file.c

struct Codec
{
	*int (*encode)(*int);
	*int (*decode)(*int);
};


*int h264_encode(int *bytes)
{
// ...
}

*int h264_decode(int *bytes)
{
// ...
}

struct Codec av1 =
{
	.encode = av1_encode,
	.decode = av1_decode
};

struct Codec h264 =
{
	.encode = h264_encode,
	.decode = h264_decode
};

int main(int argc, char *argv[])
{
	h264.encode(argv[1]);
}