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Simplify latency and buffer length calculations

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This commit is contained in:
Zoran Vuckovic 2017-05-22 18:47:48 +02:00
parent 554519457b
commit c045b80a5a
1 changed files with 12 additions and 19 deletions
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31
audio/drivers/wasapi.c
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@ -269,12 +269,9 @@ static IAudioClient *wasapi_init_client_sh(IMMDevice *device,
IAudioClient *client = NULL;
bool float_fmt_res = *float_fmt;
unsigned rate_res = *rate;
REFERENCE_TIME default_period = 0;
REFERENCE_TIME device_period = 0;
REFERENCE_TIME stream_latency = 0;
UINT32 buffer_length = 0;
double sh_buffer_latency = 0.0;
settings_t *settings = config_get_ptr();
unsigned sh_buffer_length = settings->uints.audio_wasapi_sh_buffer_length;
hr = device->lpVtbl->Activate(device, &IID_IAudioClient,
CLSCTX_ALL, NULL, (void**)&client);
@ -324,19 +321,17 @@ static IAudioClient *wasapi_init_client_sh(IMMDevice *device,
WASAPI_HR_CHECK(hr, "IAudioClient::Initialize", goto error);
*float_fmt = float_fmt_res;
*rate = rate_res;
*latency = 0.0;
*rate = rate_res;
*latency = 0.0;
/* next two calls are allowed to fail (we losing latency info only) */
hr = client->lpVtbl->GetStreamLatency(client, &stream_latency);
WASAPI_HR_WARN(hr, "IAudioClient::GetStreamLatency", return client);
hr = client->lpVtbl->GetDevicePeriod(client, &default_period, NULL);
hr = client->lpVtbl->GetDevicePeriod(client, &device_period, NULL);
WASAPI_HR_WARN(hr, "IAudioClient::GetDevicePeriod", return client);
if (sh_buffer_length)
sh_buffer_latency = 1000.0 / rate_res * sh_buffer_length;
*latency = (double)(stream_latency + default_period) / 10000.0 + sh_buffer_latency;
*latency = (double)(stream_latency + device_period) / 10000.0;
return client;
@ -358,7 +353,6 @@ static IAudioClient *wasapi_init_client_ex(IMMDevice *device,
REFERENCE_TIME default_period = 0;
REFERENCE_TIME minimum_period = 0;
REFERENCE_TIME buffer_duration = 0;
REFERENCE_TIME stream_latency = 0;
UINT32 buffer_length = 0;
hr = device->lpVtbl->Activate(device, &IID_IAudioClient,
@ -368,8 +362,8 @@ static IAudioClient *wasapi_init_client_ex(IMMDevice *device,
hr = client->lpVtbl->GetDevicePeriod(client, &default_period, &minimum_period);
WASAPI_HR_CHECK(hr, "IAudioClient::GetDevicePeriod", goto error);
/* buffer_duration is 2/3 of requested latency (in 100ns units) */
buffer_duration = *latency * 10000.0 * 2.0 / 3.0;
/* buffer_duration is in 100ns units */
buffer_duration = *latency * 10000.0;
if (buffer_duration < minimum_period)
buffer_duration = minimum_period;
@ -439,15 +433,14 @@ static IAudioClient *wasapi_init_client_ex(IMMDevice *device,
WASAPI_HR_CHECK(hr, "IAudioClient::Initialize", goto error);
*float_fmt = float_fmt_res;
*rate = rate_res;
*latency = 0.0;
*rate = rate_res;
*latency = 0.0;
/* next call is allowed to fail (we losing latency info only) */
hr = client->lpVtbl->GetStreamLatency(client, &stream_latency);
WASAPI_HR_WARN(hr, "IAudioClient::GetStreamLatency", return client);
hr = client->lpVtbl->GetBufferSize(client, &buffer_length);
WASAPI_HR_WARN(hr, "IAudioClient::GetBufferSize", return client);
/* our buffer latency is half of WASAPI internal two-buffer latency */
*latency = (double)stream_latency / 10000.0 * 1.5;
*latency = (double)buffer_length * 1000.0 / rate_res;
return client;