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Last time I worked with aptx directly was in the CSR days, but they used to have a library they'd provide in binary form only for your specific platform and com

Last time I worked with aptx directly was in the CSR days, but they used to have a library they'd provide in binary form only for your specific platform and compiler settings. It was fuck-off expensive ($1+/device + certification), so the easier way to do things was just to buy their silicon which had the IP "for free". A couple years back someone put a decoder of dubious legality into FFMPEG [1], though. The code was subsequently migrated into bluez as well. [1] https://ffmpeg.org/doxygen/trunk/aptx_8c_source.html https://ffmpeg.org/doxygen/trunk/aptx_8c_source.html

bubblethink 4y ago
>dubious legality into FFMPEG Why dubious ? FFMPEG is not incorporated in the US and does not recognize software patents. All the popular codecs such as h264, h265, etc. are similar in nature.
- AlotOfReading 4y ago
  Because it was reverse engineered from binaries, not cleanroom. I certainly wouldn't risk using it for a product, much less advertise it as a feature given Qualcomm's history in this space and the myriad ways they can make your life absolute hell even if you're 100% in the right. Qualcomm is not a nice company.
  - bubblethink 4y ago
    I meant that a large number of codecs supported by FFMPEG are patent encumbered, and nobody ships them in the US. This is well known. Even distros based in the US such as Fedora/RHEL do not ship them out of the box. So clean room v/s reverse engineered gets into a secondary issue that is mostly moot.
    - AlotOfReading 4y ago
      Sure, but since Qualcomm is never going to give anyone a license to use it and the lack of cleanroom means the provenance is somewhat uncertain, I think "dubiously legal" is a perfectly acceptable description. It's not like I'm saying it shouldn't exist or anything. Just, be aware that the semiconductor mafia considers this part of their turf and wear some kneepads if you're going to make money with it.

bubblethink 4y ago

>dubious legality into FFMPEG Why dubious ? FFMPEG is not incorporated in the US and does not recognize software patents. All the popular codecs such as h264, h265, etc. are similar in nature.

AlotOfReading 4y ago
Because it was reverse engineered from binaries, not cleanroom. I certainly wouldn't risk using it for a product, much less advertise it as a feature given Qualcomm's history in this space and the myriad ways they can make your life absolute hell even if you're 100% in the right. Qualcomm is not a nice company.
- bubblethink 4y ago
  I meant that a large number of codecs supported by FFMPEG are patent encumbered, and nobody ships them in the US. This is well known. Even distros based in the US such as Fedora/RHEL do not ship them out of the box. So clean room v/s reverse engineered gets into a secondary issue that is mostly moot.
  - AlotOfReading 4y ago
    Sure, but since Qualcomm is never going to give anyone a license to use it and the lack of cleanroom means the provenance is somewhat uncertain, I think "dubiously legal" is a perfectly acceptable description. It's not like I'm saying it shouldn't exist or anything. Just, be aware that the semiconductor mafia considers this part of their turf and wear some kneepads if you're going to make money with it.