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spa: alsa: Add a mechanism for external volume control

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Currently enabled at device creation and delegated to an external entity
via spa_device events.
This commit is contained in:
Julian Bouzas 2026-05-15 10:11:13 -04:00
parent 122bfd712b
commit ef6f5194e3
9 changed files with 867 additions and 86 deletions
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69
spa/plugins/alsa/acp/ext-volume.h Normal file
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/* External Volume Control */
/* SPDX-FileCopyrightText: Copyright © 2026 Arun Raghavan */
/* SPDX-FileCopyrightText: Copyright © 2026 Julian Bouzas */
/* SPDX-License-Identifier: MIT */
#ifndef ACP_EXT_VOLUME_H
#define ACP_EXT_VOLUME_H
#include <stdint.h>
#include <spa/param/audio/volume.h>
#include <spa/pod/event.h>
#define MAX_PORTS 256
typedef struct pa_cvolume pa_cvolume;
typedef void (*ext_volume_notifier_t) (void *data, struct spa_event *event);
struct caps_reply {
int res;
enum spa_audio_volume_control_flags caps;
};
struct mute_reply {
int res;
bool mute;
};
struct vols_reply {
int res;
uint32_t channels;
double values[SPA_AUDIO_MAX_CHANNELS];
};
struct spa_acp_ext_volume {
bool initialized;
enum spa_audio_volume_control_flags flags;
ext_volume_notifier_t notifier_cb;
void *notifier_data;
struct caps_reply caps_reply;
struct mute_reply mute_replies[MAX_PORTS];
struct vols_reply vols_replies[MAX_PORTS];
};
int spa_acp_ext_volume_init(struct spa_acp_ext_volume *ext_volume, const char *device,
ext_volume_notifier_t notifier_cb, void *notifier_data);
int spa_acp_ext_volume_read_volume(struct spa_acp_ext_volume *ext_volume,
const char *device, const char *port_name, uint32_t port_index, pa_cvolume *cvol);
int spa_acp_ext_volume_write_volume_absolute(struct spa_acp_ext_volume *ext_volume,
const char *device, const char *port_name, uint32_t port_index, pa_cvolume *cvol);
int spa_acp_ext_volume_write_volume_relative(struct spa_acp_ext_volume *ext_volume,
const char *device, const char *port_name, uint32_t port_index, float step);
int spa_acp_ext_volume_read_mute(struct spa_acp_ext_volume *ext_volume,
const char *device, const char *port_name, uint32_t port_index, bool *mute);
int spa_acp_ext_volume_write_mute_value(struct spa_acp_ext_volume *ext_volume,
const char *device, const char *port_name, uint32_t port_index, bool mute);
int spa_acp_ext_volume_write_mute_toggle(struct spa_acp_ext_volume *ext_volume,
const char *device, const char *port_name, uint32_t port_index);
#endif /* ACP_EXT_VOLUME_H */