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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 <iomanip>
#include <limits.h>
#include <sstream>
#include <libcamera/request.h>
#include "libcamera/internal/log.h"
#include "libcamera/internal/utils.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
* is taken into consideration when generating the sizes.
*
* Applications examining sizes as a range with step values of 0 shall be
* aware that the range are generated from a list of discrete sizes and there
* could be a large number of possible Size combinations that may not be
* supported by the Stream.
*
* All sizes retrieved from StreamFormats shall be treated as advisory and no
* size shall be considered to be supported until it has been verified using
* CameraConfiguration::validate().
*
* \todo Review the usage patterns of this class, and cache the computed
* pixelformats(), sizes() and range() if this would improve performances.
*/
StreamFormats::StreamFormats()
{
}
/**
* \brief Construct a StreamFormats object with a map of image formats
* \param[in] formats A map of pixel formats to a sizes description
*/
StreamFormats::StreamFormats(const std::map<PixelFormat, std::vector<SizeRange>> &formats)
: formats_(formats)
{
}
/**
* \brief Retrieve the list of supported pixel formats
* \return The list of supported pixel formats
*/
std::vector<PixelFormat> StreamFormats::pixelformats() const
{
std::vector<PixelFormat> formats;
for (auto const &it : formats_)
formats.push_back(it.first);
return formats;
}
/**
* \brief Retrieve the list of frame sizes supported for \a pixelformat
* \param[in] pixelformat PixelFormat to retrieve sizes for
*
* If the sizes described for \a pixelformat are discrete they are returned
* directly.
*
* If the sizes are described as a range, a list of discrete sizes are computed
* from a list of common resolutions that fit inside the described range. When
* computing the discrete list step values are considered but there are no
* guarantees that all sizes computed are supported.
*
* \return A list of frame sizes or an empty list on error
*/
std::vector<Size> StreamFormats::sizes(const PixelFormat &pixelformat) const
{
/*
* Sizes to try and extract from ranges.
* \todo Verify list of resolutions are good, current list compiled
* from v4l2 documentation and source code as well as lists of
* common frame sizes.
*/
static const std::array<Size, 53> rangeDiscreteSizes = {
Size(160, 120),
Size(240, 160),
Size(320, 240),
Size(400, 240),
Size(480, 320),
Size(640, 360),
Size(640, 480),
Size(720, 480),
Size(720, 576),
Size(768, 480),
Size(800, 600),
Size(854, 480),
Size(960, 540),
Size(960, 640),
Size(1024, 576),
Size(1024, 600),
Size(1024, 768),
Size(1152, 864),
Size(1280, 1024),
Size(1280, 1080),
Size(1280, 720),
Size(1280, 800),
Size(1360, 768),
Size(1366, 768),
Size(1400, 1050),
Size(1440, 900),
Size(1536, 864),
Size(1600, 1200),
Size(1600, 900),
Size(1680, 1050),
Size(1920, 1080),
Size(1920, 1200),
Size(2048, 1080),
Size(2048, 1152),
Size(2048, 1536),
Size(2160, 1080),
Size(2560, 1080),
Size(2560, 1440),
Size(2560, 1600),
Size(2560, 2048),
Size(2960, 1440),
Size(3200, 1800),
Size(3200, 2048),
Size(3200, 2400),
Size(3440, 1440),
Size(3840, 1080),
Size(3840, 1600),
Size(3840, 2160),
Size(3840, 2400),
Size(4096, 2160),
Size(5120, 2160),
Size(5120, 2880),
Size(7680, 4320),
};
std::vector<Size> sizes;
/* Make sure pixel format exists. */
auto const &it = formats_.find(pixelformat);
if (it == formats_.end())
return {};
/* Try creating a list of discrete sizes. */
const std::vector<SizeRange> &ranges = it->second;
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