Print list of supported protocols

[gavv]

roc-recv and roc-send tools have option to print list of supported audio backends and formats:

$ roc-recv --list-supported
supported schemes for audio devices and files:
  pulse:// alsa:// oss:// file://

supported formats for audio files:
  .aifc .aiffc .aiff .aif .al .au .snd .avr .cdda .cdr .cvsd .cvs .cvu .dat
  .dvms .vms .f32 .f64 .gsrt .hcom .htk .ima .la .lu .maud .prc .s8 .s16
  .s24 .s32 .sf .ircam .sln .smp .sndr .sndt .sox .sph .nist .8svx .txw
  .u8 .sou .fssd .u16 .u24 .u32 .ul .voc .vox .wav .wavpcm .amb .wve .xa
  .amr-nb .anb .amr-wb .awb .caf .fap .flac .gsm .lpc10 .lpc .mat4 .mat
  .mat5 .mp3 .mp2 .paf .pvf .sd2 .sds .vorbis .ogg .w64 .wv .xi

We need to teach them to include information about supported protocols as well, something like this:

supported network protocols:
  audiosrc: rtp:// rs8m+rtp:// ldpc+rtp://
  audiorpr: rs8m:// ldpc://
  audioctl: rtcp://

Here, each line has interface name (audiosrc and others), and then lists protocols supported by this interface.

Steps:

• add two new methods to ProtocolMap: get_supported_interfaces(core::Array<Interface>&) (returns list of all interfaces for which there is at least one protocol) and get_supported_protocols(Interface, core::StringList&) (returns list of all protocols for given interface), similar to what we have in BackendDispatcher for supported schemes and formats

• add new function address::print_supported(const ProtocolMap&) (prints list of interfaces and protocols as described above), similar to sndio::print_supported

• update roc-recv and roc-send to invoke address::print_supported() after sndio::print_supported()

• update help message in .ggo files and manual pages

[Hrick87]

Hi, after reading over the issue and relevant links to code, I've decided this would be a good first contribution for me. If its still available can you assign me this task? Thank you.

[gavv]

Sure, you're welcome, thanks!