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-rw-r--r--src/cam/dng_writer.cpp621
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diff --git a/src/cam/dng_writer.cpp b/src/cam/dng_writer.cpp
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Raspberry Pi Ltd
+ *
+ * dng_writer.cpp - DNG writer
+ */
+
+#include "dng_writer.h"
+
+#include <algorithm>
+#include <iostream>
+#include <map>
+
+#include <tiffio.h>
+
+#include <libcamera/control_ids.h>
+#include <libcamera/formats.h>
+#include <libcamera/property_ids.h>
+
+using namespace libcamera;
+
+enum CFAPatternColour : uint8_t {
+ CFAPatternRed = 0,
+ CFAPatternGreen = 1,
+ CFAPatternBlue = 2,
+};
+
+struct FormatInfo {
+ uint8_t bitsPerSample;
+ CFAPatternColour pattern[4];
+ void (*packScanline)(void *output, const void *input,
+ unsigned int width);
+ void (*thumbScanline)(const FormatInfo &info, void *output,
+ const void *input, unsigned int width,
+ unsigned int stride);
+};
+
+struct Matrix3d {
+ Matrix3d()
+ {
+ }
+
+ Matrix3d(float m0, float m1, float m2,
+ float m3, float m4, float m5,
+ float m6, float m7, float m8)
+ {
+ m[0] = m0, m[1] = m1, m[2] = m2;
+ m[3] = m3, m[4] = m4, m[5] = m5;
+ m[6] = m6, m[7] = m7, m[8] = m8;
+ }
+
+ Matrix3d(const Span<const float> &span)
+ : Matrix3d(span[0], span[1], span[2],
+ span[3], span[4], span[5],
+ span[6], span[7], span[8])
+ {
+ }
+
+ static Matrix3d diag(float diag0, float diag1, float diag2)
+ {
+ return Matrix3d(diag0, 0, 0, 0, diag1, 0, 0, 0, diag2);
+ }
+
+ static Matrix3d identity()
+ {
+ return Matrix3d(1, 0, 0, 0, 1, 0, 0, 0, 1);
+ }
+
+ Matrix3d transpose() const
+ {
+ return { m[0], m[3], m[6], m[1], m[4], m[7], m[2], m[5], m[8] };
+ }
+
+ Matrix3d cofactors() const
+ {
+ return { m[4] * m[8] - m[5] * m[7],
+ -(m[3] * m[8] - m[5] * m[6]),
+ m[3] * m[7] - m[4] * m[6],
+ -(m[1] * m[8] - m[2] * m[7]),
+ m[0] * m[8] - m[2] * m[6],
+ -(m[0] * m[7] - m[1] * m[6]),
+ m[1] * m[5] - m[2] * m[4],
+ -(m[0] * m[5] - m[2] * m[3]),
+ m[0] * m[4] - m[1] * m[3] };
+ }
+
+ Matrix3d adjugate() const
+ {
+ return cofactors().transpose();
+ }
+
+ float determinant() const
+ {
+ return m[0] * (m[4] * m[8] - m[5] * m[7]) -
+ m[1] * (m[3] * m[8] - m[5] * m[6]) +
+ m[2] * (m[3] * m[7] - m[4] * m[6]);
+ }
+
+ Matrix3d inverse() const
+ {
+ return adjugate() * (1.0 / determinant());
+ }
+
+ Matrix3d operator*(const Matrix3d &other) const
+ {
+ Matrix3d result;
+ for (unsigned int i = 0; i < 3; i++) {
+ for (unsigned int j = 0; j < 3; j++) {
+ result.m[i * 3 + j] =
+ m[i * 3 + 0] * other.m[0 + j] +
+ m[i * 3 + 1] * other.m[3 + j] +
+ m[i * 3 + 2] * other.m[6 + j];
+ }
+ }
+ return result;
+ }
+
+ Matrix3d operator*(float f) const
+ {
+ Matrix3d result;
+ for (unsigned int i = 0; i < 9; i++)
+ result.m[i] = m[i] * f;
+ return result;
+ }
+
+ float m[9];
+};
+
+void packScanlineSBGGR10P(void *output, const void *input, unsigned int width)
+{
+ const uint8_t *in = static_cast<const uint8_t *>(input);
+ uint8_t *out = static_cast<uint8_t *>(output);
+
+ /* \todo Can this be made more efficient? */
+ for (unsigned int x = 0; x < width; x += 4) {
+ *out++ = in[0];
+ *out++ = (in[4] & 0x03) << 6 | in[1] >> 2;
+ *out++ = (in[1] & 0x03) << 6 | (in[4] & 0x0c) << 2 | in[2] >> 4;
+ *out++ = (in[2] & 0x0f) << 4 | (in[4] & 0x30) >> 2 | in[3] >> 6;
+ *out++ = (in[3] & 0x3f) << 2 | (in[4] & 0xc0) >> 6;
+ in += 5;
+ }
+}
+
+void packScanlineSBGGR12P(void *output, const void *input, unsigned int width)
+{
+ const uint8_t *in = static_cast<const uint8_t *>(input);
+ uint8_t *out = static_cast<uint8_t *>(output);
+
+ /* \todo Can this be made more efficient? */
+ for (unsigned int i = 0; i < width; i += 2) {
+ *out++ = in[0];
+ *out++ = (in[2] & 0x0f) << 4 | in[1] >> 4;
+ *out++ = (in[1] & 0x0f) << 4 | in[2] >> 4;
+ in += 3;
+ }
+}
+
+void thumbScanlineSBGGRxxP(const FormatInfo &info, void *output,
+ const void *input, unsigned int width,
+ unsigned int stride)
+{
+ const uint8_t *in = static_cast<const uint8_t *>(input);
+ uint8_t *out = static_cast<uint8_t *>(output);
+
+ /* Number of bytes corresponding to 16 pixels. */
+ unsigned int skip = info.bitsPerSample * 16 / 8;
+
+ for (unsigned int x = 0; x < width; x++) {
+ uint8_t value = (in[0] + in[1] + in[stride] + in[stride + 1]) >> 2;
+ *out++ = value;
+ *out++ = value;
+ *out++ = value;
+ in += skip;
+ }
+}
+
+void packScanlineIPU3(void *output, const void *input, unsigned int width)
+{
+ const uint8_t *in = static_cast<const uint8_t *>(input);
+ uint16_t *out = static_cast<uint16_t *>(output);
+
+ /*
+ * Upscale the 10-bit format to 16-bit as it's not trivial to pack it
+ * as 10-bit without gaps.
+ *
+ * \todo Improve packing to keep the 10-bit sample size.
+ */
+ unsigned int x = 0;
+ while (true) {
+ for (unsigned int i = 0; i < 6; i++) {
+ *out++ = (in[1] & 0x03) << 14 | (in[0] & 0xff) << 6;
+ if (++x >= width)
+ return;
+
+ *out++ = (in[2] & 0x0f) << 12 | (in[1] & 0xfc) << 4;
+ if (++x >= width)
+ return;
+
+ *out++ = (in[3] & 0x3f) << 10 | (in[2] & 0xf0) << 2;
+ if (++x >= width)
+ return;
+
+ *out++ = (in[4] & 0xff) << 8 | (in[3] & 0xc0) << 0;
+ if (++x >= width)
+ return;
+
+ in += 5;
+ }
+
+ *out++ = (in[1] & 0x03) << 14 | (in[0] & 0xff) << 6;
+ if (++x >= width)
+ return;
+
+ in += 2;
+ }
+}
+
+void thumbScanlineIPU3([[maybe_unused]] const FormatInfo &info, void *output,
+ const void *input, unsigned int width,
+ unsigned int stride)
+{
+ uint8_t *out = static_cast<uint8_t *>(output);
+
+ for (unsigned int x = 0; x < width; x++) {
+ unsigned int pixel = x * 16;
+ unsigned int block = pixel / 25;
+ unsigned int pixelInBlock = pixel - block * 25;
+
+ /*
+ * If the pixel is the last in the block cheat a little and
+ * move one pixel backward to avoid reading between two blocks
+ * and having to deal with the padding bits.
+ */
+ if (pixelInBlock == 24)
+ pixelInBlock--;
+
+ const uint8_t *in = static_cast<const uint8_t *>(input)
+ + block * 32 + (pixelInBlock / 4) * 5;
+
+ uint16_t val1, val2, val3, val4;
+ switch (pixelInBlock % 4) {
+ case 0:
+ val1 = (in[1] & 0x03) << 14 | (in[0] & 0xff) << 6;
+ val2 = (in[2] & 0x0f) << 12 | (in[1] & 0xfc) << 4;
+ val3 = (in[stride + 1] & 0x03) << 14 | (in[stride + 0] & 0xff) << 6;
+ val4 = (in[stride + 2] & 0x0f) << 12 | (in[stride + 1] & 0xfc) << 4;
+ break;
+ case 1:
+ val1 = (in[2] & 0x0f) << 12 | (in[1] & 0xfc) << 4;
+ val2 = (in[3] & 0x3f) << 10 | (in[2] & 0xf0) << 2;
+ val3 = (in[stride + 2] & 0x0f) << 12 | (in[stride + 1] & 0xfc) << 4;
+ val4 = (in[stride + 3] & 0x3f) << 10 | (in[stride + 2] & 0xf0) << 2;
+ break;
+ case 2:
+ val1 = (in[3] & 0x3f) << 10 | (in[2] & 0xf0) << 2;
+ val2 = (in[4] & 0xff) << 8 | (in[3] & 0xc0) << 0;
+ val3 = (in[stride + 3] & 0x3f) << 10 | (in[stride + 2] & 0xf0) << 2;
+ val4 = (in[stride + 4] & 0xff) << 8 | (in[stride + 3] & 0xc0) << 0;
+ break;
+ case 3:
+ val1 = (in[4] & 0xff) << 8 | (in[3] & 0xc0) << 0;
+ val2 = (in[6] & 0x03) << 14 | (in[5] & 0xff) << 6;
+ val3 = (in[stride + 4] & 0xff) << 8 | (in[stride + 3] & 0xc0) << 0;
+ val4 = (in[stride + 6] & 0x03) << 14 | (in[stride + 5] & 0xff) << 6;
+ break;
+ }
+
+ uint8_t value = (val1 + val2 + val3 + val4) >> 10;
+ *out++ = value;
+ *out++ = value;
+ *out++ = value;
+ }
+}
+
+static const std::map<PixelFormat, FormatInfo> formatInfo = {
+ { formats::SBGGR10_CSI2P, {
+ .bitsPerSample = 10,
+ .pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
+ .packScanline = packScanlineSBGGR10P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
+ } },
+ { formats::SGBRG10_CSI2P, {
+ .bitsPerSample = 10,
+ .pattern = { CFAPatternGreen, CFAPatternBlue, CFAPatternRed, CFAPatternGreen },
+ .packScanline = packScanlineSBGGR10P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
+ } },
+ { formats::SGRBG10_CSI2P, {
+ .bitsPerSample = 10,
+ .pattern = { CFAPatternGreen, CFAPatternRed, CFAPatternBlue, CFAPatternGreen },
+ .packScanline = packScanlineSBGGR10P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
+ } },
+ { formats::SRGGB10_CSI2P, {
+ .bitsPerSample = 10,
+ .pattern = { CFAPatternRed, CFAPatternGreen, CFAPatternGreen, CFAPatternBlue },
+ .packScanline = packScanlineSBGGR10P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
+ } },
+ { formats::SBGGR12_CSI2P, {
+ .bitsPerSample = 12,
+ .pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
+ .packScanline = packScanlineSBGGR12P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
+ } },
+ { formats::SGBRG12_CSI2P, {
+ .bitsPerSample = 12,
+ .pattern = { CFAPatternGreen, CFAPatternBlue, CFAPatternRed, CFAPatternGreen },
+ .packScanline = packScanlineSBGGR12P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
+ } },
+ { formats::SGRBG12_CSI2P, {
+ .bitsPerSample = 12,
+ .pattern = { CFAPatternGreen, CFAPatternRed, CFAPatternBlue, CFAPatternGreen },
+ .packScanline = packScanlineSBGGR12P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
+ } },
+ { formats::SRGGB12_CSI2P, {
+ .bitsPerSample = 12,
+ .pattern = { CFAPatternRed, CFAPatternGreen, CFAPatternGreen, CFAPatternBlue },
+ .packScanline = packScanlineSBGGR12P,
+ .thumbScanline = thumbScanlineSBGGRxxP,
+ } },
+ { formats::SBGGR10_IPU3, {
+ .bitsPerSample = 16,
+ .pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
+ .packScanline = packScanlineIPU3,
+ .thumbScanline = thumbScanlineIPU3,
+ } },
+ { formats::SGBRG10_IPU3, {
+ .bitsPerSample = 16,
+ .pattern = { CFAPatternGreen, CFAPatternBlue, CFAPatternRed, CFAPatternGreen },
+ .packScanline = packScanlineIPU3,
+ .thumbScanline = thumbScanlineIPU3,
+ } },
+ { formats::SGRBG10_IPU3, {
+ .bitsPerSample = 16,
+ .pattern = { CFAPatternGreen, CFAPatternRed, CFAPatternBlue, CFAPatternGreen },
+ .packScanline = packScanlineIPU3,
+ .thumbScanline = thumbScanlineIPU3,
+ } },
+ { formats::SRGGB10_IPU3, {
+ .bitsPerSample = 16,
+ .pattern = { CFAPatternRed, CFAPatternGreen, CFAPatternGreen, CFAPatternBlue },
+ .packScanline = packScanlineIPU3,
+ .thumbScanline = thumbScanlineIPU3,
+ } },
+};
+
+int DNGWriter::write(const char *filename, const Camera *camera,
+ const StreamConfiguration &config,
+ const ControlList &metadata,
+ [[maybe_unused]] const FrameBuffer *buffer,
+ const void *data)
+{
+ const ControlList &cameraProperties = camera->properties();
+
+ const auto it = formatInfo.find(config.pixelFormat);
+ if (it == formatInfo.cend()) {
+ std::cerr << "Unsupported pixel format" << std::endl;
+ return -EINVAL;
+ }
+ const FormatInfo *info = &it->second;
+
+ TIFF *tif = TIFFOpen(filename, "w");
+ if (!tif) {
+ std::cerr << "Failed to open tiff file" << std::endl;
+ return -EINVAL;
+ }
+
+ /*
+ * Scanline buffer, has to be large enough to store both a RAW scanline
+ * or a thumbnail scanline. The latter will always be much smaller than
+ * the former as we downscale by 16 in both directions.
+ */
+ uint8_t scanline[(config.size.width * info->bitsPerSample + 7) / 8];
+
+ toff_t rawIFDOffset = 0;
+ toff_t exifIFDOffset = 0;
+
+ /*
+ * Start with a thumbnail in IFD 0 for compatibility with TIFF baseline
+ * readers, as required by the TIFF/EP specification. Tags that apply to
+ * the whole file are stored here.
+ */
+ const uint8_t version[] = { 1, 2, 0, 0 };
+
+ TIFFSetField(tif, TIFFTAG_DNGVERSION, version);
+ TIFFSetField(tif, TIFFTAG_DNGBACKWARDVERSION, version);
+ TIFFSetField(tif, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
+ TIFFSetField(tif, TIFFTAG_MAKE, "libcamera");
+
+ const auto &model = cameraProperties.get(properties::Model);
+ if (model) {
+ TIFFSetField(tif, TIFFTAG_MODEL, model->c_str());
+ /* \todo set TIFFTAG_UNIQUECAMERAMODEL. */
+ }
+
+ TIFFSetField(tif, TIFFTAG_SOFTWARE, "qcam");
+ TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
+
+ /*
+ * Thumbnail-specific tags. The thumbnail is stored as an RGB image
+ * with 1/16 of the raw image resolution. Greyscale would save space,
+ * but doesn't seem well supported by RawTherapee.
+ */
+ TIFFSetField(tif, TIFFTAG_SUBFILETYPE, FILETYPE_REDUCEDIMAGE);
+ TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, config.size.width / 16);
+ TIFFSetField(tif, TIFFTAG_IMAGELENGTH, config.size.height / 16);
+ TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
+ TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
+ TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
+ TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 3);
+ TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
+ TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
+
+ /*
+ * Fill in some reasonable colour information in the DNG. We supply
+ * the "neutral" colour values which determine the white balance, and the
+ * "ColorMatrix1" which converts XYZ to (un-white-balanced) camera RGB.
+ * Note that this is not a "proper" colour calibration for the DNG,
+ * nonetheless, many tools should be able to render the colours better.
+ */
+ float neutral[3] = { 1, 1, 1 };
+ Matrix3d wbGain = Matrix3d::identity();
+ /* From http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html */
+ const Matrix3d rgb2xyz(0.4124564, 0.3575761, 0.1804375,
+ 0.2126729, 0.7151522, 0.0721750,
+ 0.0193339, 0.1191920, 0.9503041);
+ Matrix3d ccm = Matrix3d::identity();
+ /*
+ * Pick a reasonable number eps to protect against singularities. It
+ * should be comfortably larger than the point at which we run into
+ * numerical trouble, yet smaller than any plausible gain that we might
+ * apply to a colour, either explicitly or as part of the colour matrix.
+ */
+ const double eps = 1e-2;
+
+ const auto &colourGains = metadata.get(controls::ColourGains);
+ if (colourGains) {
+ if ((*colourGains)[0] > eps && (*colourGains)[1] > eps) {
+ wbGain = Matrix3d::diag((*colourGains)[0], 1, (*colourGains)[1]);
+ neutral[0] = 1.0 / (*colourGains)[0]; /* red */
+ neutral[2] = 1.0 / (*colourGains)[1]; /* blue */
+ }
+ }
+
+ const auto &ccmControl = metadata.get(controls::ColourCorrectionMatrix);
+ if (ccmControl) {
+ Matrix3d ccmSupplied(*ccmControl);
+ if (ccmSupplied.determinant() > eps)
+ ccm = ccmSupplied;
+ }
+
+ /*
+ * rgb2xyz is known to be invertible, and we've ensured above that both
+ * the ccm and wbGain matrices are non-singular, so the product of all
+ * three is guaranteed to be invertible too.
+ */
+ Matrix3d colorMatrix1 = (rgb2xyz * ccm * wbGain).inverse();
+
+ TIFFSetField(tif, TIFFTAG_COLORMATRIX1, 9, colorMatrix1.m);
+ TIFFSetField(tif, TIFFTAG_ASSHOTNEUTRAL, 3, neutral);
+
+ /*
+ * Reserve space for the SubIFD and ExifIFD tags, pointing to the IFD
+ * for the raw image and EXIF data respectively. The real offsets will
+ * be set later.
+ */
+ TIFFSetField(tif, TIFFTAG_SUBIFD, 1, &rawIFDOffset);
+ TIFFSetField(tif, TIFFTAG_EXIFIFD, exifIFDOffset);
+
+ /* Write the thumbnail. */
+ const uint8_t *row = static_cast<const uint8_t *>(data);
+ for (unsigned int y = 0; y < config.size.height / 16; y++) {
+ info->thumbScanline(*info, &scanline, row,
+ config.size.width / 16, config.stride);
+
+ if (TIFFWriteScanline(tif, &scanline, y, 0) != 1) {
+ std::cerr << "Failed to write thumbnail scanline"
+ << std::endl;
+ TIFFClose(tif);
+ return -EINVAL;
+ }
+
+ row += config.stride * 16;
+ }
+
+ TIFFWriteDirectory(tif);
+
+ /* Create a new IFD for the RAW image. */
+ const uint16_t cfaRepeatPatternDim[] = { 2, 2 };
+ const uint8_t cfaPlaneColor[] = {
+ CFAPatternRed,
+ CFAPatternGreen,
+ CFAPatternBlue
+ };
+
+ TIFFSetField(tif, TIFFTAG_SUBFILETYPE, 0);
+ TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, config.size.width);
+ TIFFSetField(tif, TIFFTAG_IMAGELENGTH, config.size.height);
+ TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, info->bitsPerSample);
+ TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
+ TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_CFA);
+ TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
+ TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
+ TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
+ TIFFSetField(tif, TIFFTAG_CFAREPEATPATTERNDIM, cfaRepeatPatternDim);
+ if (TIFFLIB_VERSION < 20201219)
+ TIFFSetField(tif, TIFFTAG_CFAPATTERN, info->pattern);
+ else
+ TIFFSetField(tif, TIFFTAG_CFAPATTERN, 4, info->pattern);
+ TIFFSetField(tif, TIFFTAG_CFAPLANECOLOR, 3, cfaPlaneColor);
+ TIFFSetField(tif, TIFFTAG_CFALAYOUT, 1);
+
+ const uint16_t blackLevelRepeatDim[] = { 2, 2 };
+ float blackLevel[] = { 0.0f, 0.0f, 0.0f, 0.0f };
+ uint32_t whiteLevel = (1 << info->bitsPerSample) - 1;
+
+ const auto &blackLevels = metadata.get(controls::SensorBlackLevels);
+ if (blackLevels) {
+ Span<const int32_t, 4> levels = *blackLevels;
+
+ /*
+ * The black levels control is specified in R, Gr, Gb, B order.
+ * Map it to the TIFF tag that is specified in CFA pattern
+ * order.
+ */
+ unsigned int green = (info->pattern[0] == CFAPatternRed ||
+ info->pattern[1] == CFAPatternRed)
+ ? 0 : 1;
+
+ for (unsigned int i = 0; i < 4; ++i) {
+ unsigned int level;
+
+ switch (info->pattern[i]) {
+ case CFAPatternRed:
+ level = levels[0];
+ break;
+ case CFAPatternGreen:
+ level = levels[green + 1];
+ green = (green + 1) % 2;
+ break;
+ case CFAPatternBlue:
+ default:
+ level = levels[3];
+ break;
+ }
+
+ /* Map the 16-bit value to the bits per sample range. */
+ blackLevel[i] = level >> (16 - info->bitsPerSample);
+ }
+ }
+
+ TIFFSetField(tif, TIFFTAG_BLACKLEVELREPEATDIM, &blackLevelRepeatDim);
+ TIFFSetField(tif, TIFFTAG_BLACKLEVEL, 4, &blackLevel);
+ TIFFSetField(tif, TIFFTAG_WHITELEVEL, 1, &whiteLevel);
+
+ /* Write RAW content. */
+ row = static_cast<const uint8_t *>(data);
+ for (unsigned int y = 0; y < config.size.height; y++) {
+ info->packScanline(&scanline, row, config.size.width);
+
+ if (TIFFWriteScanline(tif, &scanline, y, 0) != 1) {
+ std::cerr << "Failed to write RAW scanline"
+ << std::endl;
+ TIFFClose(tif);
+ return -EINVAL;
+ }
+
+ row += config.stride;
+ }
+
+ /* Checkpoint the IFD to retrieve its offset, and write it out. */
+ TIFFCheckpointDirectory(tif);
+ rawIFDOffset = TIFFCurrentDirOffset(tif);
+ TIFFWriteDirectory(tif);
+
+ /* Create a new IFD for the EXIF data and fill it. */
+ TIFFCreateEXIFDirectory(tif);
+
+ /* Store creation time. */
+ time_t rawtime;
+ struct tm *timeinfo;
+ char strTime[20];
+
+ time(&rawtime);
+ timeinfo = localtime(&rawtime);
+ strftime(strTime, 20, "%Y:%m:%d %H:%M:%S", timeinfo);
+
+ /*
+ * \todo Handle timezone information by setting OffsetTimeOriginal and
+ * OffsetTimeDigitized once libtiff catches up to the specification and
+ * has EXIFTAG_ defines to handle them.
+ */
+ TIFFSetField(tif, EXIFTAG_DATETIMEORIGINAL, strTime);
+ TIFFSetField(tif, EXIFTAG_DATETIMEDIGITIZED, strTime);
+
+ const auto &analogGain = metadata.get(controls::AnalogueGain);
+ if (analogGain) {
+ uint16_t iso = std::min(std::max(*analogGain * 100, 0.0f), 65535.0f);
+ TIFFSetField(tif, EXIFTAG_ISOSPEEDRATINGS, 1, &iso);
+ }
+
+ const auto &exposureTime = metadata.get(controls::ExposureTime);
+ if (exposureTime)
+ TIFFSetField(tif, EXIFTAG_EXPOSURETIME, *exposureTime / 1e6);
+
+ TIFFWriteCustomDirectory(tif, &exifIFDOffset);
+
+ /* Update the IFD offsets and close the file. */
+ TIFFSetDirectory(tif, 0);
+ TIFFSetField(tif, TIFFTAG_SUBIFD, 1, &rawIFDOffset);
+ TIFFSetField(tif, TIFFTAG_EXIFIFD, exifIFDOffset);
+ TIFFWriteDirectory(tif);
+
+ TIFFClose(tif);
+
+ return 0;
+}