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76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <common/scummsys.h>
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#include "engines/engine.h"
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#include "audio/mixer_intern.h"
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#include "dc.h"
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EXTERN_C void *memcpy4s(void *s1, const void *s2, unsigned int n);
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uint OSystem_Dreamcast::initSound()
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{
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stop_sound();
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do_sound_command(CMD_SET_FREQ_EXP(FREQ_22050_EXP));
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do_sound_command(CMD_SET_STEREO(1));
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do_sound_command(CMD_SET_BUFFER(SOUND_BUFFER_SHIFT));
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return read_sound_int(&SOUNDSTATUS->freq);
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}
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void OSystem_Dreamcast::checkSound()
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{
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int n;
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int curr_ring_buffer_samples;
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if (!_mixer)
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return;
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if (read_sound_int(&SOUNDSTATUS->mode) != MODE_PLAY)
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start_sound();
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curr_ring_buffer_samples = read_sound_int(&SOUNDSTATUS->ring_length);
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n = read_sound_int(&SOUNDSTATUS->samplepos);
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if ((n-=fillpos)<0)
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n += curr_ring_buffer_samples;
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n = ADJUST_BUFFER_SIZE(n-10);
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if (n<100)
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return;
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_mixer->mixCallback((byte *)temp_sound_buffer,
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2*SAMPLES_TO_BYTES(n));
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if (fillpos+n > curr_ring_buffer_samples) {
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int r = curr_ring_buffer_samples - fillpos;
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memcpy4s(RING_BUF+fillpos, temp_sound_buffer, SAMPLES_TO_BYTES(r));
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fillpos = 0;
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n -= r;
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memcpy4s(RING_BUF, temp_sound_buffer+r, SAMPLES_TO_BYTES(n));
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} else {
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memcpy4s(RING_BUF+fillpos, temp_sound_buffer, SAMPLES_TO_BYTES(n));
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}
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if ((fillpos += n) >= curr_ring_buffer_samples)
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fillpos = 0;
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}
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