libcamera/libcamera.git - libcamera official repository

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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2020, Google Inc. * * encoder_libjpeg.cpp - JPEG encoding using libjpeg native API */ #include "encoder_libjpeg.h" #include <fcntl.h> #include <iomanip> #include <iostream> #include <sstream> #include <string.h> #include <sys/mman.h> #include <unistd.h> #include <vector> #include <libcamera/camera.h> #include <libcamera/formats.h> #include <libcamera/pixel_format.h> #include "libcamera/internal/formats.h" #include "libcamera/internal/log.h" using namespace libcamera; LOG_DEFINE_CATEGORY(JPEG) namespace { struct JPEGPixelFormatInfo { J_COLOR_SPACE colorSpace; const PixelFormatInfo &pixelFormatInfo; bool nvSwap; }; const std::map<PixelFormat, JPEGPixelFormatInfo> pixelInfo{ { formats::R8, { JCS_GRAYSCALE, PixelFormatInfo::info(formats::R8), false } }, { formats::RGB888, { JCS_EXT_BGR, PixelFormatInfo::info(formats::RGB888), false } }, { formats::BGR888, { JCS_EXT_RGB, PixelFormatInfo::info(formats::BGR888), false } }, { formats::NV12, { JCS_YCbCr, PixelFormatInfo::info(formats::NV12), false } }, { formats::NV21, { JCS_YCbCr, PixelFormatInfo::info(formats::NV21), true } }, { formats::NV16, { JCS_YCbCr, PixelFormatInfo::info(formats::NV16), false } }, { formats::NV61, { JCS_YCbCr, PixelFormatInfo::info(formats::NV61), true } }, { formats::NV24, { JCS_YCbCr, PixelFormatInfo::info(formats::NV24), false } }, { formats::NV42, { JCS_YCbCr, PixelFormatInfo::info(formats::NV42), true } }, }; const struct JPEGPixelFormatInfo &findPixelInfo(const PixelFormat &format) { static const struct JPEGPixelFormatInfo invalidPixelFormat { JCS_UNKNOWN, PixelFormatInfo(), false }; const auto iter = pixelInfo.find(format); if (iter == pixelInfo.end()) { LOG(JPEG, Error) << "Unsupported pixel format for JPEG encoder: " << format.toString(); return invalidPixelFormat; } return iter->second; } } /* namespace */ EncoderLibJpeg::EncoderLibJpeg() : quality_(95) { /* \todo Expand error handling coverage with a custom handler. */ compress_.err = jpeg_std_error(&jerr_); jpeg_create_compress(&compress_); } EncoderLibJpeg::~EncoderLibJpeg() { jpeg_destroy_compress(&compress_); } int EncoderLibJpeg::configure(const StreamConfiguration &cfg) { const struct JPEGPixelFormatInfo info = findPixelInfo(cfg.pixelFormat); if (info.colorSpace == JCS_UNKNOWN) return -ENOTSUP; compress_.image_width = cfg.size.width; compress_.image_height = cfg.size.height; compress_.in_color_space = info.colorSpace; compress_.input_components = info.colorSpace == JCS_GRAYSCALE ? 1 : 3; jpeg_set_defaults(&compress_); jpeg_set_quality(&compress_, quality_, TRUE); pixelFormatInfo_ = &info.pixelFormatInfo; nv_ = pixelFormatInfo_->numPlanes() == 2; nvSwap_ = info.nvSwap; return 0; } void EncoderLibJpeg::compressRGB(const libcamera::MappedBuffer *frame) { unsigned char *src = static_cast<unsigned char *>(frame->maps()[0].data()); /* \todo Stride information should come from buffer configuration. */ unsigned int stride = pixelFormatInfo_->stride(compress_.image_width, 0); JSAMPROW row_pointer[1]; while (compress_.next_scanline < compress_.image_height) { row_pointer[0] = &src[compress_.next_scanline * stride]; jpeg_write_scanlines(&compress_, row_pointer, 1); } } /* * Compress the incoming buffer from a supported NV format. * This naively unpacks the semi-planar NV12 to a YUV888 format for libjpeg.


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