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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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.
*
* $URL$
* $Id$
*
*/
#include <common/scummsys.h>
#include "engines/engine.h"
#include "sound/mixer.h"
#include "dc.h"
EXTERN_C void *memcpy4s(void *s1, const void *s2, unsigned int n);
void initSound()
{
stop_sound();
do_sound_command(CMD_SET_FREQ_EXP(FREQ_22050_EXP));
do_sound_command(CMD_SET_STEREO(1));
do_sound_command(CMD_SET_BUFFER(SOUND_BUFFER_SHIFT));
}
void OSystem_Dreamcast::checkSound()
{
int n;
int curr_ring_buffer_samples;
if (!_mixer)
return;
if (read_sound_int(&SOUNDSTATUS->mode) != MODE_PLAY)
start_sound();
curr_ring_buffer_samples = read_sound_int(&SOUNDSTATUS->ring_length);
n = read_sound_int(&SOUNDSTATUS->samplepos);
if ((n-=fillpos)<0)
n += curr_ring_buffer_samples;
n = ADJUST_BUFFER_SIZE(n-10);
if (n<100)
return;
Audio::Mixer::mixCallback(_mixer, (byte*)temp_sound_buffer,
2*SAMPLES_TO_BYTES(n));
if (fillpos+n > curr_ring_buffer_samples) {
int r = curr_ring_buffer_samples - fillpos;
memcpy4s(RING_BUF+fillpos, temp_sound_buffer, SAMPLES_TO_BYTES(r));
fillpos = 0;
n -= r;
memcpy4s(RING_BUF, temp_sound_buffer+r, SAMPLES_TO_BYTES(n));
} else {
memcpy4s(RING_BUF+fillpos, temp_sound_buffer, SAMPLES_TO_BYTES(n));
}
if ((fillpos += n) >= curr_ring_buffer_samples)
fillpos = 0;
}
int OSystem_Dreamcast::getOutputSampleRate() const
{
return read_sound_int(&SOUNDSTATUS->freq);
}
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