Example pipelines

1

gst-launch-1.0 -v audiotestsrc samplesperbuffer=160 ! wasapisink

Generate 20 ms buffers and render to the default audio device.

1

gst-launch-1.0 -v audiotestsrc samplesperbuffer=160 ! wasapisink low-latency=true

Same as above, but with the minimum possible latency

struct GstWasapiSink

struct GstWasapiSink {
  GstAudioSink parent;

  IMMDevice *device;
  IAudioClient *client;
  IAudioRenderClient *render_client;
  HANDLE event_handle;
  /* Client was reset, so it needs to be started again */
  gboolean client_needs_restart;

  /* Actual size of the allocated buffer */
  guint buffer_frame_count;
  /* The mix format that wasapi prefers in shared mode */
  WAVEFORMATEX *mix_format;
  /* The probed caps that we can accept */
  GstCaps *cached_caps;
  /* The channel positions in the data to be written to the device we
   * will pass this to GstAudioRingbuffer so it can to it translate
   * from the native GStreamer channel layout. */
  GstAudioChannelPosition *positions;

  /* properties */
  gint role;
  gint sharemode;
  gboolean mute;
  gboolean low_latency;
  gboolean try_audioclient3;
  wchar_t *device_strid;
};

The “role” property

  “role”                     GstWasapiDeviceRole

Role of the device: communications, multimedia, etc

Flags: Read / Write

Default value: console

The “device” property

  “device”                   gchar *

WASAPI playback device as a GUID string

Flags: Read / Write

The “mute” property

  “mute”                     gboolean

Mute state of this stream

Flags: Read / Write

Default value: FALSE

The “exclusive” property

  “exclusive”                gboolean

Open the device in exclusive mode

Flags: Read / Write

Default value: FALSE

The “low-latency” property

  “low-latency”              gboolean

Optimize all settings for lowest latency. Always safe to enable.

Flags: Read / Write

Default value: FALSE

The “use-audioclient3” property

  “use-audioclient3”         gboolean

Whether to use the Windows 10 AudioClient3 API when available

Flags: Read / Write

Default value: TRUE