AIFFFileIO.cxx

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/*
 * Copyright (c) 2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "extended.hxx"
#include "AIFFFileIO.hxx"
#include "ErrSoundFileIO.hxx"


using namespace CLAM;

void AIFFFileIO::InitSelf(void)
{
#ifdef SOUNDFILEIO_LITTLE_ENDIAN
        mSwap = true;
#endif
}

#ifdef SOUNDFILEIO_LITTLE_ENDIAN
#define SWAP(var) Swap(var)
#else
#define SWAP(var)
#endif

int AIFFFileIO::ReadChunkHeader(ChunkHeader& h)
{
        int ret = int( fread(&h,1,sizeof(h),mFile) );
        SWAP(h.len);
        return ret;
}

int AIFFFileIO::WriteChunkHeader(const ChunkHeader& h)
{
        ChunkHeader cp = h;
        SWAP(cp.len);
        return int(fwrite(&cp,1,sizeof(cp),mFile) );
}

int AIFFFileIO::ReadID(ID& id)
{
        return int( fread(&id,1,sizeof(id),mFile) );
}

int AIFFFileIO::WriteID(ID& id)
{
        return int( fwrite(&id,1,sizeof(id),mFile) );
}

bool AIFFFileIO::CheckID(const ID& id,const ID& cmp)
{
        return !memcmp(&id,&cmp,4);
}

void AIFFFileIO::ReadHeader(void)
{
        unsigned int i = 0;
        bool fmtFound = false;
        fseek(mFile,0,SEEK_SET);
        ID AIFFID;
        ChunkHeader form;
        ReadChunkHeader(form);
        if (!CheckID(form.id,"FORM"))
        {
                UnsupportedSoundFileFormat error( "Given file had not a valid AIFF header ");
                throw error;
        }
        i = 0;
        i += ReadID(AIFFID);
        if (!CheckID(AIFFID,"AIFF"))
        {
                UnsupportedSoundFileFormat error( "Given file had not a valid AIFF header " );
                throw error;
        }

        while (i<form.len) {
                ChunkHeader h;
                i += ReadChunkHeader(h);
                if (CheckID(h.id,"COMM")) {
                        AIFFCommChunk fmt;
                        i += int( fread(&fmt,1,sizeof(fmt),mFile) );

                        if (sizeof(fmt)!=2+4+2+10) 
                        {
                                UnsupportedSoundFileFormat error( "Incorrect size of AIFFCommChunk: check alignment" );
                                
                                throw error;
                        }

                        SWAP(fmt.channels);
                        SWAP(fmt.numSampleFrames);
                        SWAP(fmt.sampleWidth);

                        mHeader.mSampleWidth = fmt.sampleWidth;
                        mHeader.mBytesPerSample = (mHeader.mSampleWidth+7)>>3;
                        mHeader.mChannels = fmt.channels;
                        mHeader.mSamplerate = tenbytefloat2int(fmt.samplerate.bytes);
                        mSize = fmt.numSampleFrames;
                        fmtFound = true;
                }
                else{
                        if (CheckID(h.id,"SSND")) {
                                unsigned int offset;
                                unsigned int blockSize;

                                fread(&offset,1,sizeof(offset),mFile);
                                fread(&blockSize,1,sizeof(blockSize),mFile);

                                mOffset = sizeof(form)+i;
                        }
                        i += h.len;
                        fseek(mFile, sizeof(form)+i, SEEK_SET);
                }
        }
        if (!fmtFound)
        {
                UnsupportedSoundFileFormat error( "Given file had not a valid header!" );
                throw error;
        }
        if (mOffset == 0) 
        {
                UnsupportedSoundFileFormat error( "Given file contained no audio data");
                throw error;
        }
}

void AIFFFileIO::WriteHeader(void)
{
        fseek(mFile,0,SEEK_SET);
        mOffset = 0;
        ChunkHeader formHeader("FORM");
        ChunkHeader fmtHeader("COMM",sizeof(AIFFCommChunk));
        ChunkHeader dataHeader("SSND",mSize*2);

        AIFFCommChunk fmtChunk;
        ID AIFFID("AIFF");

        if (mStdIO && mSize==0)
        {       
                dataHeader.len = 0x7FFFFFFF;
        }

        formHeader.len = 
                sizeof(AIFFID) + 
                sizeof(fmtHeader) + fmtHeader.len + 
                sizeof(dataHeader) + dataHeader.len;

        fmtChunk.channels = mHeader.mChannels;
        uint2tenbytefloat(mHeader.mSamplerate,fmtChunk.samplerate.bytes);
        fmtChunk.numSampleFrames = mSize;
        fmtChunk.sampleWidth = 16;
        
        mOffset += WriteChunkHeader(formHeader);
        mOffset += WriteID(AIFFID);
        mOffset += WriteChunkHeader(fmtHeader);

        SWAP(fmtChunk.channels);
        SWAP(fmtChunk.numSampleFrames);
        SWAP(fmtChunk.sampleWidth);
        
        mOffset += int( fwrite(&fmtChunk,1,sizeof(fmtChunk),mFile) );
        mOffset += WriteChunkHeader(dataHeader);

        unsigned int offset = 0;
        unsigned int blockSize = 0;

        SWAP(offset);
        SWAP(blockSize);

        mOffset += int( fwrite(&offset,1,sizeof(offset),mFile) );
        mOffset += int( fwrite(&blockSize,1,sizeof(blockSize),mFile) );
}

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