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#include "audio.h"
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#include <FAudio.h>
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#include <FAudioFX.h>
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#include <FAPO.h>
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struct AudioContext
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{
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FAudio *faudio;
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FAudioMasteringVoice *mastering_voice;
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FAudioSourceVoice *source_voice;
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unsigned int wav_channels;
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unsigned int wav_samplerate;
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drwav_uint64 wav_sample_count;
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float *wav_samples;
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FAudioBuffer buffer;
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};
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void faudio_destroy_context(AudioContext *context)
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{
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if (context != NULL)
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{
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FAudioVoice_DestroyVoice(context->source_voice);
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FAudioVoice_DestroyVoice(context->mastering_voice);
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FAudio_Release(context->faudio);
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delete context;
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}
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}
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void faudio_wave_load(AudioContext *context, AudioSampleWave sample, bool stereo)
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{
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if (context->source_voice)
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{
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FAudioVoice_DestroyVoice(context->source_voice);
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}
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/* Buffer data... */
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context->wav_samples = WAVS_Open(
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sample,
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stereo,
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&context->wav_channels,
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&context->wav_samplerate,
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&context->wav_sample_count
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);
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context->wav_sample_count /= context->wav_channels;
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context->buffer.Flags = FAUDIO_END_OF_STREAM;
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context->buffer.AudioBytes = 4 * context->wav_sample_count * context->wav_channels;
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context->buffer.pAudioData = (uint8_t*) context->wav_samples;
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context->buffer.PlayBegin = 0;
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context->buffer.PlayLength = context->wav_sample_count;
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context->buffer.LoopBegin = 0;
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context->buffer.LoopLength = 0;
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context->buffer.LoopCount = 0;
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context->buffer.pContext = NULL;
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/* Volume meter... */
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FAPO *fapo = NULL;
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uint32_t hr = FAudioCreateVolumeMeter(&fapo, 0);
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if (hr != 0)
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{
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return;
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}
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/* Effect chain... */
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FAudioEffectDescriptor vmDesc;
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vmDesc.InitialState = 1;
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vmDesc.OutputChannels = context->wav_channels;
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vmDesc.pEffect = fapo;
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FAudioEffectChain vmChain;
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vmChain.EffectCount = 1;
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vmChain.pEffectDescriptors = &vmDesc;
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/* Wave format... */
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FAudioWaveFormatEx waveFormat;
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waveFormat.wFormatTag = 3;
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waveFormat.nChannels = context->wav_channels;
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waveFormat.nSamplesPerSec = context->wav_samplerate;
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waveFormat.nAvgBytesPerSec = context->wav_samplerate * 4;
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waveFormat.nBlockAlign = context->wav_channels * 4;
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waveFormat.wBitsPerSample = 32;
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waveFormat.cbSize = 0;
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/*... Source voice, finally. */
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hr = FAudio_CreateSourceVoice(
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context->faudio,
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&context->source_voice,
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&waveFormat,
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0,
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FAUDIO_DEFAULT_FREQ_RATIO,
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NULL,
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NULL,
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&vmChain
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);
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if (hr != 0)
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{
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return;
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}
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fapo->Release(fapo);
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}
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void faudio_wave_play(AudioContext *context)
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{
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FAudioSourceVoice_Stop(context->source_voice, 0, FAUDIO_COMMIT_NOW);
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FAudioSourceVoice_FlushSourceBuffers(context->source_voice);
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FAudioSourceVoice_SubmitSourceBuffer(context->source_voice, &context->buffer, NULL);
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FAudioSourceVoice_Start(context->source_voice, 0, FAUDIO_COMMIT_NOW);
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}
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void faudio_update_volumemeter(AudioContext *context, float *peak, float *rms)
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{
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FAudioFXVolumeMeterLevels levels;
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levels.pPeakLevels = peak;
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levels.pRMSLevels = rms;
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levels.ChannelCount = context->wav_channels;
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if (context->source_voice != NULL)
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{
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FAudioVoice_GetEffectParameters(
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context->source_voice,
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0,
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&levels,
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sizeof(levels)
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);
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}
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}
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AudioContext* faudio_create_context()
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{
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// setup function pointers
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audio_destroy_context = faudio_destroy_context;
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audio_wave_load = faudio_wave_load;
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audio_wave_play = faudio_wave_play;
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audio_update_volumemeter = faudio_update_volumemeter;
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// create FAudio objects
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FAudio *faudio;
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FAudioMasteringVoice *master;
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uint32_t hr = FAudioCreate(&faudio, 0, FAUDIO_DEFAULT_PROCESSOR);
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if (hr != 0)
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{
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return NULL;
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}
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hr = FAudio_CreateMasteringVoice(
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faudio,
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&master,
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FAUDIO_DEFAULT_CHANNELS,
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FAUDIO_DEFAULT_SAMPLERATE,
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0,
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0,
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NULL
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);
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if (hr != 0)
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{
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return NULL;
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}
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// return a context object
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AudioContext *context = new AudioContext();
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context->faudio = faudio;
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context->mastering_voice = master;
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context->source_voice = NULL;
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context->wav_samples = NULL;
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// load the first wave
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audio_wave_load(context, (AudioSampleWave) 0, false);
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return context;
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}
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