//
// ZoneMinder SDP Class Implementation, $Date: 2009-04-14 21:20:02 +0100 (Tue, 14 Apr 2009) $, $Revision: 2850 $
// Copyright (C) 2001-2008 Philip Coombes
// 
// 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 "zm.h"

#if HAVE_LIBAVFORMAT

#include "zm_sdp.h"

#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(51,2,1)
SessionDescriptor::StaticPayloadDesc SessionDescriptor::smStaticPayloads[] = {
    { 0, "PCMU",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_MULAW,  8000,  1 },
    { 3, "GSM",    AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 4, "G723",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 5, "DVI4",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 6, "DVI4",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       16000, 1 },
    { 7, "LPC",    AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 8, "PCMA",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_ALAW,   8000,  1 },
    { 9, "G722",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 10, "L16",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_S16BE,  44100, 2 },
    { 11, "L16",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_S16BE,  44100, 1 },
    { 12, "QCELP", AVMEDIA_TYPE_AUDIO,   CODEC_ID_QCELP,      8000,  1 },
    { 13, "CN",    AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 14, "MPA",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_MP2,        -1,    -1 },
    { 14, "MPA",   AVMEDIA_TYPE_AUDIO,   CODEC_ID_MP3,        -1,    -1 },
    { 15, "G728",  AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 16, "DVI4",  AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       11025, 1 },
    { 17, "DVI4",  AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       22050, 1 },
    { 18, "G729",  AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 25, "CelB",  AVMEDIA_TYPE_VIDEO,   CODEC_ID_NONE,       90000, -1 },
    { 26, "JPEG",  AVMEDIA_TYPE_VIDEO,   CODEC_ID_MJPEG,      90000, -1 },
    { 28, "nv",    AVMEDIA_TYPE_VIDEO,   CODEC_ID_NONE,       90000, -1 },
    { 31, "H261",  AVMEDIA_TYPE_VIDEO,   CODEC_ID_H261,       90000, -1 },
    { 32, "MPV",   AVMEDIA_TYPE_VIDEO,   CODEC_ID_MPEG1VIDEO, 90000, -1 },
    { 32, "MPV",   AVMEDIA_TYPE_VIDEO,   CODEC_ID_MPEG2VIDEO, 90000, -1 },
    { 33, "MP2T",  AVMEDIA_TYPE_DATA,    CODEC_ID_MPEG2TS,    90000, -1 },
    { 34, "H263",  AVMEDIA_TYPE_VIDEO,   CODEC_ID_H263,       90000, -1 },
    { -1, "",      AVMEDIA_TYPE_UNKNOWN, CODEC_ID_NONE,       -1,    -1 }
};

SessionDescriptor::DynamicPayloadDesc SessionDescriptor::smDynamicPayloads[] = {
    { "MP4V-ES", AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
    { "mpeg4-generic", AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
    { "H264", AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
    { "AMR", AVMEDIA_TYPE_AUDIO, CODEC_ID_AMR_NB }
};
#else
SessionDescriptor::StaticPayloadDesc SessionDescriptor::smStaticPayloads[] = {
    { 0, "PCMU",   CODEC_TYPE_AUDIO,   CODEC_ID_PCM_MULAW,  8000,  1 },
    { 3, "GSM",    CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 4, "G723",   CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 5, "DVI4",   CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 6, "DVI4",   CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       16000, 1 },
    { 7, "LPC",    CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 8, "PCMA",   CODEC_TYPE_AUDIO,   CODEC_ID_PCM_ALAW,   8000,  1 },
    { 9, "G722",   CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 10, "L16",   CODEC_TYPE_AUDIO,   CODEC_ID_PCM_S16BE,  44100, 2 },
    { 11, "L16",   CODEC_TYPE_AUDIO,   CODEC_ID_PCM_S16BE,  44100, 1 },
    { 12, "QCELP", CODEC_TYPE_AUDIO,   CODEC_ID_QCELP,      8000,  1 },
    { 13, "CN",    CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 14, "MPA",   CODEC_TYPE_AUDIO,   CODEC_ID_MP2,        -1,    -1 },
    { 14, "MPA",   CODEC_TYPE_AUDIO,   CODEC_ID_MP3,        -1,    -1 },
    { 15, "G728",  CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 16, "DVI4",  CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       11025, 1 },
    { 17, "DVI4",  CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       22050, 1 },
    { 18, "G729",  CODEC_TYPE_AUDIO,   CODEC_ID_NONE,       8000,  1 },
    { 25, "CelB",  CODEC_TYPE_VIDEO,   CODEC_ID_NONE,       90000, -1 },
    { 26, "JPEG",  CODEC_TYPE_VIDEO,   CODEC_ID_MJPEG,      90000, -1 },
    { 28, "nv",    CODEC_TYPE_VIDEO,   CODEC_ID_NONE,       90000, -1 },
    { 31, "H261",  CODEC_TYPE_VIDEO,   CODEC_ID_H261,       90000, -1 },
    { 32, "MPV",   CODEC_TYPE_VIDEO,   CODEC_ID_MPEG1VIDEO, 90000, -1 },
    { 32, "MPV",   CODEC_TYPE_VIDEO,   CODEC_ID_MPEG2VIDEO, 90000, -1 },
    { 33, "MP2T",  CODEC_TYPE_DATA,    CODEC_ID_MPEG2TS,    90000, -1 },
    { 34, "H263",  CODEC_TYPE_VIDEO,   CODEC_ID_H263,       90000, -1 },
    { -1, "",      CODEC_TYPE_UNKNOWN, CODEC_ID_NONE,       -1,    -1 }
};

SessionDescriptor::DynamicPayloadDesc SessionDescriptor::smDynamicPayloads[] = {
    { "MP4V-ES", CODEC_TYPE_VIDEO, CODEC_ID_MPEG4 },
    { "mpeg4-generic", CODEC_TYPE_AUDIO, CODEC_ID_AAC },
    { "H264", CODEC_TYPE_VIDEO, CODEC_ID_H264 },
    { "AMR", CODEC_TYPE_AUDIO, CODEC_ID_AMR_NB }
};
#endif

SessionDescriptor::ConnInfo::ConnInfo( const std::string &connInfo ) :
    mTtl( 16 ),
    mNoAddresses( 0 )
{
    StringVector tokens = split( connInfo, " " );
    if ( tokens.size() < 3 )
        throw Exception( "Unable to parse SDP connection info from '"+connInfo+"'" );
    mNetworkType = tokens[0];
    if ( mNetworkType != "IN" )
        throw Exception( "Invalid SDP network type '"+mNetworkType+"' in connection info '"+connInfo+"'" );
    mAddressType = tokens[1];
    if ( mAddressType != "IP4" )
        throw Exception( "Invalid SDP address type '"+mAddressType+"' in connection info '"+connInfo+"'" );
    StringVector addressTokens = split( tokens[2], "/" );
    if ( addressTokens.size() < 1 ) 
        throw Exception( "Invalid SDP address '"+tokens[2]+"' in connection info '"+connInfo+"'" );
    mAddress = addressTokens[0];
    if ( addressTokens.size() >= 2 )
        mTtl = atoi(addressTokens[1].c_str());
    if ( addressTokens.size() >= 3 )
        mNoAddresses = atoi(addressTokens[2].c_str());
}

SessionDescriptor::BandInfo::BandInfo( const std::string &bandInfo ) :
    mValue( 0 )
{
    StringVector tokens = split( bandInfo, ":" );
    if ( tokens.size() < 2 )
        throw Exception( "Unable to parse SDP bandwidth info from '"+bandInfo+"'" );
    mType = tokens[0];
    //if ( mNetworkType != "IN" )
        //throw Exception( "Invalid SDP network type '"+mNetworkType+"' in connection info '"+connInfo+"'" );
    mValue = atoi(tokens[1].c_str());
}

SessionDescriptor::MediaDescriptor::MediaDescriptor( const std::string &type, int port, int numPorts, const std::string &transport, int payloadType ) :
    mType( type ),
    mPort( port ),
    mNumPorts( numPorts ),
    mTransport( transport ),
    mPayloadType( payloadType ),
    mFrameRate( 0.0 ),
    mClock( 0 ),
    mWidth( 0 ),
    mHeight( 0 ),
    mSprops( "" ),
    mConnInfo( 0 )
{
}

SessionDescriptor::SessionDescriptor( const std::string &url, const std::string &sdp ) : 
    mUrl( url ),
    mConnInfo( 0 ),
    mBandInfo( 0 )
{
    MediaDescriptor *currMedia = 0;

    StringVector lines = split( sdp, "\r\n" );
    for ( StringVector::const_iterator iter = lines.begin(); iter != lines.end(); iter++ )
    {
        std::string line = *iter;
        if ( line.empty() )
            break;

        Debug( 3, "Processing SDP line '%s'", line.c_str() );
        const char sdpType = line[0];
        if ( line[1] != '=' )
            throw Exception( "Invalid SDP format at '"+line+"'" );

        line.erase( 0, 2 );
        switch( sdpType )
        {
            case 'v' :
                mVersion = line;
                break;
            case 'o' :
                mOwner = line;
                break;
            case 's' :
                mName = line;
                break;
            case 'i' :
                mInfo = line;
                break;
            case 'c' :
                mConnInfo = new ConnInfo( line );
                break;
            case 'b' :
                mBandInfo = new BandInfo( line );
                break;
            case 't' :
                mTimeInfo = line;
                break;
            case 'a' :
            {
                mAttributes.push_back( line );
                StringVector tokens = split( line, ":", 2 );
                std::string attrName = tokens[0];
                if ( currMedia )
                {
                    if ( attrName == "control" )
                    {
                        if ( tokens.size() < 2 )
                            throw Exception( "Unable to parse SDP control attribute '"+line+"' for media '"+currMedia->getType()+"'" );
                        currMedia->setControlUrl( tokens[1] );
                    }
                    else if ( attrName == "range" )
                    {
                    }
                    else if ( attrName == "rtpmap" )
                    {
                        // a=rtpmap:96 MP4V-ES/90000
                        if ( tokens.size() < 2 )
                            throw Exception( "Unable to parse SDP rtpmap attribute '"+line+"' for media '"+currMedia->getType()+"'" );
                        StringVector attrTokens = split( tokens[1], " " );
                        int payloadType = atoi(attrTokens[0].c_str());
                        if ( payloadType != currMedia->getPayloadType() )
                            throw Exception( stringtf( "Payload type mismatch, expected %d, got %d in '%s'", currMedia->getPayloadType(), payloadType, line.c_str() ) );
                        std::string payloadDesc = attrTokens[1];
                        //currMedia->setPayloadType( payloadType );
                        if ( attrTokens.size() > 1 )
                        {
                            StringVector payloadTokens = split( attrTokens[1], "/" );
                            std::string payloadDesc = payloadTokens[0];
                            int payloadClock = atoi(payloadTokens[1].c_str());
                            currMedia->setPayloadDesc( payloadDesc );
                            currMedia->setClock( payloadClock );
                        }
                    }
                    else if ( attrName == "framesize" )
                    {
                        // a=framesize:96 320-240
                        if ( tokens.size() < 2 )
                            throw Exception( "Unable to parse SDP framesize attribute '"+line+"' for media '"+currMedia->getType()+"'" );
                        StringVector attrTokens = split( tokens[1], " " );
                        int payloadType = atoi(attrTokens[0].c_str());
                        if ( payloadType != currMedia->getPayloadType() )
                            throw Exception( stringtf( "Payload type mismatch, expected %d, got %d in '%s'", currMedia->getPayloadType(), payloadType, line.c_str() ) );
                        //currMedia->setPayloadType( payloadType );
                        StringVector sizeTokens = split( attrTokens[1], "-" );
                        int width = atoi(sizeTokens[0].c_str());
                        int height = atoi(sizeTokens[1].c_str());
                        currMedia->setFrameSize( width, height );
                    }
                    else if ( attrName == "framerate" )
                    {
                        // a=framerate:5.0
                        if ( tokens.size() < 2 )
                            throw Exception( "Unable to parse SDP framerate attribute '"+line+"' for media '"+currMedia->getType()+"'" );
                        double frameRate = atof(tokens[1].c_str());
                        currMedia->setFrameRate( frameRate );
                    }
                    else if ( attrName == "fmtp" )
                    {
                        // a=fmtp:96 profile-level-id=247; config=000001B0F7000001B509000001000000012008D48D8803250F042D14440F
                        if ( tokens.size() < 2 )
                            throw Exception( "Unable to parse SDP fmtp attribute '"+line+"' for media '"+currMedia->getType()+"'" );
                        StringVector attrTokens = split( tokens[1], " ", 2 );
                        int payloadType = atoi(attrTokens[0].c_str());
                        if ( payloadType != currMedia->getPayloadType() )
                            throw Exception( stringtf( "Payload type mismatch, expected %d, got %d in '%s'", currMedia->getPayloadType(), payloadType, line.c_str() ) );
                        //currMedia->setPayloadType( payloadType );
                        if ( attrTokens.size() > 1 )
                        {
                            StringVector attr2Tokens = split( attrTokens[1], "; " );
                            for ( unsigned int i = 0; i < attr2Tokens.size(); i++ )
                            {
                                StringVector attr3Tokens = split( attr2Tokens[i], "=" );
                                //Info( "Name = %s, Value = %s", attr3Tokens[0].c_str(), attr3Tokens[1].c_str() );
                                if ( attr3Tokens[0] == "profile-level-id" )
                                {
                                }
                                else if ( attr3Tokens[0] == "config" )
                                {
                                }
                                else if ( attr3Tokens[0] == "sprop-parameter-sets" )
                                {
                              		size_t t = attr2Tokens[i].find("=");
                              		char *c = (char *)attr2Tokens[i].c_str() + t + 1;
                              		Debug(4, "sprop-parameter-sets value %s", c);
                            		currMedia->setSprops(std::string(c));
                                }
                                else if ( attr3Tokens[0] == "sprop-parameter-sets" )
                                {
                              		size_t t = attr2Tokens[i].find("=");
                              		char *c = (char *)attr2Tokens[i].c_str() + t + 1;
                              		Debug(4, "sprop-parameter-sets value %s", c);
                            		currMedia->setSprops(std::string(c));
                                }
                                else 
                                {
                                    Debug( 3, "Ignoring SDP fmtp attribute '%s' for media '%s'", attr3Tokens[0].c_str(), currMedia->getType().c_str() )
                                }
                            }
                        }
                    }
                    else if ( attrName == "mpeg4-iod" )
                    {
                        // a=mpeg4-iod: "data:application/mpeg4-iod;base64,AoEAAE8BAf73AQOAkwABQHRkYXRhOmFwcGxpY2F0aW9uL21wZWc0LW9kLWF1O2Jhc2U2NCxBVGdCR3dVZkF4Y0F5U1FBWlFRTklCRUVrK0FBQWEyd0FBR3RzQVlCQkFFWkFwOERGUUJsQlFRTlFCVUFDN2dBQVBvQUFBRDZBQVlCQXc9PQQNAQUABAAAAAAAAAAAAAYJAQAAAAAAAAAAA0IAAkA+ZGF0YTphcHBsaWNhdGlvbi9tcGVnNC1iaWZzLWF1O2Jhc2U2NCx3QkFTZ1RBcUJYSmhCSWhRUlFVL0FBPT0EEgINAAACAAAAAAAAAAAFAwAAQAYJAQAAAAAAAAAA"
                    }
                    else if ( attrName == "mpeg4-esid" )
                    {
                        // a=mpeg4-esid:201
                    }
                    else
                    {
                        Debug( 3, "Ignoring SDP attribute '%s' for media '%s'", line.c_str(), currMedia->getType().c_str() )
                    }
                }
                else
                {
                    Debug( 3, "Ignoring general SDP attribute '%s'", line.c_str() );
                }
                break;
            }
            case 'm' :
            {
                StringVector tokens = split( line, " " );
                if ( tokens.size() < 4 )
                    throw Exception( "Can't parse SDP media description '"+line+"'" );
                std::string mediaType = tokens[0];
                if ( mediaType != "audio" && mediaType != "video" )
                    throw Exception( "Unsupported media type '"+mediaType+"' in SDP media attribute '"+line+"'" );
                StringVector portTokens = split( tokens[1], "/" );
                int mediaPort = atoi(portTokens[0].c_str());
                int mediaNumPorts = 1;
                if ( portTokens.size() > 1 )
                    mediaNumPorts = atoi(portTokens[1].c_str());
                std::string mediaTransport = tokens[2];
                if ( mediaTransport != "RTP/AVP" )
                    throw Exception( "Unsupported media transport '"+mediaTransport+"' in SDP media attribute '"+line+"'" );
                int payloadType = atoi(tokens[3].c_str());
                currMedia = new MediaDescriptor( mediaType, mediaPort, mediaNumPorts, mediaTransport, payloadType );
                mMediaList.push_back( currMedia );
                break;
            }
        }
    }
}

AVFormatContext *SessionDescriptor::generateFormatContext() const
{
    AVFormatContext *formatContext = avformat_alloc_context();

    strncpy( formatContext->filename, mUrl.c_str(), sizeof(formatContext->filename) );
/*
    if ( mName.length() )
        strncpy( formatContext->title, mName.c_str(), sizeof(formatContext->title) );
    if ( mInfo.length() )
        strncpy( formatContext->comment, mInfo.c_str(), sizeof(formatContext->comment) );
*/
    //formatContext->nb_streams = mMediaList.size();
    for ( unsigned int i = 0; i < mMediaList.size(); i++ )
    {
        const MediaDescriptor *mediaDesc = mMediaList[i];
#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(53, 8, 0)
        AVStream *stream = av_new_stream( formatContext, i );
#else
        AVStream *stream = avformat_new_stream( formatContext, NULL );
        stream->id = i;
#endif

        Debug( 1, "Looking for codec for %s payload type %d / %s",  mediaDesc->getType().c_str(), mediaDesc->getPayloadType(), mediaDesc->getPayloadDesc().c_str() );
#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(51,2,1)
        if ( mediaDesc->getType() == "video" )
            stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
        else if ( mediaDesc->getType() == "audio" )
            stream->codec->codec_type = AVMEDIA_TYPE_AUDIO;
#else
        if ( mediaDesc->getType() == "video" )
            stream->codec->codec_type = CODEC_TYPE_VIDEO;
        else if ( mediaDesc->getType() == "audio" )
            stream->codec->codec_type = CODEC_TYPE_AUDIO;
#endif

        if ( mediaDesc->getPayloadType() < PAYLOAD_TYPE_DYNAMIC )
        {
            // Look in static table
            for ( unsigned int i = 0; i < (sizeof(smStaticPayloads)/sizeof(*smStaticPayloads)); i++ )
            {
                if ( smStaticPayloads[i].payloadType == mediaDesc->getPayloadType() )
                {
                    Debug( 1, "Got static payload type %d, %s", smStaticPayloads[i].payloadType, smStaticPayloads[i].payloadName );
                    strncpy( stream->codec->codec_name, smStaticPayloads[i].payloadName, sizeof(stream->codec->codec_name) );;
                    stream->codec->codec_type = smStaticPayloads[i].codecType;
                    stream->codec->codec_id = smStaticPayloads[i].codecId;
                    stream->codec->sample_rate = smStaticPayloads[i].clockRate;
                    break;
                }
            }
        }
        else
        {
            // Look in dynamic table
            for ( unsigned int i = 0; i < (sizeof(smDynamicPayloads)/sizeof(*smDynamicPayloads)); i++ )
            {
                if ( smDynamicPayloads[i].payloadName == mediaDesc->getPayloadDesc() )
                {
                    Debug( 1, "Got dynamic payload type %d, %s", mediaDesc->getPayloadType(), smDynamicPayloads[i].payloadName );
                    strncpy( stream->codec->codec_name, smDynamicPayloads[i].payloadName, sizeof(stream->codec->codec_name) );;
                    stream->codec->codec_type = smDynamicPayloads[i].codecType;
                    stream->codec->codec_id = smDynamicPayloads[i].codecId;
                    stream->codec->sample_rate = mediaDesc->getClock();
                    break;
                }
            }
        }
        if ( !stream->codec->codec_name[0] )
        {
            Warning( "Can't find payload details for %s payload type %d, name %s", mediaDesc->getType().c_str(), mediaDesc->getPayloadType(), mediaDesc->getPayloadDesc().c_str() );
            //return( 0 );
        }
        if ( mediaDesc->getWidth() )
            stream->codec->width = mediaDesc->getWidth();
        if ( mediaDesc->getHeight() )
            stream->codec->height = mediaDesc->getHeight();
        if ( stream->codec->codec_id == CODEC_ID_H264 && mediaDesc->getSprops().size())
        {
    	    uint8_t start_sequence[]= { 0, 0, 1 };
    	    stream->codec->extradata_size= 0;
    	    stream->codec->extradata= NULL;
    	    char pvalue[1024], *value = pvalue;
	    
			strcpy(pvalue, mediaDesc->getSprops().c_str());
	    
    	    while (*value) {
        		char base64packet[1024];
        		uint8_t decoded_packet[1024];
        		uint32_t packet_size;
        		char *dst = base64packet;

        		while (*value && *value != ','
            	       && (dst - base64packet) < (long)(sizeof(base64packet)) - 1) {
            	      *dst++ = *value++;
        		}
        		*dst++ = '\0';

        		if (*value == ',')
            	    value++;

        		packet_size= av_base64_decode(decoded_packet, (const char *)base64packet, (int)sizeof(decoded_packet));
        		Hexdump(4, (char *)decoded_packet, packet_size);
        		if (packet_size) {
            		uint8_t *dest = 
            		(uint8_t *)av_malloc(packet_size + sizeof(start_sequence) +
                  		                 stream->codec->extradata_size +
                      		             FF_INPUT_BUFFER_PADDING_SIZE);
            		if(dest) {
              			if(stream->codec->extradata_size) {
                  			// av_realloc?
                			memcpy(dest, stream->codec->extradata, stream->codec->extradata_size);
                  			av_free(stream->codec->extradata);
              			}

              			memcpy(dest+stream->codec->extradata_size, start_sequence, sizeof(start_sequence));
              			memcpy(dest+stream->codec->extradata_size+sizeof(start_sequence), decoded_packet, packet_size);
              			memset(dest+stream->codec->extradata_size+sizeof(start_sequence)+
                  	  		   packet_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

              			stream->codec->extradata= dest;
              			stream->codec->extradata_size+= sizeof(start_sequence)+packet_size;
//            		} else {
//              		av_log(codec, AV_LOG_ERROR, "Unable to allocate memory for extradata!");
//                		return AVERROR(ENOMEM);
            		}
        		}
    	    }
        }
    }

    return( formatContext );
}

#endif // HAVE_LIBAVFORMAT