[Bug 733188] New: review debugging env vars

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733188
  GStreamer | gstreamer (core) | 1.x

           Summary: review debugging env vars
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ensonic at sonicpulse.de
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Current debug-log env vars

GST_DEBUG_FILE (defaults to stderr)
  when not set log to stderr, when set points to path for the debug log
GST_DEBUG_COLOR_MODE (defaults to color) (deprecated)
  when set use ansi color codes, otherwise plain text 
GST_DEBUG_NO_COLOR ("on", "auto", "off", "disable", "unix")
  on = auto: platform specific color codes
  off = disabled: no color codes
  unix = force ansi

Proposed env vars

GST_DEBUG_CHANNEL (defaults to stderr)
  stderr
  fd://stderr, fd://stdout
  file:///path/to/file (or /path/to/file , file)
  tcp://<ip>:<port> (or just <ip>:<port>)
  mem://<size>

  Log to the given channel.
  Alternative names GST_DEBUG_{STREAM,OUT,METHOD,....}

GST_DEBUG_FORMAT (default to text/auto-color)
  text/plain (plain text)
  text/auto-color (platform specific color codes)
  text/ansi (ansi color coded)
  binary/ctf (see babeltrace (Common Trace Format (CTF), e.g. used by lttng)

  These could be sort-of mime-types.

We also could discuss if we just want to have one at a time, or even allow
multiple pairs. The ater makes it tricky for the variables though.

Another alternative would be to merge CHANNEL+FORMAT as a uri:

GST_DEBUG_OUT=fd://stderr#format=text/plain&option1=value&option2=value

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