Messages in this thread | | | Date | Thu, 25 Nov 2004 09:04:51 +0100 | From | Jens Axboe <> | Subject | Re: Re: Is controlling DVD speeds via SET_STREAMING supported? |
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On Wed, Nov 24 2004, Thomas Fritzsche wrote: > /* 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; > > buffer[8] = 0xff; > buffer[9] = 0xff; > buffer[10] = 0xff; > buffer[11] = 0xff; > > buffer[15] = 177*speed; > buffer[18] = 0x03; > buffer[19] = 0xE8;
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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