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v4l2: use dll to track rate difference

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Track the difference between the configured and real framerate and use
that as the rate correction to adjust the next_nsec clock field.
This commit is contained in:
Wim Taymans 2024-11-26 17:14:26 +01:00
parent 043245ca11
commit 41e35c7b17
5 changed files with 40 additions and 5 deletions
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3
spa/plugins/libcamera/libcamera-source.cpp
View file

@ -19,6 +19,7 @@
#include <spa/utils/result.h>
#include <spa/utils/string.h>
#include <spa/utils/ringbuffer.h>
#include <spa/utils/dll.h>
#include <spa/monitor/device.h>
#include <spa/node/node.h>
#include <spa/node/io.h>
@ -167,6 +168,8 @@ struct impl {
impl(spa_log *log, spa_loop *data_loop, spa_system *system,
std::shared_ptr<CameraManager> manager, std::shared_ptr<Camera> camera, std::string device_id);
struct spa_dll dll;
};
}

18
spa/plugins/libcamera/libcamera-utils.cpp
View file

@ -931,6 +931,18 @@ void impl::requestComplete(libcamera::Request *request)
const FrameMetadata &fmd = buffer->metadata();
if (impl->clock) {
double target = (double)port->info.rate.num / port->info.rate.denom;
double corr;
if (impl->dll.bw == 0.0) {
spa_dll_set_bw(&impl->dll, SPA_DLL_BW_MAX, port->info.rate.denom, port->info.rate.denom);
impl->clock->next_nsec = fmd.timestamp;
corr = 1.0;
} else {
double diff = ((double)impl->clock->next_nsec - (double)fmd.timestamp) / SPA_NSEC_PER_SEC;
double error = port->info.rate.denom * (diff - target);
corr = spa_dll_update(&impl->dll, SPA_CLAMPD(error, -128., 128.));
}
/* FIXME, we should follow the driver clock and target_ values.
* for now we ignore and use our own. */
impl->clock->target_rate = port->rate;
@ -941,8 +953,8 @@ void impl::requestComplete(libcamera::Request *request)
impl->clock->position = fmd.sequence;
impl->clock->duration = 1;
impl->clock->delay = 0;
impl->clock->rate_diff = 1.0;
impl->clock->next_nsec = fmd.timestamp;
impl->clock->rate_diff = corr;
impl->clock->next_nsec += (uint64_t) (target * SPA_NSEC_PER_SEC * corr);
}
if (b->h) {
b->h->flags = 0;
@ -987,6 +999,8 @@ static int spa_libcamera_stream_on(struct impl *impl)
}
impl->pendingRequests.clear();
impl->dll.bw = 0.0;
impl->source.func = libcamera_on_fd_events;
impl->source.data = impl;
impl->source.fd = spa_system_eventfd_create(impl->system, SPA_FD_CLOEXEC | SPA_FD_NONBLOCK);