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