mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-25 03:01:03 +00:00
1450851095
Both the source and the sink elements were broken in a number of ways: * prepare() was assuming that the format was always S16LE 2ch 44.1KHz. We now probe the preferred format with GetMixFormat(). * Device initialization was done with the wrong buffer size (buffer_time is in microseconds, not nanoseconds). * sink_write() and src_read() were just plain wrong and would never write or read anything useful. * Some functions in prepare() were always returning FALSE which meant trying to use the elements would *always* fail. * get_caps() and delay() were not implemented at all. TODO: support for >2 channels TODO: pro-audio low-latency TODO: SPDIF and other encoded passthroughs Three new properties are now implemented: role, mute, and device. * 'role' designates the stream role of the initialized device, see: https://msdn.microsoft.com/en-us/library/windows/desktop/dd370842(v=vs.85).aspx * 'device' is a system-wide GUIDesque string for a specific device. * 'mute' is a sink property and simply mutes it. On my Windows 8.1 system, the lowest latency that works is: wasapisrc buffer-time=20000 wasapisink buffer-time=10000 aka, 20ms and 10ms respectively. These values are close to the lowest possible with the IAudioClient interface. Further improvements require porting to IAudioClient2 or IAudioClient3. https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/low-latency-audio
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 2008 Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef __GST_WASAPI_UTIL_H__
|
|
#define __GST_WASAPI_UTIL_H__
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/audio/audio.h>
|
|
#include <gst/audio/gstaudiosrc.h>
|
|
#include <gst/audio/gstaudiosink.h>
|
|
|
|
#include <audioclient.h>
|
|
|
|
/* Device role enum property */
|
|
typedef enum
|
|
{
|
|
GST_WASAPI_DEVICE_ROLE_CONSOLE,
|
|
GST_WASAPI_DEVICE_ROLE_MULTIMEDIA,
|
|
GST_WASAPI_DEVICE_ROLE_COMMS
|
|
} GstWasapiDeviceRole;
|
|
#define GST_WASAPI_DEVICE_TYPE_ROLE (gst_wasapi_device_role_get_type())
|
|
GType gst_wasapi_device_role_get_type (void);
|
|
|
|
/* Utilities */
|
|
|
|
gint gst_wasapi_device_role_to_erole (gint role);
|
|
|
|
gint gst_wasapi_erole_to_device_role (gint erole);
|
|
|
|
const gchar *gst_wasapi_util_hresult_to_string (HRESULT hr);
|
|
|
|
gboolean
|
|
gst_wasapi_util_get_device_client (GstElement * element,
|
|
gboolean capture,
|
|
gint role, const wchar_t * device_name, IAudioClient ** ret_client);
|
|
|
|
gboolean gst_wasapi_util_get_render_client (GstElement * element,
|
|
IAudioClient * client, IAudioRenderClient ** ret_render_client);
|
|
|
|
gboolean gst_wasapi_util_get_capture_client (GstElement * element,
|
|
IAudioClient * client, IAudioCaptureClient ** ret_capture_client);
|
|
|
|
gboolean gst_wasapi_util_get_clock (GstElement * element,
|
|
IAudioClient * client, IAudioClock ** ret_clock);
|
|
|
|
GstCaps *gst_wasapi_util_waveformatex_to_caps (WAVEFORMATEXTENSIBLE * format,
|
|
GstCaps * template_caps);
|
|
|
|
#endif /* __GST_WASAPI_UTIL_H__ */
|