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v4l2: set latency on port

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Use the duration of one frame as the latency.

See #3910
This commit is contained in:
Wim Taymans 2024-03-22 11:15:10 +01:00
parent 3ddd171567
commit 30f01b117e
2 changed files with 15 additions and 9 deletions
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9
spa/plugins/v4l2/v4l2-source.c
View file

@ -82,7 +82,6 @@ struct port {
bool have_format;
struct spa_video_info current_format;
struct spa_fraction rate;
struct spa_v4l2_device dev;
@ -696,11 +695,19 @@ static int port_set_format(struct impl *this, struct port *port,
done:
this->info.change_mask |= SPA_NODE_CHANGE_MASK_PARAMS;
port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
port->params[PORT_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
if (port->have_format) {
uint64_t latency;
latency = port->info.rate.num * SPA_NSEC_PER_SEC / port->info.rate.denom;
this->latency[SPA_DIRECTION_OUTPUT] =
SPA_LATENCY_INFO(SPA_DIRECTION_OUTPUT,
.min_ns = latency,
.max_ns = latency);
port->params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
port->params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
this->params[NODE_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READ);
} else {
this->latency[SPA_DIRECTION_OUTPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_OUTPUT);
port->params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
port->params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
this->params[NODE_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, 0);