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opus 1.5.2

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- Update to 1.5.1:
  * Significant improvement to packet loss robustness using
    Deep Redundancy (DRED)
  * Improved packet loss concealment through Deep PLC
  * Low-bitrate speech quality enhancement down to
    6 kb/s wideband
  * Improved x86 (AVX2) and Arm (Neon) optimizations
  * Support for 4th and 5th order ambisonics

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- Update to version 1.4:
  * Improved tuning of the Opus in-band FEC (LBRR). See the
    https://gitlab.xiph.org/xiph/opus/-/issues/2360 for details
  * Added a OPUS_SET_INBAND_FEC(2) option that turns on FEC, but
    does not force SILK mode (FEC will be disabled in CELT mode)
  * Improved tuning and various fixes to DTX
  * Added Meson support, improved CMake support
- Change Source to new home on github.
- Use autosetup, make_build and ldconfig_scriptlets macros.
- Move AUTHORS and README docs to devel package.
- Drop patches fixed upstream:
  * opus-Fix-celt-decoder-assertion-when-using-OPUS_CUSTOM.patch
  * opus-Silk-CNG-adapts-faster.patch
  * opus-Silk-fix-arm-optimization.patch


NOTE: Did not change spec to use meson on purpose, since this is the first release with meson support, we can make that change on the next version upgrade, where I hope there is less risk of hidden bugs with the new buildsystem.

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- Backport of an upstream fix for celt decoder:
  * opus-Fix-celt-decoder-assertion-when-using-OPUS_CUSTOM.patch: When
    using OPUS_CUSTOM, `CELTDecoder->end` can be larger than 21.
    Assert against 25 instead in OPUS_CUSTOM builds.

This patch is intended to fix a crash in Jamulus, originally reported here:
https://sourceforge.net/p/llcon/discussion/software/thread/7fdbc8cbb0/

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- Add 2 upstream bug fixes for Silk:
  * opus-Silk-CNG-adapts-faster.patch: Silk CNG adapts faster to
    received packets with lower gains.
  * opus-Silk-fix-arm-optimization.patch: Avoid processing LPC
    coeffs beyond the given order in NEON optimizations.

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- Own %{_datadir}/aclocal: when we might switch to pkgconf instead
  of pkg-config, nothing in the build root is 'accidentally' owning
  this directory for us.

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- Update to version 1.3.1
  * This release fixes an issue with the analysis on files with
    digital silence (all zeros), especially on x87 builds
    (mostly affects 32-bit builds).
  * Two new features:
    + A new OPUS_GET_IN_DTX query to know if the encoder is in
      DTX mode (last frame was either a comfort noise frame or
      not encoded at all)
    + A new (and still experimental) CMake-based build system
      that is eventually meant to replace the VS2015 build
      system (the autotools one will stay).

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- Update to 1.3:
    - improved speech/music detection based on a neural network
    - low-bitrate speech improvements
    - support for immersive audio using ambisonics
    - tone quality improvements
    - updates to the Opus standard (rfc 8251) are on by default
    - security improvements
- Clean up SPEC to the latest standards

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baserev update by copy to link target

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minor tweak while we are at it

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Rebase .changes to follow standard done before

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New stable release

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- Cleanup with spec-cleaner

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