mirror of
https://github.com/ZDoom/ZMusic.git
synced 2024-11-15 00:41:36 +00:00
- updated the Alsa MIDI device.
Not tested yet.
This commit is contained in:
Christoph Oelckers
parent
b415394560
commit
463cd4e0c5
3 changed files with 239 additions and 151 deletions
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@ -34,13 +34,9 @@
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#if defined __linux__ && defined HAVE_SYSTEM_MIDI
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#include <algorithm>
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#include <memory>
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#include <assert.h>
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#include <thread>
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#include <pthread.h>
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#include <atomic>
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#include <cstring>
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#include <mutex>
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#include <condition_variable>
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#include "mididevice.h"
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#include "zmusic/m_swap.h"
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@ -51,10 +47,28 @@
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namespace {
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enum class EventType {
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Null,
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Delay,
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Action
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};
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struct EventState {
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int ticks = 0;
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snd_seq_event_t data;
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int size_of = 0;
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void Clear() {
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ticks = 0;
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snd_seq_ev_clear(&data);
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size_of = 0;
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}
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};
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class AlsaMIDIDevice : public MIDIDevice
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{
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public:
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AlsaMIDIDevice(int dev_id);
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AlsaMIDIDevice(int dev_id, int (*printfunc_)(const char *, ...));
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~AlsaMIDIDevice();
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int Open() override;
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void Close() override;
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@ -83,15 +97,16 @@ public:
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return true;
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}
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void HandleTempoChange(int tick, int tempo);
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void HandleEvent(int tick, int status, int parm1, int parm2);
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void HandleLongEvent(int tick, const uint8_t *data, int len);
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void SendStopEvents();
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void SetExit(bool exit);
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bool WaitForExit(std::chrono::microseconds usec, snd_seq_queue_status_t * status);
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EventType PullEvent(EventState & state);
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void PumpEvents();
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protected:
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AlsaSequencer &sequencer;
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int (*printfunc)(const char*, ...);
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MidiHeader *Events = nullptr;
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bool Started = false;
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@ -104,22 +119,26 @@ protected:
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int DestinationClientId;
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int DestinationPortId;
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int Technology;
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int Tempo = 480000;
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int TimeDiv = 480;
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std::thread PlayerThread;
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std::atomic<bool> Exit;
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bool Exit = false;
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std::mutex ExitLock;
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std::condition_variable ExitCond;
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};
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}
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AlsaMIDIDevice::AlsaMIDIDevice(int dev_id) : sequencer(AlsaSequencer::Get())
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AlsaMIDIDevice::AlsaMIDIDevice(int dev_id, int (*printfunc_)(const char*, ...) = nullptr) : sequencer(AlsaSequencer::Get()), printfunc(printfunc_)
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{
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auto & internalDevices = sequencer.GetInternalDevices();
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auto & device = internalDevices.at(dev_id);
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DestinationClientId = device.ClientID;
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DestinationPortId = device.PortNumber;
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Technology = device.GetDeviceClass();
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}
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AlsaMIDIDevice::~AlsaMIDIDevice()
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@ -185,8 +204,7 @@ bool AlsaMIDIDevice::IsOpen() const
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int AlsaMIDIDevice::GetTechnology() const
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{
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// TODO: implement properly, for now assume everything is an external MIDI device
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return MIDIDEV_MIDIPORT;
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return Technology;
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}
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int AlsaMIDIDevice::SetTempo(int tempo)
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@ -201,192 +219,248 @@ int AlsaMIDIDevice::SetTimeDiv(int timediv)
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return 0;
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}
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void AlsaMIDIDevice::HandleEvent(int tick, int status, int parm1, int parm2)
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{
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int command = status & 0xF0;
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int channel = status & 0x0F;
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EventType AlsaMIDIDevice::PullEvent(EventState & state) {
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state.Clear();
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snd_seq_event_t ev;
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snd_seq_ev_clear(&ev);
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snd_seq_ev_set_source(&ev, PortId);
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snd_seq_ev_set_subs(&ev);
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snd_seq_ev_schedule_tick(&ev, QueueId, false, tick);
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switch (command)
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if(!Events) {
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Callback(CallbackData);
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if(!Events) {
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return EventType::Null;
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}
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}
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if (Position >= Events->dwBytesRecorded)
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{
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case MIDI_NOTEOFF:
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snd_seq_ev_set_noteoff(&ev, channel, parm1, parm2);
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break;
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Events = Events->lpNext;
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Position = 0;
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case MIDI_NOTEON:
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snd_seq_ev_set_noteon(&ev, channel, parm1, parm2);
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break;
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case MIDI_POLYPRESS:
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// FIXME: Seems to be missing in the Alsa sequencer implementation
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return;
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case MIDI_CTRLCHANGE:
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snd_seq_ev_set_controller(&ev, channel, parm1, parm2);
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break;
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case MIDI_PRGMCHANGE:
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snd_seq_ev_set_pgmchange(&ev, channel, parm1);
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break;
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case MIDI_CHANPRESS:
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snd_seq_ev_set_chanpress(&ev, channel, parm1);
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break;
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case MIDI_PITCHBEND: {
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long bend = ((long)parm1 + (long)(parm2 << 7)) - 0x2000;
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snd_seq_ev_set_pitchbend(&ev, channel, bend);
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break;
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if (Callback != NULL)
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{
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Callback(CallbackData);
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}
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if(!Events) {
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return EventType::Null;
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}
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}
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default:
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return;
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uint32_t *event = (uint32_t *)(Events->lpData + Position);
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state.ticks = event[0];
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// Advance to next event.
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if (event[2] < 0x80000000)
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{ // Short message
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state.size_of = 12;
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}
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snd_seq_event_output(sequencer.handle, &ev);
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else
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{ // Long message
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state.size_of = 12 + ((MEVENT_EVENTPARM(event[2]) + 3) & ~3);
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}
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if (MEVENT_EVENTTYPE(event[2]) == MEVENT_TEMPO) {
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int tempo = MEVENT_EVENTPARM(event[2]);
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if(Tempo != tempo) {
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Tempo = tempo;
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snd_seq_change_queue_tempo(sequencer.handle, QueueId, Tempo, &state.data);
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return EventType::Action;
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}
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}
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else if (MEVENT_EVENTTYPE(event[2]) == MEVENT_LONGMSG) {
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// SysEx messages...
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uint8_t * data = (uint8_t *)&event[3];
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int len = MEVENT_EVENTPARM(event[2]);
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if (len > 1 && (data[0] == 0xF0 || data[0] == 0xF7))
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{
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snd_seq_ev_set_sysex(&state.data, len, (void *)data);
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return EventType::Action;
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}
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}
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else if (MEVENT_EVENTTYPE(event[2]) == 0) {
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// Short MIDI event
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int command = event[2] & 0xF0;
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int channel = event[2] & 0x0F;
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int parm1 = (event[2] >> 8) & 0x7f;
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int parm2 = (event[2] >> 16) & 0x7f;
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switch (command)
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{
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case MIDI_NOTEOFF:
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snd_seq_ev_set_noteoff(&state.data, channel, parm1, parm2);
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return EventType::Action;
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case MIDI_NOTEON:
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snd_seq_ev_set_noteon(&state.data, channel, parm1, parm2);
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return EventType::Action;
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case MIDI_POLYPRESS:
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// FIXME: Seems to be missing in the Alsa sequencer implementation
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break;
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case MIDI_CTRLCHANGE:
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snd_seq_ev_set_controller(&state.data, channel, parm1, parm2);
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return EventType::Action;
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case MIDI_PRGMCHANGE:
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snd_seq_ev_set_pgmchange(&state.data, channel, parm1);
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return EventType::Action;
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case MIDI_CHANPRESS:
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snd_seq_ev_set_chanpress(&state.data, channel, parm1);
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return EventType::Action;
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case MIDI_PITCHBEND: {
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long bend = ((long)parm1 + (long)(parm2 << 7)) - 0x2000;
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snd_seq_ev_set_pitchbend(&state.data, channel, bend);
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return EventType::Action;
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}
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default:
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break;
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}
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}
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// We didn't really recognize the event, treat it as a delay
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return EventType::Delay;
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}
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void AlsaMIDIDevice::HandleLongEvent(int tick, const uint8_t *data, int len)
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{
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// SysEx messages...
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if (len > 1 && (data[0] == 0xF0 || data[0] == 0xF7))
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{
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snd_seq_event_t ev;
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snd_seq_ev_clear(&ev);
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snd_seq_ev_set_source(&ev, PortId);
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snd_seq_ev_set_subs(&ev);
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snd_seq_ev_schedule_tick(&ev, QueueId, false, tick);
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snd_seq_ev_set_sysex(&ev, len, (void *)data);
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snd_seq_event_output(sequencer.handle, &ev);
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void AlsaMIDIDevice::SetExit(bool exit) {
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std::unique_lock<std::mutex> lock(ExitLock);
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if(exit != Exit) {
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Exit = exit;
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ExitCond.notify_all();
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}
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}
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void AlsaMIDIDevice::HandleTempoChange(int tick, int tempo) {
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if(Tempo != tempo) {
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Tempo = tempo;
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snd_seq_event_t ev;
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snd_seq_ev_clear(&ev);
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snd_seq_ev_set_source(&ev, PortId);
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snd_seq_ev_set_subs(&ev);
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snd_seq_ev_schedule_tick(&ev, QueueId, false, tick);
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snd_seq_change_queue_tempo(sequencer.handle, QueueId, Tempo, &ev);
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snd_seq_event_output(sequencer.handle, &ev);
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bool AlsaMIDIDevice::WaitForExit(std::chrono::microseconds usec, snd_seq_queue_status_t * status) {
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std::unique_lock<std::mutex> lock(ExitLock);
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if(Exit) {
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return true;
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}
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ExitCond.wait_for(lock, usec);
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if(Exit) {
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return true;
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}
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snd_seq_get_queue_status(sequencer.handle, QueueId, status);
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return false;
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}
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/*
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* Pumps events from the input to the output in a worker thread.
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* It tries to keep the amount of events (time-wise) in the ALSA sequencer queue to be between 40 and 80ms by sleeping where necessary.
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* This means Alsa can play them safely without running out of things to do, and we have good control over the events themselves (volume, pause, etc.).
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*/
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void AlsaMIDIDevice::PumpEvents() {
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int error = 0;
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const std::chrono::microseconds pump_step(40000);
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// TODO: fill in error handling throughout this.
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snd_seq_queue_tempo_t *tempo;
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snd_seq_queue_tempo_alloca(&tempo);
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snd_seq_queue_tempo_set_tempo(tempo, Tempo);
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snd_seq_queue_tempo_set_ppq(tempo, TimeDiv);
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error = snd_seq_set_queue_tempo(sequencer.handle, QueueId, tempo);
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snd_seq_set_queue_tempo(sequencer.handle, QueueId, tempo);
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snd_seq_start_queue(sequencer.handle, QueueId, NULL);
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error = snd_seq_drain_output(sequencer.handle);
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snd_seq_drain_output(sequencer.handle);
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int running_time = 0;
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while (!Exit) {
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if(!Events) {
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// NOTE: in practice, this is never reached. however, if it were, it would prevent crashes below.
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int buffer_ticks = 0;
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EventState event;
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snd_seq_queue_status_t *status;
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snd_seq_queue_status_malloc(&status);
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while (true) {
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auto type = PullEvent(event);
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// if we reach the end of events, await our doom at a steady rate while looking for more events
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if(type == EventType::Null) {
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if(WaitForExit(pump_step, status)) {
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break;
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}
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continue;
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}
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uint32_t *event = (uint32_t *)(Events->lpData + Position);
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int ticks = event[0];
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running_time += ticks;
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if (MEVENT_EVENTTYPE(event[2]) == MEVENT_TEMPO) {
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HandleTempoChange(running_time, MEVENT_EVENTPARM(event[2]));
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}
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else if (MEVENT_EVENTTYPE(event[2]) == MEVENT_LONGMSG) {
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HandleLongEvent(running_time, (uint8_t *)&event[3], MEVENT_EVENTPARM(event[2]));
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}
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else if (MEVENT_EVENTTYPE(event[2]) == 0) {
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// Short MIDI event
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int status = event[2] & 0xff;
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int parm1 = (event[2] >> 8) & 0x7f;
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int parm2 = (event[2] >> 16) & 0x7f;
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HandleEvent(running_time, status, parm1, parm2);
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// chomp delays as they come...
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if(type == EventType::Delay) {
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buffer_ticks += event.ticks;
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Position += event.size_of;
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continue;
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}
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// Advance to next event.
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if (event[2] < 0x80000000)
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{ // Short message
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Position += 12;
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}
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else
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{ // Long message
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Position += 12 + ((MEVENT_EVENTPARM(event[2]) + 3) & ~3);
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}
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// Did we use up this buffer?
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if (Position >= Events->dwBytesRecorded)
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{
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Events = Events->lpNext;
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Position = 0;
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if (Callback != NULL)
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{
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Callback(CallbackData);
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// Figure out if we should sleep (the event is too far in the future for us to care), and for how long
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int next_event_tick = buffer_ticks + event.ticks;
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int queue_tick = snd_seq_queue_status_get_tick_time(status);
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int tick_delta = next_event_tick - queue_tick;
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auto usecs = std::chrono::microseconds(tick_delta * Tempo / TimeDiv);
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auto schedule_time = std::max(std::chrono::microseconds(0), usecs - pump_step);
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if(schedule_time >= pump_step) {
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if(WaitForExit(schedule_time, status)) {
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break;
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}
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snd_seq_drain_output(sequencer.handle);
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snd_seq_sync_output_queue(sequencer.handle);
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continue;
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}
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if (tick_delta < 0) {
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if(printfunc) {
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printfunc("Alsa sequencer underrun: %d ticks!\n", tick_delta);
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}
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}
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// We found an event worthy of sending to the sequencer
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snd_seq_ev_set_source(&event.data, PortId);
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snd_seq_ev_set_subs(&event.data);
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snd_seq_ev_schedule_tick(&event.data, QueueId, false, buffer_ticks + event.ticks);
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int result = snd_seq_event_output(sequencer.handle, &event.data);
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if(result < 0) {
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if(printfunc) {
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printfunc("Alsa sequencer did not accept event: error %d!\n", result);
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}
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if(WaitForExit(pump_step, status)) {
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break;
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}
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continue;
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}
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buffer_ticks += event.ticks;
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Position += event.size_of;
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snd_seq_drain_output(sequencer.handle);
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}
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// Send stop events, just to be sure we don't end up with stuck notes
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snd_seq_queue_status_free(status);
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snd_seq_drop_output(sequencer.handle);
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// FIXME: the event source should give use these, but it doesn't.
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{
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snd_seq_drop_output(sequencer.handle);
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SendStopEvents();
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// FIXME: attach to a timestamped event and make it go through the queue?
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snd_seq_stop_queue(sequencer.handle, QueueId, NULL);
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for (int channel = 0; channel < 16; ++channel)
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{
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snd_seq_event_t ev;
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snd_seq_ev_clear(&ev);
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snd_seq_ev_set_source(&ev, PortId);
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snd_seq_ev_set_subs(&ev);
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snd_seq_ev_schedule_tick(&ev, QueueId, true, 0);
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snd_seq_ev_set_controller(&ev, channel, MIDI_CTL_ALL_NOTES_OFF, 0);
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snd_seq_event_output(sequencer.handle, &ev);
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snd_seq_ev_set_controller(&ev, channel, MIDI_CTL_RESET_CONTROLLERS, 0);
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snd_seq_event_output(sequencer.handle, &ev);
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}
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snd_seq_drain_output(sequencer.handle);
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snd_seq_sync_output_queue(sequencer.handle);
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}
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snd_seq_sync_output_queue(sequencer.handle);
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snd_seq_stop_queue(sequencer.handle, QueueId, NULL);
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snd_seq_drain_output(sequencer.handle);
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}
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void AlsaMIDIDevice::SendStopEvents() {
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// NOTE: for some reason, the midi streamer doesn't send us these.
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for (int channel = 0; channel < 16; ++channel)
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{
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snd_seq_event_t ev;
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snd_seq_ev_clear(&ev);
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snd_seq_ev_set_source(&ev, PortId);
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snd_seq_ev_set_subs(&ev);
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snd_seq_ev_schedule_tick(&ev, QueueId, true, 0);
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snd_seq_ev_set_controller(&ev, channel, MIDI_CTL_ALL_NOTES_OFF, 0);
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snd_seq_event_output(sequencer.handle, &ev);
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||||
snd_seq_ev_set_controller(&ev, channel, MIDI_CTL_RESET_CONTROLLERS, 0);
|
||||
snd_seq_event_output(sequencer.handle, &ev);
|
||||
}
|
||||
snd_seq_drain_output(sequencer.handle);
|
||||
snd_seq_sync_output_queue(sequencer.handle);
|
||||
}
|
||||
|
||||
int AlsaMIDIDevice::Resume()
|
||||
{
|
||||
if(!Connected) {
|
||||
return 1;
|
||||
}
|
||||
Exit = false;
|
||||
SetExit(false);
|
||||
PlayerThread = std::thread(&AlsaMIDIDevice::PumpEvents, this);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void AlsaMIDIDevice::InitPlayback()
|
||||
{
|
||||
Exit = false;
|
||||
SetExit(false);
|
||||
}
|
||||
|
||||
void AlsaMIDIDevice::Stop()
|
||||
{
|
||||
/*
|
||||
* NOTE: this is slow. Maybe we should just leave the thread be and let it asynchronously drain in the background.
|
||||
*/
|
||||
Exit = true;
|
||||
SetExit(true);
|
||||
PlayerThread.join();
|
||||
}
|
||||
|
||||
|
|
@ -429,6 +503,6 @@ bool AlsaMIDIDevice::Update()
|
|||
|
||||
MIDIDevice *CreateAlsaMIDIDevice(int mididevice)
|
||||
{
|
||||
return new AlsaMIDIDevice(mididevice);
|
||||
return new AlsaMIDIDevice(mididevice, musicCallbacks.Alsa_MessageFunc);
|
||||
}
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -37,6 +37,18 @@
|
|||
#include <alsa/asoundlib.h>
|
||||
#include <sstream>
|
||||
|
||||
EMidiDeviceClass MidiOutDeviceInternal::GetDeviceClass() const
|
||||
{
|
||||
if (type & SND_SEQ_PORT_TYPE_SYNTH)
|
||||
return MIDIDEV_FMSYNTH;
|
||||
if (type & (SND_SEQ_PORT_TYPE_DIRECT_SAMPLE|SND_SEQ_PORT_TYPE_SAMPLE))
|
||||
return MIDIDEV_SYNTH;
|
||||
if (type & (SND_SEQ_PORT_TYPE_MIDI_GENERIC|SND_SEQ_PORT_TYPE_APPLICATION))
|
||||
return MIDIDEV_MIDIPORT;
|
||||
// assume FM synth otherwise
|
||||
return MIDIDEV_FMSYNTH;
|
||||
}
|
||||
|
||||
AlsaSequencer & AlsaSequencer::Get() {
|
||||
static AlsaSequencer sequencer;
|
||||
return sequencer;
|
||||
|
|
@ -51,7 +63,7 @@ AlsaSequencer::~AlsaSequencer() {
|
|||
}
|
||||
|
||||
bool AlsaSequencer::Open() {
|
||||
error = snd_seq_open(&handle, "default", SND_SEQ_OPEN_DUPLEX, 0);
|
||||
error = snd_seq_open(&handle, "default", SND_SEQ_OPEN_OUTPUT, SND_SEQ_NONBLOCK);
|
||||
if(error) {
|
||||
return false;
|
||||
}
|
||||
|
|
@ -95,7 +107,8 @@ bool filter(snd_seq_port_info_t *pinfo)
|
|||
if((capability & writable) != writable) {
|
||||
return false;
|
||||
}
|
||||
int type = snd_seq_port_info_get_type(pinfo);
|
||||
// TODO: filter based on type here? maybe?
|
||||
// int type = snd_seq_port_info_get_type(pinfo);
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -48,6 +48,7 @@ struct MidiOutDeviceInternal {
|
|||
int ClientID = -1;
|
||||
int PortNumber = -1;
|
||||
unsigned int type = 0;
|
||||
EMidiDeviceClass GetDeviceClass() const;
|
||||
};
|
||||
|
||||
// NOTE: the sequencer state is shared between actually playing MIDI music and device enumeration, therefore we keep it around.
|
||||
|
|
|
|||
Loading…
Reference in a new issue