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/* SPDX-License-Identifier: LGPL-2.1-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_DECLARE_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 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.
*/
void EncoderLibJpeg::compressNV(const MappedBuffer *frame)
{
uint8_t tmprowbuf[compress_.image_width * 3];
/*
* \todo Use the raw api, and only unpack the cb/cr samples to new line
* buffers. If possible, see if we can set appropriate pixel strides
* too to save even that copy.
*
* Possible hints at:
* https://sourceforge.net/p/libjpeg/mailman/message/30815123/
*/
unsigned int y_stride = pixelFormatInfo_->stride(compress_.image_width, 0);
unsigned int c_stride = pixelFormatInfo_->stride(compress_.image_width, 1);
unsigned int horzSubSample = 2 * compress_.image_width / c_stride;
unsigned int vertSubSample = pixelFormatInfo_->planes[1].verticalSubSampling;
unsigned int c_inc = horzSubSample == 1 ? 2 : 0;
unsigned int cb_pos = nvSwap_ ? 1 : 0;
unsigned int cr_pos = nvSwap_ ? 0 : 1;
const unsigned char *src = static_cast<unsigned char *>(frame->maps()[0].data());
const unsigned char *src_c = src + y_stride * compress_.image_height;
JSAMPROW row_pointer[1];
row_pointer[0] = &tmprowbuf[0];
for (unsigned int y = 0; y < compress_.image_height; y++) {
unsigned char *dst = &tmprowbuf[0];
const unsigned char *src_y = src + y * compress_.image_width;
const unsigned char *src_cb = src_c + (y / vertSubSample) * c_stride + cb_pos;
const unsigned char *src_cr = src_c + (y / vertSubSample) * c_stride + cr_pos;
for (unsigned int x = 0; x < compress_.image_width; x += 2) {
dst[0] = *src_y;
dst[1] = *src_cb;
dst[2] = *src_cr;
src_y++;
src_cb += c_inc;
src_cr += c_inc;
dst += 3;
dst[0] = *src_y;
dst[1] = *src_cb;
dst[2] = *src_cr;
src_y++;
src_cb += 2;
src_cr += 2;
dst += 3;
}
jpeg_write_scanlines(&compress_, row_pointer, 1);
}
}
int EncoderLibJpeg::encode(const FrameBuffer &source, Span<uint8_t> dest,
const Span<const uint8_t> &exifData)
{
MappedFrameBuffer frame(&source, PROT_READ);
if (!frame.isValid()) {
LOG(JPEG, Error) << "Failed to map FrameBuffer : "
<< strerror(frame.error());
return frame.error();
}
unsigned char *destination = dest.data();
unsigned long size = dest.size();
/*
* The jpeg_mem_dest will reallocate if the required size is not
* sufficient. That means the output won't be written to the correct
* buffers.
*
* \todo Implement our own custom memory destination to prevent
* reallocation and prefer failure with correct reporting.
*/
jpeg_mem_dest(&compress_, &destination, &size);
jpeg_start_compress(&compress_, TRUE);
if (exifData.size())
/* Store Exif data in the JPEG_APP1 data block. */
jpeg_write_marker(&compress_, JPEG_APP0 + 1,
static_cast<const JOCTET *>(exifData.data()),
exifData.size());
LOG(JPEG, Debug) << "JPEG Encode Starting:" << compress_.image_width
<< "x" << compress_.image_height;
if (nv_)
compressNV(&frame);
else
compressRGB(&frame);
jpeg_finish_compress(&compress_);
return size;
}
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