usbloadergx/source/SoundOperations/AifDecoder.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 <string.h>
#include <math.h>
#include "AifDecoder.hpp"

typedef struct
{
	u32 fccCOMM;
	u32 size;
	u16 channels;
	u8 frames[4];
	u16 bps;
	u8 freq[10];
} SAIFFCommChunk;

typedef struct
{
	u32 fccSSND;
	u32 size;
	u32 offset;
	u32 blockSize;
} SAIFFSSndChunk;

// ------
// Copyright (C) 1988-1991 Apple Computer, Inc.
#ifndef HUGE_VAL
# define HUGE_VAL HUGE
#endif

# define UnsignedToFloat(u)         (((double)((long)(u - 2147483647L - 1))) + 2147483648.0)

static double ConvertFromIeeeExtended(const unsigned char* bytes)
{
    double    f;
    int    expon;
    unsigned long hiMant, loMant;

    expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
    hiMant    =    ((unsigned long)(bytes[2] & 0xFF) << 24)
            |    ((unsigned long)(bytes[3] & 0xFF) << 16)
            |    ((unsigned long)(bytes[4] & 0xFF) << 8)
            |    ((unsigned long)(bytes[5] & 0xFF));
    loMant    =    ((unsigned long)(bytes[6] & 0xFF) << 24)
            |    ((unsigned long)(bytes[7] & 0xFF) << 16)
            |    ((unsigned long)(bytes[8] & 0xFF) << 8)
            |    ((unsigned long)(bytes[9] & 0xFF));

    if (expon == 0 && hiMant == 0 && loMant == 0) {
        f = 0;
    }
    else {
        if (expon == 0x7FFF) {
            f = HUGE_VAL;
        }
        else {
            expon -= 16383;
            f  = ldexp(UnsignedToFloat(hiMant), expon-=31);
            f += ldexp(UnsignedToFloat(loMant), expon-=32);
        }
    }

    if (bytes[0] & 0x80)
        return -f;
    else
        return f;
}

AifDecoder::AifDecoder(const char * filepath)
    : SoundDecoder(filepath)
{
    SoundType = SOUND_AIF;

    if(!file_fd)
        return;

    OpenFile();
}

AifDecoder::AifDecoder(const u8 * snd, int len)
    : SoundDecoder(snd, len)
{
    SoundType = SOUND_AIF;

    if(!file_fd)
        return;

    OpenFile();
}

AifDecoder::~AifDecoder()
{
}

void AifDecoder::OpenFile()
{
    SWaveHdr Header;
    file_fd->read((u8 *) &Header, sizeof(SWaveHdr));

	if (Header.magicRIFF != 'FORM')
	{
		CloseFile();
		return;
	}
	else if(Header.magicWAVE != 'AIFF')
	{
		CloseFile();
		return;
	}

	SWaveChunk WaveChunk;
	do
	{
        int ret = file_fd->read((u8 *) &WaveChunk, sizeof(SWaveChunk));
        if(ret <= 0)
        {
            CloseFile();
            return;
        }
	}
	while(WaveChunk.magicDATA != 'COMM');

    DataOffset = file_fd->tell()+WaveChunk.size;

    SAIFFCommChunk CommHdr;
    file_fd->seek(file_fd->tell()-sizeof(SWaveChunk), SEEK_SET);
    file_fd->read((u8 *) &CommHdr, sizeof(SAIFFCommChunk));

	if(CommHdr.fccCOMM != 'COMM')
	{
		CloseFile();
		return;
	}

    file_fd->seek(DataOffset, SEEK_SET);

    SAIFFSSndChunk SSndChunk;
    file_fd->read((u8 *) &SSndChunk, sizeof(SAIFFSSndChunk));

    if(SSndChunk.fccSSND != 'SSND')
	{
		CloseFile();
		return;
	}

	DataOffset += sizeof(SAIFFSSndChunk);
	DataSize = SSndChunk.size-8;
	SampleRate = (u32) ConvertFromIeeeExtended(CommHdr.freq);
    Format = VOICE_STEREO_16BIT;

	if(CommHdr.channels == 1 && CommHdr.bps == 8)
		Format = VOICE_MONO_8BIT;
	else if (CommHdr.channels == 1 && CommHdr.bps == 16)
		Format = VOICE_MONO_16BIT;
	else if (CommHdr.channels == 2 && CommHdr.bps == 8)
		Format = VOICE_STEREO_8BIT;
	else if (CommHdr.channels == 2 && CommHdr.bps == 16)
		Format = VOICE_STEREO_16BIT;

    Decode();
}

void AifDecoder::CloseFile()
{
    if(file_fd)
        delete file_fd;

    file_fd = NULL;
}

int AifDecoder::Read(u8 * buffer, int buffer_size, int pos)
{
    if(!file_fd)
        return -1;

    if(CurPos >= (int) DataSize)
        return 0;

    file_fd->seek(DataOffset+CurPos, SEEK_SET);

    if(buffer_size > (int) DataSize-CurPos)
        buffer_size = DataSize-CurPos;

    int read = file_fd->read(buffer, buffer_size);
    if(read > 0)
    {
        CurPos += read;
    }

    return read;
}