shithub: treason

ref: 82829c55c5faa242557a6effe7b0d4be7194bbac
dir: /misc.c/

#include <u.h>
#include <libc.h>
#include <tos.h>
#include "misc.h"
#include "stream.h"

int nproc, debug;

static char *fmts[Numfmt] = {
	[FmtAAC]  = "aac",
	[FmtAV1]  = "av1",
	[FmtFlac] = "flac",
	[FmtH264] = "h264",
	[FmtMp3]  = "mp3",
	[FmtOpus] = "opus",
	[FmtSrt]  = "srt",
	[FmtVP8]  = "vp8",
	[FmtVP9]  = "vp9",
};

int
str2fmt(char *s)
{
	int i;

	for(i = 0; i < nelem(fmts); i++){
		if(fmts[i] != nil && strcmp(fmts[i], s) == 0)
			return i;
	}

	return -1;
}

char *
fmt2str(int fmt)
{
	if(fmt >= 0 && fmt < nelem(fmts))
		return fmts[fmt];

	return "???";
}

uvlong
nanosec(void)
{
	static uvlong fasthz, xstart;
	uvlong x, div;

	if(fasthz == ~0ULL)
		return nsec() - xstart;

	if(fasthz == 0){
		fasthz = _tos->cyclefreq;
		if(fasthz == 0){
			fasthz = ~0ULL;
			xstart = nsec();
			fprint(2, "cyclefreq not available, falling back to nsec()\n");
			fprint(2, "you might want to disable aux/timesync\n");
		}else{
			cycles(&xstart);
		}
		return 0;
	}
	cycles(&x);
	x -= xstart;

	/* this is ugly */
	for(div = 1000000000ULL; x < 0x1999999999999999ULL && div > 1 ; div /= 10ULL, x *= 10ULL);

	return x / (fasthz / div);
}

void
nsleep(uvlong ns)
{
#define Nmsec 1000000ULL
	uvlong start, end;

	start = nanosec();
	end = start + ns;
	ns = start;
	do{
		if(end - ns > 85*Nmsec)
			sleep(80);
		else if (end - ns > 25*Nmsec)
			sleep(20);
		else if (end - ns > 1*Nmsec)
			sleep(1);
		else
			break;
		ns = nanosec();
	}while(ns < end);
}