author | František Kučera <franta-hg@frantovo.cz> |
Sun, 11 Oct 2020 17:41:53 +0200 | |
branch | v_0 |
changeset 25 | e0627da77dad |
parent 24 | 427b8d799a4a |
child 27 | 45a1742b9854 |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <memory> |
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#include <atomic> |
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#include <string> |
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#include <cstring> |
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#include <vector> |
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#include <codecvt> |
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#include <sys/mman.h> |
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#include <unistd.h> |
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#include <pthread.h> |
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#include <jack/jack.h> |
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#include <jack/midiport.h> |
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#include <jack/ringbuffer.h> |
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#include <relpipe/common/type/typedefs.h> |
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#include <relpipe/reader/TypeId.h> |
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#include <relpipe/reader/handlers/RelationalReaderStringHandler.h> |
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#include <relpipe/reader/handlers/AttributeMetadata.h> |
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#include "Configuration.h" |
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#include "JackException.h" |
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namespace relpipe { |
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namespace out { |
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namespace jack { |
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int dequeueMessages(jack_nframes_t frames, void* arg); |
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class JackHandler : public relpipe::reader::handlers::RelationalReaderStringHandler { |
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private: |
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Configuration& configuration; |
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std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: local system encoding |
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std::atomic<bool> continueProcessing{true}; |
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/** |
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* Is passed through the ring buffer |
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* from the relpipe-reading thread to the jack-writing thread (callback). |
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*/ |
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struct MidiMessage { |
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uint8_t buffer[4096] = {0}; |
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size_t size; |
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jack_nframes_t time; |
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}; |
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/** |
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* JACK callbacks (called from the real-time thread) |
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*/ |
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class RealTimeContext { |
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public: |
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jack_client_t* jackClient = nullptr; |
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jack_port_t* jackPort = nullptr; |
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jack_ringbuffer_t* ringBuffer = nullptr; |
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pthread_mutex_t processingLock = PTHREAD_MUTEX_INITIALIZER; |
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pthread_cond_t processingDone = PTHREAD_COND_INITIALIZER; |
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const int RING_BUFFER_SIZE = 100; |
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int processCallback(jack_nframes_t frames) { |
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const size_t queuedMessages = jack_ringbuffer_read_space(ringBuffer) / sizeof (MidiMessage); |
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void* jackPortBuffer = jack_port_get_buffer(jackPort, frames); // jack_port_get_buffer() must be called outside the loop, otherwise it will multiply the MIDI events |
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jack_midi_clear_buffer(jackPortBuffer); // TODO: clean buffer? |
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for (size_t i = 0; i < queuedMessages && i < frames; i++) { |
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// TODO: correct timing? |
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MidiMessage m; |
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jack_ringbuffer_read(ringBuffer, (char*) &m, sizeof (MidiMessage)); |
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jack_midi_data_t* midiData = jack_midi_event_reserve(jackPortBuffer, m.time, m.size); |
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if (midiData) memcpy(midiData, m.buffer, m.size); |
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else /* error: not enough space TODO: store and send later */; |
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} |
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if (pthread_mutex_trylock(&processingLock) == 0) { |
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pthread_cond_signal(&processingDone); |
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pthread_mutex_unlock(&processingLock); |
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} |
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return 0; |
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} |
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int syncCallback(jack_transport_state_t state, jack_position_t* position) { |
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return true; |
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} |
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static int processCallback(jack_nframes_t frames, void* instance) { |
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return static_cast<RealTimeContext*> (instance)->processCallback(frames); |
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} |
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static int syncCallback(jack_transport_state_t state, jack_position_t* position, void* instance) { |
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return static_cast<RealTimeContext*> (instance)->syncCallback(state, position); |
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} |
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} realTimeContext; |
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/** |
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* Temporary storage of values read from relational input. |
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*/ |
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class RelationContext { |
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public: |
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bool skip = false; |
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std::vector<relpipe::reader::handlers::AttributeMetadata> attributes; |
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bool hasAttribute(const relpipe::common::type::StringX& name) { |
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for (auto a : attributes) if (a.getAttributeName() == name) return true; |
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return false; |
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} |
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class RecordContext { |
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public: |
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enum class Event { |
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NOTE, |
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CONTROL, |
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SYSEX, |
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CONNECT, |
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DISCONNECT, |
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UNKNOWN |
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}; |
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static Event parseEventType(const relpipe::common::type::StringX& name) { |
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if (name == L"note") return Event::NOTE; |
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else if (name == L"control") return Event::CONTROL; |
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else if (name == L"sysex") return Event::SYSEX; |
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else if (name == L"connect") return Event::CONNECT; |
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else if (name == L"disconnect") return Event::DISCONNECT; |
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else return Event::UNKNOWN; |
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} |
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Event event = Event::UNKNOWN; |
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relpipe::common::type::Integer channel; |
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relpipe::common::type::Boolean noteOn; |
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relpipe::common::type::Integer notePitch; |
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relpipe::common::type::Integer noteVelocity; |
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relpipe::common::type::Integer controllerId; |
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relpipe::common::type::Integer controllerValue; |
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relpipe::common::type::StringX raw; |
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relpipe::common::type::StringX connectionSourcePort; |
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relpipe::common::type::StringX connectionDestinationPort; |
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size_t attributeIndex = 0; |
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160 |
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161 |
} recordContext; |
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162 |
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163 |
} relationContext; |
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164 |
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static void jackErrorCallback(const char * message) { |
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std::wstring_convert < std::codecvt_utf8<wchar_t>> convertor; // TODO: local system encoding |
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std::wcerr << L"JACK: " << convertor.from_bytes(message) << std::endl; |
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} |
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169 |
|
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void finalize() { |
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// Close JACK connection: |
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jack_deactivate(realTimeContext.jackClient); |
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jack_client_close(realTimeContext.jackClient); |
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jack_ringbuffer_free(realTimeContext.ringBuffer); |
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pthread_mutex_unlock(&realTimeContext.processingLock); |
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} |
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177 |
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void failInConstructor(const relpipe::common::type::StringX& errorMessage) { |
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finalize(); |
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throw JackException(errorMessage); |
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181 |
} |
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182 |
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/** |
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* Wait for the signal that is emitted at the end of the real-time processCallback() cycle. |
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*/ |
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void waitForRTCycle() { |
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pthread_cond_wait(&realTimeContext.processingDone, &realTimeContext.processingLock); |
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} |
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0 | 190 |
public: |
191 |
||
192 |
JackHandler(Configuration& configuration) : configuration(configuration) { |
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pthread_mutex_lock(&realTimeContext.processingLock); |
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194 |
|
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// Initialize JACK connection: |
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std::string clientName = convertor.to_bytes(configuration.client); |
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realTimeContext.jackClient = jack_client_open(clientName.c_str(), JackNullOption, nullptr); |
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if (realTimeContext.jackClient == nullptr) failInConstructor(L"Could not create JACK client."); |
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199 |
|
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200 |
realTimeContext.ringBuffer = jack_ringbuffer_create(realTimeContext.RING_BUFFER_SIZE * sizeof (MidiMessage)); |
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201 |
|
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jack_set_process_callback(realTimeContext.jackClient, RealTimeContext::processCallback, &realTimeContext); |
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jack_set_sync_callback(realTimeContext.jackClient, RealTimeContext::syncCallback, &realTimeContext); |
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// TODO: report also other events (connections etc.) |
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jack_set_error_function(jackErrorCallback); |
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jack_set_info_function(jackErrorCallback); |
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207 |
|
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208 |
realTimeContext.jackPort = jack_port_register(realTimeContext.jackClient, convertor.to_bytes(configuration.port).c_str(), JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0); |
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if (realTimeContext.jackPort == nullptr) failInConstructor(L"Could not register the JACK port."); |
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210 |
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211 |
if (mlockall(MCL_CURRENT | MCL_FUTURE)) fwprintf(stderr, L"Warning: Can not lock memory.\n"); |
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212 |
|
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213 |
int jackError = jack_activate(realTimeContext.jackClient); |
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214 |
if (jackError) failInConstructor(L"Could not activate the JACK client."); |
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215 |
|
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216 |
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217 |
// Connect to configured destination ports: |
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218 |
const char* jackPortName = jack_port_name(realTimeContext.jackPort); |
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219 |
for (auto destinationPort : configuration.connectTo) { |
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220 |
int error = jack_connect(realTimeContext.jackClient, jackPortName, convertor.to_bytes(destinationPort).c_str()); |
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221 |
if (error) failInConstructor(L"Connection to the JACK port failed: " + destinationPort); |
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222 |
} |
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223 |
|
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224 |
// Wait for a port connection, because it does not make much sense to send MIDI events nowhere: |
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225 |
while (jack_port_connected(realTimeContext.jackPort) < configuration.requiredConnections) usleep(10000); |
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226 |
|
0 | 227 |
} |
228 |
||
229 |
void startRelation(const relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override { |
|
10 | 230 |
relationContext = RelationContext(); |
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231 |
relationContext.attributes = attributes; |
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232 |
|
10 | 233 |
// TODO: configurable relation name |
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|
234 |
|
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235 |
if (!relationContext.hasAttribute(L"event")) { |
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236 |
relationContext.skip = true; |
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fwprintf(stderr, L"Relation „%ls“ will be ignored because mandatory attribute „event“ is missing.\n", name.c_str()); |
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238 |
} |
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239 |
|
0 | 240 |
} |
241 |
||
242 |
void attribute(const relpipe::common::type::StringX& value) override { |
|
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|
243 |
if (relationContext.skip) return; |
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244 |
// TODO: switch to RelationalReaderValueHandler |
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245 |
|
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246 |
RelationContext& rel = relationContext; |
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RelationContext::RecordContext& rec = rel.recordContext; |
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|
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249 |
const auto attributeName = rel.attributes[rec.attributeIndex].getAttributeName(); |
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250 |
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251 |
if (attributeName == L"event") rec.event = rec.parseEventType(value); |
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252 |
else if (attributeName == L"channel") rec.channel = std::stoi(value); |
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253 |
else if (attributeName == L"controller_id") rec.controllerId = std::stoi(value); |
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254 |
else if (attributeName == L"controller_value") rec.controllerValue = std::stoi(value); |
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255 |
else if (attributeName == L"note_on") rec.noteOn = value == L"true"; |
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256 |
else if (attributeName == L"note_pitch") rec.notePitch = std::stoi(value); |
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257 |
else if (attributeName == L"note_velocity") rec.noteVelocity = std::stoi(value); |
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258 |
else if (attributeName == L"raw") rec.raw = value; |
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259 |
else if (attributeName == L"source_port") rec.connectionSourcePort = value; |
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260 |
else if (attributeName == L"destination_port") rec.connectionDestinationPort = value; |
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|
261 |
|
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262 |
rec.attributeIndex++; |
10 | 263 |
|
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264 |
if (rec.attributeIndex == rel.attributes.size()) { |
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265 |
|
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266 |
while (continueProcessing && jack_ringbuffer_write_space(realTimeContext.ringBuffer) < sizeof (MidiMessage)) waitForRTCycle(); // should not happen, the real-time thread should be faster; see also note in endOfPipe() |
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267 |
if (!continueProcessing) return; |
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268 |
|
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269 |
MidiMessage m; |
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270 |
|
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271 |
// TODO: correct timing? |
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272 |
m.time = 0; |
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m.size = 0; |
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274 |
|
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if (rec.event == RelationContext::RecordContext::Event::NOTE) { |
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m.size = 3; |
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m.buffer[0] = (rec.noteOn ? 0x90 : 0x80) | rec.channel; |
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m.buffer[1] = rec.notePitch; |
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m.buffer[2] = rec.noteVelocity; |
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} else if (rec.event == RelationContext::RecordContext::Event::CONTROL) { |
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m.size = 3; |
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m.buffer[0] = 0xB0 | rec.channel; |
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m.buffer[1] = rec.controllerId; |
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m.buffer[2] = rec.controllerValue; |
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} else if (rec.event == RelationContext::RecordContext::Event::CONNECT) { |
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int result = jack_connect(realTimeContext.jackClient, convertor.to_bytes(rec.connectionSourcePort).c_str(), convertor.to_bytes(rec.connectionDestinationPort).c_str()); |
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if (result != 0 && result != EEXIST) std::wcerr << L"Unable to connect: „" << rec.connectionSourcePort << L"“ to: „" << rec.connectionDestinationPort << L"“." << std::endl; |
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} else if (rec.event == RelationContext::RecordContext::Event::DISCONNECT) { |
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int result = jack_disconnect(realTimeContext.jackClient, convertor.to_bytes(rec.connectionSourcePort).c_str(), convertor.to_bytes(rec.connectionDestinationPort).c_str()); |
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if (result != 0) std::wcerr << L"Unable to disconnect: „" << rec.connectionSourcePort << L"“ from: „" << rec.connectionDestinationPort << L"“." << std::endl; |
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} else { // SysEx and other raw messages |
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size_t nibble = 0; |
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for (int i = 0; i < rec.raw.size() && m.size < sizeof (m.buffer); i++) { |
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wchar_t ch = rec.raw[i]; |
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295 |
|
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if (ch == L' ') continue; |
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else if (ch >= L'0' && ch <= L'9') m.buffer[m.size] += (ch - '0') /**/ << (nibble % 2 ? 0 : 4); |
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else if (ch >= L'a' && ch <= L'f') m.buffer[m.size] += (ch - 'a' + 10) << (nibble % 2 ? 0 : 4); |
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else if (ch >= L'A' && ch <= L'F') m.buffer[m.size] += (ch - 'A' + 10) << (nibble % 2 ? 0 : 4); |
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else throw JackException(L"Invalid character in the hexadeximal sequence: „" + std::wstring(1, ch) + L"“."); |
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301 |
|
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nibble++; |
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if (nibble % 2 == 0) m.size++; |
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304 |
} |
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305 |
} |
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306 |
|
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if (m.size > 0) jack_ringbuffer_write(realTimeContext.ringBuffer, (const char *) &m, sizeof (m)); |
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|
10 | 309 |
relationContext.recordContext = RelationContext::RecordContext(); |
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} |
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|
0 | 312 |
} |
313 |
||
314 |
void endOfPipe() { |
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315 |
// TODO: optionally mute all; probably enabled by default |
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316 |
|
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// Wait until the ring buffer is empty (messages dequeued from the buffer) and real-time cycle was finished (messages passed to JACK) |
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while (continueProcessing && jack_ringbuffer_read_space(realTimeContext.ringBuffer)) pthread_cond_wait(&realTimeContext.processingDone, &realTimeContext.processingLock); |
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319 |
|
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// There might be a (rare) race condition. |
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321 |
// Between jack_ringbuffer_read_space() and pthread_cond_wait() the real-time thread might finish the cycle and we will miss the pthread_cond_signal() |
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// and will sleep until the next cycle. In endOfPipe() it is not a big problem. |
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// But missing the cycle in attribute() might be worse. |
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// However it should not happen due to the buffer size |
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325 |
// and amount of work done in the real-time thread (message copying) vs. amount of work done between the jack_ringbuffer_write_space() and pthread_cond_wait() calls (nothing). |
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326 |
} |
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327 |
|
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328 |
void finish(int sig) { |
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continueProcessing = false; |
0 | 330 |
} |
331 |
||
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virtual ~JackHandler() { |
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333 |
finalize(); |
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334 |
} |
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335 |
|
0 | 336 |
}; |
337 |
||
338 |
} |
|
339 |
} |
|
340 |
} |