@@ -130,33 +130,39 @@ VirtualCameraData::VirtualCameraData(PipelineHandler *pipe,
void VirtualCameraData::processRequest(Request *request)
{
+ std::array<std::pair<StreamConfig *, FrameBuffer *>, kMaxStream> buffers;
+ size_t bufferCount = 0;
+
for (const auto &[stream, buffer] : request->buffers()) {
bool found = false;
- /* map buffer and fill test patterns */
for (auto &streamConfig : streamConfigs_) {
if (stream == &streamConfig.stream) {
- FrameMetadata &fmd = buffer->_d()->metadata();
-
- fmd.status = FrameMetadata::Status::FrameSuccess;
- fmd.sequence = streamConfig.seq++;
- fmd.timestamp = currentTimestamp();
-
- Span<const FrameBuffer::Plane> planes = buffer->planes();
- for (const auto [i, p] : utils::enumerate(planes))
- fmd.planes()[i].bytesused = p.length;
-
+ buffers[bufferCount++] = { &streamConfig, buffer };
found = true;
-
- if (streamConfig.frameGenerator->generateFrame(
- stream->configuration().size, buffer))
- fmd.status = FrameMetadata::Status::FrameError;
-
- bufferCompleted.emit(buffer);
break;
}
}
ASSERT(found);
}
+
+ for (size_t i = 0; i < bufferCount; i++) {
+ const auto &[stream, buffer] = buffers[i];
+ FrameMetadata &fmd = buffer->_d()->metadata();
+
+ fmd.status = FrameMetadata::Status::FrameSuccess;
+ fmd.sequence = stream->seq++;
+ fmd.timestamp = currentTimestamp();
+
+ Span<const FrameBuffer::Plane> planes = buffer->planes();
+ for (const auto [j, p] : utils::enumerate(planes))
+ fmd.planes()[j].bytesused = p.length;
+
+ if (stream->frameGenerator->generateFrame(stream->stream.configuration().size,
+ buffer))
+ fmd.status = FrameMetadata::Status::FrameError;
+
+ bufferCompleted.emit(buffer);
+ }
}
VirtualCameraConfiguration::VirtualCameraConfiguration(VirtualCameraData *data)
The change that moved frame generation to a separate thread introduced a race condition. After the last buffer of a request is completed, the loop in `VirtualCameraData::processRequest()` will reference the buffer map in the loop condition. This is problematic because concurrently the request will be completed, then reused or destroyed. This was mostly hidden by the fact that most application use `ReuseBuffers`, so the buffer map nodes do not change. Fix that by making a copy of the (stream, buffer) pairs locally. Fixes: 6c251ae3ef0e ("libcamera: pipeline: virtual: Move image generation to separate thread") Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> --- src/libcamera/pipeline/virtual/virtual.cpp | 40 +++++++++++++--------- 1 file changed, 23 insertions(+), 17 deletions(-)