mdhelp: add basic mux docs + screenie

docs/class/mpegts_mux.md

@@ -0,0 +1,86 @@
+Muxes are locations at which services can be found. On traditional 
+networks (DVB-C, -T and -S), these are carrier signals on which the 
+individual channels are multiplexed, hence the name. However, Tvheadend 
+also uses the term ‘mux’ to describe a source for multiple IP 
+streams - so an IP address, in effect.
+
+!['Mux List'](docresources/configdvbmux.png)
+
+---
+
+###Menu Bar/Buttons
+
+The following functions are available:
+
+Button         | Function
+---------------|---------
+**Save**       | Save any changes made to the mux entries.
+**Undo**       | Undo any changes made to the mux entries since the last save.
+**Add**        | Add a new mux.
+**Delete**     | Delete an existing mux.
+**Edit**       | Edit an existing mux. This allows you to change any of the parameters you’d otherwise set when adding a new mux, e.g. EPG scan, character set, etc.
+**View Level** | Change the interface view level to show/hide more advanced options.
+**Help**       | Displays this help page. 
+
+---
+
+###Playing a Mux
+
+You can stream a complete multiplex by copying/pasting the *Play* link 
+into the desired player/software.
+
+**Notes**:
+* The *Play* links don't link to the actual stream but to a playlist for 
+use with media players such as VLC, If you'd prefer to receive the raw 
+transport stream instead, you can do so by removing the `/play/` path from 
+the *Play* URL.
+* Not all devices support receiving a complete mux, notably low 
+powered set-top-boxes and older USB tuners. 
+
+---
+
+###Adding a Mux
+
+To add a mux press the *[Add]* button from the menu bar and select the 
+network you want to add the mux to.
+
+You only really need to add muxes if the pre-defined list didn't 
+work, e.g. because of out-of-date data as broadcasters re-arrange their 
+services or because automatic detection (network discovery) hasn't 
+successfully found all the muxes over time.
+
+!['Add Mux Dialog'](docresources/configaddmuxexample.png)
+
+**Notes**: 
+* Some tuners (or drivers) require more tuning parameters than 
+others so be sure to enter as many tuning parameters as possible.
+* Newly added muxes are automatically set to the *PEND* state.
+* Tvheadend won't scan the newly added mux instantly, it can take up to 
+10 minutes to begin an initial scan.
+
+---
+
+###Editing a Mux
+
+To edit a mux highlight the desired mux from within the grid, and 
+press the *[Edit]* button from the menu bar.
+
+**Tip**: You can also make changes to a mux from within the grid.
+
+---
+
+###Deleting a Mux
+
+To edit a mux highlight the desired mux from within the grid, and 
+press the *[Delete]* button from the menu bar. 
+
+Deleting a mux will also remove any associated services, including 
+those mapped to channels. If you have network discovery enabled any 
+previously deleted muxes found in the NIT during a scan will 
+automatically be re-added.
+
+**Tip**: You can select all muxes within the grid by pressing ctrl+A. 
+You can also ctrl+click to make additional selections, or shift+click to 
+select a range. 
+
+---

src/input/mpegts/mpegts_mux.c

@@ -487,11 +487,14 @@ mpegts_mux_ac3_list ( void *o, const char *lang )
   return strtab2htsmsg(tab, 1, lang);
 }
 
+CLASS_DOC(mpegts_mux)
+
 const idclass_t mpegts_mux_class =
 {
   .ic_class      = "mpegts_mux",
   .ic_caption    = N_("MPEG-TS multiplex"),
   .ic_event      = "mpegts_mux",
+  .ic_doc        = tvh_doc_mpegts_mux_class,
   .ic_perm_def   = ACCESS_ADMIN,
   .ic_save       = mpegts_mux_class_save,
   .ic_delete     = mpegts_mux_class_delete,