/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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 3 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, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
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(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
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You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
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*==LICENSE==*/
//////////////////////////////////////////////////////////////////////////////
//                                                                          //
//  plOGGCodec - Plasma codec support for the OGG/Vorbis file format.       //
//                                                                          //
//// Notes ///////////////////////////////////////////////////////////////////
//                                                                          //
//  2.7.2003 - Created by mcn. If only life were really this simple...      //
//                                                                          //
//////////////////////////////////////////////////////////////////////////////


#include <math.h>
#include <vorbis/codec.h>
#include <vorbis/vorbisfile.h>

#include "HeadSpin.h"
#include "plOGGCodec.h"

#include "hsTimer.h"
#include "pnNetCommon/plNetApp.h"

plOGGCodec::DecodeFormat    plOGGCodec::fDecodeFormat = plOGGCodec::k16bitSigned;
uint8_t                       plOGGCodec::fDecodeFlags = 0;

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

plOGGCodec::plOGGCodec( const char *path, plAudioCore::ChannelSelect whichChan ) : fFileHandle( nil )
{
    fOggFile = nil;
    IOpen( path, whichChan );
    fCurHeaderPos = 0;
    fHeadBuf = nil;
}

void    plOGGCodec::BuildActualWaveHeader()
{
    // Build an actual WAVE header for this ogg
    int fmtSize = 16;
    short fmt = 1;
    int factsize = 4;
    int factdata = 0;
    int size = fDataSize+48; // size of data with header except for first four bytes

    fHeadBuf = (uint8_t *)malloc(56);
    memcpy(fHeadBuf, "RIFF", 4);
    memcpy(fHeadBuf+4, &size, 4);
    memcpy(fHeadBuf+8, "WAVE", 4);
    memcpy(fHeadBuf+12, "fmt ", 4);
    memcpy(fHeadBuf+16, &fmtSize, 4);
    memcpy(fHeadBuf+20, &fmt, 2); /* format */
    memcpy(fHeadBuf+22, &fHeader.fNumChannels, 2);
    memcpy(fHeadBuf+24, &fHeader.fNumSamplesPerSec, 4);
    memcpy(fHeadBuf+28, &fHeader.fAvgBytesPerSec, 4);
    memcpy(fHeadBuf+32, &fHeader.fBlockAlign, 4);
    memcpy(fHeadBuf+34, &fHeader.fBitsPerSample, 2);
    memcpy(fHeadBuf+36, "fact", 4);
    memcpy(fHeadBuf+40, &factsize, 4);
    memcpy(fHeadBuf+44, &factdata, 4);
    memcpy(fHeadBuf+48, "data", 4);
    memcpy(fHeadBuf+52, &fDataSize, 4);
}

bool plOGGCodec::ReadFromHeader(int numBytes, void *data)
{
    if(fCurHeaderPos < 56)
    {
        memcpy(data, fHeadBuf+fCurHeaderPos, numBytes);
        fCurHeaderPos += numBytes;
        return true;
    }
    return false;
}

void    plOGGCodec::IOpen( const char *path, plAudioCore::ChannelSelect whichChan )
{
    hsAssert( path != nil, "Invalid path specified in plOGGCodec reader" );

    // plNetClientApp::StaticDebugMsg("Ogg Open %s, t=%f, start", path, hsTimer::GetSeconds());

    strncpy( fFilename, path, sizeof( fFilename ) );
    fWhichChannel = whichChan;

    /// Open the file as a plain binary stream
    fFileHandle = fopen( path, "rb" );
    if( fFileHandle != nil )
    {
        /// Create the OGG data struct
        fOggFile = new OggVorbis_File;

        /// Open the OGG decompressor
        if( ov_open( fFileHandle, fOggFile, NULL, 0 ) < 0 )
        {
            IError( "Unable to open OGG source file" );
            return;
        }

        /// Construct some header info from the ogg info
        vorbis_info *vInfo = ov_info( fOggFile, -1 );

        fHeader.fFormatTag = 1;
        fHeader.fNumChannels = vInfo->channels;
        fHeader.fNumSamplesPerSec = vInfo->rate;
    
        // Funny thing about the bits per sample: we get to CHOOSE. Go figure! 
        fHeader.fBitsPerSample = ( fDecodeFormat == k8bitUnsigned ) ? 8 : 16;

        // Why WAV files hold this info when it can be calculated is beyond me...
        fHeader.fBlockAlign = ( fHeader.fBitsPerSample * fHeader.fNumChannels ) >> 3;
        fHeader.fAvgBytesPerSec = fHeader.fNumSamplesPerSec * fHeader.fBlockAlign;

        
        /// The size in bytes of our PCM data stream
        /// Note: OGG sometimes seems to be off by 1 sample, which causes our reads to suck
        /// because we end up waiting for 1 more sample than we actually have. So, on the
        /// assumption that OGG is just slightly wrong sometimes, we just subtract 1 sample
        /// from what it tells us. As Brice put it, who's going to miss 1/40,000'ths of a second?
        fDataSize = (uint32_t)(( ov_pcm_total( fOggFile, -1 ) - 1 ) * fHeader.fBlockAlign);

        /// Channel select
        if( fWhichChannel != plAudioCore::kAll )
        {
            fChannelAdjust = 2;
            fChannelOffset = ( fWhichChannel == plAudioCore::kLeft ) ? 0 : 1;
        }
        else
        {
            fChannelAdjust = 1;
            fChannelOffset = 0;
        }
        

        /// Construct our fake header for channel adjustment
        fFakeHeader = fHeader;
        fFakeHeader.fAvgBytesPerSec /= fChannelAdjust;
        fFakeHeader.fNumChannels /= (uint16_t)fChannelAdjust;
        fFakeHeader.fBlockAlign /= (uint16_t)fChannelAdjust;

        SetPosition( 0 );
    }
//  plNetClientApp::StaticDebugMsg("Ogg Open %s, t=%f, end", path, hsTimer::GetSeconds());
}

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

void    plOGGCodec::Close( void )
{
    // plNetClientApp::StaticDebugMsg("Ogg Close, t=%f, start", hsTimer::GetSeconds());
    free(fHeadBuf);
    fHeadBuf = nil;
    if( fOggFile != nil )
    {
        ov_clear( fOggFile );
        delete fOggFile;
        fOggFile = nil;
    }

    if( fFileHandle != nil )
    {
        fclose( fFileHandle );
        fFileHandle = nil;
    }
    // plNetClientApp::StaticDebugMsg("Ogg Close, t=%f, end", hsTimer::GetSeconds());
}

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

plWAVHeader &plOGGCodec::GetHeader( void )
{
    hsAssert( IsValid(), "GetHeader() called on an invalid OGG file" );

    return fFakeHeader;
}

float   plOGGCodec::GetLengthInSecs( void )
{
    hsAssert( IsValid(), "GetLengthInSecs() called on an invalid OGG file" );

    // Just query ogg directly...starting to see how cool ogg is yet?
    return (float)ov_time_total( fOggFile, -1 );
}

hsBool  plOGGCodec::SetPosition( uint32_t numBytes )
{
    hsAssert( IsValid(), "GetHeader() called on an invalid OGG file" );
    

    if( !ov_seekable( fOggFile ) )
    {
        hsAssert( false, "Trying to set position on an unseekable OGG stream!" );
        return false;
    }

    // The numBytes position is in uncompressed space and should be sample-aligned anyway,
    // so this should be just fine here.
    ogg_int64_t newSample = ( numBytes / (fFakeHeader.fBlockAlign * fChannelAdjust) );

    // Now please note how freaking easy it is here to do accurate or fast seeking...
    // Also note that if we're doing our channel extraction, we MUST do it the accurate way
    if( ( fDecodeFlags & kFastSeeking ) && fChannelAdjust == 1 )
    {
        if( ov_pcm_seek_page( fOggFile, newSample ) != 0 )
        {
            IError( "Unable to seek OGG stream" );
            return false;
        }
    }
    else
    {
        if( ov_pcm_seek( fOggFile, newSample ) != 0 )
        {
            IError( "Unable to seek OGG stream" );
            return false;
        }
    }
    return true;
}

hsBool  plOGGCodec::Read( uint32_t numBytes, void *buffer )
{
    hsAssert( IsValid(), "GetHeader() called on an invalid OGG file" );
//  plNetClientApp::StaticDebugMsg("Ogg Read, t=%f, start", hsTimer::GetSeconds());

    int bytesPerSample = ( fDecodeFormat == k16bitSigned ) ? 2 : 1;
    int isSigned = ( fDecodeFormat == k16bitSigned ) ? 1 : 0;
    int currSection;
    
    if( fWhichChannel == plAudioCore::kAll )
    {
        // Easy, just a straight read
        char    *uBuffer = (char *)buffer;

        while( numBytes > 0 )
        {
            // Supposedly we should pay attention to currSection in case of bitrate changes,
            // but hopefully we'll never have those....

            long bytesRead = ov_read( fOggFile, uBuffer, numBytes, 0, bytesPerSample, isSigned, &currSection );
            
            // Since our job is so simple, do some extra error checking
            if( bytesRead == OV_HOLE )
            {
                IError( "Unable to read from OGG file: missing data" );
                return false;
            }
            else if( bytesRead == OV_EBADLINK )
            {
                IError( "Unable to read from OGG file: corrupt link" );
                return false;
            }
            else if( bytesRead == 0 )
            {
                IError( "Unable to finish reading from OGG file: end of stream" );
                return false;
            }
            else if( bytesRead < 0 )
            {
                IError( "Unable to read from OGG file: unknown error" );
                return false;
            }

            numBytes -= bytesRead;
            uBuffer += bytesRead;
        }
    }
    else
    {
        /// Read in 4k chunks and extract
        static char     trashBuffer[ 4096 ];

        long    toRead, i, thisRead, sampleSize = fFakeHeader.fBlockAlign;

        for( ; numBytes > 0; )
        {
            /// Read 4k worth of samples
            toRead = ( sizeof( trashBuffer ) < numBytes * fChannelAdjust ) ? sizeof( trashBuffer ) : numBytes * fChannelAdjust;


            thisRead = ov_read( fOggFile, (char *)trashBuffer, toRead, 0, bytesPerSample, isSigned, &currSection );
            if( thisRead < 0 )
                return false;

            /// Copy every other sample out
            int sampleOffset = (fChannelOffset == 1) ? sampleSize : 0;
            for (i = 0; i < thisRead; i += sampleSize * 2)
            {
                memcpy(buffer, &trashBuffer[i + sampleOffset], sampleSize);
                buffer = (void*)((uint8_t*)buffer + sampleSize);

                numBytes -= sampleSize;
            }
        }
    }

//  plNetClientApp::StaticDebugMsg("Ogg Read, t=%f, end", hsTimer::GetSeconds());
    return true;
}

uint32_t  plOGGCodec::NumBytesLeft( void )
{
    if(!IsValid())
    {
        hsAssert( false, "GetHeader() called on an invalid OGG file" );
        return 0;
    }

    return (uint32_t)(( fDataSize - ( ov_pcm_tell( fOggFile ) * fHeader.fBlockAlign ) ) / fChannelAdjust);
}
