/*------------------------------------------------------------------------------

   Copyright (c) 2000-2007 Tyrell Corporation. All rights reserved.

   Tyrell DarkIce

   File     : FaacEncoder.cpp
   Version  : $Revision$
   Author   : $Author$
   Location : $HeadURL$
   
   Copyright notice:

    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, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

------------------------------------------------------------------------------*/

/* ============================================================ include files */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

// compile the whole file only if faac support configured in
#ifdef HAVE_FAAC_LIB



#include "Exception.h"
#include "Util.h"
#include "FaacEncoder.h"


/* ===================================================  local data structures */


/* ================================================  local constants & macros */

/*------------------------------------------------------------------------------
 *  File identity
 *----------------------------------------------------------------------------*/
static const char fileid[] = "$Id$";


/* ===============================================  local function prototypes */


/* =============================================================  module code */

/*------------------------------------------------------------------------------
 *  Open an encoding session
 *----------------------------------------------------------------------------*/
bool
FaacEncoder :: open ( void )
                                                            throw ( Exception )
{
    if ( isOpen() ) {
        close();
    }

    // open the underlying sink
    if ( !getSink()->open() ) {
        throw Exception( __FILE__, __LINE__,
                         "faac lib opening underlying sink error");
    }

    char      * faacVersion;
    char      * faacCopyright;
    faacEncGetVersion(&faacVersion, &faacCopyright);
    reportEvent(1, "Using faac codec version", faacVersion);

    encoderHandle = faacEncOpen(getOutSampleRate(),
                                getInChannel(),
                                &inputSamples,
                                &maxOutputBytes);

    faacEncConfiguration      * faacConfig;

    faacConfig = faacEncGetCurrentConfiguration(encoderHandle);

    faacConfig->aacObjectType = MAIN;
    faacConfig->mpegVersion   = MPEG2;
    faacConfig->useTns        = 1;
    faacConfig->shortctl      = SHORTCTL_NORMAL;
    faacConfig->useLfe        = 0;
    faacConfig->allowMidside  = 1;
    faacConfig->bitRate       = getOutBitrate() * 1000 / getOutChannel();
    faacConfig->bandWidth     = lowpass;
    faacConfig->quantqual     = (unsigned long) (getOutQuality() * 1000.0);
    faacConfig->outputFormat  = 1;
    faacConfig->inputFormat   = FAAC_INPUT_16BIT;

    if (!faacEncSetConfiguration(encoderHandle, faacConfig)) {
        throw Exception(__FILE__, __LINE__,
                        "error configuring faac library");
    }

    // initialize the resampling coverter if needed
    if ( converter ) {

#ifdef HAVE_SRC_LIB
        converterData.input_frames   = 4096/((getInBitsPerSample() / 8) * getInChannel());
        converterData.data_in        = new float[converterData.input_frames*getInChannel()];
        converterData.output_frames  = (int) (converterData.input_frames * resampleRatio + 1);
        if ((int) inputSamples >  getInChannel() * converterData.output_frames) {
            resampledOffset       = new float[2 * inputSamples];
        } else {
            resampledOffset       = new float[2 * getInChannel() * converterData.input_frames];
        }
        converterData.src_ratio      = resampleRatio;
        converterData.end_of_input   = 0;
#else
        converter->initialize( resampleRatio, getInChannel());
        //needed 2x(converted input samples) to handle offsets
	int         outCount = 2 * getInChannel() * (inputSamples + 1);
        if (resampleRatio > 1)
	    outCount = (int) (outCount * resampleRatio);        
        resampledOffset = new short int[outCount];
#endif
        resampledOffsetSize = 0;
    }

    faacOpen = true;

    return true;
}


/*------------------------------------------------------------------------------
 *  Write data to the encoder
 *----------------------------------------------------------------------------*/
unsigned int
FaacEncoder :: write (  const void    * buf,
                        unsigned int    len )           throw ( Exception )
{
    if ( !isOpen() || len == 0 ) {
        return 0;
    }

    unsigned int    channels         = getInChannel();
    unsigned int    bitsPerSample    = getInBitsPerSample();
    unsigned int    sampleSize       = (bitsPerSample / 8) * channels;
    unsigned char * b                = (unsigned char*) buf;
    unsigned int    processed        = len - (len % sampleSize);
    unsigned int    nSamples         = processed / sampleSize;
    unsigned char * faacBuf          = new unsigned char[maxOutputBytes];
    int             samples          = (int) nSamples * channels;
    int             processedSamples = 0;



    if ( converter ) {
        unsigned int         converted;
#ifdef HAVE_SRC_LIB
        src_short_to_float_array ((short *) b, (float *) converterData.data_in, samples);
        converterData.input_frames   = nSamples;
        converterData.data_out = resampledOffset + (resampledOffsetSize * channels);
        int srcError = src_process (converter, &converterData);
        if (srcError)
             throw Exception (__FILE__, __LINE__, "libsamplerate error: ", src_strerror (srcError));
        converted = converterData.output_frames_gen;
#else
        int         inCount  = nSamples;
        short int     * shortBuffer  = new short int[samples];
        int         outCount = (int) (inCount * resampleRatio);
        Util::conv( bitsPerSample, b, processed, shortBuffer, isInBigEndian());
        converted = converter->resample( inCount,
                                         outCount+1,
                                         shortBuffer,
                                         &resampledOffset[resampledOffsetSize*channels]);
        delete[] shortBuffer;
#endif
        resampledOffsetSize += converted;

        // encode samples (if enough)
        while(resampledOffsetSize - processedSamples >= inputSamples/channels) {
            int outputBytes;
#ifdef HAVE_SRC_LIB
            short *shortData = new short[inputSamples];
            src_float_to_short_array(resampledOffset + (processedSamples * channels),
                                     shortData, inputSamples) ;
            outputBytes = faacEncEncode(encoderHandle,
                                       (int32_t*) shortData,
                                        inputSamples,
                                        faacBuf,
                                        maxOutputBytes);
            delete [] shortData;
#else
            outputBytes = faacEncEncode(encoderHandle,
                                       (int32_t*) &resampledOffset[processedSamples*channels],
                                        inputSamples,
                                        faacBuf,
                                        maxOutputBytes);
#endif
            getSink()->write(faacBuf, outputBytes);
            processedSamples+=inputSamples/channels;
        }

        if (processedSamples && (int) resampledOffsetSize >= processedSamples) {
            resampledOffsetSize -= processedSamples;
            //move least part of resampled data to beginning
            if(resampledOffsetSize)
#ifdef HAVE_SRC_LIB
                resampledOffset = (float *) memmove(resampledOffset, &resampledOffset[processedSamples*channels],
                                                    resampledOffsetSize*channels*sizeof(float));
#else
                resampledOffset = (short *) memmove(resampledOffset, &resampledOffset[processedSamples*channels],
                                                    resampledOffsetSize*sampleSize);
#endif
        }
    } else {
        while (processedSamples < samples) {
            int     outputBytes;
            int     inSamples = samples - processedSamples < (int) inputSamples
                              ? samples - processedSamples
                              : inputSamples;

            outputBytes = faacEncEncode(encoderHandle,
                                       (int32_t*) (b + processedSamples/sampleSize),
                                        inSamples,
                                        faacBuf,
                                        maxOutputBytes);
            getSink()->write(faacBuf, outputBytes);

            processedSamples += inSamples;
        }
    }

    delete[] faacBuf;

    return samples * sampleSize;
}


/*------------------------------------------------------------------------------
 *  Flush the data from the encoder
 *----------------------------------------------------------------------------*/
void
FaacEncoder :: flush ( void )
                                                            throw ( Exception )
{
    if ( !isOpen() ) {
        return;
    }

    getSink()->flush();
}


/*------------------------------------------------------------------------------
 *  Close the encoding session
 *----------------------------------------------------------------------------*/
void
FaacEncoder :: close ( void )                           throw ( Exception )
{
    if ( isOpen() ) {
        flush();
        faacEncClose(encoderHandle);
        faacOpen = false;

        getSink()->close();
    }
}


#endif // HAVE_FAAC_LIB