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alsa: adjust latency based on buffer size

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This commit is contained in:
Wim Taymans 2018-04-30 09:27:20 +02:00
parent d5e658e8f9
commit b8a37381da
3 changed files with 27 additions and 10 deletions
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27
spa/plugins/alsa/alsa-source.c
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@ -34,12 +34,14 @@
#define CHECK_PORT(this,d,p) ((d) == SPA_DIRECTION_OUTPUT && (p) == 0)
static const char default_device[] = "hw:0";
static const uint32_t default_min_latency = 1024;
static const uint32_t default_min_latency = 64;
static const uint32_t default_max_latency = 1024;
static void reset_props(struct props *props)
{
strncpy(props->device, default_device, 64);
props->min_latency = default_min_latency;
props->max_latency = default_max_latency;
}
static int impl_node_enum_params(struct spa_node *node,
@ -108,6 +110,14 @@ static int impl_node_enum_params(struct spa_node *node,
":", t->param.propType, "ir", p->min_latency,
SPA_POD_PROP_MIN_MAX(1, INT32_MAX));
break;
case 4:
param = spa_pod_builder_object(&b,
id, t->param.PropInfo,
":", t->param.propId, "I", t->prop_max_latency,
":", t->param.propName, "s", "The maximum latency",
":", t->param.propType, "ir", p->max_latency,
SPA_POD_PROP_MIN_MAX(1, INT32_MAX));
break;
default:
return 0;
}
@ -120,7 +130,8 @@ static int impl_node_enum_params(struct spa_node *node,
":", t->prop_device, "S", p->device, sizeof(p->device),
":", t->prop_device_name, "S-r", p->device_name, sizeof(p->device_name),
":", t->prop_card_name, "S-r", p->card_name, sizeof(p->card_name),
":", t->prop_min_latency, "i", p->min_latency);
":", t->prop_min_latency, "i", p->min_latency,
":", t->prop_max_latency, "i", p->max_latency);
break;
default:
return 0;
@ -157,7 +168,8 @@ static int impl_node_set_param(struct spa_node *node, uint32_t id, uint32_t flag
}
spa_pod_object_parse(param,
":", t->prop_device, "?S", p->device, sizeof(p->device),
":", t->prop_min_latency, "?i", &p->min_latency, NULL);
":", t->prop_min_latency, "?i", &p->min_latency,
":", t->prop_max_latency, "?i", &p->max_latency, NULL);
}
else
return -ENOENT;
@ -365,8 +377,11 @@ impl_node_port_enum_params(struct spa_node *node,
param = spa_pod_builder_object(&b,
id, t->param_buffers.Buffers,
":", t->param_buffers.size, "i", this->props.min_latency * this->frame_size,
":", t->param_buffers.stride, "i", 0,
":", t->param_buffers.size, "iru", this->props.max_latency *
this->frame_size,
SPA_POD_PROP_MIN_MAX(this->props.min_latency * this->frame_size,
INT32_MAX),
":", t->param_buffers.stride, "i", this->frame_size,
":", t->param_buffers.buffers, "ir", 2,
SPA_POD_PROP_MIN_MAX(1, MAX_BUFFERS),
":", t->param_buffers.align, "i", 16);
@ -509,6 +524,8 @@ impl_node_port_use_buffers(struct spa_node *node,
return -EINVAL;
}
spa_list_append(&this->free, &b->link);
this->threshold = d[0].maxsize / this->frame_size;
}
this->n_buffers = n_buffers;