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/*
* Copyright 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <ultrahdr/jpegencoderhelper.h>
#include <utils/Log.h>
#include <errno.h>
namespace android::ultrahdr {
// The destination manager that can access |mResultBuffer| in JpegEncoderHelper.
struct destination_mgr {
public:
struct jpeg_destination_mgr mgr;
JpegEncoderHelper* encoder;
};
JpegEncoderHelper::JpegEncoderHelper() {
}
JpegEncoderHelper::~JpegEncoderHelper() {
}
bool JpegEncoderHelper::compressImage(const void* image, int width, int height, int quality,
const void* iccBuffer, unsigned int iccSize,
bool isSingleChannel) {
mResultBuffer.clear();
if (!encode(image, width, height, quality, iccBuffer, iccSize, isSingleChannel)) {
return false;
}
ALOGI("Compressed JPEG: %d[%dx%d] -> %zu bytes",
(width * height * 12) / 8, width, height, mResultBuffer.size());
return true;
}
void* JpegEncoderHelper::getCompressedImagePtr() {
return mResultBuffer.data();
}
size_t JpegEncoderHelper::getCompressedImageSize() {
return mResultBuffer.size();
}
void JpegEncoderHelper::initDestination(j_compress_ptr cinfo) {
destination_mgr* dest = reinterpret_cast<destination_mgr*>(cinfo->dest);
std::vector<JOCTET>& buffer = dest->encoder->mResultBuffer;
buffer.resize(kBlockSize);
dest->mgr.next_output_byte = &buffer[0];
dest->mgr.free_in_buffer = buffer.size();
}
boolean JpegEncoderHelper::emptyOutputBuffer(j_compress_ptr cinfo) {
destination_mgr* dest = reinterpret_cast<destination_mgr*>(cinfo->dest);
std::vector<JOCTET>& buffer = dest->encoder->mResultBuffer;
size_t oldsize = buffer.size();
buffer.resize(oldsize + kBlockSize);
dest->mgr.next_output_byte = &buffer[oldsize];
dest->mgr.free_in_buffer = kBlockSize;
return true;
}
void JpegEncoderHelper::terminateDestination(j_compress_ptr cinfo) {
destination_mgr* dest = reinterpret_cast<destination_mgr*>(cinfo->dest);
std::vector<JOCTET>& buffer = dest->encoder->mResultBuffer;
buffer.resize(buffer.size() - dest->mgr.free_in_buffer);
}
void JpegEncoderHelper::outputErrorMessage(j_common_ptr cinfo) {
char buffer[JMSG_LENGTH_MAX];
/* Create the message */
(*cinfo->err->format_message) (cinfo, buffer);
ALOGE("%s\n", buffer);
}
bool JpegEncoderHelper::encode(const void* image, int width, int height, int jpegQuality,
const void* iccBuffer, unsigned int iccSize, bool isSingleChannel) {
jpeg_compress_struct cinfo;
jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
// Override output_message() to print error log with ALOGE().
cinfo.err->output_message = &outputErrorMessage;
jpeg_create_compress(&cinfo);
setJpegDestination(&cinfo);
setJpegCompressStruct(width, height, jpegQuality, &cinfo, isSingleChannel);
jpeg_start_compress(&cinfo, TRUE);
if (iccBuffer != nullptr && iccSize > 0) {
jpeg_write_marker(&cinfo, JPEG_APP0 + 2, static_cast<const JOCTET*>(iccBuffer), iccSize);
}
if (!compress(&cinfo, static_cast<const uint8_t*>(image), isSingleChannel)) {
return false;
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return true;
}
void JpegEncoderHelper::setJpegDestination(jpeg_compress_struct* cinfo) {
destination_mgr* dest = static_cast<struct destination_mgr *>((*cinfo->mem->alloc_small) (
(j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(destination_mgr)));
dest->encoder = this;
dest->mgr.init_destination = &initDestination;
dest->mgr.empty_output_buffer = &emptyOutputBuffer;
dest->mgr.term_destination = &terminateDestination;
cinfo->dest = reinterpret_cast<struct jpeg_destination_mgr*>(dest);
}
void JpegEncoderHelper::setJpegCompressStruct(int width, int height, int quality,
jpeg_compress_struct* cinfo, bool isSingleChannel) {
cinfo->image_width = width;
cinfo->image_height = height;
if (isSingleChannel) {
cinfo->input_components = 1;
cinfo->in_color_space = JCS_GRAYSCALE;
} else {
cinfo->input_components = 3;
cinfo->in_color_space = JCS_YCbCr;
}
jpeg_set_defaults(cinfo);
jpeg_set_quality(cinfo, quality, TRUE);
jpeg_set_colorspace(cinfo, isSingleChannel ? JCS_GRAYSCALE : JCS_YCbCr);
cinfo->raw_data_in = TRUE;
cinfo->dct_method = JDCT_ISLOW;
if (!isSingleChannel) {
// Configure sampling factors. The sampling factor is JPEG subsampling 420 because the
// source format is YUV420.
cinfo->comp_info[0].h_samp_factor = 2;
cinfo->comp_info[0].v_samp_factor = 2;
cinfo->comp_info[1].h_samp_factor = 1;
cinfo->comp_info[1].v_samp_factor = 1;
cinfo->comp_info[2].h_samp_factor = 1;
cinfo->comp_info[2].v_samp_factor = 1;
}
}
bool JpegEncoderHelper::compress(
jpeg_compress_struct* cinfo, const uint8_t* image, bool isSingleChannel) {
if (isSingleChannel) {
return compressSingleChannel(cinfo, image);
}
return compressYuv(cinfo, image);
}
bool JpegEncoderHelper::compressYuv(jpeg_compress_struct* cinfo, const uint8_t* yuv) {
JSAMPROW y[kCompressBatchSize];
JSAMPROW cb[kCompressBatchSize / 2];
JSAMPROW cr[kCompressBatchSize / 2];
JSAMPARRAY planes[3] {y, cb, cr};
size_t y_plane_size = cinfo->image_width * cinfo->image_height;
size_t uv_plane_size = y_plane_size / 4;
uint8_t* y_plane = const_cast<uint8_t*>(yuv);
uint8_t* u_plane = const_cast<uint8_t*>(yuv + y_plane_size);
uint8_t* v_plane = const_cast<uint8_t*>(yuv + y_plane_size + uv_plane_size);
std::unique_ptr<uint8_t[]> empty(new uint8_t[cinfo->image_width]);
memset(empty.get(), 0, cinfo->image_width);
while (cinfo->next_scanline < cinfo->image_height) {
for (int i = 0; i < kCompressBatchSize; ++i) {
size_t scanline = cinfo->next_scanline + i;
if (scanline < cinfo->image_height) {
y[i] = y_plane + scanline * cinfo->image_width;
} else {
y[i] = empty.get();
}
}
// cb, cr only have half scanlines
for (int i = 0; i < kCompressBatchSize / 2; ++i) {
size_t scanline = cinfo->next_scanline / 2 + i;
if (scanline < cinfo->image_height / 2) {
int offset = scanline * (cinfo->image_width / 2);
cb[i] = u_plane + offset;
cr[i] = v_plane + offset;
} else {
cb[i] = cr[i] = empty.get();
}
}
int processed = jpeg_write_raw_data(cinfo, planes, kCompressBatchSize);
if (processed != kCompressBatchSize) {
ALOGE("Number of processed lines does not equal input lines.");
return false;
}
}
return true;
}
bool JpegEncoderHelper::compressSingleChannel(jpeg_compress_struct* cinfo, const uint8_t* image) {
JSAMPROW y[kCompressBatchSize];
JSAMPARRAY planes[1] {y};
uint8_t* y_plane = const_cast<uint8_t*>(image);
std::unique_ptr<uint8_t[]> empty(new uint8_t[cinfo->image_width]);
memset(empty.get(), 0, cinfo->image_width);
while (cinfo->next_scanline < cinfo->image_height) {
for (int i = 0; i < kCompressBatchSize; ++i) {
size_t scanline = cinfo->next_scanline + i;
if (scanline < cinfo->image_height) {
y[i] = y_plane + scanline * cinfo->image_width;
} else {
y[i] = empty.get();
}
}
int processed = jpeg_write_raw_data(cinfo, planes, kCompressBatchSize);
if (processed != kCompressBatchSize / 2) {
ALOGE("Number of processed lines does not equal input lines.");
return false;
}
}
return true;
}
} // namespace ultrahdr
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