android: camera_stream: Add sourceStream

Add a sourceStream field to the CameraStream class, meant to contain a
reference to the direct stream which produces actual image data for
streams of type CameraStream::Mapped.

The sourceStream of mapped streams will be used in later patches to make
sure for each Mapped stream at least one libcamera::Stream is queued to
the libcamera::Camera.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
index 8e804d4d..773cb3b6 100644
--- a/src/android/camera_device.cpp
+++ b/src/android/camera_device.cpp
@@ -681,10 +681,23 @@ int CameraDevice::configureStreams(camera3_stream_configuration_t *stream_list)
 	for (const auto &streamConfig : streamConfigs) {
 		config->addConfiguration(streamConfig.config);
 
+		CameraStream *sourceStream = nullptr;
 		for (auto &stream : streamConfig.streams) {
 			streams_.emplace_back(this, config.get(), stream.type,
-					      stream.stream, config->size() - 1);
+					      stream.stream, sourceStream,
+					      config->size() - 1);
 			stream.stream->priv = static_cast<void *>(&streams_.back());
+
+			/*
+			 * The streamConfig.streams vector contains as its first
+			 * element a Direct (or Internal) stream, and then an
+			 * optional set of Mapped streams derived from the
+			 * Direct stream. Cache the Direct stream pointer, to
+			 * be used when constructing the subsequent mapped
+			 * streams.
+			 */
+			if (stream.type == CameraStream::Type::Direct)
+				sourceStream = &streams_.back();
 		}
 	}