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glcolorconvert: add RGB to NV12/NV21 conversion

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This commit is contained in:
Matthew Waters 2015-07-21 15:39:35 +10:00
parent 2b7542400c
commit b3357754c1
1 changed files with 43 additions and 0 deletions
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43
gst-libs/gst/gl/gstglcolorconvert.c
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@ -320,6 +320,35 @@ static const char frag_NV12_NV21_to_RGB[] = {
"}"
};
/* RGB to NV12/NV21 conversion */
/* NV12: u, v
NV21: v, u */
static const char frag_RGB_to_NV12_NV21[] = {
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"varying vec2 v_texcoord;\n"
"uniform sampler2D tex;\n"
"uniform vec2 tex_scale0;\n"
"uniform vec2 tex_scale1;\n"
"uniform vec2 tex_scale2;\n"
RGB_TO_YUV_COEFFICIENTS
"void main(void) {\n"
" float y, u, v;\n"
" vec4 texel, uv_texel;\n"
" texel = texture2D(tex, v_texcoord * tex_scale0).%c%c%c%c;\n"
" uv_texel = texture2D(tex, v_texcoord * tex_scale0 * 2.0).%c%c%c%c;\n"
" y = dot(texel.rgb, coeff1);\n"
" u = dot(uv_texel.rgb, coeff2);\n"
" v = dot(uv_texel.rgb, coeff3);\n"
" y += offset.x;\n"
" u += offset.y;\n"
" v += offset.z;\n"
" gl_FragData[0] = vec4(y, 0.0, 0.0, 1.0);\n"
" gl_FragData[1] = vec4(%c, %c, 0.0, 1.0);\n"
"}"
};
/* YUY2:r,g,a
UYVY:a,b,r */
static const gchar frag_YUY2_UYVY_to_RGB[] =
@ -1128,6 +1157,20 @@ _RGB_to_YUV (GstGLColorConvert * convert)
"u", "y", "v", "y");
info->out_n_textures = 1;
break;
case GST_VIDEO_FORMAT_NV12:
info->frag_prog = g_strdup_printf (frag_RGB_to_NV12_NV21,
pixel_order[0], pixel_order[1], pixel_order[2], pixel_order[3],
pixel_order[0], pixel_order[1], pixel_order[2], pixel_order[3],
'u', 'v');
info->out_n_textures = 2;
break;
case GST_VIDEO_FORMAT_NV21:
info->frag_prog = g_strdup_printf (frag_RGB_to_NV12_NV21,
pixel_order[0], pixel_order[1], pixel_order[2], pixel_order[3],
pixel_order[0], pixel_order[1], pixel_order[2], pixel_order[3],
'v', 'u');
info->out_n_textures = 2;
break;
default:
break;
}