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Multi threading #201

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Multi threading #201

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Commits on Sep 14, 2023

  1. libsamplerate multi-thread (OpenMP) implementation 

    compiled and tested on
--
FreeBSD clang version 14.0.5 (https://github.com/llvm/llvm-project.git llvmorg-14.0.5-0-gc12386ae247c)
Target: x86_64-unknown-freebsd13.2
Thread model: posix
--
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  2. MT disable by default.

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Commits on Sep 15, 2023

  1. error handlings and small refactor

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Commits on Sep 16, 2023

  1. some more optimize

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Commits on Sep 17, 2023

  1. correct indentation

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Commits on Nov 12, 2023

  1. - Windows (MSVC) support 

    - eliminate redundant buffer
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Commits on Nov 14, 2023

  1. ensure the number of threads actually used by omp to have the barrier… 

    … logic work correctly.
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  2. change threading strategy because overhead of allocating extra work b… 

    …uffer for each thread seems to be larger in fewer channel process cases.
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Commits on Nov 16, 2023

  1. allow odd numbers of threads 

    prefetch coefft to cache memory
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  2. format style

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  3. fix for debug build

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Commits on Nov 17, 2023

  1. change WIN32 to MSVC for openmp build option switch

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  2. cache once-calculated coeffs if src_ratio is integer

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  3. fix type and clarify zero

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  4. unnecessary (wrongly merged) cast removal

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Commits on Nov 18, 2023

  1. change _WIN32 to _MSC_VER

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Commits on Dec 16, 2023

  1. loop termination condition fix

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  2. undo loop termination condition fix, and make the decision equivalent… 

    … to the single-thread version.

note: the (single-thread) implementation may have some underlying bug here because the number of output frames is seemingly
inconsistent depending on the combinations of src_ratio, input frames, and number of channels.
The fix should be out of scope for this PR (MultiThreading).
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