
197			}
198	persson	836	Channels.clear();
199	schoenebeck	200	}
200	schoenebeck	226
201			// delete all device parameters
202			{
203			std::map<String,DeviceCreationParameter*>::iterator iter = Parameters.begin();
204			while (iter != Parameters.end()) {
205			delete iter->second;
206			iter++;
207			}
208	persson	835	Parameters.clear();
209	schoenebeck	226	}
210	schoenebeck	1722
211			// delete all master effect chains
212			{
213			std::vector<EffectChain*>::iterator iter = vEffectChains.begin();
214			while (iter != vEffectChains.end()) {
215			delete *iter;
216			iter++;
217			}
218			vEffectChains.clear();
219			}
220	schoenebeck	2135
221			delete EffectChainIDs;
222	schoenebeck	200	}
223
224	schoenebeck	412	void AudioOutputDevice::Connect(Engine* pEngine) {
225	persson	840	std::set<Engine*>& engines = Engines.GetConfigForUpdate();
226			if (engines.find(pEngine) == engines.end()) {
227			engines.insert(pEngine);
228			Engines.SwitchConfig().insert(pEngine);
229	schoenebeck	412	// make sure the engine knows about the connection
230			//pEngine->Connect(this);
231	schoenebeck	200	}
232			}
233
234	schoenebeck	412	void AudioOutputDevice::Disconnect(Engine* pEngine) {
235	persson	840	std::set<Engine*>& engines = Engines.GetConfigForUpdate();
236			if (engines.find(pEngine) != engines.end()) { // if clause to prevent disconnect loop
237			engines.erase(pEngine);
238			Engines.SwitchConfig().erase(pEngine);
239	schoenebeck	412	// make sure the engine knows about the disconnection
240			//pEngine->DisconnectAudioOutputDevice();
241	schoenebeck	200	}
242			}
243
244			AudioChannel* AudioOutputDevice::Channel(uint ChannelIndex) {
245			return (ChannelIndex < Channels.size()) ? Channels[ChannelIndex] : NULL;
246			}
247
248	schoenebeck	226	void AudioOutputDevice::AcquireChannels(uint Channels) {
249			if (Channels > this->Channels.size()) {
250			for (int c = this->Channels.size(); c < Channels; c++) {
251			this->Channels.push_back(CreateChannel(c));
252			}
253			}
254			}
255
256	schoenebeck	1001	uint AudioOutputDevice::ChannelCount() {
257			return Channels.size();
258			}
259
260	schoenebeck	200	std::map<String,DeviceCreationParameter*> AudioOutputDevice::DeviceParameters() {
261			return Parameters;
262			}
263
264	schoenebeck	2137	EffectChain* AudioOutputDevice::AddSendEffectChain() {
265	schoenebeck	2135	EffectChain* pChain = new EffectChain(this, EffectChainIDs->create());
266	schoenebeck	1722	vEffectChains.push_back(pChain);
267			return pChain;
268			}
269
270	schoenebeck	2137	void AudioOutputDevice::RemoveSendEffectChain(uint iChain) throw (Exception) {
271	schoenebeck	1722	if (iChain >= vEffectChains.size())
272			throw Exception(
273	iliev	2198	"Could not remove send effect chain " + ToString(iChain) +
274	schoenebeck	1722	", index out of bounds"
275			);
276			std::vector<EffectChain*>::iterator iter = vEffectChains.begin();
277			for (int i = 0; i < iChain; ++i) ++iter;
278	schoenebeck	2135	EffectChainIDs->destroy((*iter)->ID());
279	schoenebeck	1722	vEffectChains.erase(iter);
280			}
281
282	schoenebeck	2137	EffectChain* AudioOutputDevice::SendEffectChain(uint iChain) const {
283	schoenebeck	1722	if (iChain >= vEffectChains.size()) return NULL;
284			return vEffectChains[iChain];
285			}
286
287	iliev	2198	EffectChain* AudioOutputDevice::SendEffectChainByID(uint iChainID) const {
288			for (int i = 0; i < SendEffectChainCount(); i++) {
289			if (SendEffectChain(i)->ID() == iChainID) return SendEffectChain(i);
290			}
291
292			return NULL;
293			}
294
295	schoenebeck	2137	uint AudioOutputDevice::SendEffectChainCount() const {
296	schoenebeck	1722	return vEffectChains.size();
297			}
298
299	schoenebeck	2137	// TODO: to be removed
300			EffectChain* AudioOutputDevice::AddMasterEffectChain() {
301			return AddSendEffectChain();
302			}
303
304			// TODO: to be removed
305			void AudioOutputDevice::RemoveMasterEffectChain(uint iChain) throw (Exception) {
306			RemoveSendEffectChain(iChain);
307			}
308
309			// TODO: to be removed
310			EffectChain* AudioOutputDevice::MasterEffectChain(uint iChain) const {
311			return SendEffectChain(iChain);
312			}
313
314			// TODO: to be removed
315			uint AudioOutputDevice::MasterEffectChainCount() const {
316			return SendEffectChainCount();
317			}
318
319	schoenebeck	200	int AudioOutputDevice::RenderAudio(uint Samples) {
320			if (Channels.empty()) return 0;
321
322			// reset all channels with silence
323			{
324			std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
325			std::vector<AudioChannel*>::iterator end = Channels.end();
326			for (; iterChannels != end; iterChannels++)
327	persson	1748	(*iterChannels)->Clear(Samples); // zero out audio buffer
328	schoenebeck	200	}
329	schoenebeck	1722	// do the same for master effects
330			{
331			std::vector<EffectChain*>::iterator iterChains = vEffectChains.begin();
332			std::vector<EffectChain*>::iterator end = vEffectChains.end();
333			for (; iterChains != end; ++iterChains)
334			(*iterChains)->ClearAllChannels(); // zero out audio buffers
335			}
336	schoenebeck	200
337			int result = 0;
338
339			// let all connected engines render audio for the current audio fragment cycle
340	persson	846	const std::set<Engine*>& engines = EnginesReader.Lock();
341	schoenebeck	554	#if CONFIG_RT_EXCEPTIONS
342	schoenebeck	272	try
343	schoenebeck	554	#endif // CONFIG_RT_EXCEPTIONS
344	schoenebeck	200	{
345	persson	840	std::set<Engine*>::iterator iterEngine = engines.begin();
346			std::set<Engine*>::iterator end = engines.end();
347	schoenebeck	412	for (; iterEngine != end; iterEngine++) {
348			int res = (*iterEngine)->RenderAudio(Samples);
349	schoenebeck	200	if (res != 0) result = res;
350			}
351			}
352	schoenebeck	554	#if CONFIG_RT_EXCEPTIONS
353	schoenebeck	272	catch (std::runtime_error se) {
354			std::cerr << "std::runtime_error: " << se.what() << std::endl << std::flush;
355			exit(EXIT_FAILURE);
356			}
357	schoenebeck	554	#endif // CONFIG_RT_EXCEPTIONS
358	schoenebeck	1722	EnginesReader.Unlock();
359	schoenebeck	200
360	schoenebeck	1722	// now that the engines (might) have left fx send signals for master
361			// effects, render all master effects
362			{
363			std::vector<EffectChain*>::iterator iterChains = vEffectChains.begin();
364			std::vector<EffectChain*>::iterator end = vEffectChains.end();
365			for (; iterChains != end; ++iterChains) {
366			if (!(*iterChains)->EffectCount()) continue;
367			(*iterChains)->RenderAudio(Samples);
368			// mix the result of the last effect in the chain to the audio
369			// output device channel(s)
370			Effect* pLastEffect =
371			(iterChains)->GetEffect((iterChains)->EffectCount() - 1);
372			for (int iChan = 0; iChan < pLastEffect->OutputChannelCount() && iChan < ChannelCount(); ++iChan)
373			pLastEffect->OutputChannel(iChan)->MixTo(Channel(iChan), Samples);
374			}
375			}
376
377	schoenebeck	200	return result;
378			}
379
380			int AudioOutputDevice::RenderSilence(uint Samples) {
381			if (Channels.empty()) return 0;
382
383			// reset all channels with silence
384			{
385			std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
386			std::vector<AudioChannel*>::iterator end = Channels.end();
387			for (; iterChannels != end; iterChannels++)
388	persson	1748	(*iterChannels)->Clear(Samples); // zero out audio buffer
389	schoenebeck	200	}
390
391			return 0;
392			}
393
394			} // namespace LinuxSampler