Sa4250 ch guid
From MythTV Official Wiki
Note: The correct title of this article is sa4250_ch_guid. It appears incorrectly here due to technical restrictions.
| Author | Bradley S. Corsello |
| Description | Channel-change script for use with Scientific Atlanta SA4250HD cable box using GUID. |
| Supports |
My Myth setup includes two SA4250HD STBs, which I control using Firewire. I've been using MajorIdiot's sa4250_ch channel changing program, but found it didn't handle multiple STBs well, so I modified it a bit.
My new setup has a shell wrapper, sa4250_ch_guid, and a modified version of Major's channel changer, sa4250_ch.
Invoke sa4250_ch_guid with the GUID of the box you want to control and the channel as parameters. You don't need the whole GUID, just enough of it to be a unique search key (there is no checking of this so make sure you have it right).
sa4250_ch_guid determines the node number of the STB with the given GUID and passes that as a parameter to sa4250_ch. This is necessary because node numbers often seem to change at unpredictable times.
sa4250_ch_guid
#!/bin/sh
#
# sa4250_ch_guid Copyright 2008 by Bradley S. Corsello
# Licensed under GPL
#
# Because the node number assigned to Firewire STBs can change, this~
# script changes channel on connnected SA4250 STB identified by GUID.
# You don't need to use the whole GUID, just enough to make it unique
#
GUID="$1"
CHANNEL="$2"
/usr/local/bin/sa4250_ch -n $(plugreport 2>/dev/null | awk '/'$GUID'/ {print $2}' - ) $CHANNEL
sa4250_ch.c
/*
* Samo's SA4250HD firewire channel changer by majoridiot
* with node selection added by Bradley S. Corsello
*
* requires: libavc1394-dev libraw1394-dev
*
* compile with: gcc -o sa4250_ch sa4250_ch.c -lrom1394 -lavc1394 -lraw1394
*
* based on mythtv source code and
*
* sa3250ch - an external channel changer for SA3250HD Tuner
* Based off 6200ch.c by Stacey D. Son
*
* Copyright 2004,2005 by Stacey D. Son ( mythdev a son d org )
* Copyright 2005 Matt Porter ( mporter a kernel d crashing d org )
* Portions Copyright 2006 Chris Ingrassia ( chris a spicecoffee org ) (SA4200
* and Single-digit command mode)
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <libavc1394/rom1394.h>
#include <libavc1394/avc1394.h>
#include <libraw1394/raw1394.h>
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/* SA42xxHD IDs */
#define SA4200HD_VENDOR_ID1 0x000014f8
#define SA4200HD_MODEL_ID1 0x00001072
#define SA4250HD_VENDOR_ID1 0x00001cea /* samo's stb */
#define SA4250HD_MODEL_ID1 0x000010cc /* samo's stb */
/* add additional vendor and model id's here- addition needed to if statement
* starting @ line 134 below
*/
#define AVC1394_SA3250_COMMAND_CHANNEL 0x000007c00
#define AVC1394_SA3250_OPERAND_KEY_PRESS 0xe7
#define AVC1394_SA3250_OPERAND_KEY_RELEASE 0x67
#define CTL_CMD0 AVC1394_CTYPE_CONTROL | AVC1394_SUBUNIT_TYPE_PANEL | \
AVC1394_SUBUNIT_ID_0 | AVC1394_SA3250_COMMAND_CHANNEL
#define CTL_CMD1 (0x04 << 24)
#define CTL_CMD2 0xff000000
#define STARTING_NODE 0
void usage()
{
fprintf(stderr, "Usage: sa4250_ch_new [-v] [-n <node>] -[k] <channel_num>\n");
fprintf(stderr, " -v : Verbose Mode\n");
fprintf(stderr, " -n : Node to change - default 0\n");
fprintf(stderr, " -k : Perform key release after channel change\n");
exit(1);
}
int main (int argc, char *argv[])
{
rom1394_directory dir;
int device = -1;
int single = 0;
int i;
int verbose = 0;
int keyrelease = 0;
int dig[3];
int chn = 708;
int unode = 0;
if (argc < 2)
usage();
for(i = 1; i < argc; ++i) {
if ((argv[i][0] == '-') && (strlen(argv[i]) > 1)) {
switch(argv[i][1]) {
case 'v':
verbose = 1;
break;
case 's':
single = 1;
break;
case 'n':
unode = atoi(argv[++i]);
break;
case 'k':
keyrelease = 1;
break;
default:
fprintf(stderr, "WARNING: Unknown option \'%c\', ignoring",
argv[i][1]);
}
}
else {
chn = atoi(argv[i]);
}
}
#ifdef RAW1394_V_0_8
raw1394handle_t handle = raw1394_get_handle();
#else
raw1394handle_t handle = raw1394_new_handle();
#endif
if (!handle) {
if (!errno) {
fprintf(stderr, "Not Compatible!\n");
} else {
perror("Couldn't get 1394 handle");
fprintf(stderr, "Is ieee1394, driver, and raw1394 loaded? "
"Are /dev/raw1394 permissions set correctly?\n");
}
exit(1);
}
if (raw1394_set_port(handle, 0) < 0) {
perror("ERROR-- could not set port");
raw1394_destroy_handle(handle);
exit(1);
}
int nc = raw1394_get_nodecount(handle);
if (rom1394_get_directory(handle, unode, &dir) < 0) {
fprintf(stderr,"ERROR reading config rom directory for node %d\n", unode);
raw1394_destroy_handle(handle);
exit(1);
}
if (verbose)
printf("node %d: vendor_id = 0x%08x model_id = 0x%08x\n",
unode, dir.vendor_id, dir.model_id);
/* add new vendor and model ids to if stanza below */
if ( ((dir.vendor_id == SA4250HD_VENDOR_ID1) &&
(dir.model_id == SA4250HD_MODEL_ID1)) ||
((dir.vendor_id == SA4200HD_VENDOR_ID1) &&
(dir.model_id == SA4200HD_MODEL_ID1)))
{
device = unode;
}
if (device == -1) {
fprintf(stderr, "Could not find SA42XXHD on the 1394 bus!\n");
fprintf(stderr, "Try running again with -v and check source code for "
"matching Vendor ID and Model ID-\n");
fprintf(stderr, "Add if necessary and recompile.\n");
raw1394_destroy_handle(handle);
exit(1);
}
if (verbose)
printf("Device acquired on node %d\n", device);
printf("Changing channel %d\n", chn);
quadlet_t cmd[3] =
{
CTL_CMD0 | AVC1394_SA3250_OPERAND_KEY_PRESS,
CTL_CMD1 | (chn << 8),
CTL_CMD2,
};
if (verbose)
printf("AV/C Command: cmd0=0x%08x cmd1=0x%08x cmd2=0x%08x\n",
cmd[0], cmd[1], cmd[2]);
avc1394_transaction_block(handle, device, cmd, 3, 1);
if (keyrelease) {
if (verbose)
printf("Performing key release\n");
quadlet_t cmd2[3] =
{
CTL_CMD0 | AVC1394_SA3250_OPERAND_KEY_RELEASE,
CTL_CMD1 | (chn << 8),
CTL_CMD2,
};
if (verbose)
printf("AV/C Command: cmd0=0x%08x cmd1=0x%08x cmd2=0x%08x\n",
cmd2[0], cmd2[1], cmd2[2]);
avc1394_transaction_block(handle, device, cmd2, 3, 1);
}
raw1394_destroy_handle(handle);
return 0;
}
