『第 15 楼』:
使用 LLM 解释/回答一下
好久没有来了, 想不到还有不少人关注
分享一下源码....
/***************************************************************************
name: atapiEject
action: loads or ejects CD-ROM
returns:whatever atapiCmd() returns
****************************************************************************/
static int atapiEject(driveinfo *Drive, bool Load)
{
u8 Pkt={ATAPI_CMD_START_STOP, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
drivecmd Cmd;
printf("atapiEject:");
memset(&Cmd, 0, sizeof(Cmd));
Pkt= (Load ? 3 : 2);
return(atapiCmd(Drive, &Cmd, Pkt));
}
/***************************************************************************
name: atapiGetEventStatus
action: Get Disc is present && Tray opend or Closed
returns: whatever atapiCmd() returns
****************************************************************************/
static int atapiGetEventStatus(driveinfo *Drive, u8 *Buffer, unsigned Count)
{
u8 Pkt={ATAPI_CMD_GET_EVENT, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
drivecmd Cmd;
printf("atapiGetEventStatus:");
memset(&Cmd, 0, sizeof(Cmd));
Cmd.Count=Count;
Cmd.Data=Buffer;
Pkt=1;
Pkt=0x10;
Pkt=Count;
return(atapiCmd(Drive, &Cmd, Pkt));
}
/***************************************************************************
name: atapiChkTrayIsOpen
action: check cd-rom tray opened or closed
returns: 1 is opend , 0 is closed and -1 is Error
****************************************************************************/
static int atapiChkTrayIsOpen(driveinfo *Drive)
{
u8 Buffer;
int Temp;
Temp=atapiGetEventStatus(Drive, Buffer, 6);
if (Temp != 0)
{
return(-1);
}
return(Buffer&0x01); // Bit 0 is Tray Status, See SFF-8090 v6R7 P362
}
/***************************************************************************
name: atapiTOCEnt
action: reads one or more table-of-contents entries from audio CD
returns:whatever atapiCmd() returns
****************************************************************************/
static int atapiTOCEnt(driveinfo *Drive, u8 *Buffer, unsigned Count)
{
u8 Pkt={ATAPI_CMD_READTOC, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
drivecmd Cmd;
printf("atapiTOCEnt:");
memset(&Cmd, 0, sizeof(Cmd));
Cmd.Count=Count;
Cmd.Data=Buffer;
Pkt=2;
Pkt=Count >> 8;
Pkt=Count;
return(atapiCmd(Drive, &Cmd, Pkt));
}
/***************************************************************************
name: atapiTOC
action: reads table of contents of audio CD and prints starting
time of each track
returns:whatever atapiCmd() returns
****************************************************************************/
static int atapiTOC(driveinfo *Drive)
{
u8 *Entry, Buffer;
int TOCEnt, Temp;
printf("atapiTOC:\n");
// 16-bit TOC length, 8-bit first track, 8-bit last track
TOCEnt = 4;
#ifdef DEBUG
printf(" calling atapiTOCEnt with Count=%u\n", TOCEnt);
#endif
// Read TOC
Temp=atapiTOCEnt(Drive, Buffer, TOCEnt);
if(Temp != 0)
{
return(Temp);
}
// NumTracks = LastTrack - FristTrack + 1
NumTracks=Buffer - Buffer + 1;
// Check NumTracks(must in range 1~99)
if(NumTracks <= 0 || NumTracks > 99)
{
printf(" error: bad number of tracks %d\n", NumTracks);
return(-1);
}
// Check MAX_TRACKS handle
if(NumTracks > MAX_TRACKS)
{
printf(" warning: too many tracks(%u); reducing to %u.\n",NumTracks, MAX_TRACKS);
NumTracks=MAX_TRACKS;
}
// read 4-byte header and 8-byte table-of-contents entries
TOCEnt = 4 + 8 * (NumTracks+1);
#ifdef DEBUG
printf(" calling atapiTOCEnt with Count=%u\n", TOCEnt);
#endif
// Read TOC
Temp=atapiTOCEnt(Drive, Buffer, TOCEnt);
if(Temp != 0)
{
return(Temp);
}
// point to first TOC entry
Entry=Buffer + 4;
// read NumTracks+1 entries the last entry is for the disk lead-out
for(Temp=0; Temp < NumTracks + 1; Temp++)
{
Track.Min=Entry;
Track.Sec=Entry;
Track.Frame=Entry;
printf("%02u:%02u:%02u ", Track.Min, Track.Sec, Track.Frame);
// advance to next entry
Entry += 8;
}
printf("\n");
return(0);
}
/***************************************************************************
name: atapiPlay
action: plays audio from time index Start to End (units of 1/75 sec)
returns:whatever atapiCmd() returns
****************************************************************************/
static int atapiPlay(driveinfo *Drive, atapimsf *Start, atapimsf *End)
{
u8 Pkt={ATAPI_CMD_PLAY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
drivecmd Cmd;
printf("atapiPlay:");
memset(&Cmd, 0, sizeof(Cmd));
Pkt=Start->Min;
Pkt=Start->Sec;
Pkt=Start->Frame;
Pkt=End->Min;
Pkt=End->Sec;
Pkt=End->Frame;
return(atapiCmd(Drive, &Cmd, Pkt));
}
/***************************************************************************
name: atapiPause
action: pauses or continues audio CD
returns:whatever atapiCmd() returns
****************************************************************************/
static int atapiPause(driveinfo *Drive, bool Continue)
{
u8 Pkt={ATAPI_CMD_PAUSE,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
drivecmd Cmd;
printf("atapiPause:");
memset(&Cmd, 0, sizeof(Cmd));
Pkt=Continue ? 1 : 0;
return(atapiCmd(Drive, &Cmd, Pkt));
}
/***************************************************************************
name: atapiStop
action: stop audio play or scan
return: whatever atapiCmd() returns
****************************************************************************/
static int atapiStop(driveinfo *Drive)
{
u8 Pkt={ATAPI_CMD_STOP,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
drivecmd Cmd;
printf("atapiStop:");
memset(&Cmd, 0, sizeof(Cmd));
return(atapiCmd(Drive, &Cmd, Pkt));
}
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