[FFmpeg-trac] #5426(avcodec:open): wmavoice: problem with 2 modes

[FFmpeg]

#5426: wmavoice: problem with 2 modes
------------------------------------+-----------------------------------
             Reporter:  ami_stuff   |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  wmavoice    |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
------------------------------------+-----------------------------------

Comment (by rbultje):

 Some more digging: inside the postfilter, the issue is caused by adaptive
 gain control. This patch also works around the issue:

 @@ -824,8 +825,12 @@ static void postfilter(WMAVoiceContext *s, const
 float *synth,

      wiener_denoise(s, fcb_type, synth_pf, size, lpcs);

 +#if 1
 +    memcpy(samples, synth_pf, size * sizeof(*synth));
 +#else
      adaptive_gain_control(samples, synth_pf, synth, size, 0.99,
                            &s->postfilter_agc);
 +#endif

      if (s->dc_level > 8) {
          /* remove ultra-low frequency DC noise / highpass filter;

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5426#comment:7>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker