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authorScott Murray <scott.murray@konsulko.com>2022-06-17 20:24:27 -0400
committerScott Murray <scott.murray@konsulko.com>2022-07-04 22:29:37 +0000
commit509105d48cd1524cba1f20c4e0641d8c2d3a9cb4 (patch)
treec9739f3e7bc741efb8c2760bf0dc917e920f5824 /binding/audiomixer-binding.c
parentdadd3d771d5b27a455afffed8437c0a2e6db26b2 (diff)
Repurpose repository for a spiritual successor of the previous binding. The replacement is a daemon that demonstrates servicing the volume actuator from the VSS schema via VIS signals from KUKSA.val. Currently the connection to KUKSA.val is websocket based using the boost::asio framework, but the plan is to migrate to gRPC as that becomes more robust in KUKSA.val. As well, this new code will serve as the base for implementing a gRPC API to expose the full set of WirePlumber controls as was done with the previous binding. Notable changes: - New code is completely C++, partly to leverage using Boost, but also to futureproof future work with gRPC. The WirePlumber interfacing code that has been kept from the old binding is still C for now, converting it to C++ is a planned future rework. - Switch from CMake to meson for ease of development and some degree of futureproofing. - Use with systemd is assumed; behavior follows the systemd daemon guidelines barring the use of journald logging prefixes, which may be addressed with future work. A systemd unit is also installed as part of the build. - SPDX license headers using SPDX "short identifiers" are used in source files rather than the full copyright headers used in the previous codebase. This follows the direction that projects such as the Linux kernel are going in. Bug-AGL: SPEC-4409 Signed-off-by: Scott Murray <scott.murray@konsulko.com> Change-Id: Ibb7091c4354432bb094147d1419ab475486a4abc (cherry picked from commit 298bbf445a731b85cb8d5d19a3b595e8870d8701)
Diffstat (limited to 'binding/audiomixer-binding.c')
-rw-r--r--binding/audiomixer-binding.c402
1 files changed, 0 insertions, 402 deletions
diff --git a/binding/audiomixer-binding.c b/binding/audiomixer-binding.c
deleted file mode 100644
index 2c8981a..0000000
--- a/binding/audiomixer-binding.c
+++ /dev/null
@@ -1,402 +0,0 @@
-/*
- * Copyright © 2019 Collabora Ltd.
- * Copyright © 2019 Konsulko Group
- * @author George Kiagiadakis <george.kiagiadakis@collabora.com>
- *
- * SPDX-License-Identifier: MIT
- */
-
-#include <string.h>
-#include <json-c/json.h>
-#include <afb/afb-binding.h>
-#include <systemd/sd-event.h>
-#include "audiomixer.h"
-
-static struct audiomixer *audiomixer;
-static afb_event_t controls_changed;
-static afb_event_t volume_changed;
-static afb_event_t mute_changed;
-
-static const char *signalcomposer_events[] = {
- "event.volume.up",
- "event.volume.down",
- "event.volume.mute",
- NULL,
-};
-
-static void
-audiomixer_controls_changed_deferred(int signum, void *arg)
-{
- AFB_DEBUG("controls changed");
- afb_event_push(controls_changed, NULL);
-}
-
-struct value_changed_data
-{
- unsigned int change_mask;
- struct mixer_control control;
-};
-
-static void
-audiomixer_value_changed_deferred(int signum, void *data)
-{
- struct value_changed_data *d = data;
- json_object *json;
-
- AFB_DEBUG("value changed");
-
- json = json_object_new_object();
- json_object_object_add(json, "control",
- json_object_new_string(d->control.name));
-
- if (d->change_mask & MIXER_CONTROL_CHANGE_FLAG_VOLUME) {
- json_object_object_add(json, "value",
- json_object_new_double(d->control.volume));
- afb_event_push(volume_changed, json);
- } else if (d->change_mask & MIXER_CONTROL_CHANGE_FLAG_MUTE) {
- json_object_object_add(json, "value",
- json_object_new_int(d->control.mute));
- afb_event_push(mute_changed, json);
- }
-
- free(d);
-}
-
-/* called in audiomixer's thread */
-static void
-audiomixer_controls_changed(void *data)
-{
- afb_api_t api = data;
- afb_api_queue_job (api, audiomixer_controls_changed_deferred, NULL,
- (void *) 0x1, 0);
-}
-
-
-/* called in audiomixer's thread */
-static void
-audiomixer_value_changed(void *data,
- unsigned int change_mask,
- const struct mixer_control *control)
-{
- afb_api_t api = data;
- struct value_changed_data *d = calloc(1, sizeof(*d));
-
- d->change_mask = change_mask;
- d->control = *control;
-
- afb_api_queue_job (api, audiomixer_value_changed_deferred, d,
- (void *) 0x1, 0);
-}
-
-static const struct audiomixer_events audiomixer_events = {
- .controls_changed = audiomixer_controls_changed,
- .value_changed = audiomixer_value_changed,
-};
-
-static int
-cleanup(sd_event_source *s, void *data)
-{
- audiomixer_free(audiomixer);
- audiomixer = NULL;
- return 0;
-}
-
-static int
-init(afb_api_t api)
-{
- int ret;
-
- ret = afb_daemon_require_api("signal-composer", 1);
- if (ret) {
- AFB_WARNING("unable to initialize signal-composer binding");
- } else {
- const char **tmp = signalcomposer_events;
- json_object *args = json_object_new_object();
- json_object *signals = json_object_new_array();
-
- while (*tmp) {
- json_object_array_add(signals, json_object_new_string(*tmp++));
- }
- json_object_object_add(args, "signal", signals);
- if(json_object_array_length(signals)) {
- afb_api_call_sync(api, "signal-composer", "subscribe",
- args, NULL, NULL, NULL);
- } else {
- json_object_put(args);
- }
- }
-
- sd_event *e = afb_daemon_get_event_loop();
-
- controls_changed = afb_api_make_event(api, "controls_changed");
- volume_changed = afb_api_make_event(api, "volume_changed");
- mute_changed = afb_api_make_event(api, "mute_changed");
-
- audiomixer = audiomixer_new();
- sd_event_add_exit(e, NULL, cleanup, NULL);
-
- audiomixer_add_event_listener(audiomixer, &audiomixer_events, api);
-
- return 0;
-}
-
-static void
-list_controls_cb(afb_req_t request)
-{
- json_object *ret_json, *nest_json;
- const struct mixer_control **ctls;
- unsigned int n_controls, i;
-
- audiomixer_lock(audiomixer);
-
- if (audiomixer_ensure_controls(audiomixer, 3) < 0) {
- AFB_REQ_NOTICE(request, "No mixer controls were exposed "
- "in PipeWire after 3 seconds");
- }
-
- ctls = audiomixer_get_active_controls(audiomixer, &n_controls);
-
- ret_json = json_object_new_array();
- for (i = 0; i < n_controls; i++) {
- nest_json = json_object_new_object();
- json_object_object_add(nest_json, "control",
- json_object_new_string(ctls[i]->name));
- json_object_object_add(nest_json, "volume",
- json_object_new_double(ctls[i]->volume));
- json_object_object_add(nest_json, "mute",
- json_object_new_int(ctls[i]->mute));
- json_object_array_add(ret_json, nest_json);
- }
- afb_req_success(request, ret_json, NULL);
-
- audiomixer_unlock(audiomixer);
-}
-
-static void
-volume_cb(afb_req_t request)
-{
- json_object *ret_json;
- const char *control = afb_req_value(request, "control");
- const char *value = afb_req_value(request, "value");
- const struct mixer_control *ctl;
- double volume;
-
- audiomixer_lock(audiomixer);
-
- if (!control) {
- afb_req_fail(request, "failed",
- "Invalid arguments: missing 'control'");
- goto unlock;
- }
-
- if (audiomixer_ensure_controls(audiomixer, 3) < 0) {
- AFB_REQ_NOTICE(request, "No mixer controls were exposed "
- "in PipeWire after 3 seconds");
- }
-
- ctl = audiomixer_find_control(audiomixer, control);
- if (!ctl) {
- afb_req_fail(request, "failed", "Could not find control");
- goto unlock;
- }
-
- if(value) {
- char *endptr;
- volume = strtod(value, &endptr);
- if (endptr == value || volume < -0.00001 || volume > 1.00001) {
- afb_req_fail(request, "failed",
- "Invalid volume value (must be between 0.0 and 1.0)");
- goto unlock;
- }
-
- audiomixer_change_volume(audiomixer, ctl, volume);
- } else {
- volume = ctl->volume;
- }
-
- ret_json = json_object_new_object();
- json_object_object_add(ret_json, "volume", json_object_new_double(volume));
- afb_req_success(request, ret_json, NULL);
-
-unlock:
- audiomixer_unlock(audiomixer);
-}
-
-static void
-mute_cb(afb_req_t request)
-{
- json_object *ret_json;
- const char *control = afb_req_value(request, "control");
- const char *value = afb_req_value(request, "value");
- const struct mixer_control *ctl;
- int mute;
-
- audiomixer_lock(audiomixer);
-
- if (!control) {
- afb_req_fail(request, "failed",
- "Invalid arguments: missing 'control'");
- goto unlock;
- }
-
- if (audiomixer_ensure_controls(audiomixer, 3) < 0) {
- AFB_REQ_NOTICE(request, "No mixer controls were exposed "
- "in PipeWire after 3 seconds");
- }
-
- ctl = audiomixer_find_control(audiomixer, control);
- if (!ctl) {
- afb_req_fail(request, "failed", "Could not find control");
- goto unlock;
- }
-
- if(value) {
- char *endptr;
- mute = (int) strtol(value, &endptr, 10);
- if (endptr == value || mute < 0 || mute > 1) {
- afb_req_fail(request, "failed",
- "Invalid mute value (must be integer 0 or 1)");
- goto unlock;
- }
-
- audiomixer_change_mute(audiomixer, ctl, mute);
- } else {
- mute = ctl->mute;
- }
-
- ret_json = json_object_new_object();
- json_object_object_add(ret_json, "mute", json_object_new_int(mute));
- afb_req_success(request, ret_json, NULL);
-
-unlock:
- audiomixer_unlock(audiomixer);
-}
-
-static void
-subscribe_cb(afb_req_t request)
-{
- const char *eventstr = afb_req_value(request, "event");
- afb_event_t event;
-
- if (!eventstr) {
- afb_req_fail(request, "failed",
- "Invalid arguments: missing 'event'");
- return;
- }
-
- if (!strcmp(eventstr, "controls_changed"))
- event = controls_changed;
- else if (!strcmp(eventstr, "volume_changed"))
- event = volume_changed;
- else if (!strcmp(eventstr, "mute_changed"))
- event = mute_changed;
- else {
- afb_req_fail(request, "failed", "Invalid event name");
- return;
- }
-
- if (afb_req_subscribe(request, event) != 0)
- afb_req_fail(request, "failed", "Failed to subscribe to event");
- else
- afb_req_success(request, NULL, "Subscribed");
-}
-
-static void
-unsubscribe_cb(afb_req_t request)
-{
- const char *eventstr = afb_req_value(request, "event");
- afb_event_t event;
-
- if (!eventstr) {
- afb_req_fail(request, "failed",
- "Invalid arguments: missing 'event'");
- return;
- }
-
- if (!strcmp(eventstr, "controls_changed"))
- event = controls_changed;
- else if (!strcmp(eventstr, "volume_changed"))
- event = volume_changed;
- else if (!strcmp(eventstr, "mute_changed"))
- event = mute_changed;
- else {
- afb_req_fail(request, "failed", "Invalid event name");
- return;
- }
-
- if (afb_req_unsubscribe(request, event) != 0)
- afb_req_fail(request, "failed", "Failed to unsubscribe from event");
- else
- afb_req_success(request, NULL, "Unsubscribed");
-}
-
-static void
-onevent(afb_api_t api, const char *event, struct json_object *object)
-{
- const struct mixer_control *ctl;
- json_object *tmp = NULL;
- const char *uid;
- const char *value;
-
- json_object_object_get_ex(object, "uid", &tmp);
- if (tmp == NULL)
- return;
-
- uid = json_object_get_string(tmp);
- if (strncmp(uid, "event.volume.", 13))
- return;
-
- json_object_object_get_ex(object, "value", &tmp);
- if (tmp == NULL)
- return;
-
- value = json_object_get_string(tmp);
- if (strncmp(value, "true", 4))
- return;
-
- audiomixer_lock(audiomixer);
-
- ctl = audiomixer_find_control(audiomixer, "Master Playback");
- if (!ctl)
- goto unlock;
-
- if (!strcmp(uid, "event.volume.mute")) {
- audiomixer_change_mute(audiomixer, ctl, !ctl->mute);
- } else {
- double volume = ctl->volume;
-
- if (!strcmp(uid, "event.volume.up")) {
- volume += 0.05; // up 5%
- if (volume > 1.0)
- volume = 1.0; // clamp to 100%
- } else if (!strcmp(uid, "event.volume.down")) {
- volume -= 0.05; // down 5%
- if (volume < 0.0)
- volume = 0.0; // clamp to 0%
- } else {
- AFB_WARNING("Unhandled signal-composer uid '%s'", uid);
- goto unlock;
- }
- audiomixer_change_volume(audiomixer, ctl, volume);
- }
-
-unlock:
- audiomixer_unlock(audiomixer);
-}
-
-static const afb_verb_t verbs[]= {
- { .verb = "list_controls", .callback = list_controls_cb, .info = "List the available controls" },
- { .verb = "volume", .callback = volume_cb, .info = "Get/Set volume" },
- { .verb = "mute", .callback = mute_cb, .info = "Get/Set mute" },
- { .verb = "subscribe", .callback = subscribe_cb, .info = "Subscribe to mixer events" },
- { .verb = "unsubscribe", .callback = unsubscribe_cb, .info = "Unsubscribe from mixer events" },
- { }
-};
-
-const afb_binding_t afbBindingV3 = {
- .api = "audiomixer",
- .specification = "AudioMixer API",
- .verbs = verbs,
- .onevent = onevent,
- .init = init,
-};