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authorNiklas Söderlund <niklas.soderlund@ragnatech.se>2020-04-24 01:40:46 +0200
committerNiklas Söderlund <niklas.soderlund@ragnatech.se>2020-05-01 12:24:07 +0200
commit693ab8816246b032459d3e1c8b1cafa9833a0325 (patch)
tree85b6ad39ca64d138194681b5493dde107f14cf26 /src/cam/stream_options.cpp
parentcdf7fbe35e60e9341809446a66a3e0637a74d743 (diff)
cam: Add helper class to parse stream configuration
Create a new helper class StreamKeyValueParser to parse command line options describing stream configurations. The goal is to share this new class between cam and qcam. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src/cam/stream_options.cpp')
-rw-r--r--src/cam/stream_options.cpp129
1 files changed, 129 insertions, 0 deletions
diff --git a/src/cam/stream_options.cpp b/src/cam/stream_options.cpp
new file mode 100644
index 00000000..bd12c8fd
--- /dev/null
+++ b/src/cam/stream_options.cpp
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Raspberry Pi (Trading) Ltd.
+ *
+ * stream_options.cpp - Helper to parse options for streams
+ */
+#include "stream_options.h"
+
+#include <iostream>
+
+using namespace libcamera;
+
+StreamKeyValueParser::StreamKeyValueParser()
+{
+ addOption("role", OptionString,
+ "Role for the stream (viewfinder, video, still, stillraw)",
+ ArgumentRequired);
+ addOption("width", OptionInteger, "Width in pixels",
+ ArgumentRequired);
+ addOption("height", OptionInteger, "Height in pixels",
+ ArgumentRequired);
+ addOption("pixelformat", OptionInteger, "Pixel format",
+ ArgumentRequired);
+}
+
+KeyValueParser::Options StreamKeyValueParser::parse(const char *arguments)
+{
+ KeyValueParser::Options options = KeyValueParser::parse(arguments);
+ StreamRole role;
+
+ if (options.valid() && options.isSet("role") &&
+ !parseRole(&role, options)) {
+ std::cerr << "Unknown stream role "
+ << options["role"].toString() << std::endl;
+ options.invalidate();
+ }
+
+ return options;
+}
+
+StreamRoles StreamKeyValueParser::roles(const OptionValue &values)
+{
+ const std::vector<OptionValue> &streamParameters = values.toArray();
+
+ /* If no configuration values to examine default to viewfinder. */
+ if (streamParameters.empty())
+ return { StreamRole::Viewfinder };
+
+ StreamRoles roles;
+ for (auto const &value : streamParameters) {
+ KeyValueParser::Options opts = value.toKeyValues();
+ StreamRole role;
+
+ /* If role is invalid or not set default to viewfinder. */
+ if (!parseRole(&role, value))
+ role = StreamRole::Viewfinder;
+
+ roles.push_back(role);
+ }
+
+ return roles;
+}
+
+int StreamKeyValueParser::updateConfiguration(CameraConfiguration *config,
+ const OptionValue &values)
+{
+ const std::vector<OptionValue> &streamParameters = values.toArray();
+
+ if (!config) {
+ std::cerr << "No configuration provided" << std::endl;
+ return -EINVAL;
+ }
+
+ /* If no configuration values nothing to do. */
+ if (!streamParameters.size())
+ return 0;
+
+ if (config->size() != streamParameters.size()) {
+ std::cerr
+ << "Number of streams in configuration "
+ << config->size()
+ << " does not match number of streams parsed "
+ << streamParameters.size()
+ << std::endl;
+ return -EINVAL;
+ }
+
+ unsigned int i = 0;
+ for (auto const &value : streamParameters) {
+ KeyValueParser::Options opts = value.toKeyValues();
+ StreamConfiguration &cfg = config->at(i++);
+
+ if (opts.isSet("width") && opts.isSet("height")) {
+ cfg.size.width = opts["width"];
+ cfg.size.height = opts["height"];
+ }
+
+ /* \todo Translate 4CC string to pixelformat with modifier. */
+ if (opts.isSet("pixelformat"))
+ cfg.pixelFormat = PixelFormat(opts["pixelformat"]);
+ }
+
+ return 0;
+}
+
+bool StreamKeyValueParser::parseRole(StreamRole *role,
+ const KeyValueParser::Options &options)
+{
+ if (!options.isSet("role"))
+ return false;
+
+ std::string name = options["role"].toString();
+
+ if (name == "viewfinder") {
+ *role = StreamRole::Viewfinder;
+ return true;
+ } else if (name == "video") {
+ *role = StreamRole::VideoRecording;
+ return true;
+ } else if (name == "still") {
+ *role = StreamRole::StillCapture;
+ return true;
+ } else if (name == "stillraw") {
+ *role = StreamRole::StillCaptureRaw;
+ return true;
+ }
+
+ return false;
+}