author | František Kučera <franta-hg@frantovo.cz> |
Thu, 01 Oct 2020 00:15:50 +0200 | |
branch | v_0 |
changeset 6 | 4174fc0c2e7c |
parent 5 | 6be3464ccb2b |
child 7 | b2fc99295546 |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2018 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 <iostream> |
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#include <sstream> |
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#include <locale> |
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#include <codecvt> |
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#include <sys/mman.h> |
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#include <signal.h> |
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#include <unistd.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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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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std::atomic<bool> continueProcessing{true}; |
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const int RING_BUFFER_SIZE = 100; |
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struct MidiMessage { |
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uint8_t buffer[4096]; |
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uint32_t size; |
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uint32_t time; |
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}; |
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/** |
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* The message being prepared before enqueing in the ringBuffer. |
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* Not the message dequeued from the ringBuffer (different thread). |
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*/ |
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MidiMessage currentMidiMessage; |
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size_t currentAttributeCount = 0; |
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size_t currentAttributeIndex = 0; |
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public: |
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JackHandler(Configuration& configuration) : configuration(configuration) { |
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// Initialize JACK connection: |
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std::string clientName = convertor.to_bytes(configuration.jackClientName); |
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jackClient = jack_client_open(clientName.c_str(), JackNullOption, nullptr); |
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if (jackClient == nullptr) throw JackException(L"Could not create JACK client."); |
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ringBuffer = jack_ringbuffer_create(RING_BUFFER_SIZE * sizeof (MidiMessage)); |
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jack_set_process_callback(jackClient, relpipe::out::jack::dequeueMessages, this); |
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// TODO: report also other events (connections etc.) |
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jackPort = jack_port_register(jackClient, "output", JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0); |
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if (jackPort == nullptr) throw JackException(L"Could not register port."); |
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if (mlockall(MCL_CURRENT | MCL_FUTURE)) fwprintf(stderr, L"Warning: Can not lock memory.\n"); |
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int jackError = jack_activate(jackClient); |
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if (jackError) throw JackException(L"Could not activate client."); |
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// Wait for a port connection, because it does not make much sense to send MIDI events nowhere: |
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// TODO: configurable waiting? |
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while (jack_port_connected(jackPort) == 0) usleep(10000); |
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} |
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void startRelation(const relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override { |
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// TODO: validate metadata and prepare attribute mappings (names and types are important, order does not matter) |
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currentAttributeCount = attributes.size(); |
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} |
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void attribute(const relpipe::common::type::StringX& value) override { |
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// TODO: append to current message + if this is last attribute, put whole message to the ring buffer |
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// TODO: if (continueProcessing) {} ? |
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if (currentAttributeIndex < currentAttributeCount) { |
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// memcpy(currentMidiMessage.buffer, ….buffer, ….size); |
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// currentMidiMessage.size = …; |
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// currentMidiMessage.time = …; |
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// TODO: correct timing? |
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// TODO: real data |
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currentMidiMessage.size = 3; |
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currentMidiMessage.buffer[0] = 0x80; |
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currentMidiMessage.buffer[1] = 0x34; |
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currentMidiMessage.buffer[2] = 0x40; |
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currentAttributeIndex++; |
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} else { |
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if (jack_ringbuffer_write_space(ringBuffer) >= sizeof (MidiMessage)) { |
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jack_ringbuffer_write(ringBuffer, (const char *) ¤tMidiMessage, sizeof (MidiMessage)); |
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} else { |
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fwprintf(stderr, L"Error: ring buffer is full → skipping event.\n"); |
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} |
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currentMidiMessage = MidiMessage(); |
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currentAttributeIndex = 0; |
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} |
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} |
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void endOfPipe() { |
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// TODO: send optional (configurable) MIDI events |
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// Wait until the ring buffer is empty |
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while (continueProcessing && jack_ringbuffer_read_space(ringBuffer)) usleep(1000); |
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} |
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146 |
|
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147 |
int dequeueMessages(jack_nframes_t frames) { |
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148 |
const size_t queuedMessages = jack_ringbuffer_read_space(ringBuffer) / sizeof (MidiMessage); |
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149 |
for (size_t i = 0; i < queuedMessages && i < frames; i++) { |
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150 |
// TODO: correct timing? |
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151 |
MidiMessage m; |
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152 |
jack_ringbuffer_read(ringBuffer, (char*) &m, sizeof (MidiMessage)); |
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153 |
void* jackPortBuffer = jack_port_get_buffer(jackPort, frames); |
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154 |
jack_midi_data_t* midiData = jack_midi_event_reserve(jackPortBuffer, m.time, m.size); |
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155 |
memcpy(midiData, m.buffer, m.size); |
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156 |
} |
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157 |
return 0; |
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158 |
} |
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159 |
|
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160 |
void finish(int sig) { |
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161 |
continueProcessing = false; |
0 | 162 |
} |
163 |
||
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164 |
virtual ~JackHandler() { |
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165 |
// Close JACK connection: |
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166 |
jack_deactivate(jackClient); |
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jack_client_close(jackClient); |
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jack_ringbuffer_free(ringBuffer); |
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169 |
} |
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170 |
|
0 | 171 |
}; |
172 |
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173 |
int dequeueMessages(jack_nframes_t frames, void* arg) { |
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174 |
JackHandler* instance = (JackHandler*) arg; |
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175 |
return instance->dequeueMessages(frames); |
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176 |
} |
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177 |
|
0 | 178 |
} |
179 |
} |
|
180 |
} |