detect BT 601 SD or BT 709 HD, ebook
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// (C) 2011 Jan-Willem Krans (janwillem32 <at> hotmail.com)// This file is part of Video pixel shader pack.// This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.// You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.// detect BT.601 [SD] or BT.709 [HD]// This shader can be run as a screen space pixel shader.// If possible, avoid compiling with the software emulation modes (ps_?_sw). Pixel shaders require a lot of processing power to run in real-time software mode.// This shader will detect HD and SD resolutions.// The lowest HD resolution frame is defined as 1280?720, aspect ratio 9/16.// The standard allows up to 1/8 to be lost due to overscan for both width and height; 1280*7/8=1120 & 720*7/8=630// The lowest aspect ratio is 1/2.40, height is then limited; floor(1120/2.40)=466// The highest aspect ratio is 3/4=.75, width is then limited; floor(630/.75)=840// The detection rule for HD must apply for both 1120?466 and 840?630 resolutions.float2 c0;float4 main() : COLOR{if(c0.x < 1120 && c0.y < 630) return float4(0, 0, 1, 1);// SD, blue outputreturn float4(1, 0, 0, 1);// HD, red output}
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