235   auto cinfo = std::make_unique<jpeg_compress_struct>();  in CompressYUV420Frame()  local
236   cinfo->err = jpeg_std_error(&jerr);  in CompressYUV420Frame()
237   cinfo->err->error_exit = [](j_common_ptr cinfo) {  in CompressYUV420Frame()  argument
238     (*cinfo->err->output_message)(cinfo);  in CompressYUV420Frame()
239     if (cinfo->client_data) {  in CompressYUV420Frame()
240       auto& dmgr = *static_cast<CustomJpegDestMgr*>(cinfo->client_data);  in CompressYUV420Frame()
245   jpeg_create_compress(cinfo.get());  in CompressYUV420Frame()
254   cinfo->client_data = static_cast<void*>(&dmgr);  in CompressYUV420Frame()
255   dmgr.init_destination = [](j_compress_ptr cinfo) {  in CompressYUV420Frame()  argument
256     auto& dmgr = static_cast<CustomJpegDestMgr&>(*cinfo->dest);  in CompressYUV420Frame()
263   dmgr.empty_output_buffer = [](j_compress_ptr cinfo __unused) {  in CompressYUV420Frame()
268   dmgr.term_destination = [](j_compress_ptr cinfo) {  in CompressYUV420Frame()  argument
269     auto& dmgr = static_cast<CustomJpegDestMgr&>(*cinfo->dest);  in CompressYUV420Frame()
275   cinfo->dest = reinterpret_cast<struct jpeg_destination_mgr*>(&dmgr);  in CompressYUV420Frame()
278   cinfo->image_width = frame.width;  in CompressYUV420Frame()
279   cinfo->image_height = frame.height;  in CompressYUV420Frame()
280   cinfo->input_components = 3;  in CompressYUV420Frame()
281   cinfo->in_color_space = JCS_YCbCr;  in CompressYUV420Frame()
283   jpeg_set_defaults(cinfo.get());  in CompressYUV420Frame()
288   jpeg_set_colorspace(cinfo.get(), JCS_YCbCr);  in CompressYUV420Frame()
293   cinfo->raw_data_in = 1;  in CompressYUV420Frame()
295   cinfo->comp_info[0].h_samp_factor = 2;  in CompressYUV420Frame()
296   cinfo->comp_info[0].v_samp_factor = 2;  in CompressYUV420Frame()
297   cinfo->comp_info[1].h_samp_factor = 1;  in CompressYUV420Frame()
298   cinfo->comp_info[1].v_samp_factor = 1;  in CompressYUV420Frame()
299   cinfo->comp_info[2].h_samp_factor = 1;  in CompressYUV420Frame()
300   cinfo->comp_info[2].v_samp_factor = 1;  in CompressYUV420Frame()
302   int max_vsamp_factor = std::max({cinfo->comp_info[0].v_samp_factor,  in CompressYUV420Frame()
303                                    cinfo->comp_info[1].v_samp_factor,  in CompressYUV420Frame()
304                                    cinfo->comp_info[2].v_samp_factor});  in CompressYUV420Frame()
306       cinfo->comp_info[0].v_samp_factor / cinfo->comp_info[1].v_samp_factor;  in CompressYUV420Frame()
309   jpeg_start_compress(cinfo.get(), TRUE);  in CompressYUV420Frame()
315     jpeg_write_marker(cinfo.get(), JPEG_APP0 + 1,  in CompressYUV420Frame()
324   size_t padded_height = mcu_v * ((cinfo->image_height + mcu_v - 1) / mcu_v);  in CompressYUV420Frame()
337     int li = std::min(i, cinfo->image_height - 1);  in CompressYUV420Frame()
340       li = std::min(i, (cinfo->image_height - 1) / c_vsub_sampling);  in CompressYUV420Frame()
349   while (cinfo->next_scanline < cinfo->image_height) {  in CompressYUV420Frame()
350     JSAMPARRAY planes[3]{&y_lines[cinfo->next_scanline],  in CompressYUV420Frame()
351                          &cb_lines[cinfo->next_scanline / c_vsub_sampling],  in CompressYUV420Frame()
352                          &cr_lines[cinfo->next_scanline / c_vsub_sampling]};  in CompressYUV420Frame()
354     jpeg_write_raw_data(cinfo.get(), planes, batch_size);  in CompressYUV420Frame()
361       jpeg_finish_compress(cinfo.get());  in CompressYUV420Frame()
366   jpeg_finish_compress(cinfo.get());  in CompressYUV420Frame()