[PATCH v3 8/8] libcamera: simple: Make raw streams working

[Milan Zamazal]

When a raw stream is requested, whether alone or together with a
processed stream, its buffers must be handled outside the software ISP
machinery.  They serve as output buffers, even when a processed stream
is produced.

At most one raw stream and at most one processed stream are supported
and can be combined.  An example of producing both raw and processed
files using `cam' application:

  cam -c1 -C100 -Ffile# \
    -s role=viewfinder,width=1920,height=1080,pixelformat=RGB888 \
    -s role=raw,width=3280,height=2464,pixelformat=SRGGB8 \

Note the difference in viewfinder and raw stream sizes due to the fact
that debayering requires enlarging the image width, which enforces
selecting a larger sensor resolution in this case.

This is the final step to make raw streams working.

Signed-off-by: Milan Zamazal <mzamazal at redhat.com>
---
 src/libcamera/pipeline/simple/simple.cpp | 26 +++++++++++++++---------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index 5b68d2e0..8eee9d8a 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -814,7 +814,8 @@ void SimpleCameraData::imageBufferReady(FrameBuffer *buffer)
 		 * buffer for capture (unless the stream is being stopped), and
 		 * complete the request with all the user-facing buffers.
 		 */
-		if (buffer->metadata().status != FrameMetadata::FrameCancelled)
+		if (buffer->metadata().status != FrameMetadata::FrameCancelled &&
+		    !rawRequested_)
 			video_->queueBuffer(buffer);
 
 		if (conversionQueue_.empty())
@@ -860,13 +861,14 @@ void SimpleCameraData::imageBufferReady(FrameBuffer *buffer)
 	 */
 	if (useConversion_) {
 		if (conversionQueue_.empty()) {
-			video_->queueBuffer(buffer);
+			if (!rawRequested_)
+				video_->queueBuffer(buffer);
 			return;
 		}
 
 		if (converter_)
 			converter_->queueBuffers(buffer, conversionQueue_.front().outputs);
-		else
+		else if (processedRequested_)
 			/*
 			 * request->sequence() cannot be retrieved from `buffer' inside
 			 * queueBuffers because unique_ptr's make buffer->request() invalid
@@ -876,6 +878,8 @@ void SimpleCameraData::imageBufferReady(FrameBuffer *buffer)
 					     conversionQueue_.front().outputs);
 
 		conversionQueue_.pop();
+		if (rawRequested_)
+			pipe->completeBuffer(request, buffer);
 		return;
 	}
 
@@ -895,7 +899,8 @@ void SimpleCameraData::clearIncompleteRequests()
 void SimpleCameraData::conversionInputDone(FrameBuffer *buffer)
 {
 	/* Queue the input buffer back for capture. */
-	video_->queueBuffer(buffer);
+	if (!rawRequested_)
+		video_->queueBuffer(buffer);
 }
 
 void SimpleCameraData::conversionOutputDone(FrameBuffer *buffer)
@@ -1413,7 +1418,7 @@ int SimplePipelineHandler::exportFrameBuffers(Camera *camera, Stream *stream,
 	 * Export buffers on the converter or capture video node, depending on
 	 * whether the converter is used or not.
 	 */
-	if (data->useConversion_)
+	if (data->useConversion_ && !data->rawRequested_)
 		return data->converter_
 			       ? data->converter_->exportBuffers(stream, count, buffers)
 			       : data->swIsp_->exportBuffers(stream, count, buffers);
@@ -1435,7 +1440,7 @@ int SimplePipelineHandler::start(Camera *camera, [[maybe_unused]] const ControlL
 		return -EBUSY;
 	}
 
-	if (data->useConversion_) {
+	if (data->useConversion_ && !data->rawRequested_) {
 		/*
 		 * When using the converter allocate a fixed number of internal
 		 * buffers.
@@ -1443,7 +1448,7 @@ int SimplePipelineHandler::start(Camera *camera, [[maybe_unused]] const ControlL
 		ret = video->allocateBuffers(kNumInternalBuffers,
 					     &data->conversionBuffers_);
 	} else {
-		/* Otherwise, prepare for using buffers from the only stream. */
+		/* Otherwise, prepare for using buffers from the only or raw stream. */
 		Stream *stream = &data->streams_[0];
 		ret = video->importBuffers(stream->configuration().bufferCount);
 	}
@@ -1474,8 +1479,9 @@ int SimplePipelineHandler::start(Camera *camera, [[maybe_unused]] const ControlL
 		}
 
 		/* Queue all internal buffers for capture. */
-		for (std::unique_ptr<FrameBuffer> &buffer : data->conversionBuffers_)
-			video->queueBuffer(buffer.get());
+		if (!data->rawRequested_)
+			for (std::unique_ptr<FrameBuffer> &buffer : data->conversionBuffers_)
+				video->queueBuffer(buffer.get());
 	}
 
 	return 0;
@@ -1517,7 +1523,7 @@ int SimplePipelineHandler::queueRequestDevice(Camera *camera, Request *request)
 		 * queue, it will be handed to the converter in the capture
 		 * completion handler.
 		 */
-		if (data->useConversion_) {
+		if (data->useConversion_ && !isRawFormat(stream->configuration().pixelFormat)) {
 			buffers.emplace(stream, buffer);
 		} else {
 			ret = data->video_->queueBuffer(buffer);
-- 
2.48.1