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6cbff552fe
Some audio drivers return varying amounts of data per ::GetBuffer call, instead of following the device period that they've told us about in `src_prepare()`. Previously, we would just drop those extra buffers hoping that the extra buffers were temporary (f.ex., a startup 'burst' of audio data). However, it seems that some audio drivers, particularly on older Windows versions (such as Windows 10 1703 and older) consistently return varying amounts of data. Use GstAdapter to smooth that out, and hope that the audio driver is locally varying but globally periodic. Initially reported in https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/issues/808
80 lines
2.5 KiB
C
80 lines
2.5 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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/* 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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/* 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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