Exemplo n.º 1
0
bool readReference(IBitStream& bstr, unsigned& reference, unsigned huffmanNumber) {
    int code = bstr.read(2);
    if (code == 3) {
        reference = bstr.read(32);
        return true;
    }
    int bitlen = BitLength(huffmanNumber);
    assert(bitlen >= 2);
    reference = (code << (bitlen - 2)) | bstr.read(bitlen - 2);
    return true;
}
Exemplo n.º 2
0
bool LPCMStream::Probe(IBitStream &bs )
{
    char *last_dot = strrchr( bs.StreamName(), '.' );
    return 
        last_dot != NULL 
        && strcmp( last_dot+1, "lpcm") == 0;

}
Exemplo n.º 3
0
std::u16string DictionaryReader::decodeArticle(IBitStream &bstr, unsigned reference) {
    loadDecoder();
    bstr.seek(header().articlesOffset + reference);
    std::u16string body;
    bool res = decoder()->DecodeArticle(&bstr, body);
    if (!res)
        throw std::runtime_error("can't decode article");
    return body;
}
Exemplo n.º 4
0
void LenTable::Read(IBitStream &bitstr) {
    symidx2nodeidx.clear();
    nodes.clear();

    int count = bitstr.read(32);
    int bitsPerLen = bitstr.read(8);
    int idxBitSize = BitLength(count);

    symidx2nodeidx.resize(count);
    for (unsigned& nodeIdx : symidx2nodeidx) {
        nodeIdx = -1; // in case the root has a leaf as a child
    }
    nodes.resize(count - 1);
    int rootIdx = nodes.size() - 1;
    nodes.at(rootIdx) = {0,0,-1,-1};
    nextNodePosition = 0;
    for (int i = 0; i < count; ++i) {
        int symidx = bitstr.read(idxBitSize);
        int len = bitstr.read(bitsPerLen);
        placeSymidx(symidx, rootIdx, len);
    }
}
Exemplo n.º 5
0
std::vector<ArticleHeading> collectHeadingFromPage(IBitStream& bstr, DictionaryReader& reader, unsigned pageNumber) {
    std::vector<ArticleHeading> res;
    bstr.seek(reader.header().pagesOffset + 512 * pageNumber);
    CachePage page;
    page.loadHeader(bstr);
    if (page.isLeaf()) {
        std::u16string prefix;
        for (size_t idx = 0; idx < page.headingsCount(); ++idx) {
            ArticleHeading h;
            h.Load(*reader.decoder(), bstr, prefix);
            res.push_back(h);
        }
    }
    return res;
}
Exemplo n.º 6
0
int LenTable::Decode(IBitStream &bitstr, unsigned &symIdx) const {
    const HuffmanNode* node = &nodes.back();
    int len = 0;
    for (;;) {
        len++;
        int bit = bitstr.read(1);
        if (bit) { // right
            if (node->right < 0) { // leaf
                symIdx = -1 - node->right;
                return len;
            }
            node = &nodes.at(node->right - 1);
        } else { // left
            if (node->left < 0) { // leaf
                symIdx = -1 - node->left;
                return len;
            }
            node = &nodes.at(node->left - 1);
        }
    }
    // unreachable
}
Exemplo n.º 7
0
bool DTSStream::Probe(IBitStream &bs )
{
    return bs.GetBits(32) == DTS_SYNCWORD;
}
Exemplo n.º 8
0
void MultiplexJob::SetupInputStreams( std::vector< IBitStream *> &inputs )
{
    IBitStream *bs;
    IBitStreamUndo undo;
    unsigned int i;
    bool bad_file = false;

    for( i = 0; i < inputs.size(); ++i )
    {
        bs = inputs[i];
        // Remember the streams initial state...
        bs->PrepareUndo( undo );
        if( LPCMStream::Probe( *bs ) )
        {
            mjpeg_info ("File %s looks like an LPCM Audio stream.",
                        bs->StreamName());
            bs->UndoChanges( undo );
            streams.push_back( new JobStream( bs,  LPCM_AUDIO) );
            ++audio_tracks;
            ++lpcm_tracks;
            continue;
        }

        bs->UndoChanges( undo );
        if( MPAStream::Probe( *bs ) )
        {
            mjpeg_info ("File %s looks like an MPEG Audio stream.",
                        bs->StreamName() );
            bs->UndoChanges( undo );
            streams.push_back( new JobStream( bs, MPEG_AUDIO) );
            ++audio_tracks;
            continue;
        }

        bs->UndoChanges( undo );
        if( AC3Stream::Probe( *bs ) )
        {
            mjpeg_info ("File %s looks like an AC3 Audio stream.",
                        bs->StreamName());
            bs->UndoChanges( undo );
            streams.push_back( new JobStream( bs, AC3_AUDIO) );
            ++audio_tracks;
            continue;
        }

        bs->UndoChanges( undo );
        if( DTSStream::Probe( *bs ) )
        {
            mjpeg_info ("File %s looks like a dts Audio stream.",
                        bs->StreamName());
            bs->UndoChanges( undo);
            streams.push_back( new JobStream( bs, DTS_AUDIO) );
            ++audio_tracks;
            continue;
        }

        bs->UndoChanges( undo );
        if( VideoStream::Probe( *bs ) )
        {
            mjpeg_info ("File %s looks like an MPEG Video stream.",
                        bs->StreamName());
            bs->UndoChanges( undo );
            streams.push_back( new JobStream( bs, MPEG_VIDEO) );
            ++video_tracks;
            continue;
        }

        bs->UndoChanges( undo );

        if( SUBPStream::Probe( *bs ) )
        {
            mjpeg_info ("File %s looks like an Subpicture stream.",
                        bs->StreamName());
            bs->UndoChanges( undo );
            streams.push_back( new JobStream( bs, SUBP_STREAM) );
            ++subtitle_tracks;
            continue;
        }


#ifdef ZALPHA
        if( ZAlphaStream::Probe( *bs ) )
        {
            mjpeg_info ("File %s looks like an Z/Alpha Video stream.",
                        bs->StreamName());
            bs->UndoChanges( undo );
            streams.push_back( new JobStream( bs, Z_ALPHA) );
            ++video_tracks;
            ++z_alpha_tracks;
            continue;
        }
#endif
        bad_file = true;
        mjpeg_error ("File %s unrecogniseable!", bs->StreamName());
        delete bs;
    }

    if( bad_file )
    {
        mjpeg_error_exit1( "Unrecogniseable file(s)... exiting.");
    }

    //
    // Where no parameters for streams have been specified
    // simply set the default values (these will depend on the format
    // we're muxing of course...)
    //

    for( i = video_param.size(); i < video_tracks; ++i )
    {
        video_param.push_back(VideoParams::Default( mux_format ));
    }
    for( i = lpcm_param.size(); i < lpcm_tracks; ++i )
    {
        lpcm_param.push_back(LpcmParams::Default(mux_format));
    }
    for( i = subtitle_params.size(); i < subtitle_tracks; ++i )
    {
        subtitle_params.push_back(SubtitleStreamParams::Default(mux_format));
    }


    //
    // Set standard values if the selected profile implies this...
    //
    for( i = 0; i <video_tracks; ++i )
    {
        if( video_param[i]->Force(mux_format) )
        {
            mjpeg_info( "Video stream %d: profile %d selected - ignoring non-standard options!", i, mux_format );
        }
    }

    mjpeg_info( "Found %d audio streams, %d video streams and %d subtitle streams",
                audio_tracks,
                video_tracks,
                subtitle_tracks
              );

}
Exemplo n.º 9
0
bool MPAStream::Probe(IBitStream &bs )
{
    return bs.GetBits(11) == AUDIO_SYNCWORD;
}
Exemplo n.º 10
0
bool VideoStream::Probe(IBitStream &bs )
{
    return bs.GetBits( 32)  == 0x1b3;
}