diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/libcamera/stream.cpp | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/libcamera/stream.cpp b/src/libcamera/stream.cpp index 0c59a31a..3398c597 100644 --- a/src/libcamera/stream.cpp +++ b/src/libcamera/stream.cpp @@ -7,9 +7,13 @@ #include <libcamera/stream.h> +#include <algorithm> +#include <climits> #include <iomanip> #include <sstream> +#include "log.h" + /** * \file stream.h * \brief Video stream for a Camera @@ -32,6 +36,232 @@ 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<unsigned int, std::vector<SizeRange>> &formats) + : formats_(formats) +{ +} + +/** + * \brief Retrieve the list of supported pixel formats + * \return The list of supported pixel formats + */ +std::vector<unsigned int> StreamFormats::pixelformats() const +{ + std::vector<unsigned int> 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 Pixel format 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(unsigned int 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; + bool discrete = true; + for (const SizeRange &range : ranges) { + if (range.min != range.max) { + discrete = false; + break; + } + sizes.emplace_back(range.min); + } + + /* If discrete not possible generate from range. */ + if (!discrete) { + if (ranges.size() != 1) { + LOG(Stream, Error) << "Range format is ambiguous"; + return {}; + } + + const SizeRange &limit = ranges.front(); + sizes.clear(); + + for (const Size &size : rangeDiscreteSizes) + if (limit.contains(size)) + sizes.push_back(size); + } + + std::sort(sizes.begin(), sizes.end()); + + return sizes; +} + +/** + * \brief Retrieve the range of minimum and maximum sizes + * \param[in] pixelformat Pixel format to retrieve range for + * + * If the size described for \a pixelformat is a range, that range is returned + * directly. If the sizes described are a list of discrete sizes, a range is + * created from the minimum and maximum sizes in the list. The step values of + * the range are set to 0 to indicate that the range is generated and that not + * all image sizes contained in the range might be supported. + * + * \return A range of valid image sizes or an empty range on error + */ +SizeRange StreamFormats::range(unsigned int pixelformat) const +{ + auto const it = formats_.find(pixelformat); + if (it == formats_.end()) + return {}; + + const std::vector<SizeRange> &ranges = it->second; + if (ranges.size() == 1) + return ranges[0]; + + LOG(Stream, Debug) << "Building range from discrete sizes"; + SizeRange range(UINT_MAX, UINT_MAX, 0, 0); + for (const SizeRange &limit : ranges) { + if (limit.min < range.min) + range.min = limit.min; + + if (limit.max > range.max) + range.max = limit.max; + } + + range.hStep = 0; + range.vStep = 0; + + return range; +} + /** * \struct StreamConfiguration * \brief Configuration parameters for a stream |