Yes, I think libcdio should have a mmc_get_discmode, so additions are most welcome here.
I had thought recent work that Thomas added here covered this, but I don't see it. Perhaps I was thinking about information he recently added to the libcdio glossary under "Media models and profiles" which may be of some help? On Wed, Jan 27, 2010 at 1:10 PM, Frank Endres <[email protected]>wrote: > Hi ! > > I use libcdio for only a short time, and found it easy to use (good > examples > and documentation), except for mmc commands. Now, after long searches, I > have understood how it works, and I have a suggestion: > add a link to "http://www.13thmonkey.org/documentation/SCSI/mmc-r10a.pdf,"; > on your doc (mmc.h - if not already done, maybe I haven't looked in the > right place). > > I want to use libcdio as an alternate method for device and media detection > in my SimpleBurn project (http://simpleburn.tuxfamily.org - wait untill > next > version to have that libcdio detection feature). I wanted a function to > tell > me if a CD is rewritable or not, and didn't find it, so I wrote one (I have > seen no other solution than using a mmc command); if you find it usefull, > you can add it into libcdio: > > /*! > Detects if a disc (CD or DVD) is erasable or not. > See http://www.13thmonkey.org/documentation/SCSI/mmc-r10a.pdf, tables > 129-134. > @return true if the disc is erasable (rewritable), false otherwise. > */ > bool > mmc_get_disc_erasable ( const CdIo_t *p_cdio) { > mmc_cdb_t cdb = {{0, }}; > > uint8_t buf[42] = { 0, }; > > CDIO_MMC_SET_COMMAND (cdb.field, CDIO_MMC_GPCMD_READ_DISC_INFO); > CDIO_MMC_SET_READ_LENGTH8 (cdb.field, sizeof(buf)); > > mmc_run_cmd (p_cdio, 0, &cdb, SCSI_MMC_DATA_READ, sizeof(buf), &buf); > > if (buf[2] & 0x10) //works even if the 'mmc_run_cmd' command fails > return true; > else > return false; > } > > If I have understood the source, even cdw doesn't use libcdio to detect a > device type (it uses dvd+rw-tools or cdrtools output I guess). It could be > interesting to add a feature to get more information on discs: (add some > values to (mmc)discmode_t enumeration for example: CDIO_DISC_MODE_CD_R, > CDIO_DISC_MODE_CD_RW, CDIO_DISC_MODE_CD_ROM), and a new function like: > "mmcdiscmode_t mmc_get_discmode (CdIo *p_cdio)". Tell me if you are > interested in this feature. > > Best regards ! > > Frank Endres >
