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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Raspberry Pi (Trading) Ltd.
*
* dng_writer.cpp - DNG writer
*/
#include "dng_writer.h"
#include <iostream>
#include <map>
#include <tiffio.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);
};
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++) {
*out++ = (in[0] + in[1] + in[stride] + in[stride + 1]) >> 2;
in += skip;
}
}
static const std::map<PixelFormat, FormatInfo> formatInfo = {
{ PixelFormat(DRM_FORMAT_SBGGR10, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 10,
.pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
.packScanline = packScanlineSBGGR10P,
.thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SGBRG10, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 10,
.pattern = { CFAPatternGreen, CFAPatternBlue, CFAPatternRed, CFAPatternGreen },
.packScanline = packScanlineSBGGR10P,
.thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SGRBG10, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 10,
.pattern = { CFAPatternGreen, CFAPatternRed, CFAPatternBlue, CFAPatternGreen },
.packScanline = packScanlineSBGGR10P,
.thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SRGGB10, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 10,
.pattern = { CFAPatternRed, CFAPatternGreen, CFAPatternGreen, CFAPatternBlue },
.packScanline = packScanlineSBGGR10P,
.thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SBGGR12, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 12,
.pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
.packScanline = packScanlineSBGGR12P,
.thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SGBRG12, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 12,
.pattern = { CFAPatternGreen, CFAPatternBlue, CFAPatternRed, CFAPatternGreen },
.packScanline = packScanlineSBGGR12P,
.thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SGRBG12, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 12,
.pattern = { CFAPatternGreen, CFAPatternRed, CFAPatternBlue, CFAPatternGreen },
.packScanline = packScanlineSBGGR12P,
.thumbScanline = thumbScanlineSBGGRxxP,
} },
{ PixelFormat(DRM_FORMAT_SRGGB12, MIPI_FORMAT_MOD_CSI2_PACKED), {
.bitsPerSample = 12,
.pattern = { CFAPatternRed, CFAPatternGreen, CFAPatternGreen, CFAPatternBlue },
.packScanline = packScanlineSBGGR12P,
.thumbScanline = thumbScanlineSBGGRxxP,
} },
};
int DNGWriter::write(const char *filename, const Camera *camera,
const StreamConfiguration &config,
const ControlList &metadata,
const FrameBuffer *buffer, const void *data)
{
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;
/*
* 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");
TIFFSetField(tif, TIFFTAG_MODEL, camera->name().c_str());
TIFFSetField(tif, TIFFTAG_UNIQUECAMERAMODEL, camera->name().c_str());
TIFFSetField(tif, TIFFTAG_SOFTWARE, "qcam");
TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
/*
* Thumbnail-specific tags. The thumbnail is stored as a greyscale image
* with 1/16 of the raw image resolution.
*/
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_MINISBLACK);
TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
/*
* Reserve space for the SubIFD tag, pointing to the IFD for the raw
* image. The real offset will be set later.
*/
TIFFSetField(tif, TIFFTAG_SUBIFD, 1, &rawIFDOffset);
/* 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);
TIFFSetField(tif, TIFFTAG_CFAPATTERN, info->pattern);
TIFFSetField(tif, TIFFTAG_CFAPLANECOLOR, 3, cfaPlaneColor);
TIFFSetField(tif, TIFFTAG_CFALAYOUT, 1);
/* \todo Add more EXIF fields to output. */
/* 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);
/* Update the IFD offsets and close the file. */
TIFFSetDirectory(tif, 0);
TIFFSetField(tif, TIFFTAG_SUBIFD, 1, &rawIFDOffset);
TIFFWriteDirectory(tif);
TIFFClose(tif);
return 0;
}
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