SameBoy/SDL/audio/xaudio2_7.c

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#include "xaudio2_7.h"
#include "audio.h"
#define AUDIO_FREQUENCY 96000
static IXAudio2 *xaudio2 = NULL;
static IXAudio2MasteringVoice *master_voice = NULL;
static IXAudio2SourceVoice *source_voice = NULL;
static bool playing = false;
static GB_sample_t sample_pool[0x2000];
static unsigned pos = 0;
#define BATCH_SIZE 256
static const WAVEFORMATEX wave_format = {
.wFormatTag = WAVE_FORMAT_PCM,
.nChannels = 2,
.nSamplesPerSec = AUDIO_FREQUENCY,
.nAvgBytesPerSec = AUDIO_FREQUENCY * 4,
.nBlockAlign = 4,
.wBitsPerSample = 16,
.cbSize = 0
};
static inline HRESULT XAudio2Create(IXAudio2 **ppXAudio2,
UINT32 Flags,
XAUDIO2_PROCESSOR XAudio2Processor)
{
IXAudio2 *pXAudio2;
LoadLibraryEx("xaudio2_7.dll", NULL, LOAD_LIBRARY_SEARCH_DEFAULT_DIRS);
HRESULT hr = CoCreateInstance(&CLSID_XAudio2, NULL, CLSCTX_INPROC_SERVER, &IID_IXAudio2, (void**)&pXAudio2);
if (SUCCEEDED(hr)) {
hr = pXAudio2->lpVtbl->Initialize(pXAudio2, Flags, XAudio2Processor);
}
if (SUCCEEDED(hr)) {
*ppXAudio2 = pXAudio2;
}
else {
pXAudio2->lpVtbl->Release(pXAudio2);
}
return hr;
}
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static bool _audio_is_playing(void)
{
return playing;
}
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static void _audio_clear_queue(void)
{
pos = 0;
IXAudio2SourceVoice_FlushSourceBuffers(source_voice);
}
static void _audio_set_paused(bool paused)
{
if (paused) {
playing = false;
IXAudio2SourceVoice_Stop(source_voice, 0, XAUDIO2_COMMIT_NOW);
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_audio_clear_queue();
}
else {
playing = true;
IXAudio2SourceVoice_Start(source_voice, 0, XAUDIO2_COMMIT_NOW);
}
}
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static unsigned _audio_get_frequency(void)
{
return AUDIO_FREQUENCY;
}
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static size_t _audio_get_queue_length(void)
{
static XAUDIO2_VOICE_STATE state;
IXAudio2SourceVoice_GetState(source_voice, &state);
return state.BuffersQueued * BATCH_SIZE + (pos & (BATCH_SIZE - 1));
}
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static void _audio_queue_sample(GB_sample_t *sample)
{
if (!playing) return;
static XAUDIO2_BUFFER buffer = {.AudioBytes = sizeof(*sample) * BATCH_SIZE, };
sample_pool[pos] = *sample;
buffer.pAudioData = (void *)&sample_pool[pos & ~(BATCH_SIZE - 1)];
pos++;
pos &= 0x1fff;
if ((pos & (BATCH_SIZE - 1)) == 0) {
IXAudio2SourceVoice_SubmitSourceBuffer(source_voice, &buffer, NULL);
}
}
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static bool _audio_init(void)
{
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
if (FAILED(hr)) {
fprintf(stderr, "CoInitializeEx failed: %lx\n", hr);
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return false;
}
hr = XAudio2Create(&xaudio2, 0, XAUDIO2_DEFAULT_PROCESSOR);
if (FAILED(hr)) {
fprintf(stderr, "XAudio2Create failed: %lx\n", hr);
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return false;
}
hr = IXAudio2_CreateMasteringVoice(xaudio2, &master_voice,
2, // 2 channels
AUDIO_FREQUENCY,
0, // Flags
0, // Device index
NULL // Effect chain
);
if (FAILED(hr)) {
fprintf(stderr, "CreateMasteringVoice failed: %lx\n", hr);
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return false;
}
hr = IXAudio2_CreateSourceVoice(xaudio2, &source_voice, &wave_format, 0, XAUDIO2_DEFAULT_FREQ_RATIO, NULL, NULL, NULL);
if (FAILED(hr)) {
fprintf(stderr, "CreateSourceVoice failed: %lx\n", hr);
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return false;
}
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return true;
}
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GB_AUDIO_DRIVER(XAudio2_7);