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/*
* Copyright (C) 2017 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 <stdio.h> // stdio.h must appear before jpeglib.h
#include <jpeglib.h>
#include <android-base/logging.h>
#include "host/frontend/vnc_server/jpeg_compressor.h"
#include "host/frontend/vnc_server/vnc_utils.h"
#include "host/libs/screen_connector/screen_connector.h"
using cvd::vnc::JpegCompressor;
namespace {
void InitCinfo(jpeg_compress_struct* cinfo, jpeg_error_mgr* err,
std::uint16_t width, std::uint16_t height, int jpeg_quality) {
cinfo->err = jpeg_std_error(err);
jpeg_create_compress(cinfo);
cinfo->image_width = width;
cinfo->image_height = height;
cinfo->input_components = cvd::ScreenConnector::BytesPerPixel();
cinfo->in_color_space = JCS_EXT_RGBX;
jpeg_set_defaults(cinfo);
jpeg_set_quality(cinfo, jpeg_quality, true);
}
} // namespace
cvd::Message JpegCompressor::Compress(const Message& frame,
int jpeg_quality, std::uint16_t x,
std::uint16_t y, std::uint16_t width,
std::uint16_t height,
int stride) {
jpeg_compress_struct cinfo{};
jpeg_error_mgr err{};
InitCinfo(&cinfo, &err, width, height, jpeg_quality);
auto* compression_buffer = buffer_.get();
auto compression_buffer_size = buffer_capacity_;
jpeg_mem_dest(&cinfo, &compression_buffer, &compression_buffer_size);
jpeg_start_compress(&cinfo, true);
while (cinfo.next_scanline < cinfo.image_height) {
auto row = static_cast<JSAMPROW>(const_cast<std::uint8_t*>(
&frame[(y * stride) +
(cinfo.next_scanline * stride) +
(x * cvd::ScreenConnector::BytesPerPixel())]));
jpeg_write_scanlines(&cinfo, &row, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
UpdateBuffer(compression_buffer, compression_buffer_size);
return {compression_buffer, compression_buffer + compression_buffer_size};
}
void JpegCompressor::UpdateBuffer(std::uint8_t* compression_buffer,
unsigned long compression_buffer_size) {
if (buffer_.get() != compression_buffer) {
buffer_capacity_ = compression_buffer_size;
buffer_.reset(compression_buffer);
}
}
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