CWE-ou-minkata/Sources/Plasma/PubUtilLib/plAudioCore/plBufferedFileReader.cpp

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*==LICENSE==*/
//////////////////////////////////////////////////////////////////////////////
//                                                                          //
//  plBufferedFileReader - Reads in a given file into a RAM buffer, then    //
//                         "reads" from that buffer as requested. Useless   //
//                         for normal sounds, but perfect for streaming     //
//                         from RAM.                                        //
//                                                                          //
//// Notes ///////////////////////////////////////////////////////////////////
//                                                                          //
//  11.1.2002 - Created by mcn.                                             //
//                                                                          //
//////////////////////////////////////////////////////////////////////////////

#include "HeadSpin.h"
#include "plBufferedFileReader.h"
#include "plFileSystem.h"
//#include "plProfile.h"


//plProfile_CreateMemCounter( "BufferedRAM", "Sound", SndBufferedMem );

//// Constructor/Destructor //////////////////////////////////////////////////

plBufferedFileReader::plBufferedFileReader( const plFileName &path, plAudioCore::ChannelSelect whichChan )
{
    // Init some stuff
    fBufferSize = 0;
    fBuffer = nil;
    fCursor = 0;

    hsAssert( path.IsValid(), "Invalid path specified in plBufferedFileReader" );

    // Ask plAudioFileReader for another reader to get this file
    // Note: have this reader do the chanSelect for us
    plAudioFileReader *reader = plAudioFileReader::CreateReader( path, whichChan );
    if( reader == nil || !reader->IsValid() )
    {
        delete reader;
        IError( "Unable to open file to read in to RAM buffer" );
        return;
    }

    fHeader = reader->GetHeader();

    fBufferSize = reader->GetDataSize();
    fBuffer = new uint8_t[ fBufferSize ];
    //plProfile_NewMem( SndBufferedMem, fBufferSize );
    if( fBuffer == nil )
    {
        delete reader;
        IError( "Unable to allocate RAM buffer" );
        return;
    }

    if( !reader->Read( fBufferSize, fBuffer ) )
    {
        delete reader;
        IError( "Unable to read file into RAM buffer" );
        return;
    }

    // All done!
    delete reader;
}

plBufferedFileReader::~plBufferedFileReader()
{
    Close();
}

void    plBufferedFileReader::Close( void )
{
    //plProfile_DelMem( SndBufferedMem, fBufferSize );

    delete fBuffer;
    fBuffer = nil;
    fBufferSize = 0;
    fCursor = 0;
}

void    plBufferedFileReader::IError( const char *msg )
{
    hsAssert( false, msg );
    Close();
}

plWAVHeader &plBufferedFileReader::GetHeader( void )
{
    hsAssert( IsValid(), "GetHeader() called on an invalid RAM buffer" );

    return fHeader;
}

float   plBufferedFileReader::GetLengthInSecs( void )
{
    hsAssert( IsValid(), "GetLengthInSecs() called on an invalid RAM buffer" );

    return (float)fBufferSize / (float)fHeader.fAvgBytesPerSec;
}

bool    plBufferedFileReader::SetPosition( uint32_t numBytes )
{
    hsAssert( IsValid(), "SetPosition() called on an invalid RAM buffer" );

    if( numBytes > fBufferSize )
    {
        hsAssert( false, "Invalid position in SetPosition()" );
        return false;
    }

    fCursor = numBytes;
    return true;
}

bool    plBufferedFileReader::Read( uint32_t numBytes, void *buffer )
{
    hsAssert( IsValid(), "Read() called on an invalid RAM buffer" );


    bool valid = true;

    if( fCursor + numBytes > fBufferSize )
    {
        numBytes = fBufferSize - fCursor;
        valid = false;
    }

    memcpy( buffer, fBuffer + fCursor, numBytes );
    fCursor += numBytes;

    return valid;
}

uint32_t  plBufferedFileReader::NumBytesLeft( void )
{
    hsAssert( IsValid(), "NumBytesLeft() called on an invalid RAM buffer" );

    return fBufferSize - fCursor;
}