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908 lines
22 KiB
C
908 lines
22 KiB
C
/*
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BeepMidi :: beep.sys MIDI player
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(c) Andrew Greenwood, 2007.
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Released as open-source software. You may copy, re-distribute and modify
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this software, provided this copyright notice remains intact.
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Please see the included README.TXT for more information
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HISTORY :
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16th January 2007 Started
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17th January 2007 Polyphony support and threading added
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18th January 2007 Made threading optional, added comments
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*/
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/* The timeslice to allocate for all playing notes (in milliseconds) */
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#define TIMESLICE_SIZE 60
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/*
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If this is defined, notes are added to the playing list, even if
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they already exist. As a result, the note will sound twice during
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each timeslice. Also each note on will require a corresponding note
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off event.
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*/
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#define ALLOW_DUPLICATE_NOTES
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/*
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The maximum number of notes that may be playing at any one time.
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Higher values result in a messier sound as all the frequencies get
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mashed together. Do not set this below 2. Recommended = 4
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*/
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#define POLYPHONY 3
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/*
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Define CONTINUOUS_NOTES to perform note playback in a separate thread.
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This was originally the intended behaviour, but after experimentation
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doesn't sound as good for MIDI files which have a lot going on. If not
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defined, all playing notes are output in sequence as a new note starts.
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*/
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#define CONTINUOUS_NOTES
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#define WIN32_NO_STATUS
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#define _INC_WINDOWS
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#define COM_NO_WINDOWS_H
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#include <stdarg.h>
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#include <windef.h>
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#include <winbase.h>
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#define NTOS_MODE_USER
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#include <ndk/iofuncs.h>
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#include <ndk/obfuncs.h>
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#include <ndk/rtlfuncs.h>
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#include <ntddbeep.h>
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#include <math.h>
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#include <mmddk.h>
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/*#define DPRINT printf*/
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#define DPRINT FakePrintf
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/* A few MIDI command categories */
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#define MIDI_NOTE_OFF 0x80
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#define MIDI_NOTE_ON 0x90
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#define MIDI_CONTROL_CHANGE 0xB0
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#define MIDI_PROGRAM 0xC0
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#define MIDI_PITCH_BEND 0xE0
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#define MIDI_SYSTEM 0xFF
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/* Specific commands */
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#define MIDI_RESET 0xFF
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typedef struct _NoteNode
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{
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struct _NoteNode* next;
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struct _NoteNode* previous;
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UCHAR note;
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UCHAR velocity; /* 0 is note-off */
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} NoteNode;
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typedef struct _DeviceInfo
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{
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HDRVR mme_handle;
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HANDLE kernel_device;
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DWORD callback;
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DWORD instance;
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DWORD flags;
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UCHAR running_status;
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DWORD playing_notes_count;
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NoteNode* note_list;
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BOOL refresh_notes;
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HANDLE thread_handle;
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BOOL terminate_thread;
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HANDLE thread_termination_complete;
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} DeviceInfo;
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DeviceInfo* the_device;
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CRITICAL_SECTION device_lock;
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void
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FakePrintf(char* str, ...)
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{
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/* Just to shut the compiler up */
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}
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/*
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This is designed to be treated as a thread, however it behaves as a
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normal function if CONTINUOUS_NOTES is not defined.
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*/
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DWORD WINAPI
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ProcessPlayingNotes(
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LPVOID parameter)
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{
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DeviceInfo* device_info = (DeviceInfo*) parameter;
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NTSTATUS status;
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IO_STATUS_BLOCK io_status_block;
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DWORD arp_notes;
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DPRINT("Note processing started\n");
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/* We lock the note list only while accessing it */
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#ifdef CONTINUOUS_NOTES
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while ( ! device_info->terminate_thread )
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#endif
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{
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NoteNode* node;
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/* Number of notes being arpeggiated */
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arp_notes = 1;
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EnterCriticalSection(&device_lock);
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/* Calculate how much time to allocate to each playing note */
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DPRINT("%d notes active\n", (int) device_info->playing_notes_count);
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node = device_info->note_list;
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while ( ( node != NULL ) && ( arp_notes <= POLYPHONY ) )
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{
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BEEP_SET_PARAMETERS beep_data;
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DWORD actually_playing = 0;
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double frequency = node->note;
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DPRINT("playing..\n");
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frequency = frequency / 12;
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frequency = pow(2, frequency);
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frequency = 8.1758 * frequency;
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if (device_info->playing_notes_count > POLYPHONY)
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actually_playing = POLYPHONY;
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else
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actually_playing = device_info->playing_notes_count;
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DPRINT("Frequency %f\n", frequency);
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// TODO
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beep_data.Frequency = (DWORD) frequency;
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beep_data.Duration = TIMESLICE_SIZE / actually_playing; /* device_info->playing_notes_count; */
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status = NtDeviceIoControlFile(device_info->kernel_device,
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NULL,
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NULL,
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NULL,
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&io_status_block,
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IOCTL_BEEP_SET,
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&beep_data,
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sizeof(BEEP_SET_PARAMETERS),
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NULL,
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0);
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if ( ! NT_SUCCESS(status) )
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{
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DPRINT("ERROR %d\n", (int) GetLastError());
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}
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SleepEx(beep_data.Duration, TRUE);
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if ( device_info->refresh_notes )
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{
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device_info->refresh_notes = FALSE;
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break;
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}
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arp_notes ++;
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node = node->next;
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}
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LeaveCriticalSection(&device_lock);
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}
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#ifdef CONTINUOUS_NOTES
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SetEvent(device_info->thread_termination_complete);
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#endif
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return 0;
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}
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/*
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Fills a MIDIOUTCAPS structure with information about our device.
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*/
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MMRESULT
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GetDeviceCapabilities(
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MIDIOUTCAPS* caps)
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{
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/* These are ignored for now */
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caps->wMid = 0;
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caps->wPid = 0;
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caps->vDriverVersion = 0x0100;
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memset(caps->szPname, 0, sizeof(caps->szPname));
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wcscpy(caps->szPname, L"PC speaker");
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caps->wTechnology = MOD_SQSYNTH;
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caps->wVoices = 1; /* We only have one voice */
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caps->wNotes = POLYPHONY;
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caps->wChannelMask = 0xFFBF; /* Ignore channel 10 */
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caps->dwSupport = 0;
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return MMSYSERR_NOERROR;
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}
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/*
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Helper function that just simplifies calling the application making use
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of us.
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*/
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BOOL
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CallClient(
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DeviceInfo* device_info,
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DWORD_PTR message,
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DWORD_PTR parameter1,
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DWORD_PTR parameter2)
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{
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DPRINT("Calling client - callback 0x%x mmhandle 0x%x\n", device_info->callback, device_info->mme_handle);
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return DriverCallback(device_info->callback,
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HIWORD(device_info->flags),
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device_info->mme_handle,
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message,
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device_info->instance,
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parameter1,
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parameter2);
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}
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/*
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Open the kernel-mode device and allocate resources. This opens the
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BEEP.SYS kernel device.
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*/
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MMRESULT
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OpenDevice(
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DeviceInfo** private_data,
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MIDIOPENDESC* open_desc,
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DWORD flags)
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{
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NTSTATUS status;
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HANDLE heap;
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HANDLE kernel_device;
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UNICODE_STRING beep_device_name;
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OBJECT_ATTRIBUTES attribs;
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IO_STATUS_BLOCK status_block;
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/* One at a time.. */
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if ( the_device )
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{
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DPRINT("Already allocated\n");
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return MMSYSERR_ALLOCATED;
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}
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/* Make the device name into a unicode string and open it */
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RtlInitUnicodeString(&beep_device_name,
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L"\\Device\\Beep");
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InitializeObjectAttributes(&attribs,
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&beep_device_name,
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0,
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NULL,
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NULL);
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status = NtCreateFile(&kernel_device,
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FILE_READ_DATA | FILE_WRITE_DATA,
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&attribs,
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&status_block,
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NULL,
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0,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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FILE_OPEN_IF,
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0,
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NULL,
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0);
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if ( ! NT_SUCCESS(status) )
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{
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DPRINT("Could not connect to BEEP device - %d\n", (int) GetLastError());
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return MMSYSERR_ERROR;
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}
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DPRINT("Opened!\n");
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/* Allocate and initialize the device info */
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heap = GetProcessHeap();
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the_device = HeapAlloc(heap, HEAP_ZERO_MEMORY, sizeof(DeviceInfo));
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if ( ! the_device )
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{
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DPRINT("Out of memory\n");
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return MMSYSERR_NOMEM;
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}
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/* Initialize */
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the_device->kernel_device = kernel_device;
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the_device->playing_notes_count = 0;
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the_device->note_list = NULL;
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the_device->thread_handle = 0;
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the_device->terminate_thread = FALSE;
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the_device->running_status = 0;
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// TODO
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the_device->mme_handle = (HDRVR) open_desc->hMidi;
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the_device->callback = open_desc->dwCallback;
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the_device->instance = open_desc->dwInstance;
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the_device->flags = flags;
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/* Store the pointer in the user data */
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*private_data = the_device;
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/* This is threading-related code */
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#ifdef CONTINUOUS_NOTES
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the_device->thread_termination_complete = CreateEvent(NULL, FALSE, FALSE, NULL);
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if ( ! the_device->thread_termination_complete )
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{
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DPRINT("CreateEvent failed\n");
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HeapFree(heap, 0, the_device);
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return MMSYSERR_NOMEM;
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}
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the_device->thread_handle = CreateThread(NULL,
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0,
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ProcessPlayingNotes,
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(PVOID) the_device,
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0,
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NULL);
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if ( ! the_device->thread_handle )
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{
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DPRINT("CreateThread failed\n");
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CloseHandle(the_device->thread_termination_complete);
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HeapFree(heap, 0, the_device);
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return MMSYSERR_NOMEM;
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}
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#endif
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/* Now we call the client application to say the device is open */
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DPRINT("Sending MOM_OPEN\n");
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DPRINT("Success? %d\n", (int) CallClient(the_device, MOM_OPEN, 0, 0));
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return MMSYSERR_NOERROR;
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}
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/*
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Close the kernel-mode device.
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*/
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MMRESULT
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CloseDevice(DeviceInfo* device_info)
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{
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HANDLE heap = GetProcessHeap();
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/* If we're working in threaded mode we need to wait for thread to die */
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#ifdef CONTINUOUS_NOTES
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the_device->terminate_thread = TRUE;
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WaitForSingleObject(the_device->thread_termination_complete, INFINITE);
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CloseHandle(the_device->thread_termination_complete);
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#endif
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/* Let the client application know the device is closing */
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DPRINT("Sending MOM_CLOSE\n");
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CallClient(device_info, MOM_CLOSE, 0, 0);
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NtClose(device_info->kernel_device);
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/* Free resources */
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HeapFree(heap, 0, device_info);
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the_device = NULL;
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return MMSYSERR_NOERROR;
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}
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/*
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Removes a note from the playing notes list. If the note is not playing,
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we just pretend nothing happened.
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*/
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MMRESULT
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StopNote(
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DeviceInfo* device_info,
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UCHAR note)
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{
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HANDLE heap = GetProcessHeap();
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NoteNode* node;
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NoteNode* prev_node = NULL;
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DPRINT("StopNote\n");
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EnterCriticalSection(&device_lock);
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node = device_info->note_list;
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while ( node != NULL )
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{
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if ( node->note == note )
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{
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/* Found the note - just remove the node from the list */
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DPRINT("Stopping note %d\n", (int) node->note);
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if ( prev_node != NULL )
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prev_node->next = node->next;
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else
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device_info->note_list = node->next;
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HeapFree(heap, 0, node);
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device_info->playing_notes_count --;
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DPRINT("Note stopped - now playing %d notes\n", (int) device_info->playing_notes_count);
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LeaveCriticalSection(&device_lock);
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device_info->refresh_notes = TRUE;
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return MMSYSERR_NOERROR;
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}
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prev_node = node;
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node = node->next;
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}
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LeaveCriticalSection(&device_lock);
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/* Hmm, a good idea? */
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#ifndef CONTINUOUS_NOTES
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ProcessPlayingNotes((PVOID) device_info);
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#endif
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return MMSYSERR_NOERROR;
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}
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/*
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Adds a note to the playing notes list. If the note is already playing,
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the definition of ALLOW_DUPLICATE_NOTES determines if an existing note
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may be duplicated. Otherwise, duplicate notes are ignored.
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*/
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MMRESULT
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PlayNote(
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DeviceInfo* device_info,
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UCHAR note,
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UCHAR velocity)
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{
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HANDLE heap = GetProcessHeap();
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NoteNode* node;
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DPRINT("PlayNote\n");
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if ( velocity == 0 )
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{
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DPRINT("Zero velocity\n");
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/* Velocity zero is effectively a "note off" */
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StopNote(device_info, note);
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}
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else
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{
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/* Start playing the note */
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NoteNode* new_node;
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EnterCriticalSection(&device_lock);
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node = device_info->note_list;
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while ( node != NULL )
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{
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#ifndef ALLOW_DUPLICATE_NOTES
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if ( ( node->note == note ) && ( velocity > 0 ) )
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{
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/* The note is already playing - do nothing */
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DPRINT("Duplicate note playback request ignored\n");
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LeaveCriticalSection(&device_lock);
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return MMSYSERR_NOERROR;
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}
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#endif
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node = node->next;
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}
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new_node = HeapAlloc(heap, HEAP_ZERO_MEMORY, sizeof(NoteNode));
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if ( ! new_node )
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{
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LeaveCriticalSection(&device_lock);
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return MMSYSERR_NOMEM;
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}
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new_node->note = note;
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new_node->velocity = velocity;
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/*
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Prepend to the playing notes list. If exceeding polyphony,
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remove the oldest note (which will be at the tail.)
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*/
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if ( device_info->note_list )
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device_info->note_list->previous = new_node;
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new_node->next = device_info->note_list;
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new_node->previous = NULL;
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device_info->note_list = new_node;
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device_info->playing_notes_count ++;
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/*
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if ( device_info->playing_notes_count > POLYPHONY )
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{
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ASSERT(tail_node);
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DPRINT("Polyphony exceeded\n");
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tail_node->previous->next = NULL;
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HeapFree(heap, 0, tail_node);
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device_info->playing_notes_count --;
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}
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*/
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LeaveCriticalSection(&device_lock);
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DPRINT("Note started - now playing %d notes\n", (int) device_info->playing_notes_count);
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device_info->refresh_notes = TRUE;
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}
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#ifndef CONTINUOUS_NOTES
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ProcessPlayingNotes((PVOID) device_info);
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#endif
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return MMSYSERR_NOERROR;
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}
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/*
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Decipher a short MIDI message (which is a MIDI message packed into a DWORD.)
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This will set "running status", but does not take this into account when
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processing messages (is this necessary?)
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*/
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MMRESULT
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ProcessShortMidiMessage(
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DeviceInfo* device_info,
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DWORD message)
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{
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DWORD status;
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DWORD category;
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DWORD channel;
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DWORD data1, data2;
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status = message & 0x000000FF;
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/* Deal with running status */
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if ( status < MIDI_NOTE_OFF )
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{
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status = device_info->running_status;
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}
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/* Ensure the status is sane! */
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if ( status < MIDI_NOTE_OFF )
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{
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/* It's garbage, ignore it */
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return MMSYSERR_NOERROR;
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}
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/* Figure out the message category and channel */
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category = status & 0xF0;
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channel = status & 0x0F; /* we don't use this */
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|
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data1 = (message & 0x0000FF00) >> 8;
|
|
data2 = (message & 0x00FF0000) >> 16;
|
|
|
|
DPRINT("0x%x, %d, %d\n", (int) status, (int) data1, (int) data2);
|
|
|
|
/* Filter drums (which are *usually* on channel 10) */
|
|
if ( channel == 10 )
|
|
{
|
|
return MMSYSERR_NOERROR;
|
|
}
|
|
|
|
/* Pass to the appropriate message handler */
|
|
|
|
switch ( category )
|
|
{
|
|
case MIDI_NOTE_ON :
|
|
{
|
|
PlayNote(device_info, data1, data2);
|
|
break;
|
|
}
|
|
|
|
case MIDI_NOTE_OFF :
|
|
{
|
|
StopNote(device_info, data1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return MMSYSERR_NOERROR;
|
|
}
|
|
|
|
|
|
#define PACK_MIDI(b1, b2, b3) \
|
|
((b3 * 65536) + (b2 * 256) + b1);
|
|
|
|
|
|
/*
|
|
Processes a "long" MIDI message (ie, a MIDI message contained within a
|
|
buffer.) This is intended for supporting SysEx data, or blocks of MIDI
|
|
events. However in our case we're only interested in short MIDI messages,
|
|
so we scan the buffer, and each time we encounter a valid status byte
|
|
we start recording it as a new event. Once 3 bytes or a new status is
|
|
received, the event is passed to the short message handler.
|
|
*/
|
|
|
|
MMRESULT
|
|
ProcessLongMidiMessage(
|
|
DeviceInfo* device_info,
|
|
MIDIHDR* header)
|
|
{
|
|
unsigned int index = 0;
|
|
UCHAR* midi_bytes = (UCHAR*) header->lpData;
|
|
|
|
unsigned int msg_index = 0;
|
|
UCHAR msg[3];
|
|
|
|
/* Initialize the buffer */
|
|
msg[0] = msg[1] = msg[2] = 0;
|
|
|
|
if ( ! ( header->dwFlags & MHDR_PREPARED ) )
|
|
{
|
|
DPRINT("Not prepared!\n");
|
|
return MIDIERR_UNPREPARED;
|
|
}
|
|
|
|
DPRINT("Processing %d bytes of MIDI\n", (int) header->dwBufferLength);
|
|
|
|
while ( index < header->dwBufferLength )
|
|
{
|
|
/* New status byte? ( = new event) */
|
|
if ( midi_bytes[index] & 0x80 )
|
|
{
|
|
DWORD short_msg;
|
|
|
|
/* Deal with the existing event */
|
|
|
|
if ( msg[0] & 0x80 )
|
|
{
|
|
short_msg = PACK_MIDI(msg[0], msg[1], msg[2]);
|
|
|
|
DPRINT("Complete msg is 0x%x %d %d\n", (int) msg[0], (int) msg[1], (int) msg[2]);
|
|
ProcessShortMidiMessage(device_info, short_msg);
|
|
}
|
|
|
|
/* Set new running status and start recording the event */
|
|
DPRINT("Set new running status\n");
|
|
device_info->running_status = midi_bytes[index];
|
|
msg[0] = midi_bytes[index];
|
|
msg_index = 1;
|
|
}
|
|
|
|
/* Unexpected data byte? ( = re-use previous status) */
|
|
else if ( msg_index == 0 )
|
|
{
|
|
if ( device_info->running_status & 0x80 )
|
|
{
|
|
DPRINT("Retrieving running status\n");
|
|
msg[0] = device_info->running_status;
|
|
msg[1] = midi_bytes[index];
|
|
msg_index = 2;
|
|
}
|
|
else
|
|
DPRINT("garbage\n");
|
|
}
|
|
|
|
/* Expected data ( = append to message until buffer full) */
|
|
else
|
|
{
|
|
DPRINT("Next byte...\n");
|
|
msg[msg_index] = midi_bytes[index];
|
|
msg_index ++;
|
|
|
|
if ( msg_index > 2 )
|
|
{
|
|
DWORD short_msg;
|
|
|
|
short_msg = PACK_MIDI(msg[0], msg[1], msg[2]);
|
|
|
|
DPRINT("Complete msg is 0x%x %d %d\n", (int) msg[0], (int) msg[1], (int) msg[2]);
|
|
ProcessShortMidiMessage(device_info, short_msg);
|
|
|
|
/* Reinit */
|
|
msg_index = 0;
|
|
msg[0] = msg[1] = msg[2] = 0;
|
|
}
|
|
}
|
|
|
|
index ++;
|
|
}
|
|
|
|
/*
|
|
We're meant to clear MHDR_DONE and set MHDR_INQUEUE but since we
|
|
deal with everything here and now we might as well just say so.
|
|
*/
|
|
header->dwFlags |= MHDR_DONE;
|
|
header->dwFlags &= ~ MHDR_INQUEUE;
|
|
|
|
DPRINT("Success? %d\n", CallClient(the_device, MOM_DONE, (DWORD_PTR) header, 0));
|
|
|
|
return MMSYSERR_NOERROR;
|
|
}
|
|
|
|
|
|
/*
|
|
Exported function that receives messages from WINMM (the MME API.)
|
|
*/
|
|
|
|
MMRESULT
|
|
FAR PASCAL
|
|
modMessage(
|
|
UINT device_id,
|
|
UINT message,
|
|
DWORD_PTR private_data,
|
|
DWORD_PTR parameter1,
|
|
DWORD_PTR parameter2)
|
|
{
|
|
switch ( message )
|
|
{
|
|
case MODM_GETNUMDEVS :
|
|
{
|
|
/* Only one internal PC speaker device (and even that's too much) */
|
|
DPRINT("MODM_GETNUMDEVS\n");
|
|
return 1;
|
|
}
|
|
|
|
case MODM_GETDEVCAPS :
|
|
{
|
|
DPRINT("MODM_GETDEVCAPS\n");
|
|
return GetDeviceCapabilities((MIDIOUTCAPS*) parameter1);
|
|
}
|
|
|
|
case MODM_OPEN :
|
|
{
|
|
DPRINT("MODM_OPEN\n");
|
|
|
|
return OpenDevice((DeviceInfo**) private_data,
|
|
(MIDIOPENDESC*) parameter1,
|
|
parameter2);
|
|
}
|
|
|
|
case MODM_CLOSE :
|
|
{
|
|
DPRINT("MODM_CLOSE\n");
|
|
return CloseDevice((DeviceInfo*) private_data);
|
|
}
|
|
|
|
case MODM_DATA :
|
|
{
|
|
return ProcessShortMidiMessage((DeviceInfo*) private_data, parameter1);
|
|
}
|
|
|
|
case MODM_PREPARE :
|
|
{
|
|
/* We don't bother with this */
|
|
MIDIHDR* hdr = (MIDIHDR*) parameter1;
|
|
hdr->dwFlags |= MHDR_PREPARED;
|
|
return MMSYSERR_NOERROR;
|
|
}
|
|
|
|
case MODM_UNPREPARE :
|
|
{
|
|
MIDIHDR* hdr = (MIDIHDR*) parameter1;
|
|
hdr->dwFlags &= ~MHDR_PREPARED;
|
|
return MMSYSERR_NOERROR;
|
|
}
|
|
|
|
case MODM_LONGDATA :
|
|
{
|
|
DPRINT("LONGDATA\n");
|
|
return ProcessLongMidiMessage((DeviceInfo*) private_data, (MIDIHDR*) parameter1);
|
|
}
|
|
|
|
case MODM_RESET :
|
|
{
|
|
/* TODO */
|
|
break;
|
|
}
|
|
}
|
|
|
|
DPRINT("Not supported %d\n", message);
|
|
|
|
return MMSYSERR_NOTSUPPORTED;
|
|
}
|
|
|
|
|
|
/*
|
|
Driver entrypoint.
|
|
*/
|
|
|
|
LONG
|
|
FAR PASCAL
|
|
DriverProc(
|
|
DWORD driver_id,
|
|
HDRVR driver_handle,
|
|
UINT message,
|
|
LONG parameter1,
|
|
LONG parameter2)
|
|
{
|
|
switch ( message )
|
|
{
|
|
case DRV_LOAD :
|
|
DPRINT("DRV_LOAD\n");
|
|
the_device = NULL;
|
|
return 1L;
|
|
|
|
case DRV_FREE :
|
|
DPRINT("DRV_FREE\n");
|
|
return 1L;
|
|
|
|
case DRV_OPEN :
|
|
DPRINT("DRV_OPEN\n");
|
|
InitializeCriticalSection(&device_lock);
|
|
return 1L;
|
|
|
|
case DRV_CLOSE :
|
|
DPRINT("DRV_CLOSE\n");
|
|
return 1L;
|
|
|
|
case DRV_ENABLE :
|
|
DPRINT("DRV_ENABLE\n");
|
|
return 1L;
|
|
|
|
case DRV_DISABLE :
|
|
DPRINT("DRV_DISABLE\n");
|
|
return 1L;
|
|
|
|
/*
|
|
We don't provide configuration capabilities. This used to be
|
|
for things like I/O port, IRQ, DMA settings, etc.
|
|
*/
|
|
|
|
case DRV_QUERYCONFIGURE :
|
|
DPRINT("DRV_QUERYCONFIGURE\n");
|
|
return 0L;
|
|
|
|
case DRV_CONFIGURE :
|
|
DPRINT("DRV_CONFIGURE\n");
|
|
return 0L;
|
|
|
|
case DRV_INSTALL :
|
|
DPRINT("DRV_INSTALL\n");
|
|
return DRVCNF_RESTART;
|
|
};
|
|
|
|
DPRINT("???\n");
|
|
|
|
return DefDriverProc(driver_id,
|
|
driver_handle,
|
|
message,
|
|
parameter1,
|
|
parameter2);
|
|
}
|