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Route audio through a provider interface. Connected transports take priority while SPICE remains the fallback. Carry explicit sample formats, rates, channel layouts, and source clocks through playback and recording. Add optional presentation clock feedback for active synchronization.
98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2026 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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#include "interface/audio.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, returning false
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* if the stream could not be configured. If backend resampling is
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* requested, resamplerEnabled reports whether it was activated for this
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* stream.
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* Note: the pull function returns f32 samples
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*/
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bool (*setup)(const LG_AudioFormat * format, int requestedPeriodFrames,
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bool requestResampler, bool * resamplerEnabled,
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int * maxPeriodFrames, int * startFrames, LG_AudioPullFn pullFn);
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/* called when there is data available to start playback */
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void (*start)(void);
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/* called when the source 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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/* [optional] update the active backend resampler's output/input ratio.
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* Called from the backend's playback callback and must be realtime safe. */
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bool (*setRate)(double ratio);
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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 using the requested interleaved format */
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void (*start)(const LG_AudioFormat * format, LG_AudioPushFn pushFn);
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/* called when the source 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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