108 lines
3 KiB
C++
108 lines
3 KiB
C++
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/* 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "osystem.h"
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static bool exitAudioThread = false;
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static bool hasAudio = false;
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static void audioThreadFunc(void* arg) {
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Audio::MixerImpl *mixer = (Audio::MixerImpl *) arg;
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OSystem_3DS *osys = (OSystem_3DS*)g_system;
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int i;
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const int channel = 0;
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int bufferIndex = 0;
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const int bufferCount = 3;
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const int bufferSize = 80000; // Can't be too small, based on delayMillis duration
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const int sampleRate = 22050;
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int sampleLen = 0;
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uint32 lastTime = osys->getMillis(true);
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uint32 time = lastTime;
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ndspWaveBuf buffers[bufferCount];
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for(i = 0; i < bufferCount; ++i) {
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memset(&buffers[i], 0, sizeof(ndspWaveBuf));
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buffers[i].data_vaddr = linearAlloc(bufferSize);
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buffers[i].looping = false;
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buffers[i].status = NDSP_WBUF_FREE;
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}
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ndspChnReset(channel);
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ndspChnSetInterp(channel, NDSP_INTERP_LINEAR);
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ndspChnSetRate(channel, sampleRate);
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ndspChnSetFormat(channel, NDSP_FORMAT_STEREO_PCM16);
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while(!exitAudioThread) {
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bufferIndex++;
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bufferIndex %= bufferCount;
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ndspWaveBuf* buf = &buffers[bufferIndex];
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osys->delayMillis(100); // Note: Increasing the delay requires a bigger buffer
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time = osys->getMillis(true);
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sampleLen = (time - lastTime) * 22 * 4; // sampleRate / 1000 * channelCount * sizeof(int16);
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lastTime = time;
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if (sampleLen > 0) {
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buf->nsamples = mixer->mixCallback(buf->data_adpcm, sampleLen);
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if (buf->nsamples > 0) {
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DSP_FlushDataCache(buf->data_vaddr, bufferSize);
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ndspChnWaveBufAdd(channel, buf);
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}
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}
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}
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for(i = 0; i < bufferCount; ++i)
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linearFree(buffers[i].data_pcm8);
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}
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void OSystem_3DS::initAudio() {
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_mixer = new Audio::MixerImpl(this, 22050);
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hasAudio = R_SUCCEEDED(ndspInit());
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_mixer->setReady(false);
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if (hasAudio) {
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s32 prio = 0;
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svcGetThreadPriority(&prio, CUR_THREAD_HANDLE);
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audioThread = threadCreate(&audioThreadFunc, _mixer, 32*1048, prio-1, -2, false);
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}
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}
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void OSystem_3DS::destroyAudio() {
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if (hasAudio) {
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exitAudioThread = true;
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threadJoin(audioThread, U64_MAX);
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threadFree(audioThread);
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ndspExit();
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}
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delete _mixer;
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_mixer = 0;
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}
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Audio::Mixer *OSystem_3DS::getMixer() {
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assert(_mixer);
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return _mixer;
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}
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