diff VamPipePluginLibrary.cpp @ 0:c226df029ac8

Start on plugin-library-to-json-request-response-handler adapter

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/VamPipePluginLibrary.cpp	Mon Aug 22 17:17:28 2016 +0100
@@ -0,0 +1,279 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    VamPipe
+
+    Centre for Digital Music, Queen Mary, University of London.
+    Copyright 2015-2016 QMUL.
+  
+    Permission is hereby granted, free of charge, to any person
+    obtaining a copy of this software and associated documentation
+    files (the "Software"), to deal in the Software without
+    restriction, including without limitation the rights to use, copy,
+    modify, merge, publish, distribute, sublicense, and/or sell copies
+    of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
+    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+    Except as contained in this notice, the names of the Centre for
+    Digital Music; Queen Mary, University of London; and Chris Cannam
+    shall not be used in advertising or otherwise to promote the sale,
+    use or other dealings in this Software without prior written
+    authorization.
+*/
+
+#include "VamPipePluginLibrary.h"
+#include "VamPipeAdapter.h"
+#include "json/VampJson.h"
+
+using namespace std;
+using namespace json11;
+
+namespace vampipe {
+
+//!!! too many explicit namespaces here
+
+//!!! dup with vampipe-convert
+static Json
+convertRequestJson(string input)
+{
+    string err;
+    Json j = Json::parse(input, err);
+    if (err != "") {
+	throw VampJson::Failure("invalid json: " + err);
+    }
+    if (!j.is_object()) {
+	throw VampJson::Failure("object expected at top level");
+    }
+    if (!j["type"].is_string()) {
+	throw VampJson::Failure("string expected for type field");
+    }
+    if (!j["content"].is_object()) {
+	throw VampJson::Failure("object expected for content field");
+    }
+    return j;
+}
+
+VamPipePluginLibrary::VamPipePluginLibrary(vector<VamPipeAdapterBase *> pp)
+{
+    for (VamPipeAdapterBase *p: pp) {
+	string key = p->getStaticData().pluginKey;
+	m_adapters[key] = p;
+    }
+}
+
+RequestOrResponse
+VamPipePluginLibrary::readRequest(string req) const
+{
+    RequestOrResponse rr;
+    rr.direction = RequestOrResponse::Request;
+
+    //!!! todo: handle exceptions (can't pass through C abi)
+    Json j = convertRequestJson(req);
+
+    //!!! reduce, reduce
+    rr.type = VampJson::getRequestResponseType(j);
+
+    switch (rr.type) {
+
+    case RRType::List:
+	VampJson::toVampRequest_List(j); // type check only
+	break;
+    case RRType::Load:
+	rr.loadRequest = VampJson::toVampRequest_Load(j);
+	break;
+    case RRType::Configure:
+	rr.configurationRequest = VampJson::toVampRequest_Configure(j, m_mapper);
+	break;
+    case RRType::Process:
+	rr.processRequest = VampJson::toVampRequest_Process(j, m_mapper);
+	break;
+    case RRType::Finish:
+	rr.finishPlugin = VampJson::toVampRequest_Finish(j, m_mapper);
+	break;
+    case RRType::NotValid:
+	break;
+    }
+
+    return rr;
+}
+
+string
+VamPipePluginLibrary::writeResponse(const RequestOrResponse &rr) const
+{
+    Json j;
+
+    switch (rr.type) {
+
+    case RRType::List:
+	j = VampJson::fromVampResponse_List("", rr.listResponse);
+	break;
+    case RRType::Load:
+	j = VampJson::fromVampResponse_Load(rr.loadResponse, m_mapper);
+	break;
+    case RRType::Configure:
+	j = VampJson::fromVampResponse_Configure(rr.configurationResponse);
+	break;
+    case RRType::Process:
+	j = VampJson::fromVampResponse_Process(rr.processResponse);
+	break;
+    case RRType::Finish:
+	j = VampJson::fromVampResponse_Finish(rr.finishResponse);
+	break;
+    case RRType::NotValid:
+	break;
+    }
+
+    return j.dump();
+}
+
+vector<Vamp::HostExt::PluginStaticData>
+VamPipePluginLibrary::listPluginData() const
+{
+    vector<Vamp::HostExt::PluginStaticData> data;
+    for (auto a: m_adapters) {
+	data.push_back(a.second->getStaticData());
+    }
+    return data;
+}
+
+Vamp::HostExt::LoadResponse
+VamPipePluginLibrary::loadPlugin(Vamp::HostExt::LoadRequest req) const
+{
+    string key = req.pluginKey;
+    if (m_adapters.find(key) != m_adapters.end()) {
+	return m_adapters.at(key)->loadPlugin(req);
+    } else {
+	throw runtime_error("no adapter for plugin key " + key);
+    }
+}
+
+Vamp::HostExt::ConfigurationResponse
+VamPipePluginLibrary::configurePlugin(Vamp::HostExt::ConfigurationRequest req) const
+{
+    for (Vamp::HostExt::PluginConfiguration::ParameterMap::const_iterator i =
+             req.configuration.parameterValues.begin();
+         i != req.configuration.parameterValues.end(); ++i) {
+        req.plugin->setParameter(i->first, i->second);
+    }
+
+    if (req.configuration.currentProgram != "") {
+        req.plugin->selectProgram(req.configuration.currentProgram);
+    }
+
+    Vamp::HostExt::ConfigurationResponse response;
+
+    if (req.plugin->initialise(req.configuration.channelCount,
+                               req.configuration.stepSize,
+                               req.configuration.blockSize)) {
+        response.outputs = req.plugin->getOutputDescriptors();
+    }
+
+    return response;
+}
+
+string
+VamPipePluginLibrary::requestJsonImpl(string req)
+{
+    RequestOrResponse request = readRequest(req);
+
+    RequestOrResponse response;
+    response.direction = RequestOrResponse::Response;
+    response.type = request.type;
+
+    switch (request.type) {
+
+    case RRType::List:
+	response.listResponse = listPluginData();
+	response.success = true;
+	break;
+
+    case RRType::Load:
+	response.loadResponse = loadPlugin(request.loadRequest);
+	if (response.loadResponse.plugin) {
+	    m_mapper.addPlugin(response.loadResponse.plugin);
+	    response.success = true;
+	}
+	break;
+	
+    case RRType::Configure:
+    {
+	auto &creq = request.configurationRequest;
+	auto h = m_mapper.pluginToHandle(creq.plugin);
+	if (m_mapper.isConfigured(h)) {
+	    //!!! again, can't return through C abi
+	    throw runtime_error("plugin has already been configured");
+	}
+
+	response.configurationResponse = configurePlugin(creq);
+	
+	if (!response.configurationResponse.outputs.empty()) {
+	    m_mapper.markConfigured
+		(h, creq.configuration.channelCount, creq.configuration.blockSize);
+	    response.success = true;
+	}
+	break;
+    }
+
+    case RRType::Process:
+    {
+	auto &preq = request.processRequest;
+	auto h = m_mapper.pluginToHandle(preq.plugin);
+	if (!m_mapper.isConfigured(h)) {
+	    throw runtime_error("plugin has not been configured");
+	}
+
+	int channels = int(preq.inputBuffers.size());
+	if (channels != m_mapper.getChannelCount(h)) {
+	    throw runtime_error("wrong number of channels supplied to process");
+	}
+		
+	const float **fbuffers = new const float *[channels];
+	for (int i = 0; i < channels; ++i) {
+	    if (int(preq.inputBuffers[i].size()) != m_mapper.getBlockSize(h)) {
+		delete[] fbuffers;
+		throw runtime_error("wrong block size supplied to process");
+	    }
+	    fbuffers[i] = preq.inputBuffers[i].data();
+	}
+
+	response.processResponse.features =
+	    preq.plugin->process(fbuffers, preq.timestamp);
+	response.success = true;
+
+	delete[] fbuffers;
+	break;
+    }
+
+    case RRType::Finish:
+    {
+	auto h = m_mapper.pluginToHandle(request.finishPlugin);
+
+	response.finishResponse.features =
+	    request.finishPlugin->getRemainingFeatures();
+	    
+	m_mapper.removePlugin(h);
+	delete request.finishPlugin;
+	response.success = true;
+	break;
+    }
+
+    case RRType::NotValid:
+	break;
+    }
+    
+    return writeResponse(response);
+}
+
+}
+