[PATCH] Optical disc tracks

[Owen Fraser-Green]

Hi,

Attached is a patch to detect CD/DVD tracks and add them as devices
underneath the disc device. This seemed like a logical step given that a
disk devices have their volumes as children.

It's useful since it provides track position (useful for calculating
CDDB/Musicbrainz IDs and the like) and track length (useful for CD
players).

What I felt a little shaky on though was what to give for
info.capabilities (currently "track"), info.category (currently "track")
and info.product (currently "Track", well, OK that one seems obvious
enough at least).

Here's the relevant output from lshal for three of the tracks (one
leadout, one data and one audio) on the CD currently in my drive:

udi = '/org/freedesktop/Hal/devices/block_22_0-disc/170'
  track.is_leadout = true  (bool)
  track.is_audio = false  (bool)
  track.is_data = false  (bool)
  track.is_xa = false  (bool)
  track.is_cdi = false  (bool)
  track.address_lsn = 258091  (0x3f02b)  (int)
  track.address_lba = 257941  (0x3ef95)  (int)
  track.number = 170  (0xaa)  (int)
  info.capabilities = 'track'  (string)
  info.udi = '/org/freedesktop/Hal/devices/block_22_0-disc/170' 
(string)
  storage.hotpluggable = false  (bool)
  storage.cdrom.write_speed = 0  (0x0)  (int)
  storage.cdrom.read_speed = 4234  (0x108a)  (int)
  storage.cdrom.support_media_changed = true  (bool)
  storage.cdrom.eject_check_enabled = true  (bool)
  storage.cdrom.dvdplusrw = false  (bool)
  storage.cdrom.dvdplusr = false  (bool)
  storage.cdrom.dvdram = false  (bool)
  storage.cdrom.dvdr = false  (bool)
  storage.cdrom.dvd = false  (bool)
  storage.cdrom.cdrw = false  (bool)
  storage.cdrom.cdr = false  (bool)
  storage.removable = true  (bool)
  storage.drive_type = 'cdrom'  (string)
  info.product = 'Track'  (string)
  block.storage_device = '/org/freedesktop/Hal/devices/block_22_0' 
(string)
  storage.physical_device = '/org/freedesktop/Hal/devices/ide_1_0' 
(string)
  storage.vendor = ''  (string)
  storage.model = 'SAMSUNG CD-ROM SN-124'  (string)
  storage.automount_enabled = true  (bool)
  storage.media_check_enabled = true  (bool)
  storage.bus = 'ide'  (string)
  block.minor = 0  (0x0)  (int)
  block.major = 22  (0x16)  (int)
  info.category = 'track'  (string)
  info.parent = '/org/freedesktop/Hal/devices/block_22_0-disc'  (string)
  block.device = '/udev/hdc'  (string)
  block.is_volume = true  (bool)
  linux.sysfs_path_device = '/sys/block/hdc'  (string)
  linux.sysfs_path = '/sys/block/hdc'  (string)
  info.bus = 'block'  (string)
  volume.label = ''  (string)
  volume.uuid = ''  (string)
  volume.fstype = ''  (string)
  volume.mount_point = ''  (string)
  volume.is_mounted = false  (bool)
  volume.is_disc = true  (bool)
  volume.disc.type = 'unknown'  (string)
  volume.disc.has_audio = true  (bool)
  volume.disc.has_data = true  (bool)
  volume.disc.is_blank = false  (bool)
  volume.disc.is_appendable = false  (bool)
  volume.disc.is_rewritable = false  (bool)

udi = '/org/freedesktop/Hal/devices/block_22_0-disc/13'
  track.length_frames = 66554  (0x103fa)  (int)
  track.is_leadout = false  (bool)
  track.is_audio = false  (bool)
  track.is_data = true  (bool)
  track.is_xa = false  (bool)
  track.is_cdi = false  (bool)
  track.address_lsn = 191537  (0x2ec31)  (int)
  track.address_lba = 191387  (0x2eb9b)  (int)
  track.number = 13  (0xd)  (int)
  info.capabilities = 'track'  (string)
  info.udi = '/org/freedesktop/Hal/devices/block_22_0-disc/13'  (string)
  storage.hotpluggable = false  (bool)
  storage.cdrom.write_speed = 0  (0x0)  (int)
  storage.cdrom.read_speed = 4234  (0x108a)  (int)
  storage.cdrom.support_media_changed = true  (bool)
  storage.cdrom.eject_check_enabled = true  (bool)
  storage.cdrom.dvdplusrw = false  (bool)
  storage.cdrom.dvdplusr = false  (bool)
  storage.cdrom.dvdram = false  (bool)
  storage.cdrom.dvdr = false  (bool)
  storage.cdrom.dvd = false  (bool)
  storage.cdrom.cdrw = false  (bool)
  storage.cdrom.cdr = false  (bool)
  storage.removable = true  (bool)
  storage.drive_type = 'cdrom'  (string)
  info.product = 'Track'  (string)
  block.storage_device = '/org/freedesktop/Hal/devices/block_22_0' 
(string)
  storage.physical_device = '/org/freedesktop/Hal/devices/ide_1_0' 
(string)
  storage.vendor = ''  (string)
  storage.model = 'SAMSUNG CD-ROM SN-124'  (string)
  storage.automount_enabled = true  (bool)
  storage.media_check_enabled = true  (bool)
  storage.bus = 'ide'  (string)
  block.minor = 0  (0x0)  (int)
  block.major = 22  (0x16)  (int)
  info.category = 'track'  (string)
  info.parent = '/org/freedesktop/Hal/devices/block_22_0-disc'  (string)
  block.device = '/udev/hdc'  (string)
  block.is_volume = true  (bool)
  linux.sysfs_path_device = '/sys/block/hdc'  (string)
  linux.sysfs_path = '/sys/block/hdc'  (string)
  info.bus = 'block'  (string)
  volume.label = ''  (string)
  volume.uuid = ''  (string)
  volume.fstype = ''  (string)
  volume.mount_point = ''  (string)
  volume.is_mounted = false  (bool)
  volume.is_disc = true  (bool)
  volume.disc.type = 'unknown'  (string)
  volume.disc.has_audio = true  (bool)
  volume.disc.has_data = true  (bool)
  volume.disc.is_blank = false  (bool)
  volume.disc.is_appendable = false  (bool)
  volume.disc.is_rewritable = false  (bool)

udi = '/org/freedesktop/Hal/devices/block_22_0-disc/12'
  track.length_msn = '5:17:70'  (string)
  track.length_frames = 23845  (0x5d25)  (int)
  track.is_leadout = false  (bool)
  track.is_audio = true  (bool)
  track.is_data = false  (bool)
  track.is_xa = false  (bool)
  track.is_cdi = false  (bool)
  track.address_lsn = 167692  (0x28f0c)  (int)
  track.address_lba = 167542  (0x28e76)  (int)
  track.number = 12  (0xc)  (int)
  info.capabilities = 'track'  (string)
  info.udi = '/org/freedesktop/Hal/devices/block_22_0-disc/12'  (string)
  storage.hotpluggable = false  (bool)
  storage.cdrom.write_speed = 0  (0x0)  (int)
  storage.cdrom.read_speed = 4234  (0x108a)  (int)
  storage.cdrom.support_media_changed = true  (bool)
  storage.cdrom.eject_check_enabled = true  (bool)
  storage.cdrom.dvdplusrw = false  (bool)
  storage.cdrom.dvdplusr = false  (bool)
  storage.cdrom.dvdram = false  (bool)
  storage.cdrom.dvdr = false  (bool)
  storage.cdrom.dvd = false  (bool)
  storage.cdrom.cdrw = false  (bool)
  storage.cdrom.cdr = false  (bool)
  storage.removable = true  (bool)
  storage.drive_type = 'cdrom'  (string)
  info.product = 'Track'  (string)
  block.storage_device = '/org/freedesktop/Hal/devices/block_22_0' 
(string)
  storage.physical_device = '/org/freedesktop/Hal/devices/ide_1_0' 
(string)
  storage.vendor = ''  (string)
  storage.model = 'SAMSUNG CD-ROM SN-124'  (string)
  storage.automount_enabled = true  (bool)
  storage.media_check_enabled = true  (bool)
  storage.bus = 'ide'  (string)
  block.minor = 0  (0x0)  (int)
  block.major = 22  (0x16)  (int)
  info.category = 'track'  (string)
  info.parent = '/org/freedesktop/Hal/devices/block_22_0-disc'  (string)
  block.device = '/udev/hdc'  (string)
  block.is_volume = true  (bool)
  linux.sysfs_path_device = '/sys/block/hdc'  (string)
  linux.sysfs_path = '/sys/block/hdc'  (string)
  info.bus = 'block'  (string)
  volume.label = ''  (string)
  volume.uuid = ''  (string)
  volume.fstype = ''  (string)
  volume.mount_point = ''  (string)
  volume.is_mounted = false  (bool)
  volume.is_disc = true  (bool)
  volume.disc.type = 'unknown'  (string)
  volume.disc.has_audio = true  (bool)
  volume.disc.has_data = true  (bool)
  volume.disc.is_blank = false  (bool)
  volume.disc.is_appendable = false  (bool)
  volume.disc.is_rewritable = false  (bool)


Cheers,
Owen

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