mirror of
https://github.com/libretro/RetroArch.git
synced 2024-12-04 22:46:46 +00:00
223 lines
5.5 KiB
C++
223 lines
5.5 KiB
C++
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the 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 along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../driver.h"
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#include <stdlib.h>
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#include <xtl.h>
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#include <xaudio2.h>
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#include "../general.h"
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#define MAX_BUFFERS 16
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#define MAX_BUFFERS_MASK 15
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struct XAudio : public IXAudio2VoiceCallback
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{
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XAudio() :
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buf(0), pXAudio2(0), pMasteringVoice(0),
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pSourceVoice(0), nonblock(false), bufsize(0),
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bufptr(0), write_buffer(0), buffers(0), hEvent(0)
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{}
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~XAudio()
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{
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if (pSourceVoice)
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{
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pSourceVoice->Stop(0, XAUDIO2_COMMIT_NOW);
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pSourceVoice->DestroyVoice();
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}
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if (pMasteringVoice)
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pMasteringVoice->DestroyVoice();
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if (pXAudio2)
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pXAudio2->Release();
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if (hEvent)
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CloseHandle(hEvent);
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delete[] buf;
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}
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bool init(unsigned rate, unsigned latency)
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{
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size_t bufsize_ = latency * rate / 1000;
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size_t size = bufsize_ * 2 * sizeof(int16_t);
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SSNES_LOG("XAudio2: Requesting %d ms latency, using %d ms latency.\n", latency, (int)bufsize_ * 1000 / rate);
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if (FAILED(XAudio2Create(&pXAudio2, 0)))
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return false;
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if (FAILED(pXAudio2->CreateMasteringVoice(&pMasteringVoice, 2, rate, 0, 0, NULL)))
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return false;
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WAVEFORMATEX wfx = {0};
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wfx.wFormatTag = WAVE_FORMAT_PCM;
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wfx.nChannels = 2;
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wfx.nSamplesPerSec = rate;
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wfx.nBlockAlign = 2 * sizeof(int16_t);
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wfx.wBitsPerSample = sizeof(int16_t) * 8;
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wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign;
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wfx.cbSize = 0;
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if (FAILED(pXAudio2->CreateSourceVoice(&pSourceVoice, &wfx,
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XAUDIO2_VOICE_NOSRC, XAUDIO2_DEFAULT_FREQ_RATIO, this, 0, 0)))
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return false;
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hEvent = CreateEvent(0, FALSE, FALSE, 0);
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bufsize = size / MAX_BUFFERS;
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buf = new uint8_t[bufsize * MAX_BUFFERS];
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memset(buf, 0, bufsize * MAX_BUFFERS);
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if (FAILED(pSourceVoice->Start(0)))
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return false;
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return true;
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}
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// It's really 16-bit, but we have to byteswap.
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size_t write(const uint8_t *buffer, size_t size)
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{
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if (nonblock)
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{
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size_t avail = bufsize * (MAX_BUFFERS - buffers - 1);
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if (avail == 0)
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return 0;
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if (avail < size)
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size = avail;
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}
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unsigned bytes = size;
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while (bytes)
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{
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unsigned need = min(bytes, bufsize - bufptr);
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uint8_t *base_write = buf + write_buffer * bufsize + bufptr;
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memcpy(base_write, buffer, need);
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bufptr += need;
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buffer += need;
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bytes -= need;
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if (bufptr == bufsize)
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{
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while (buffers == MAX_BUFFERS - 1)
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WaitForSingleObject(hEvent, INFINITE);
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XAUDIO2_BUFFER xa2buffer = {0};
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xa2buffer.AudioBytes = bufsize;
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xa2buffer.pAudioData = buf + write_buffer * bufsize;
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if (FAILED(pSourceVoice->SubmitSourceBuffer(&xa2buffer)))
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return 0;
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InterlockedIncrement(&buffers);
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bufptr = 0;
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write_buffer = (write_buffer + 1) & MAX_BUFFERS_MASK;
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}
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}
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return size;
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}
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STDMETHOD_(void, OnBufferStart) (void *) {}
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STDMETHOD_(void, OnBufferEnd) (void *)
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{
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InterlockedDecrement(&buffers);
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SetEvent(hEvent);
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}
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STDMETHOD_(void, OnLoopEnd) (void *) {}
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STDMETHOD_(void, OnStreamEnd) () {}
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STDMETHOD_(void, OnVoiceError) (void *, HRESULT) {}
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STDMETHOD_(void, OnVoiceProcessingPassEnd) () {}
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STDMETHOD_(void, OnVoiceProcessingPassStart) (UINT32) {}
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uint8_t *buf;
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IXAudio2 *pXAudio2;
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IXAudio2MasteringVoice *pMasteringVoice;
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IXAudio2SourceVoice *pSourceVoice;
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bool nonblock;
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unsigned bufsize;
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unsigned bufptr;
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unsigned write_buffer;
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volatile long buffers;
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HANDLE hEvent;
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};
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static void *xa_init(const char *device, unsigned rate, unsigned latency)
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{
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if (latency < 8)
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latency = 8; // Do not allow shenanigans.
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XAudio *xa = new XAudio;
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if (!xa->init(rate, latency))
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goto error;
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return xa;
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error:
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SSNES_ERR("Failed to init XAudio2.\n");
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delete xa;
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return NULL;
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}
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static ssize_t xa_write(void *data, const void *buf, size_t size)
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{
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XAudio *xa = (XAudio*)data;
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size_t ret = xa->write((const uint8_t*)buf, size);
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if (ret == 0)
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return -1;
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return ret;
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}
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static bool xa_stop(void *data)
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{
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(void)data;
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return true;
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}
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static void xa_set_nonblock_state(void *data, bool state)
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{
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XAudio *xa = (XAudio*)data;
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xa->nonblock = state;
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}
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static bool xa_start(void *data)
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{
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(void)data;
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return true;
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}
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static void xa_free(void *data)
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{
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XAudio *xa = (XAudio*)data;
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if (xa)
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delete xa;
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}
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const audio_driver_t audio_xdk360 = {
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xa_init,
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xa_write,
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xa_stop,
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xa_start,
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xa_set_nonblock_state,
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xa_free,
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NULL,
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"xdk360"
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};
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