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wasapi: use device period size in shared mode.

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This commit is contained in:
Chris Xiong 2021-04-16 18:21:36 +08:00
parent 03fb32c979
commit 0d627c7c0b
1 changed files with 25 additions and 8 deletions
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33
src/drivers/fluid_wasapi.c
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@ -89,8 +89,15 @@ static const IID _IID_IAudioRenderClient =
* audio.periods still determines the buffer size, but has no direct impact on
* the latency (at least according to Microsoft). The valid range for
* audio.period-size may vary depending on the driver and sample rate.
* - In shared mode, audio.period-size is completely ignored. Instead, a value
* provided by the audio driver is used. In theory this means the latency in
* shared mode is out of fluidsynth's control, but you may still increase
* audio.periods for a larger buffer to fix buffer underruns in case there
* are any.
* - The sample rate and sample format of fluidsynth must be supported by the
* audio device in exclusive mode. Otherwise driver creation will fail.
* audio device in exclusive mode. Otherwise driver creation will fail. Use
* `fluidsynth ---query-audio-devices` to find out the modes supported by
* the soundcards installed on the system.
* - In shared mode, if the sample rate of the synth doesn't match what is
* configured in the 'advanced' tab of the audio device properties dialog,
* Windows will automatically resample the output (obviously). Windows
@ -331,7 +338,7 @@ void fluid_wasapi_audio_driver_settings(fluid_settings_t *settings)
static DWORD WINAPI fluid_wasapi_audio_run(void *p)
{
fluid_wasapi_audio_driver_t *dev = (fluid_wasapi_audio_driver_t *)p;
DWORD time_to_sleep = dev->buffer_duration * 1000 / 2;
DWORD time_to_sleep;
UINT32 pos;
DWORD len;
void *channels_out[2];
@ -349,11 +356,6 @@ static DWORD WINAPI fluid_wasapi_audio_run(void *p)
int needs_com_uninit = FALSE;
int i;
if(time_to_sleep < 1)
{
time_to_sleep = 1;
}
/* Clear format structure */
ZeroMemory(&wfx, sizeof(WAVEFORMATEXTENSIBLE));
@ -417,9 +419,19 @@ static DWORD WINAPI fluid_wasapi_audio_run(void *p)
}
else
{
fluid_long_long_t defp;
share_mode = AUDCLNT_SHAREMODE_SHARED;
FLUID_LOG(FLUID_DBG, "wasapi: using shared mode.");
dev->periods_reftime = 0;
//use default period size of the device
if(SUCCEEDED(IAudioClient_GetDevicePeriod(dev->aucl, &defp, NULL)))
{
dev->period_size = (int)(defp / 1e7 * dev->sample_rate);
dev->buffer_duration = dev->periods * dev->period_size / dev->sample_rate;
dev->buffer_duration_reftime = (fluid_long_long_t)(dev->buffer_duration * 1e7 + .5);
FLUID_LOG(FLUID_DBG, "wasapi: using device period size: %d", dev->period_size);
}
}
ret = IAudioClient_IsFormatSupported(dev->aucl, share_mode, (const WAVEFORMATEX *)&wfx, (WAVEFORMATEX **)&rwfx);
@ -486,6 +498,11 @@ static DWORD WINAPI fluid_wasapi_audio_run(void *p)
FLUID_LOG(FLUID_DBG, "wasapi: requested %d frames of buffers, got %u.", dev->periods * dev->period_size, dev->nframes);
dev->buffer_duration = dev->nframes / dev->sample_rate;
time_to_sleep = dev->buffer_duration * 1000 / 2;
if(time_to_sleep < 1)
{
time_to_sleep = 1;
}
dev->drybuf = FLUID_ARRAY(float *, dev->audio_channels * 2);
@ -779,7 +796,7 @@ static void fluid_wasapi_finddev_callback(IMMDevice *dev, void *data)
{
fluid_wasapi_finddev_data_t *d = (fluid_wasapi_finddev_data_t *)data;
int nsz;
char *name;
char *name = NULL;
wchar_t *id = NULL;
IPropertyStore *prop = NULL;
PROPVARIANT var;