Add flv.hexpat (#401)

* Add flv.hexpat

https://veovera.org/docs/enhanced/enhanced-rtmp-v2#flv-file-format-overview

* test flv.hexpat

* Update README.md

add flv patterns

* Update flv.hexpat

Optimize spaces

* Update flv.hexpat

fix

README.md

@@ -77,6 +77,7 @@ Everything will immediately show up in ImHex's Content Store and gets bundled wi
 | File System | `application/x-ima` | [`patterns/fs/pattern.hexpat`](patterns/fs/pattern.hexpat) | Drive File System |
 | FLAC | `audio/flac` | [`patterns/flac.hexpat`](patterns/flac.hexpat) | Free Lossless Audio Codec, FLAC Audio Format |
 | FLC/FLIC | | [`patterns/flc.hexpat`](patterns/flc.hexpat) | FLC/FLIC animation file |
+| FLV | | [`patterns/flv.hexpat`](patterns/flv.hexpat) | FLv animation file |
 | Flipper Zero Settings | | [`patterns/flipper_settings.hexpat`](patterns/flipper_settings.hexpat) | Flipper Zero Settings Files |
 | GB | `application/x-gameboy-rom` | [`patterns/gb.hexpat`](patterns/gb.hexpat) | Game Boy ROM |
 | GBA | `application/x-gameboy-advance-rom` | [`patterns/gba.hexpat`](patterns/gba.hexpat) | Game Boy Advance ROM header |

patterns/flv.hexpat

@@ -0,0 +1,224 @@
+#pragma author ZN123 version 1.0
+#pragma description flv Archive
+#pragma MIME video/x-flv
+#pragma magic [46 4C 56] @ 0x00
+
+// zn123@sina.com
+// https://veovera.org/docs/enhanced/enhanced-rtmp-v2#flv-file-format-overview
+
+import std.io;
+import type.base;
+import std.mem;
+import std.math;
+import std.string;
+#pragma endian big
+#pragma pattern_limit 2000000
+
+enum TypeB:u24{
+    flvSignature = 0x564C46,  // Defining flv signature
+};
+#define FLV_HEADER_FLAG_HASVIDEO  1
+#define FLV_HEADER_FLAG_HASAUDIO  4
+struct FLVHeader {
+    char signature[3]  [[color("FF0000")] ];
+    u8 version [[color("00FF00")]];
+    u8 stream_info [[color("0000FF")]]; //si->missing_streams = flags & (FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO);
+	if (stream_info & FLV_HEADER_FLAG_HASVIDEO)
+		std::print("HAS VIDEO");
+	if (stream_info & FLV_HEADER_FLAG_HASAUDIO)
+		std::print("HAS AUDIO");
+    u32 head_size [[color("FFFF00")]];
+	u32 previous_tag_size [[comment("away 0")]];
+};
+enum FLV_TAG_TYPE : u8 {
+  FLV_TAG_TYPE_AUDIO = 8,
+  FLV_TAG_TYPE_VIDEO = 9,
+  FLV_TAG_TYPE_META = 18
+};
+#define FLV_AUDIO_CODECID_MASK 0xf0
+#define FLV_VIDEO_CODECID_MASK    0x0f
+#define FLV_VIDEO_FRAMETYPE_MASK  0x70
+#define FLV_VIDEO_FRAMETYPE_OFFSET   4
+//  type = (avio_r8(s->pb) & 0x1F);
+//  dts  = avio_rb24(s->pb);
+//  dts |= (unsigned)avio_r8(s->pb) << 24;
+struct BaseTag{
+	// if (std::mem::eof()) break;
+	u8	TagType;
+	u24 offset  [[comment("offset+11 = taglen")]];
+	u24 Timestamp;
+	u8  TimestampExtended;
+	u24 StreamID [[comment("away 0")]];
+	// std::print("TagType= {}",TagType & 0x1F );
+	// std::print("offset= {}",offset + 11);
+	// std::print("dts={},{}, {}",Timestamp,TimestampExtended,Timestamp + (TimestampExtended<<3));
+};
+enum AMFDataType:u8 {
+    AMF_DATA_TYPE_NUMBER      = 0x00,
+    AMF_DATA_TYPE_BOOL        = 0x01,
+    AMF_DATA_TYPE_STRING      = 0x02,
+    AMF_DATA_TYPE_OBJECT      = 0x03,
+    AMF_DATA_TYPE_NULL        = 0x05,
+    AMF_DATA_TYPE_UNDEFINED   = 0x06,
+    AMF_DATA_TYPE_REFERENCE   = 0x07,
+    AMF_DATA_TYPE_MIXEDARRAY  = 0x08,
+    AMF_DATA_TYPE_OBJECT_END  = 0x09,
+    AMF_DATA_TYPE_ARRAY       = 0x0a,
+    AMF_DATA_TYPE_DATE        = 0x0b,
+    AMF_DATA_TYPE_LONG_STRING = 0x0c,
+    AMF_DATA_TYPE_UNSUPPORTED = 0x0d,
+};
+
+#define TYPE_ONTEXTDATA 1
+#define TYPE_ONCAPTION 2
+#define TYPE_ONCAPTIONINFO 3
+#define TYPE_UNKNOWN 9
+
+fn flv_read_metabody(auto offset){
+	u8 flags =  std::mem::read_unsigned($ , 1, std::mem::Endian::Big);
+	u64 startOffset = $;
+	u64 endOffset = $ + offset;
+	std::print("metabody {},{}",startOffset,endOffset);
+	if (flags != AMFDataType::AMF_DATA_TYPE_STRING){ 
+		return TYPE_UNKNOWN; 
+	}
+	
+	u16 len = std::mem::read_unsigned($+1 , 2, std::mem::Endian::Big);
+	if (len > endOffset) return 0;
+	str name = std::mem::read_string($+3,len);
+	std::print("AMF_DATA_TYPE_STRING {} {}",len,name);
+
+	if (std::string::contains(name, "onMetaData")) {
+        std::print("onMetaData");
+    } else if (std::string::contains(name, "onTextData")) {
+		std::print("onTextData");
+    } else if (std::string::contains(name, "onCaption")) {
+		std::print("onCaption");
+    } else if (std::string::contains(name, "onCaptionInfo")) {
+		std::print("onCaptionInfo");
+    } else if (std::string::contains(name, "onTextData")) {
+		std::print("onTextData");
+    } else {
+        std::error("Invalid DataEntryBox");
+    }
+	return flags;
+};
+/***
+//#define FLV_AUDIO_CODECID_OFFSET  4
+enum FLV_CODECID:u8{
+    FLV_CODECID_PCM                  = 0,
+    FLV_CODECID_ADPCM                = 1 ,
+    FLV_CODECID_MP3                  = 2 ,
+    FLV_CODECID_PCM_LE               = 3 ,
+    FLV_CODECID_NELLYMOSER_16KHZ_MONO = 4 ,
+    FLV_CODECID_NELLYMOSER_8KHZ_MONO = 5 ,
+    FLV_CODECID_NELLYMOSER           = 6 ,
+    FLV_CODECID_PCM_ALAW             = 7 ,
+    FLV_CODECID_PCM_MULAW            = 8 ,
+    FLV_CODECID_OPUS                 = 9 ,//china//1001
+    FLV_CODECID_AAC                  = 10,//1010
+    FLV_CODECID_SPEEX                = 11,//11<< FLV_AUDIO_CODECID_OFFSET,1011
+};
+***/
+bitfield FLVTagAudio_flags {
+    audio_codecid  	: 4;
+    sample_rate     : 2; //3:44100 2:22k 1:11 0:5.5 [AAC away 3]
+    channels   		: 1 [[format("format_channels")]]; //0 mono ,1 stereo [AAC away 1]
+	bits_per_coded_sample   	: 1; //0 8bit,1 16bit 
+} [[inline]];
+
+fn format_channels(u8 value) {
+    return value;
+};
+struct FLVTagAudio{
+	FLVTagAudio_flags flags;
+	u8 data[parent.offset-1] [[sealed]];
+};
+/***
+enum FrameType:u8{
+    FLV_FRAME_KEY            = 1 , ///< key frame (for AVC, a seekable frame) 001
+    FLV_FRAME_INTER          = 2 , ///< inter frame (for AVC, a non-seekable frame) 010
+    FLV_FRAME_DISP_INTER     = 3 , ///< disposable inter frame (H.263 only) 011
+    FLV_FRAME_GENERATED_KEY  = 4 , ///< generated key frame (reserved for server use only) 100
+    FLV_FRAME_VIDEO_INFO_CMD = 5 , ///< video info/command frame 101
+};
+enum {
+    FLV_CODECID_H263    = 2,
+    FLV_CODECID_SCREEN  = 3,
+    FLV_CODECID_VP6     = 4,
+    FLV_CODECID_VP6A    = 5,
+    FLV_CODECID_SCREEN2 = 6,
+    FLV_CODECID_H264    = 7,
+    FLV_CODECID_REALH263= 8,
+    FLV_CODECID_MPEG4   = 9,
+	FLV_CODECID_HEVC    = 12, //china
+    FLV_CODECID_AV1     = 13, //china
+    FLV_CODECID_VP8     = 14, //china
+    FLV_CODECID_VP9     = 15, //china
+};
+enum {
+    PacketTypeSequenceStart         = 0,
+    PacketTypeCodedFrames           = 1,
+    PacketTypeSequenceEnd           = 2,
+    PacketTypeCodedFramesX          = 3,
+    PacketTypeMetadata              = 4,
+    PacketTypeMPEG2TSSequenceStart  = 5,
+};
+***/
+bitfield FLVTagVideo_flags {
+	enhanced_flv	: 1;
+    FrameType  		: 3;
+    video_codecid   : 4; 
+} [[inline]];
+bitfield FLVTagVideoEXT_flags {
+	enhanced_flv	: 1;
+    FrameType  		: 3;
+    PacketType   : 4;
+} [[inline]];
+
+struct FLVTagVideo{
+	FLVTagVideo_flags flags;
+	u8 PacketType;
+	u8 data[parent.offset-1-1] [[sealed]];
+};
+struct FLVTagVideoExt{
+	FLVTagVideoEXT_flags flags;
+	char video_codecid[4];
+	u8 data[parent.offset-1-4] [[sealed]];
+};
+
+struct FLVTag: BaseTag{
+	try {
+		u8 type =(TagType & 0x1F);
+		if (type == FLV_TAG_TYPE::FLV_TAG_TYPE_META){
+			std::print("___FLV_TAG_TYPE::FLV_TAG_TYPE_META");
+			// flv_read_metabody(offset);
+			u8  data[offset] [[sealed]];
+		}else if (type == FLV_TAG_TYPE::FLV_TAG_TYPE_VIDEO){
+			u8 ext = std::mem::read_unsigned($ , 1, std::mem::Endian::Big);
+			ext = (ext &  0x80) >> 7;
+			if (ext == 1){
+				FLVTagVideoExt tagVideoExt;
+			}else{
+				FLVTagVideo tagVideo;
+			}
+		}else if (type == FLV_TAG_TYPE::FLV_TAG_TYPE_AUDIO){	
+			//u8  data[offset] [[sealed]];
+			FLVTagAudio tagAudio;
+		}else{
+			std::print("___FLV_TAG_TYPE::UNKOWN");		
+			u8  data[offset] [[sealed]];
+		}
+		u32 previous_tag_size;
+	} catch {
+        std::warning("Invalid sample payload at chunk");
+		break;
+	}
+} [[name(std::format("FLVTag({})", TagType))]];
+
+struct FLV {
+   FLVHeader flvheader;
+   FLVTag flvtag[while(!std::mem::eof())];
+};
+
+FLV flv @ 0x00 [[inline]];