hostplugins/lv2/PluginLv2.cpp

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2008 Andreas Persson                                    *
 *                                                                         *
 *   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 <algorithm>
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <string>

#include "PluginLv2.h"

#define NS_ATOM "http://lv2plug.in/ns/ext/atom#"
#define NS_LS   "http://linuxsampler.org/schema#"

namespace {

    PluginLv2::PluginLv2(const LV2_Descriptor* Descriptor,
                         double SampleRate, const char* BundlePath,
                         const LV2_Feature* const* Features) {
        Out[0] = 0;
        Out[1] = 0;
        UriMap = 0;
        MapPath = 0;
        MakePath = 0;
        for (int i = 0 ; Features[i] ; i++) {
            dmsg(2, ("linuxsampler: init feature: %s\n", Features[i]->URI));
            if (!strcmp(Features[i]->URI, LV2_URI_MAP_URI)) {
                UriMap = (LV2_URI_Map_Feature*)Features[i]->data;
            } else if (!strcmp(Features[i]->URI, LV2_STATE_MAP_PATH_URI)) {
                MapPath = (LV2_State_Map_Path*)Features[i]->data;
            } else if (!strcmp(Features[i]->URI, LV2_STATE_MAKE_PATH_URI)) {
                MakePath = (LV2_State_Make_Path*)Features[i]->data;
            }
        }

        Init(SampleRate, 128);

        InitState();

        DefaultState = GetState();
    }

    void PluginLv2::ConnectPort(uint32_t Port, void* DataLocation) {
        if (Port == 2) {
            MidiBuf = static_cast<LV2_Event_Buffer*>(DataLocation);
        } else if (Port < 2) {
            Out[Port] = static_cast<float*>(DataLocation);
        }
    }

    void PluginLv2::Activate() {
        dmsg(2, ("linuxsampler: Activate\n"));
    }

    void PluginLv2::Run(uint32_t SampleCount) {
        int samplePos = 0;
        uint8_t* events = MidiBuf->data;
        int eventCount = MidiBuf->event_count;
        while (SampleCount) {
            int samples = std::min(SampleCount, 128U);

            for ( ; eventCount ; eventCount--) {
                LV2_Event* event = reinterpret_cast<LV2_Event*>(events);

                int time = event->frames - samplePos;
                if (time >= samples) break;

                uint8_t* data = events + sizeof(LV2_Event);
                events += (sizeof(LV2_Event) + event->size + 7) & ~7;

                pMidiDevice->Port()->DispatchRaw(data, time);
            }
            pAudioDevice->Channel(0)->SetBuffer(Out[0] + samplePos);
            pAudioDevice->Channel(1)->SetBuffer(Out[1] + samplePos);
            pAudioDevice->Render(samples);

            samplePos += samples;
            SampleCount -= samples;
        }
    }

    void PluginLv2::Deactivate() {
        dmsg(2, ("linuxsampler: Deactivate\n"));
    }

    String PluginLv2::PathToState(const String& path) {
        if (MapPath) {
            char* cstr = MapPath->abstract_path(MapPath->handle, path.c_str());
            const String abstract_path(cstr);
            free(cstr);
            return abstract_path;
        }
        return path;
    }

    String PluginLv2::PathFromState(const String& path) {
        if (MapPath) {
            char* cstr = MapPath->absolute_path(MapPath->handle, path.c_str());
            const String abstract_path(cstr);
            free(cstr);
            return abstract_path;
        }
        return path;
    }

    void PluginLv2::SetStateFeatures(const LV2_Feature* const* Features)
    {
        for (int i = 0 ; Features[i] ; i++) {
            dmsg(2, ("linuxsampler: state feature: %s\n", Features[i]->URI));
            if (!strcmp(Features[i]->URI, LV2_STATE_MAP_PATH_URI)) {
                MapPath = (LV2_State_Map_Path*)Features[i]->data;
            } else if (!strcmp(Features[i]->URI, LV2_STATE_MAKE_PATH_URI)) {
                MakePath = (LV2_State_Make_Path*)Features[i]->data;
            }
        }
    }

    void PluginLv2::Save(LV2_State_Store_Function store, LV2_State_Handle handle,
                         uint32_t flags, const LV2_Feature* const* features)
    {
        LV2_State_Map_Path*  OldMapPath  = MapPath;
        LV2_State_Make_Path* OldMakePath = MakePath;
        SetStateFeatures(features);

        if (MakePath && MapPath) {
            char* abs_path = MakePath->path(MakePath->handle, "linuxsampler");
            dmsg(2, ("saving to file %s\n", abs_path));

            std::ofstream out(abs_path);
            out << GetState();

            char* path = MapPath->abstract_path(MapPath->handle, abs_path);

            store(handle,
                  uri_to_id(NULL, NS_LS "state-file"),
                  path,
                  strlen(path) + 1,
                  uri_to_id(NULL, LV2_STATE_PATH_URI),
                  LV2_STATE_IS_PORTABLE);

            free(path);
            free(abs_path);
        } else {
            dmsg(2, ("saving to string\n"));

            std::ostringstream out;
            out << GetState();

            store(handle,
                  uri_to_id(NULL, NS_LS "state-string"),
                  out.str().c_str(),
                  out.str().length() + 1,
                  uri_to_id(NULL, NS_ATOM "String"),
                  LV2_STATE_IS_POD | LV2_STATE_IS_PORTABLE);
        }
        dmsg(2, ("saving done\n"));

        MapPath  = OldMapPath;
        MakePath = OldMakePath;
    }

    void PluginLv2::Restore(LV2_State_Retrieve_Function retrieve, LV2_State_Handle handle,
                            uint32_t rflags, const LV2_Feature* const* features)
    {
        LV2_State_Map_Path*  OldMapPath  = MapPath;
        LV2_State_Make_Path* OldMakePath = MakePath;
        SetStateFeatures(features);

        size_t   size;
        uint32_t type;
        uint32_t flags;

        // Attempt to restore from state-file
        const void* value = retrieve(
            handle,
            uri_to_id(NULL, NS_LS "state-file"),
            &size, &type, &flags);
        if (value) {
            assert(type == uri_to_id(NULL, LV2_STATE_PATH_URI));
            const String path((const char*)value);
            dmsg(2, ("linuxsampler: restoring from file %s\n", path.c_str()));
            std::ifstream in(path.c_str());
            String state;
            std::getline(in, state, '\0');
            SetState(state);
            return;
        }

        // Attempt to restore from state-string
        value = retrieve(
                handle,
                uri_to_id(NULL, NS_LS "state-string"),
                &size, &type, &flags);
        if (value) {
            dmsg(2, ("linuxsampler: restoring from string\n"));
            assert(type == uri_to_id(NULL, NS_ATOM "String"));
            String state((const char*)value);
            SetState(state);
            return;
        }

        // No valid state found, reset to default state
        dmsg(2, ("linuxsampler: restoring default state\n"));
        SetState(DefaultState);

        MapPath  = OldMapPath;
        MakePath = OldMakePath;
    }

    LV2_Handle instantiate(const LV2_Descriptor* descriptor,
                           double sample_rate, const char* bundle_path,
                           const LV2_Feature* const* features) {
        return new PluginLv2(descriptor, sample_rate, bundle_path, features);
    }

    void connect_port(LV2_Handle instance, uint32_t port, void* data_location) {
        static_cast<PluginLv2*>(instance)->ConnectPort(port, data_location);
    }

    void activate(LV2_Handle instance) {
        static_cast<PluginLv2*>(instance)->Activate();
    }

    void run(LV2_Handle instance, uint32_t sample_count) {
        static_cast<PluginLv2*>(instance)->Run(sample_count);
    }

    void deactivate(LV2_Handle instance) {
        static_cast<PluginLv2*>(instance)->Deactivate();
    }

    void cleanup(LV2_Handle instance) {
        delete static_cast<PluginLv2*>(instance);
    }

    void save(LV2_Handle handle, LV2_State_Store_Function store,
              LV2_State_Handle state,
              uint32_t flags, const LV2_Feature* const* features) {
        return static_cast<PluginLv2*>(handle)->Save(
            store, state, flags, features);
    }

    void restore(LV2_Handle handle, LV2_State_Retrieve_Function retrieve,
                 LV2_State_Handle state,
                 uint32_t flags, const LV2_Feature* const* features) {
        return static_cast<PluginLv2*>(handle)->Restore(
            retrieve, state, flags, features);
    }

    PluginInfo PluginInfo::Instance;

    PluginInfo::PluginInfo() {
        Lv2.URI = "http://linuxsampler.org/plugins/linuxsampler";
        Lv2.activate = activate;
        Lv2.cleanup = cleanup;
        Lv2.connect_port = connect_port;
        Lv2.deactivate = deactivate;
        Lv2.instantiate = instantiate;
        Lv2.run = run;
        Lv2.extension_data = extension_data;
        StateInterface.save = save;
        StateInterface.restore = restore;
    }


    const void* extension_data(const char* uri) {
        dmsg(2, ("linuxsampler: extension_data %s\n", uri));
        if (strcmp(uri, LV2_STATE_URI "#Interface") == 0) {
            return PluginInfo::Lv2StateInterface();
        }
        return 0;
    }
}


extern "C" {
    LV2_SYMBOL_EXPORT
    const LV2_Descriptor* lv2_descriptor(uint32_t index) {
        return index == 0 ? PluginInfo::Lv2Descriptor() : 0;
    }
}
1	/***************************************************************************
2	* *
3	* Copyright (C) 2008 Andreas Persson *
4	* *
5	* This program is free software; you can redistribute it and/or modify *
6	* it under the terms of the GNU General Public License as published by *
7	* the Free Software Foundation; either version 2 of the License, or *
8	* (at your option) any later version. *
9	* *
10	* This program is distributed in the hope that it will be useful, *
11	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13	* GNU General Public License for more details. *
14	* *
15	* You should have received a copy of the GNU General Public License *
16	* along with this program; if not, write to the Free Software *
17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
18	* MA 02110-1301 USA *
19	***************************************************************************/
20
21	#include <algorithm>
22	#include <cassert>
23	#include <cstdio>
24	#include <cstdlib>
25	#include <cstring>
26	#include <fstream>
27	#include <string>
28
29	#include "PluginLv2.h"
30
31	#define NS_ATOM "http://lv2plug.in/ns/ext/atom#"
32	#define NS_LS "http://linuxsampler.org/schema#"
33
34	namespace {
35
36	PluginLv2::PluginLv2(const LV2_Descriptor* Descriptor,
37	double SampleRate, const char* BundlePath,
38	const LV2_Feature* const* Features) {
39	Out[0] = 0;
40	Out[1] = 0;
41	UriMap = 0;
42	MapPath = 0;
43	MakePath = 0;
44	for (int i = 0 ; Features[i] ; i++) {
45	dmsg(2, ("linuxsampler: init feature: %s\n", Features[i]->URI));
46	if (!strcmp(Features[i]->URI, LV2_URI_MAP_URI)) {
47	UriMap = (LV2_URI_Map_Feature*)Features[i]->data;
48	} else if (!strcmp(Features[i]->URI, LV2_STATE_MAP_PATH_URI)) {
49	MapPath = (LV2_State_Map_Path*)Features[i]->data;
50	} else if (!strcmp(Features[i]->URI, LV2_STATE_MAKE_PATH_URI)) {
51	MakePath = (LV2_State_Make_Path*)Features[i]->data;
52	}
53	}
54
55	Init(SampleRate, 128);
56
57	InitState();
58
59	DefaultState = GetState();
60	}
61
62	void PluginLv2::ConnectPort(uint32_t Port, void* DataLocation) {
63	if (Port == 2) {
64	MidiBuf = static_cast<LV2_Event_Buffer*>(DataLocation);
65	} else if (Port < 2) {
66	Out[Port] = static_cast<float*>(DataLocation);
67	}
68	}
69
70	void PluginLv2::Activate() {
71	dmsg(2, ("linuxsampler: Activate\n"));
72	}
73
74	void PluginLv2::Run(uint32_t SampleCount) {
75	int samplePos = 0;
76	uint8_t* events = MidiBuf->data;
77	int eventCount = MidiBuf->event_count;
78	while (SampleCount) {
79	int samples = std::min(SampleCount, 128U);
80
81	for ( ; eventCount ; eventCount--) {
82	LV2_Event* event = reinterpret_cast<LV2_Event*>(events);
83
84	int time = event->frames - samplePos;
85	if (time >= samples) break;
86
87	uint8_t* data = events + sizeof(LV2_Event);
88	events += (sizeof(LV2_Event) + event->size + 7) & ~7;
89
90	pMidiDevice->Port()->DispatchRaw(data, time);
91	}
92	pAudioDevice->Channel(0)->SetBuffer(Out[0] + samplePos);
93	pAudioDevice->Channel(1)->SetBuffer(Out[1] + samplePos);
94	pAudioDevice->Render(samples);
95
96	samplePos += samples;
97	SampleCount -= samples;
98	}
99	}
100
101	void PluginLv2::Deactivate() {
102	dmsg(2, ("linuxsampler: Deactivate\n"));
103	}
104
105	String PluginLv2::PathToState(const String& path) {
106	if (MapPath) {
107	char* cstr = MapPath->abstract_path(MapPath->handle, path.c_str());
108	const String abstract_path(cstr);
109	free(cstr);
110	return abstract_path;
111	}
112	return path;
113	}
114
115	String PluginLv2::PathFromState(const String& path) {
116	if (MapPath) {
117	char* cstr = MapPath->absolute_path(MapPath->handle, path.c_str());
118	const String abstract_path(cstr);
119	free(cstr);
120	return abstract_path;
121	}
122	return path;
123	}
124
125	void PluginLv2::SetStateFeatures(const LV2_Feature* const* Features)
126	{
127	for (int i = 0 ; Features[i] ; i++) {
128	dmsg(2, ("linuxsampler: state feature: %s\n", Features[i]->URI));
129	if (!strcmp(Features[i]->URI, LV2_STATE_MAP_PATH_URI)) {
130	MapPath = (LV2_State_Map_Path*)Features[i]->data;
131	} else if (!strcmp(Features[i]->URI, LV2_STATE_MAKE_PATH_URI)) {
132	MakePath = (LV2_State_Make_Path*)Features[i]->data;
133	}
134	}
135	}
136
137	void PluginLv2::Save(LV2_State_Store_Function store, LV2_State_Handle handle,
138	uint32_t flags, const LV2_Feature* const* features)
139	{
140	LV2_State_Map_Path* OldMapPath = MapPath;
141	LV2_State_Make_Path* OldMakePath = MakePath;
142	SetStateFeatures(features);
143
144	if (MakePath && MapPath) {
145	char* abs_path = MakePath->path(MakePath->handle, "linuxsampler");
146	dmsg(2, ("saving to file %s\n", abs_path));
147
148	std::ofstream out(abs_path);
149	out << GetState();
150
151	char* path = MapPath->abstract_path(MapPath->handle, abs_path);
152
153	store(handle,
154	uri_to_id(NULL, NS_LS "state-file"),
155	path,
156	strlen(path) + 1,
157	uri_to_id(NULL, LV2_STATE_PATH_URI),
158	LV2_STATE_IS_PORTABLE);
159
160	free(path);
161	free(abs_path);
162	} else {
163	dmsg(2, ("saving to string\n"));
164
165	std::ostringstream out;
166	out << GetState();
167
168	store(handle,
169	uri_to_id(NULL, NS_LS "state-string"),
170	out.str().c_str(),
171	out.str().length() + 1,
172	uri_to_id(NULL, NS_ATOM "String"),
173	LV2_STATE_IS_POD \| LV2_STATE_IS_PORTABLE);
174	}
175	dmsg(2, ("saving done\n"));
176
177	MapPath = OldMapPath;
178	MakePath = OldMakePath;
179	}
180
181	void PluginLv2::Restore(LV2_State_Retrieve_Function retrieve, LV2_State_Handle handle,
182	uint32_t rflags, const LV2_Feature* const* features)
183	{
184	LV2_State_Map_Path* OldMapPath = MapPath;
185	LV2_State_Make_Path* OldMakePath = MakePath;
186	SetStateFeatures(features);
187
188	size_t size;
189	uint32_t type;
190	uint32_t flags;
191
192	// Attempt to restore from state-file
193	const void* value = retrieve(
194	handle,
195	uri_to_id(NULL, NS_LS "state-file"),
196	&size, &type, &flags);
197	if (value) {
198	assert(type == uri_to_id(NULL, LV2_STATE_PATH_URI));
199	const String path((const char*)value);
200	dmsg(2, ("linuxsampler: restoring from file %s\n", path.c_str()));
201	std::ifstream in(path.c_str());
202	String state;
203	std::getline(in, state, '\0');
204	SetState(state);
205	return;
206	}
207
208	// Attempt to restore from state-string
209	value = retrieve(
210	handle,
211	uri_to_id(NULL, NS_LS "state-string"),
212	&size, &type, &flags);
213	if (value) {
214	dmsg(2, ("linuxsampler: restoring from string\n"));
215	assert(type == uri_to_id(NULL, NS_ATOM "String"));
216	String state((const char*)value);
217	SetState(state);
218	return;
219	}
220
221	// No valid state found, reset to default state
222	dmsg(2, ("linuxsampler: restoring default state\n"));
223	SetState(DefaultState);
224
225	MapPath = OldMapPath;
226	MakePath = OldMakePath;
227	}
228
229	LV2_Handle instantiate(const LV2_Descriptor* descriptor,
230	double sample_rate, const char* bundle_path,
231	const LV2_Feature* const* features) {
232	return new PluginLv2(descriptor, sample_rate, bundle_path, features);
233	}
234
235	void connect_port(LV2_Handle instance, uint32_t port, void* data_location) {
236	static_cast<PluginLv2*>(instance)->ConnectPort(port, data_location);
237	}
238
239	void activate(LV2_Handle instance) {
240	static_cast<PluginLv2*>(instance)->Activate();
241	}
242
243	void run(LV2_Handle instance, uint32_t sample_count) {
244	static_cast<PluginLv2*>(instance)->Run(sample_count);
245	}
246
247	void deactivate(LV2_Handle instance) {
248	static_cast<PluginLv2*>(instance)->Deactivate();
249	}
250
251	void cleanup(LV2_Handle instance) {
252	delete static_cast<PluginLv2*>(instance);
253	}
254
255	void save(LV2_Handle handle, LV2_State_Store_Function store,
256	LV2_State_Handle state,
257	uint32_t flags, const LV2_Feature* const* features) {
258	return static_cast<PluginLv2*>(handle)->Save(
259	store, state, flags, features);
260	}
261
262	void restore(LV2_Handle handle, LV2_State_Retrieve_Function retrieve,
263	LV2_State_Handle state,
264	uint32_t flags, const LV2_Feature* const* features) {
265	return static_cast<PluginLv2*>(handle)->Restore(
266	retrieve, state, flags, features);
267	}
268
269	PluginInfo PluginInfo::Instance;
270
271	PluginInfo::PluginInfo() {
272	Lv2.URI = "http://linuxsampler.org/plugins/linuxsampler";
273	Lv2.activate = activate;
274	Lv2.cleanup = cleanup;
275	Lv2.connect_port = connect_port;
276	Lv2.deactivate = deactivate;
277	Lv2.instantiate = instantiate;
278	Lv2.run = run;
279	Lv2.extension_data = extension_data;
280	StateInterface.save = save;
281	StateInterface.restore = restore;
282	}
283
284
285	const void* extension_data(const char* uri) {
286	dmsg(2, ("linuxsampler: extension_data %s\n", uri));
287	if (strcmp(uri, LV2_STATE_URI "#Interface") == 0) {
288	return PluginInfo::Lv2StateInterface();
289	}
290	return 0;
291	}
292	}
293
294
295	extern "C" {
296	LV2_SYMBOL_EXPORT
297	const LV2_Descriptor* lv2_descriptor(uint32_t index) {
298	return index == 0 ? PluginInfo::Lv2Descriptor() : 0;
299	}
300	}