[Bug 754178] gst-discoverer doesn't detect both audio and video of RTSP streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754178

--- Comment #19 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Here's yet another take on this, as Sebastian asked previously, this patch only
posts a topology once all the decodebins have posted theirs, then posts a new,
correctly updated topology every time a decodebin posts a new topology (the old
topology is replaced with the new one).

As for the whole "container" issue, I'm afraid we can't do much without
breaking an unfortunate amount of programs calling that API.

The previously proposed patch had all discoveries wrapped in a dummy container,
this new patch at least retains the old behavior for the standard case where a
single topology was obtained and propagated upstream, the only case where we do
have a dummy container is the previously-broken case, such as the one this
issue was about.

Here's an example output:

 meh   master  ~  devel  sandbox  gst-build-master  GST_DEBUG=0
gst-discoverer-1.0 -v rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov
Analyzing rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov
Done discovering rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov

Topology:
  container: text/x-uri
    unknown: application/x-rtp, media=(string)video, payload=(int)97,
clock-rate=(int)90000, encoding-name=(string)H264,
packetization-mode=(string)1, profile-level-id=(string)42C01E,
sprop-parameter-sets=(string)"Z0LAHtkDxWhAAAADAEAAAAwDxYuS\,aMuMsg\=\=",
a-framesize=(string)240-160, a-sdplang=(string)en,
a-cliprect=(string)"0\,0\,160\,240", a-framerate=(string)24.0,
ssrc=(uint)695662262, clock-base=(uint)0, seqnum-base=(uint)1,
npt-start=(guint64)0, npt-stop=(guint64)596480000000, play-speed=(double)1,
play-scale=(double)1
      video: video/x-h264, stream-format=(string)avc, alignment=(string)au,
codec_data=(buffer)0142c01effe100156742c01ed903c56840000003004000000c03c58b9201000468cb8cb2,
level=(string)3, profile=(string)constrained-baseline, width=(int)240,
height=(int)160, framerate=(fraction)0/1, interlace-mode=(string)progressive,
parsed=(boolean)true
        Tags:
          video codec: H.264 (Constrained Baseline Profile)

        Codec:
          video/x-h264, stream-format=(string)avc, alignment=(string)au,
codec_data=(buffer)0142c01effe100156742c01ed903c56840000003004000000c03c58b9201000468cb8cb2,
level=(string)3, profile=(string)constrained-baseline, width=(int)240,
height=(int)160, framerate=(fraction)0/1, interlace-mode=(string)progressive,
parsed=(boolean)true
        Additional info:
          None
        Stream ID:
b62e9a00f1bd1881d4e436344e14b135d8ac17373100c4fe9903286bb006129a/video:0:0:RTP:AVP:97
        Width: 240
        Height: 160
        Depth: 24
        Frame rate: 0/1
        Pixel aspect ratio: 1/1
        Interlaced: false
        Bitrate: 0
        Max bitrate: 0
    unknown: application/x-rtp, media=(string)audio, payload=(int)96,
clock-rate=(int)12000, encoding-name=(string)MPEG4-GENERIC,
encoding-params=(string)2, profile-level-id=(string)1, mode=(string)AAC-hbr,
sizelength=(string)13, indexlength=(string)3, indexdeltalength=(string)3,
config=(string)1490, a-sdplang=(string)en, ssrc=(uint)969373029,
clock-base=(uint)0, seqnum-base=(uint)1, npt-start=(guint64)0,
npt-stop=(guint64)596480000000, play-speed=(double)1, play-scale=(double)1
      audio: audio/mpeg, mpegversion=(int)4, stream-format=(string)raw,
codec_data=(buffer)1490, framed=(boolean)true, level=(string)1,
base-profile=(string)lc, profile=(string)lc, rate=(int)12000, channels=(int)2
        Tags:
          audio codec: MPEG-4 AAC

        Codec:
          audio/mpeg, mpegversion=(int)4, stream-format=(string)raw,
codec_data=(buffer)1490, framed=(boolean)true, level=(string)1,
base-profile=(string)lc, profile=(string)lc, rate=(int)12000, channels=(int)2
        Additional info:
          None
        Stream ID:
b9049c323800fa1dbf0c9c2f5d6dcf0e63b50fc2c5030d1c14e44a893d14e333/audio:0:0:RTP:AVP:96
        Language: <unknown>
        Channels: 2
        Sample rate: 12000
        Depth: 32
        Bitrate: 0
        Max bitrate: 0

Properties:
  Duration: 0:09:56.480000000
  Seekable: yes
  Tags: 
      audio codec: MPEG-4 AAC
      video codec: H.264 (Constrained Baseline Profile)

 meh   master  ~  devel  sandbox  gst-build-master 

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