/
osystem-audio.cpp
107 lines (87 loc) · 2.84 KB
/
osystem-audio.cpp
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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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "backends/platform/3ds/osystem.h"
#include "audio/mixer.h"
namespace N3DS {
static bool hasAudio = false;
static void audioThreadFunc(void *arg) {
Audio::MixerImpl *mixer = (Audio::MixerImpl *)arg;
OSystem_3DS *osys = dynamic_cast<OSystem_3DS *>(g_system);
const int channel = 0;
int bufferIndex = 0;
const int bufferCount = 2;
const int sampleRate = mixer->getOutputRate();
const int bufferSamples = 1024;
const int bufferSize = bufferSamples * 4;
ndspWaveBuf buffers[bufferCount];
for (int 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) {
svcSleepThread(5000 * 1000); // Wake up the thread every 5 ms
if (osys->sleeping) {
continue;
}
ndspWaveBuf *buf = &buffers[bufferIndex];
if (buf->status == NDSP_WBUF_FREE || buf->status == NDSP_WBUF_DONE) {
buf->nsamples = mixer->mixCallback(buf->data_adpcm, bufferSize);
if (buf->nsamples > 0) {
DSP_FlushDataCache(buf->data_vaddr, bufferSize);
ndspChnWaveBufAdd(channel, buf);
}
bufferIndex++;
bufferIndex %= bufferCount;
}
}
for (int i = 0; i < bufferCount; ++i)
linearFree(buffers[i].data_pcm16);
}
void OSystem_3DS::initAudio() {
_mixer = new Audio::MixerImpl(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 N3DS