Tvheadend

There are a few problems with how the TV adapter tab is implemented today

* It cannot handle a large amount of services. With DVB-S you can easily hit >1k services. Ticket #100

* It's hard (but possible via sorting) to see which services that is transmitted on which mux.

* The DVB satconf solution is a bit cumbersome

* Updates to the quality meter indicator refreshed the grid in a way that is bad UX. Ticket #108

* If a DVB adapter is renamed by the kernel after boot (/dev/dvb/adapterX -> /dev/dvb/adapterY) the user must do a lot of work

* Inter-adapter dependencies are not handled (adapters with both analog and digital receivers, etc)

Therefore the plan is to totally redesign how Tvheadend interacts with hardware.

h1. Device tree

This tree will present the available devices to the user

<pre>

  + DVB Adapter #1

  | + DVB-C Frontend

  |

  + DVB Adapter #2

  | + DVB-T Frontend

  | + DVB-C Frontend

  |

  + DVB Adapter #3

  | + DVB-S Frontend

  | | + Switchport 1

  | | + Switchport 2

  | | + Switchport 3

  | | + Switchport 4

  | | + Switchport n

  | + DVB-T Frontend

  |

  + V4L Adapter #1

    + Tuner

    + Composite

    + S-Video

</pre>

Pressing on a node will present the user with information about the entry and a few configuration options as follows:

h2. DVB / ATSC Adapter

h3. Info part

Various information about the hardware

h3. Config part

* Enable/Disable adapter

h2. DVB-C / DVB-T / ATSC Frontends

h3. Info part

TBD

h3. Config part

* Network the frontend is attached to

* If this device may update network configuration

h2. DVB-S Frontends

h3. Info part

TBD

h3. Config part

* Number of Diseqc switchports

 or 

* Network the frontend is attached to

* If this device may update network configuration

* LnB configuration

h2. Switchport

h3. Info part

TBD

h3. Config part

* Network the switchport is attached to

* If this device may update network configuration

* LnB configuration

h2. V4L adpater

h3. Info part

Various information about the hardware

h3. Config part

* Enable/Disable adapter

h2. V4L frontends

h3. Info part

Various information about the hardware

h3. Config

* TV system type (PAL, NTSC, etc) (for tuners)

* Network the frontend is attached to

h1. DVB Networks

<pre>

  + DVB Network #1 (Comhem Stockholm)   <- network

  | + 290 MHz                           <- mux

  |   + SVT 1                           <- service

  |   | + Video MPEG2 768*576i          <- elementary stream

  |   | | Audio MPEG2 Stereo

  |   + SVT 2

  |   | + Video MPEG2 768*576i

  |   | | Audio MPEG2 Stereo

  | + 298 MHz

  |   |...

</pre>

The DVB networks can then be attached to one or more adapters (DVB-C and DVB-S case)

For DVB-S adapters a network could be attached directly to the adapter or to a switchport, etc. This depends a bit on how the adapter is configured.

h1. Device mapper

Upon startup Tvheadend will try to map the available hardware to the adapters as good as it can. 

* device type AND device name AND bus-id AND device path 

* device type AND device name AND bus-id

* device type AND device name

* device type AND bus-id

* device type

||device path||Path in filesystem||/dev/dvb/...||

||bus-id||Hardware address||Bus 001 Device 004: ID 0ccd:0038 [[TerraTec]] Electronic GmbH Cinergy T2 DVB-T Receiver

||device-name||Name of device(vendor) as reported via DVB API||ST STV0297 DVB-C||

||device-type||Frontend type(s)||DVB-T, DVB-C, etc||

It will start will all devices and try rule 1 then all devices that could not be mapped and rule 2, and so on.

This will mitigate problems when USB controllers probe devices in different order, etc

Also you can swap your DVB hardware to a new one (different vendor) and still have tvheadend map it correctly.

If the mapper cannot find a hardware device using the first rule the adapter info/configuration will highlight this

and the user will be able to "nail" the configuration to the detected hardware. Ie. to acknowledge to Tvheadend

that: "Yes, this is the correct hardware. I've changed/moved it" or whatever