Implemented SDL_Audio as an AudioInterface

include/polycode/core/PolySDLAudioInterface.h

@@ -0,0 +1,48 @@
+/*
+	Copyright (C) 2016 by Sang Hak Chun
+
+	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.
+*/
+
+#pragma once
+
+#include "polycode/core/PolyGlobals.h"
+#include "polycode/core/PolySoundManager.h"
+
+#include <SDL/SDL_audio.h>
+#include <stdlib.h>
+
+#define SDL_AUDIO_NUM_OF_SAMPLES 8192
+
+namespace Polycode {
+
+	class SDLAudioInterface : public Polycode::AudioInterface {
+		public:
+			SDLAudioInterface();
+			~SDLAudioInterface();
+
+			static void sdlCallback(void* userData, Uint8* _stream, int _length);
+		private:
+			SDL_AudioSpec *desired;
+			SDL_AudioSpec *obtained;
+
+			int16_t* buffer;
+	};
+
+}

src/core/PolySDLAudioInterface.cpp

@@ -0,0 +1,66 @@
+/*
+	Copyright (C) 2016 by Sang Hak Chun
+
+	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.
+*/
+
+#include "polycode/core/PolySDLAudioInterface.h"
+#include "polycode/core/PolyLogger.h"
+
+using namespace Polycode;
+
+SDLAudioInterface::SDLAudioInterface() {
+	desired = (SDL_AudioSpec*) malloc(sizeof(SDL_AudioSpec));
+	obtained = (SDL_AudioSpec*) malloc(sizeof(SDL_AudioSpec));
+
+	desired->freq = POLY_AUDIO_FREQ;
+	desired->format = AUDIO_S16SYS;
+	desired->channels = POLY_NUM_CHANNELS;
+	desired->samples = SDL_AUDIO_NUM_OF_SAMPLES;
+	desired->callback = SDLAudioInterface::sdlCallback;
+	desired->userdata = this;
+
+	int error = SDL_OpenAudio(desired, obtained);
+
+	if (error < 0) {
+		Logger::log("Error opening SDL_audio stream\n");
+	}
+
+	free(desired);
+
+	buffer = (int16_t*) malloc(sizeof(int16_t) * POLY_FRAMES_PER_BUFFER * POLY_NUM_CHANNELS);
+
+	SDL_PauseAudio(0); // start playing
+}
+
+SDLAudioInterface::~SDLAudioInterface() {
+	SDL_CloseAudio();
+	free(buffer);
+}
+
+void SDLAudioInterface::sdlCallback(void *userData, Uint8 *_stream, int _length) {
+	if ( _length == 0 )
+		return;
+
+	memset(_stream, 0, _length);
+	SDLAudioInterface *audioInterface = (SDLAudioInterface*) userData;
+	if(_stream && audioInterface->getMixer()) {
+		audioInterface->getMixer()->mixIntoBuffer((int16_t*)_stream, (_length / (sizeof(int16_t) * POLY_NUM_CHANNELS)));
+	}
+};