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alsa: hook up latencyOffsetNsec in ALSA sink/source

Browse source 
This property is exposed on the device Route and forwarded to the
nodes. It then configured the process_latency.ns field, which
influences the reported port latency.

This makes it possible to change the internal port latency on the
sink and source with pavucontrol and tweak the synchronization to
compensate for internal latencies in the device.
This commit is contained in:
Wim Taymans 2021-08-17 11:57:12 +02:00
parent 391465d1cd
commit c39d374ca8
4 changed files with 125 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

49
spa/plugins/alsa/alsa-pcm-source.c
View file

@ -161,6 +161,13 @@ static int impl_node_enum_params(void *object, int seq,
SPA_PROP_INFO_name, SPA_POD_String("Use the driver channelmap"),
SPA_PROP_INFO_type, SPA_POD_Bool(p->use_chmap));
break;
case 6:
param = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_PropInfo, id,
SPA_PROP_INFO_id, SPA_POD_Id(SPA_PROP_latencyOffsetNsec),
SPA_PROP_INFO_name, SPA_POD_String("Latency offset (ns)"),
SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Long(0, 0, INT64_MAX));
break;
default:
return 0;
}
@ -176,7 +183,8 @@ static int impl_node_enum_params(void *object, int seq,
SPA_PROP_cardName, SPA_POD_Stringn(p->card_name, sizeof(p->card_name)),
SPA_PROP_minLatency, SPA_POD_Int(p->min_latency),
SPA_PROP_maxLatency, SPA_POD_Int(p->max_latency),
SPA_PROP_START_CUSTOM, SPA_POD_Bool(p->use_chmap));
SPA_PROP_START_CUSTOM, SPA_POD_Bool(p->use_chmap),
SPA_PROP_latencyOffsetNsec, SPA_POD_Long(this->process_latency.ns));
break;
default:
return 0;
@ -249,6 +257,29 @@ static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
return 0;
}
static void handle_process_latency(struct state *this,
const struct spa_process_latency_info *info)
{
bool ns_changed = this->process_latency.ns != info->ns;
if (this->process_latency.quantum == info->quantum &&
this->process_latency.rate == info->rate &&
!ns_changed)
return;
this->process_latency = *info;
this->info.change_mask |= SPA_NODE_CHANGE_MASK_PARAMS;
if (ns_changed)
this->params[NODE_Props].flags ^= SPA_PARAM_INFO_SERIAL;
this->params[NODE_ProcessLatency].flags ^= SPA_PARAM_INFO_SERIAL;
emit_node_info(this, false);
this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
this->port_params[PORT_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
emit_port_info(this, false);
}
static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
const struct spa_pod *param)
{
@ -261,17 +292,24 @@ static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
case SPA_PARAM_Props:
{
struct props *p = &this->props;
struct spa_process_latency_info info;
if (param == NULL) {
reset_props(p);
return 0;
}
info = this->process_latency;
spa_pod_parse_object(param,
SPA_TYPE_OBJECT_Props, NULL,
SPA_PROP_device, SPA_POD_OPT_Stringn(p->device, sizeof(p->device)),
SPA_PROP_minLatency, SPA_POD_OPT_Int(&p->min_latency),
SPA_PROP_maxLatency, SPA_POD_OPT_Int(&p->max_latency),
SPA_PROP_latencyOffsetNsec, SPA_POD_OPT_Long(&info.ns),
SPA_PROP_START_CUSTOM, SPA_POD_OPT_Bool(&p->use_chmap));
handle_process_latency(this, &info);
break;
}
case SPA_PARAM_ProcessLatency:
@ -279,15 +317,8 @@ static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
struct spa_process_latency_info info;
if ((res = spa_process_latency_parse(param, &info)) < 0)
return res;
this->process_latency = info;
this->info.change_mask |= SPA_NODE_CHANGE_MASK_PARAMS;
this->params[NODE_ProcessLatency].flags ^= SPA_PARAM_INFO_SERIAL;
emit_node_info(this, false);
this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
this->port_params[PORT_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
emit_port_info(this, false);
handle_process_latency(this, &info);
break;
}
default: