Add test cases for AudioStreamWAV

1 files changed, 243 insertions, 0 deletions

diff --git a/tests/scene/test_audio_stream_wav.h b/tests/scene/test_audio_stream_wav.h
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+++ b/tests/scene/test_audio_stream_wav.h
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+/*************************************************************************/
+/*  test_audio_stream_wav.h                                              */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef TEST_AUDIO_STREAM_WAV_H
+#define TEST_AUDIO_STREAM_WAV_H
+
+#include "core/math/math_defs.h"
+#include "core/math/math_funcs.h"
+#include "scene/resources/audio_stream_wav.h"
+
+#include "tests/test_macros.h"
+
+#ifdef TOOLS_ENABLED
+#include "core/io/resource_loader.h"
+#include "editor/import/resource_importer_wav.h"
+#endif
+
+namespace TestAudioStreamWAV {
+
+// Default wav rate for test cases.
+constexpr float WAV_RATE = 44100;
+/* Default wav count for test cases. 1 second of audio is used so that the file can be listened
+to manually if needed. */
+constexpr int WAV_COUNT = WAV_RATE;
+
+float gen_wav(float frequency, float wav_rate, int wav_number) {
+	// formula for generating a sin wave with given frequency.
+	return Math::sin((Math_TAU * frequency / wav_rate) * wav_number);
+}
+
+/* Generates a 440Hz sin wave in channel 0 (mono channel or left stereo channel)
+ * and a 261.63Hz wave in channel 1 (right stereo channel).
+ * These waves correspond to the music notes A4 and C4 respectively.
+ */
+Vector<uint8_t> gen_pcm8_test(float wav_rate, int wav_count, bool stereo) {
+	Vector<uint8_t> buffer;
+	buffer.resize(stereo ? wav_count * 2 : wav_count);
+
+	uint8_t *write_ptr = buffer.ptrw();
+	for (int i = 0; i < buffer.size(); i++) {
+		float wav;
+		if (stereo) {
+			if (i % 2 == 0) {
+				wav = gen_wav(440, wav_rate, i / 2);
+			} else {
+				wav = gen_wav(261.63, wav_rate, i / 2);
+			}
+		} else {
+			wav = gen_wav(440, wav_rate, i);
+		}
+
+		// Map sin wave to full range of 8-bit values.
+		uint8_t wav_8bit = Math::fast_ftoi(((wav + 1) / 2) * UINT8_MAX);
+		// Unlike the .wav format, AudioStreamWAV expects signed 8-bit wavs.
+		uint8_t wav_8bit_signed = wav_8bit - (INT8_MAX + 1);
+		write_ptr[i] = wav_8bit_signed;
+	}
+
+	return buffer;
+}
+
+// Same as gen_pcm8_test but with 16-bit wavs.
+Vector<uint8_t> gen_pcm16_test(float wav_rate, int wav_count, bool stereo) {
+	Vector<uint8_t> buffer;
+	buffer.resize(stereo ? wav_count * 4 : wav_count * 2);
+
+	uint8_t *write_ptr = buffer.ptrw();
+	for (int i = 0; i < buffer.size() / 2; i++) {
+		float wav;
+		if (stereo) {
+			if (i % 2 == 0) {
+				wav = gen_wav(440, wav_rate, i / 2);
+			} else {
+				wav = gen_wav(261.63, wav_rate, i / 2);
+			}
+		} else {
+			wav = gen_wav(440, wav_rate, i);
+		}
+
+		// Map sin wave to full range of 16-bit values.
+		uint16_t wav_16bit = Math::fast_ftoi(((wav + 1) / 2) * UINT16_MAX);
+		// The .wav format expects wavs larger than 8 bits to be signed.
+		uint16_t wav_16bit_signed = wav_16bit - (INT16_MAX + 1);
+		encode_uint16(wav_16bit_signed, write_ptr + (i * 2));
+	}
+
+	return buffer;
+}
+
+void run_test(String file_name, AudioStreamWAV::Format data_format, bool stereo, float wav_rate, float wav_count) {
+	String save_path = OS::get_singleton()->get_cache_path().plus_file(file_name);
+
+	Vector<uint8_t> test_data;
+	if (data_format == AudioStreamWAV::FORMAT_8_BITS) {
+		test_data = gen_pcm8_test(wav_rate, wav_count, stereo);
+	} else {
+		test_data = gen_pcm16_test(wav_rate, wav_count, stereo);
+	}
+
+	Ref<AudioStreamWAV> stream = memnew(AudioStreamWAV);
+	stream->set_mix_rate(wav_rate);
+	CHECK(stream->get_mix_rate() == wav_rate);
+
+	stream->set_format(data_format);
+	CHECK(stream->get_format() == data_format);
+
+	stream->set_stereo(stereo);
+	CHECK(stream->is_stereo() == stereo);
+
+	stream->set_data(test_data);
+	CHECK(stream->get_data() == test_data);
+
+	SUBCASE("Stream length is computed properly") {
+		CHECK(Math::is_equal_approx(stream->get_length(), wav_count / wav_rate));
+	}
+
+	SUBCASE("Stream can be saved as .wav") {
+		REQUIRE(stream->save_to_wav(save_path) == OK);
+
+		Error error;
+		Ref<FileAccess> wav_file = FileAccess::open(save_path, FileAccess::READ, &error);
+		REQUIRE(error == OK);
+
+#if TOOLS_ENABLED
+		// The WAV importer can be used if enabled to check that the saved file is valid.
+		Ref<ResourceImporterWAV> wav_importer = memnew(ResourceImporterWAV);
+
+		List<ResourceImporter::ImportOption> options_list;
+		wav_importer->get_import_options("", &options_list);
+
+		HashMap<StringName, Variant> options_map;
+		for (const ResourceImporter::ImportOption &E : options_list) {
+			options_map[E.option.name] = E.default_value;
+		}
+
+		REQUIRE(wav_importer->import(save_path, save_path, options_map, nullptr) == OK);
+
+		String load_path = save_path + "." + wav_importer->get_save_extension();
+		Ref<AudioStreamWAV> loaded_stream = ResourceLoader::load(load_path, "AudioStreamWAV", ResourceFormatImporter::CACHE_MODE_IGNORE, &error);
+		REQUIRE(error == OK);
+
+		CHECK(loaded_stream->get_format() == stream->get_format());
+		CHECK(loaded_stream->get_loop_mode() == stream->get_loop_mode());
+		CHECK(loaded_stream->get_loop_begin() == stream->get_loop_begin());
+		CHECK(loaded_stream->get_loop_end() == stream->get_loop_end());
+		CHECK(loaded_stream->get_mix_rate() == stream->get_mix_rate());
+		CHECK(loaded_stream->is_stereo() == stream->is_stereo());
+		CHECK(loaded_stream->get_length() == stream->get_length());
+		CHECK(loaded_stream->is_monophonic() == stream->is_monophonic());
+		CHECK(loaded_stream->get_data() == stream->get_data());
+#endif
+	}
+}
+
+TEST_CASE("[AudioStreamWAV] Mono PCM8 format") {
+	run_test("test_pcm8_mono.wav", AudioStreamWAV::FORMAT_8_BITS, false, WAV_RATE, WAV_COUNT);
+}
+
+TEST_CASE("[AudioStreamWAV] Mono PCM16 format") {
+	run_test("test_pcm16_mono.wav", AudioStreamWAV::FORMAT_16_BITS, false, WAV_RATE, WAV_COUNT);
+}
+
+TEST_CASE("[AudioStreamWAV] Stereo PCM8 format") {
+	run_test("test_pcm8_stereo.wav", AudioStreamWAV::FORMAT_8_BITS, true, WAV_RATE, WAV_COUNT);
+}
+
+TEST_CASE("[AudioStreamWAV] Stereo PCM16 format") {
+	run_test("test_pcm16_stereo.wav", AudioStreamWAV::FORMAT_16_BITS, true, WAV_RATE, WAV_COUNT);
+}
+
+TEST_CASE("[AudioStreamWAV] Alternate mix rate") {
+	run_test("test_pcm16_stereo_38000Hz.wav", AudioStreamWAV::FORMAT_16_BITS, true, 38000, 38000);
+}
+
+TEST_CASE("[AudioStreamWAV] save_to_wav() adds '.wav' file extension automatically") {
+	String save_path = OS::get_singleton()->get_cache_path().plus_file("test_wav_extension");
+	Vector<uint8_t> test_data = gen_pcm8_test(WAV_RATE, WAV_COUNT, false);
+	Ref<AudioStreamWAV> stream = memnew(AudioStreamWAV);
+	stream->set_data(test_data);
+
+	REQUIRE(stream->save_to_wav(save_path) == OK);
+	Error error;
+	Ref<FileAccess> wav_file = FileAccess::open(save_path + ".wav", FileAccess::READ, &error);
+	CHECK(error == OK);
+}
+
+TEST_CASE("[AudioStreamWAV] Default values") {
+	Ref<AudioStreamWAV> stream = memnew(AudioStreamWAV);
+	CHECK(stream->get_format() == AudioStreamWAV::FORMAT_8_BITS);
+	CHECK(stream->get_loop_mode() == AudioStreamWAV::LOOP_DISABLED);
+	CHECK(stream->get_loop_begin() == 0);
+	CHECK(stream->get_loop_end() == 0);
+	CHECK(stream->get_mix_rate() == 44100);
+	CHECK(stream->is_stereo() == false);
+	CHECK(stream->get_length() == 0);
+	CHECK(stream->is_monophonic() == false);
+	CHECK(stream->get_data() == Vector<uint8_t>{});
+	CHECK(stream->get_stream_name() == "");
+}
+
+TEST_CASE("[AudioStreamWAV] Save empty file") {
+	run_test("test_empty.wav", AudioStreamWAV::FORMAT_8_BITS, false, WAV_RATE, 0);
+}
+
+TEST_CASE("[AudioStreamWAV] Saving IMA ADPCM is not supported") {
+	String save_path = OS::get_singleton()->get_cache_path().plus_file("test_adpcm.wav");
+	Ref<AudioStreamWAV> stream = memnew(AudioStreamWAV);
+	stream->set_format(AudioStreamWAV::FORMAT_IMA_ADPCM);
+	ERR_PRINT_OFF;
+	CHECK(stream->save_to_wav(save_path) == ERR_UNAVAILABLE);
+	ERR_PRINT_ON;
+}
+
+} // namespace TestAudioStreamWAV
+
+#endif // TEST_AUDIO_STREAM_WAV_H