/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2019, Google Inc. * * libcamera V4L2 Subdevice format handling test */ #include #include #include #include #include "libcamera/internal/v4l2_subdevice.h" #include "v4l2_subdevice_test.h" using namespace std; using namespace libcamera; /* List image formats on the "Scaler" subdevice of vimc media device. */ class ListFormatsTest : public V4L2SubdeviceTest { protected: int run() override; private: void printFormats(unsigned int pad, unsigned code, const std::vector &sizes); }; void ListFormatsTest::printFormats(unsigned int pad, unsigned int code, const std::vector &sizes) { cout << "Enumerate formats on pad " << pad << endl; for (const SizeRange &size : sizes) { cout << " mbus code: " << utils::hex(code, 4) << endl; cout << " min width: " << dec << size.min.width << endl; cout << " min height: " << dec << size.min.height << endl; cout << " max width: " << dec << size.max.width << endl; cout << " max height: " << dec << size.max.height << endl; } } int ListFormatsTest::run() { /* List all formats available on existing "Scaler" pads. */ V4L2Subdevice::Formats formats; formats = scaler_->formats(0); if (formats.empty()) { cerr << "Failed to list formats on pad 0 of subdevice " << scaler_->entity()->name() << endl; return TestFail; } for (unsigned int code : utils::map_keys(formats)) printFormats(0, code, formats[code]); formats = scaler_->formats(1); if (formats.empty()) { cerr << "Failed to list formats on pad 1 of subdevice " << scaler_->entity()->name() << endl; return TestFail; } for (unsigned int code : utils::map_keys(formats)) printFormats(1, code, formats[code]); /* List format on a non-existing pad, format vector shall be empty. */ formats = scaler_->formats(2); if (!formats.empty()) { cerr << "Listing formats on non-existing pad 2 of subdevice " << scaler_->entity()->name() << " should return an empty format list" << endl; return TestFail; } return TestPass; } TEST_REGISTER(ListFormatsTest) /streams/next&id=3a924ee250ade392643656eeef88f380bf519c2e'>diff
path: root/src/libcamera/stream.cpp
blob: c28b4cd669b2543b9b227127fc5e76d7e68b20cf (plain) 
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * stream.cpp - Video stream for a Camera
 */

#include <libcamera/stream.h>

#include <algorithm>
#include <array>
#include <climits>
#include <iomanip>
#include <sstream>

#include <libcamera/request.h>

#include "log.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 {

LOG_DEFINE_CATEGORY(Stream)

/**
 * \class StreamFormats
 * \brief Hold information about supported stream formats
 *
 * The StreamFormats class holds information about the pixel formats and frame
 * sizes a stream supports. The class groups size information by the pixel
 * format which can produce it.
 *
 * There are two ways to examine the size information, as a range or as a list
 * of discrete sizes. When sizes are viewed as a range it describes the minimum
 * and maximum width and height values. The range description can include
 * horizontal and vertical steps.
 *
 * When sizes are viewed as a list of discrete sizes they describe the exact
 * dimensions which can be selected and used.
 *
 * Pipeline handlers can create StreamFormats describing each pixel format using
 * either a range or a list of discrete sizes. The StreamFormats class attempts
 * to translate between the two different ways to view them. The translations
 * are performed as:
 *
 *  - If the StreamFormat is constructed using a list of discrete image sizes
 *    and a range is requested, it gets created by taking the minimum and
 *    maximum width/height in the list. The step information is not recreated
 *    and is set to 0 to indicate the range is generated.
 *
 *  - If the image sizes used to construct a StreamFormat are expressed as a
 *    range and a list of discrete sizes is requested, one which fits inside
 *    that range are selected from a list of common sizes. The step information