usbloadergx/source/SoundOperations/AifDecoder.cpp
dimok321 973d8b2005 *Fixed compile error
*Converted every 4 spaces to a tab to make the source consistent on those
2011-07-25 22:28:22 +00:00

215 lines
4.4 KiB
C++

/***************************************************************************
* 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;
}