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module-loopback: support latencyOffsetNsec Prop

Browse source 
Add support for latencyOffsetNsec Prop, which just controls the nsec
part of the ProcessLatency.

This is needed to support latency offset in Pulseaudio apps when using
loopbacks as front-end nodes to underlying sinks.
This commit is contained in:
Pauli Virtanen 2024-12-15 19:27:29 +02:00 • committed by P V
parent c556cced91
commit e4ff13a75d
1 changed files with 51 additions and 7 deletions
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58
src/modules/module-loopback.c
View file

@ -423,6 +423,16 @@ static void build_latency_params(struct impl *impl, struct spa_pod_builder *b,
params[1] = spa_latency_build(b, SPA_PARAM_Latency, &latency);
}
static struct spa_pod *build_props(struct impl *impl, struct spa_pod_builder *b,
enum spa_direction direction)
{
int64_t nsec = impl->process_latency[direction].ns;
return spa_pod_builder_add_object(b,
SPA_TYPE_OBJECT_Props, SPA_PARAM_Props,
SPA_PROP_latencyOffsetNsec, SPA_POD_Long(nsec));
}
static void param_latency_changed(struct impl *impl, const struct spa_pod *param,
struct pw_stream *stream, struct pw_stream *other)
{
@ -445,13 +455,28 @@ static void param_latency_changed(struct impl *impl, const struct spa_pod *param
impl->recalc_delay = true;
}
static void emit_process_latency_changed(struct impl *impl,
enum spa_direction direction, struct pw_stream *stream)
{
uint8_t buffer[4096];
struct spa_pod_builder b;
const struct spa_pod *params[4];
spa_pod_builder_init(&b, buffer, sizeof(buffer));
params[0] = spa_process_latency_build(&b, SPA_PARAM_ProcessLatency,
&impl->process_latency[direction]);
if (stream == impl->capture)
params[1] = build_props(impl, &b, SPA_DIRECTION_INPUT);
else
params[1] = build_props(impl, &b, SPA_DIRECTION_OUTPUT);
build_latency_params(impl, &b, &params[2], 2);
pw_stream_update_params(stream, params, 4);
}
static void param_process_latency_changed(struct impl *impl, const struct spa_pod *param,
enum spa_direction direction, struct pw_stream *stream)
{
struct spa_process_latency_info info;
uint8_t buffer[4096];
struct spa_pod_builder b;
const struct spa_pod *params[3];
if (param == NULL)
spa_zero(info);
@ -460,10 +485,23 @@ static void param_process_latency_changed(struct impl *impl, const struct spa_po
impl->process_latency[direction] = info;
spa_pod_builder_init(&b, buffer, sizeof(buffer));
params[0] = spa_process_latency_build(&b, SPA_PARAM_ProcessLatency, &info);
build_latency_params(impl, &b, &params[1], 2);
pw_stream_update_params(stream, params, 3);
emit_process_latency_changed(impl, direction, stream);
}
static void param_props_changed(struct impl *impl, const struct spa_pod *param,
enum spa_direction direction, struct pw_stream *stream)
{
int64_t nsec;
if (!param)
nsec = 0;
else if (spa_pod_parse_object(param,
SPA_TYPE_OBJECT_Props, NULL,
SPA_PROP_latencyOffsetNsec, SPA_POD_Long(&nsec)) < 0)
return;
impl->process_latency[direction].ns = nsec;
emit_process_latency_changed(impl, direction, stream);
}
static void param_tag_changed(struct impl *impl, const struct spa_pod *param,
@ -586,6 +624,9 @@ static void capture_param_changed(void *data, uint32_t id, const struct spa_pod
case SPA_PARAM_Latency:
param_latency_changed(impl, param, impl->capture, impl->playback);
break;
case SPA_PARAM_Props:
param_props_changed(impl, param, SPA_DIRECTION_INPUT, impl->capture);
break;
case SPA_PARAM_ProcessLatency:
param_process_latency_changed(impl, param, SPA_DIRECTION_INPUT, impl->capture);
break;
@ -634,6 +675,9 @@ static void playback_param_changed(void *data, uint32_t id, const struct spa_pod
case SPA_PARAM_Latency:
param_latency_changed(impl, param, impl->playback, impl->capture);
break;
case SPA_PARAM_Props:
param_props_changed(impl, param, SPA_DIRECTION_OUTPUT, impl->playback);
break;
case SPA_PARAM_ProcessLatency:
param_process_latency_changed(impl, param, SPA_DIRECTION_OUTPUT, impl->playback);
break;