#include <u.h>#include <libc.h>#include <bio.h>#include "adts.h"#include "util.h" static int ratecfg[] = {	96000,	88200,	64000,	48000,	44100,	32000,	24000,	22050,	16000,	12000,	11025,	8000,	7350,	-1,	-1,	-1,}; intadtsread(Biobuf *b, ADTSFrame *f){	int ratei, i;	u8int h[7]; Again:	if(Bread(b, h, 7) != 7)		goto err;	if(h[0] != 0xff || (h[1]&0xf0) != 0xf0){		werrstr("bad sync word");		goto err;	} 	f->sz = (h[3]&3)<<11 | h[4]<<3 | h[5]>>5;	if(f->sz < 7){		werrstr("frame too small (%d bytes)", f->sz);		goto err;	}	if(f->sz > f->bufsz){		f->bufsz = f->sz*2;		f->buf = erealloc(f->buf, f->bufsz);	} 	memmove(f->buf, h, 7);	if(Bread(b, f->buf+7, f->sz-7) != f->sz-7)		goto err; 	ratei = (h[2]>>2) & 7; 	if(f->sz == 7+1+4+8 && f->buf[7] == 0x04 && memcmp(f->buf+7+1, "nsec", 4) == 0){		for(f->ns₀ = 0, i = 0; i < 8; i++)			f->ns₀ |= (uvlong)f->buf[7+1+4+i] << (i*8);		f->ns = 0;		goto Again;	} 	f->ns += 1000000000ULL * 1024ULL / ratecfg[ratei]; 	return 0; err:	werrstr("adtsread: %r");	return -1;}