jack2/common/JackAudioAdapter.cpp

/*
Copyright (C) 2008 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
(at your option) any later version.

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
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 "JackAudioAdapter.h"
#include "JackError.h"
#include "JackCompilerDeps.h"
#include "JackTools.h"
#include "JackTime.h"
#include "jslist.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

using namespace std;

namespace Jack
{

int JackAudioAdapter::Process(jack_nframes_t frames, void* arg)
{
    JackAudioAdapter* adapter = static_cast<JackAudioAdapter*>(arg);
    jack_default_audio_sample_t* inputBuffer[adapter->fAudioAdapter->GetInputs()];
    jack_default_audio_sample_t* outputBuffer[adapter->fAudioAdapter->GetOutputs()];

    // Always clear output
    for (int i = 0; i < adapter->fAudioAdapter->GetInputs(); i++) {
        inputBuffer[i] = (jack_default_audio_sample_t*)jack_port_get_buffer(adapter->fCapturePortList[i], frames);
        memset(inputBuffer[i], 0, frames * sizeof(jack_default_audio_sample_t));
    }

    for (int i = 0; i < adapter->fAudioAdapter->GetOutputs(); i++) {
        outputBuffer[i] = (jack_default_audio_sample_t*)jack_port_get_buffer(adapter->fPlaybackPortList[i], frames);
    }

    adapter->fAudioAdapter->PullAndPush(inputBuffer, outputBuffer, frames);
    return 0;
}

int JackAudioAdapter::BufferSize(jack_nframes_t buffer_size, void* arg)
{
    JackAudioAdapter* adapter = static_cast<JackAudioAdapter*>(arg);
    adapter->Reset();
    adapter->fAudioAdapter->SetHostBufferSize(buffer_size);
    return 0;
}

int JackAudioAdapter::SampleRate(jack_nframes_t sample_rate, void* arg)
{
    JackAudioAdapter* adapter = static_cast<JackAudioAdapter*>(arg);
    adapter->Reset();
    adapter->fAudioAdapter->SetHostSampleRate(sample_rate);
    return 0;
}

void JackAudioAdapter::Latency(jack_latency_callback_mode_t mode, void* arg)
{
    JackAudioAdapter* adapter = static_cast<JackAudioAdapter*>(arg);

    if (mode == JackCaptureLatency) {
        for (int i = 0; i < adapter->fAudioAdapter->GetInputs(); i++) {
            jack_latency_range_t range;
            range.min = range.max = adapter->fAudioAdapter->GetInputLatency(i);
            jack_port_set_latency_range(adapter->fCapturePortList[i], JackCaptureLatency, &range);
        }

    } else {
        for (int i = 0; i < adapter->fAudioAdapter->GetOutputs(); i++) {
            jack_latency_range_t range;
            range.min = range.max = adapter->fAudioAdapter->GetOutputLatency(i);
            jack_port_set_latency_range(adapter->fPlaybackPortList[i], JackPlaybackLatency, &range);
        }
    }
}

JackAudioAdapter::JackAudioAdapter(jack_client_t* client, JackAudioAdapterInterface* audio_io, const JSList* params)
    :fClient(client), fAudioAdapter(audio_io)
{
    const JSList* node;
    const jack_driver_param_t* param;
    fAutoConnect = false;

    for (node = params; node; node = jack_slist_next(node)) {
        param = (const jack_driver_param_t*)node->data;
        switch (param->character) {
            case 'c':
                fAutoConnect = true;
                break;
        }
    }
}

JackAudioAdapter::~JackAudioAdapter()
{
    // When called, Close has already been used for the client, thus ports are already unregistered.
    delete fAudioAdapter;
}

void JackAudioAdapter::FreePorts()
{
    for (int i = 0; i < fAudioAdapter->GetInputs(); i++) {
        if (fCapturePortList[i]) {
            jack_port_unregister(fClient, fCapturePortList[i]);
        }
    }
    for (int i = 0; i < fAudioAdapter->GetOutputs(); i++) {
        if (fPlaybackPortList[i]) {
            jack_port_unregister(fClient, fPlaybackPortList[i]);
        }
    }

    delete[] fCapturePortList;
    delete[] fPlaybackPortList;
}

void JackAudioAdapter::ConnectPorts()
{
    const char** ports;

    ports = jack_get_ports(fClient, NULL, NULL, JackPortIsPhysical | JackPortIsInput);
    if (ports != NULL) {
        for (int i = 0; i < fAudioAdapter->GetInputs() && ports[i]; i++) {
            jack_connect(fClient, jack_port_name(fCapturePortList[i]), ports[i]);
        }
        jack_free(ports);
    }

    ports = jack_get_ports(fClient, NULL, NULL, JackPortIsPhysical | JackPortIsOutput);
    if (ports != NULL) {
        for (int i = 0; i < fAudioAdapter->GetOutputs() && ports[i]; i++) {
            jack_connect(fClient, ports[i], jack_port_name(fPlaybackPortList[i]));
        }
        jack_free(ports);
    }
}

void JackAudioAdapter::Reset()
{
    fAudioAdapter->Reset();
}

int JackAudioAdapter::Open()
{
    char name[32];
    jack_log("JackAudioAdapter::Open fCaptureChannels %d fPlaybackChannels %d", fAudioAdapter->GetInputs(), fAudioAdapter->GetOutputs());
    fAudioAdapter->Create();

    //jack ports
    fCapturePortList = new jack_port_t*[fAudioAdapter->GetInputs()];
    fPlaybackPortList = new jack_port_t*[fAudioAdapter->GetOutputs()];

    for (int i = 0; i < fAudioAdapter->GetInputs(); i++) {
        snprintf(name, sizeof(name), "capture_%d", i + 1);
        if ((fCapturePortList[i] = jack_port_register(fClient, name, JACK_DEFAULT_AUDIO_TYPE, CaptureDriverFlags, 0)) == NULL) {
            goto fail;
        }
    }

    for (int i = 0; i < fAudioAdapter->GetOutputs(); i++) {
        snprintf(name, sizeof(name), "playback_%d", i + 1);
        if ((fPlaybackPortList[i] = jack_port_register(fClient, name, JACK_DEFAULT_AUDIO_TYPE, PlaybackDriverFlags, 0)) == NULL) {
            goto fail;
        }
    }

    //callbacks and activation
    if (jack_set_process_callback(fClient, Process, this) < 0) {
        goto fail;
    }
    if (jack_set_buffer_size_callback(fClient, BufferSize, this) < 0) {
        goto fail;
    }
    if (jack_set_sample_rate_callback(fClient, SampleRate, this) < 0) {
        goto fail;
    }
    if (jack_set_latency_callback(fClient, Latency, this) < 0) {
        goto fail;
    }
    if (jack_activate(fClient) < 0) {
        goto fail;
    }

    if (fAutoConnect) {
        ConnectPorts();
    }

    // Ring buffers are now allocated...
    return fAudioAdapter->Open();
    return 0;

fail:
    FreePorts();
    fAudioAdapter->Destroy();
    return -1;
}

int JackAudioAdapter::Close()
{
    fAudioAdapter->Close();
    fAudioAdapter->Destroy();
    return 0;
}

} //namespace