mpd/test/test_pcm_channels.cxx

/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "test_pcm_all.hxx"
#include "test_pcm_util.hxx"
#include "PcmChannels.hxx"
#include "pcm_buffer.h"

#include <glib.h>

void
test_pcm_channels_16()
{
	constexpr unsigned N = 256;
	const auto src = TestDataBuffer<int16_t, N * 2>();

	struct pcm_buffer buffer;
	pcm_buffer_init(&buffer);

	/* stereo to mono */

	size_t dest_size;
	const int16_t *dest =
		pcm_convert_channels_16(&buffer, 1, 2, src, sizeof(src),
					&dest_size);
	g_assert(dest != NULL);
	g_assert_cmpint(dest_size, ==, sizeof(src) / 2);
	for (unsigned i = 0; i < N; ++i)
		g_assert_cmpint(dest[i], ==,
				(src[i * 2] + src[i * 2 + 1]) / 2);

	/* mono to stereo */

	dest = pcm_convert_channels_16(&buffer, 2, 1, src, sizeof(src),
				       &dest_size);
	g_assert(dest != NULL);
	g_assert_cmpint(dest_size, ==, sizeof(src) * 2);
	for (unsigned i = 0; i < N; ++i) {
		g_assert_cmpint(dest[i * 2], ==, src[i]);
		g_assert_cmpint(dest[i * 2 + 1], ==, src[i]);
	}

	pcm_buffer_deinit(&buffer);
}

void
test_pcm_channels_32()
{
	constexpr unsigned N = 256;
	const auto src = TestDataBuffer<int32_t, N * 2>();

	struct pcm_buffer buffer;
	pcm_buffer_init(&buffer);

	/* stereo to mono */

	size_t dest_size;
	const int32_t *dest =
		pcm_convert_channels_32(&buffer, 1, 2, src, sizeof(src),
					&dest_size);
	g_assert(dest != NULL);
	g_assert_cmpint(dest_size, ==, sizeof(src) / 2);
	for (unsigned i = 0; i < N; ++i)
		g_assert_cmpint(dest[i], ==,
				((int64_t)src[i * 2] + (int64_t)src[i * 2 + 1]) / 2);

	/* mono to stereo */

	dest = pcm_convert_channels_32(&buffer, 2, 1, src, sizeof(src),
				       &dest_size);
	g_assert(dest != NULL);
	g_assert_cmpint(dest_size, ==, sizeof(src) * 2);
	for (unsigned i = 0; i < N; ++i) {
		g_assert_cmpint(dest[i * 2], ==, src[i]);
		g_assert_cmpint(dest[i * 2 + 1], ==, src[i]);
	}

	pcm_buffer_deinit(&buffer);
}