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virtualx-engine/drivers/wasapi/audio_driver_wasapi.cpp
Marcelo Fernandez f231eadc9e Corrections to audio buffer size calculations
2017-09-01 11:12:13 -03:00

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/*************************************************************************/
/* audio_driver_wasapi.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifdef WASAPI_ENABLED
#include "audio_driver_wasapi.h"
#include "os/os.h"
#include "project_settings.h"
const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator);
const IID IID_IAudioClient = __uuidof(IAudioClient);
const IID IID_IAudioRenderClient = __uuidof(IAudioRenderClient);
Error AudioDriverWASAPI::init_device() {
WAVEFORMATEX *pwfex;
IMMDeviceEnumerator *enumerator = NULL;
IMMDevice *device = NULL;
CoInitialize(NULL);
HRESULT hr = CoCreateInstance(CLSID_MMDeviceEnumerator, NULL, CLSCTX_ALL, IID_IMMDeviceEnumerator, (void **)&enumerator);
ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
hr = enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &device);
ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
hr = device->Activate(IID_IAudioClient, CLSCTX_ALL, NULL, (void **)&audio_client);
ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
hr = audio_client->GetMixFormat(&pwfex);
ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
// Since we're using WASAPI Shared Mode we can't control any of these, we just tag along
channels = pwfex->nChannels;
mix_rate = pwfex->nSamplesPerSec;
format_tag = pwfex->wFormatTag;
bits_per_sample = pwfex->wBitsPerSample;
switch (channels) {
case 2: // Stereo
case 6: // Surround 5.1
case 8: // Surround 7.1
break;
default:
ERR_PRINT("WASAPI: Unsupported number of channels");
ERR_FAIL_V(ERR_CANT_OPEN);
break;
}
if (format_tag == WAVE_FORMAT_EXTENSIBLE) {
WAVEFORMATEXTENSIBLE *wfex = (WAVEFORMATEXTENSIBLE *)pwfex;
if (wfex->SubFormat == KSDATAFORMAT_SUBTYPE_PCM) {
format_tag = WAVE_FORMAT_PCM;
} else if (wfex->SubFormat == KSDATAFORMAT_SUBTYPE_IEEE_FLOAT) {
format_tag = WAVE_FORMAT_IEEE_FLOAT;
} else {
ERR_PRINT("WASAPI: Format not supported");
ERR_FAIL_V(ERR_CANT_OPEN);
}
} else {
if (format_tag != WAVE_FORMAT_PCM && format_tag != WAVE_FORMAT_IEEE_FLOAT) {
ERR_PRINT("WASAPI: Format not supported");
ERR_FAIL_V(ERR_CANT_OPEN);
}
}
hr = audio_client->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK, 0, 0, pwfex, NULL);
ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
event = CreateEvent(NULL, FALSE, FALSE, NULL);
ERR_FAIL_COND_V(event == NULL, ERR_CANT_OPEN);
hr = audio_client->SetEventHandle(event);
ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
hr = audio_client->GetService(IID_IAudioRenderClient, (void **)&render_client);
ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
UINT32 max_frames;
hr = audio_client->GetBufferSize(&max_frames);
ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
// Due to WASAPI Shared Mode we have no control of the buffer size
buffer_frames = max_frames;
// Sample rate is independent of channels (ref: https://stackoverflow.com/questions/11048825/audio-sample-frequency-rely-on-channels)
buffer_size = buffer_frames * channels;
samples_in.resize(buffer_size);
if (OS::get_singleton()->is_stdout_verbose()) {
print_line("audio buffer frames: " + itos(buffer_frames) + " calculated latency: " + itos(buffer_frames * 1000 / mix_rate) + "ms");
}
return OK;
}
Error AudioDriverWASAPI::finish_device() {
if (audio_client) {
if (active) {
audio_client->Stop();
active = false;
}
}
if (render_client) {
render_client->Release();
render_client = NULL;
}
if (audio_client) {
audio_client->Release();
audio_client = NULL;
}
return OK;
}
Error AudioDriverWASAPI::init() {
Error err = init_device();
ERR_FAIL_COND_V(err != OK, err);
active = false;
exit_thread = false;
thread_exited = false;
mutex = Mutex::create(true);
thread = Thread::create(thread_func, this);
return OK;
}
Error AudioDriverWASAPI::reopen() {
Error err = finish_device();
if (err != OK) {
ERR_PRINT("WASAPI: finish_device error");
} else {
err = init_device();
if (err != OK) {
ERR_PRINT("WASAPI: init_device error");
} else {
start();
}
}
return err;
}
int AudioDriverWASAPI::get_mix_rate() const {
return mix_rate;
}
AudioDriver::SpeakerMode AudioDriverWASAPI::get_speaker_mode() const {
return SPEAKER_MODE_STEREO;
}
void AudioDriverWASAPI::thread_func(void *p_udata) {
AudioDriverWASAPI *ad = (AudioDriverWASAPI *)p_udata;
while (!ad->exit_thread) {
if (ad->active) {
ad->lock();
ad->audio_server_process(ad->buffer_frames, ad->samples_in.ptr());
ad->unlock();
} else {
for (unsigned int i = 0; i < ad->buffer_size; i++) {
ad->samples_in[i] = 0;
}
}
unsigned int left_frames = ad->buffer_frames;
unsigned int buffer_idx = 0;
while (left_frames > 0) {
WaitForSingleObject(ad->event, 1000);
UINT32 cur_frames;
HRESULT hr = ad->audio_client->GetCurrentPadding(&cur_frames);
if (hr == S_OK) {
// Check how much frames are available on the WASAPI buffer
UINT32 avail_frames = ad->buffer_frames - cur_frames;
UINT32 write_frames = avail_frames > left_frames ? left_frames : avail_frames;
BYTE *buffer = NULL;
hr = ad->render_client->GetBuffer(write_frames, &buffer);
if (hr == S_OK) {
// We're using WASAPI Shared Mode so we must convert the buffer
if (ad->format_tag == WAVE_FORMAT_PCM) {
switch (ad->bits_per_sample) {
case 8:
for (unsigned int i = 0; i < write_frames * ad->channels; i++) {
((int8_t *)buffer)[i] = ad->samples_in[buffer_idx++] >> 24;
}
break;
case 16:
for (unsigned int i = 0; i < write_frames * ad->channels; i++) {
((int16_t *)buffer)[i] = ad->samples_in[buffer_idx++] >> 16;
}
break;
case 24:
for (unsigned int i = 0; i < write_frames * ad->channels; i++) {
int32_t sample = ad->samples_in[buffer_idx++];
((int8_t *)buffer)[i * 3 + 2] = sample >> 24;
((int8_t *)buffer)[i * 3 + 1] = sample >> 16;
((int8_t *)buffer)[i * 3 + 0] = sample >> 8;
}
break;
case 32:
for (unsigned int i = 0; i < write_frames * ad->channels; i++) {
((int32_t *)buffer)[i] = ad->samples_in[buffer_idx++];
}
break;
}
} else if (ad->format_tag == WAVE_FORMAT_IEEE_FLOAT) {
for (unsigned int i = 0; i < write_frames * ad->channels; i++) {
((float *)buffer)[i] = (ad->samples_in[buffer_idx++] >> 16) / 32768.f;
}
} else {
ERR_PRINT("WASAPI: Unknown format tag");
ad->exit_thread = true;
}
hr = ad->render_client->ReleaseBuffer(write_frames, 0);
if (hr != S_OK) {
ERR_PRINT("WASAPI: Release buffer error");
}
left_frames -= write_frames;
} else if (hr == AUDCLNT_E_DEVICE_INVALIDATED) {
// Device is not valid anymore, reopen it
Error err = ad->reopen();
if (err != OK) {
ad->exit_thread = true;
} else {
// We reopened the device and samples_in may have resized, so invalidate the current left_frames
left_frames = 0;
}
} else {
ERR_PRINT("WASAPI: Get buffer error");
ad->exit_thread = true;
}
} else if (hr == AUDCLNT_E_DEVICE_INVALIDATED) {
// Device is not valid anymore, reopen it
Error err = ad->reopen();
if (err != OK) {
ad->exit_thread = true;
} else {
// We reopened the device and samples_in may have resized, so invalidate the current left_frames
left_frames = 0;
}
} else {
ERR_PRINT("WASAPI: GetCurrentPadding error");
}
}
}
ad->thread_exited = true;
}
void AudioDriverWASAPI::start() {
HRESULT hr = audio_client->Start();
if (hr != S_OK) {
ERR_PRINT("WASAPI: Start failed");
} else {
active = true;
}
}
void AudioDriverWASAPI::lock() {
if (mutex)
mutex->lock();
}
void AudioDriverWASAPI::unlock() {
if (mutex)
mutex->unlock();
}
void AudioDriverWASAPI::finish() {
if (thread) {
exit_thread = true;
Thread::wait_to_finish(thread);
memdelete(thread);
thread = NULL;
}
finish_device();
if (mutex) {
memdelete(mutex);
mutex = NULL;
}
}
AudioDriverWASAPI::AudioDriverWASAPI() {
audio_client = NULL;
render_client = NULL;
mutex = NULL;
thread = NULL;
format_tag = 0;
bits_per_sample = 0;
samples_in.clear();
buffer_size = 0;
channels = 0;
mix_rate = 0;
buffer_frames = 0;
thread_exited = false;
exit_thread = false;
active = false;
}
#endif
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