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<pre class="sourcecodebox">/*
dru_devices.c
Part of the Disc Recording Utility sources for command-line tools. This
code provides an example of prompting the user to select a device and/or
insert media, and how to create a textual description of a device.
*/
#include <DiscRecording/DiscRecording.h>
#include <stdlib.h>
#include "dru_devices.h"
/* DRNotificationCallback to wait for blank media. */
void druWaitForBlankMedia(DRNotificationCenterRef center,void *observer,CFStringRef name,DRTypeRef object,CFDictionaryRef info);
/* DRNotificationCallback to wait for erasable media. */
void druWaitForErasableMedia(DRNotificationCenterRef center,void *observer,CFStringRef name,DRTypeRef object,CFDictionaryRef info);
/* Standard druDeviceFilterProcs. */
int druFilter_AnyBurner(DRDeviceRef device);
int druFilter_AnyEraser(DRDeviceRef device);
int druFilter_CDBurners(DRDeviceRef device);
int druFilter_DVDBurners(DRDeviceRef device);
#pragma mark -
/*
druPromptForDevice
Interactively asks the user to select a device from the devices which are
currently attached. If only one device is connected, the device is
automatically chosen and nothing is printed.
The optional filter function is called to filter devices. If you wish to
suppress a device, the filter function should return 0.
The returned device is retained by this routine.
*/
DRDeviceRef
druPromptForDevice(char *promptString, druDeviceFilterProc filter)
{
CFArrayRef deviceList = DRCopyDeviceArray();
CFIndex deviceCount = CFArrayGetCount(deviceList);
DRDeviceRef device;
CFIndex selection;
char userInput[10];
/* Can't proceed without at least one drive. */
if (deviceCount == 0)
{
printf("Sorry, no CD/DVD drives were found.\n");
exit(1);
}
/* Filter the list. */
if (filter != NULL)
{
CFMutableArrayRef filteredList = CFArrayCreateMutableCopy(NULL,0,deviceList);
for (selection=deviceCount-1; selection>=0; --selection)
if ((*filter)((DRDeviceRef)CFArrayGetValueAtIndex(filteredList,selection)) == 0)
CFArrayRemoveValueAtIndex(filteredList,selection);
CFRelease(deviceList);
deviceList = filteredList;
deviceCount = CFArrayGetCount(deviceList);
}
/* Can't proceed without at least one drive. */
if (deviceCount == 0)
{
printf("Sorry, no eligible drives were found.\n");
exit(1);
}
/* If there's only one device, which is actually true for many machines (those with
an internal CD burner and no external burners attached) then the choice
is obvious, and we don't need to display a menu. */
if (deviceCount == 1)
{
device = (DRDeviceRef)CFArrayGetValueAtIndex(deviceList,0);
CFRetain(device);
CFRelease(deviceList);
return device;
}
/* Display a menu of devices. */
printf("Available devices:\n");
druDisplayDeviceList(deviceList);
/* Display the prompt. */
if (promptString == NULL)
promptString = "Please select a device:";
printf("%s ", promptString);
fflush(stdout);
/* Get user input. */
userInput[0] = 0;
selection = atoi(fgets(userInput,sizeof(userInput),stdin)) - 1;
if (selection < 0 || selection >= deviceCount)
{
printf("Aborted.\n");
exit(1);
}
/* Return the selected device. */
device = (DRDeviceRef)CFArrayGetValueAtIndex(deviceList,selection);
CFRetain(device);
CFRelease(deviceList);
return device;
}
/*
druPromptForBlankMediaInDevice
Interactively prompts for blank, writable media in a particular device. The type of
media is not considered, so this is probably most useful for pure data discs. In other
situations, the type of media may be important - for example, DVD media is not valid if
you're writing an audio CD.
When the call completes, there is blank media in the drive and we will, if possible,
have a reservation on the media (so nobody else can burn to it or grab it out from
underneath us).
*/
void
druPromptForBlankMediaInDevice(DRDeviceRef device)
{
DRNotificationCenterRef notificationCenter = NULL;
CFRunLoopSourceRef source = NULL;
/* If the device contains blank media right now, then we're done. */
if (druDeviceContainsBlankMedia(device))
return;
/* Display a prompt. */
printf("Please insert blank media.\n");
/* Open the tray (and eject existing media, if any). */
/* This call may or may not work - the media in the device may be busy
and can't be unmounted, or the device may not even have a tray (slot-load
drives are an example of this). However, we don't really care; this is just
a convenience to the user and will do the right thing if the right thing
can be done. */
/* We also don't want to eject the media if it's still spinning up -
the user may have just inserted it, and it takes a good 5-10 seconds
on some drives for discs to be recognized. */
if (!druDeviceIsBecomingReady(device))
DRDeviceEjectMedia(device);
/* Sign up for device status notifications, and enter a tiny runloop so that we can avoid polling. */
notificationCenter = DRNotificationCenterCreate();
source = DRNotificationCenterCreateRunLoopSource(notificationCenter);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes);
DRNotificationCenterAddObserver(notificationCenter, NULL, druWaitForBlankMedia, NULL, device);
CFRunLoopRun();
CFRunLoopSourceInvalidate(source);
/* Clean up memory and we're done. */
if (notificationCenter != NULL) CFRelease(notificationCenter);
if (source != NULL) CFRelease(source);
}
/*
druPromptForErasableMediaInDevice
Interactively prompts for erasable media in a particular device. The type of media
is not considered.
When the call completes, there is erasable media in the drive and we have a reservation
on the media (so nobody else can burn to it or grab it out from underneath us).
*/
void
druPromptForErasableMediaInDevice(DRDeviceRef device)
{
DRNotificationCenterRef notificationCenter = NULL;
CFRunLoopSourceRef source = NULL;
/* If the device contains erasable media right now, then we're done. */
if (druDeviceContainsErasableMedia(device))
return;
/* Display a prompt. */
printf("Please insert erasable media.\n");
/* Open the tray (and eject existing media, if any). */
/* This call may or may not work - the media in the device may be busy
and can't be unmounted, or the device may not even have a tray (slot-load
drives are an example of this). However, we don't really care; this is just
a convenience to the user and will do the right thing if the right thing
can be done. */
/* We also don't want to eject the media if it's still spinning up -
the user may have just inserted it, and it takes a good 5-10 seconds
on some drives for discs to be recognized. */
if (!druDeviceIsBecomingReady(device))
DRDeviceEjectMedia(device);
/* Sign up for device status notifications, and enter a tiny runloop so that we can avoid polling. */
notificationCenter = DRNotificationCenterCreate();
source = DRNotificationCenterCreateRunLoopSource(notificationCenter);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes);
DRNotificationCenterAddObserver(notificationCenter, NULL, druWaitForErasableMedia, NULL, device);
CFRunLoopRun();
CFRunLoopSourceInvalidate(source);
/* Clean up memory and we're done. */
if (notificationCenter != NULL) CFRelease(notificationCenter);
if (source != NULL) CFRelease(source);
}
/*
druDeviceContainsBlankMedia
Returns TRUE if the device contains blank media.
*/
int
druDeviceContainsBlankMedia(DRDeviceRef device)
{
CFDictionaryRef deviceStatus = DRDeviceCopyStatus(device);
CFStringRef mediaState = CFDictionaryGetValue(deviceStatus,kDRDeviceMediaStateKey);
int result = 0;
/* Check to see if there's media in the device */
if (mediaState != NULL && CFEqual(mediaState,kDRDeviceMediaStateMediaPresent))
{
CFDictionaryRef mediaInfo = CFDictionaryGetValue(deviceStatus,kDRDeviceMediaInfoKey);
CFBooleanRef blank = CFDictionaryGetValue(mediaInfo,kDRDeviceMediaIsBlankKey);
CFBooleanRef appendable = CFDictionaryGetValue(mediaInfo,kDRDeviceMediaIsAppendableKey);
/* There's media, but is it blank and writable? */
if (blank != NULL && CFBooleanGetValue(blank) && appendable != NULL && CFBooleanGetValue(appendable))
result = 1;
}
CFRelease(deviceStatus);
return result;
}
/*
druDeviceContainsErasableMedia
Returns TRUE if the device contains blank media.
*/
int
druDeviceContainsErasableMedia(DRDeviceRef device)
{
CFDictionaryRef deviceStatus = DRDeviceCopyStatus(device);
CFStringRef mediaState = CFDictionaryGetValue(deviceStatus,kDRDeviceMediaStateKey);
int result = 0;
/* Check to see if there's media in the device */
if (mediaState != NULL && CFEqual(mediaState,kDRDeviceMediaStateMediaPresent))
{
CFDictionaryRef mediaInfo = CFDictionaryGetValue(deviceStatus,kDRDeviceMediaInfoKey);
CFBooleanRef erasable = CFDictionaryGetValue(mediaInfo,kDRDeviceMediaIsErasableKey);
/* There's media, but is it blank and writable? */
if (erasable != NULL && CFBooleanGetValue(erasable))
result = 1;
}
CFRelease(deviceStatus);
return result;
}
/*
druDeviceIsBecomingReady
Returns TRUE if the device is becoming ready (eg, spinning up).
*/
int
druDeviceIsBecomingReady(DRDeviceRef device)
{
CFDictionaryRef deviceStatus = DRDeviceCopyStatus(device);
CFStringRef mediaState = CFDictionaryGetValue(deviceStatus,kDRDeviceMediaStateKey);
int result;
result = (mediaState != NULL && CFEqual(mediaState,kDRDeviceMediaStateInTransition)) ? 1:0;
CFRelease(deviceStatus);
return result;
}
/*
druDisplayDeviceList
Displays a list of devices, prefixed by their numeric index in the array.
*/
void
druDisplayDeviceList(CFArrayRef deviceArray)
{
CFIndex i, deviceCount = CFArrayGetCount(deviceArray);
for (i=0;i<deviceCount;++i)
{
DRDeviceRef thisDevice = (DRDeviceRef)CFArrayGetValueAtIndex(deviceArray,i);
char description[100];
printf("%2d) %s\n", (int)(i+1), druGetDeviceDescription(thisDevice,description,sizeof(description)));
}
}
/*
druGetDeviceDescription
Fills a character buffer with a device's normal description: VENDOR PRODUCT via BUS.
The incoming buffer is returned as a convenience.
*/
char *
druGetDeviceDescription(DRDeviceRef device, char *buffer, size_t bufSize)
{
CFDictionaryRef deviceInfo = DRDeviceCopyInfo(device);
CFStringRef bus = CFDictionaryGetValue(deviceInfo,kDRDevicePhysicalInterconnectKey);
CFStringRef desc;
CFIndex len = 0;
#if 1 /* for now, until the bus starts getting returned in ASCII */
if (CFEqual(bus,kDRDevicePhysicalInterconnectFireWire)) bus = CFSTR("FireWire");
else if (CFEqual(bus,kDRDevicePhysicalInterconnectUSB)) bus = CFSTR("USB");
else if (CFEqual(bus,kDRDevicePhysicalInterconnectATAPI)) bus = CFSTR("ATAPI");
else if (CFEqual(bus,kDRDevicePhysicalInterconnectSCSI)) bus = CFSTR("SCSI");
else bus = CFSTR("unknown interface");
#endif
desc = CFStringCreateWithFormat(NULL,NULL,CFSTR("%@ %@ via %@"),
CFDictionaryGetValue(deviceInfo,kDRDeviceVendorNameKey),
CFDictionaryGetValue(deviceInfo,kDRDeviceProductNameKey),
bus);
CFStringGetBytes(desc, CFRangeMake(0,CFStringGetLength(desc)), kCFStringEncodingASCII,
'.', false, (UInt8*)buffer, bufSize-1, &len);
buffer[len] = 0;
CFRelease(deviceInfo);
CFRelease(desc);
return buffer;
}
/*
druGetDeviceShortDescription
Fills a character buffer with a device's short description: VENDOR PRODUCT.
The incoming buffer is returned as a convenience.
*/
char *
druGetDeviceShortDescription(DRDeviceRef device, char *buffer, size_t bufSize)
{
CFDictionaryRef deviceInfo = DRDeviceCopyInfo(device);
CFStringRef desc = CFStringCreateWithFormat(NULL,NULL,CFSTR("%@ %@"),
CFDictionaryGetValue(deviceInfo,kDRDeviceVendorNameKey),
CFDictionaryGetValue(deviceInfo,kDRDeviceProductNameKey));
CFIndex len = 0;
CFStringGetBytes(desc, CFRangeMake(0,CFStringGetLength(desc)), kCFStringEncodingASCII,
'.', false, (UInt8*)buffer, bufSize-1, &len);
buffer[len] = 0;
CFRelease(deviceInfo);
CFRelease(desc);
return buffer;
}
/*
dru_getlongdevicedescription
Fills a character buffer with a device's long description: VENDOR PRODUCT (FIRMWARE) via BUS.
The incoming buffer is returned as a convenience.
*/
char *
druGetDeviceLongDescription(DRDeviceRef device, char *buffer, size_t bufSize)
{
CFDictionaryRef deviceInfo = DRDeviceCopyInfo(device);
CFStringRef bus = CFDictionaryGetValue(deviceInfo,kDRDevicePhysicalInterconnectKey);
CFStringRef desc;
CFIndex len = 0;
#if 1 /* for now, until the bus starts getting returned in ASCII */
if (CFEqual(bus,kDRDevicePhysicalInterconnectFireWire)) bus = CFSTR("FireWire");
else if (CFEqual(bus,kDRDevicePhysicalInterconnectUSB)) bus = CFSTR("USB");
else if (CFEqual(bus,kDRDevicePhysicalInterconnectATAPI)) bus = CFSTR("ATAPI");
else if (CFEqual(bus,kDRDevicePhysicalInterconnectSCSI)) bus = CFSTR("SCSI");
else bus = CFSTR("unknown interface");
#endif
desc = CFStringCreateWithFormat(NULL,NULL,CFSTR("%@ %@ (%@) via %@"),
CFDictionaryGetValue(deviceInfo,kDRDeviceVendorNameKey),
CFDictionaryGetValue(deviceInfo,kDRDeviceProductNameKey),
CFDictionaryGetValue(deviceInfo,kDRDeviceFirmwareRevisionKey),
bus);
CFStringGetBytes(desc, CFRangeMake(0,CFStringGetLength(desc)), kCFStringEncodingASCII,
'.', false, (UInt8*)buffer, bufSize-1, &len);
buffer[len] = 0;
CFRelease(deviceInfo);
CFRelease(desc);
return buffer;
}
#pragma mark -
/*
druMediaIsReserved
Returns TRUE if the device contains blank media.
*/
int
druMediaIsReserved(DRDeviceRef device)
{
CFDictionaryRef deviceStatus = DRDeviceCopyStatus(device);
CFStringRef mediaState = CFDictionaryGetValue(deviceStatus,kDRDeviceMediaStateKey);
int result = 0;
/* Check to see if there's media in the device */
if (mediaState != NULL && CFEqual(mediaState,kDRDeviceMediaStateMediaPresent))
{
CFDictionaryRef mediaInfo = CFDictionaryGetValue(deviceStatus,kDRDeviceMediaInfoKey);
CFBooleanRef reserved = CFDictionaryGetValue(mediaInfo,kDRDeviceMediaIsReservedKey);
/* There's media, but do we have the reservation? */
if (reserved != NULL && CFBooleanGetValue(reserved))
result = 1;
}
CFRelease(deviceStatus);
return result;
}
/*
druWaitForBlankMedia
DRNotificationCallback to wait for blank media.
*/
void
druWaitForBlankMedia(DRNotificationCenterRef center,void *observer,CFStringRef name,DRTypeRef object,CFDictionaryRef info)
{
#pragma unused(center, info, observer)
DRDeviceRef device = (DRDeviceRef)object;
/* The device may have been unplugged - check for that. */
if (CFEqual(name,kDRDeviceDisappearedNotification) || !DRDeviceIsValid(device))
{
printf("Aborted. (device disconnected)\n");
exit(1);
}
/* If the device status changed, and there's blank media now.... */
if (CFEqual(name,kDRDeviceStatusChangedNotification) && druDeviceContainsBlankMedia(device))
{
/* Then stop the runloop. */
CFRunLoopStop(CFRunLoopGetCurrent());
}
}
/*
druWaitForErasableMedia
DRNotificationCallback to wait for blank media.
*/
void
druWaitForErasableMedia(DRNotificationCenterRef center,void *observer,CFStringRef name,DRTypeRef object,CFDictionaryRef info)
{
#pragma unused(center, info, observer)
DRDeviceRef device = (DRDeviceRef)object;
/* The device may have been unplugged - check for that. */
if (CFEqual(name,kDRDeviceDisappearedNotification) || !DRDeviceIsValid(device))
{
printf("Aborted. (device disconnected)\n");
exit(1);
}
/* If the device status changed, and there's blank media now.... */
if (CFEqual(name,kDRDeviceStatusChangedNotification) && druDeviceContainsErasableMedia(device))
{
/* Then stop the runloop. */
CFRunLoopStop(CFRunLoopGetCurrent());
}
}
int
druFilter_AnyBurner(DRDeviceRef device)
{
CFDictionaryRef info = DRDeviceCopyInfo(device);
CFDictionaryRef capabilities = CFDictionaryGetValue(info,kDRDeviceWriteCapabilitiesKey);
int result = ((CFDictionaryGetValue(capabilities,kDRDeviceCanWriteCDRKey) == kCFBooleanTrue) ||
(CFDictionaryGetValue(capabilities,kDRDeviceCanWriteCDRWKey) == kCFBooleanTrue) ||
(CFDictionaryGetValue(capabilities,kDRDeviceCanWriteDVDRKey) == kCFBooleanTrue) ||
(CFDictionaryGetValue(capabilities,kDRDeviceCanWriteDVDRWKey) == kCFBooleanTrue));
CFRelease(info);
return result;
}
int
druFilter_AnyEraser(DRDeviceRef device)
{
CFDictionaryRef info = DRDeviceCopyInfo(device);
CFDictionaryRef capabilities = CFDictionaryGetValue(info,kDRDeviceWriteCapabilitiesKey);
int result = ((CFDictionaryGetValue(capabilities,kDRDeviceCanWriteCDRWKey) == kCFBooleanTrue) ||
(CFDictionaryGetValue(capabilities,kDRDeviceCanWriteDVDRWKey) == kCFBooleanTrue));
CFRelease(info);
return result;
}
int
druFilter_CDBurners(DRDeviceRef device)
{
CFDictionaryRef info = DRDeviceCopyInfo(device);
CFDictionaryRef capabilities = CFDictionaryGetValue(info,kDRDeviceWriteCapabilitiesKey);
int result = ((CFDictionaryGetValue(capabilities,kDRDeviceCanWriteCDRKey) == kCFBooleanTrue) ||
(CFDictionaryGetValue(capabilities,kDRDeviceCanWriteCDRWKey) == kCFBooleanTrue));
CFRelease(info);
return result;
}
int
druFilter_DVDBurners(DRDeviceRef device)
{
CFDictionaryRef info = DRDeviceCopyInfo(device);
CFDictionaryRef capabilities = CFDictionaryGetValue(info,kDRDeviceWriteCapabilitiesKey);
int result = ((CFDictionaryGetValue(capabilities,kDRDeviceCanWriteDVDRKey) == kCFBooleanTrue) ||
(CFDictionaryGetValue(capabilities,kDRDeviceCanWriteDVDRWKey) == kCFBooleanTrue));
CFRelease(info);
return result;
}
</pre>
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