home *** CD-ROM | disk | FTP | other *** search
-
-
-
- - 1 -
-
-
-
- 7. _D_A_T__A_u_d_i_o__S_u_p_p_o_r_t
-
- This section describes changes, bug fixes, known problems,
- and known documentation errors relating to the audio
- capabilities of the SCSI DDS drive for IRIX workstations.
-
- Starting with IRIX 6.3, subsystem _d_m_e_d_i_a__e_o_e._s_w._t_o_o_l_s
- includes a new DAT playback/capture program called
- ddddaaaattttppppllllaaaayyyyeeeerrrr. DDDDaaaattttppppllllaaaayyyyeeeerrrr provides a transport control panel
- interface to the audio capabilities of a DAT tape drive
- include a track scanning mechanism and convenient audio
- capture utilities. It also provides a facility for building
- a database of the contents of a tape, so that the tape's
- tracks may be listed by name.
-
- DDDDaaaattttppppllllaaaayyyyeeeerrrr does not have any recording capabilities. Users
- can master DAT tapes by using the EEEExxxxppppoooorrrrtttt file menu option in
- SSSSoooouuuunnnnddddTTTTrrrraaaacccckkkk.
-
- DDDDaaaattttppppllllaaaayyyyeeeerrrr does not replace the application ddddaaaattttmmmmaaaannnn since
- ddddaaaattttmmmmaaaannnn is currently the only way to "spot record" onto DAT
- tapes.
-
- _P_L_E_A_S_E _N_O_T_E that as of 6.5, DAT audio is no longer
- officially supported.
-
- 7.1 _C_h_a_n_g_e_s__a_n_d__A_d_d_i_t_i_o_n_s
-
- +o We have added support for DDS3 drives from Sony. These
- drives have excellent audio capabilities without the
- firmware problems exhibited in older drives.
-
-
- 7.2 _K_n_o_w_n__P_r_o_b_l_e_m_s__a_n_d__W_o_r_k_a_r_o_u_n_d_s
-
-
- There are a number of firmware problems with the older DDS2
- drives. They are also very sensitive to tape residue. We
- strongly recommend frequent cleaning and the use of new tape
- when possible (particularly for mastering).
-
- +o Please note that datplayer does not work reliably with
- the DDS2 drives.
-
- +o DAT audio firmware problem: data tape at BOT.
-
- Assume a DDS (data) tape (ie, a tape previously
- recorded in data mode) is inserted in the DAT drive.
- The drive will rewind the tape to logical BOT, which on
- a data tape is different than physical BOT. If you
- attempt to write audio data to the drive, it begins
-
-
-
-
-
-
-
-
-
-
-
- - 2 -
-
-
-
- writing at logical BOT. When the tape is later re-
- inserted into the drive, it is incorrectly recognized
- as a data tape since DDS format data exists between
- physical BOT and logical BOT.
-
- Workaround: Check to see if the tape in the drive is
- DDS media and at BOT. If so, in audio mode write a
- frame of data to move the tape off logical BOT, then
- issue a rewind. This will cause the tape to rewind
- back to physical BOT.
-
- +o DAT audio firmware problem: read position bug.
-
- The DAT drive firmware incorrectly returns its position
- via the MTGETAUDIO ioctl to the IRIX tape driver. There
- are two modes to this behavior.
-
- +o Immediately following a seek: Suppose you seek by
- A-time (absolute time). Then MTGETAUDIO returns
- the correct A-time, but incorrect P-time (program
- time). Suppose you seek by P-time. Then MTGETAUDIO
- returns the correct P-time, but incorrect A-time.
-
- +o Following a read or write: Both A-time and P-time
- are wrong.
-
- Workaround: Read a frame from the tape and decode the
- subcode information. This of course moves the tape, so
- you may have to seek back to the previous location or
- otherwise account for the resulting 1 frame difference
- between the frame read and the new tape position.
-
- +o DAT audio firmware problem: read delay bug.
-
- If not used for 60 seconds, the DAT drive unloads the
- tape from the heads. Once this happens, subsequent
- reads will fail.
-
- Workaround: Avoid 60 second delays between subsequent
- operations.
-
- +o Write following read: A write following a read is not
- frame-accurate. It may go onto the tape several frames
- too early, overwriting some of the data just read.
-
- Workaround: None (because of the following bug).
-
- +o DAT audio firmware problem: Write following seek.
-
- A write following a seek is not frame-accurate. About
- 50% of the time, a write following a seek will go onto
-
-
-
-
-
-
-
-
-
-
-
- - 3 -
-
-
-
- the tape a few frames early.
-
- Workaround: None.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-