[FFmpeg-trac] #4874(undetermined:new): AAC decoder frame->nb_samples & frame->channels is wrong at get_buffer2

[FFmpeg]

#4874: AAC decoder frame->nb_samples & frame->channels is wrong at get_buffer2
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             Reporter:  zylthinking  |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  aac          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:

 when set the get_buffer2 to a custom one, trace in the custom get_buffer2
 1. if the profile is FF_PROFILE_AAC_HE, then frame->channels is 1 at the
 first call, then changed to 2 in the following calls, In this case, the
 result pcm sounds well (but it is just luck I guess)

 2. if the  profile is FF_PROFILE_AAC_LOW, then the  frame->channels is 2
 at all time, in this case, the result pcm is full of noise

 Both conditions have a frame->nb_samples == 2048
 however, it is indeed should be 1024 at both case after some research and
 the frame->channels should be 2

 How to reproduce:
 {{{
 any aac can be used for testing
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4874>
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