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<TITLE>Int 21/AX=4402h
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<META NAME="Description" CONTENT="
Int 21/AX=4402h - CD-ROM device driver - IOCTL INPUT -
AX = 4402h
BX = file handle referencing character device for CD-ROM driver
CX = number of bytes to read
DS:DX - control block (see #01449)
Return: CF clear if successful
AX = number of bytes actually read
CF set on error
AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)
Notes: the data returned depends on the first byte of the control block
(two bytes for functions 01h/07h/0Bh, see #01449); the remainder of
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<h2>Int 21/AX=4402h
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<h3><font color=#C00040>CD-ROM device driver - IOCTL INPUT</font></h3>
<PRE>
AX = 4402h
BX = file handle referencing character device for CD-ROM driver
CX = number of bytes to read
DS:DX -> control block <a href="rb-2829.htm#Table1449" tppabs="http://www.ctyme.com/intr/rb-2829.htm#Table1449">(see #01449)</a><br>
<p><b>Return:</b><br>CF clear if successful
AX = number of bytes actually read
CF set on error
AX = error code (01h,05h,06h,0Dh) <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
</PRE>
<p><b>Notes:</b>
The data returned depends on the first byte of the control block
(two bytes for functions 01h/07h/0Bh, see #01449); the remainder of
the control block is filled by the driver.
Some device drivers support several subunits (that is more than one
drive) but it is not possible to distinguish between them with this
function; use INT 2F/AX=1510h or INT 2F/AX=0802h instead.
Under Windows95, the "mscd$$$$" device cannot be opened so you cannot
<PRE>
<p><b>obtain the handle required by this function:</b><br>Use INT 2F/AX=1510h
or INT 2F/AX=0802h instead
</PRE>
<p><b>See Also:</b>
<a href="rb-2856.htm" tppabs="http://www.ctyme.com/intr/rb-2856.htm">AX=4403h"CD-ROM"</a> - <a href="rb-4282.htm" tppabs="http://www.ctyme.com/intr/rb-4282.htm">INT 2F/AX=0802h</a> - <a href="rb-4493.htm" tppabs="http://www.ctyme.com/intr/rb-4493.htm">INT 2F/AX=1510h</a>
<PRE>
<p>
<a name=table1448></a>
(Table 01448)
Values for CD-ROM data being requested:
00h device driver header address
01h drive head location
02h reserved
03h error statistics
04h audio channel info
05h raw drive bytes (uninterpreted and device-specific)
06h device status
07h sector size
08h volume size
09h media change status
0Ah audio disk info
0Bh audio track info
0Ch audio Q-Channel info
0Dh audio sub-channel info
0Eh UPC code
0Fh audio status info
<p>
Format of CD-ROM control block:
<a name=table1449></a>
Offset Size Description (Table 01449)
00h BYTE data being requested <a href="rb-2829.htm#Table1448" tppabs="http://www.ctyme.com/intr/rb-2829.htm#Table1448">(see #01448)</a>
---function 00h---
01h DWORD device driver header address (see also AH=52h,#01646)
---function 01h---
01h BYTE (call) addressing mode
00h HSG
01h Red Book
02h DWORD current location of drive's head
logical sector number in HSG mode
frame/second/minute/unused in Red Book mode
(HSG sector = minute * 4500 + second * 75 + frame - 150)
---function 03h---
01h N BYTEs undefined as of 5 Aug 88 specification
---function 04h---
01h BYTE input channel (0-3) for output channel 0
02h BYTE volume for output channel 0
03h BYTE input channel (0-3) for output channel 1
04h BYTE volume for output channel 1
05h BYTE input channel (0-3) for output channel 2
06h BYTE volume for output channel 2
07h BYTE input channel (0-3) for output channel 3
08h BYTE volume for output channel 3
</PRE>
<p><b>Notes:</b>
Output channels 0 and 1 are left and right, 2 and 3 are left prime and
right prime; a volume of 00h is off.
The default setting is for each input channel to be assigned to the
same-numbered output channel at full (FFh) volume
---function 05h---
01h BYTE number of bytes read
02h 128 BYTEs buffer for drive bytes
---function 06h---
01h DWORD device parameters <a href="rb-2829.htm#Table1450" tppabs="http://www.ctyme.com/intr/rb-2829.htm#Table1450">(see #01450)</a>
---function 07h---
01h BYTE (call) read mode
00h cooked
01h raw
02h WORD (return) sector size in bytes
---function 08h---
01h DWORD volume size in sectors
<p><b>BUGS:</b>
Aztech device driver v1.10 and v1.27 (at least) return the last sector
number, i.e. total number of sectors - 1.
Windows95 returns the total number of sectors + 150 (see the Red Book
to HSG conversion formula at function 01h to understand why this
happens)
---function 09h---
01h BYTE media change status
00h don't know
01h media unchanged
FFh media has been changed
---function 0Ah---
01h BYTE lowest audio track number
02h BYTE highest audio track number
03h DWORD start address of lead-out track (Red Book format)
--function 0Bh---
01h BYTE (call) track number
02h DWORD starting point of track (Red Book format)
06h BYTE track control info
<PRE>
<p><b>bits 15,14,12:</b><br>Track type (notice: bits not contiguous!)
000 two audio channels, no pre-emphasis
001 two audio channels with pre-emphasis
010 data track
100 four audio channels, no pre-emphasis
101 four audio channels with pre-emphasis
other reserved
<p><b>bit 13:</b><br>Digital copy permitted
---function 0Ch---
01h BYTE CONTROL and ADR byte (as received from drive)
02h BYTE track number
03h BYTE point or index
04h BYTE minute \
05h BYTE second > running time within track
06h BYTE frame /
07h BYTE zero
08h BYTE "AMIN" or "PMIN" \
09h BYTE "ASEC" or "PSEC" > running time on disk
0Ah BYTE "AFRAME" or "PFRAME" /
---function 0Dh---
01h DWORD starting frame address (Red Book format)
05h DWORD transfer address
09h DWORD number of sectors to read
</PRE>
<p><b>Note:</b>
Copies 96 bytes of sub-channel info per sector into buffer
---function 0Eh---
01h BYTE CONTROL and ADR byte
02h 7 BYTEs UPC/EAN code (13 BCD digits,low-order nybble of last byte is 0)
09h BYTE zero
0Ah BYTE "AFRAME"
---function 0Fh---
??? documentation not yet available
01h WORD pause status (0000h not paused, 0001h paused)
03h DWORD audio play start address
07h DWORD ??? audio play length or end address
<PRE>
<p>
Bitfields for CD-ROM device parameters:
<a name=table1450></a>
Bit(s) Description (Table 01450)
0 door open
1 door unlocked
2 supports raw reading in addition to cooked
3 writable
4 can play audio/video tracks
5 supports interleaving
6 reserved
7 supports prefetch requests
8 supports audio channel control
9 supports Red Book addressing in addition to HSG
10 audio is playing
11 no disk in drive
12 supports R-W subchannels
</PRE>
<p>
<b>Category: <a href="cat-008.htm" tppabs="http://www.ctyme.com/intr/cat-008.htm">
Disk I/O Enhancements</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
- <a href="alpha-c.htm" tppabs="http://www.ctyme.com/intr/alpha-c.htm">
C</a>
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