mirror of
https://github.com/thunderbrewhq/thunderbrew
synced 2025-12-13 03:32:28 +00:00
287 lines
8.4 KiB
C
287 lines
8.4 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#ifdef SDL_AUDIO_DRIVER_N3DS
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// N3DS Audio driver
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#include "../SDL_sysaudio.h"
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#include "SDL_n3dsaudio.h"
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#define N3DSAUDIO_DRIVER_NAME "n3ds"
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static dspHookCookie dsp_hook;
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static SDL_AudioDevice *audio_device;
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// fully local functions related to the wavebufs / DSP, not the same as the `device->lock` SDL_Mutex!
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static SDL_INLINE void contextLock(SDL_AudioDevice *device)
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{
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LightLock_Lock(&device->hidden->lock);
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}
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static SDL_INLINE void contextUnlock(SDL_AudioDevice *device)
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{
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LightLock_Unlock(&device->hidden->lock);
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}
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static void N3DSAUD_DspHook(DSP_HookType hook)
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{
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if (hook == DSPHOOK_ONCANCEL) {
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contextLock(audio_device);
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audio_device->hidden->isCancelled = true;
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SDL_AudioDeviceDisconnected(audio_device);
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CondVar_Broadcast(&audio_device->hidden->cv);
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contextUnlock(audio_device);
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}
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}
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static void AudioFrameFinished(void *vdevice)
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{
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bool shouldBroadcast = false;
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unsigned i;
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SDL_AudioDevice *device = (SDL_AudioDevice *)vdevice;
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contextLock(device);
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for (i = 0; i < NUM_BUFFERS; i++) {
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if (device->hidden->waveBuf[i].status == NDSP_WBUF_DONE) {
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device->hidden->waveBuf[i].status = NDSP_WBUF_FREE;
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shouldBroadcast = true;
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}
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}
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if (shouldBroadcast) {
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CondVar_Broadcast(&device->hidden->cv);
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}
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contextUnlock(device);
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}
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static bool N3DSAUDIO_OpenDevice(SDL_AudioDevice *device)
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{
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Result ndsp_init_res;
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Uint8 *data_vaddr;
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float mix[12];
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device->hidden = (struct SDL_PrivateAudioData *)SDL_calloc(1, sizeof(*device->hidden));
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if (!device->hidden) {
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return false;
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}
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// Initialise the DSP service
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ndsp_init_res = ndspInit();
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if (R_FAILED(ndsp_init_res)) {
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if ((R_SUMMARY(ndsp_init_res) == RS_NOTFOUND) && (R_MODULE(ndsp_init_res) == RM_DSP)) {
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return SDL_SetError("DSP init failed: dspfirm.cdc missing!");
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} else {
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return SDL_SetError("DSP init failed. Error code: 0x%lX", ndsp_init_res);
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}
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}
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// Initialise internal state
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LightLock_Init(&device->hidden->lock);
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CondVar_Init(&device->hidden->cv);
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if (device->spec.channels > 2) {
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device->spec.channels = 2;
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}
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Uint32 format = 0;
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SDL_AudioFormat test_format;
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const SDL_AudioFormat *closefmts = SDL_ClosestAudioFormats(device->spec.format);
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while ((test_format = *(closefmts++)) != 0) {
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if (test_format == SDL_AUDIO_S8) { // Signed 8-bit audio supported
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format = (device->spec.channels == 2) ? NDSP_FORMAT_STEREO_PCM8 : NDSP_FORMAT_MONO_PCM8;
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break;
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} else if (test_format == SDL_AUDIO_S16) { // Signed 16-bit audio supported
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format = (device->spec.channels == 2) ? NDSP_FORMAT_STEREO_PCM16 : NDSP_FORMAT_MONO_PCM16;
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break;
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}
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}
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if (!test_format) { // shouldn't happen, but just in case...
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return SDL_SetError("No supported audio format found.");
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}
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device->spec.format = test_format;
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// Update the fragment size as size in bytes
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SDL_UpdatedAudioDeviceFormat(device);
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// Allocate mixing buffer
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if (device->buffer_size >= SDL_MAX_UINT32 / 2) {
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return SDL_SetError("Mixing buffer is too large.");
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}
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device->hidden->mixbuf = (Uint8 *)SDL_malloc(device->buffer_size);
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if (!device->hidden->mixbuf) {
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return false;
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}
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SDL_memset(device->hidden->mixbuf, device->silence_value, device->buffer_size);
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data_vaddr = (Uint8 *)linearAlloc(device->buffer_size * NUM_BUFFERS);
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if (!data_vaddr) {
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return SDL_OutOfMemory();
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}
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SDL_memset(data_vaddr, 0, device->buffer_size * NUM_BUFFERS);
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DSP_FlushDataCache(data_vaddr, device->buffer_size * NUM_BUFFERS);
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device->hidden->nextbuf = 0;
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ndspChnReset(0);
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ndspChnSetInterp(0, NDSP_INTERP_LINEAR);
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ndspChnSetRate(0, device->spec.freq);
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ndspChnSetFormat(0, format);
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SDL_zeroa(mix);
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mix[0] = mix[1] = 1.0f;
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ndspChnSetMix(0, mix);
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SDL_memset(device->hidden->waveBuf, 0, sizeof(ndspWaveBuf) * NUM_BUFFERS);
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const int sample_frame_size = SDL_AUDIO_FRAMESIZE(device->spec);
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for (unsigned i = 0; i < NUM_BUFFERS; i++) {
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device->hidden->waveBuf[i].data_vaddr = data_vaddr;
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device->hidden->waveBuf[i].nsamples = device->buffer_size / sample_frame_size;
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data_vaddr += device->buffer_size;
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}
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// Setup callback
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audio_device = device;
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ndspSetCallback(AudioFrameFinished, device);
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dspHook(&dsp_hook, N3DSAUD_DspHook);
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return true;
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}
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static bool N3DSAUDIO_PlayDevice(SDL_AudioDevice *device, const Uint8 *buffer, int buflen)
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{
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contextLock(device);
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const size_t nextbuf = device->hidden->nextbuf;
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if (device->hidden->isCancelled ||
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device->hidden->waveBuf[nextbuf].status != NDSP_WBUF_FREE) {
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contextUnlock(device);
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return true; // !!! FIXME: is this a fatal error? If so, this should return false.
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}
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device->hidden->nextbuf = (nextbuf + 1) % NUM_BUFFERS;
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contextUnlock(device);
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SDL_memcpy((void *)device->hidden->waveBuf[nextbuf].data_vaddr, buffer, buflen);
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DSP_FlushDataCache(device->hidden->waveBuf[nextbuf].data_vaddr, buflen);
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ndspChnWaveBufAdd(0, &device->hidden->waveBuf[nextbuf]);
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return true;
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}
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static bool N3DSAUDIO_WaitDevice(SDL_AudioDevice *device)
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{
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contextLock(device);
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while (!device->hidden->isCancelled && !SDL_GetAtomicInt(&device->shutdown) &&
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device->hidden->waveBuf[device->hidden->nextbuf].status != NDSP_WBUF_FREE) {
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CondVar_Wait(&device->hidden->cv, &device->hidden->lock);
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}
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contextUnlock(device);
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return true;
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}
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static Uint8 *N3DSAUDIO_GetDeviceBuf(SDL_AudioDevice *device, int *buffer_size)
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{
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return device->hidden->mixbuf;
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}
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static void N3DSAUDIO_CloseDevice(SDL_AudioDevice *device)
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{
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if (!device->hidden) {
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return;
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}
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contextLock(device);
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dspUnhook(&dsp_hook);
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ndspSetCallback(NULL, NULL);
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if (!device->hidden->isCancelled) {
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ndspChnReset(0);
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SDL_memset(device->hidden->waveBuf, 0, sizeof(ndspWaveBuf) * NUM_BUFFERS);
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CondVar_Broadcast(&device->hidden->cv);
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}
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contextUnlock(device);
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ndspExit();
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if (device->hidden->waveBuf[0].data_vaddr) {
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linearFree((void *)device->hidden->waveBuf[0].data_vaddr);
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}
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if (device->hidden->mixbuf) {
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SDL_free(device->hidden->mixbuf);
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device->hidden->mixbuf = NULL;
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}
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SDL_free(device->hidden);
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device->hidden = NULL;
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}
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static void N3DSAUDIO_ThreadInit(SDL_AudioDevice *device)
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{
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s32 current_priority = 0x30;
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svcGetThreadPriority(¤t_priority, CUR_THREAD_HANDLE);
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current_priority--;
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// 0x18 is reserved for video, 0x30 is the default for main thread
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current_priority = SDL_clamp(current_priority, 0x19, 0x2F);
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svcSetThreadPriority(CUR_THREAD_HANDLE, current_priority);
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}
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static bool N3DSAUDIO_Init(SDL_AudioDriverImpl *impl)
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{
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impl->OpenDevice = N3DSAUDIO_OpenDevice;
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impl->PlayDevice = N3DSAUDIO_PlayDevice;
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impl->WaitDevice = N3DSAUDIO_WaitDevice;
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impl->GetDeviceBuf = N3DSAUDIO_GetDeviceBuf;
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impl->CloseDevice = N3DSAUDIO_CloseDevice;
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impl->ThreadInit = N3DSAUDIO_ThreadInit;
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impl->OnlyHasDefaultPlaybackDevice = true;
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// Should be possible, but micInit would fail
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impl->HasRecordingSupport = false;
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return true;
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}
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AudioBootStrap N3DSAUDIO_bootstrap = {
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N3DSAUDIO_DRIVER_NAME,
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"SDL N3DS audio driver",
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N3DSAUDIO_Init,
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false,
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false
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};
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#endif // SDL_AUDIO_DRIVER_N3DS
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