love2d.love/src/modules/sound/lullaby/ModPlugDecoder.cpp

/**
 * Copyright (c) 2006-2013 LOVE Development Team
 *
 * 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 "common/config.h"
#include "ModPlugDecoder.h"

#include "common/Exception.h"

namespace love
{
namespace sound
{
namespace lullaby
{

ModPlugDecoder::ModPlugDecoder(Data *data, const std::string &ext, int bufferSize)
	: Decoder(data, ext, bufferSize)
	, plug(0)
{

	// Set some ModPlug settings.
	settings.mFlags = MODPLUG_ENABLE_OVERSAMPLING | MODPLUG_ENABLE_NOISE_REDUCTION;
	settings.mChannels = 2;
	settings.mBits = 16;
	settings.mFrequency = sampleRate;
	settings.mResamplingMode = MODPLUG_RESAMPLE_LINEAR;

	// fill with modplug defaults (modplug _memsets_, so we could get
	// garbage settings when the struct is only partially initialized)
	// This does not exist yet on Windows.

	// Some settings not supported by some older versions
#ifndef LOVE_OLD_MODPLUG
	settings.mStereoSeparation = 128;
	settings.mMaxMixChannels = 32;
#endif
	settings.mReverbDepth = 0;
	settings.mReverbDelay = 0;
	settings.mBassAmount = 0;
	settings.mBassRange = 0;
	settings.mSurroundDepth = 0;
	settings.mSurroundDelay = 0;
	settings.mLoopCount = -1;

	ModPlug_SetSettings(&settings);

	// Load the module.
	plug = ModPlug_Load(data->getData(), data->getSize());

	if (plug == 0)
		throw love::Exception("Could not load file with ModPlug.");

	// set master volume for delicate ears
	ModPlug_SetMasterVolume(plug, 128);
}

ModPlugDecoder::~ModPlugDecoder()
{
	if (plug != 0)
		ModPlug_Unload(plug);
}

bool ModPlugDecoder::accepts(const std::string &ext)
{
	static const std::string supported[] =
	{
		"699", "abc", "amf", "ams", "dbm", "dmf",
		"dsm", "far", "it", "j2b", "mdl", "med",
		"mid", "mod", "mt2", "mtm", "okt", "pat",
		"psm", "s3m", "stm", "ult", "umx", "wav",
		"xm", ""
	};

	for (int i = 0; !(supported[i].empty()); i++)
	{
		if (supported[i].compare(ext) == 0)
			return true;
	}

	return false;
}

love::sound::Decoder *ModPlugDecoder::clone()
{
	return new ModPlugDecoder(data, ext, bufferSize);
}

int ModPlugDecoder::decode()
{
	int r =  ModPlug_Read(plug, buffer, bufferSize);

	if (r == 0)
		eof = true;

	return r;
}

bool ModPlugDecoder::seek(float s)
{
	ModPlug_Seek(plug, (int)(s*1000.0f));
	return true;
}

bool ModPlugDecoder::rewind()
{
	// Let's reload.
	ModPlug_Unload(plug);
	plug = ModPlug_Load(data->getData(), data->getSize());
	ModPlug_SetMasterVolume(plug, 128);
	eof = false;
	return (plug != 0);
}

bool ModPlugDecoder::isSeekable()
{
	return true;
}

int ModPlugDecoder::getChannels() const
{
	return 2;
}

int ModPlugDecoder::getBitDepth() const
{
	return 16;
}

} // lullaby
} // sound
} // love