enum {	Nodump = -1,	Dumpaudio = -2,	Dumpvideo = -3, 	FmtAv01 = 0x61763031u,	FmtAvc1 = 0x61766331u,	FmtMp4a = 0x6d703461u,	FmtOpus = 0x6f707573u,	FmtVp08 = 0x76703038u,	FmtVp09 = 0x76703039u, 	/* fake ones, not supposed to show up in a mp4 */	FmtVorbis = 0x766f7262u,	FmtSrt = 0x00737274u, /* srt subtitles */	FmtMp3 = 0x006d7033u,	FmtTheora = 0x74687261u,	FmtFlac = 0x666c6163u,	FmtAss = 0x00617373u, /* ass subtitles */}; #define min(a,b) ((a)<=(b)?(a):(b)) extern Biobuf stderr, out;extern int dflag, trackdump; #pragma varargck type "T" u32intint isotypefmt(Fmt *f); #pragma varargck type "P" uvlongint srttsfmt(Fmt *f); int isorun(Biobuf *f);int matroskarun(Biobuf *f); u32int crc32(u32int init, u8int *d, ulong len);