// ****************************************************************************
//
//      CDarla24DspCommObject.cpp
//
//              Implementation file for Darla24 DSP interface class.
//
// ----------------------------------------------------------------------------
//
// This file is part of Echo Digital Audio's generic driver library.
// Copyright Echo Digital Audio Corporation (c) 1998 - 2005
// All rights reserved
// www.echoaudio.com
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// ****************************************************************************

#include "CEchoGals.h"
#include "CDarla24DspCommObject.h"

#include "Darla24DSP.c"


/****************************************************************************

        Magic constants for the Darla24 hardware

 ****************************************************************************/

#define GD24_96000              0x0
#define GD24_48000              0x1
#define GD24_44100              0x2
#define GD24_32000              0x3
#define GD24_22050              0x4
#define GD24_16000              0x5
#define GD24_11025              0x6
#define GD24_8000                       0x7
#define GD24_88200              0x8
#define GD24_EXT_SYNC   0x9




/****************************************************************************

        Construction and destruction

 ****************************************************************************/

//===========================================================================
//
// Constructor
//
//===========================================================================

CDarla24DspCommObject::CDarla24DspCommObject
(
        PDWORD          pdwRegBase,                             // Virtual ptr to DSP registers
        PCOsSupport     pOsSupport
) : CGdDspCommObject( pdwRegBase, pOsSupport )
{
        strcpy( m_szCardName, "Darla24" );
        m_pdwDspRegBase = pdwRegBase;           // Virtual addr DSP's register base
        
        m_wNumPipesOut = 8;
        m_wNumPipesIn = 2;
        m_wNumBussesOut = 8;
        m_wNumBussesIn = 2;
        m_wFirstDigitalBusOut = 8;
        m_wFirstDigitalBusIn = 2;
        
        m_fHasVmixer = FALSE;   

        m_wNumMidiOut = 0;                                      // # MIDI out channels
        m_wNumMidiIn = 0;                                               // # MIDI in  channels
        m_pDspCommPage->dwSampleRate = SWAP( (DWORD) 44100 );
                                                                                                // Need this in case we start with ESYNC
                                                                                                
        m_pwDspCodeToLoad = pwDarla24DSP;

        //
        // Since this card has no ASIC, mark it as loaded so everything works OK
        //
        m_bASICLoaded = TRUE;

}       // CDarla24DspCommObject::CDarla24DspCommObject( DWORD dwPhysRegBase )


//===========================================================================
//
// Destructor
//
//===========================================================================

CDarla24DspCommObject::~CDarla24DspCommObject()
{
}       // CDarla24DspCommObject::~CDarla24DspCommObject()




/****************************************************************************

        Hardware config

 ****************************************************************************/

//===========================================================================
//
// SetSampleRate
// 
// Set the audio sample rate for Darla24; this is fairly simple.  You
// just pick the right magic number.
//
//===========================================================================

DWORD CDarla24DspCommObject::SetSampleRate( DWORD dwNewSampleRate )
{
        BYTE    bClock;

        //
        // Pick the magic number
        //
        switch ( dwNewSampleRate )
        {
                case 96000 :
                        bClock = GD24_96000;
                        break;
                case 88200 :
                        bClock = GD24_88200;
                        break;
                case 48000 : 
                        bClock = GD24_48000;
                        break;
                case 44100 :
                        bClock = GD24_44100;
                        break;          
                case 32000 :
                        bClock = GD24_32000;
                        break;          
                case 22050 :
                        bClock = GD24_22050;
                        break;
                case 16000 : 
                        bClock = GD24_16000;
                        break;
                case 11025 :
                        bClock = GD24_11025;
                        break;
                case 8000 :
                        bClock = GD24_8000;
                        break;
                default :
                        ECHO_DEBUGPRINTF( ("CDarla24DspCommObject::SetSampleRate: Error, "
                                                                         "invalid sample rate 0x%lx\n", dwNewSampleRate) );
                        return 0xffffffff;
        }

        if ( !WaitForHandshake() )
                return 0xffffffff;

        //
        // Override the sample rate if this card is set to Echo sync.  
        // m_pDspCommPage->wInputClock is just being used as a parameter here;
        // the DSP ignores it.
        //      
        if ( ECHO_CLOCK_ESYNC == GetInputClock() )
                bClock = GD24_EXT_SYNC;

        m_pDspCommPage->dwSampleRate = SWAP( dwNewSampleRate );

        //
        // Write the audio state to the comm page
        //
        m_pDspCommPage->byGDClockState = bClock;

        // Send command to DSP
        ClearHandshake();
        SendVector( DSP_VC_SET_GD_AUDIO_STATE );

        ECHO_DEBUGPRINTF( ("CDarla24DspCommObject::SetSampleRate: 0x%lx "
                                                         "clock %d\n", dwNewSampleRate, bClock) );

        return GetSampleRate();
        
} // DWORD CDarla24DspCommObject::SetSampleRate( DWORD dwNewSampleRate )


//===========================================================================
//
// Set input clock
// 
// Darla24 supports internal and Esync clock.
//
//===========================================================================

ECHOSTATUS CDarla24DspCommObject::SetInputClock(WORD wClock)
{
        if (    (ECHO_CLOCK_INTERNAL != wClock) &&
                        (ECHO_CLOCK_ESYNC != wClock))
                return ECHOSTATUS_CLOCK_NOT_SUPPORTED;
                
        m_wInputClock = wClock;
        
        return SetSampleRate( GetSampleRate() );
        
}       // SetInputClock


// **** Darla24DspCommObject.cpp ****