usbloadergx/source/SoundOperations/SoundHandler.cpp

/***************************************************************************
 * Copyright (C) 2010
 * by Dimok
 *
 * 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.
 *
 * for WiiXplorer 2010
 ***************************************************************************/
#include <unistd.h>
#include <malloc.h>
#include "SoundHandler.hpp"
#include "Mp3Decoder.hpp"
#include "OggDecoder.hpp"
#include "WavDecoder.hpp"
#include "AifDecoder.hpp"
#include "BNSDecoder.hpp"

SoundHandler * SoundHandler::instance = NULL;

SoundHandler::SoundHandler()
{
    Decoding = false;
    ExitRequested = false;
	for(u32 i = 0; i < MAX_DECODERS; ++i)
        DecoderList[i] = NULL;

    ThreadStack = (u8 *) memalign(32, 32768);
	if(!ThreadStack)
        return;

	LWP_CreateThread(&SoundThread, UpdateThread, this, ThreadStack, 32768, 80);
}

SoundHandler::~SoundHandler()
{
	ExitRequested = true;
	ThreadSignal();
	LWP_JoinThread(SoundThread, NULL);
	SoundThread = LWP_THREAD_NULL;
	if(ThreadStack)
        free(ThreadStack);

	ClearDecoderList();
}

SoundHandler * SoundHandler::Instance()
{
	if (instance == NULL)
	{
		instance = new SoundHandler();
	}
	return instance;
}

void SoundHandler::DestroyInstance()
{
    if(instance)
    {
        delete instance;
    }
    instance = NULL;
}

void SoundHandler::AddDecoder(int voice, const char * filepath)
{
    if(voice < 0 || voice >= MAX_DECODERS)
        return;

    if(DecoderList[voice] != NULL)
        RemoveDecoder(voice);

    DecoderList[voice] = GetSoundDecoder(filepath);
}

void SoundHandler::AddDecoder(int voice, const u8 * snd, int len)
{
    if(voice < 0 || voice >= MAX_DECODERS)
        return;

    if(DecoderList[voice] != NULL)
        RemoveDecoder(voice);

    DecoderList[voice] = GetSoundDecoder(snd, len);
}

void SoundHandler::RemoveDecoder(int voice)
{
    if(voice < 0 || voice >= MAX_DECODERS)
        return;

    if(DecoderList[voice] != NULL)
    	delete DecoderList[voice];

    DecoderList[voice] = NULL;
}

void SoundHandler::ClearDecoderList()
{
    for(u32 i = 0; i < MAX_DECODERS; ++i)
        RemoveDecoder(i);
}

static inline bool CheckMP3Signature(const u8 * buffer)
{
    const char MP3_Magic[][3] =
    {
        {'I', 'D', '3'},    //'ID3'
        {0xff, 0xfe},       //'MPEG ADTS, layer III, v1.0 [protected]', 'mp3', 'audio/mpeg'),
        {0xff, 0xff},       //'MPEG ADTS, layer III, v1.0', 'mp3', 'audio/mpeg'),
        {0xff, 0xfa},       //'MPEG ADTS, layer III, v1.0 [protected]', 'mp3', 'audio/mpeg'),
        {0xff, 0xfb},       //'MPEG ADTS, layer III, v1.0', 'mp3', 'audio/mpeg'),
        {0xff, 0xf2},       //'MPEG ADTS, layer III, v2.0 [protected]', 'mp3', 'audio/mpeg'),
        {0xff, 0xf3},       //'MPEG ADTS, layer III, v2.0', 'mp3', 'audio/mpeg'),
        {0xff, 0xf4},       //'MPEG ADTS, layer III, v2.0 [protected]', 'mp3', 'audio/mpeg'),
        {0xff, 0xf5},       //'MPEG ADTS, layer III, v2.0', 'mp3', 'audio/mpeg'),
        {0xff, 0xf6},       //'MPEG ADTS, layer III, v2.0 [protected]', 'mp3', 'audio/mpeg'),
        {0xff, 0xf7},       //'MPEG ADTS, layer III, v2.0', 'mp3', 'audio/mpeg'),
        {0xff, 0xe2},       //'MPEG ADTS, layer III, v2.5 [protected]', 'mp3', 'audio/mpeg'),
        {0xff, 0xe3},       //'MPEG ADTS, layer III, v2.5', 'mp3', 'audio/mpeg'),
    };

    if(buffer[0] == MP3_Magic[0][0] && buffer[1] == MP3_Magic[0][1] &&
       buffer[2] == MP3_Magic[0][2])
    {
        return true;
    }

    for(int i = 1; i < 13; i++)
    {
        if(buffer[0] == MP3_Magic[i][0] && buffer[1] == MP3_Magic[i][1])
            return true;
    }

    return false;
}

SoundDecoder * SoundHandler::GetSoundDecoder(const char * filepath)
{
    u32 magic;
    CFile f(filepath, "rb");
    if(f.size() == 0)
        return NULL;

    do
    {
        f.read((u8 *) &magic, 1);
    }
    while(((u8 *) &magic)[0] == 0 && f.tell() < f.size());

    if(f.tell() == f.size())
        return NULL;

    f.seek(f.tell()-1, SEEK_SET);
    f.read((u8 *) &magic, 4);
    f.close();

    if(magic == 'OggS')
    {
        return new OggDecoder(filepath);
    }
    else if(magic == 'RIFF')
    {
        return new WavDecoder(filepath);
    }
    else if(magic == 'BNS ')
    {
        return new BNSDecoder(filepath);
    }
    else if(magic == 'FORM')
    {
        return new AifDecoder(filepath);
    }
    else if(CheckMP3Signature((u8 *) &magic) == true)
    {
        return new Mp3Decoder(filepath);
    }

    return new SoundDecoder(filepath);
}

SoundDecoder * SoundHandler::GetSoundDecoder(const u8 * sound, int length)
{
    const u8 * check = sound;
    int counter = 0;

    while(check[0] == 0 && counter < length)
    {
        check++;
        counter++;
    }

    if(counter >= length)
        return NULL;

    u32 * magic = (u32 *) check;

    if(magic[0] == 'OggS')
    {
        return new OggDecoder(sound, length);
    }
    else if(magic[0] == 'RIFF')
    {
        return new WavDecoder(sound, length);
    }
    else if(magic[0] == 'BNS ')
    {
        return new BNSDecoder(sound, length);
    }
    else if(magic[0] == 'FORM')
    {
        return new AifDecoder(sound, length);
    }
    else if(CheckMP3Signature(check) == true)
    {
        return new Mp3Decoder(sound, length);
    }

    return new SoundDecoder(sound, length);
}

void * SoundHandler::UpdateThread(void *arg)
{
	((SoundHandler *) arg)->InternalSoundUpdates();
	return NULL;
}

void SoundHandler::InternalSoundUpdates()
{
    u16 i = 0;
	LWP_InitQueue(&ThreadQueue);
	while (!ExitRequested)
	{
        LWP_ThreadSleep(ThreadQueue);

	    for(i = 0; i < MAX_DECODERS; ++i)
	    {
	        if(DecoderList[i] == NULL)
                continue;

            Decoding = true;
            DecoderList[i]->Decode();
	    }
	    Decoding = false;
	}
    LWP_CloseQueue(ThreadQueue);
    ThreadQueue = LWP_TQUEUE_NULL;
}