jack2/common/JackMidiDriver.cpp

/*
Copyright (C) 2009 Grame.

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
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
(at your option) any later version.

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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include "JackSystemDeps.h"
#include "JackMidiDriver.h"
#include "JackTime.h"
#include "JackError.h"
#include "JackEngineControl.h"
#include "JackPort.h"
#include "JackGraphManager.h"
#include "JackException.h"
#include <assert.h>

namespace Jack
{

JackMidiDriver::JackMidiDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
        : JackDriver(name, alias, engine, table),
        fCaptureChannels(0),
        fPlaybackChannels(0)
{}

JackMidiDriver::~JackMidiDriver()
{}

int JackMidiDriver::Open(bool capturing,
                        bool playing,
                        int inchannels,
                        int outchannels,
                        bool monitor,
                        const char* capture_driver_name,
                        const char* playback_driver_name,
                        jack_nframes_t capture_latency,
                        jack_nframes_t playback_latency)
{
    fCaptureChannels = inchannels;
    fPlaybackChannels = outchannels;
    return JackDriver::Open(capturing, playing, inchannels, outchannels, monitor, capture_driver_name, playback_driver_name, capture_latency, playback_latency);
}

int JackMidiDriver::Attach()
{
    JackPort* port;
    jack_port_id_t port_index;
    char name[JACK_CLIENT_NAME_SIZE + JACK_PORT_NAME_SIZE];
    char alias[JACK_CLIENT_NAME_SIZE + JACK_PORT_NAME_SIZE];
    int i;

    jack_log("JackMidiDriver::Attach fBufferSize = %ld fSampleRate = %ld", fEngineControl->fBufferSize, fEngineControl->fSampleRate);

    for (i = 0; i < fCaptureChannels; i++) {
        snprintf(alias, sizeof(alias) - 1, "%s:%s:out%d", fAliasName, fCaptureDriverName, i + 1);
        snprintf(name, sizeof(name) - 1, "%s:capture_%d", fClientControl.fName, i + 1);
        if (fEngine->PortRegister(fClientControl.fRefNum, name, JACK_DEFAULT_MIDI_TYPE, CaptureDriverFlags, fEngineControl->fBufferSize, &port_index) < 0) {
            jack_error("driver: cannot register port for %s", name);
            return -1;
        }
        port = fGraphManager->GetPort(port_index);
        port->SetAlias(alias);
        fCapturePortList[i] = port_index;
        jack_log("JackMidiDriver::Attach fCapturePortList[i] port_index = %ld", port_index);
    }

    for (i = 0; i < fPlaybackChannels; i++) {
        snprintf(alias, sizeof(alias) - 1, "%s:%s:in%d", fAliasName, fPlaybackDriverName, i + 1);
        snprintf(name, sizeof(name) - 1, "%s:playback_%d", fClientControl.fName, i + 1);
        if (fEngine->PortRegister(fClientControl.fRefNum, name, JACK_DEFAULT_MIDI_TYPE, PlaybackDriverFlags, fEngineControl->fBufferSize, &port_index) < 0) {
            jack_error("driver: cannot register port for %s", name);
            return -1;
        }
        port = fGraphManager->GetPort(port_index);
        port->SetAlias(alias);
        fPlaybackPortList[i] = port_index;
        jack_log("JackMidiDriver::Attach fPlaybackPortList[i] port_index = %ld", port_index);
    }

    UpdateLatencies();
    return 0;
}

int JackMidiDriver::Detach()
{
    int i;
    jack_log("JackMidiDriver::Detach");

    for (i = 0; i < fCaptureChannels; i++) {
        fEngine->PortUnRegister(fClientControl.fRefNum, fCapturePortList[i]);
    }

    for (i = 0; i < fPlaybackChannels; i++) {
        fEngine->PortUnRegister(fClientControl.fRefNum, fPlaybackPortList[i]);
    }

    return 0;
}

void JackMidiDriver::UpdateLatencies()
{
    jack_latency_range_t range;

    for (int i = 0; i < fCaptureChannels; i++) {
        range.max = range.min = fEngineControl->fBufferSize;
        fGraphManager->GetPort(fCapturePortList[i])->SetLatencyRange(JackCaptureLatency, &range);
    }

    for (int i = 0; i < fPlaybackChannels; i++) {
        if (! fEngineControl->fSyncMode) {
            range.max = range.min = fEngineControl->fBufferSize * 2;
        }
        fGraphManager->GetPort(fPlaybackPortList[i])->SetLatencyRange(JackPlaybackLatency, &range);
    }
}

int JackMidiDriver::SetBufferSize(jack_nframes_t buffer_size)
{
    UpdateLatencies();
    return 0;
}

int JackMidiDriver::ProcessRead()
{
    return (fEngineControl->fSyncMode) ? ProcessReadSync() : ProcessReadAsync();
}

int JackMidiDriver::ProcessWrite()
{
    return (fEngineControl->fSyncMode) ? ProcessWriteSync() : ProcessWriteAsync();
}

int JackMidiDriver::ProcessReadSync()
{
    int res = 0;

    // Read input buffers for the current cycle
    if (Read() < 0) {
        jack_error("JackMidiDriver::ProcessReadSync: read error, skip cycle");
        res = -1;
    }

    if (fGraphManager->ResumeRefNum(&fClientControl, fSynchroTable) < 0) {
        jack_error("JackMidiDriver::ProcessReadSync - ResumeRefNum error");
        res = -1;
    }

    return res;
}

int JackMidiDriver::ProcessWriteSync()
{
    int res = 0;

    if (fGraphManager->SuspendRefNum(&fClientControl, fSynchroTable,
                                     DRIVER_TIMEOUT_FACTOR *
                                     fEngineControl->fTimeOutUsecs) < 0) {
        jack_error("JackMidiDriver::ProcessWriteSync - SuspendRefNum error");
        res = -1;
    }

    // Write output buffers from the current cycle
    if (Write() < 0) {
        jack_error("JackMidiDriver::ProcessWriteSync - Write error");
        res = -1;
    }

    return res;
}

int JackMidiDriver::ProcessReadAsync()
{
    int res = 0;

    // Read input buffers for the current cycle
    if (Read() < 0) {
        jack_error("JackMidiDriver::ProcessReadAsync: read error, skip cycle");
        res = -1;
    }

    // Write output buffers from the previous cycle
    if (Write() < 0) {
        jack_error("JackMidiDriver::ProcessReadAsync - Write error");
        res = -1;
    }

    if (fGraphManager->ResumeRefNum(&fClientControl, fSynchroTable) < 0) {
        jack_error("JackMidiDriver::ProcessReadAsync - ResumeRefNum error");
        res = -1;
    }

    return res;
}

int JackMidiDriver::ProcessWriteAsync()
{
    return 0;
}

JackMidiBuffer* JackMidiDriver::GetInputBuffer(int port_index)
{
    assert(fCapturePortList[port_index]);
    return (JackMidiBuffer*)fGraphManager->GetBuffer(fCapturePortList[port_index], fEngineControl->fBufferSize);
}

JackMidiBuffer* JackMidiDriver::GetOutputBuffer(int port_index)
{
    assert(fPlaybackPortList[port_index]);
    return (JackMidiBuffer*)fGraphManager->GetBuffer(fPlaybackPortList[port_index], fEngineControl->fBufferSize);
}

} // end of namespace