/*	----------------------------------------------------------------------------
	LAYLA.h

	PURPOSE:  Handles the LAYLA sound box via the ASIO interface.  

    WAVEtoCHN
	WAVECHN_TBL

    The structures above are key to operation of the LAYLA hardware via the
	ASIO sound driver.  These structures contain where to get new waveforms
	for D/A channels and how many segments are contained in each measured waveform.

    These tables also contain access control bits allowing the sound driver thread
	to coordinate with the CIN.  The access bits mean that a given sound buffer
	is not being logically accessed at the same time.

    There is one WAVECHN_TBL table for all A/D channels and one for all D/A channels.
*/


#ifndef _LAYLA_
#define _LAYLA_

#include <string.h>		// Need NULL definition

#include "misctyps.h"
#include "CHANNEL.hpp"


//	----------------------------- Data types
	#define		LAYLA_CHNS	   8			// Number of input & output channels

//	#define		SAMPLE_RATE	96000L					// Sample rate in Hz
	#define		SAMPLE_RATE	65536L					// Sample rate in Hz
	#define     WIDTH		32						// Sound buffer width in bits
	#define		BYTES		( WIDTH / 8 )			// Sound buffer width in bytes
	#define		NUM_SAMPLES	( FAST_FFT_SZ )			// Number of samples in a sound buffer
	#define		BUF_SIZE	( g_lBufSZ * BYTES )	// Sound buffer length in bytes

	#define		ASIO_RUNFAULT	( 0x0001 )
	#define		ASIO_LINKED		( 0x0004 )
	#define		ASIO_OPENED		( 0x0008 )
	#define		ASIO_ACCESSED	( 0x0010 )
	#define		ASIO_SIZEFAULT	( 0x0020 )
	#define		ASIO_SAMPFAULT	( 0x0040 )
	#define		ASIO_BUFFAULT	( 0x0080 )


	typedef struct {

		CHANNEL		*pCH;					// Pointer to channel object
		int			 Chan;					// Channel number we are mapped to
		long		*pWV;					// Pointer to input/output waveform
		ulong		 LenWV;					// Length of the waveform
		int			 NumSeg;				// Number of sound buffers necessary to hold waveform
		int			 CurSeg;				// Waveform segment TO BE processed
		int			 Changed;				// Flag to indicate if the underlying waveform has changed
		int			 Accessed;				// Indicates if other side is accessing the waveform
		int			 NotPure;				// When 0 indicates that the wave is "pure" containing no transitions

	} WAVEtoCHN;

	typedef struct {

		int			ChCnt;					// Count of active channels in the table
		int			Changed;				// Flag to indicate if table has changed
		WAVEtoCHN	wvch[ LAYLA_CHNS+1 ];	// Wave to Channel mapping
		uint		Missed;					// Idicates if sound processing got behind (1 bit each active channel)

	} WAVECHN_TBL;


//	------------------------------ Function prototypes
	void	LAYLA_init	( void );						// Initializes LAYLA interface
	void	LAYLA_init2	( long SoundBufSize );			// Initializes LAYLA interface specifying sound buffer size
	int		LAYLA_go	( void );						// Instatiates ASIO driver, creates sound buffers, starts playing/recording
	int		LAYLA_ramp	( void );						// Same as go, but output sound buffers are ramped up
	int		LAYLA_stop	( void );						// Stops ASIO driver, releases sound resources

	int		LAYLA_map	( CHANNEL *pCH );				// Makes an entry in the WAVE to CHANNEL mapping table
	int		LAYLA_update( int TblIdx ,CHANNEL *pCH );	// Updates a table entry


//	------------------------------ Master Wave to Channel mapping, extern if you are not Layla implementation
	#ifdef _LAYLA_IMPLEMENTATION_

	WAVECHN_TBL	_wvchIN;					// Wave to Channel mapping table;  input channels
	WAVECHN_TBL	_wvchOUT;					// Wave to Channel mapping table;  output channels
	long		g_lBufSZ;
	uint		g_ErrNum;

	#else

	extern	WAVECHN_TBL	_wvchIN;			// Wave to Channel mapping table;  input channels
	extern	WAVECHN_TBL	_wvchOUT;			// Wave to Channel mapping table;  output channels
	extern	long		g_lBufSZ;			// Sound buffer size
	extern	uint		g_ErrNum;			// Error bits

	#endif



#endif