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Make WASAPI return accurate latency information

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This commit is contained in:
Álex Román Núñez 2021-10-04 21:22:06 +02:00
parent 5b270278c8
commit fd4fa10d8b
2 changed files with 20 additions and 1 deletions
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18
drivers/wasapi/audio_driver_wasapi.cpp
View file

@ -274,7 +274,7 @@ Error AudioDriverWASAPI::audio_device_init(AudioDeviceWASAPI *p_device, bool p_c
ERR_PRINT("WASAPI: RegisterEndpointNotificationCallback error");
}
bool using_audio_client_3 = !p_capture; // IID_IAudioClient3 is only used for adjustable output latency (not input)
using_audio_client_3 = !p_capture; // IID_IAudioClient3 is only used for adjustable output latency (not input)
if (using_audio_client_3) {
hr = device->Activate(IID_IAudioClient3, CLSCTX_ALL, nullptr, (void **)&p_device->audio_client);
if (hr != S_OK) {
@ -378,6 +378,13 @@ Error AudioDriverWASAPI::audio_device_init(AudioDeviceWASAPI *p_device, bool p_c
// Due to WASAPI Shared Mode we have no control of the buffer size
buffer_frames = max_frames;
int64_t latency = 0;
audio_output.audio_client->GetStreamLatency(&latency);
// WASAPI REFERENCE_TIME units are 100 nanoseconds per unit
// https://docs.microsoft.com/en-us/windows/win32/directshow/reference-time
// Convert REFTIME to seconds as godot uses for latency
real_latency = (float)latency / (float)REFTIMES_PER_SEC;
} else {
IAudioClient3 *device_audio_client_3 = (IAudioClient3 *)p_device->audio_client;
@ -411,6 +418,11 @@ Error AudioDriverWASAPI::audio_device_init(AudioDeviceWASAPI *p_device, bool p_c
hr = device_audio_client_3->InitializeSharedAudioStream(0, period_frames, pwfex, nullptr);
ERR_FAIL_COND_V_MSG(hr != S_OK, ERR_CANT_OPEN, "WASAPI: InitializeSharedAudioStream failed with error 0x" + String::num_uint64(hr, 16) + ".");
uint32_t output_latency_in_frames;
WAVEFORMATEX *current_pwfex;
device_audio_client_3->GetCurrentSharedModeEnginePeriod(&current_pwfex, &output_latency_in_frames);
real_latency = (float)output_latency_in_frames / (float)current_pwfex->nSamplesPerSec;
CoTaskMemFree(current_pwfex);
}
if (p_capture) {
@ -518,6 +530,10 @@ int AudioDriverWASAPI::get_mix_rate() const {
return mix_rate;
}
float AudioDriverWASAPI::get_latency() {
return real_latency;
}
AudioDriver::SpeakerMode AudioDriverWASAPI::get_speaker_mode() const {
return get_speaker_mode_by_total_channels(channels);
}

3
drivers/wasapi/audio_driver_wasapi.h
View file

@ -72,6 +72,8 @@ class AudioDriverWASAPI : public AudioDriver {
int mix_rate = 0;
int buffer_frames = 0;
int target_latency_ms = 0;
float real_latency = 0.0;
bool using_audio_client_3 = false;
bool thread_exited = false;
mutable bool exit_thread = false;
@ -98,6 +100,7 @@ public:
virtual Error init();
virtual void start();
virtual int get_mix_rate() const;
virtual float get_latency();
virtual SpeakerMode get_speaker_mode() const;
virtual Array get_device_list();
virtual String get_device();