mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-12-30 22:01:55 +01:00
366 lines
9.0 KiB
C++
366 lines
9.0 KiB
C++
/***************************************************************************
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* Copyright (C) 2010
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* by Dimok
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any
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* damages arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any
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* purpose, including commercial applications, and to alter it and
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* redistribute it freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you
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* must not claim that you wrote the original software. If you use
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* this software in a product, an acknowledgment in the product
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* documentation would be appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and
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* must not be misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*
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* for WiiXplorer 2010
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***************************************************************************/
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#include <malloc.h>
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#include <string.h>
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#include <math.h>
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#include <unistd.h>
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#include "BNSDecoder.hpp"
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SoundBlock DecodefromBNS(const u8 *buffer, u32 size);
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BNSDecoder::BNSDecoder(const char * filepath)
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: SoundDecoder(filepath)
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{
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SoundType = SOUND_BNS;
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memset(&SoundData, 0, sizeof(SoundBlock));
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if(!file_fd)
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return;
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OpenFile();
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}
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BNSDecoder::BNSDecoder(const u8 * snd, int len)
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: SoundDecoder(snd, len)
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{
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SoundType = SOUND_BNS;
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memset(&SoundData, 0, sizeof(SoundBlock));
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if(!file_fd)
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return;
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OpenFile();
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}
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BNSDecoder::~BNSDecoder()
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{
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ExitRequested = true;
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while(Decoding)
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usleep(100);
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if(SoundData.buffer != NULL)
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free(SoundData.buffer);
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SoundData.buffer = NULL;
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}
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void BNSDecoder::OpenFile()
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{
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u8 * tempbuff = new (std::nothrow) u8[file_fd->size()];
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if(!tempbuff)
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{
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CloseFile();
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return;
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}
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int done = 0;
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while(done < file_fd->size())
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{
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int read = file_fd->read(tempbuff+done, file_fd->size()-done);
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if(read > 0)
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done += read;
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else
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{
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CloseFile();
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return;
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}
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}
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SoundData = DecodefromBNS(tempbuff, done);
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if(SoundData.buffer == NULL)
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{
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CloseFile();
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return;
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}
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delete [] tempbuff;
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tempbuff = NULL;
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Decode();
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}
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void BNSDecoder::CloseFile()
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{
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if(file_fd)
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delete file_fd;
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file_fd = NULL;
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}
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int BNSDecoder::Read(u8 * buffer, int buffer_size, int)
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{
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if(!SoundData.buffer)
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return -1;
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if(SoundData.loopFlag)
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{
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int factor = SoundData.format == VOICE_STEREO_16BIT ? 4 : 2;
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if(CurPos >= (int) SoundData.loopEnd*factor)
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CurPos = SoundData.loopStart*factor;
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if(buffer_size > (int) SoundData.loopEnd*factor-CurPos)
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buffer_size = SoundData.loopEnd*factor-CurPos;
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}
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else
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{
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if(CurPos >= (int) SoundData.size)
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return 0;
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if(buffer_size > (int) SoundData.size-CurPos)
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buffer_size = SoundData.size-CurPos;
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}
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memcpy(buffer, SoundData.buffer+CurPos, buffer_size);
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CurPos += buffer_size;
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return buffer_size;
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}
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struct BNSHeader
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{
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u32 fccBNS;
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u32 magic;
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u32 size;
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u16 unk1;
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u16 unk2;
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u32 infoOffset;
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u32 infoSize;
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u32 dataOffset;
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u32 dataSize;
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} __attribute__((packed));
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struct BNSInfo
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{
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u32 fccINFO;
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u32 size;
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u8 codecNum;
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u8 loopFlag;
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u8 chanCount;
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u8 zero;
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u16 freq;
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u8 pad1[2];
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u32 loopStart;
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u32 loopEnd;
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u32 offsetToChanStarts;
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u8 pad2[4];
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u32 chan1StartOffset;
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u32 chan2StartOffset;
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u32 chan1Start;
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u32 coeff1Offset;
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u8 pad3[4];
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u32 chan2Start;
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u32 coeff2Offset;
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u8 pad4[4];
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s16 coefficients1[8][2];
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u16 chan1Gain;
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u16 chan1PredictiveScale;
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s16 chan1PrevSamples[2];
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u16 chan1LoopPredictiveScale;
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s16 chan1LoopPrevSamples[2];
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u16 chan1LoopPadding;
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s16 coefficients2[8][2];
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u16 chan2Gain;
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u16 chan2PredictiveScale;
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s16 chan2PrevSamples[2];
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u16 chan2LoopPredictiveScale;
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s16 chan2LoopPrevSamples[2];
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u16 chan2LoopPadding;
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} __attribute__((packed));
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struct BNSData
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{
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u32 fccDATA;
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u32 size;
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u8 data;
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} __attribute__((packed));
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struct ADPCMByte
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{
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s8 sample1 : 4;
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s8 sample2 : 4;
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} __attribute__((packed));
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struct BNSADPCMBlock
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{
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u8 pad : 1;
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u8 coeffIndex : 3;
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u8 lshift : 4;
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ADPCMByte samples[7];
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} __attribute__((packed));
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struct BNSDecObj
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{
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s16 prevSamples[2];
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s16 coeff[8][2];
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};
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static void loadBNSInfo(BNSInfo &bnsInfo, const u8 *buffer)
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{
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const u8 *ptr = buffer + 8;
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bnsInfo = *(const BNSInfo *)buffer;
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if (bnsInfo.offsetToChanStarts == 0x18 && bnsInfo.chan1StartOffset == 0x20 && bnsInfo.chan2StartOffset == 0x2C
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&& bnsInfo.coeff1Offset == 0x38 && bnsInfo.coeff2Offset == 0x68)
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return;
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bnsInfo.chan1StartOffset = *(const u32 *)(ptr + bnsInfo.offsetToChanStarts);
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bnsInfo.chan1Start = *(const u32 *)(ptr + bnsInfo.chan1StartOffset);
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bnsInfo.coeff1Offset = *(const u32 *)(ptr + bnsInfo.chan1StartOffset + 4);
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if ((u8 *)bnsInfo.coefficients1 != ptr + bnsInfo.coeff1Offset)
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memcpy(bnsInfo.coefficients1, ptr + bnsInfo.coeff1Offset, (u8 *)bnsInfo.coefficients2 - (u8 *)&bnsInfo.coefficients1);
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if (bnsInfo.chanCount == 2)
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{
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bnsInfo.chan2StartOffset = *(const u32 *)(ptr + bnsInfo.offsetToChanStarts + 4);
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bnsInfo.chan2Start = *(const u32 *)(ptr + bnsInfo.chan2StartOffset);
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bnsInfo.coeff2Offset = *(const u32 *)(ptr + bnsInfo.chan2StartOffset + 4);
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if ((u8 *)bnsInfo.coefficients2 != ptr + bnsInfo.coeff2Offset)
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memcpy(bnsInfo.coefficients2, ptr + bnsInfo.coeff2Offset, (u8 *)bnsInfo.coefficients2 - (u8 *)&bnsInfo.coefficients1);
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}
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}
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static void decodeADPCMBlock(s16 *buffer, const BNSADPCMBlock &block, BNSDecObj &bnsDec)
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{
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int h1 = bnsDec.prevSamples[0];
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int h2 = bnsDec.prevSamples[1];
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int c1 = bnsDec.coeff[block.coeffIndex][0];
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int c2 = bnsDec.coeff[block.coeffIndex][1];
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for (int i = 0; i < 14; ++i)
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{
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int nibSample = ((i & 1) == 0) ? block.samples[i / 2].sample1 : block.samples[i / 2].sample2;
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int sampleDeltaHP = (nibSample << block.lshift) << 11;
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int predictedSampleHP = c1 * h1 + c2 * h2;
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int sampleHP = predictedSampleHP + sampleDeltaHP;
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buffer[i] = std::min(std::max(-32768, (sampleHP + 1024) >> 11), 32767);
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h2 = h1;
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h1 = buffer[i];
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}
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bnsDec.prevSamples[0] = h1;
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bnsDec.prevSamples[1] = h2;
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}
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static u8 * decodeBNS(u32 &size, const BNSInfo &bnsInfo, const BNSData &bnsData)
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{
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static s16 smplBlock[14];
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BNSDecObj decObj;
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int numBlocks = (bnsData.size - 8) / 8;
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int numSamples = numBlocks * 14;
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const BNSADPCMBlock *inputBuf = (const BNSADPCMBlock *)&bnsData.data;
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u8 * buffer = (u8 *) malloc(numSamples * sizeof (s16));
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s16 *outputBuf;
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if (!buffer)
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return buffer;
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memcpy(decObj.coeff, bnsInfo.coefficients1, sizeof decObj.coeff);
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memcpy(decObj.prevSamples, bnsInfo.chan1PrevSamples, sizeof decObj.prevSamples);
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outputBuf = (s16 *)buffer;
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if (bnsInfo.chanCount == 1)
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for (int i = 0; i < numBlocks; ++i)
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{
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decodeADPCMBlock(smplBlock, inputBuf[i], decObj);
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memcpy(outputBuf, smplBlock, sizeof smplBlock);
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outputBuf += 14;
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}
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else
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{
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numBlocks /= 2;
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for (int i = 0; i < numBlocks; ++i)
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{
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decodeADPCMBlock(smplBlock, inputBuf[i], decObj);
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for (int j = 0; j < 14; ++j)
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outputBuf[j * 2] = smplBlock[j];
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outputBuf += 2 * 14;
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}
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outputBuf = (s16 *)buffer + 1;
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memcpy(decObj.coeff, bnsInfo.coefficients2, sizeof decObj.coeff);
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memcpy(decObj.prevSamples, bnsInfo.chan2PrevSamples, sizeof decObj.prevSamples);
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for (int i = 0; i < numBlocks; ++i)
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{
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decodeADPCMBlock(smplBlock, inputBuf[numBlocks + i], decObj);
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for (int j = 0; j < 14; ++j)
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outputBuf[j * 2] = smplBlock[j];
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outputBuf += 2 * 14;
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}
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}
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size = numSamples * sizeof (s16);
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return buffer;
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}
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SoundBlock DecodefromBNS(const u8 *buffer, u32 size)
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{
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SoundBlock OutBlock;
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memset(&OutBlock, 0, sizeof(SoundBlock));
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const BNSHeader &hdr = *(BNSHeader *)buffer;
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if(size < sizeof hdr)
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return OutBlock;
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if(memcmp(&hdr.fccBNS, "BNS ", 4) != 0)
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return OutBlock;
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// Find info and data
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BNSInfo infoChunk;
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loadBNSInfo(infoChunk, buffer + hdr.infoOffset);
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const BNSData &dataChunk = *(const BNSData *)(buffer + hdr.dataOffset);
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// Check sizes
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if (size < hdr.size || size < hdr.infoOffset + hdr.infoSize || size < hdr.dataOffset + hdr.dataSize
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|| hdr.infoSize < 0x60 || hdr.dataSize < sizeof dataChunk
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|| infoChunk.size != hdr.infoSize || dataChunk.size > hdr.dataSize)
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return OutBlock;
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// Check format
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if (infoChunk.codecNum != 0) // Only codec i've found : 0 = ADPCM. Maybe there's also 1 and 2 for PCM 8 or 16 bits ?
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return OutBlock;
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u8 format = (u8)-1;
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if (infoChunk.chanCount == 1 && infoChunk.codecNum == 0)
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format = VOICE_MONO_16BIT;
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else if (infoChunk.chanCount == 2 && infoChunk.codecNum == 0)
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format = VOICE_STEREO_16BIT;
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if (format == (u8)-1)
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return OutBlock;
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u32 freq = (u32) infoChunk.freq;
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u32 length = 0;
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// Copy data
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if (infoChunk.codecNum == 0)
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{
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OutBlock.buffer = decodeBNS(length, infoChunk, dataChunk);
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if (!OutBlock.buffer)
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return OutBlock;
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}
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else
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{
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OutBlock.buffer = (u8*) malloc(dataChunk.size);
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if (!OutBlock.buffer)
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return OutBlock;
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memcpy(OutBlock.buffer, &dataChunk.data, dataChunk.size);
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length = dataChunk.size;
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}
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OutBlock.frequency = freq;
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OutBlock.format = format;
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OutBlock.size = length;
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OutBlock.loopStart = infoChunk.loopStart;
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OutBlock.loopEnd = infoChunk.loopEnd;
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OutBlock.loopFlag = infoChunk.loopFlag;
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return OutBlock;
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}
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