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1cee559351
Implement essential initialization of the sound driver: - introduce required data structures - handle driver registration - handle sound card registration - register sound driver on backend connection - remove sound driver on backend disconnect Initialize virtual sound card with streams according to the Xen store configuration. Implement ALSA driver operations including: - manage frontend/backend shared buffers - manage Xen bus event channel states Implement requests from front to back for ALSA PCM operations. - report ALSA period elapsed event: handle XENSND_EVT_CUR_POS notifications from the backend when stream position advances during playback/capture. The event carries a value of how many octets were played/captured at the time of the event. - implement explicit stream parameter negotiation between backend and frontend: handle XENSND_OP_HW_PARAM_QUERY request to read/update configuration space for the parameter given: request passes desired parameter interval and the response to this request returns min/max interval for the parameter to be used. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
24 lines
581 B
C
24 lines
581 B
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/*
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* Xen para-virtual sound device
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*
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* Copyright (C) 2016-2018 EPAM Systems Inc.
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*
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* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
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*/
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#ifndef __XEN_SND_FRONT_ALSA_H
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#define __XEN_SND_FRONT_ALSA_H
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struct xen_snd_front_info;
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int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info);
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void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info);
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void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl,
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u64 pos_bytes);
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#endif /* __XEN_SND_FRONT_ALSA_H */
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