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alsa: reconfigure max latency based on buffer size

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We can't ever support a latency larger than half the buffer size.
Take a fourth of the buffer size to have some extre headroom.

See #724
This commit is contained in:
Wim Taymans 2021-03-02 10:34:41 +01:00
parent 00d8d1472d
commit 1dfa36d77b
2 changed files with 32 additions and 13 deletions
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23
spa/plugins/alsa/alsa-pcm-source.c
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@ -271,18 +271,24 @@ static int impl_node_send_command(void *object, const struct spa_command *comman
return 0;
}
static const struct spa_dict_item node_info_items[] = {
{ SPA_KEY_DEVICE_API, "alsa" },
{ SPA_KEY_MEDIA_CLASS, "Audio/Source" },
{ SPA_KEY_NODE_DRIVER, "true" },
};
static void emit_node_info(struct state *this, bool full)
{
if (full)
this->info.change_mask = this->info_all;
if (this->info.change_mask) {
this->info.props = &SPA_DICT_INIT_ARRAY(node_info_items);
struct spa_dict_item items[4];
uint32_t n_items = 0;
char latency[64];
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_DEVICE_API, "alsa");
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_MEDIA_CLASS, "Audio/Source");
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_NODE_DRIVER, "true");
if (this->have_format) {
snprintf(latency, sizeof(latency), "%lu/%d", this->buffer_frames / 4, this->rate);
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_NODE_LATENCY, latency);
}
this->info.props = &SPA_DICT_INIT(items, n_items);
spa_node_emit_info(&this->hooks, &this->info);
this->info.change_mask = 0;
}
@ -505,6 +511,9 @@ static int port_set_format(void *object,
this->have_format = true;
}
this->info.change_mask |= SPA_NODE_CHANGE_MASK_PROPS;
emit_node_info(this, false);
this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_RATE;
this->port_info.rate = SPA_FRACTION(1, this->rate);
this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;