ImHex pattern for FLV files

flv.hexpat

#pragma endian big

struct Header {
    char signature[3];
    u8 version;
    u8 flags;
    u32 data_offset;
};

struct ScriptDataString {
    u16 len;
    char data[len];
};

struct ScriptDataObject {
    ScriptDataString name;
};

struct ScriptData {
    ScriptDataObject objects[1];
};

bitfield AudioHeader {
    format: 4;
    rate: 2;
    size: 1;
    type: 1;
};
struct AudioData {
    AudioHeader header;
    if (header.format == 10) {
        u8 aac_packet_type;
    }
};

bitfield VideoHeader {
    frame_type: 4;
    codec_id: 4;
};
struct VideoData {
    VideoHeader header;
};
struct UnknownData {};

struct Tag {
    u32 prev_tag_size;
    u8 type;
    u24 data_size;
    u24 timestamp;
    u8 timestamp_ext;
    u24 stream_id;
    
    if (type == 8) {
        AudioData data;
    } else if (type == 9) {
        VideoData data;
    } else if (type == 18) {
        ScriptData data;
    } else {
        UnknownData data;
    }
    
    padding[data_size - sizeof(data)];
};

Header header @ 0x00;
Tag tag[10] @ 0x09;