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1a8610f8f8
Earlier, the plugin was ignoring those settings and blindly setting buffer-time to 2 seconds and latency-time to 200ms, which forced all pipelines to have a minimum latency of 200ms + sink latency. The values of segsize and segtotal were also not derived correctly. Now we obey these values, and you can get close to the previous behaviour by setting buffer-time and latency-time manually. Note that they are set in microseconds. As a consequence, when we haven't received enough data from the device, we now sleep for a time proportional to the data remaining. However, Directsound is a deprecated API so it maintains its own software ringbuffer which updates at arbitrary intervals. Hence we might have to wait a full segsize to get the last 10% of data. To avoid tight loops, we clamp our sleep floor at 10ms. In my testing, this keeps the wakeups not-too-high (proportional to the latency-time set on the source). Further improvements should be made by fixing the WASAPI audio source plugin instead of this. Directsound is deprecated and as the comments explain, it is impossible to get low latency, decent quality, or good performance from it. Based on a patch by Sebastian Dröge <sebastian@centricular.com> https://bugzilla.gnome.org/show_bug.cgi?id=781249
118 lines
4 KiB
C
118 lines
4 KiB
C
/*
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* GStreamer
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* Copyright 2005 Thomas Vander Stichele <thomas@apestaart.org>
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* Copyright 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* Copyright 2005 Sébastien Moutte <sebastien@moutte.net>
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* Copyright 2006 Joni Valtanen <joni.valtanen@movial.fi>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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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_DIRECTSOUNDSRC_H__
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#define __GST_DIRECTSOUNDSRC_H__
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#include <gst/gst.h>
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#include <gst/audio/audio.h>
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#include <gst/audio/gstaudiosrc.h>
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#include <windows.h>
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#include <dsound.h>
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#include <mmsystem.h>
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/* add here some headers if needed */
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G_BEGIN_DECLS
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/* #defines don't like whitespacey bits */
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#define GST_TYPE_DIRECTSOUND_SRC (gst_directsound_src_get_type())
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#define GST_DIRECTSOUND_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DIRECTSOUND_SRC,GstDirectSoundSrc))
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#define GST_DIRECTSOUND_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DIRECTSOUND_SRC,GstDirectSoundSrcClass))
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#define GST_IS_DIRECTSOUND_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DIRECTSOUND_SRC))
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#define GST_IS_DIRECTSOUND_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DIRECTSOUND_SRC))
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typedef struct _GstDirectSoundSrc GstDirectSoundSrc;
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typedef struct _GstDirectSoundSrcClass GstDirectSoundSrcClass;
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#define GST_DSOUND_LOCK(obj) (g_mutex_lock (&obj->dsound_lock))
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#define GST_DSOUND_UNLOCK(obj) (g_mutex_unlock (&obj->dsound_lock))
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struct _GstDirectSoundSrc
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{
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GstAudioSrc src;
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HINSTANCE DSoundDLL; /* DLL instance */
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LPDIRECTSOUNDCAPTURE pDSC; /* DirectSoundCapture*/
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LPDIRECTSOUNDCAPTUREBUFFER pDSBSecondary; /*Secondaty capturebuffer*/
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DWORD current_circular_offset;
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guint buffer_size;
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guint bytes_per_sample;
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guint latency_time;
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HMIXER mixer;
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DWORD mixerline_cchannels;
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gint control_id_volume;
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gint control_id_mute;
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glong dw_vol_max;
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glong dw_vol_min;
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glong volume;
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gboolean mute;
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GUID *device_guid;
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char *device_name;
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char *device_id;
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GMutex dsound_lock;
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};
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struct _GstDirectSoundSrcClass
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{
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GstAudioSrcClass parent_class;
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};
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GType gst_directsound_src_get_type (void);
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G_END_DECLS
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#endif /* __GST_DIRECTSOUNDSRC_H__ */
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