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spa: libcamera: source: remove impl::pendingRequests

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The handling of `impl::pendingRequests` is a bit problematic because,
for example, during startup, if `spa_libcamera_buffer_recycle()` observes
that `impl::active == false`, then it will try to append to `impl::pendingRequests`,
which is being iterated in the main thread in `spa_libcamera_stream_on()`.
That is not allowed on an `std::deque`.

So instead remove it altogether, and simply queue all requests when starting.
After `libcamera::Camera::stop()` returns, every request is guaranteed not
to be used by libcamera, and they can be freely reused, so this is safe to do.

This also removes the need for calling `spa_libcamera_buffer_recycle()` when
the buffers are set/unset on a port since that function no longer changes
anything apart from updating `buffer::flags` but `spa_libcamera_alloc_buffers()`
is modified appropriately to take care of that. And in the case of
`spa_libcamera_clear_buffers()` clearing the flag is not required because the
next `spa_libcamera_alloc_buffers()` call will reset reset the flags.

(cherry picked from commit 68627c5563)
This commit is contained in:
Barnabás Pőcze 2025-08-07 15:47:02 +02:00 • committed by Robert Mader
parent ceb10964d3
commit c80af0c2c0
1 changed files with 7 additions and 22 deletions
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29
spa/plugins/libcamera/libcamera-source.cpp
View file

@ -6,7 +6,6 @@
#include <array>
#include <cstddef>
#include <deque>
#include <limits>
#include <optional>
#include <type_traits>
@ -156,7 +155,6 @@ struct impl {
FrameBufferAllocator *allocator = nullptr;
std::vector<std::unique_ptr<libcamera::Request>> requestPool;
std::deque<libcamera::Request *> pendingRequests;
void requestComplete(libcamera::Request *request);
@ -256,10 +254,7 @@ int spa_libcamera_buffer_recycle(struct impl *impl, struct port *port, uint32_t
return -EINVAL;
}
Request *request = impl->requestPool[buffer_id].get();
if (!impl->active) {
impl->pendingRequests.push_back(request);
return 0;
} else {
if (impl->active) {
request->controls().merge(impl->ctrls);
impl->ctrls.clear();
if ((res = impl->camera->queueRequest(request)) < 0) {
@ -358,10 +353,6 @@ int spa_libcamera_clear_buffers(struct impl *impl, struct port *port)
b = &port->buffers[i];
d = b->outbuf->datas;
if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_OUTSTANDING)) {
spa_log_debug(impl->log, "queueing outstanding buffer %p", b);
spa_libcamera_buffer_recycle(impl, port, i);
}
if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_MAPPED)) {
munmap(SPA_PTROFF(b->ptr, -d[0].mapoffset, void),
d[0].maxsize - d[0].mapoffset);
@ -370,7 +361,6 @@ int spa_libcamera_clear_buffers(struct impl *impl, struct port *port)
d[0].type = SPA_ID_INVALID;
}
impl->pendingRequests.clear();
port->n_buffers = 0;
port->ring = SPA_RINGBUFFER_INIT();
@ -1149,7 +1139,7 @@ spa_libcamera_alloc_buffers(struct impl *impl, struct port *port,
b = &port->buffers[i];
b->id = i;
b->outbuf = buffers[i];
b->flags = BUFFER_FLAG_OUTSTANDING;
b->flags = 0;
b->h = (struct spa_meta_header*)spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
b->videotransform = (struct spa_meta_videotransform*)spa_buffer_find_meta_data(
@ -1222,8 +1212,6 @@ spa_libcamera_alloc_buffers(struct impl *impl, struct port *port,
return -EIO;
}
}
spa_libcamera_buffer_recycle(impl, port, i);
}
port->n_buffers = n_buffers;
@ -1351,11 +1339,12 @@ int spa_libcamera_stream_on(struct impl *impl)
impl->camera->requestCompleted.connect(impl, &impl::requestComplete);
for (Request *req : impl->pendingRequests) {
if ((res = impl->camera->queueRequest(req)) < 0)
for (auto& req : impl->requestPool) {
req->reuse(libcamera::Request::ReuseFlag::ReuseBuffers);
if ((res = impl->camera->queueRequest(req.get())) < 0)
goto err_stop_camera;
}
impl->pendingRequests.clear();
impl->dll.bw = 0.0;
impl->active = true;
@ -1378,15 +1367,11 @@ int spa_libcamera_stream_off(struct impl *impl)
struct port *port = &impl->out_ports[0];
int res;
if (!impl->active) {
for (std::unique_ptr<Request> &req : impl->requestPool)
req->reuse(libcamera::Request::ReuseFlag::ReuseBuffers);
if (!impl->active)
return 0;
}
impl->active = false;
spa_log_info(impl->log, "stopping camera %s", impl->camera->id().c_str());
impl->pendingRequests.clear();
if ((res = impl->camera->stop()) < 0) {
spa_log_warn(impl->log, "error stopping camera %s: %s",