#ifndef _MEDIA_HELPER_H_
#define _MEDIA_HELPER_H_

#include <stdint.h>
#include <sys/time.h>
#include <algorithm>

#define MH_SUBSAMPLE1(v, a) ((((v) + (a) - 1)) / (a))
#define MH_SUBSAMPLE2(v, a, s) (v < 0) ? (-((-v + a) >> s)) : ((v + a) >> s)

#define MH_F_Z 0.00000001f //0.000000001f
#define MH_F_LT(x1, x2) (x1 < x2) //#todo
#define MH_F_GT(x1, x2) (x1 > x2)
#define MH_F_LTEQ(x1, x2) (x1 <= x2)
#define MH_F_GTEQ(x1, x2) (x1 >= x2)
#define MH_F_ZEQ(x) (x + MH_F_Z > 0.0f && x - MH_F_Z < 0.0f)

inline void microseconds_to_timeval(uint64_t v1, timeval& v2)
{
	v2.tv_sec = v1 / 1000 / 1000;
	v2.tv_usec = v1 % 1000;
}

inline timeval microseconds_to_timeval(uint64_t v1)
{
	timeval v2;
	v2.tv_sec = v1 / 1000 / 1000;
	v2.tv_usec = v1 % 1000;
	return v2;
}

inline uint64_t timeval_to_microseconds(const timeval& v2)
{
	return (v2.tv_sec * 1000 * 1000 + v2.tv_usec);
}

template<typename TPoolPtr, typename TPoolElem>
struct PoolElemLocker
{
	TPoolPtr pool;
	TPoolElem elem;
	PoolElemLocker(TPoolPtr _pool, TPoolElem _elem) : pool(_pool), elem(_elem)
	{
		
	}
	~PoolElemLocker()
	{
		pool->release(elem);
		pool->notify_free();
	}
};

template<typename TArrayPtr>
struct ArrayDeleter
{
	TArrayPtr array;
	ArrayDeleter(TArrayPtr _array) : array(_array)
	{
		
	}
	~ArrayDeleter()
	{
		delete[] array;
	}
};

template<typename T>
struct ScopeLocker;

template<>
struct ScopeLocker<pthread_mutex_t>
{
    pthread_mutex_t* mut;
	ScopeLocker(pthread_mutex_t* _mut) : mut(_mut) { if (mut) pthread_mutex_lock(mut); }
    ~ScopeLocker(){ if (mut) pthread_mutex_unlock(mut); }
};

uint8_t* base64_decode(char const* in, size_t inSize, size_t& resultSize, bool trimTrailingZeros = true);
char* base64_encode(char const* orig, size_t origLength);

class SPropRecord;
SPropRecord* parseSPropParameterSets(char const* sPropParameterSetsStr, int& numSPropRecords);

template <typename T>
T clamp(const T& n, const T& n1, const T& n2)
{
	if (n1 < n2)
	{
		if (n < n1) return n1;
		else if(n > n2) return n2;
		else return n;
	}
	else
	{
		if (n < n2) return n1;
		else if(n > n1) return n2;
		else return n;
	}
	return n;
}

#endif