Messages in this thread | | | Date | Sat, 27 Nov 2004 10:54:58 +0100 (CET) | Subject | Re: Re: Is controlling DVD speeds via SET_STREAMING supported? | From | "Thomas Fritzsche" <> |
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Hi Jens,
I build a new version that addresse this issues.
Usage: speed -x <speed> <device> (speed = 0 means reset to defaults)
Cheers, Thomas Fritzsche
http://noto.de/vdr/speed-1.0.c ------------------------------------------------------- /* * speed - use SET STREAMING command to set the speed of DVD-drives * * * Copyright (c) 2004 Thomas Fritzsche <tf@noto.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */
#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <string.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/cdrom.h>
void dump_sense(unsigned char *cdb, struct request_sense *sense) { int i;
printf("Command failed: ");
for (i=0; i<12; i++) printf("%02x ", cdb[i]);
if (sense) { printf(" - sense: %02x.%02x.%02x\n", sense->sense_key, sense->asc, sense->ascq); } else { printf(", no sense\n"); } }
int main(int argc, char *argv[]) { char *device = "/dev/cdrom"; int c,fd; int speed = 0; unsigned long rw_size;
unsigned char buffer[28];
struct cdrom_generic_command cgc; struct request_sense sense; extern char * optarg;
while((c=getopt(argc,argv,"x:"))!=EOF) { switch(c) { case 'x': speed = atoi(optarg); break; default: printf("Usage: speed [-x speed] [device]"); return -1; } }
if (argc > optind) device = argv[optind];
fd = open(device, O_RDONLY | O_NONBLOCK); if (fd < 0) { printf("Can't open device %s\n", device); return -1; }
memset(&cgc, 0, sizeof(cgc)); memset(&sense, 0, sizeof(sense)); memset(&buffer, 0, sizeof(buffer));
/* SET STREAMING command */ cgc.cmd[0] = 0xb6; /* 28 byte parameter list length */ cgc.cmd[10] = 28;
cgc.sense = &sense; cgc.buffer = buffer; cgc.buflen = sizeof(buffer); cgc.data_direction = CGC_DATA_WRITE; cgc.quiet = 1;
if(speed == 0) { /* set Restore Drive Defaults */ buffer[0] = 4; }
buffer[8] = 0xff; buffer[9] = 0xff; buffer[10] = 0xff; buffer[11] = 0xff;
rw_size = 177 * speed;
/* read size */ buffer[12] = (rw_size >> 24) & 0xff; buffer[13] = (rw_size >> 16) & 0xff; buffer[14] = (rw_size >> 8) & 0xff; buffer[15] = rw_size & 0xff;
/* read time 1 sec. */ buffer[18] = 0x03; buffer[19] = 0xE8;
/* write size */ buffer[20] = (rw_size >> 24) & 0xff; buffer[21] = (rw_size >> 16) & 0xff; buffer[22] = (rw_size >> 8) & 0xff; buffer[23] = rw_size & 0xff;
/* write time 1 sec. */ buffer[26] = 0x03; buffer[27] = 0xE8;
if (ioctl(fd, CDROM_SEND_PACKET, &cgc) != 0) if (ioctl(fd, CDROM_SELECT_SPEED, speed) != 0) { dump_sense(cgc.cmd, cgc.sense); printf("ERROR.\n"); return -1; } printf("OK...\n"); return 0; } -------------------------------------------------------
> Hi Jens, > > absolute correct! I just tested it with speed = 1 yesterday night > (quick&duty). This is just a code snap to show that it's possible to set > the speed of a DVD drive this way. > > You also wrote about the "End LBA" field in your other mail. > I set this to 0xffffffff but you think that this could be a problem if the > device don't have this LBA. The spec only writes this: > "The End LBA field is the last logical block for which the performance > request is being made." So it should be standard conform if we set here a > higher block number. Do you have experience with other (than NEC ND-3500) > drive that don't support this? > > Using this high last block number would make sence, because it looks like > this setting is still valid if the media is changed (other end block!?). > > Spec: > "The performance setting is persistent and remains until a new descriptor > is sent. The setting only applies to the extent > identified by the Start and End LBA field. Only zero or one performance > extents shall be valid at any time." > > What do you think? > > I also found out, that the Realtime-Streaming Feature is mandatory for all > kinds of DVD-+R+-RW-RAM drives. So it might be sufficient to simply use > SET STREAMING for DVD drives and SET SPEED for CD-R's. Isn't it? > > I will also enhance this tool by setting the RDD flag if the user selects > speed = 0. > > Thanks and kind regards, > Thomas Fritzsche > >> I should have read this more closely... You need to fill the speed > fields correctly: >> >> unsigned long read_size = 177 * speed; >> >> buffer[12] = (read_size >> 24) & 0xff; >> buffer[13] = (read_size >> 16) & 0xff; >> buffer[14] = (read_size >> 8) & 0xff; >> buffer[15] = read_size & 0xff; >> >> Ditto for write size. >> >> -- >> Jens Axboe >> >> > > > >
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