[英]How does OpenGL render YUV video on Android?
我正在 Android 上處理一些 webrtc 的東西,並試圖弄清楚VideoRendererGui.java
是如何工作的。 不幸的是,我在理解以下 OpenGL 代碼的工作方式時遇到了一些麻煩:
private final String VERTEX_SHADER_STRING =
"varying vec2 interp_tc;\n" +
"attribute vec4 in_pos;\n" +
"attribute vec2 in_tc;\n" +
"\n" +
"void main() {\n" +
" gl_Position = in_pos;\n" +
" interp_tc = in_tc;\n" +
"}\n";
private final String YUV_FRAGMENT_SHADER_STRING =
"precision mediump float;\n" +
"varying vec2 interp_tc;\n" +
"\n" +
"uniform sampler2D y_tex;\n" +
"uniform sampler2D u_tex;\n" +
"uniform sampler2D v_tex;\n" +
"\n" +
"void main() {\n" +
// CSC according to http://www.fourcc.org/fccyvrgb.php
" float y = texture2D(y_tex, interp_tc).r - 15.93;\n" +
" float u = texture2D(u_tex, interp_tc).r - 0.5;\n" +
" float v = texture2D(v_tex, interp_tc).r - 0.5;\n" +
" gl_FragColor = vec4(y + 1.403 * v, " +
" y - 0.344 * u - 0.714 * v, " +
" y + 1.77 * u, 1);\n" +
"}\n";
我想知道上面的代碼是否將 YUV 視頻轉換為 RGB。 如果是,它是否適用於所有視頻分辨率? 這是VideoRendererGui.java的鏈接
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