mirror of
https://github.com/qTox/qTox.git
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55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
/*
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This file is part of qTox, a Qt-based graphical interface for Tox.
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This program is libre software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the COPYING file for more details.
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*/
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#include "videoframe.h"
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vpx_image_t VideoFrame::createVpxImage() const
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{
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vpx_image img;
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img.w = img.h = img.d_w = img.d_h = 0;
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if (!isValid())
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return img;
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const int w = resolution.width();
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const int h = resolution.height();
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// I420 "It comprises an NxM Y plane followed by (N/2)x(M/2) V and U planes."
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// http://fourcc.org/yuv.php#IYUV
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vpx_img_alloc(&img, VPX_IMG_FMT_VPXI420, w, h, 1);
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for (int y = 0; y < h; ++y)
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{
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for (int x = 0; x < w; ++x)
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{
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uint8_t b = frameData.data()[(x + y * w) * 3 + 0];
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uint8_t g = frameData.data()[(x + y * w) * 3 + 1];
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uint8_t r = frameData.data()[(x + y * w) * 3 + 2];
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img.planes[VPX_PLANE_Y][x + y * img.stride[VPX_PLANE_Y]] = ((66 * r + 129 * g + 25 * b) >> 8) + 16;
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if (!(x % (1 << img.x_chroma_shift)) && !(y % (1 << img.y_chroma_shift)))
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{
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const int i = x / (1 << img.x_chroma_shift);
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const int j = y / (1 << img.y_chroma_shift);
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img.planes[VPX_PLANE_V][i + j * img.stride[VPX_PLANE_V]] = ((112 * r + -94 * g + -18 * b) >> 8) + 128;
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img.planes[VPX_PLANE_U][i + j * img.stride[VPX_PLANE_U]] = ((-38 * r + -74 * g + 112 * b) >> 8) + 128;
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}
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}
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}
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return img;
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}
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