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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 <SDL.h>
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struct AudioContext
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{
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FAudio *faudio;
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bool output_5p1;
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AudioVoiceType effect_on_voice;
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FAudioMasteringVoice *mastering_voice;
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FAudioSubmixVoice *submix_voice;
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FAudioSourceVoice *source_voice;
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FAudioVoice *voices[3];
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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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FAudioEffectDescriptor reverb_effect;
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FAudioEffectChain effect_chain;
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ReverbParameters reverb_params;
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bool reverb_enabled;
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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->submix_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_create_voice(AudioContext *context, float *buffer, size_t buffer_size, int sample_rate, int num_channels)
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{
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// create reverb effect
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FAPO *fapo = NULL;
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uint32_t hr = FAudioCreateReverb(&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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// create effect chain
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context->reverb_effect.InitialState = context->reverb_enabled;
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context->reverb_effect.OutputChannels = (context->output_5p1) ? 6 : context->wav_channels;
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context->reverb_effect.pEffect = fapo;
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context->effect_chain.EffectCount = 1;
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context->effect_chain.pEffectDescriptors = &context->reverb_effect;
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FAudioEffectChain *voice_effect[3] = {NULL, NULL, NULL};
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voice_effect[context->effect_on_voice] = &context->effect_chain;
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// create a mastering voice
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uint32_t inChannels = context->wav_channels;
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if (context->output_5p1 && context->effect_on_voice != AudioVoiceType_Master)
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{
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inChannels = 6;
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}
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hr = FAudio_CreateMasteringVoice(
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context->faudio,
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&context->mastering_voice,
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inChannels,
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FAUDIO_DEFAULT_SAMPLERATE,
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0,
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0,
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voice_effect[AudioVoiceType_Master]
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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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context->voices[AudioVoiceType_Master] = context->mastering_voice;
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// create a submix voice
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inChannels = context->wav_channels;
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if (context->output_5p1 && context->effect_on_voice == AudioVoiceType_Source)
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{
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inChannels = 6;
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}
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hr = FAudio_CreateSubmixVoice(
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context->faudio,
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&context->submix_voice,
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inChannels,
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SAMPLERATE,
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0,
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0,
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NULL,
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voice_effect[AudioVoiceType_Submix]
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);
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context->voices[AudioVoiceType_Submix] = context->submix_voice;
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FAudioVoice_SetVolume(context->submix_voice, 1.0f, FAUDIO_COMMIT_NOW);
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// create a source voice
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FAudioSendDescriptor desc = {0, context->submix_voice};
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FAudioVoiceSends sends = {1, &desc};
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FAudioWaveFormatEx waveFormat;
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waveFormat.wFormatTag = 3;
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waveFormat.nChannels = num_channels;
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waveFormat.nSamplesPerSec = sample_rate;
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waveFormat.nAvgBytesPerSec = sample_rate * 4;
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waveFormat.nBlockAlign = num_channels * 4;
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waveFormat.wBitsPerSample = 32;
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waveFormat.cbSize = 0;
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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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&sends,
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voice_effect[AudioVoiceType_Source]
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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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context->voices[AudioVoiceType_Source] = context->source_voice;
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FAudioVoice_SetVolume(context->source_voice, 1.0f, FAUDIO_COMMIT_NOW);
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// submit the array
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SDL_zero(context->buffer);
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context->buffer.AudioBytes = 4 * buffer_size * num_channels;
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context->buffer.pAudioData = (uint8_t *)buffer;
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context->buffer.Flags = FAUDIO_END_OF_STREAM;
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context->buffer.PlayBegin = 0;
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context->buffer.PlayLength = buffer_size;
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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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}
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void faudio_reverb_set_params(AudioContext *context)
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{
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FAudioVoice_SetEffectParameters(
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context->voices[context->effect_on_voice],
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0,
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&context->reverb_params,
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sizeof(context->reverb_params),
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FAUDIO_COMMIT_NOW
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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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FAudioVoice_DestroyVoice(context->submix_voice);
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FAudioVoice_DestroyVoice(context->mastering_voice);
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}
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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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audio_create_voice(context, context->wav_samples, context->wav_sample_count, context->wav_samplerate, context->wav_channels);
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faudio_reverb_set_params(context);
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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_wave_stop(AudioContext *context)
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{
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FAudioSourceVoice_Stop(context->source_voice, FAUDIO_PLAY_TAILS, FAUDIO_COMMIT_NOW);
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}
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void faudio_effect_change(AudioContext *context, bool enabled, ReverbParameters *params)
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{
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if (context->reverb_enabled && !enabled)
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{
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FAudioVoice_DisableEffect(
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context->voices[context->effect_on_voice],
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0,
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FAUDIO_COMMIT_NOW
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);
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context->reverb_enabled = enabled;
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}
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else if (!context->reverb_enabled && enabled)
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{
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FAudioVoice_EnableEffect(
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context->voices[context->effect_on_voice],
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0,
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FAUDIO_COMMIT_NOW
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);
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context->reverb_enabled = enabled;
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}
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context->reverb_params = *params;
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faudio_reverb_set_params(context);
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}
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AudioContext *faudio_create_context(bool output_5p1, AudioVoiceType effect_on_voice)
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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_create_voice = faudio_create_voice;
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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_wave_stop = faudio_wave_stop;
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audio_effect_change = faudio_effect_change;
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// create Faudio object
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FAudio *faudio;
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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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// return a context object
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AudioContext *context = new AudioContext();
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context->faudio = faudio;
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context->output_5p1 = output_5p1;
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context->effect_on_voice = effect_on_voice;
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context->source_voice = NULL;
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context->submix_voice = NULL;
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context->mastering_voice = NULL;
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context->wav_samples = NULL;
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SDL_zero(context->reverb_params);
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context->reverb_enabled = false;
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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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