[libcamera-devel] [PATCH v3 3/3] android: camera_device: Configure one stream for identical stream requests

[Hirokazu Honda]

An Android HAL client may request identical stream requests. It is
redundant that a native camera device produces a separate stream for
each of the identical requests.
Configure camera one stream configuration for the identical stream
requests.

Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>
---
 src/android/camera_device.cpp | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
index 74a95a2a..1cb4e675 100644
--- a/src/android/camera_device.cpp
+++ b/src/android/camera_device.cpp
@@ -618,14 +618,32 @@ int CameraDevice::configureStreams(camera3_stream_configuration_t *stream_list)
 			continue;
 		}
 
+		/* This stream will be produced by hardware. */
+		stream->usage |= GRALLOC_USAGE_HW_CAMERA_WRITE;
+
+		/*
+		 * If a CameraStream with the same size and format of the
+		 * current stream has already been requested, associate the two.
+		 */
+		auto iter = std::find_if(
+			streamConfigs.begin(), streamConfigs.end(),
+			[size, format](const Camera3StreamConfig &streamConfig) {
+				return streamConfig.config.size == size &&
+				       streamConfig.config.pixelFormat == format;
+			});
+		if (iter != streamConfigs.end()) {
+			/* Add usage to copy the buffer in streams[0] to stream. */
+			iter->streams[0].stream->usage |= GRALLOC_USAGE_SW_READ_OFTEN;
+			stream->usage |= GRALLOC_USAGE_SW_WRITE_OFTEN;
+			iter->streams.push_back({ stream, CameraStream::Type::Mapped });
+			continue;
+		}
+
 		Camera3StreamConfig streamConfig;
 		streamConfig.streams = { { stream, CameraStream::Type::Direct } };
 		streamConfig.config.size = size;
 		streamConfig.config.pixelFormat = format;
 		streamConfigs.push_back(std::move(streamConfig));
-
-		/* This stream will be produced by hardware. */
-		stream->usage |= GRALLOC_USAGE_HW_CAMERA_WRITE;
 	}
 
 	/* Now handle the MJPEG streams, adding a new stream if required. */
@@ -1144,12 +1162,12 @@ void CameraDevice::requestComplete(Request *request)
 		resultMetadata = std::make_unique<CameraMetadata>(0, 0);
 	}
 
-	/* Handle any JPEG compression. */
+	/* Handle post-processing. */
 	for (camera3_stream_buffer_t &buffer : descriptor.buffers_) {
 		CameraStream *cameraStream =
 			static_cast<CameraStream *>(buffer.stream->priv);
 
-		if (cameraStream->camera3Stream().format != HAL_PIXEL_FORMAT_BLOB)
+		if (cameraStream->type() == CameraStream::Type::Direct)
 			continue;
 
 		FrameBuffer *src = request->findBuffer(cameraStream->stream());
-- 
2.33.0.259.gc128427fd7-goog