/*

 * Copyright (c) 2003, 2010, 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_IN == TRUE

#include <alsa/asoundlib.h>

#include "PlatformMidi.h"

#include "PLATFORM_API_LinuxOS_ALSA_MidiUtils.h"

#if defined(i586)

#include <sys/utsname.h>

#endif

/*

 * Helper methods

 */

static inline UINT32 packMessage(int status, int data1, int data2) {

    return ((status & 0xFF) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16));

}

static void setShortMessage(MidiMessage* message,

                            int status, int data1, int data2) {

    message->type = SHORT_MESSAGE;

    message->data.s.packedMsg = packMessage(status, data1, data2);

}

static void setRealtimeMessage(MidiMessage* message, int status) {

    setShortMessage(message, status, 0, 0);

}

static void set14bitMessage(MidiMessage* message, int status, int value) {

    TRACE3("14bit value: %d, lsb: %d, msb: %d\n", value, value & 0x7F, (value >> 7) & 0x7F);

    value &= 0x3FFF;

    TRACE3("14bit value (2): %d, lsb: %d, msb: %d\n", value, value & 0x7F, (value >> 7) & 0x7F);

    setShortMessage(message, status,

                    value & 0x7F,

                    (value >> 7) & 0x7F);

}

/*

 * implementation of the platform-dependent

 * MIDI in functions declared in PlatformMidi.h

 */

char* MIDI_IN_GetErrorStr(INT32 err) {

    return (char*) getErrorStr(err);

}

INT32 MIDI_IN_GetNumDevices() {

/* Workaround for 6842956: 32bit app on 64bit linux

 * gets assertion failure trying to open midiIn ports.

 * Untill the issue is fixed in ALSA

 * (https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4807)

 * report no midi in devices in the configuration.

 */

#if defined(i586)

    static int jre32onlinux64 = -1;

    if (jre32onlinux64 < 0) {

        jre32onlinux64 = 0;

        /* The workaround may be disabled setting "JAVASOUND_ENABLE_MIDIIN"

         * environment variable.

         */

        if (getenv("JAVASOUND_ENABLE_MIDIIN") == NULL) {

            struct utsname u;

            jre32onlinux64 = 0;

            if (uname(&u) == 0) {

                if (strstr(u.machine, "64") != NULL) {

                    TRACE0("jre32 on linux64 detected - report no midiIn devices\n");

                    jre32onlinux64 = 1;

                }

            }

        }

    }

    if (jre32onlinux64) {

        return 0;

    }

#endif

    TRACE0("MIDI_IN_GetNumDevices()\n");

    return getMidiDeviceCount(SND_RAWMIDI_STREAM_INPUT);

}

INT32 MIDI_IN_GetDeviceName(INT32 deviceIndex, char *name, UINT32 nameLength) {

    int ret = getMidiDeviceName(SND_RAWMIDI_STREAM_INPUT, deviceIndex,

                                name, nameLength);

    return ret;

}

INT32 MIDI_IN_GetDeviceVendor(INT32 deviceIndex, char *name, UINT32 nameLength) {

    int ret = getMidiDeviceVendor(deviceIndex, name, nameLength);

    return ret;

}

INT32 MIDI_IN_GetDeviceDescription(INT32 deviceIndex, char *name, UINT32 nameLength) {

    int ret = getMidiDeviceDescription(SND_RAWMIDI_STREAM_INPUT, deviceIndex,

                                       name, nameLength);

    return ret;

}

INT32 MIDI_IN_GetDeviceVersion(INT32 deviceIndex, char *name, UINT32 nameLength) {

    int ret = getMidiDeviceVersion(deviceIndex, name, nameLength);

    return ret;

}

/*************************************************************************/

INT32 MIDI_IN_OpenDevice(INT32 deviceIndex, MidiDeviceHandle** handle) {

    INT32 ret;

    TRACE0("> MIDI_IN_OpenDevice\n");

    ret = openMidiDevice(SND_RAWMIDI_STREAM_INPUT, deviceIndex, handle);

    TRACE1("< MIDI_IN_OpenDevice: returning %d\n", (int) ret);

    return ret;

}

INT32 MIDI_IN_CloseDevice(MidiDeviceHandle* handle) {

    INT32 ret;

    TRACE0("> MIDI_IN_CloseDevice\n");

    ret = closeMidiDevice(handle);

    TRACE1("< MIDI_IN_CloseDevice: returning %d\n", (int) ret);

    return ret;

}

INT32 MIDI_IN_StartDevice(MidiDeviceHandle* handle) {

    TRACE0("MIDI_IN_StartDevice\n");

    return MIDI_SUCCESS;

}

INT32 MIDI_IN_StopDevice(MidiDeviceHandle* handle) {

    TRACE0("MIDI_IN_StopDevice\n");

    return MIDI_SUCCESS;

}

INT64 MIDI_IN_GetTimeStamp(MidiDeviceHandle* handle) {

    return getMidiTimestamp(handle);

}

/* read the next message from the queue */

MidiMessage* MIDI_IN_GetMessage(MidiDeviceHandle* handle) {

    snd_seq_event_t alsa_message;

    MidiMessage* jdk_message;

    int err;

    char buffer[1];

    int status;

    TRACE0("> MIDI_IN_GetMessage\n");

    if (!handle) {

        ERROR0("< ERROR: MIDI_IN_GetMessage(): handle is NULL\n");

        return NULL;

    }

    if (!handle->deviceHandle) {

        ERROR0("< ERROR: MIDI_IN_GetMessage(): native handle is NULL\n");

        return NULL;

    }

    if (!handle->platformData) {

        ERROR0("< ERROR: MIDI_IN_GetMessage(): platformData is NULL\n");

        return NULL;

    }

    /* For MIDI In, the device is left in non blocking mode. So if there is

       no data from the device, snd_rawmidi_read() returns with -11 (EAGAIN).

       This results in jumping back to the Java layer. */

    while (TRUE) {

        TRACE0("before snd_rawmidi_read()\n");

        err = snd_rawmidi_read((snd_rawmidi_t*) handle->deviceHandle, buffer, 1);

        TRACE0("after snd_rawmidi_read()\n");

        if (err != 1) {

            ERROR2("< ERROR: MIDI_IN_GetMessage(): snd_rawmidi_read() returned %d : %s\n", err, snd_strerror(err));

            return NULL;

        }

        // printf("received byte: %d\n", buffer[0]);

        err = snd_midi_event_encode_byte((snd_midi_event_t*) handle->platformData,

                                         (int) buffer[0],

                                         &alsa_message);

        if (err == 1) {

            break;

        } else if (err < 0) {

            ERROR1("< ERROR: MIDI_IN_GetMessage(): snd_midi_event_encode_byte() returned %d\n", err);

            return NULL;

        }

    }

    jdk_message = (MidiMessage*) calloc(sizeof(MidiMessage), 1);

    if (!jdk_message) {

        ERROR0("< ERROR: MIDI_IN_GetMessage(): out of memory\n");

        return NULL;

    }

    // TODO: tra

    switch (alsa_message.type) {

    case SND_SEQ_EVENT_NOTEON:

    case SND_SEQ_EVENT_NOTEOFF:

    case SND_SEQ_EVENT_KEYPRESS:

        status = (alsa_message.type == SND_SEQ_EVENT_KEYPRESS) ? 0xA0 :

            (alsa_message.type == SND_SEQ_EVENT_NOTEON) ? 0x90 : 0x80;

        status |= alsa_message.data.note.channel;

        setShortMessage(jdk_message, status,

                        alsa_message.data.note.note,

                        alsa_message.data.note.velocity);

        break;

    case SND_SEQ_EVENT_CONTROLLER:

        status = 0xB0 | alsa_message.data.control.channel;

        setShortMessage(jdk_message, status,

                        alsa_message.data.control.param,

                        alsa_message.data.control.value);

        break;

    case SND_SEQ_EVENT_PGMCHANGE:

    case SND_SEQ_EVENT_CHANPRESS:

        status = (alsa_message.type == SND_SEQ_EVENT_PGMCHANGE) ? 0xC0 : 0xD0;

        status |= alsa_message.data.control.channel;

        setShortMessage(jdk_message, status,

                        alsa_message.data.control.value, 0);

        break;

    case SND_SEQ_EVENT_PITCHBEND:

        status = 0xE0 | alsa_message.data.control.channel;

        // $$mp 2003-09-23:

        // possible hack to work around a bug in ALSA. Necessary for

        // ALSA 0.9.2. May be fixed in newer versions of ALSA.

        // alsa_message.data.control.value ^= 0x2000;

        // TRACE1("pitchbend value: %d\n", alsa_message.data.control.value);

        set14bitMessage(jdk_message, status,

                        alsa_message.data.control.value);

        break;

        /* System exclusive messages */

    case SND_SEQ_EVENT_SYSEX:

        jdk_message->type = LONG_MESSAGE;

        jdk_message->data.l.size = alsa_message.data.ext.len;

        jdk_message->data.l.data = malloc(alsa_message.data.ext.len);

        if (jdk_message->data.l.data == NULL) {

            ERROR0("< ERROR: MIDI_IN_GetMessage(): out of memory\n");

            free(jdk_message);

            jdk_message = NULL;

        } else {

            memcpy(jdk_message->data.l.data, alsa_message.data.ext.ptr, alsa_message.data.ext.len);

        }

        break;

        /* System common messages */

    case SND_SEQ_EVENT_QFRAME:

        setShortMessage(jdk_message, 0xF1,

                        alsa_message.data.control.value & 0x7F, 0);

        break;

    case SND_SEQ_EVENT_SONGPOS:

        set14bitMessage(jdk_message, 0xF2,

                        alsa_message.data.control.value);

        break;

    case SND_SEQ_EVENT_SONGSEL:

        setShortMessage(jdk_message, 0xF3,

                        alsa_message.data.control.value & 0x7F, 0);

        break;

    case SND_SEQ_EVENT_TUNE_REQUEST:

        setRealtimeMessage(jdk_message, 0xF6);

        break;

        /* System realtime messages */

    case SND_SEQ_EVENT_CLOCK:

        setRealtimeMessage(jdk_message, 0xF8);

        break;

    case SND_SEQ_EVENT_START:

        setRealtimeMessage(jdk_message, 0xFA);

        break;

    case SND_SEQ_EVENT_CONTINUE:

        setRealtimeMessage(jdk_message, 0xFB);

        break;

    case SND_SEQ_EVENT_STOP:

        setRealtimeMessage(jdk_message, 0xFC);

        break;

    case SND_SEQ_EVENT_SENSING:

        setRealtimeMessage(jdk_message, 0xFE);

        break;

    case SND_SEQ_EVENT_RESET:

        setRealtimeMessage(jdk_message, 0xFF);

        break;

    default:

        ERROR0("< ERROR: MIDI_IN_GetMessage(): unhandled ALSA MIDI message type\n");

        free(jdk_message);

        jdk_message = NULL;

    }

    // set timestamp

    if (jdk_message != NULL) {

        jdk_message->timestamp = getMidiTimestamp(handle);

    }

    TRACE1("< MIDI_IN_GetMessage: returning %p\n", jdk_message);

    return jdk_message;

}

void MIDI_IN_ReleaseMessage(MidiDeviceHandle* handle, MidiMessage* msg) {

    if (!msg) {

        ERROR0("< ERROR: MIDI_IN_ReleaseMessage(): message is NULL\n");

        return;

    }

    if (msg->type == LONG_MESSAGE && msg->data.l.data) {

        free(msg->data.l.data);

    }

    free(msg);

}

#endif /* USE_PLATFORM_MIDI_IN */