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public:general:rotating_capture_system_with_hdhomerun [2016/08/02 19:45] (current)
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 +====== Rotating capture system with HDHomeRun ======
 +
 +This is Carlos'​ quick and dirty solution to have a grid with captions from all stations using a few tuners, obviously by rotating them to cover all channels.
 +
 +File directories:​
 +  */bin/ -> Scripts
 +  */channels/ -> Channels, each file being a channel. If name starts with a C then it's cable, if it's a B it'​s ​ broadcast, anything else is ignored.
 +  */tuners/ -> One file per tuner, with this naming\\ ​    ​$devicetype-$tunertype-$masterorregular-$deviceid-$tunernumber\\ where\\ $devicetype is always HDR (for now only HDHomeRun is supported)\\ $tunertype is USC (US-cable) or USB (US-broadcast)\\ $masterorregular is M or R, if M then this tuner will be used to scan for channels by the chanscan script that populates the /channels/ directory\\ $deviceid is the device ID. For HDHomeRun is returned by hdhomerun_config\\ $tunernumber is the number within the device, so for a device with 3 tuners it's 0-2
 +
 +Scripts:
 +
 +  */​bin/​tuner_scan -> Discover HDHomeRun devices and features, build contents of /tuners/
 +  */​bin/​channel_scan -> Scan for channels, build contents of /channels/
 +  */​bin/​cc_boot -> Starts one capture process per tuner
 +  */​bin/​cc_capture -> Using one of the tuners, capture data from a channel in round-robin
 +
 +The /channels/ directory contains one file per channel. When a channel is being recorded its file must be renamed to $name.inuse. When done, touched, then renamed back to $name.free. If a process attempts to rename a channel file and fails it must assume that some other process picked up that channel and must continue to the next one.
 +
 +The cc_capture script always reads contents of /channels/ and picks the oldest file that is free (meaning there isn't another process capturing it). 
 +
 +Done:
 +  * Create system user (captions), copy public key
 +  * Edit sudoers
 +
 +To-do:
 +  * Create tuner_scan
 +  * Create channel_scan
 +  * Create cc_capture
 +  * Create cc_boot
 +
  
  • public/general/rotating_capture_system_with_hdhomerun.txt
  • Last modified: 2016/08/02 19:45
  • (external edit)