Add a simple filter example with FFTW
This commit is contained in:
Robbert van der Helm
parent
295e5493ec
commit
0f78b02685
367
Cargo.lock
generated
367
Cargo.lock
generated
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@ -18,6 +18,12 @@ version = "0.1.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a13739d7177fbd22bb0ed28badfff9f372f8bef46c863db4e1c6248f6b223b6e"
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[[package]]
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name = "adler"
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version = "1.0.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
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[[package]]
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name = "ahash"
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version = "0.7.6"
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@ -29,6 +35,15 @@ dependencies = [
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"version_check",
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]
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[[package]]
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name = "aho-corasick"
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version = "0.5.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ca972c2ea5f742bfce5687b9aef75506a764f61d37f8f649047846a9686ddb66"
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dependencies = [
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"memchr 0.1.11",
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]
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[[package]]
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name = "anyhow"
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version = "1.0.55"
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@ -71,7 +86,7 @@ dependencies = [
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"objc",
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"raw-window-handle",
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"uuid",
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"winapi",
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"winapi 0.3.9",
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"x11",
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"xcb 0.9.0",
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"xcb-util",
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@ -89,6 +104,33 @@ version = "0.1.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "0d8c1fef690941d3e7788d328517591fecc684c084084702d6ff1641e993699a"
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[[package]]
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name = "byteorder"
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version = "1.4.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
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[[package]]
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name = "bzip2"
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version = "0.4.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6afcd980b5f3a45017c57e57a2fcccbb351cc43a356ce117ef760ef8052b89b0"
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dependencies = [
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"bzip2-sys",
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"libc",
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]
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[[package]]
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name = "bzip2-sys"
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version = "0.1.11+1.0.8"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "736a955f3fa7875102d57c82b8cac37ec45224a07fd32d58f9f7a186b6cd4cdc"
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dependencies = [
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"cc",
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"libc",
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"pkg-config",
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]
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[[package]]
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name = "cargo-nih-plug"
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version = "0.1.0"
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@ -108,6 +150,16 @@ version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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[[package]]
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name = "chrono"
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version = "0.2.25"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9213f7cd7c27e95c2b57c49f0e69b1ea65b27138da84a170133fd21b07659c00"
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dependencies = [
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"num",
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"time",
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]
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[[package]]
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name = "clap-sys"
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version = "0.1.0"
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@ -120,7 +172,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9fdf5e01086b6be750428ba4a40619f847eb2e95756eee84b18e06e5f0b50342"
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dependencies = [
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"lazy-bytes-cast",
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"winapi",
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"winapi 0.3.9",
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]
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[[package]]
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@ -209,6 +261,15 @@ dependencies = [
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"libc",
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]
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[[package]]
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name = "crc32fast"
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version = "1.3.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
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dependencies = [
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"cfg-if",
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]
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[[package]]
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name = "crossbeam"
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version = "0.8.1"
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@ -252,7 +313,7 @@ checksum = "c00d6d2ea26e8b151d99093005cb442fb9a37aeaca582a03ec70946f49ab5ed9"
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dependencies = [
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"cfg-if",
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"crossbeam-utils",
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"lazy_static",
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"lazy_static 1.4.0",
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"memoffset",
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"scopeguard",
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]
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@ -274,7 +335,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b5e5bed1f1c269533fa816a0a5492b3545209a205ca1a54842be180eb63a16a6"
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dependencies = [
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"cfg-if",
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"lazy_static",
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"lazy_static 1.4.0",
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]
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[[package]]
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@ -349,6 +410,57 @@ dependencies = [
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"nohash-hasher",
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]
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[[package]]
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name = "fftw"
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version = "0.7.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9dc6a84bbb6bac64521bfb5a544701ce118f329d550cf9b9054d1954fe61adef"
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dependencies = [
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"bitflags",
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"fftw-sys",
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"lazy_static 1.4.0",
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"ndarray",
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"num-complex",
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"num-traits",
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"thiserror",
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]
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[[package]]
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name = "fftw-src"
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version = "0.3.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c08962470ab0e91e74ec7d338c8731476c28ed4e503a3080b0f001692e395a7c"
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dependencies = [
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"anyhow",
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"cc",
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"fs_extra",
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"ftp",
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"zip",
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]
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[[package]]
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name = "fftw-sys"
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version = "0.6.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e8e3951d695cc2f17610cd041e87ebc15078d1af5eb8c6be77921381fc98b3fd"
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dependencies = [
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"fftw-src",
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"libc",
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"num-complex",
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]
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[[package]]
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name = "flate2"
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version = "1.0.22"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1e6988e897c1c9c485f43b47a529cef42fde0547f9d8d41a7062518f1d8fc53f"
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dependencies = [
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"cfg-if",
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"crc32fast",
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"libc",
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"miniz_oxide",
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]
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[[package]]
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name = "foreign-types"
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version = "0.3.2"
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@ -364,6 +476,23 @@ version = "0.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
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[[package]]
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name = "fs_extra"
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version = "1.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "2022715d62ab30faffd124d40b76f4134a550a87792276512b18d63272333394"
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[[package]]
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name = "ftp"
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version = "3.0.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "542951aad0071952c27409e3bd7cb62d1a3ad419c4e7314106bf994e0083ad5d"
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dependencies = [
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"chrono",
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"lazy_static 0.1.16",
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"regex",
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]
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[[package]]
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name = "gain"
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version = "0.1.0"
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@ -429,6 +558,16 @@ version = "1.0.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
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[[package]]
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name = "kernel32-sys"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
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dependencies = [
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"winapi 0.2.8",
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"winapi-build",
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]
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[[package]]
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name = "keyboard-types"
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version = "0.6.2"
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@ -450,6 +589,12 @@ version = "5.0.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "10257499f089cd156ad82d0a9cd57d9501fa2c989068992a97eb3c27836f206b"
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[[package]]
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name = "lazy_static"
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version = "0.1.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "cf186d1a8aa5f5bee5fd662bc9c1b949e0259e1bcc379d1f006847b0080c7417"
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[[package]]
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name = "lazy_static"
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version = "1.4.0"
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@ -469,7 +614,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "efbc0f03f9a775e9f6aed295c6a1ba2253c5757a9e03d55c6caa46a681abcddd"
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dependencies = [
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"cfg-if",
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"winapi",
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"winapi 0.3.9",
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]
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[[package]]
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"libc",
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]
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[[package]]
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name = "matrixmultiply"
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version = "0.2.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "916806ba0031cd542105d916a97c8572e1fa6dd79c9c51e7eb43a09ec2dd84c1"
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dependencies = [
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"rawpointer",
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]
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[[package]]
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name = "memchr"
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version = "0.1.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
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dependencies = [
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"libc",
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]
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[[package]]
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name = "memchr"
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version = "2.4.1"
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@ -529,6 +692,29 @@ version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
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[[package]]
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name = "miniz_oxide"
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version = "0.4.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a92518e98c078586bc6c934028adcca4c92a53d6a958196de835170a01d84e4b"
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dependencies = [
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"adler",
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"autocfg",
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]
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[[package]]
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name = "ndarray"
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version = "0.14.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6c0d5c9540a691d153064dc47a4db2504587a75eae07bf1d73f7a596ebc73c04"
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dependencies = [
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"matrixmultiply",
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"num-complex",
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"num-integer",
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"num-traits",
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"rawpointer",
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]
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[[package]]
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name = "nih_plug"
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version = "0.0.0"
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"cfg-if",
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"clap-sys",
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"crossbeam",
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"lazy_static",
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"lazy_static 1.4.0",
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"nih_plug_derive",
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"parking_lot",
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"raw-window-handle",
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@ -566,7 +752,7 @@ dependencies = [
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"crossbeam",
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"egui",
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"egui-baseview",
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"lazy_static",
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"lazy_static 1.4.0",
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"nih_plug",
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"parking_lot",
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]
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@ -607,11 +793,61 @@ version = "7.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1b1d11e1ef389c76fe5b81bcaf2ea32cf88b62bc494e19f493d0b30e7a930109"
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dependencies = [
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"memchr",
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"memchr 2.4.1",
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"minimal-lexical",
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"version_check",
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]
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[[package]]
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name = "num"
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version = "0.1.42"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "4703ad64153382334aa8db57c637364c322d3372e097840c72000dabdcf6156e"
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dependencies = [
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"num-integer",
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"num-iter",
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"num-traits",
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]
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[[package]]
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name = "num-complex"
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version = "0.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "747d632c0c558b87dbabbe6a82f3b4ae03720d0646ac5b7b4dae89394be5f2c5"
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dependencies = [
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"num-traits",
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]
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[[package]]
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name = "num-integer"
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version = "0.1.44"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
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dependencies = [
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"autocfg",
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"num-traits",
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]
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[[package]]
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name = "num-iter"
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version = "0.1.42"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b2021c8337a54d21aca0d59a92577a029af9431cb59b909b03252b9c164fad59"
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dependencies = [
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"autocfg",
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"num-integer",
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"num-traits",
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]
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[[package]]
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name = "num-traits"
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version = "0.2.14"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
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dependencies = [
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"autocfg",
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]
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[[package]]
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name = "objc"
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version = "0.2.7"
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@ -706,7 +942,7 @@ version = "0.22.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8533f14c8382aaad0d592c812ac3b826162128b65662331e1127b45c3d18536b"
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dependencies = [
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"memchr",
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"memchr 2.4.1",
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]
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[[package]]
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"cty",
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]
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[[package]]
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name = "rawpointer"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "60a357793950651c4ed0f3f52338f53b2f809f32d83a07f72909fa13e4c6c1e3"
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[[package]]
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name = "redox_syscall"
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version = "0.2.11"
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@ -742,9 +984,28 @@ version = "0.1.3"
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source = "git+https://github.com/nicokoch/reflink?rev=e8d93b465f5d9ad340cd052b64bbc77b8ee107e2#e8d93b465f5d9ad340cd052b64bbc77b8ee107e2"
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dependencies = [
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"libc",
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"winapi",
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"winapi 0.3.9",
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]
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[[package]]
|
||||
name = "regex"
|
||||
version = "0.1.80"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "4fd4ace6a8cf7860714a2c2280d6c1f7e6a413486c13298bbc86fd3da019402f"
|
||||
dependencies = [
|
||||
"aho-corasick",
|
||||
"memchr 0.1.11",
|
||||
"regex-syntax",
|
||||
"thread_local",
|
||||
"utf8-ranges",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "regex-syntax"
|
||||
version = "0.3.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957"
|
||||
|
||||
[[package]]
|
||||
name = "ryu"
|
||||
version = "1.0.9"
|
||||
|
|
@ -835,7 +1096,7 @@ checksum = "1325f292209cee78d5035530932422a30aa4c8fda1a16593ac083c1de211e68a"
|
|||
dependencies = [
|
||||
"bitflags",
|
||||
"dlib",
|
||||
"lazy_static",
|
||||
"lazy_static 1.4.0",
|
||||
"log",
|
||||
"memmap2",
|
||||
"nix",
|
||||
|
|
@ -859,6 +1120,7 @@ dependencies = [
|
|||
name = "stft"
|
||||
version = "0.1.0"
|
||||
dependencies = [
|
||||
"fftw",
|
||||
"nih_plug",
|
||||
]
|
||||
|
||||
|
|
@ -873,6 +1135,55 @@ dependencies = [
|
|||
"unicode-xid",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thiserror"
|
||||
version = "1.0.30"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "854babe52e4df1653706b98fcfc05843010039b406875930a70e4d9644e5c417"
|
||||
dependencies = [
|
||||
"thiserror-impl",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thiserror-impl"
|
||||
version = "1.0.30"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "aa32fd3f627f367fe16f893e2597ae3c05020f8bba2666a4e6ea73d377e5714b"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thread-id"
|
||||
version = "2.0.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a9539db560102d1cef46b8b78ce737ff0bb64e7e18d35b2a5688f7d097d0ff03"
|
||||
dependencies = [
|
||||
"kernel32-sys",
|
||||
"libc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thread_local"
|
||||
version = "0.2.7"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8576dbbfcaef9641452d5cf0df9b0e7eeab7694956dd33bb61515fb8f18cfdd5"
|
||||
dependencies = [
|
||||
"thread-id",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "time"
|
||||
version = "0.1.43"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
|
||||
dependencies = [
|
||||
"libc",
|
||||
"winapi 0.3.9",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "toml"
|
||||
version = "0.5.8"
|
||||
|
|
@ -894,6 +1205,12 @@ version = "0.2.2"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
|
||||
|
||||
[[package]]
|
||||
name = "utf8-ranges"
|
||||
version = "0.1.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
|
||||
|
||||
[[package]]
|
||||
name = "uuid"
|
||||
version = "0.8.2"
|
||||
|
|
@ -1021,7 +1338,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
|
|||
checksum = "d9341df79a8975679188e37dab3889bfa57c44ac2cb6da166f519a81cbe452d4"
|
||||
dependencies = [
|
||||
"dlib",
|
||||
"lazy_static",
|
||||
"lazy_static 1.4.0",
|
||||
"pkg-config",
|
||||
]
|
||||
|
||||
|
|
@ -1031,6 +1348,12 @@ version = "1.0.0-beta.1"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e6f1efe828a707edf85994a4501734ac1c1b9d244cfcf4de235f11c4125ace8f"
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.2.8"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
|
|
@ -1041,6 +1364,12 @@ dependencies = [
|
|||
"winapi-x86_64-pc-windows-gnu",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-build"
|
||||
version = "0.1.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
|
|
@ -1181,3 +1510,17 @@ version = "0.1.0"
|
|||
dependencies = [
|
||||
"nih_plug_xtask",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "zip"
|
||||
version = "0.5.13"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "93ab48844d61251bb3835145c521d88aa4031d7139e8485990f60ca911fa0815"
|
||||
dependencies = [
|
||||
"byteorder",
|
||||
"bzip2",
|
||||
"crc32fast",
|
||||
"flate2",
|
||||
"thiserror",
|
||||
"time",
|
||||
]
|
||||
|
|
|
|||
|
|
@ -10,3 +10,5 @@ crate-type = ["cdylib"]
|
|||
|
||||
[dependencies]
|
||||
nih_plug = { path = "../../../", features = ["assert_process_allocs"] }
|
||||
|
||||
fftw = "0.7.0"
|
||||
|
|
|
|||
|
|
@ -1,3 +1,6 @@
|
|||
use fftw::array::AlignedVec;
|
||||
use fftw::plan::{C2RPlan, C2RPlan32, R2CPlan, R2CPlan32};
|
||||
use fftw::types::{c32, Flag};
|
||||
use nih_plug::prelude::*;
|
||||
use std::pin::Pin;
|
||||
|
||||
|
|
@ -7,25 +10,82 @@ const OVERLAP_TIMES: usize = 4;
|
|||
struct Stft {
|
||||
params: Pin<Box<StftParams>>,
|
||||
|
||||
/// An adapter that performs most of the overlap-add algorithm for us.
|
||||
stft: util::StftHelper,
|
||||
/// A Hann window window, passed to the overlap-add helper.
|
||||
window_function: Vec<f32>,
|
||||
|
||||
/// The FFT of a simple low pass FIR filter.
|
||||
lp_filter_kernel: Vec<c32>,
|
||||
|
||||
/// The algorithms for the FFT and IFFT operations.
|
||||
plan: Plan,
|
||||
/// Scratch buffers for computing our FFT. The [`StftHelper`] already contains a buffer for the
|
||||
/// real values.
|
||||
complex_fft_scratch_buffer: AlignedVec<c32>,
|
||||
}
|
||||
|
||||
/// FFTW uses raw pointers which aren't Send+Sync, so we'll wrap this in a separate struct.
|
||||
struct Plan {
|
||||
r2c_plan: R2CPlan32,
|
||||
c2r_plan: C2RPlan32,
|
||||
}
|
||||
|
||||
unsafe impl Send for Plan {}
|
||||
unsafe impl Sync for Plan {}
|
||||
|
||||
#[derive(Params)]
|
||||
#[allow(clippy::derivable_impls)]
|
||||
struct StftParams {}
|
||||
|
||||
impl Default for Stft {
|
||||
fn default() -> Self {
|
||||
let mut r2c_plan: R2CPlan32 = R2CPlan32::aligned(&[WINDOW_SIZE], Flag::MEASURE).unwrap();
|
||||
let c2r_plan: C2RPlan32 = C2RPlan32::aligned(&[WINDOW_SIZE], Flag::MEASURE).unwrap();
|
||||
let mut real_fft_scratch_buffer: AlignedVec<f32> = AlignedVec::new(WINDOW_SIZE);
|
||||
let mut complex_fft_scratch_buffer: AlignedVec<c32> = AlignedVec::new(WINDOW_SIZE / 2 + 1);
|
||||
|
||||
// Build a super simple low pass filter from one of the built in window function
|
||||
const FILTER_WINDOW_SIZE: usize = 33;
|
||||
let filter_window = util::window::hann(FILTER_WINDOW_SIZE);
|
||||
real_fft_scratch_buffer[0..FILTER_WINDOW_SIZE].copy_from_slice(&filter_window);
|
||||
|
||||
// Our STFT functions will have a window function applied, so we need to do the same thing
|
||||
// with this filter
|
||||
let window_function = util::window::hann(WINDOW_SIZE);
|
||||
util::window::multiply_with_window(&mut real_fft_scratch_buffer, &window_function);
|
||||
|
||||
// And make sure to normalize this so convolution sums to 1
|
||||
let filter_sum_recip = real_fft_scratch_buffer.iter().sum::<f32>().recip();
|
||||
for sample in real_fft_scratch_buffer.as_slice_mut() {
|
||||
*sample *= filter_sum_recip;
|
||||
}
|
||||
|
||||
r2c_plan
|
||||
.r2c(
|
||||
&mut real_fft_scratch_buffer,
|
||||
&mut complex_fft_scratch_buffer,
|
||||
)
|
||||
.unwrap();
|
||||
|
||||
Self {
|
||||
params: Box::pin(StftParams::default()),
|
||||
|
||||
stft: util::StftHelper::new(2, WINDOW_SIZE),
|
||||
window_function: util::window::hann(WINDOW_SIZE),
|
||||
window_function,
|
||||
|
||||
lp_filter_kernel: complex_fft_scratch_buffer
|
||||
.iter()
|
||||
.take(WINDOW_SIZE)
|
||||
.copied()
|
||||
.collect(),
|
||||
|
||||
plan: Plan { r2c_plan, c2r_plan },
|
||||
complex_fft_scratch_buffer,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[allow(clippy::derivable_impls)]
|
||||
impl Default for StftParams {
|
||||
fn default() -> Self {
|
||||
Self {}
|
||||
|
|
@ -73,18 +133,43 @@ impl Plugin for Stft {
|
|||
buffer: &mut Buffer,
|
||||
_context: &mut impl ProcessContext,
|
||||
) -> ProcessStatus {
|
||||
const GAIN_COMPENSATION: f32 = 2.0 / OVERLAP_TIMES as f32;
|
||||
const GAIN_COMPENSATION: f32 = 1.0 / OVERLAP_TIMES as f32 / WINDOW_SIZE as f32;
|
||||
|
||||
self.stft.process_overlap_add(
|
||||
buffer,
|
||||
[],
|
||||
&self.window_function,
|
||||
OVERLAP_TIMES,
|
||||
|_channel_idx, _, block| {
|
||||
for sample in block {
|
||||
// TODO: Use the FFTW bindings and do some STFT operation here instead of
|
||||
// reducing the gain at a 2048 sample latency...
|
||||
*sample *= GAIN_COMPENSATION;
|
||||
|_channel_idx, _, real_fft_scratch_buffer| {
|
||||
// Forward FFT, the helper has already applied window function
|
||||
self.plan
|
||||
.r2c_plan
|
||||
.r2c(
|
||||
real_fft_scratch_buffer,
|
||||
&mut self.complex_fft_scratch_buffer,
|
||||
)
|
||||
.unwrap();
|
||||
|
||||
// As per the convolution theorem we can simply multiply these two buffers. We'll
|
||||
// also apply the gain compensation at this point.
|
||||
for (fft_bin, kernel_bin) in self
|
||||
.complex_fft_scratch_buffer
|
||||
.as_slice_mut()
|
||||
.iter_mut()
|
||||
.zip(&self.lp_filter_kernel)
|
||||
{
|
||||
*fft_bin *= *kernel_bin * GAIN_COMPENSATION;
|
||||
}
|
||||
|
||||
// Inverse FFT back into the scratch buffer. This will be added to a ring buffer
|
||||
// which gets written back to the host at a one block delay.
|
||||
self.plan
|
||||
.c2r_plan
|
||||
.c2r(
|
||||
&mut self.complex_fft_scratch_buffer,
|
||||
real_fft_scratch_buffer,
|
||||
)
|
||||
.unwrap();
|
||||
},
|
||||
);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue