// so we need some leeway.
expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
}
+
+TEST(YCbCrInput, FullRangeRec601) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 601
+ // section 2.5.4 but without the scaling factors applied
+ // (so both R, G, B, Y, Cb and R vary from 0 to 255).
+ unsigned char y[width * height] = {
+ 0, 255, 76, 150, 29,
+ };
+ unsigned char cb[width * height] = {
+ 128, 128, 85, 44, 255,
+ };
+ unsigned char cr[width * height] = {
+ 128, 128, 255, 21, 107,
+ };
+ float expected_data[4 * width * height] = {
+ 0.0, 0.0, 0.0, 1.0,
+ 1.0, 1.0, 1.0, 1.0,
+ 1.0, 0.0, 0.0, 1.0,
+ 0.0, 1.0, 0.0, 1.0,
+ 0.0, 0.0, 1.0, 1.0,
+ };
+ float out_data[4 * width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = true;
+ ycbcr_format.chroma_subsampling_x = 1;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.chroma_x_position = 0.5f;
+ ycbcr_format.chroma_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
+}
+
+TEST(YCbCrInput, Subsampling420) {
+ const int width = 4;
+ const int height = 4;
+
+ unsigned char y[width * height] = {
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ };
+ unsigned char cb[(width/2) * (height/2)] = {
+ 64, 128,
+ 128, 192,
+ };
+ unsigned char cr[(width/2) * (height/2)] = {
+ 128, 128,
+ 128, 128,
+ };
+
+ // Note: This is only the blue channel. The chroma samples (with associated
+ // values for blue) are marked off in comments.
+ float expected_data[width * height] = {
+ 0.000, 0.125, 0.375, 0.500,
+ /* 0.0 */ /* 0.5 */
+ 0.125, 0.250, 0.500, 0.625,
+
+ 0.375, 0.500, 0.750, 0.875,
+ /* 0.5 */ /* 1.0 */
+ 0.500, 0.625, 0.875, 1.000,
+ };
+ float out_data[width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.chroma_subsampling_x = 2;
+ ycbcr_format.chroma_subsampling_y = 2;
+ ycbcr_format.chroma_x_position = 0.5f;
+ ycbcr_format.chroma_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_BLUE, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, width, height, 0.01, 0.001);
+}
+
+TEST(YCbCrInput, Subsampling420WithNonCenteredSamples) {
+ const int width = 4;
+ const int height = 4;
+
+ unsigned char y[width * height] = {
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ };
+ unsigned char cb[(width/2) * (height/2)] = {
+ 64, 128,
+ 128, 192,
+ };
+ unsigned char cr[(width/2) * (height/2)] = {
+ 128, 128,
+ 128, 128,
+ };
+
+ // Note: This is only the blue channel. The chroma samples (with associated
+ // values for blue) are marked off in comments.
+ float expected_data[width * height] = {
+ 0.000, 0.250, 0.500, 0.500,
+ /* 0.0 */ /* 0.5 */
+ 0.125, 0.375, 0.625, 0.625,
+
+ 0.375, 0.625, 0.875, 0.875,
+ /* 0.5 */ /* 1.0 */
+ 0.500, 0.750, 1.000, 1.000,
+ };
+ float out_data[width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.chroma_subsampling_x = 2;
+ ycbcr_format.chroma_subsampling_y = 2;
+ ycbcr_format.chroma_x_position = 0.0f;
+ ycbcr_format.chroma_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_BLUE, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, width, height, 0.01, 0.001);
+}
projects / movit / blobdiff