JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2003, 2007, 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_LinuxOS_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;
    }

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