// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright The Music Player Daemon Project

#include "pcm/Interleave.hxx"

#include <gtest/gtest.h>

#include <algorithm>

template<typename T>
static void
TestInterleaveN()
{
	static constexpr T src1[] = { 1, 4, 7 };
	static constexpr T src2[] = { 2, 5, 8 };
	static constexpr T src3[] = { 3, 6, 9 };
	static constexpr const T *src_all[] = { src1, src2, src3 };

	static constexpr size_t n_frames = std::size(src1);
	static constexpr unsigned channels = std::size(src_all);

	static const std::span<const void *const> src{
		(const void *const*)src_all,
		channels,
	};

	static constexpr T poison = T(0xdeadbeef);
	T dest[n_frames * channels + 1];
	std::fill_n(dest, std::size(dest), poison);

	PcmInterleave(dest, src, n_frames, sizeof(T));

	EXPECT_EQ(T(1), dest[0]);
	EXPECT_EQ(T(2), dest[1]);
	EXPECT_EQ(T(3), dest[2]);
	EXPECT_EQ(T(4), dest[3]);
	EXPECT_EQ(T(5), dest[4]);
	EXPECT_EQ(T(6), dest[5]);
	EXPECT_EQ(T(7), dest[6]);
	EXPECT_EQ(T(8), dest[7]);
	EXPECT_EQ(T(9), dest[8]);
	EXPECT_EQ(poison, dest[9]);
}

TEST(PcmTest, Interleave8)
{
	TestInterleaveN<uint8_t>();
}

TEST(PcmTest, Interleave16)
{
	TestInterleaveN<uint16_t>();
}

TEST(PcmTest, Interleave24)
{
	using T = uint8_t;
	static constexpr T src1[] = { 1, 2, 3, 4, 5, 6 };
	static constexpr T src2[] = { 7, 8, 9, 10, 11, 12 };
	static constexpr T src3[] = { 13, 14, 15, 16, 17, 18 };
	static constexpr const T *src_all[] = { src1, src2, src3 };

	static constexpr size_t n_frames = std::size(src1) / 3;
	static constexpr unsigned channels = std::size(src_all);

	static const std::span<const void *const> src{
		(const void *const*)src_all,
		channels,
	};

	static constexpr T poison = 0xff;
	T dest[n_frames * channels * 3 + 1];
	std::fill_n(dest, std::size(dest), poison);

	PcmInterleave(dest, src, n_frames, 3);

	EXPECT_EQ(T(1), dest[0]);
	EXPECT_EQ(T(2), dest[1]);
	EXPECT_EQ(T(3), dest[2]);
	EXPECT_EQ(T(7), dest[3]);
	EXPECT_EQ(T(8), dest[4]);
	EXPECT_EQ(T(9), dest[5]);
	EXPECT_EQ(T(13), dest[6]);
	EXPECT_EQ(T(14), dest[7]);
	EXPECT_EQ(T(15), dest[8]);
	EXPECT_EQ(T(4), dest[9]);
	EXPECT_EQ(T(5), dest[10]);
	EXPECT_EQ(T(6), dest[11]);
	EXPECT_EQ(T(10), dest[12]);
	EXPECT_EQ(T(11), dest[13]);
	EXPECT_EQ(T(12), dest[14]);
	EXPECT_EQ(T(16), dest[15]);
	EXPECT_EQ(T(17), dest[16]);
	EXPECT_EQ(T(18), dest[17]);
	EXPECT_EQ(poison, dest[18]);

	TestInterleaveN<uint16_t>();
}

TEST(PcmTest, Interleave32)
{
	TestInterleaveN<uint8_t>();
}

TEST(PcmTest, Interleave64)
{
	TestInterleaveN<uint64_t>();
}