android: camera_device: Add buffers for each stream to Requests

Construct a FrameBuffer for every buffer given in the camera3Request
and add it to the libcamera Request on the appropriate stream.

The correct stream is obtained from the private data of the camera3_stream
associated with the camera3_buffer.

Comments regarding supporting only one buffer are now removed, and
FrameBuffers have their lifetime tracked in the Camera3RequestDescriptor
to ensure they are released when the Request is completed.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/android/camera_device.cpp

@@ -98,6 +98,7 @@ CameraDevice::Camera3RequestDescriptor::Camera3RequestDescriptor(
 	: frameNumber(frameNumber), numBuffers(numBuffers)
 {
 	buffers = new camera3_stream_buffer_t[numBuffers];
+	frameBuffers.reserve(numBuffers);
 }
 
 CameraDevice::Camera3RequestDescriptor::~Camera3RequestDescriptor()
@@ -990,6 +991,7 @@ int CameraDevice::configureStreams(camera3_stream_configuration_t *stream_list)
 		config_->addConfiguration(streamConfiguration);
 
 		streams_[i].index = streamIndex++;
+		stream->priv = static_cast<void *>(&streams_[i]);
 	}
 
 	switch (config_->validate()) {
@@ -1048,9 +1050,6 @@ FrameBuffer *CameraDevice::createFrameBuffer(const buffer_handle_t camera3buffer
 
 int CameraDevice::processCaptureRequest(camera3_capture_request_t *camera3Request)
 {
-	StreamConfiguration *streamConfiguration = &config_->at(0);
-	Stream *stream = streamConfiguration->stream();
-
 	if (camera3Request->num_output_buffers != 1) {
 		LOG(HAL, Error) << "Invalid number of output buffers: "
 				<< camera3Request->num_output_buffers;
@@ -1088,30 +1087,36 @@ int CameraDevice::processCaptureRequest(camera3_capture_request_t *camera3Reques
 		camera_->createRequest(reinterpret_cast<uint64_t>(descriptor));
 
 	for (unsigned int i = 0; i < descriptor->numBuffers; ++i) {
+		CameraStream *cameraStream =
+			static_cast<CameraStream *>(camera3Buffers[i].stream->priv);
+
 		/*
 		 * Keep track of which stream the request belongs to and store
 		 * the native buffer handles.
-		 *
-		 * \todo Currently we only support one capture buffer. Copy
-		 * all of them to be ready once we'll support more.
 		 */
 		descriptor->buffers[i].stream = camera3Buffers[i].stream;
 		descriptor->buffers[i].buffer = camera3Buffers[i].buffer;
-	}
 
-	/*
+		/*
-	 * Create a libcamera buffer using the dmabuf descriptors of the first
+		 * Create a libcamera buffer using the dmabuf descriptors of
-	 * and (currently) only supported request buffer.
+		 * the camera3Buffer for each stream. The FrameBuffer is
-	 */
+		 * directly associated with the Camera3RequestDescriptor for
-	FrameBuffer *buffer = createFrameBuffer(*camera3Buffers[0].buffer);
+		 * lifetime management only.
-	if (!buffer) {
+		 */
-		LOG(HAL, Error) << "Failed to create buffer";
+		FrameBuffer *buffer = createFrameBuffer(*camera3Buffers[i].buffer);
-		delete request;
+		if (!buffer) {
-		delete descriptor;
+			LOG(HAL, Error) << "Failed to create buffer";
-		return -ENOMEM;
+			delete request;
-	}
+			delete descriptor;
+			return -ENOMEM;
+		}
+		descriptor->frameBuffers.emplace_back(buffer);
 
-	request->addBuffer(stream, buffer);
+		StreamConfiguration *streamConfiguration = &config_->at(cameraStream->index);
+		Stream *stream = streamConfiguration->stream();
+
+		request->addBuffer(stream, buffer);
+	}
 
 	int ret = camera_->queueRequest(request);
 	if (ret) {
@@ -1127,7 +1132,6 @@ int CameraDevice::processCaptureRequest(camera3_capture_request_t *camera3Reques
 void CameraDevice::requestComplete(Request *request)
 {
 	const std::map<Stream *, FrameBuffer *> &buffers = request->buffers();
-	FrameBuffer *buffer = buffers.begin()->second;
 	camera3_buffer_status status = CAMERA3_BUFFER_STATUS_OK;
 	std::unique_ptr<CameraMetadata> resultMetadata;
 
@@ -1145,10 +1149,6 @@ void CameraDevice::requestComplete(Request *request)
 	captureResult.frame_number = descriptor->frameNumber;
 	captureResult.num_output_buffers = descriptor->numBuffers;
 	for (unsigned int i = 0; i < descriptor->numBuffers; ++i) {
-		/*
-		 * \todo Currently we only support one capture buffer. Prepare
-		 * all of them to be ready once we'll support more.
-		 */
 		descriptor->buffers[i].acquire_fence = -1;
 		descriptor->buffers[i].release_fence = -1;
 		descriptor->buffers[i].status = status;
@@ -1156,6 +1156,14 @@ void CameraDevice::requestComplete(Request *request)
 	captureResult.output_buffers =
 		const_cast<const camera3_stream_buffer_t *>(descriptor->buffers);
 
+	/*
+	 * \todo The timestamp used for the metadata is currently always taken
+	 * from the first buffer (which may be the first stream) in the Request.
+	 * It might be appropriate to return a 'correct' (as determined by
+	 * pipeline handlers) timestamp in the Request itself.
+	 */
+	FrameBuffer *buffer = buffers.begin()->second;
+
 	if (status == CAMERA3_BUFFER_STATUS_OK) {
 		notifyShutter(descriptor->frameNumber,
 			      buffer->metadata().timestamp);
@@ -1180,7 +1188,6 @@ void CameraDevice::requestComplete(Request *request)
 	callbacks_->process_capture_result(callbacks_, &captureResult);
 
 	delete descriptor;
-	delete buffer;
 }
 
 std::string CameraDevice::logPrefix() const

src/android/camera_device.h

@@ -70,6 +70,7 @@ private:
 		uint32_t frameNumber;
 		uint32_t numBuffers;
 		camera3_stream_buffer_t *buffers;
+		std::vector<std::unique_ptr<libcamera::FrameBuffer>> frameBuffers;
 	};
 
 	struct Camera3StreamConfiguration {