Add demo for wav loading and playing

demos/CMakeLists.txt

@@ -12,6 +12,9 @@ TARGET_LINK_LIBRARIES(rendertarget SDL2pp)
 ADD_EXECUTABLE(audio_sine audio_sine.cc)
 TARGET_LINK_LIBRARIES(audio_sine SDL2pp)
 
+ADD_EXECUTABLE(audio_wav audio_wav.cc)
+TARGET_LINK_LIBRARIES(audio_wav SDL2pp)
+
 IF(SDL2PP_WITH_IMAGE)
 	ADD_EXECUTABLE(image image.cc)
 	TARGET_LINK_LIBRARIES(image SDL2pp)

demos/audio_wav.cc

@@ -0,0 +1,83 @@
+/*
+  libSDL2pp - C++ wrapper for libSDL2
+  Copyright (C) 2013-2014 Dmitry Marakasov <amdmi3@amdmi3.ru>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include <iostream>
+#include <stdexcept>
+
+#include <SDL2/SDL.h>
+
+#include <SDL2pp/SDL2pp.hh>
+
+using namespace SDL2pp;
+
+int Run() {
+	SDL sdl(SDL_INIT_AUDIO);
+
+	Wav wav(TESTDATA_DIR "/test.wav");
+
+	// Setup audio device, and provide callback which plays looped wave sound
+	Uint8* wav_pos = wav.GetBuffer();
+	AudioSpec spec(wav.GetSpec(), [&wav, &wav_pos](Uint8* stream, int len) {
+				// Fill provided buffer with wave contents
+				Uint8* stream_pos = stream;
+				Uint8* stream_end = stream + len;
+
+				while (stream_pos < stream_end) {
+					Uint8* wav_end = wav.GetBuffer() + wav.GetLength();
+
+					int copylen = std::min(wav_end - wav_pos, stream_end - stream_pos);
+
+					std::copy(wav_pos, wav_pos + copylen, stream_pos);
+					stream_pos += copylen;
+					wav_pos += copylen;
+					if (wav_pos >= wav_end)
+						wav_pos = wav.GetBuffer();
+				}
+			}
+		);
+
+	// Open audio device
+	AudioDevice dev("", 0, spec);
+
+	// Ensure SDL has set up format conversion for us
+	if (!spec.IsSameFormat(wav.GetSpec()))
+		throw std::runtime_error("WAV format is not the same as output format");
+
+	// Sound plays after this call
+	dev.Pause(false);
+
+	// Play for 5 seconds, after which everything is stopped and closed
+	SDL_Delay(5000);
+
+	return 0;
+}
+
+int main() {
+	try {
+		return Run();
+	} catch (Exception& e) {
+		std::cerr << "Error: " << e.what() << " (" << e.GetSDLError() << ")" << std::endl;
+	} catch (std::exception& e) {
+		std::cerr << "Error: " << e.what() << std::endl;
+	}
+
+	return -1;
+}

testdata/README.md

@@ -0,0 +1,5 @@
+Some test data was taken from third party sources:
+
+* ```test.wav``` is (C) CC-by Martin "JaZzy Jun69le" Pesek
+  * https://www.freesound.org/people/junggle/sounds/30341/
+  * http://profiles.google.com/jun66le