usbloadergx/source/SoundOperations/BNSDecoder.cpp

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/***************************************************************************
* 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 <malloc.h>
#include <string.h>
#include <math.h>
#include <unistd.h>
#include "BNSDecoder.hpp"
SoundBlock DecodefromBNS(const u8 *buffer, u32 size);
BNSDecoder::BNSDecoder(const char * filepath)
: SoundDecoder(filepath)
{
SoundType = SOUND_BNS;
memset(&SoundData, 0, sizeof(SoundBlock));
if(!file_fd)
return;
OpenFile();
}
BNSDecoder::BNSDecoder(const u8 * snd, int len)
: SoundDecoder(snd, len)
{
SoundType = SOUND_BNS;
memset(&SoundData, 0, sizeof(SoundBlock));
if(!file_fd)
return;
OpenFile();
}
BNSDecoder::~BNSDecoder()
{
ExitRequested = true;
while(Decoding)
usleep(100);
if(SoundData.buffer != NULL)
free(SoundData.buffer);
SoundData.buffer = NULL;
}
void BNSDecoder::OpenFile()
{
u8 * tempbuff = new (std::nothrow) u8[file_fd->size()];
if(!tempbuff)
{
CloseFile();
return;
}
int done = 0;
while(done < file_fd->size())
{
int read = file_fd->read(tempbuff, file_fd->size());
if(read > 0)
done += read;
else
{
CloseFile();
return;
}
}
SoundData = DecodefromBNS(tempbuff, done);
if(SoundData.buffer == NULL)
{
CloseFile();
return;
}
delete [] tempbuff;
tempbuff = NULL;
Decode();
}
void BNSDecoder::CloseFile()
{
if(file_fd)
delete file_fd;
file_fd = NULL;
}
int BNSDecoder::Read(u8 * buffer, int buffer_size, int pos)
{
if(!SoundData.buffer)
return -1;
if(SoundData.loopFlag)
{
int factor = SoundData.format == VOICE_STEREO_16BIT ? 4 : 2;
if(CurPos >= (int) SoundData.loopEnd*factor)
CurPos = SoundData.loopStart*factor;
if(buffer_size > (int) SoundData.loopEnd*factor-CurPos)
buffer_size = SoundData.loopEnd*factor-CurPos;
}
else
{
if(CurPos >= (int) SoundData.size)
return 0;
if(buffer_size > (int) SoundData.size-CurPos)
buffer_size = SoundData.size-CurPos;
}
memcpy(buffer, SoundData.buffer+CurPos, buffer_size);
CurPos += buffer_size;
return buffer_size;
}
struct BNSHeader
{
u32 fccBNS;
u32 magic;
u32 size;
u16 unk1;
u16 unk2;
u32 infoOffset;
u32 infoSize;
u32 dataOffset;
u32 dataSize;
} __attribute__((packed));
struct BNSInfo
{
u32 fccINFO;
u32 size;
u8 codecNum;
u8 loopFlag;
u8 chanCount;
u8 zero;
u16 freq;
u8 pad1[2];
u32 loopStart;
u32 loopEnd;
u32 offsetToChanStarts;
u8 pad2[4];
u32 chan1StartOffset;
u32 chan2StartOffset;
u32 chan1Start;
u32 coeff1Offset;
u8 pad3[4];
u32 chan2Start;
u32 coeff2Offset;
u8 pad4[4];
s16 coefficients1[8][2];
u16 chan1Gain;
u16 chan1PredictiveScale;
s16 chan1PrevSamples[2];
u16 chan1LoopPredictiveScale;
s16 chan1LoopPrevSamples[2];
u16 chan1LoopPadding;
s16 coefficients2[8][2];
u16 chan2Gain;
u16 chan2PredictiveScale;
s16 chan2PrevSamples[2];
u16 chan2LoopPredictiveScale;
s16 chan2LoopPrevSamples[2];
u16 chan2LoopPadding;
} __attribute__((packed));
struct BNSData
{
u32 fccDATA;
u32 size;
u8 data;
} __attribute__((packed));
struct ADPCMByte
{
s8 sample1 : 4;
s8 sample2 : 4;
} __attribute__((packed));
struct BNSADPCMBlock
{
u8 pad : 1;
u8 coeffIndex : 3;
u8 lshift : 4;
ADPCMByte samples[7];
} __attribute__((packed));
struct BNSDecObj
{
s16 prevSamples[2];
s16 coeff[8][2];
};
static void loadBNSInfo(BNSInfo &bnsInfo, const u8 *buffer)
{
const u8 *ptr = buffer + 8;
bnsInfo = *(const BNSInfo *)buffer;
if (bnsInfo.offsetToChanStarts == 0x18 && bnsInfo.chan1StartOffset == 0x20 && bnsInfo.chan2StartOffset == 0x2C
&& bnsInfo.coeff1Offset == 0x38 && bnsInfo.coeff2Offset == 0x68)
return;
bnsInfo.chan1StartOffset = *(const u32 *)(ptr + bnsInfo.offsetToChanStarts);
bnsInfo.chan1Start = *(const u32 *)(ptr + bnsInfo.chan1StartOffset);
bnsInfo.coeff1Offset = *(const u32 *)(ptr + bnsInfo.chan1StartOffset + 4);
if ((u8 *)bnsInfo.coefficients1 != ptr + bnsInfo.coeff1Offset)
memcpy(bnsInfo.coefficients1, ptr + bnsInfo.coeff1Offset, (u8 *)bnsInfo.coefficients2 - (u8 *)&bnsInfo.coefficients1);
if (bnsInfo.chanCount == 2)
{
bnsInfo.chan2StartOffset = *(const u32 *)(ptr + bnsInfo.offsetToChanStarts + 4);
bnsInfo.chan2Start = *(const u32 *)(ptr + bnsInfo.chan2StartOffset);
bnsInfo.coeff2Offset = *(const u32 *)(ptr + bnsInfo.chan2StartOffset + 4);
if ((u8 *)bnsInfo.coefficients2 != ptr + bnsInfo.coeff2Offset)
memcpy(bnsInfo.coefficients2, ptr + bnsInfo.coeff2Offset, (u8 *)bnsInfo.coefficients2 - (u8 *)&bnsInfo.coefficients1);
}
}
static void decodeADPCMBlock(s16 *buffer, const BNSADPCMBlock &block, BNSDecObj &bnsDec)
{
int h1 = bnsDec.prevSamples[0];
int h2 = bnsDec.prevSamples[1];
int c1 = bnsDec.coeff[block.coeffIndex][0];
int c2 = bnsDec.coeff[block.coeffIndex][1];
for (int i = 0; i < 14; ++i)
{
int nibSample = ((i & 1) == 0) ? block.samples[i / 2].sample1 : block.samples[i / 2].sample2;
int sampleDeltaHP = (nibSample << block.lshift) << 11;
int predictedSampleHP = c1 * h1 + c2 * h2;
int sampleHP = predictedSampleHP + sampleDeltaHP;
buffer[i] = std::min(std::max(-32768, (sampleHP + 1024) >> 11), 32767);
h2 = h1;
h1 = buffer[i];
}
bnsDec.prevSamples[0] = h1;
bnsDec.prevSamples[1] = h2;
}
static u8 * decodeBNS(u32 &size, const BNSInfo &bnsInfo, const BNSData &bnsData)
{
static s16 smplBlock[14];
BNSDecObj decObj;
int numBlocks = (bnsData.size - 8) / 8;
int numSamples = numBlocks * 14;
const BNSADPCMBlock *inputBuf = (const BNSADPCMBlock *)&bnsData.data;
u8 * buffer = (u8 *) malloc(numSamples * sizeof (s16));
s16 *outputBuf;
if (!buffer)
return buffer;
memcpy(decObj.coeff, bnsInfo.coefficients1, sizeof decObj.coeff);
memcpy(decObj.prevSamples, bnsInfo.chan1PrevSamples, sizeof decObj.prevSamples);
outputBuf = (s16 *)buffer;
if (bnsInfo.chanCount == 1)
for (int i = 0; i < numBlocks; ++i)
{
decodeADPCMBlock(smplBlock, inputBuf[i], decObj);
memcpy(outputBuf, smplBlock, sizeof smplBlock);
outputBuf += 14;
}
else
{
numBlocks /= 2;
for (int i = 0; i < numBlocks; ++i)
{
decodeADPCMBlock(smplBlock, inputBuf[i], decObj);
for (int j = 0; j < 14; ++j)
outputBuf[j * 2] = smplBlock[j];
outputBuf += 2 * 14;
}
outputBuf = (s16 *)buffer + 1;
memcpy(decObj.coeff, bnsInfo.coefficients2, sizeof decObj.coeff);
memcpy(decObj.prevSamples, bnsInfo.chan2PrevSamples, sizeof decObj.prevSamples);
for (int i = 0; i < numBlocks; ++i)
{
decodeADPCMBlock(smplBlock, inputBuf[numBlocks + i], decObj);
for (int j = 0; j < 14; ++j)
outputBuf[j * 2] = smplBlock[j];
outputBuf += 2 * 14;
}
}
size = numSamples * sizeof (s16);
return buffer;
}
SoundBlock DecodefromBNS(const u8 *buffer, u32 size)
{
SoundBlock OutBlock;
memset(&OutBlock, 0, sizeof(SoundBlock));
const BNSHeader &hdr = *(BNSHeader *)buffer;
if (size < sizeof hdr)
return OutBlock;
if (hdr.fccBNS != 'BNS ')
return OutBlock;
// Find info and data
BNSInfo infoChunk;
loadBNSInfo(infoChunk, buffer + hdr.infoOffset);
const BNSData &dataChunk = *(const BNSData *)(buffer + hdr.dataOffset);
// Check sizes
if (size < hdr.size || size < hdr.infoOffset + hdr.infoSize || size < hdr.dataOffset + hdr.dataSize
|| hdr.infoSize < 0x60 || hdr.dataSize < sizeof dataChunk
|| infoChunk.size != hdr.infoSize || dataChunk.size != hdr.dataSize)
return OutBlock;
// Check format
if (infoChunk.codecNum != 0) // Only codec i've found : 0 = ADPCM. Maybe there's also 1 and 2 for PCM 8 or 16 bits ?
return OutBlock;
u8 format = (u8)-1;
if (infoChunk.chanCount == 1 && infoChunk.codecNum == 0)
format = VOICE_MONO_16BIT;
else if (infoChunk.chanCount == 2 && infoChunk.codecNum == 0)
format = VOICE_STEREO_16BIT;
if (format == (u8)-1)
return OutBlock;
u32 freq = (u32) infoChunk.freq;
u32 length = 0;
// Copy data
if (infoChunk.codecNum == 0)
{
OutBlock.buffer = decodeBNS(length, infoChunk, dataChunk);
if (!OutBlock.buffer)
return OutBlock;
}
else
{
OutBlock.buffer = (u8*) malloc(dataChunk.size);
if (!OutBlock.buffer)
return OutBlock;
memcpy(OutBlock.buffer, &dataChunk.data, dataChunk.size);
length = dataChunk.size;
}
OutBlock.frequency = freq;
OutBlock.format = format;
OutBlock.size = length;
OutBlock.loopStart = infoChunk.loopStart;
OutBlock.loopEnd = infoChunk.loopEnd;
OutBlock.loopFlag = infoChunk.loopFlag;
return OutBlock;
}