DSPObject.h

#ifndef __MK_DSPObject_H___
#define __MK_DSPObject_H___
/* $Id: DSPObject.h 463 2000-04-28 16:29:47Z leigh $
 * Low level DSP access and control functions.
 * Copyright 1988-1992, NeXT Inc.  All rights reserved.
 * Author: Julius O. Smith III
 *
 * Intel and QuintProcessor support copyright CCRMA, Stanford University, 
 * 1992. Added by David Jaffe
 */

/*
 * This file is organized logically with respect to the DSPOpen*()
 * routines in that functions apearing before the open routines must be
 * called before the DSP is opened (or any time), and functions apearing 
 * after the open routines must be (or are typically) called after the 
 * DSP is opened.
 *
 * The functions which depend on the Music Kit DSP monitor have the
 * prefix "DSPMK".  The prefix "DSP" may either be independent of the
 * monitor used, or require the array processing monitor.  Generally,
 * functions with prefix "DSP are monitor-independent unless they involve
 * input/output to or from private DSP memory, i.e., unless they require
 * services of a DSP monitor to carry out their function.
 * To upgrade your own DSP monitor to support these DSP functions, lift
 * out the I/O support in the array processing monitor.  The sources are
 * distributed online in /usr/local/lib/dsp/smsrc (system monitor source).
 */

#import <stdio.h>
#import "dsp_types.h"
#import "dsp_structs.h"

extern int DSPGetHostTime(void);
/*
 * Returns the time in microseconds since it was last called.
 */


/*********** Utilities global with respect to all DSP instances **************/

/* WARNING: The following must be kept in synch with dspdriverAccess.h */
#ifndef DSP_MAXDSPS
#define DSP_MAXDSPS 32 /* DSP31 is the highest */
#define DSPDRIVER_PAR_MONITOR "Monitor"
#define DSPDRIVER_PAR_MONITOR_4_2 "Monitor_4_2"
#define DSPDRIVER_PAR_SERIALPORTDEVICE "SerialPortDevice"
#define DSPDRIVER_PAR_ORCHESTRA "Orchestra"
#define DSPDRIVER_PAR_WAITSTATES "WaitStates"
#define DSPDRIVER_PAR_SUBUNITS "SubUnits"
#define DSPDRIVER_PAR_CLOCKRATE "ClockRate"
#endif
/* End of "Warning" section */

/********** Intel utilities ***************************/
char *DSPGetDriverParameter(const char *parameterName);
/* Returns the specified driver parameter of the current DSP.  
   This value can be overridden by the user's defaults data base.
   The returned value is an NXAtom and should not be freed. 
 */

int DSPGetDriverCount(void);
/* Returns the total number of DSP drivers that have been installed/added to 
 * the system.  This is the size of the arrays returned by DSPGetDriverNames()
 * and DSPGetDriverUnits().
 */

char **DSPGetDriverNames(void);
int *DSPGetDriverUnits(void);
int *DSPGetDriverSubUnits(void);
unsigned long *DSPGetDriverSUVects(void);
/* Return the names and units of all the DSP drivers. The size of these arrays
 * is DSPGetDriverCount(). */

char **DSPGetInUseDriverNames(void);
int *DSPGetInUseDriverUnits(void);
int *DSPGetInUseDriverSubUnits(void);
/* Return the names and units of the drivers in use.  The size of these arrays
 * is DSP_MAXDSPS
 */
/********** end of Intel utilities ***************************/


extern int DSPGetDSPCount(void);
/* 
 * Returns the number of actual DSPs on NeXT hardware systems.
 * On all other architectures, returns the value DSP_MAXDSPS,
 * which is the maximum possible number of DSPs.
 */

extern int DSPSetHostName(char *newHost);
/*
 * Set name of host on which to open the DSP.  
 * The default is NULL which means that of the local processor.
 * Currently, only one DSP can be open at a time.
 */

extern char *DSPGetHostName(void);
/*
 * Get name of host on which the DSP is being or will be used.
 * NULL means that of the local processor.
 * Use gethostname(2) to retrieve the local processor's host name.
 */

extern int DSPSetCurrentDSP(int newidsp);
/* 
 * Set DSP number.  Calls to functions in this file will act on that DSP.
 */

extern int DSPGetCurrentDSP(void);
/* 
 * Returns currently selected DSP number.
 */

/*************** Getting and setting "DSP instance variables" ****************/

/*
 * DSP "get" functions do not follow the convention of returning an error code.
 * Instead (because there can be no error), they return the requested value.
 * Each functions in this class has a name beginning with "DSPGet".
 */


extern int DSPGetMessagePriority(void);
/*
 * Return DSP Mach message priority:
 *
 *       DSP_MSG_HIGH           0
 *       DSP_MSG_MED            1
 *       DSP_MSG_LOW            2
 *
 * Only medium and low priorities are used by user-initiated messages.
 * Normally, low priority should be used, and high priority messages
 * will bypass low priority messages enqueued in the driver.  Note,
 * however, that a multi-component message cannot be interrupted once it 
 * has begun.  The Music Kit uses low priority for all timed messages
 * and high priority for all untimed messages (so that untimed messages
 * may bypass any enqueued timed messages).
 *
 */


extern int DSPSetMessagePriority(int pri);
/*
 * Set DSP message priority for future messages sent to the kernel.
 * Can be called before or after DSP is opened.
 */


extern double DSPMKGetSamplingRate(void);
/*
 * Returns sampling rate assumed by DSP software in Hz.
 */


extern int DSPMKSetSamplingRate(double srate);
/*
 * Set sampling rate assumed by DSP software to rate in samples per
 * second (Hz).  Note that only sampling rates 22050.0 and 44100.0 
 * are supported for real time digital audio output.  Use of other sampling
 * rates implies non-real-time processing or sound-out through the DSP serial
 * port to external hardware.
 */


extern int DSPEnableMachMessageOptimization(void);
extern int DSPDisableMachMessageOptimization(void);
/*
 * By default, optimization is enabled.  In this mode, as many Mach
 * message components as possible are combined into a single, multicomponent
 * message.  This minimizes context-switching between the application and
 * the kernel.  The ability to turn it off exists solely to provide a 
 * workaround in the event a bug turns up in it.  We know there is a problem
 * with non-dma 16-bit and 8-bit data messages which are not at the beginning
 * of the message, and in these cases optimization is always disabled.
 */


/*********** Enable/Disable/Query for DSP open-state variables ************/

/* 
 * In general, the enable/disable functions must be called BEFORE the DSP
 * is "opened" via DSPInit(), DSPAPInit(), DSPMKInit(), DSPBoot(), or one of
 * the DSPOpen*() functions.  They have the effect of selecting various open
 * modes for the DSP.  The function which ultimately acts on them is
 * DSPOpenNoBoot() (which is called by the Init and Boot functions above).
 */


extern int DSPGetOpenPriority(void);
/*
 * Return DSP open priority.
 *      0 = low priority (default).
 *      1 = high priority (used by DSP debugger, for example)
 * If the open priority is high when DSPOpenNoBoot is called,
 * the open will proceed in spite of the DSP already being in use.
 * In this case, a new pointer to the DSP owner port is returned.
 * Typically, the task already in control of the DSP is frozen and
 * the newly opening task is a DSP debugger stepping in to look around.
 * Otherwise, the two tasks may confuse the DSP with interleaved commands.
 * Note that deallocating the owner port will give up ownership capability
 * for all owners.
 */


extern int DSPSetOpenPriority(int pri);
/*
 * Set DSP open priority.
 * The new priority has effect when DSPOpenNoBoot is next called.
 *      0 = low priority (default).
 *      1 = high priority (used by DSP debugger, for example)
 */


extern int DSPGetMessageAtomicity(void);
/*
 * Returns nonzero if libdsp Mach messages are atomic, zero otherwise.
 */


extern int DSPSetMessageAtomicity(int atomicity);
/*
 * If atomicity is nonzero, future libdsp Mach messages will be atomic.
 * Otherwise they will not be atomic.  If not atomic, DMA complete interrupts,
 * and DSP DMA requests, for example, can get in between message components,
 * unless they are at priority DSP_MSG_HIGH.
 * (DMA related messages queued by the driver in response to DSP or user
 * DMA initiation are at priority DSP_MSG_HIGH, while libdsp uses 
 * DSP_MSG_LOW for timed messages and DSP_MSG_MED for untimed messages to
 * the DSP.
 */


int DSPEnableHostMsg(void);
/* 
 * Enable DSP host message protocol.
 * This has the side effect that all unsolicited "DSP messages"
 * (writes from the DSP to the host) are split into two streams.
 * All 24-bit words from the DSP with the most significant bit set
 * are interpreted as error messages and split off to an error port.
 * On the host side, a thread is spawned which sits in msg_receive()
 * waiting for DSP error messages, and it forwards then to the DSP 
 * error log, if enabled.  Finally, the DSP can signal an abort by
 * setting both HF2 and HF3. In the driver, the protocol bits set by
 * enabling this mode are (cf. <sound/sounddriver.h>):
 * SND_DSP_PROTO_{DSPMSG|DSPERR|HFABORT|RAW}.
 */


int DSPDisableHostMsg(void);
/* 
 * Disable DSP host message protocol.
 * All writes from the DSP come in on the "DSP message" port.
 * The "DSP errors" port will remain silent.
 * This corresponds to setting the DSP protocol int to 0 in
 * the DSP driver.  (cf. snddriver_dsp_protocol().)
 */


extern int DSPHostMsgIsEnabled(void);
/* 
 * Return state of HostMsg enable flag.
 */


extern int DSPMKIsWithSoundOut(void);
/* 
 * Returns nonzero if the DSP is linked to sound out.
 */


extern int DSPMKEnableSoundOut(void);
/* 
 * Enable DSP linkage to sound out.
 * When DSP is next opened, it will be linked to sound out.
 */


extern int DSPMKDisableSoundOut(void);
/* 
 * Disable DSP linkage to sound out.
 * When DSP is next opened, it will not be linked to sound out.
 */


extern int DSPMKSoundOutIsEnabled(void);
/* 
 * Return state of SoundOut enable flag.
 */


/* Sound out to the serial port */

extern int DSPMKEnableSSISoundOut(void);
/* 
 * Enable DSP serial port sound out.
 * When DSP is next opened with a Music Kit DSP system, it will be 
 * configured to have SSI sound out. 
 */


extern int DSPMKDisableSSISoundOut(void);
/* 
 * Disable DSP serial port sound out.
 * When DSP is next opened with a Music Kit DSP system, the SSI
 * port of the DSP will not be used.
 */


extern int DSPMKSSISoundOutIsEnabled(void);
/* 
 * Return state of serial port SoundOut enable flag.
 */


extern int DSPMKStartSSISoundOut(void);
/*
 * Tell DSP to send sound-out data to the SSI serial port in the DSP.
 * The DSP will block until the SSI port has read the current sound-out
 * buffer.  SSI sound-out to the SSI can not occur simultaneously with 
 * sound-out to the host.
 */


extern int DSPMKStopSSISoundOut(void);
/*
 * Tell DSP not to send sound-out data to the SSI serial port.
 */


/* Sound in from the serial port */

extern int DSPMKEnableSSIReadData(void);
/* 
 * Enable DSP serial port sound in.
 * When DSP is next opened with a Music Kit DSP system, it will be 
 * configured to have SSI sound in.
 */


extern int DSPMKDisableSSIReadData(void);
/* 
 * Disable DSP serial port sound in.
 * When DSP is next opened with a Music Kit DSP system, the SSI
 * port of the DSP will not be used.
 */


extern int DSPMKSSIReadDataIsEnabled(void);
/* 
 * Return state of serial port ReadData enable flag.
 */


extern int DSPMKStartSSIReadData(void);
/*
 * Tell DSP to read sound-in data from the SSI serial port in the DSP.
 * The DSP will block until the SSI port has written the current sound-in
 * buffer.  Sound-in from the SSI can occur simultaneously with SSI sound-out
 */


extern int DSPMKStopSSIReadData(void);
/*
 * Tell DSP not to take sound-in data from the SSI serial port.
 */


extern int DSPMKEnableSmallBuffers(void);
/* 
 * Enable use of small buffers for DSP sound-out.
 * This is something worth doing when real-time response
 * is desired.  Normally, the sound-out driver uses
 * four 8K byte buffers.  With small buffers enabled,
 * four 1K byte buffers are used.
 */


extern int DSPMKDisableSmallBuffers(void);
/* 
 * Disable use of small buffers for DSP sound-out.
 */


extern int DSPMKSmallBuffersIsEnabled(void);
/* 
 * Return true if small sound-out buffers are enabled.
 */


extern int DSPMKEnableTMFlush(void);
/* 
 * Enable flushing timed messages every message.
 * This is for debugging so it is easy to see each message go by.
 * It also can be tried if a bug is suspected in the timed message
 * optimization.
 */


extern int DSPMKDisableTMFlush(void);
/* 
 * Disable auto-flushing timed messages.
 */


extern int DSPMKTMFlushIsEnabled(void);
/* 
 * Return true if auto-flushing timed messages is enabled.
 */

extern int DSPSetTimedZeroNoFlush(int yesOrNo);

extern int DSPMKEnableBlockingOnTMQEmptyTimed(DSPFix48 *aTimeStampP);
/* 
 * Tell the DSP to block when the Timed Message Queue is empty.
 * This prevents the possibility of late score information.
 * It is necessary to call DSPMKDisableBlockingOnTMQEmptyTimed()
 * after the last time message is sent to the DSP to enable the 
 * computing of all sound after the time of the last message.
 */


extern int DSPMKDisableBlockingOnTMQEmptyTimed(DSPFix48 *aTimeStampP);
/* 
 * Tell the DSP to NOT block when the Timed Message Queue is empty.
 */

/****************** Getting and setting DSP system files *********************/

/*
 * Get/set various DSP system file names.
 * The default filenames are defined in dsp.h.
 * The "get" versions return an absolute path.
 * The "set" versions take a relative path.
 * The environment variable $DSP must be overwritten appropriately
 * before a "get" version will return what the "set" version set.
 * Or, one could place custom system files in the $DSP directory.
 */


/* Misc. routines for getting various directories. */
const char *DSPGetDSPDirectory(void);    /* DSP_SYSTEM_DIRECTORY or $DSP if set */
char *DSPGetSystemDirectory(void); /* <DSPDirectory>/monitor */
char *DSPGetAPDirectory(void);     /* <DSPDirectory>/DSP_AP_BIN_DIRECTORY */

extern int DSPSetSystem(DSPLoadSpec *system);
/* 
 * Set the DSP system image (called by DSPBoot.c) 
 * If the system name begins with "MKMON" or "APMON",
 * all system filenames (binary, link, and map) are set accordingly.
 */


char *DSPGetSystemBinaryFile(void);
/* 
 * Get system binary filename.
 * Used by DSPBoot.c.
 */


char *DSPGetSystemLinkFile(void);
/* 
 * Get system linkfile name.
 * Used by _DSPMakeMusicIncludeFiles.c.
 */


char *DSPGetSystemMapFile(void);
/* 
 * Get system linkfile name.
 * Used by _DSPRelocateUser.c.
 */


extern int DSPMonitorIsMK(void);
/*
 * Returns true if the currently set DSP system is of the
 * for "mkmon*.dsp", otherwise false.
 */


extern int DSPSetMKSystemFiles(void);
/*
 * Set the system binary, link, and map files to the MK world.
 */


extern int DSPMonitorIsAP(void);
/*
 * Returns true if the currently set DSP system is of the
 * form "apmon*.dsp", otherwise false.
 */


extern int DSPSetAPSystemFiles(void);
/*
 * Set the system binary, link, and map files to the AP world.
 */


/***************************** WriteData Setup *******************************/

/*
 * "Write data" is DSP sound data which is being recorded to disk.
 */


extern int DSPMKSetWriteDataFile(const char *fn);
/* 
 * Set the file-name for DSP write-data to fn.
 */


char *DSPMKGetWriteDataFile(void);
/* 
 * Read the file-name being used for DSP write-data.
 */


extern int DSPMKEnableWriteData(void);
/* 
 * Enable DSP write data.
 * When DSP is next opened, stream ports will be set up between the
 * DSP, host, and sound-out such that write-data can be used.
 * 
 * After opening the DSP with DSPMKInit(), call DSPMKStartWriteDataTimed() 
 * (described below) to spawn the thread which reads DSP data to disk.
 *
 *  Bug: Audible sound-out is disabled during write data.
 */


extern int DSPMKDisableWriteData(void);
/* 
 * Disable DSP write data (default).
 */


extern int DSPMKWriteDataIsEnabled(void);
/* 
 * Return state of DSP write-data enable flag.
 */


extern int DSPMKWriteDataIsRunning(void);
/* 
 * Return nonzero if DSP write data thread is still running.
 */


/* 
 * The write-data time-out is the number of milliseconds to wait in 
 * msg_receive() for a write-data sound buffer from the DSP.
 * On time-out, it is assumed that the DSP is not sending any more
 * write-data, and the thread reading write data terminates.
 */


extern int DSPMKGetWriteDataTimeOut(void);
/* 
 * Get number of milliseconds to wait in msg_receive() for a sound buffer
 * from the DSP before giving up.
 */


extern int DSPMKSetWriteDataTimeOut(int to);
/* 
 * Set number of milliseconds to wait in msg_receive() for a sound buffer
 * from the DSP before giving up.  The default is 60 seconds.  It must be
 * made larger if the DSP program might take longer than this to compute
 * a single buffer of data, and it can be set shorter to enable faster
 * detection of a hung DSP program.
 */


typedef void (*DSPMKWriteDataUserFunc)
    (short *data,unsigned int dataCount,int dspNum);

extern int DSPMKSetUserWriteDataFunc(DSPMKWriteDataUserFunc userFunc);
/* Set user function to be called on each write data buffer.  Args to userFunc
   are the data buffer, the number of words in that buffer, the actual 
   vm size of that buffer (for vm_deallocate), and the dsp number.
   The caller should not deallocate the buffer, that's done automatically
   immediately following the call to the user func.  The user func is
   called in the write data thread.  If the data is to be passed to the
   Music Kit or application thread, it may be passed as out-of-line data
   in a Mach message.  In this case, the receiving thread *should* call
   vm_deallocate(), using vmCount as the size.
*/

extern int DSPMKSoundOutDMASize(void);
/*
 * Returns the size of single DMA transfer used for DSP sound-out
 * 16-bit words.  This may change at run time depending on whether
 * read-data is used or if a smaller buffer size is requested.
 */


extern int DSPMKClearDSPSoundOutBufferTimed(DSPTimeStamp *aTimeStamp);
/*
 * Clears the DSP's sound-out buffer.  Normally, this is unnecessary
 * because the DSP orchestra puts out zeros by default.
 */

/***************************** ReadData Setup *******************************/

/*
 * "Read data" is DSP sound data (stereo or mono) which is being read from 
 * disk and sent to a Music Kit Orchestra running on the DSP.
 */


extern int DSPMKEnableReadData(void);
/* 
 * Enable DSP read data.
 * When the DSP is next opened, a read-data stream to the DSP will be opened.
 */


extern int DSPMKDisableReadData(void);
/* 
 * Disable DSP read data (default).
 */


extern int DSPMKReadDataIsEnabled(void);
/* 
 * Return state of DSP read-data enable flag.
 */


extern int DSPMKSetReadDataFile(const char *fn);
/* 
 * Set the read-data file-name to fn.
 */


/*********************** OPENING AND CLOSING THE DSP ***********************/

extern int DSPOpenNoBootHighPriority(void);
/*
 * Open the DSP at highest priority.
 * This will normally only be called by a debugger trying to obtain
 * ownership of the DSP when another task has ownership already.
 */ 


extern int DSPOpenNoBoot(void);
/*
 * Open the DSP in the state implied by the DSP state variables.
 * If the open is successful or DSP is already open, 0 is returned.
 * After DSPOpenNoBoot, the DSP is open in the reset state awaiting
 * a bootstrap program download.  Normally, only DSPBoot or a debugger
 * will ever call this routine.  More typically, DSPInit() is called 
 * to open and reboot the DSP.
 */


extern int DSPIsOpen(void);
/* 
 * Returns nonzero if the DSP is open.
 */


DSPLoadSpec *DSPGetSystemImage(void);
/* 
 * Get pointer to struct containing DSP load image installed by DSPBoot().
 * If no system has been loaded, NULL is returned.
 */


extern int DSPClose(void);
/*
 * Close the DSP device (if open). If sound-out DMA is in progress, 
 * it is first turned off which leaves the DSP in a better state.
 * Similarly, SSI sound-out from the DSP, if running, is halted.
 */


extern int DSPCloseSaveState(void);
/*
 * Same as DSPClose(), but retains all enabled features such that
 * a subsequent DSPBoot() or DSPOpenNoBoot() will come up in the same mode.
 * If sound-out DMA is in progress, it is first turned off.
 * If SSI sound-out is running, it is halted.
 */


extern int DSPRawCloseSaveState(void);
/*
 * Close the DSP device without trying to clean up things in the DSP,
 * and without clearing the open state (so that a subsequent open
 * will be with the same modes).
 * This function is normally only called by DSPCloseSaveState, but it is nice
 * to have interactively from gdb when the DSP is wedged.
 */


extern int DSPRawClose(void);
/*
 * Close the DSP device without trying to clean up things in the DSP.
 * This function is normally only called by DSPClose, but it is nice
 * to have interactively from gdb when the DSP is known to be hosed.
 */


extern int DSPOpenWhoFile(void);
/*
 * Open DSP "who file" (unless already open) and log PID and time of open.
 * This file is read to find out who has the DSP when an attempt to
 * access the DSP fails because another task has ownership of the DSP
 * device port.  The file is removed by DSPClose().  If a task is
 * killed before it can delete the who file, nothing bad will happen.
 * It will simply be overwritten by the next open.
 */


extern int DSPCloseWhoFile(void);
/*
 * Close and delete the DSP lock file.
 */


char *DSPGetOwnerString(void);
/*
 * Return string containing information about the current task owning
 * the DSP.  An example of the returned string is as follows:
 * 
 *      DSP opened in PID 351 by me on Sun Jun 18 17:50:46 1989
 *
 * The string is obtained from the file /tmp/dsp_lock and was written
 * when the DSP was initialized.  If the DSP is not in use, or if there
 * was a problem reading the lock file, NULL is returned.
 * The owner string is returned without a newline.
 */


extern int DSPReset(void);
/* 
 * Reset the DSP.
 * The DSP must be open.
 * On return, the DSP should be awaiting a 512-word bootstrap program.
 */


/************************ Opening the DSP in special modes **************************/

#define DSP_8K  (0x1bff)  /* 7k-1  */
#define DSP_16K  (0x3bff)  /* 15k-1  */
#define DSP_32K (0x7bff)  /* 31k-1 */
#define DSP_64K (0xfbff)  /* 63k-1 */

#if m68k  /* We currently only support memory sensing on NeXT hardware */
extern int DSPSenseMem(int *memCount);
    /* Returns 0 for success, 1 otherwise.
     * If successful, *memCount is DSP_8K, DSP_32K or DSP_64K (or 64k x 3 = 192K)
     */
#endif


/* 
 * These are equivalent to some combination of DSPEnable*() and/or DSPDisable*()
 * function calls followed by DSPOpen().
 */

extern int DSPMKInit(void);
/* NOTE: The Music Kit currently uses its own version of this function
 *       so that it can check the "app wrapper" for a version of the monitor.
 *
 * Open and reset the DSP such that it is ready to receive a user 
 * orchestra program.  It is the same as DSPBoot(musicKitSystem)
 * followed by starting up sound-out or write-data, if enabled.
 * Also differs from DSPInit() in that "Host Message" protocol is enabled.
 * This protocol implies that DSP messages (any word sent by the DSP
 * to the host outside of a data transfer is a DSP message) with the
 * high-order bit on are error messages, and they are routed to an
 * error port separate from the DSP message port.  Only the Music Kit
 * currently uses this protocol.
 */


extern int DSPMKInitWithSoundOut(int lowSamplingRate);
/* 
 * Open and reset the DSP such that it is ready to receive a user 
 * orchestra program.  Also set up link from DSP to sound-out.
 * If lowSamplingRate is TRUE, the sound-output sampling rate is set
 * to 22KHz, otherwise it is set to 44KHz.
 */


/****************************** SoundOut Handling ****************************/

extern int DSPMKStartSoundOut(void);
/*
 * Tell the DSP to begin sending sound-out packets which were linked
 * to the sound-out hardware by calling DSPMKEnableSoundOut().
 * The DSP must have been initialized via DSPMKInit() already.
 */


extern int DSPMKStopSoundOut(void);
/*
 * Tell DSP to stop sending sound-out packets.
 */


/***************************** WriteData Handling ****************************/

extern int DSPMKStartWriteDataTimed(DSPTimeStamp *aTimeStampP);
/*
 * Tell the DSP to start sending sound-out requests to the DSP driver when a
 * buffer of sound-out data is ready in the DSP.  A thread is spawned which
 * blocks in msg_receive() until each record region is received, and the
 * buffers are written to disk in the file established by
 * DSPMKSetWriteDataFile().  A second effect of this function is that the 
 * DSP will now block until the driver reads each sound-out buffer.
 * This function must be called after the DSP is initialized by DSPMKInit().
 *
 * If sound-out is also requested (via DSPMKEnableSoundOut()), each buffer
 * will be played immediately after it is written to disk.  In this case,
 * there is no need to also call DSPMKStartSoundOut().
 *
 * Bug: Audible sound-out is disabled during write data.
 * Since this should be fixed in the future, do not call both 
 * DSPMKEnableSoundOut() and DSPMKEnableWriteData() if you want
 * the same behavior in future releases.
 */


extern int DSPMKStartWriteData(void);
/*
 * Equivalent to DSPMKStartWriteDataTimed(DSPMK_UNTIMED);
 */


extern int DSPMKGetWriteDataSampleCount(void);
/* 
 * Get number of samples written to disk since write-data was initialized.
 */


extern int DSPMKStopWriteDataTimed(DSPTimeStamp *aTimeStampP);
/*
 * Tell DSP not to generate write-data requests.
 * If write-data is going to disk, it does NOT tell the write-data thread
 * to exit.  This must be the case since only the DSP knows when to turn
 * off write-data. Call DSPMKStopWriteData() to halt the write-data thread,
 * or let it time-out and abort on its own, (cf. DSPMKSetWriteDataTimeOut()).
 * Note that as far as the DSP is concerned, there is no difference between
 * write-data and sound-out.  Thus, calling this function will also turn off
 * sound-out, if it was enabled, whether or not write data was specifically
 * enabled.  A byproduct of this function is that the DSP stops blocking 
 * until each sound-out buffer is read by the driver. The timed start/stop
 * write-data functions can be used to write out specific sections of
 * a Music Kit performance, running as fast as possible (silently, throwing
 * away sound output buffers) during intervals between the stop and start
 * times.
 */


extern int DSPMKStopWriteData(void);
/*
 * Same as DSPMKStopWriteDataTimed(aTimeStampP) but using an untimed
 * host message to the DSP.  Called by DSPMKStopSoundOut().
 * If write-data is going to disk, also tells write-data thread
 * to exit.  See DSPMKStopWriteDataTimed() above.
 */


extern int DSPMKRewindWriteData(void);
/*
 * Rewind write-data to beginning of file.
 * DSPMKStopWriteData() must have been called first to terminate
 * the thread which actively writes the file.
 * After this, write-data can be resumed by DSPMKStartWriteData{Timed}().
 */

extern int DSPMKCloseWriteDataFile(void);
/*
 * Close the write-data file.
 * DSPMKStopWriteData() is called automatically if write-data is running.
 * This function is called by DSPClose(), so it is normally not used
 * unless the file is needed as an input before the DSP is next closed and
 * reopened.
 */

/***************************** ReadData Handling ****************************/

extern int DSPMKStartReadDataTimed(DSPTimeStamp *aTimeStampP);
/*
 * Start read-data flowing from disk to the DSP.
 * This function must be called after the DSP is initialized by DSPMKInit()
 * with read-data enabled by DSPMKEnableReadData(), and with
 * the input disk file having been specified by DSPMKSetReadDataFile().
 * The first two buffers of read-data are sent to the DSP immediately,
 * and a timed message is sent to the DSP saying when to start consumption.
 * A thread is spawned which blocks in msg_send() until each buffer is taken.
 * The DSP will request buffer refills from the driver as needed.
 * There is no timeout as there is for write data because the thread knows 
 * how much data to expect from the file, and it waits forever trying to give 
 * buffers to the DSP.  
 *
 * A second effect of this function is that the DSP orchestra program will 
 * begin blocking on read-data underrun.  There are two read-data buffers in 
 * the DSP, so blocking tends not happen if the host is able to convey sound 
 * from the disk to the DSP in real time or better, on average.
 *
 * If aTimeStamp == DSPMK_UNTIMED, the read-data is started in the PAUSED
 * state.  A subsequent DSPMKResumeReadDataTimed() is necessary to tell the
 * DSP when to begin consuming the read data.  The time-stamp can be set to 
 * contain zero which means start read data immediately in the DSP.
 *
 * Note that DSPMKStartReadDataTimed(ts) is equivalent to
 * DSPMKStartReadDataPaused() followed by DSPMKResumeReadDataTimed(ts).
 */


extern int DSPMKStartReadDataPaused(void);
/*
 * Equivalent to DSPMKStartReadDataTimed(DSPMK_UNTIMED);
 */


extern int DSPMKStartReadData(void);
/*
 * Equivalent to DSPMKStartReadDataTimed(&DSPMKTimeStamp0);
 * Read-data starts in the DSP immediately.
 */


extern int DSPMKGetReadDataSampleCount(void);
/* 
 * Get number of samples sent to the DSP since read-data was started.
 */


extern int DSPMKPauseReadDataTimed(DSPTimeStamp *aTimeStampP); 
/* 
 * Tell the DSP to stop requesting read-data buffer refills at the
 * specified time.  When this happens, the read-data stream going from
 * disk to the DSP will block.
 * 
 * This function and its "resume" counterpart provide
 * a way to save disk space in the read-data file when there are stretches
 * of time in the Music Kit performance during which no read-data is needed.
 * Silence in the read-data file can be squeezed out, and the pause/resume
 * functions can be used to read in the sound sections only when needed.
 */


extern int DSPMKResumeReadDataTimed(DSPTimeStamp *aTimeStampP);
/* 
 * Tell the DSP to resume read-data at the specified time.
 */


extern int DSPMKReadDataIsRunning(void);
/* 
 * Return nonzero if DSP read data thread is still running.
 * "Paused" is considered a special case of "running" since the
 * thread which spools data to the DSP is still alive.
 */


extern int DSPMKStopReadData(void);
/*
 * Tell DSP to stop read-data consumption, if active, and tell the host
 * read-data thread to exit.  See also DSPMKPauseReadDataTimed() above.
 */


extern int DSPMKRewindReadData(void);
/*
 * Rewind read-data to beginning of file.
 * The read-data thread should be paused or stopped during this operation.
 */


extern int DSPMKSetReadDataBytePointer(int offset);
/*
 * Move read-data file pointer to given offset in bytes.
 * Returns file pointer in bytes from beginning of file after the seek
 * or -1 if an error occurs.
 * The read-data thread should be paused or stopped during this operation.
 */

extern int DSPMKIncrementReadDataBytePointer(int offset);
/*
 * Move read-data file pointer to given offset from current location in bytes.
 * Returns file pointer in bytes from beginning of file after the seek
 * or -1 if an error occurs.
 * The read-data thread should be paused or stopped during this operation.
 */


/******************************* User aborted function ***********************/

extern void DSPSetUserAbortedFunction(char (*abortFunc)(void));

/******************************* DSP Negotiation Port ************************/

int DSPSetNegotiationPort(mach_port_t neg_port);
/* 
 * Set port given to anyone attempting to open the DSP.
 */

mach_port_t DSPGetNegotiationPort(void);
/* 
 * Get port set by DSPSetNegotiationPort().
 */

/******************************* Port fetching *******************************/

/*
 * In all these routines for obtaining Mach ports,
 * the DSP must be opened before asking for the ports.
 */

mach_port_t DSPGetOwnerPort(void);
/* 
 * Get port conveying DSP and sound-out ownership capability.
 */


mach_port_t DSPGetHostMessagePort(void);
/* 
 * Get port used to send "host messages" to the DSP.
 * Also called the "command port" in other contexts.
 */


mach_port_t DSPGetDSPMessagePort(void);
/* 
 * Get port used to send "DSP messages" from the DSP to the host.
 * Messages on this port are enabled by DSPEnableHostMsg().
 */


mach_port_t DSPGetErrorPort(void);
/* 
 * Get port used to send "DSP error messages" from the DSP to the host.
 * Error messages on this port are enabled by DSPEnableHostMsg().
 */


mach_port_t DSPGetSoundPort(void);
/* 
 * Get sound device port.
 */


mach_port_t DSPMKGetWriteDataStreamPort(void);
/* 
 * Get stream port used to receive "DSP write data" buffers from the DSP.
 */


mach_port_t DSPMKGetSoundOutStreamPort(void);
/* 
 * Get stream port used to convey "sound out" buffers from the DSP
 * to the stereo DAC.
 */

mach_port_t DSPMKGetWriteDataReplyPort(void);
/* 
 * Get reply port used to receive status information on "DSP write data" 
 * buffers transfers from the DSP.
 */

/************************ SIMULATOR FILE MANAGEMENT **************************/

extern int DSPIsSimulated(void);
/* 
 * Returns nonzero if the DSP is simulated.
 */


extern int DSPIsSimulatedOnly(void);
/* 
 * Returns nonzero if the DSP simulator output is open but the DSP device 
 * is not open.  This would happen if DSPOpenSimulatorFile() were called
 * without opening the DSP.
 */


FILE *DSPGetSimulatorFP(void);
/*
 * Returns file pointer used for the simulator output file, if any.
 */


extern int DSPOpenSimulatorFile(char *fn);                      
/* 
 * Open simulator output file fn.
 */


extern int DSPStartSimulator(void);
/*
 * Initiate simulation mode, copying DSP commumications to the simulator
 * file pointer.
 */


extern int DSPStartSimulatorFP(FILE *fp);
/*
 * Initiate simulation mode, copying DSP commumications to the file pointer fp.
 * If fp is NULL, the previously set fp, if any, will be used.
 */


extern int DSPStopSimulator(void);
/*
 * Clear simulation bit, halting DSP command output to the simulator file.
 */


extern int DSPCloseSimulatorFile(void);
/* 
 * Close simulator output file.
 */

/*********************** DSP COMMANDS FILE MANAGEMENT ************************/

extern int DSPIsSavingCommands(void);
/* 
 * Returns nonzero if a "DSP commands file" is open.
 */

extern int DSPIsSavingCommandsOnly(void);
/* 
 * Returns nonzero if the DSP commands file is open but the DSP device 
 * is not open.  This would happen if DSPOpenCommandsFile() were called
 * without opening the DSP.
 */

extern int DSPOpenCommandsFile(const char *fn);
/*
 * Opens a "DSP Commands file" which will receive all Mach messages
 * to the DSP.  The filename suffix should be ".snd".  This pseudo-
 * sound file can be played by the sound library.
 */

extern int DSPCloseCommandsFile(DSPFix48 *endTimeStamp);
/*
 * Closes a "DSP Commands file".  The endTimeStamp is used by the
 * sound library to terminate the DSP-sound playback thread.
 */

extern int DSPBailingOut(int dspNum);
/* Returns non-zero if the DSP library aborted for the current DSP because 
 * of a seemingly dead DSP */


/******************************* DSP Driver Protocol *******************************/

int DSPGetProtocol(void);
/*
 * Returns the DSP protocol int in effect.  Some of the relevant bits are
 *
 *   SNDDRIVER_DSP_PROTO_RAW     - disable all DSP interrupts
 *   SNDDRIVER_DSP_PROTO_DSPMSG  - enable DSP messages (via intrpt)
 *   SNDDRIVER_DSP_PROTO_DSPERR  - enable DSP error messages (hi bit on)
 *   SNDDRIVER_DSP_PROTO_C_DMA   - enable "complex DMA mode"
 *   SNDDRIVER_DSP_PROTO_HFABORT - recognize HF2&HF3 as "DSP aborted"
 *
 * See the snddriver function documentation for more information (e.g.
 * snddriver_dsp_protocol()).
 */

int DSPSetProtocol(int newProto);
/*
 * Sets the protocol used by the DSP driver.
 * This function logically calls snddriver_dsp_proto(), but it's faster
 * inside libdsp optimization blocks.  (As many Mach messages as possible are 
 * combined into a single message to maximize performance.)
 */

extern int DSPSetComplexDMAModeBit(int bit);
/*
 * Set or clear the bit "SNDDRIVER_DSP_PROTO_C_DMA" in the DSP driver protocol.
 * For DMA transfers carried out by libdsp, this protocol bit is automatically
 * set before and cleared after the transfer.  If you use 
 * snddriver_dsp_dma_{read,write}() to carry out DMA transfers between the
 * DSP and main memory, you must set the C_DMA protocol bit yourself.
 */

extern int DSPSetHostMessageMode(void);
/*
 * Set "Host Message" protocol.  This is the dynamic version of DSPEnableHostMsg()
 * followed by a form of DSPOpen().  It can be called after the DSP is already open.
 * Host message mode consists of the driver protocol flags 
 * SNDDRIVER_DSP_PROTO_{DSPMSG|DSPERR} in addition to the flags enabled by libdsp
 * when not in host message mode, which are SNDDRIVER_DSP_PROTO_{RAW|HFABORT}.
 */

extern int DSPClearHostMessageMode(void);
/*
 * Clear "Host Message" protocol.  This is the dynamic version of DSPDisableHostMsg()
 * followed by a form of DSPOpen().  It can be called after the DSP is already open.
 * Clearing host message mode means clearing the driver protocol flags 
 * SNDDRIVER_DSP_PROTO_{DSPMSG|DSPERR}.  The usual protocol bits
 * SNDDRIVER_DSP_PROTO_{RAW|HFABORT} are left on.  
 * 
 * Note that the "complex DMA mode bit " bit is not touched.  
 * If you have enabled the SNDDRIVER_DSP_PROTO_C_DMA protocol bit,
 * clearing host message mode will probably not do what you want (prevent the driver
 * from taking DSP interrupts and filling the message buffer with whatever the
 * DSP has to send).  In general, the driver is taking DSP interrupts whenever
 * SNDDRIVER_DSP_PROTO_RAW is off and when any of
 * SNDDRIVER_DSP_PROTO_{DSPMSG|DSPERR|C_DMA} are set.  
 * 
 * When the "RAW" mode bit is off, you can think of it as "release 1.0 mode", 
 * where you get DSPERR mode by default, even with no other protocol bits enabled.
 * Consult the snddriver function documentation for more details
 * of this complicated protocol business.  Yes, there's actually documentation.
 * ("Inside every mode, there is a simpler mode struggling to get out.")
 */

/******************************  DSP Symbols *********************************/

/*
 * DSP symbols are produced by asm56000, the DSP56000/1 assembler.
 * They are written into either a .lnk or .lod file, depending on 
 * whether the assembly was "relative" or "absolute", respectively.
 * When DSPReadFile() reads one of these files (ASCII), or their .dsp file
 * counterparts (binary), all symbols are loaded as well into the
 * structs described in /usr/include/dsp/dsp_structs.h.  The functions
 * below support finding these symbols and their values.  Because the
 * assembler does not fully support mixed case, all symbol names are 
 * converted to upper case when read in, and any name to be searched for
 * in the symbol table is converted to upper case before the search.
 */


extern int DSPSymbolIsFloat(DSPSymbol *sym);
/* 
 * Returns TRUE if the DSP assembler symbol is type 'F'.
 */


extern DSPSymbol *DSPGetSectionSymbol(char *name, DSPSection *sec);
/*
 * Find symbol within the given DSPSection with the given name. 
 * See "/LocalDeveloper/Headers/dsp/dsp_structs.h" for the definition of a 
 * DSPSection. Equivalent to trying DSPGetSectionSymbolInLC() for each of 
 * the 12 DSP location counters.
 */


extern DSPSymbol *DSPGetSectionSymbolInLC(char *name, DSPSection *sec, 
                                   DSPLocationCounter lc);
/*
 * Find symbol within the given DSPSection and location counter
 * with the given name.  See "/LocalDeveloper/Headers/dsp/dsp_structs.h" 
 * for an lc list.
 */


extern int DSPReadSectionSymbolAddress(DSPMemorySpace *spacep,
                                       DSPAddress *addressp,
                                       char *name,
                                       DSPSection *sec);
/*
 * Returns the space and address of symbol with the given name in the 
 * given DSP section.  Note that there is no "Get" version because
 * both space and address need to be returned.
 */

extern int DSPGetSystemSymbolValue(char *name);
/*
 * Returns the value of the symbol "name" in the DSP system image, or -1 if
 * the symbol is not found or the DSP is not opened.  
 *
 * The "system image" is that of the currently loaded monitor in the currently
 * selected DSP.  The current DSP must be open so for this monitor image to
 * be available.
 * 
 * The requested symbol
 * is assumed to be type "I" and residing in the GLOBAL section under location
 * counter "DSP_LC_N" (i.e., no memory space is associated with the symbol).
 * No fixups are performed, i.e., the symbol is assumed to belong to an 
 * absolute (non-relocatable) section.  
 * See /usr/local/lib/dsp/monitor/apmon_8k.lod and mkmon_A_8k.lod for example 
 * system files which compatibly define system symbols.
 *
 * Equivalent to
 *  DSPGetSectionSymbol(name,DSPGetUserSection(DSPGetSystemImage()));
 * (because the DSP system is assembled in absolute mode, and there
 * is only one section, the global section, for absolute assemblies).
 */

extern int DSPGetSystemSymbolValueInLC(char *name, DSPLocationCounter lc);
/*
 * Same as DSPGetSystemSymbolValue() except faster because the location 
 * counter is known, and the rest are not searched.
 */

int DSPReadSystemSymbolAddress(DSPMemorySpace *spacep, DSPAddress *addressp,
                               char *name);
/*
 * Same as DSPReadSectionSymbolAddress() except it knows to look in the
 * system section (GLOBAL).
 */

#endif

---