Re: [Libcdio-devel] Re: Submission of new mmc function for libcdio

[Rocky Bernstein]

Thanks - this is good.

Are the states:

   1. writing from scratch (blank)
   2. overwritable (but not necessarily blank)
   3. erased (and now blank) but not known new media

distinguishable using MMC, even though libburn doesn't need to separate
these?
If so, or if there are* other* clearly distinct states of information which
are combined in that enumeration, I think it would be to separate them.
Having done this, it is still possible to write an "is_blank()" routine
which tests for some set of enumeration values.

Also, although I can see why libburn may find it useful to combine drive and
media status here, I'm not sure it would be advisable from the standpoint of
a developing general library.

On Sun, Jan 31, 2010 at 10:59 AM, Thomas Schmitt <address@hidden> wrote:

> ...
> libburn has:
>
> /** Possible status of the drive in regard to the disc in it. */
> enum burn_disc_status
> {
>        /** The current status is not yet known */
>        BURN_DISC_UNREADY,
>
>        /** The drive holds a blank disc. It is ready for writing from
> scratch.
>            Unused multi-session media:
>              CD-R, CD-RW, DVD-R, DVD-RW, DVD+R, BD-R
>            Blanked multi-session media (i.e. treated by burn_disc_erase())
>              CD-RW, DVD-RW
>            Overwriteable media with or without valid data
>              DVD-RAM, DVD+RW, formatted DVD-RW, BD-RE
>        */
>        BURN_DISC_BLANK,
>
>        /** There is no disc at all in the drive */
>        BURN_DISC_EMPTY,
>
>        /** There is an incomplete disc in the drive. It is ready for
> appending
>            another session.
>            Written but not yet closed multi-session media
>              CD-R, CD-RW, DVD-R, DVD-RW, DVD+R, BD-R
>        */
>        BURN_DISC_APPENDABLE,
>
>        /** There is a disc with data on it in the drive. It is usable only
> for
>            reading.
>            Written and closed multi-session media
>              CD-R, CD-RW, DVD-R, DVD-RW, DVD+R, BD-R
>            Read-Only media
>              CD-ROM, DVD-ROM, BD-ROM
>            Note that many DVD-ROM drives report any written media
>            as Read-Only media and not by their real media types.
>        */
>        BURN_DISC_FULL,
>
>        /* @since 0.2.4 */
>        /** The drive was not grabbed when the status was inquired */
>        BURN_DISC_UNGRABBED,
>
>        /* @since 0.2.6 */
>        /** The media seems to be unsuitable for reading and for writing */
>        BURN_DISC_UNSUITABLE
> };
>
> BURN_DISC_UNGRABBED is a libburn term, not
> related to a media state. Actually drive and
> media are seen as one single entity here.
> ...
>
>