mirror of
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99 lines
3.1 KiB
C
99 lines
3.1 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. The pull function returns the
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* exact interleaved format supplied here. 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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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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* The backend replaces ratio with the value it selected for the next
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* pull. Called from the backend's playback callback and must be realtime
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* 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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