soundcard.h

IXP425的BSP代码

 * the event: 
 *
 *	0x8X = system level events,
 *	0x9X = device/port specific events, event[1] = device/port,
 *		The last 4 bits give the subtype:
 *			0x02	= Channel event (event[3] = chn).
 *			0x01	= note event (event[4] = note).
 *			(0x01 is not used alone but always with bit 0x02).
 *	       event[2] = MIDI message code (0x80=note off etc.)
 *
 */

#define EV_SEQ_LOCAL		0x80
#define EV_TIMING		0x81
#define EV_CHN_COMMON		0x92
#define EV_CHN_VOICE		0x93
#define EV_SYSEX		0x94
/*
 * Event types 200 to 220 are reserved for application use.
 * These numbers will not be used by the driver.
 */

/*
 * Events for event type EV_CHN_VOICE
 */

#define MIDI_NOTEOFF		0x80
#define MIDI_NOTEON		0x90
#define MIDI_KEY_PRESSURE	0xA0

/*
 * Events for event type EV_CHN_COMMON
 */

#define MIDI_CTL_CHANGE		0xB0
#define MIDI_PGM_CHANGE		0xC0
#define MIDI_CHN_PRESSURE	0xD0
#define MIDI_PITCH_BEND		0xE0

#define MIDI_SYSTEM_PREFIX	0xF0

/*
 * Timer event types
 */
#define TMR_WAIT_REL		1	/* Time relative to the prev time */
#define TMR_WAIT_ABS		2	/* Absolute time since TMR_START */
#define TMR_STOP		3
#define TMR_START		4
#define TMR_CONTINUE		5
#define TMR_TEMPO		6
#define TMR_ECHO		8
#define TMR_CLOCK		9	/* MIDI clock */
#define TMR_SPP			10	/* Song position pointer */
#define TMR_TIMESIG		11	/* Time signature */

/*
 *	Local event types
 */
#define LOCL_STARTAUDIO		1
#define LOCL_STARTAUDIO2	2
#define LOCL_STARTAUDIO3	3
#define LOCL_STARTAUDIO4	4

#if (!defined(__KERNEL__) && !defined(KERNEL) && !defined(INKERNEL) && !defined(_KERNEL)) || defined(USE_SEQ_MACROS) 
/*
 *	Some convenience macros to simplify programming of the
 *	/dev/sequencer interface
 *
 *	These macros define the API which should be used when possible.
 */
#define SEQ_DECLAREBUF()		SEQ_USE_EXTBUF()

void seqbuf_dump(void);	/* This function must be provided by programs */

EXTERNC int OSS_init(int seqfd, int buflen);
EXTERNC void OSS_seqbuf_dump(int fd, unsigned char *buf, int buflen);
EXTERNC void OSS_seq_advbuf(int len, int fd, unsigned char *buf, int buflen);
EXTERNC void OSS_seq_needbuf(int len, int fd, unsigned char *buf, int buflen);
EXTERNC void OSS_patch_caching(int dev, int chn, int patch,
			      int fd, unsigned char *buf, int buflen);
EXTERNC void OSS_drum_caching(int dev, int chn, int patch,
			      int fd, unsigned char *buf, int buflen);
EXTERNC void OSS_write_patch(int fd, unsigned char *buf, int len);
EXTERNC int OSS_write_patch2(int fd, unsigned char *buf, int len);

#define SEQ_PM_DEFINES int __foo_bar___
#ifdef OSSLIB
#  define SEQ_USE_EXTBUF() \
		EXTERNC unsigned char *_seqbuf; \
		EXTERNC int _seqbuflen;EXTERNC int _seqbufptr
#  define SEQ_DEFINEBUF(len) SEQ_USE_EXTBUF();static int _requested_seqbuflen=len
#  define _SEQ_ADVBUF(len) OSS_seq_advbuf(len, seqfd, _seqbuf, _seqbuflen)
#  define _SEQ_NEEDBUF(len) OSS_seq_needbuf(len, seqfd, _seqbuf, _seqbuflen)
#  define SEQ_DUMPBUF() OSS_seqbuf_dump(seqfd, _seqbuf, _seqbuflen)

#  define SEQ_LOAD_GMINSTR(dev, instr) \
		OSS_patch_caching(dev, -1, instr, seqfd, _seqbuf, _seqbuflen)
#  define SEQ_LOAD_GMDRUM(dev, drum) \
		OSS_drum_caching(dev, -1, drum, seqfd, _seqbuf, _seqbuflen)
#else /* !OSSLIB */

#  define SEQ_LOAD_GMINSTR(dev, instr)
#  define SEQ_LOAD_GMDRUM(dev, drum)

#  define SEQ_USE_EXTBUF() \
		EXTERNC unsigned char _seqbuf[]; \
		EXTERNC int _seqbuflen;EXTERNC int _seqbufptr

#ifndef USE_SIMPLE_MACROS
/* Sample seqbuf_dump() implementation:
 *
 *	SEQ_DEFINEBUF (2048);	-- Defines a buffer for 2048 bytes
 *
 *	int seqfd;		-- The file descriptor for /dev/sequencer.
 *
 *	void
 *	seqbuf_dump ()
 *	{
 *	  if (_seqbufptr)
 *	    if (write (seqfd, _seqbuf, _seqbufptr) == -1)
 *	      {
 *		perror ("write /dev/sequencer");
 *		exit (-1);
 *	      }
 *	  _seqbufptr = 0;
 *	}
 */

#define SEQ_DEFINEBUF(len)		unsigned char _seqbuf[len]; int _seqbuflen = len;int _seqbufptr = 0
#define _SEQ_NEEDBUF(len)		if ((_seqbufptr+(len)) > _seqbuflen) seqbuf_dump()
#define _SEQ_ADVBUF(len)		_seqbufptr += len
#define SEQ_DUMPBUF			seqbuf_dump
#else
/*
 * This variation of the sequencer macros is used just to format one event
 * using fixed buffer.
 * 
 * The program using the macro library must define the following macros before
 * using this library.
 *
 * #define _seqbuf 		 name of the buffer (unsigned char[]) 
 * #define _SEQ_ADVBUF(len)	 If the applic needs to know the exact
 *				 size of the event, this macro can be used.
 *				 Otherwise this must be defined as empty.
 * #define _seqbufptr		 Define the name of index variable or 0 if
 *				 not required. 
 */
#define _SEQ_NEEDBUF(len)	/* empty */
#endif
#endif /* !OSSLIB */

#define SEQ_VOLUME_MODE(dev, mode)	{_SEQ_NEEDBUF(8);\
					_seqbuf[_seqbufptr] = SEQ_EXTENDED;\
					_seqbuf[_seqbufptr+1] = SEQ_VOLMODE;\
					_seqbuf[_seqbufptr+2] = (dev);\
					_seqbuf[_seqbufptr+3] = (mode);\
					_seqbuf[_seqbufptr+4] = 0;\
					_seqbuf[_seqbufptr+5] = 0;\
					_seqbuf[_seqbufptr+6] = 0;\
					_seqbuf[_seqbufptr+7] = 0;\
					_SEQ_ADVBUF(8);}

/*
 * Midi voice messages
 */

#define _CHN_VOICE(dev, event, chn, note, parm) \
					{_SEQ_NEEDBUF(8);\
					_seqbuf[_seqbufptr] = EV_CHN_VOICE;\
					_seqbuf[_seqbufptr+1] = (dev);\
					_seqbuf[_seqbufptr+2] = (event);\
					_seqbuf[_seqbufptr+3] = (chn);\
					_seqbuf[_seqbufptr+4] = (note);\
					_seqbuf[_seqbufptr+5] = (parm);\
					_seqbuf[_seqbufptr+6] = (0);\
					_seqbuf[_seqbufptr+7] = 0;\
					_SEQ_ADVBUF(8);}

#define SEQ_START_NOTE(dev, chn, note, vol) \
		_CHN_VOICE(dev, MIDI_NOTEON, chn, note, vol)

#define SEQ_STOP_NOTE(dev, chn, note, vol) \
		_CHN_VOICE(dev, MIDI_NOTEOFF, chn, note, vol)

#define SEQ_KEY_PRESSURE(dev, chn, note, pressure) \
		_CHN_VOICE(dev, MIDI_KEY_PRESSURE, chn, note, pressure)

/*
 * Midi channel messages
 */

#define _CHN_COMMON(dev, event, chn, p1, p2, w14) \
					{_SEQ_NEEDBUF(8);\
					_seqbuf[_seqbufptr] = EV_CHN_COMMON;\
					_seqbuf[_seqbufptr+1] = (dev);\
					_seqbuf[_seqbufptr+2] = (event);\
					_seqbuf[_seqbufptr+3] = (chn);\
					_seqbuf[_seqbufptr+4] = (p1);\
					_seqbuf[_seqbufptr+5] = (p2);\
					*(short *)&_seqbuf[_seqbufptr+6] = (w14);\
					_SEQ_ADVBUF(8);}
/*
 * SEQ_SYSEX permits sending of sysex messages. (It may look that it permits
 * sending any MIDI bytes but it's absolutely not possible. Trying to do
 * so _will_ cause problems with MPU401 intelligent mode).
 *
 * Sysex messages are sent in blocks of 1 to 6 bytes. Longer messages must be 
 * sent by calling SEQ_SYSEX() several times (there must be no other events
 * between them). First sysex fragment must have 0xf0 in the first byte
 * and the last byte (buf[len-1] of the last fragment must be 0xf7. No byte
 * between these sysex start and end markers cannot be larger than 0x7f. Also
 * lengths of each fragments (except the last one) must be 6.
 *
 * Breaking the above rules may work with some MIDI ports but is likely to
 * cause fatal problems with some other devices (such as MPU401).
 */
#define SEQ_SYSEX(dev, buf, len) \
					{int ii, ll=(len); \
					 unsigned char *bufp=buf;\
					 if (ll>6)ll=6;\
					_SEQ_NEEDBUF(8);\
					_seqbuf[_seqbufptr] = EV_SYSEX;\
					_seqbuf[_seqbufptr+1] = (dev);\
					for(ii=0;ii<ll;ii++)\
					   _seqbuf[_seqbufptr+ii+2] = bufp[ii];\
					for(ii=ll;ii<6;ii++)\
					   _seqbuf[_seqbufptr+ii+2] = 0xff;\
					_SEQ_ADVBUF(8);}

#define SEQ_CHN_PRESSURE(dev, chn, pressure) \
		_CHN_COMMON(dev, MIDI_CHN_PRESSURE, chn, pressure, 0, 0)

#define SEQ_SET_PATCH SEQ_PGM_CHANGE
#ifdef OSSLIB
#   define SEQ_PGM_CHANGE(dev, chn, patch) \
		{OSS_patch_caching(dev, chn, patch, seqfd, _seqbuf, _seqbuflen); \
		 _CHN_COMMON(dev, MIDI_PGM_CHANGE, chn, patch, 0, 0);}
#else
#   define SEQ_PGM_CHANGE(dev, chn, patch) \
		_CHN_COMMON(dev, MIDI_PGM_CHANGE, chn, patch, 0, 0)
#endif

#define SEQ_CONTROL(dev, chn, controller, value) \
		_CHN_COMMON(dev, MIDI_CTL_CHANGE, chn, controller, 0, value)

#define SEQ_BENDER(dev, chn, value) \
		_CHN_COMMON(dev, MIDI_PITCH_BEND, chn, 0, 0, value)


#define SEQ_V2_X_CONTROL(dev, voice, controller, value)	{_SEQ_NEEDBUF(8);\
					_seqbuf[_seqbufptr] = SEQ_EXTENDED;\
					_seqbuf[_seqbufptr+1] = SEQ_CONTROLLER;\
					_seqbuf[_seqbufptr+2] = (dev);\
					_seqbuf[_seqbufptr+3] = (voice);\
					_seqbuf[_seqbufptr+4] = (controller);\
					_seqbuf[_seqbufptr+5] = ((value)&0xff);\
					_seqbuf[_seqbufptr+6] = ((value>>8)&0xff);\
					_seqbuf[_seqbufptr+7] = 0;\
					_SEQ_ADVBUF(8);}
/*
 * The following 5 macros are incorrectly implemented and obsolete.
 * Use SEQ_BENDER and SEQ_CONTROL (with proper controller) instead.
 */
#define SEQ_PITCHBEND(dev, voice, value) SEQ_V2_X_CONTROL(dev, voice, CTRL_PITCH_BENDER, value)
#define SEQ_BENDER_RANGE(dev, voice, value) SEQ_V2_X_CONTROL(dev, voice, CTRL_PITCH_BENDER_RANGE, value)
#define SEQ_EXPRESSION(dev, voice, value) SEQ_CONTROL(dev, voice, CTL_EXPRESSION, value*128)
#define SEQ_MAIN_VOLUME(dev, voice, value) SEQ_CONTROL(dev, voice, CTL_MAIN_VOLUME, (value*16383)/100)
#define SEQ_PANNING(dev, voice, pos) SEQ_CONTROL(dev, voice, CTL_PAN, (pos+128) / 2)
#if 0
#define SEQ_PANNING(dev, voice, pos)	{_SEQ_NEEDBUF(8);\
					_seqbuf[_seqbufptr] = SEQ_EXTENDED;\
					_seqbuf[_seqbufptr+1] = SEQ_BALANCE;\
					_seqbuf[_seqbufptr+2] = (dev);\
					_seqbuf[_seqbufptr+3] = (voice);\
					(char)_seqbuf[_seqbufptr+4] = (pos);\
					_seqbuf[_seqbufptr+5] = 0;\
					_seqbuf[_seqbufptr+6] = 0;\
					_seqbuf[_seqbufptr+7] = 1;\
					_SEQ_ADVBUF(8);}
#endif

/*
 * Timing and syncronization macros
 */

#define _TIMER_EVENT(ev, parm)		{_SEQ_NEEDBUF(8);\
				 	_seqbuf[_seqbufptr+0] = EV_TIMING; \
				 	_seqbuf[_seqbufptr+1] = (ev); \
					_seqbuf[_seqbufptr+2] = 0;\
					_seqbuf[_seqbufptr+3] = 0;\
				 	*(unsigned int *)&_seqbuf[_seqbufptr+4] = (parm); \
					_SEQ_ADVBUF(8);}

#define SEQ_START_TIMER()		_TIMER_EVENT(TMR_START, 0)
#define SEQ_STOP_TIMER()		_TIMER_EVENT(TMR_STOP, 0)
#define SEQ_CONTINUE_TIMER()		_TIMER_EVENT(TMR_CONTINUE, 0)
#define SEQ_WAIT_TIME(ticks)		_TIMER_EVENT(TMR_WAIT_ABS, ticks)
#define SEQ_DELTA_TIME(ticks)		_TIMER_EVENT(TMR_WAIT_REL, ticks)
#define SEQ_ECHO_BACK(key)		_TIMER_EVENT(TMR_ECHO, key)
#define SEQ_SET_TEMPO(value)		_TIMER_EVENT(TMR_TEMPO, value)
#define SEQ_SONGPOS(pos)		_TIMER_EVENT(TMR_SPP, pos)
#define SEQ_TIME_SIGNATURE(sig)		_TIMER_EVENT(TMR_TIMESIG, sig)

/*
 * Local control events
 */

#define _LOCAL_EVENT(ev, parm)		{_SEQ_NEEDBUF(8);\
				 	_seqbuf[_seqbufptr+0] = EV_SEQ_LOCAL; \
				 	_seqbuf[_seqbufptr+1] = (ev); \
					_seqbuf[_seqbufptr+2] = 0;\
					_seqbuf[_seqbufptr+3] = 0;\
				 	*(unsigned int *)&_seqbuf[_seqbufptr+4] = (parm); \
					_SEQ_ADVBUF(8);}

#define SEQ_PLAYAUDIO(devmask)		_LOCAL_EVENT(LOCL_STARTAUDIO, devmask)
#define SEQ_PLAYAUDIO2(devmask)		_LOCAL_EVENT(LOCL_STARTAUDIO2, devmask)
#define SEQ_PLAYAUDIO3(devmask)		_LOCAL_EVENT(LOCL_STARTAUDIO3, devmask)
#define SEQ_PLAYAUDIO4(devmask)		_LOCAL_EVENT(LOCL_STARTAUDIO4, devmask)
/*
 * Events for the level 1 interface only 
 */

#define SEQ_MIDIOUT(device, byte)	{_SEQ_NEEDBUF(4);\
					_seqbuf[_seqbufptr] = SEQ_MIDIPUTC;\
					_seqbuf[_seqbufptr+1] = (byte);\
					_seqbuf[_seqbufptr+2] = (device);\
					_seqbuf[_seqbufptr+3] = 0;\
					_SEQ_ADVBUF(4);}

/*
 * Patch loading.
 */
#ifdef OSSLIB
#   define SEQ_WRPATCH(patchx, len) \
		OSS_write_patch(seqfd, (char*)(patchx), len)
#   define SEQ_WRPATCH2(patchx, len) \
		OSS_write_patch2(seqfd, (char*)(patchx), len)
#else
#   define SEQ_WRPATCH(patchx, len) \
		{if (_seqbufptr) SEQ_DUMPBUF();\
		 if (write(seqfd, (char*)(patchx), len)==-1) \
		    perror("Write patch: /dev/sequencer");}
#   define SEQ_WRPATCH2(patchx, len) \
		(SEQ_DUMPBUF(), write(seqfd, (char*)(patchx), len))
#endif

#endif
#endif