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e1e60fdaa6
The target latency is now based upon the device maximum period size (which may be configured by setting the `PIPEWIRE_LATENCY` environment variable if using PipeWire), with some allowance for timing jitter from Spice and the audio device. PipeWire can change the period size dynamically at any time which must be taken into account when selecting the target latency to avoid underruns when the period size is increased. This is explained in detail within the commit body.
91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2022 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _H_I_AUDIODEV_
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#define _H_I_AUDIODEV_
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#include <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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typedef int (*LG_AudioPullFn)(uint8_t * dst, int frames);
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typedef void (*LG_AudioPushFn)(uint8_t * src, int frames);
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struct LG_AudioDevOps
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{
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/* internal name of the audio for debugging */
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const char * name;
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/* called very early to allow for option registration, optional */
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void (*earlyInit)(void);
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/* called to initialize the audio backend */
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bool (*init)(void);
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/* final free */
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void (*free)(void);
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struct
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{
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/* setup the stream for playback but don't start it yet
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* Note: the pull function returns f32 samples
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*/
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void (*setup)(int channels, int sampleRate, int * maxPeriodFrames,
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LG_AudioPullFn pullFn);
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/* called when there is data available to start playback
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* return true if playback should start */
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bool (*start)(int framesBuffered);
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/* called when SPICE reports the audio stream has stopped */
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void (*stop)(void);
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/* [optional] called to set the volume of the channels */
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void (*volume)(int channels, const uint16_t volume[]);
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/* [optional] called to set muting of the output */
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void (*mute)(bool mute);
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/* return the current total playback latency in microseconds */
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uint64_t (*latency)(void);
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}
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playback;
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struct
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{
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/* start the record stream
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* Note: currently SPICE only supports S16 samples so always assume so
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*/
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void (*start)(int channels, int sampleRate, LG_AudioPushFn pushFn);
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/* called when SPICE reports the audio stream has stopped */
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void (*stop)(void);
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/* [optional] called to set the volume of the channels */
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void (*volume)(int channels, const uint16_t volume[]);
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/* [optional] called to set muting of the input */
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void (*mute)(bool mute);
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}
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record;
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};
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#endif
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