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os5_sound.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2005 The ScummVM project
 * Copyright (C) 2002-2005 Chris Apers - PalmOS Backend
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/backends/PalmOS/Src/os5_sound.cpp,v 1.1.2.1 2005/10/18 02:11:14 sev Exp $
 *
 */

#include "be_os5.h"
#include "common/config-manager.h"

#ifdef PALMOS_68K
static void initRegs(void *addr) {
      asm (
            move.l      addr, a0
            move.l      a4, 0(a0)
            move.l      a5, 4(a0)
      );
}

static Err sndCallback(void* UserDataP, SndStreamRef stream, void* bufferP, UInt32 *bufferSizeP) {
      asm (
//          movem.l a4-a5, -(sp)
            move.l UserDataP, a0
            move.l 0(a0), a4
            move.l 4(a0), a5
      );

      SoundDataType *_sound = (SoundDataType *)UserDataP;
      ((OSystem::SoundProc)_sound->proc)(_sound->param, (byte *)bufferP, *bufferSizeP);

//    asm ( movem.l (sp)+, a4-a5 );
      return errNone;
}

#else

static SYSTEM_CALLBACK Err sndCallback(void* UserDataP, SndStreamRef stream, void* bufferP, UInt32 *bufferSizeP) {
      SoundDataType *_sound = (SoundDataType *)UserDataP;
      ((OSystem::SoundProc)_sound->proc)(_sound->param, (byte *)bufferP, *bufferSizeP);
      return errNone;
}
#endif


bool OSystem_PalmOS5::setSoundCallback(SoundProc proc, void *param) {
      Err e;
      Boolean success = false;

      if (!_sound.active) {
            _sound.proc = proc;
            _sound.param = param;
            _sound.active = true;         // always true when we call this function, false when sound is off
            _sound.handle = NULL;


            if (ConfMan.hasKey("output_rate"))
                  _samplesPerSec = ConfMan.getInt("output_rate");
            else
#ifdef PALMOS_ARM
                  _samplesPerSec = 22050; // default value
#else
                  _samplesPerSec = 8000;  // default value
#endif

            // try to create sound stream
            if (1 || OPTIONS_TST(kOptPalmSoundAPI)) {
#ifdef PALMOS_68K
                  initRegs(&_sound);
#endif
                  e = SndStreamCreateExtended(
                                    &_sound.handle,
                                    sndOutput,
                                    sndFormatPCM,
                                    _samplesPerSec,
#ifdef PALMOS_ARM
                                    sndInt16Little,
#else
                                    sndInt16Big,
#endif
                                    sndStereo,
                                    (SndStreamVariableBufferCallback)sndCallback,
                                    &_sound,
                                    8192
#ifdef PALMOS_68K
                                    ,false
#endif
                                    );

                  e = e ? e : SndStreamStart(_sound.handle);
                  e = e ? e : SndStreamSetVolume(_sound.handle, (32767L / 16) * gVars->palmVolume / 100);
                  success = (e == errNone);
            }
      }
      // if not true some scenes (indy3 256,...) may freeze (ESC to skip)
      return true;
}

void OSystem_PalmOS5::clearSoundCallback() {
      if (_sound.active) {
            if (1 || OPTIONS_TST(kOptPalmSoundAPI)) {
                  SndStreamStop(_sound.handle);
                  SndStreamDelete(_sound.handle);
            }
      }
      
      _sound.active = false;
      _sound.handle = NULL;
}

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