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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Google Inc.
*
* post_processor_jpeg.cpp - JPEG Post Processor
*/
#include "post_processor_jpeg.h"
#include <chrono>
#include "../camera_device.h"
#include "../camera_metadata.h"
#include "encoder_libjpeg.h"
#include "exif.h"
#include <libcamera/formats.h>
#include "libcamera/internal/log.h"
using namespace libcamera;
using namespace std::chrono_literals;
LOG_DEFINE_CATEGORY(JPEG)
PostProcessorJpeg::PostProcessorJpeg(CameraDevice *const device)
: cameraDevice_(device)
{
}
int PostProcessorJpeg::configure(const StreamConfiguration &inCfg,
const StreamConfiguration &outCfg)
{
if (inCfg.size != outCfg.size) {
LOG(JPEG, Error) << "Mismatch of input and output stream sizes";
return -EINVAL;
}
if (outCfg.pixelFormat != formats::MJPEG) {
LOG(JPEG, Error) << "Output stream pixel format is not JPEG";
return -EINVAL;
}
streamSize_ = outCfg.size;
thumbnailer_.configure(inCfg.size, inCfg.pixelFormat);
encoder_ = std::make_unique<EncoderLibJpeg>();
return encoder_->configure(inCfg);
}
void PostProcessorJpeg::generateThumbnail(const FrameBuffer &source,
const Size &targetSize,
unsigned int quality,
std::vector<unsigned char> *thumbnail)
{
/* Stores the raw scaled-down thumbnail bytes. */
std::vector<unsigned char> rawThumbnail;
thumbnailer_.createThumbnail(source, targetSize, &rawThumbnail);
StreamConfiguration thCfg;
thCfg.size = targetSize;
thCfg.pixelFormat = thumbnailer_.pixelFormat();
int ret = thumbnailEncoder_.configure(thCfg);
if (!rawThumbnail.empty() && !ret) {
/*
* \todo Avoid value-initialization of all elements of the
* vector.
*/
thumbnail->resize(rawThumbnail.size());
int jpeg_size = thumbnailEncoder_.encode(rawThumbnail,
*thumbnail, {}, quality);
thumbnail->resize(jpeg_size);
LOG(JPEG, Debug)
<< "Thumbnail compress returned "
<< jpeg_size << " bytes";
}
}
int PostProcessorJpeg::process(const FrameBuffer &source,
Span<uint8_t> destination,
const CameraMetadata &requestMetadata,
CameraMetadata *resultMetadata)
{
if (!encoder_)
return 0;
camera_metadata_ro_entry_t entry;
int ret;
/* Set EXIF metadata for various tags. */
Exif exif;
exif.setMake(cameraDevice_->maker());
exif.setModel(cameraDevice_->model());
ret = requestMetadata.getEntry(ANDROID_JPEG_ORIENTATION, &entry);
const uint32_t jpegOrientation = ret ? *entry.data.i32 : 0;
resultMetadata->addEntry(ANDROID_JPEG_ORIENTATION, &jpegOrientation, 1);
exif.setOrientation(jpegOrientation);
exif.setSize(streamSize_);
/*
* We set the frame's EXIF timestamp as the time of encode.
* Since the precision we need for EXIF timestamp is only one
* second, it is good enough.
*/
exif.setTimestamp(std::time(nullptr), 0ms);
/* \todo Get this information from libcamera::Request::metadata */
exif.setExposureTime(0);
ret = requestMetadata.getEntry(ANDROID_LENS_APERTURE, &entry);
if (ret)
exif.setAperture(*entry.data.f);
exif.setISO(100);
exif.setFlash(Exif::Flash::FlashNotPresent);
exif.setWhiteBalance(Exif::WhiteBalance::Auto);
exif.setFocalLength(1.0);
ret = requestMetadata.getEntry(ANDROID_JPEG_GPS_TIMESTAMP, &entry);
if (ret) {
exif.setGPSDateTimestamp(*entry.data.i64);
resultMetadata->addEntry(ANDROID_JPEG_GPS_TIMESTAMP,
entry.data.i64, 1);
}
ret = requestMetadata.getEntry(ANDROID_JPEG_THUMBNAIL_SIZE, &entry);
if (ret) {
const int32_t *data = entry.data.i32;
Size thumbnailSize = { static_cast<uint32_t>(data[0]),
static_cast<uint32_t>(data[1]) };
ret = requestMetadata.getEntry(ANDROID_JPEG_THUMBNAIL_QUALITY, &entry);
uint8_t quality = ret ? *entry.data.u8 : 95;
resultMetadata->addEntry(ANDROID_JPEG_THUMBNAIL_QUALITY, &quality, 1);
if (thumbnailSize != Size(0, 0)) {
std::vector<unsigned char> thumbnail;
generateThumbnail(source, thumbnailSize, quality, &thumbnail);
if (!thumbnail.empty())
exif.setThumbnail(thumbnail, Exif::Compression::JPEG);
}
resultMetadata->addEntry(ANDROID_JPEG_THUMBNAIL_SIZE, data, 2);
}
ret = requestMetadata.getEntry(ANDROID_JPEG_GPS_COORDINATES, &entry);
if (ret) {
exif.setGPSLocation(entry.data.d);
resultMetadata->addEntry(ANDROID_JPEG_GPS_COORDINATES,
entry.data.d, 3);
}
ret = requestMetadata.getEntry(ANDROID_JPEG_GPS_PROCESSING_METHOD, &entry);
if (ret) {
std::string method(entry.data.u8, entry.data.u8 + entry.count);
exif.setGPSMethod(method);
resultMetadata->addEntry(ANDROID_JPEG_GPS_PROCESSING_METHOD,
entry.data.u8, entry.count);
}
if (exif.generate() != 0)
LOG(JPEG, Error) << "Failed to generate valid EXIF data";
ret = requestMetadata.getEntry(ANDROID_JPEG_QUALITY, &entry);
const uint8_t quality = ret ? *entry.data.u8 : 95;
resultMetadata->addEntry(ANDROID_JPEG_QUALITY, &quality, 1);
int jpeg_size = encoder_->encode(source, destination, exif.data(), quality);
if (jpeg_size < 0) {
LOG(JPEG, Error) << "Failed to encode stream image";
return jpeg_size;
}
/*
* Fill in the JPEG blob header.
*
* The mapped size of the buffer is being returned as
* substantially larger than the requested JPEG_MAX_SIZE
* (which is referenced from maxJpegBufferSize_). Utilise
* this static size to ensure the correct offset of the blob is
* determined.
*
* \todo Investigate if the buffer size mismatch is an issue or
* expected behaviour.
*/
uint8_t *resultPtr = destination.data() +
cameraDevice_->maxJpegBufferSize() -
sizeof(struct camera3_jpeg_blob);
auto *blob = reinterpret_cast<struct camera3_jpeg_blob *>(resultPtr);
blob->jpeg_blob_id = CAMERA3_JPEG_BLOB_ID;
blob->jpeg_size = jpeg_size;
/* Update the JPEG result Metadata. */
resultMetadata->addEntry(ANDROID_JPEG_SIZE, &jpeg_size, 1);
return 0;
}
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