C++ Get_B1函数代码示例

//---------------------------------------------------------------------------
void File_Sdp::Header_Parse()
{
    //Parsing
    int8u Length, FormatCode;
    Skip_B2(                                                    "Identifier");
    Get_B1 (Length,                                             "Length");
    Get_B1 (FormatCode,                                         "Format Code");
    for (int8u Pos=0; Pos<5; Pos++)
    {
        FieldLines[Pos]=0;
        #if MEDIAINFO_TRACE
            Element_Begin1("Field/Line");
            BS_Begin();
            Info_SB(   Field,                                   "Field Number");
            Info_S1(2, Reserved,                                "Reserved");
            Info_S1(5, Line,                                    "Line Number");
            BS_End();
            FieldLines[Pos]=((Field?1:0)<<7) |(Reserved<<5) | Line; //Removing field information ((Field?1:0)<<7) |
            if (FieldLines[Pos])
            {
                Element_Info1(Field?2:1);
                Element_Info1(Line);
            }
            else
                Element_Info1("None");
            Element_End0();
        #else //MEDIAINFO_TRACE
            Get_B1(FieldLines[Pos],                             "Field/Line");
            FieldLines[Pos]&=0x7F; //Removing field information
        #endif //MEDIAINFO_TRACE
    }

    Header_Fill_Size(3+Length);
}

//---------------------------------------------------------------------------
void File_Dpx::GenericSectionHeader_Dpx_ImageElement()
{
    Element_Begin1("image element");
    int8u Descriptor, TransferCharacteristic, ColorimetricSpecification, BitDephs;
    Info_B4(DataSign,                                           "Data sign");Param_Info1((DataSign==0?"unsigned":"signed"));
    Skip_B4(                                                    "Reference low data code value");
    Skip_BF4(                                                   "Reference low quantity represented");
    Skip_B4(                                                    "Reference high data code value");
    Skip_BF4(                                                   "Reference high quantity represented");
    Get_B1 (Descriptor,                                         "Descriptor");Param_Info1(DPX_Descriptors(Descriptor));
    Get_B1 (TransferCharacteristic,                             "Transfer characteristic");Param_Info1(DPX_TransferCharacteristic(TransferCharacteristic));
    Get_B1 (ColorimetricSpecification,                          "Colorimetric specification");Param_Info1(DPX_ColorimetricSpecification(ColorimetricSpecification));
    Get_B1 (BitDephs,                                           "Bit depth");Param_Info1(DPX_ValidBitDephs(BitDephs));
    Info_B2(ComponentDataPackingMethod,                         "Packing");Param_Info1((ComponentDataPackingMethod<8?DPX_ComponentDataPackingMethod[ComponentDataPackingMethod]:"invalid"));
    Info_B2(ComponentDataEncodingMethod,                        "Encoding");Param_Info1((ComponentDataEncodingMethod<8?DPX_ComponentDataEncodingMethod[ComponentDataEncodingMethod]:"invalid"));
    Skip_B4(                                                    "Offset to data");
    Skip_B4(                                                    "End-of-line padding");
    Skip_B4(                                                    "End-of-image padding");
    Skip_UTF8(32,                                               "Description of image element");
    Element_End0();

    FILLING_BEGIN();
        if (Frame_Count==0)
        {
            Fill(StreamKind_Last, StreamPos_Last, "ColorSpace", DPX_Descriptors_ColorSpace(Descriptor));
            Fill(StreamKind_Last, StreamPos_Last, "ChromaSubsampling", DPX_Descriptors_ChromaSubsampling(Descriptor));
            Fill(StreamKind_Last, StreamPos_Last, "BitDepth", BitDephs);
            Fill(StreamKind_Last, StreamPos_Last, "colour_description_present", "Yes");
            Fill(StreamKind_Last, StreamPos_Last, "colour_primaries", DPX_TransferCharacteristic(TransferCharacteristic));
            Fill(StreamKind_Last, StreamPos_Last, "transfer_characteristics", DPX_ColorimetricSpecification(ColorimetricSpecification));
        }
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Mpeg4_Descriptors::Header_Parse()
{
    //Parsing
    size_t Size=0;
    int8u type, Size_ToAdd;
    Get_B1(type,                                            "type");
    if (type==0)
    {
        Header_Fill_Code(0x00, "Padding");
        Header_Fill_Size(1);
        return;
    }
    do
    {
        Get_B1(Size_ToAdd,                                  "size");
        Size=(Size<<7) | (Size_ToAdd&0x7F);
    }
    while (Size_ToAdd&0x80);

    //Filling
    Header_Fill_Code(type, Ztring().From_CC1(type));
    if (Element_Offset+Size>=Element_Size)
        Size=(size_t)(Element_Size-Element_Offset); //Found one file with too big size but content is OK, cutting the block
    Header_Fill_Size(Element_Offset+Size);
}

//---------------------------------------------------------------------------
void File_DvbSubtitle::Header_Parse()
{
    //Parsing
    int8u sync_byte;
    Get_B1 (sync_byte,                                          "sync_byte");
    switch (sync_byte)
    {
        case 0xFF : //Stuffing
                    MustFindDvbHeader=true;

                    //Filling
                    Header_Fill_Code(0xFF, "end of PES data field marker");
                    Header_Fill_Size(1);
                    return;
        default   : ; //Normal (0x0F)
    }

    int16u segment_length;
    int8u  segment_type;
    Get_B1 (segment_type,                                       "segment_type");
    Get_B2 (page_id,                                            "page_id");
    Get_B2 (segment_length,                                     "segment_length");

    //Filling
    Header_Fill_Code(segment_type);
    Header_Fill_Size(Element_Offset+segment_length);
}

//---------------------------------------------------------------------------
void File_Jpeg::APP0_AVI1()
{
    //Parsing
    int8u  FieldOrder=(int8u)-1;
    Element_Begin1("AVI1");
        if (Element_Size==16-4)
        {
            Get_B1 (FieldOrder,                                     "Field Order");
            Skip_XX(7,                                              "Zeroes");
        }
        if (Element_Size==18-4)
        {
            Get_B1 (FieldOrder,                                     "Field Order");
            Skip_B1(                                                "Zero");
            Skip_B4(                                                "Size of 1st Field");
            Skip_B4(                                                "Size of 2nd Field");
        }
    Element_End0();

    FILLING_BEGIN();
        if (Frame_Count==0 && Field_Count==0)
        {
            switch (FieldOrder)
            {
                case 0x00 : Fill(Stream_Video, 0, Video_Interlacement, "PPF"); Fill(Stream_Video, 0, Video_ScanType, "Progressive"); break;
                case 0x01 : Fill(Stream_Video, 0, Video_Interlacement, "TFF"); Fill(Stream_Video, 0, Video_ScanType, "Interlaced"); Fill(Stream_Video, 0, Video_ScanOrder, "TFF"); Height_Multiplier=2; break;
                case 0x02 : Fill(Stream_Video, 0, Video_Interlacement, "BFF"); Fill(Stream_Video, 0, Video_ScanType, "Interlaced"); Fill(Stream_Video, 0, Video_ScanOrder, "BFF"); Height_Multiplier=2; break;
                default   : ;
            }
        }
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Jpeg::SOF_()
{
    //Parsing
    int16u Height, Width;
    int8u  Resolution, Count;
    Get_B1 (Resolution,                                         "Resolution");
    Get_B2 (Height,                                             "Height");
    Get_B2 (Width,                                              "Width");
    Get_B1 (Count,                                              "Number of image components in frame");
    for (int8u Pos=0; Pos<Count; Pos++)
    {
        Skip_B1(                                                "Identifier");
        Skip_B1(                                                "sampling factor");
        Skip_B1(                                                "Quantization table destination selector");
    }

    FILLING_BEGIN();
        Stream_Prepare(Stream_General);
        Fill(Stream_General, 0, General_Format, "JPEG");
        if (Count_Get(StreamKind)==0)
            Stream_Prepare(StreamKind);
        Fill(StreamKind, 0, "Format", StreamKind==Stream_Image?"JPEG":"M-JPEG");
        Fill(StreamKind, 0, "Codec", StreamKind==Stream_Image?"JPEG":"M-JPEG");
        if (StreamKind==Stream_Image)
            Fill(Stream_Image, 0, Image_Codec_String, "JPEG"); //To Avoid automatic filling
        Fill(StreamKind, 0, "Resolution", Resolution*3);
        Fill(StreamKind, 0, "Height", Height*Height_Multiplier);
        Fill(StreamKind, 0, "Width", Width);
    FILLING_END();
}

//---------------------------------------------------------------------------
// Packet "B0"
void File_AvsV::video_sequence_start()
{
    Element_Name("video_sequence_start");

    //Parsing
    int32u bit_rate_upper, bit_rate_lower;
    Get_B1 (    profile_id,                                     "profile_id");
    Get_B1 (    level_id,                                       "level_id");
    BS_Begin();
    Get_SB (    progressive_sequence,                           "progressive_sequence");
    Get_S2 (14, horizontal_size,                                "horizontal_size");
    Get_S2 (14, vertical_size,                                  "vertical_size");
    Get_S1 ( 2, chroma_format,                                  "chroma_format");
    Skip_S1( 3,                                                 "sample_precision");
    Get_S1 ( 4, aspect_ratio,                                   "aspect_ratio"); Param_Info(AvsV_aspect_ratio[aspect_ratio]);
    Get_S1 ( 4, frame_rate_code,                                "frame_rate_code"); Param_Info(AvsV_frame_rate[frame_rate_code]);
    Get_S3 (18, bit_rate_lower,                                 "bit_rate_lower");
    Mark_1 ();
    Get_S3 (12, bit_rate_upper,                                 "bit_rate_upper");
    bit_rate=(bit_rate_upper<<18)+bit_rate_lower; Param_Info(bit_rate*8, " bps");
    Get_SB (    low_delay,                                      "low_delay");
    Mark_1 ();
    Skip_S3(18,                                                 "bbv_buffer_size");
    Skip_SB(                                                    "reserved");
    Skip_SB(                                                    "reserved");
    Skip_SB(                                                    "reserved");
    BS_End();

    //Not sure, but the 3 first official files have this
    if (Element_Size-Element_Offset)
    {
        BS_Begin();
        Mark_1();
        BS_End();
    }

    FILLING_BEGIN();
        //NextCode
        NextCode_Clear();
        NextCode_Add(0xB2); //user_data_start
        NextCode_Add(0xB3); //picture_start (I)
        NextCode_Add(0xB5); //extension_start

        //Autorisation of other streams
        Streams[0xB1].Searching_Payload=true, //video_sequence_end
        Streams[0xB2].Searching_Payload=true; //user_data_start
        Streams[0xB3].Searching_Payload=true, //picture_start (I)
        Streams[0xB4].Searching_Payload=true, //reserved
        Streams[0xB5].Searching_Payload=true; //extension_start
        Streams[0xB6].Searching_Payload=true, //picture_start (P or B)
        Streams[0xB7].Searching_Payload=true; //video_edit
        Streams[0xB8].Searching_Payload=true, //reserved

        video_sequence_start_IsParsed=true;
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Jpeg::APP0_JFFF_3B()
{
    //Parsing
    Element_Begin1("Thumbail 3 bytes per pixel");
        int8u  ThumbailX, ThumbailY;
        Get_B1 (ThumbailX,                                      "Xthumbail");
        Get_B1 (ThumbailY,                                      "Ythumbail");
        Skip_XX(3*ThumbailX*ThumbailY,                          "RGB Thumbail");
    Element_End0();
}

//---------------------------------------------------------------------------
void File_OpenMG::FileHeader_Parse()
{
    //Parsing
    int16u Size, FrameSize=0;
    int8u  Flags, CodecID, SamplingRate_Code=0, Channels_Code=0;
    bool  JointStereo=false;
    Skip_C3(                                                    "Code");
    Get_B1 (Flags,                                              "Flags");
    Get_B2 (Size,                                               "Size");
    Skip_XX(26,                                                 "Unknown");
    Get_B1 (CodecID,                                            "Coded ID"); Param_Info1(OpenMG_CodecID_Format(CodecID));
    if (CodecID<=1) //Atrac3
    {
        BS_Begin();
        Skip_S1(7,                                              "Unknown");
        Get_SB (   JointStereo,                                 "Joint Stereo");
        Get_S1 (3, SamplingRate_Code,                           "Sampling Rate"); Param_Info2(OpenMG_SamplingRate(SamplingRate_Code), " Hz");
        Get_S1 (3, Channels_Code,                               "Channels"); Param_Info2(OpenMG_Channels(Channels_Code), " channel(s)");
        Get_S2 (10, FrameSize,                                  "Frame size");
        BS_End();
    }
    Skip_XX(Size-Element_Offset,                                "Unknown");

    FILLING_BEGIN();
        if (!Status[IsAccepted])
        {
            File__Tags_Helper::Accept();

            Fill(Stream_Audio, 0, Audio_Format, OpenMG_CodecID_Format(CodecID));
            Fill(Stream_Audio, 0, Audio_Encryption, OpenMG_CodecID_Encryption(CodecID));
            int64u StreamSize=(int64u)-1;
            if (File_Size!=(int64u)-1)
            {
                StreamSize=File_Size-(Buffer_Offset+Element_Size);
                Fill(Stream_Audio, 0, Audio_StreamSize, StreamSize);
            }
            if (CodecID<=1) // Atrac3
            {
                Fill(Stream_Audio, 0, Audio_Channel_s_, OpenMG_Channels(Channels_Code));
                Fill(Stream_Audio, 0, Audio_ChannelPositions, OpenMG_ChannelPositions(Channels_Code));
                if (Channels_Code==1 && JointStereo)
                    Fill(Stream_Audio, 0, Audio_Format_Settings_Mode, "Joint Stereo");
                Fill(Stream_Audio, 0, Audio_SamplingRate, OpenMG_SamplingRate(SamplingRate_Code));

                if (CodecID==1) //Protected
                    FrameSize++; //Not sure
                FrameSize<<=3; //8-byte  blocks
                int64u BitRate=OpenMG_SamplingRate(SamplingRate_Code)*FrameSize/256;
                Fill(Stream_Audio, 0, Audio_BitRate, BitRate);
                if (StreamSize!=(int64u)-1 && BitRate)
                    Fill(Stream_Audio, 0, Audio_Duration, StreamSize*8*1000/BitRate);
            }
        }
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Jpeg::COD()
{
    //Parsing
    int16u Levels;
    int8u Style, Style2, MultipleComponentTransform;
    bool PrecinctUsed;
    Get_B1 (Style,                                              "Scod - Style");
        Get_Flags (Style, 0, PrecinctUsed,                      "Precinct used");
        Skip_Flags(Style, 1,                                    "Use SOP (start of packet)");
        Skip_Flags(Style, 2,                                    "Use EPH (end of packet header)");
    Skip_B1(                                                    "Number of decomposition levels");
    Skip_B1(                                                    "Progression order");
    Get_B2 (Levels,                                             "Number of layers");
    Info_B1(DimX,                                               "Code-blocks dimensions X (2^(n+2))"); Param_Info2(1<<(DimX+2), " pixels");
    Info_B1(DimY,                                               "Code-blocks dimensions Y (2^(n+2))"); Param_Info2(1<<(DimY+2), " pixels");
    Get_B1 (Style2,                                             "Style of the code-block coding passes");
        Skip_Flags(Style, 0,                                    "Selective arithmetic coding bypass");
        Skip_Flags(Style, 1,                                    "MQ states for all contexts");
        Skip_Flags(Style, 2,                                    "Regular termination");
        Skip_Flags(Style, 3,                                    "Vertically stripe-causal context formation");
        Skip_Flags(Style, 4,                                    "Error resilience info is embedded on MQ termination");
        Skip_Flags(Style, 5,                                    "Segmentation marker is to be inserted at the end of each normalization coding pass");
    Skip_B1(                                                    "Transform");
    Get_B1(MultipleComponentTransform,                          "Multiple component transform");
    if (PrecinctUsed)
    {
        BS_Begin();
        Skip_S1(4,                                              "LL sub-band width");
        Skip_S1(4,                                              "LL sub-band height");
        BS_End();
        for (int16u Pos=0; Pos<Levels; Pos++)
        {
            Element_Begin1("Decomposition level");
            BS_Begin();
            Skip_S1(4,                                          "decomposition level width");
            Skip_S1(4,                                          "decomposition level height");
            BS_End();
            Element_End0();
        }
    }

    FILLING_BEGIN();
        if (Frame_Count==0 && Field_Count==0)
        {
            switch (MultipleComponentTransform)
            {
                case 0x01 : Fill(StreamKind_Last, 0, "Compression_Mode", "Lossless"); break;
                case 0x02 : Fill(StreamKind_Last, 0, "Compression_Mode", "Lossy"); break;
                default   : ;
            }
        }
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Png::IHDR()
{
    //Parsing
    int32u Width, Height;
    int8u  Bit_depth, Colour_type, Compression_method, Interlace_method;
    Get_B4 (Width,                                              "Width");
    Get_B4 (Height,                                             "Height");
    Get_B1 (Bit_depth,                                          "Bit depth");
    Get_B1 (Colour_type,                                        "Colour type"); Param_Info1(Png_Colour_type(Colour_type));
    Get_B1 (Compression_method,                                 "Compression method");
    Skip_B1(                                                    "Filter method");
    Get_B1 (Interlace_method,                                   "Interlace method");

    FILLING_BEGIN_PRECISE();
        if (!Status[IsFilled])
        {
            Fill(StreamKind_Last, 0, "Width", Width);
            Fill(StreamKind_Last, 0, "Height", Height);
            int8u Resolution;
            switch (Colour_type)
            {
                case 0 : Resolution=Bit_depth; break;
                case 2 : Resolution=Bit_depth*3; break;
                case 3 : Resolution=Bit_depth; break;
                case 4 : Resolution=Bit_depth*2; break;
                case 6 : Resolution=Bit_depth*4; break;
                default: Resolution=0;
            }
            if (Resolution)
                Fill(StreamKind_Last, 0, "BitDepth", Resolution);
            switch (Compression_method)
            {
                case 0 :
                    Fill(StreamKind_Last, 0, "Format_Compression", "LZ77");
                    break;
                default: ;
            }
            switch (Interlace_method)
            {
                case 0 :
                    break;
                case 1 :
                    break;
                default: ;
            }

            Fill();
        }

        if (Config->ParseSpeed<1.0)
            Finish("PNG"); //No need of more
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_MpcSv8::EI()
{
    //Parsing
    int8u  Quality, Version1, Version2, Version3;
    bool   PNS;
    BS_Begin();
    Get_S1 (7, Quality,                                         "Quality");
    Get_SB (   PNS,                                             "PNS");
    BS_End();
    Get_B1 (Version1,                                           "Major version");
    Get_B1 (Version2,                                           "Minor version");
    Get_B1 (Version3,                                           "Build");
}

//---------------------------------------------------------------------------
void File_Png::IHDR()
{
    //Parsing
    int32u Width, Height;
    int8u  Bit_depth, Colour_type, Compression_method, Interlace_method;
    Get_B4 (Width,                                              "Width");
    Get_B4 (Height,                                             "Height");
    Get_B1 (Bit_depth,                                          "Bit depth");
    Get_B1 (Colour_type,                                        "Colour type"); Param_Info(Png_Colour_type(Colour_type));
    Get_B1 (Compression_method,                                 "Compression method");
    Skip_B1(                                                    "Filter method");
    Get_B1 (Interlace_method,                                   "Interlace method");

    FILLING_BEGIN_PRECISE();
        Fill(Stream_Image, 0, Image_Width, Width);
        Fill(Stream_Image, 0, Image_Height, Height);
        int8u Resolution;
        switch (Colour_type)
        {
            case 0 : Resolution=Bit_depth; break;
            case 2 : Resolution=Bit_depth*3; break;
            case 3 : Resolution=Bit_depth; break;
            case 4 : Resolution=Bit_depth*2; break;
            case 6 : Resolution=Bit_depth*4; break;
            default: Resolution=0;
        }
        if (Resolution)
            Fill(Stream_Image, 0, Image_BitDepth, Resolution);
        switch (Compression_method)
        {
            case 0 :
                Fill(Stream_Image, 0, Image_Format, "LZ77");
                Fill(Stream_Image, 0, Image_Codec,  "LZ77 variant");
                break;
            default: ;
        }
        switch (Interlace_method)
        {
            case 0 :
                break;
            case 1 :
                break;
            default: ;
        }

        Finish("PNG");
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_MpcSv8::SH()
{
    //Parsing
    int64u SampleCount;
    int8u  Version, SampleFrequency, ChannelCount;
    bool   MidSideStereo;
    Skip_B4(                                                    "CRC32");
    Get_B1 (Version,                                            "Version");
    Get_VS (SampleCount,                                        "Sample count");
    Skip_VS(                                                    "Beginning silence");
    BS_Begin();
    Get_S1 (3, SampleFrequency,                                 "Sample frequency"); Param_Info(Mpc_SampleFreq[SampleFrequency]);
    Skip_S1(5,                                                  "Max used bands");
    Get_S1 (4, ChannelCount,                                    "Channel count");
    Get_SB (   MidSideStereo,                                   "Mid side stereo used");
    Skip_S1(3,                                                  "Audio block frames");
    BS_End();

    //Filling
    FILLING_BEGIN();
        Fill(Stream_Audio, 0, Audio_SamplingRate, Mpc_SampleFreq[SampleFrequency]);
        if (SampleCount)
        {
            Fill(Stream_Audio, 0, Audio_SamplingCount, SampleCount);
            Fill(Stream_Audio, 0, Audio_Duration, SampleCount*1000/Mpc_SampleFreq[SampleFrequency]);
            Fill(Stream_Audio, 0, Audio_BitRate, File_Size*8*Mpc_SampleFreq[SampleFrequency]/SampleCount); //Should be more precise...
        }
        Fill(Stream_Audio, 0, Audio_Resolution, 16); //MPC support only 16 bits
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_DvbSubtitle::page_composition_segment()
{
    Element_Name("page composition segment");

    //Parsing
    Skip_B1(                                                    "page_time_out");
    BS_Begin();
    Skip_S1(4,                                                  "page_version_number");
    Skip_S1(2,                                                  "page_state");
    Skip_S1(2,                                                  "reserved");
    BS_End();
    while(Element_Offset<Element_Size)
    {
        Element_Begin1("Region");
        int16u region_horizontal_address, region_vertical_address;
        int8u region_id;
        Get_B1 (region_id,                                      "region_id");
        Skip_B1(                                                "reserved");
        Get_B2 (region_horizontal_address,                      "region_horizontal_address");
        Get_B2 (region_vertical_address,                        "region_vertical_address");
        Element_End0();

        FILLING_BEGIN();
            subtitle_streams[subtitle_stream_id].pages[page_id].regions[region_id].page_composition_segment=true;
            subtitle_streams[subtitle_stream_id].pages[page_id].regions[region_id].region_horizontal_address=region_horizontal_address;
            subtitle_streams[subtitle_stream_id].pages[page_id].regions[region_id].region_vertical_address=region_vertical_address;
        FILLING_END();
    }
}