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Java example source code file (PLATFORM_API_BsdOS_ALSA_MidiOut.c)

This example Java source code file (PLATFORM_API_BsdOS_ALSA_MidiOut.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

channel_message_length, error, error0, int32, midi_invalid_handle, midi_out_closedevice, midi_out_getnumdevices, midi_out_opendevice, midi_out_sendlongmessage, midi_out_sendshortmessage, null\\n, trace0, uint32, use_platform_midi_out

The PLATFORM_API_BsdOS_ALSA_MidiOut.c Java example source code

/*
 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#define USE_ERROR
#define USE_TRACE

#if USE_PLATFORM_MIDI_OUT == TRUE

#include <alsa/asoundlib.h>
#include "PlatformMidi.h"
#include "PLATFORM_API_BsdOS_ALSA_MidiUtils.h"



static int CHANNEL_MESSAGE_LENGTH[] = {
    -1, -1, -1, -1, -1, -1, -1, -1, 3, 3, 3, 3, 2, 2, 3 };
/*                                 8x 9x Ax Bx Cx Dx Ex */

static int SYSTEM_MESSAGE_LENGTH[] = {
    -1, 2, 3, 2, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1 };
/*  F0 F1 F2 F3  F4  F5 F6 F7 F8  F9 FA FB FC  FD FE FF */


// the returned length includes the status byte.
// for illegal messages, -1 is returned.
static int getShortMessageLength(int status) {
        int     dataLength = 0;
        if (status < 0xF0) { // channel voice message
                dataLength = CHANNEL_MESSAGE_LENGTH[(status >> 4) & 0xF];
        } else {
                dataLength = SYSTEM_MESSAGE_LENGTH[status & 0xF];
        }
        return dataLength;
}


/*
 * implementation of the platform-dependent
 * MIDI out functions declared in PlatformMidi.h
 */
char* MIDI_OUT_GetErrorStr(INT32 err) {
    return (char*) getErrorStr(err);
}


INT32 MIDI_OUT_GetNumDevices() {
    TRACE0("MIDI_OUT_GetNumDevices()\n");
    return getMidiDeviceCount(SND_RAWMIDI_STREAM_OUTPUT);
}


INT32 MIDI_OUT_GetDeviceName(INT32 deviceIndex, char *name, UINT32 nameLength) {
    TRACE0("MIDI_OUT_GetDeviceName()\n");
    return getMidiDeviceName(SND_RAWMIDI_STREAM_OUTPUT, deviceIndex,
                             name, nameLength);
}


INT32 MIDI_OUT_GetDeviceVendor(INT32 deviceIndex, char *name, UINT32 nameLength) {
    TRACE0("MIDI_OUT_GetDeviceVendor()\n");
    return getMidiDeviceVendor(deviceIndex, name, nameLength);
}


INT32 MIDI_OUT_GetDeviceDescription(INT32 deviceIndex, char *name, UINT32 nameLength) {
    TRACE0("MIDI_OUT_GetDeviceDescription()\n");
    return getMidiDeviceDescription(SND_RAWMIDI_STREAM_OUTPUT, deviceIndex,
                                    name, nameLength);
}


INT32 MIDI_OUT_GetDeviceVersion(INT32 deviceIndex, char *name, UINT32 nameLength) {
    TRACE0("MIDI_OUT_GetDeviceVersion()\n");
    return getMidiDeviceVersion(deviceIndex, name, nameLength);
}


/* *************************** MidiOutDevice implementation *************** */

INT32 MIDI_OUT_OpenDevice(INT32 deviceIndex, MidiDeviceHandle** handle) {
    TRACE1("MIDI_OUT_OpenDevice(): deviceIndex: %d\n", (int) deviceIndex);
    return openMidiDevice(SND_RAWMIDI_STREAM_OUTPUT, deviceIndex, handle);
}


INT32 MIDI_OUT_CloseDevice(MidiDeviceHandle* handle) {
    TRACE0("MIDI_OUT_CloseDevice()\n");
    return closeMidiDevice(handle);
}


INT64 MIDI_OUT_GetTimeStamp(MidiDeviceHandle* handle) {
    return getMidiTimestamp(handle);
}


INT32 MIDI_OUT_SendShortMessage(MidiDeviceHandle* handle, UINT32 packedMsg,
                                UINT32 timestamp) {
    int err;
    int status;
    int data1;
    int data2;
    char buffer[3];

    TRACE2("> MIDI_OUT_SendShortMessage() %x, time: %u\n", packedMsg, (unsigned int) timestamp);
    if (!handle) {
        ERROR0("< ERROR: MIDI_OUT_SendShortMessage(): handle is NULL\n");
        return MIDI_INVALID_HANDLE;
    }
    if (!handle->deviceHandle) {
        ERROR0("< ERROR: MIDI_OUT_SendLongMessage(): native handle is NULL\n");
        return MIDI_INVALID_HANDLE;
    }
    status = (packedMsg & 0xFF);
    buffer[0] = (char) status;
    buffer[1]  = (char) ((packedMsg >> 8) & 0xFF);
    buffer[2]  = (char) ((packedMsg >> 16) & 0xFF);
    TRACE4("status: %d, data1: %d, data2: %d, length: %d\n", (int) buffer[0], (int) buffer[1], (int) buffer[2], getShortMessageLength(status));
    err = snd_rawmidi_write((snd_rawmidi_t*) handle->deviceHandle, buffer, getShortMessageLength(status));
    if (err < 0) {
        ERROR1("  ERROR: MIDI_OUT_SendShortMessage(): snd_rawmidi_write() returned %d\n", err);
    }

    TRACE0("< MIDI_OUT_SendShortMessage()\n");
    return err;
}


INT32 MIDI_OUT_SendLongMessage(MidiDeviceHandle* handle, UBYTE* data,
                               UINT32 size, UINT32 timestamp) {
    int err;

    TRACE2("> MIDI_OUT_SendLongMessage() size %u, time: %u\n", (unsigned int) size, (unsigned int) timestamp);
    if (!handle) {
        ERROR0("< ERROR: MIDI_OUT_SendLongMessage(): handle is NULL\n");
        return MIDI_INVALID_HANDLE;
    }
    if (!handle->deviceHandle) {
        ERROR0("< ERROR: MIDI_OUT_SendLongMessage(): native handle is NULL\n");
        return MIDI_INVALID_HANDLE;
    }
    if (!data) {
        ERROR0("< ERROR: MIDI_OUT_SendLongMessage(): data is NULL\n");
        return MIDI_INVALID_HANDLE;
    }
    err = snd_rawmidi_write((snd_rawmidi_t*) handle->deviceHandle,
                            data, size);
    if (err < 0) {
        ERROR1("  ERROR: MIDI_OUT_SendLongMessage(): snd_rawmidi_write() returned %d\n", err);
    }

    TRACE0("< MIDI_OUT_SendLongMessage()\n");
    return err;
}


#endif /* USE_PLATFORM_MIDI_OUT */

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