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godot/drivers/wasapi/audio_driver_wasapi.cpp
Pedro J. Estébanez 868211eba7 Fix WASAPI cleanup 
Audio drivers are destroyed on OS destruction, when memory management is no longer available so they must release their dynamic allocations explicitly in their `finish()` method.
2017-09-12 17:47:17 +02:00

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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 "globals.h"
#include "os/os.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;
}
AudioDriverSW::OutputFormat AudioDriverWASAPI::get_output_format() const {
return OUTPUT_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;
}
samples_in.clear();
}
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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