Changes between Initial Version and Version 1 of Ticket #5334, comment 12


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Timestamp:
Nov 26, 2018, 5:42:03 PM (2 years ago)
Author:
Maximumspatium
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  • Ticket #5334, comment 12

    initial v1  
    11Atrac lossless appears to be abandoned today.
    22
    3 As author of both Atrac3 and Atrac3plus implementations in ffmpeg, I think it should be possible to provide a quick support for decoding of the base layer which is simply either Atrac3 or Atrac3plus.
     3As author of both Atrac3 and Atrac3plus implementations in ffmpeg, I think it should be possible to provide a quick support for decoding of the '''base layer''' which is simply either Atrac3 or Atrac3plus.
    44
    55The lossless property is achieved by the so-called '''enhancement layer''' (that's how Sony guys calls the residual data). It transmits differences between the original signal and its lossy encoding using Atrac3/Atrac3plus. I believe that due to the nature of the residual consisting of very small differences, some kind of entropy encoding is employed. Understanding it will be probably rather easy compared with the sophisticated lossy algorithms used in the base layer.