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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
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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* Copyright (C) 2008 Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_WASAPI_SINK_H__
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#define __GST_WASAPI_SINK_H__
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#include "gstwasapiutil.h"
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G_BEGIN_DECLS
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#define GST_TYPE_WASAPI_SINK \
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(gst_wasapi_sink_get_type ())
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#define GST_WASAPI_SINK(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_WASAPI_SINK, GstWasapiSink))
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#define GST_WASAPI_SINK_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_WASAPI_SINK, GstWasapiSinkClass))
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#define GST_IS_WASAPI_SINK(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_WASAPI_SINK))
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#define GST_IS_WASAPI_SINK_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_WASAPI_SINK))
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typedef struct _GstWasapiSink GstWasapiSink;
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typedef struct _GstWasapiSinkClass GstWasapiSinkClass;
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struct _GstWasapiSink
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{
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GstAudioSink parent;
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IAudioClient *client;
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IAudioRenderClient *render_client;
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HANDLE event_handle;
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/* Actual size of the allocated buffer */
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guint buffer_frame_count;
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/* The mix format that wasapi prefers in shared mode */
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WAVEFORMATEX *mix_format;
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/* The probed caps that we can accept */
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GstCaps *cached_caps;
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/* properties */
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gint role;
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gboolean mute;
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wchar_t *device;
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};
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struct _GstWasapiSinkClass
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{
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GstAudioSinkClass parent_class;
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};
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GType gst_wasapi_sink_get_type (void);
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G_END_DECLS
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#endif /* __GST_WASAPI_SINK_H__ */
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