Midi_w32.cc

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/*
 * Win32 MIDI utility routines for openMSX.
 *
 * Copyright (c) 2003 Reikan.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifdef _WIN32
 
#include "Midi_w32.hh"
#include "MSXException.hh"
#include "MemBuffer.hh"
#include "cstdiop.hh"
#include "one_of.hh"
#include "xrange.hh"
 
#include <cstring>
#include <cstdlib>
#include <sstream>
#include <cassert>
 
#define MAXPATHLEN MAX_PATH
 
using std::string;
 
namespace openmsx {
 
/*
 * MIDI I/O helper functions for Win32.
 */
// MIDI SYSTEM MESSAGES max length is not defined...
// TODO: support variable length.
#define OPENMSX_W32_MIDI_SYSMES_MAXLEN 4096
 
 
struct vfn_midi {
        unsigned idx;
        unsigned devid;
        HMIDI    handle;
        char     vfname[MAXPATHLEN + 1];
        char     devname[MAXPNAMELEN];
};
 
struct outbuf {
        MIDIHDR  header;
};
 
static MemBuffer<vfn_midi> vfnt_midiout;
static MemBuffer<vfn_midi> vfnt_midiin;
static unsigned vfnt_midiout_num, vfnt_midiin_num;
 
static MemBuffer<int> state_out;
static MemBuffer<outbuf> buf_out;
 
static MIDIHDR inhdr;
static char inlongmes[OPENMSX_W32_MIDI_SYSMES_MAXLEN];
 
 
static void w32_midiDevNameConv(char *dst, char *src)
{
        size_t len = strlen(src);
        size_t i = 0;
        for (; i < len; ++i) {
                if ((src[i] < '0') || (src[i] > 'z') ||
                    ((src[i] > '9') && (src[i] < 'A')) ||
                    ((src[i] > 'Z') && (src[i] < 'a'))) {
                        dst[i] = '_';
                } else {
                        dst[i] = src[i];
                }
        }
        dst[i] = '\0';
}
 
 
// MIDI-OUT
static int w32_midiOutFindDev(unsigned *idx, unsigned *dev, const char *vfn)
{
        for (auto i : xrange(vfnt_midiout_num)) {
                if (!strcmp(vfnt_midiout[i].vfname, vfn)) {
                        *idx = i;
                        *dev = vfnt_midiout[i].devid;
                        return 0;
                }
        }
        return -1;
}
 
 
int w32_midiOutInit()
{
        vfnt_midiout_num = 0;
        unsigned num = midiOutGetNumDevs();
        if (!num) return 0;
 
        state_out.resize(num + 1);
        memset(state_out.data(), 0, (num + 1) * sizeof(int));
 
        buf_out.resize(num + 1);
        memset(buf_out.data(), 0, (num + 1) * sizeof(outbuf));
 
        vfnt_midiout.resize(num + 1);
 
        // MIDI_MAPPER is #define's as ((UINT)-1)
        UINT OPENMSX_MIDI_MAPPER = static_cast<UINT>(-1);
        MIDIOUTCAPSA cap;
        if (midiOutGetDevCapsA(OPENMSX_MIDI_MAPPER, &cap, sizeof(cap)) != MMSYSERR_NOERROR) {
                return 2;
        }
        vfnt_midiout[0].devid = OPENMSX_MIDI_MAPPER;
        w32_midiDevNameConv(vfnt_midiout[0].devname, cap.szPname);
        strncpy(vfnt_midiout[0].vfname, "midi-out", MAXPATHLEN + 1);
        vfnt_midiout_num ++;
 
        for (auto i : xrange(num)) {
                if (midiOutGetDevCapsA(i, &cap, sizeof(cap)) != MMSYSERR_NOERROR) {
                        return 0; // atleast MIDI-MAPPER is available...
                }
                vfnt_midiout[i + 1].devid = i;
                w32_midiDevNameConv(vfnt_midiout[i + 1].devname, cap.szPname);
                snprintf(vfnt_midiout[i + 1].vfname, MAXPATHLEN + 1, "midi-out-%u", i);
                vfnt_midiout_num++;
        }
        return 0;
}
 
void w32_midiOutClean()
{
        vfnt_midiout_num = 0;
}
 
 
unsigned w32_midiOutGetVFNsNum()
{
        return vfnt_midiout_num;
}
 
string w32_midiOutGetVFN(unsigned nmb)
{
        assert(nmb < vfnt_midiout_num);
        return vfnt_midiout[nmb].vfname;
}
 
string w32_midiOutGetRDN(unsigned nmb)
{
        assert(nmb < vfnt_midiout_num);
        return vfnt_midiout[nmb].devname;
}
 
 
unsigned w32_midiOutOpen(const char *vfn)
{
        unsigned idx, devid;
        if (w32_midiOutFindDev(&idx, &devid,vfn)) {
                return unsigned(-1);
        }
        if (midiOutOpen(reinterpret_cast<HMIDIOUT*>(&vfnt_midiout[idx].handle), devid, 0, 0 ,0) != MMSYSERR_NOERROR) {
                return unsigned(-1);
        }
        return idx;
}
 
int w32_midiOutClose(unsigned idx)
{
        midiOutReset(reinterpret_cast<HMIDIOUT>(vfnt_midiout[idx].handle));
        if (midiOutClose(reinterpret_cast<HMIDIOUT>(vfnt_midiout[idx].handle)) == MMSYSERR_NOERROR) {
                return 0;
        } else {
                return -1;
        }
}
 
 
static int w32_midiOutFlushExclusiveMsg(unsigned idx)
{
        int i;
        //buf_out[idx].header.lpData = buf_out[idx].longmes;
        //buf_out[idx].header.dwBufferLength = buf_out[idx].longmes_cnt;
        buf_out[idx].header.dwFlags = 0;
        if ((i = midiOutPrepareHeader(reinterpret_cast<HMIDIOUT>(vfnt_midiout[idx].handle), &buf_out[idx].header, sizeof(buf_out[idx].header))) != MMSYSERR_NOERROR) {
                throw FatalError("midiOutPrepareHeader() returned ", i);
        }
        if ((i = midiOutLongMsg(reinterpret_cast<HMIDIOUT>(vfnt_midiout[idx].handle), &buf_out[idx].header, sizeof(buf_out[idx].header))) != MMSYSERR_NOERROR) {
                throw FatalError("midiOutLongMsg() returned ", i);
        }
        // Wait sending in driver.
        // This may take long...
        while (!(buf_out[idx].header.dwFlags & MHDR_DONE)) {
                Sleep(1);
        }
        // Sending Exclusive done.
        if ((i = midiOutUnprepareHeader(reinterpret_cast<HMIDIOUT>(vfnt_midiout[idx].handle), &buf_out[idx].header, sizeof(buf_out[idx].header))) != MMSYSERR_NOERROR) {
                throw FatalError("midiOutUnPrepareHeader() returned ", i);
        }
        return 0;
}
 
int w32_midiOutMsg(size_t size, const uint8_t* data, unsigned idx)
{
        if (size == 0) return 0;
 
        HMIDIOUT hMidiOut = reinterpret_cast<HMIDIOUT>(vfnt_midiout[idx].handle);
        if (data[0] == one_of(0xF0, 0xF7)) { // SysEx
                if (size > OPENMSX_W32_MIDI_SYSMES_MAXLEN) {
                        return -1;
                }
                auto& buf = buf_out[idx];
                // Note: We have to be careful with the const_cast here.
                // Even though Windows doesn't write to the buffer, it fails if you don't have
                // write access to the respective memory page.
                buf.header.lpData = const_cast<LPSTR>(reinterpret_cast<LPCSTR>(data));
                buf.header.dwBufferLength = unsigned(size);
                w32_midiOutFlushExclusiveMsg(idx);
        } else {
                DWORD midiMsg = 0x000000;
                for (unsigned i = 0; i < size && i < 4; i++) {
                        midiMsg |= data[i] << (8 * i);
                }
                midiOutShortMsg(hMidiOut, midiMsg);
        }
        return 0;
}
 
 
// MIDI-IN
static int w32_midiInFindDev(unsigned *idx, unsigned *dev, const char *vfn)
{
        for (auto i : xrange(vfnt_midiin_num)) {
                if (!strcmp(vfnt_midiin[i].vfname, vfn)) {
                        *idx = i;
                        *dev = vfnt_midiin[i].devid;
                        return 0;
                }
        }
        return -1;
}
 
 
int w32_midiInInit()
{
        vfnt_midiin_num = 0;
        unsigned num = midiInGetNumDevs();
        if (!num) return 0;
 
        vfnt_midiin.resize(num + 1);
        for (auto i : xrange(num)) {
                MIDIINCAPSA cap;
                if (midiInGetDevCapsA(i, &cap, sizeof(cap)) != MMSYSERR_NOERROR) {
                        return 1;
                }
                vfnt_midiin[i].devid = i;
                w32_midiDevNameConv(vfnt_midiin[i].devname, cap.szPname);
                snprintf(vfnt_midiin[i].vfname, MAXPATHLEN + 1, "midi-in-%u", i);
                vfnt_midiin_num++;
        }
        return 0;
}
 
void w32_midiInClean()
{
        vfnt_midiin_num = 0;
}
 
 
unsigned w32_midiInGetVFNsNum()
{
        return vfnt_midiin_num;
}
 
string w32_midiInGetVFN(unsigned nmb)
{
        assert(nmb < vfnt_midiin_num);
        return vfnt_midiin[nmb].vfname;
}
 
string w32_midiInGetRDN(unsigned nmb)
{
        assert(nmb < vfnt_midiin_num);
        return vfnt_midiin[nmb].devname;
}
 
unsigned w32_midiInOpen(const char *vfn, DWORD thrdid)
{
        unsigned idx, devid;
        if (w32_midiInFindDev(&idx, &devid, vfn)) {
                return unsigned(-1);
        }
        if (midiInOpen(reinterpret_cast<HMIDIIN*>(&vfnt_midiin[idx].handle), devid, thrdid, 0, CALLBACK_THREAD) != MMSYSERR_NOERROR) {
                return unsigned(-1);
        }
        memset(&inhdr, 0, sizeof(inhdr));
        inhdr.lpData = inlongmes;
        inhdr.dwBufferLength = OPENMSX_W32_MIDI_SYSMES_MAXLEN;
        if (midiInPrepareHeader(reinterpret_cast<HMIDIIN>(vfnt_midiin[idx].handle),
                                static_cast<LPMIDIHDR>(&inhdr), sizeof(inhdr)) != MMSYSERR_NOERROR) {
                return unsigned(-1);
        }
        if (midiInAddBuffer(reinterpret_cast<HMIDIIN>(vfnt_midiin[idx].handle), static_cast<LPMIDIHDR>(&inhdr), sizeof(inhdr)) != MMSYSERR_NOERROR) {
                return unsigned(-1);
        }
        if (midiInStart(reinterpret_cast<HMIDIIN>(vfnt_midiin[idx].handle)) != MMSYSERR_NOERROR) {
                return unsigned(-1);
        }
        return idx;
}
 
int w32_midiInClose(unsigned idx)
{
        midiInStop(reinterpret_cast<HMIDIIN>(vfnt_midiin[idx].handle));
        midiInReset(reinterpret_cast<HMIDIIN>(vfnt_midiin[idx].handle));
        midiInUnprepareHeader(reinterpret_cast<HMIDIIN>(vfnt_midiin[idx].handle),
                              static_cast<LPMIDIHDR>(&inhdr), sizeof(inhdr));
        if (midiInClose(reinterpret_cast<HMIDIIN>(vfnt_midiin[idx].handle)) == MMSYSERR_NOERROR) {
                return 0;
        } else {
                return -1;
        }
}
 
} // namespace openmsx
 
#endif // _WIN32