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    • Muhammad Faiz's avatar
      swresample: add exact_rational option · b8c6e5a6
      Muhammad Faiz authored
      give high quality resampling
      as good as with linear_interp=on
      as fast as without linear_interp=on
      tested visually with ffplay
      ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000, showcqt=gamma=5"
      ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:linear_interp=on, showcqt=gamma=5"
      ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:exact_rational=on, showcqt=gamma=5"
      
      slightly speed improvement
      for fair comparison with -cpuflags 0
      audio.wav is ~ 1 hour 44100 stereo 16bit wav file
      ffmpeg -i audio.wav -af aresample=osr=48000 -f null -
              old         new
      real    13.498s     13.121s
      user    13.364s     12.987s
      sys      0.131s      0.129s
      
      linear_interp=on
              old         new
      real    23.035s     23.050s
      user    22.907s     22.917s
      sys      0.119s     0.125s
      
      exact_rational=on
      real    12.418s
      user    12.298s
      sys      0.114s
      
      possibility to decrease memory usage if soft compensation is ignored
      Signed-off-by: 's avatarMuhammad Faiz <mfcc64@gmail.com>
      b8c6e5a6
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