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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.
*
*/
#include "osystem.h"
#include "audio/mixer.h"
namespace _3DS {
static bool hasAudio = false;
static void audioThreadFunc(void *arg) {
Audio::MixerImpl *mixer = (Audio::MixerImpl *)arg;
OSystem_3DS *osys = (OSystem_3DS *)g_system;
int i;
const int channel = 0;
int bufferIndex = 0;
const int bufferCount = 3;
const int bufferSize = 80000; // Can't be too small, based on delayMillis duration
const int sampleRate = mixer->getOutputRate();
int sampleLen = 0;
uint32 lastTime = osys->getMillis(true);
uint32 time = lastTime;
ndspWaveBuf buffers[bufferCount];
for (i = 0; i < bufferCount; ++i) {
memset(&buffers[i], 0, sizeof(ndspWaveBuf));
buffers[i].data_vaddr = linearAlloc(bufferSize);
buffers[i].looping = false;
buffers[i].status = NDSP_WBUF_FREE;
}
ndspChnReset(channel);
ndspChnSetInterp(channel, NDSP_INTERP_LINEAR);
ndspChnSetRate(channel, sampleRate);
ndspChnSetFormat(channel, NDSP_FORMAT_STEREO_PCM16);
while (!osys->exiting) {
osys->delayMillis(100); // Note: Increasing the delay requires a bigger buffer
time = osys->getMillis(true);
sampleLen = (time - lastTime) * 22 * 4; // sampleRate / 1000 * channelCount * sizeof(int16);
lastTime = time;
if (!osys->sleeping && sampleLen > 0) {
bufferIndex++;
bufferIndex %= bufferCount;
ndspWaveBuf *buf = &buffers[bufferIndex];
buf->nsamples = mixer->mixCallback(buf->data_adpcm, sampleLen);
if (buf->nsamples > 0) {
DSP_FlushDataCache(buf->data_vaddr, bufferSize);
ndspChnWaveBufAdd(channel, buf);
}
}
}
for (i = 0; i < bufferCount; ++i)
linearFree(buffers[i].data_pcm8);
}
void OSystem_3DS::initAudio() {
_mixer = new Audio::MixerImpl(this, 22050);
hasAudio = R_SUCCEEDED(ndspInit());
_mixer->setReady(false);
if (hasAudio) {
s32 prio = 0;
svcGetThreadPriority(&prio, CUR_THREAD_HANDLE);
audioThread = threadCreate(&audioThreadFunc, _mixer, 32 * 1048, prio - 1, -2, false);
}
}
void OSystem_3DS::destroyAudio() {
if (hasAudio) {
threadJoin(audioThread, U64_MAX);
threadFree(audioThread);
ndspExit();
}
delete _mixer;
_mixer = 0;
}
Audio::Mixer *OSystem_3DS::getMixer() {
assert(_mixer);
return _mixer;
}
} // namespace _3DS
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