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wasapi: Increase thread priority to reduce glitches

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This is particularly important when running in exclusive mode because
any delays will immediately cause glitching.

The MinGW version in Cerbero is too old, so we can only enable this when
building with MSVC or when people build GStreamer for MSYS2 or other
MinGW-based distributions.

To force-enable this code when building with MinGW, build with
CFLAGS="-DGST_FORCE_WIN_AVRT -lavrt".

https://bugzilla.gnome.org/show_bug.cgi?id=793289
This commit is contained in:
Nirbheek Chauhan 2018-02-06 23:45:02 +05:30
parent 6ecbb7556a
commit 62b6224e37
4 changed files with 38 additions and 0 deletions
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18
sys/wasapi/gstwasapisink.c
View file

@ -40,6 +40,8 @@
#include "gstwasapisink.h"
#include <avrt.h>
GST_DEBUG_CATEGORY_STATIC (gst_wasapi_sink_debug);
#define GST_CAT_DEFAULT gst_wasapi_sink_debug
@ -472,6 +474,15 @@ gst_wasapi_sink_prepare (GstAudioSink * asink, GstAudioRingBufferSpec * spec)
gst_audio_ring_buffer_set_channel_positions (GST_AUDIO_BASE_SINK
(self)->ringbuffer, self->positions);
#if defined(_MSC_VER) || defined(GST_FORCE_WIN_AVRT)
/* Increase the thread priority to reduce glitches */
{
DWORD taskIndex = 0;
self->thread_priority_handle =
AvSetMmThreadCharacteristics (TEXT ("Pro Audio"), &taskIndex);
}
#endif
res = TRUE;
beach:
@ -489,6 +500,13 @@ gst_wasapi_sink_unprepare (GstAudioSink * asink)
if (self->sharemode == AUDCLNT_SHAREMODE_EXCLUSIVE)
CoUninitialize ();
#if defined(_MSC_VER) || defined(GST_FORCE_WIN_AVRT)
if (self->thread_priority_handle != NULL) {
AvRevertMmThreadCharacteristics (self->thread_priority_handle);
self->thread_priority_handle = NULL;
}
#endif
if (self->client != NULL) {
IAudioClient_Stop (self->client);
}

1
sys/wasapi/gstwasapisink.h
View file

@ -44,6 +44,7 @@ struct _GstWasapiSink
IAudioClient *client;
IAudioRenderClient *render_client;
HANDLE event_handle;
HANDLE thread_priority_handle;
/* Actual size of the allocated buffer */
guint buffer_frame_count;

18
sys/wasapi/gstwasapisrc.c
View file

@ -38,6 +38,8 @@
#include "gstwasapisrc.h"
#include <avrt.h>
GST_DEBUG_CATEGORY_STATIC (gst_wasapi_src_debug);
#define GST_CAT_DEFAULT gst_wasapi_src_debug
@ -477,6 +479,15 @@ gst_wasapi_src_prepare (GstAudioSrc * asrc, GstAudioRingBufferSpec * spec)
gst_audio_ring_buffer_set_channel_positions (GST_AUDIO_BASE_SRC
(self)->ringbuffer, self->positions);
#if defined(_MSC_VER) || defined(GST_FORCE_WIN_AVRT)
/* Increase the thread priority to reduce glitches */
{
DWORD taskIndex = 0;
self->thread_priority_handle =
AvSetMmThreadCharacteristics (TEXT ("Pro Audio"), &taskIndex);
}
#endif
res = TRUE;
beach:
@ -499,6 +510,13 @@ gst_wasapi_src_unprepare (GstAudioSrc * asrc)
if (self->sharemode == AUDCLNT_SHAREMODE_EXCLUSIVE)
CoUninitialize ();
#if defined(_MSC_VER) || defined(GST_FORCE_WIN_AVRT)
if (self->thread_priority_handle != NULL) {
AvRevertMmThreadCharacteristics (self->thread_priority_handle);
self->thread_priority_handle = NULL;
}
#endif
if (self->client != NULL) {
IAudioClient_Stop (self->client);
}

1
sys/wasapi/gstwasapisrc.h
View file

@ -46,6 +46,7 @@ struct _GstWasapiSrc
guint64 client_clock_freq;
IAudioCaptureClient *capture_client;
HANDLE event_handle;
HANDLE thread_priority_handle;
/* Actual size of the allocated buffer */
guint buffer_frame_count;