2 files changed, 51 insertions, 0 deletions
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index f9f25c0e..9f6ff99e 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -10,6 +10,7 @@ libcamera_sources = files([
     'media_object.cpp',
     'pipeline_handler.cpp',
     'signal.cpp',
+    'stream.cpp',
     'timer.cpp',
     'v4l2_device.cpp',
 ])
diff --git a/src/libcamera/stream.cpp b/src/libcamera/stream.cpp
new file mode 100644
index 00000000..9417c588
--- /dev/null
+++ b/src/libcamera/stream.cpp
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * stream.cpp - Video stream for a Camera
+ */
+
+#include <libcamera/stream.h>
+
+/**
+ * \file stream.h
+ * \brief Video stream for a Camera
+ *
+ * A camera device can provide frames in different resolutions and formats
+ * concurrently from a single image source. The Stream class represents
+ * one of the multiple concurrent streams.
+ *
+ * All streams exposed by a camera device share the same image source and are
+ * thus not fully independent. Parameters related to the image source, such as
+ * the exposure time or flash control, are common to all streams. Other
+ * parameters, such as format or resolution, may be specified per-stream,
+ * depending on the capabilities of the camera device.
+ *
+ * Camera devices expose at least one stream, and may expose additional streams
+ * based on the device capabilities. This can be used, for instance, to
+ * implement concurrent viewfinder and video capture, or concurrent viewfinder,
+ * video capture and still image capture.
+ */
+
+namespace libcamera {
+
+/**
+ * \class Stream
+ * \brief Video stream for a camera
+ *
+ * The Stream class models all static information which are associated with a
+ * single video stream. Streams are exposed by the Camera object they belong to.
+ *
+ * Cameras may supply more than one stream from the same video source. In such
+ * cases an application can inspect all available streams and select the ones
+ * that best fit its use case.
+ *
+ * \todo Add capabilities to the stream API. Without this the Stream class only
+ * serves to reveal how many streams of unknown capabilities a camera supports.
+ * This in itself is productive as it allows applications to configure and
+ * capture from one or more streams even if they won't be able to select the
+ * optimal stream for the task.
+ */
+
+} /* namespace libcamera */