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-rw-r--r--src/libcamera/pipeline/simple/simple.cpp21
1 files changed, 15 insertions, 6 deletions
diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index 17fd744c..9f822397 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -228,6 +228,8 @@ protected:
int queueRequestDevice(Camera *camera, Request *request) override;
private:
+ static constexpr unsigned int kNumInternalBuffers = 3;
+
SimpleCameraData *cameraData(const Camera *camera)
{
return static_cast<SimpleCameraData *>(
@@ -700,7 +702,7 @@ int SimplePipelineHandler::configure(Camera *camera, CameraConfiguration *c)
inputCfg.pixelFormat = pipeConfig->captureFormat;
inputCfg.size = pipeConfig->captureSize;
inputCfg.stride = captureFormat.planes[0].bpl;
- inputCfg.bufferCount = cfg.bufferCount;
+ inputCfg.bufferCount = kNumInternalBuffers;
ret = converter_->configure(inputCfg, { cfg });
if (ret < 0) {
@@ -737,13 +739,20 @@ int SimplePipelineHandler::start(Camera *camera, [[maybe_unused]] const ControlL
{
SimpleCameraData *data = cameraData(camera);
V4L2VideoDevice *video = data->video_;
- unsigned int count = data->streams_[0].configuration().bufferCount;
int ret;
- if (data->useConverter_)
- ret = video->allocateBuffers(count, &data->converterBuffers_);
- else
- ret = video->importBuffers(count);
+ if (data->useConverter_) {
+ /*
+ * When using the converter allocate a fixed number of internal
+ * buffers.
+ */
+ ret = video->allocateBuffers(kNumInternalBuffers,
+ &data->converterBuffers_);
+ } else {
+ /* Otherwise, prepare for using buffers from the only stream. */
+ Stream *stream = &data->streams_[0];
+ ret = video->importBuffers(stream->configuration().bufferCount);
+ }
if (ret < 0)
return ret;