// Unit tests for YCbCrInput.
// FIXME: This class really ought to support mipmaps.
+#include <GL/glew.h>
#include <stddef.h>
#include "effect_chain.h"
#include "gtest/gtest.h"
#include "test_util.h"
+#include "util.h"
#include "ycbcr_input.h"
+namespace movit {
+
TEST(YCbCrInput, Simple444) {
const int width = 1;
const int height = 5;
expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
}
+TEST(YCbCrInput, Rec2020) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 2020
+ // page 4, tables 4 and 5 (for conventional non-constant luminance).
+ // Note that we still use 8-bit inputs, even though Rec. 2020 is only
+ // defined for 10- and 12-bit.
+ unsigned char y[width * height] = {
+ 16, 235, 74, 164, 29,
+ };
+ unsigned char cb[width * height] = {
+ 128, 128, 97, 47, 240,
+ };
+ unsigned char cr[width * height] = {
+ 128, 128, 240, 25, 119,
+ };
+ 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_2020;
+ ycbcr_format.full_range = false;
+ ycbcr_format.chroma_subsampling_x = 1;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_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;
tester.run(out_data, GL_BLUE, COLORSPACE_sRGB, GAMMA_sRGB);
expect_equal(expected_data_blue, out_data, width, height, 0.01, 0.001);
}
+
+TEST(YCbCrInput, PBO) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 601
+ // section 2.5.4.
+ unsigned char data[width * height * 3] = {
+ 16, 235, 81, 145, 41,
+ 128, 128, 90, 54, 240,
+ 128, 128, 240, 34, 110,
+ };
+ 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];
+
+ GLuint pbo;
+ glGenBuffers(1, &pbo);
+ glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
+ glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, width * height * 3, data, GL_STREAM_DRAW);
+ glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
+
+ 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 = 1;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, (unsigned char *)BUFFER_OFFSET(0), pbo);
+ input->set_pixel_data(1, (unsigned char *)BUFFER_OFFSET(width * height), pbo);
+ input->set_pixel_data(2, (unsigned char *)BUFFER_OFFSET(width * height * 2), pbo);
+ 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);
+
+ glDeleteBuffers(1, &pbo);
+}
+
+} // namespace movit