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/* $Id$ */
/** @file driver.h */
#ifndef DRIVER_H
#define DRIVER_H
#include "debug.h"
#include "helpers.hpp"
#include "string.h"
#include <string>
#include <map>
bool GetDriverParamBool(const char * const *parm, const char *name);
int GetDriverParamInt(const char * const *parm, const char *name, int def);
class Driver {
public:
virtual const char *Start(const char * const *parm) = 0;
virtual void Stop() = 0;
virtual ~Driver() { }
enum Type {
DT_BEGIN = 0,
DT_SOUND = 0,
DT_MUSIC,
DT_VIDEO,
DT_END,
};
};
DECLARE_POSTFIX_INCREMENT(Driver::Type);
class DriverFactoryBase {
private:
Driver::Type type;
char *name;
int priority;
typedef std::map<std::string, DriverFactoryBase *> Drivers;
static Drivers &GetDrivers()
{
static Drivers &s_drivers = *new Drivers();
return s_drivers;
}
static Driver **GetActiveDriver(Driver::Type type)
{
static Driver *s_driver[3] = { NULL, NULL, NULL };
return &s_driver[type];
}
static const char *GetDriverTypeName(Driver::Type type)
{
static const char *driver_type_name[] = { "sound", "music", "video" };
return driver_type_name[type];
}
protected:
/**
* Register a driver internally, based on its name.
* @param name the name of the driver.
* @note an assert() will be trigger if 2 driver with the same name try to register.
*/
void RegisterDriver(const char *name, Driver::Type type, int priority)
{
/* Don't register nameless Drivers */
if (name == NULL) return;
this->name = strdup(name);
this->type = type;
this->priority = priority;
/* Prefix the name with driver type to make it unique */
char buf[32];
strecpy(buf, GetDriverTypeName(type), lastof(buf));
strecpy(buf + 5, name, lastof(buf));
#if !defined(NDEBUG) || defined(WITH_ASSERT)
/* NDEBUG disables asserts and gives a warning: unused variable 'P' */
std::pair<Drivers::iterator, bool> P =
#endif /* !NDEBUG */
GetDrivers().insert(Drivers::value_type(buf, this));
assert(P.second);
}
public:
DriverFactoryBase() :
name(NULL)
{}
virtual ~DriverFactoryBase() { if (this->name != NULL) GetDrivers().erase(this->name); free(this->name); }
/**
* Find the requested driver and return its class.
* @param name the driver to select.
* @post Sets the driver so GetCurrentDriver() returns it too.
*/
static Driver *SelectDriver(const char *name, Driver::Type type)
{
if (GetDrivers().size() == 0) return NULL;
if (*name == '\0') {
/* Probe for this driver */
for (int priority = 10; priority >= 0; priority--) {
Drivers::iterator it = GetDrivers().begin();
for (; it != GetDrivers().end(); ++it) {
DriverFactoryBase *d = (*it).second;
/* Check driver type */
if (d->type != type) continue;
if (d->priority != priority) continue;
Driver *newd = d->CreateInstance();
const char *err = newd->Start(NULL);
if (err == NULL) {
DEBUG(driver, 1, "Successfully probed %s driver '%s'", GetDriverTypeName(type), d->name);
delete *GetActiveDriver(type);
*GetActiveDriver(type) = newd;
return newd;
}
DEBUG(driver, 1, "Probing %s driver '%s' failed with error: %s", GetDriverTypeName(type), d->name, err);
delete newd;
}
}
error("Couldn't find any suitable %s driver", GetDriverTypeName(type));
} else {
char *parm;
char buffer[256];
const char *parms[32];
/* Extract the driver name and put parameter list in parm */
strecpy(buffer, name, lastof(buffer));
parm = strchr(buffer, ':');
parms[0] = NULL;
if (parm != NULL) {
uint np = 0;
/* Tokenize the parm. */
do {
*parm++ = '\0';
if (np < lengthof(parms) - 1)
parms[np++] = parm;
while (*parm != '\0' && *parm != ',')
parm++;
} while (*parm == ',');
parms[np] = NULL;
}
/* Find this driver */
Drivers::iterator it = GetDrivers().begin();
for (; it != GetDrivers().end(); ++it) {
DriverFactoryBase *d = (*it).second;
/* Check driver type */
if (d->type != type) continue;
/* Check driver name */
if (strcasecmp(buffer, d->name) != 0) continue;
/* Found our driver, let's try it */
Driver *newd = d->CreateInstance();
const char *err = newd->Start(parms);
if (err != NULL) {
delete newd;
error("Unable to load driver '%s'. The error was: %s", d->name, err);
}
DEBUG(driver, 1, "Successfully loaded %s driver '%s'", GetDriverTypeName(type), d->name);
delete *GetActiveDriver(type);
*GetActiveDriver(type) = newd;
return newd;
}
error("No such %s driver: %s\n", GetDriverTypeName(type), buffer);
}
}
/**
* Build a human readable list of available drivers, grouped by type.
*/
static char *GetDriversInfo(char *p, const char *last)
{
for (Driver::Type type = Driver::DT_BEGIN; type != Driver::DT_END; type++) {
p += snprintf(p, last - p, "List of %s drivers:\n", GetDriverTypeName(type));
for (int priority = 10; priority >= 0; priority--) {
Drivers::iterator it = GetDrivers().begin();
for (; it != GetDrivers().end(); it++) {
DriverFactoryBase *d = (*it).second;
if (d->type != type) continue;
if (d->priority != priority) continue;
p += snprintf(p, last - p, "%18s: %s\n", d->name, d->GetDescription());
}
}
p += snprintf(p, last - p, "\n");
}
return p;
}
/**
* Get a nice description of the driver-class.
*/
virtual const char *GetDescription() = 0;
/**
* Create an instance of this driver-class.
*/
virtual Driver *CreateInstance() = 0;
};
#endif /* DRIVER_H */
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