Sa4250 ch guid
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.
#!/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
/* * 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; }