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    • Nicolas George's avatar
      ALSA demuxer: use av_gettime and a timefilter. · 5d35b279
      Nicolas George authored
      The PTS for captured audio was measured using snd_pcm_htimestamp.
      
      snd_pcm_htimestamp hangs when the input is a dsnoop plugin.
      
      Furthermore, at some point, snd_pcm_htimestamp started returning monotonic
      timestamps rather than wall clock timestamps, in most but not all
      situations.
      Monotonic timestamps are fine, but ffmpeg uses wall clock timestamps
      everywhere else, and we have no API to inform the user which kind of
      timestamps it is.
      
      A separate snd_pcm_htimestamp is only slightly less accurate than
      snd_pcm_htimestamp: the standard deviation for the difference between two
      consecutive timestamps is (on my hardware):
      - ~13 µs with snd_pcm_htimestamp;
      - ~35 µs with av_gettime;
      -  ~5 µs with av_gettime and a timefilter.
      5d35b279
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