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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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a668de747f
An oddness of wasapi loopback feature is that capture client will not produce any data if there's no outputting sound to corresponding render client. In other words, if there's no sound to render, capture task will stall. As an option to solve such issue, we can add timeout to wake up from capture thread if there's no incoming data within given time interval. But it seems to be glitch prone. Another approach is that we can keep pushing silence data into render client so that capture client can keep capturing data (even if it's just silence). This patch will choose the latter one because it's more straightforward way and it's likely produce glitchless sound than former approach. A bonus point of this approach is that loopback capture on Windows7/8 will work with this patch. Note that there's an OS bug prior to Windows10 when loopback capture client is running with event-driven mode. To work around the bug, event signalling should be handled manually for read thread to wake up. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1588>
88 lines
2.8 KiB
C
88 lines
2.8 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_SRC_H__
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#define __GST_WASAPI_SRC_H__
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#include "gstwasapiutil.h"
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G_BEGIN_DECLS
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#define GST_TYPE_WASAPI_SRC \
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(gst_wasapi_src_get_type ())
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#define GST_WASAPI_SRC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_WASAPI_SRC, GstWasapiSrc))
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#define GST_WASAPI_SRC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_WASAPI_SRC, GstWasapiSrcClass))
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#define GST_IS_WASAPI_SRC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_WASAPI_SRC))
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#define GST_IS_WASAPI_SRC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_WASAPI_SRC))
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typedef struct _GstWasapiSrc GstWasapiSrc;
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typedef struct _GstWasapiSrcClass GstWasapiSrcClass;
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struct _GstWasapiSrc
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{
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GstAudioSrc parent;
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IMMDevice *device;
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IAudioClient *client;
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IAudioClock *client_clock;
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guint64 client_clock_freq;
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IAudioCaptureClient *capture_client;
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HANDLE event_handle;
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HANDLE cancellable;
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/* Smooth frames captured from WASAPI, which can be irregular sometimes */
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GstAdapter *adapter;
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/* Client was reset, so it needs to be started again */
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gboolean client_needs_restart;
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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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/* The channel positions in the data read from the device
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* we will pass this to GstAudioRingbuffer so it can
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* translate it to the native GStreamer channel layout. */
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GstAudioChannelPosition *positions;
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/* Used for loopback use case in order to keep feeding silence into client */
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IAudioClient *loopback_client;
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IAudioRenderClient *loopback_render_client;
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GThread *loopback_thread;
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HANDLE loopback_event_handle;
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HANDLE loopback_cancellable;
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/* properties */
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gint role;
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gint sharemode;
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gboolean loopback;
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gboolean low_latency;
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gboolean try_audioclient3;
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wchar_t *device_strid;
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};
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struct _GstWasapiSrcClass
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{
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GstAudioSrcClass parent_class;
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};
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GType gst_wasapi_src_get_type (void);
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G_END_DECLS
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#endif /* __GST_WASAPI_SRC_H__ */
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