Working audio input selector. Doesn't actually store the state anywhere yet.

Cargo.lock

@@ -8,6 +8,37 @@ version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "512761e0bb2578dd7380c6baaa0f4ce03e84f95e960231d1dec8bf4d7d6e2627"
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "alsa"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed7572b7ba83a31e20d1b48970ee402d2e3e0537dcfe0a3ff4d6eb7508617d43"
+dependencies = [
+ "alsa-sys",
+ "bitflags 2.6.0",
+ "cfg-if",
+ "libc",
+]
+
+[[package]]
+name = "alsa-sys"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db8fee663d06c4e303404ef5f40488a53e062f89ba8bfed81f42325aafad1527"
+dependencies = [
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "android-tzdata"
 version = "0.1.1"
@@ -29,6 +60,24 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
+[[package]]
+name = "bindgen"
+version = "0.70.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f49d8fed880d473ea71efb9bf597651e77201bdd4893efe54c9e5d65ae04ce6f"
+dependencies = [
+ "bitflags 2.6.0",
+ "cexpr",
+ "clang-sys",
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "rustc-hash",
+ "shlex",
+ "syn",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -59,6 +108,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "bytes"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ac0150caa2ae65ca5bd83f25c7de183dea78d4d366469f148435e2acfbad0da"
+
 [[package]]
 name = "cairo"
 version = "0.0.4"
@@ -98,9 +153,26 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1aeb932158bd710538c73702db6945cb68a8fb08c519e6e12706b94263b36db8"
 dependencies = [
+ "jobserver",
+ "libc",
  "shlex",
 ]
 
+[[package]]
+name = "cesu8"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d43a04d8753f35258c91f8ec639f792891f748a1edbd759cf1dcea3382ad83c"
+
+[[package]]
+name = "cexpr"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "cfg-expr"
 version = "0.17.0"
@@ -131,12 +203,33 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
+[[package]]
+name = "clang-sys"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b023947811758c97c59bf9d1c188fd619ad4718dcaa767947df1cadb14f39f4"
+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
 [[package]]
 name = "color_quant"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
 
+[[package]]
+name = "combine"
+version = "4.6.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba5a308b75df32fe02788e748662718f03fde005016435c444eea572398219fd"
+dependencies = [
+ "bytes",
+ "memchr",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
@@ -189,6 +282,49 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "coreaudio-rs"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "321077172d79c662f64f5071a03120748d5bb652f5231570141be24cfcd2bace"
+dependencies = [
+ "bitflags 1.3.2",
+ "core-foundation-sys",
+ "coreaudio-sys",
+]
+
+[[package]]
+name = "coreaudio-sys"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2ce857aa0b77d77287acc1ac3e37a05a8c95a2af3647d23b15f263bdaeb7562b"
+dependencies = [
+ "bindgen",
+]
+
+[[package]]
+name = "cpal"
+version = "0.15.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "873dab07c8f743075e57f524c583985fbaf745602acbe916a01539364369a779"
+dependencies = [
+ "alsa",
+ "core-foundation-sys",
+ "coreaudio-rs",
+ "dasp_sample",
+ "jni",
+ "js-sys",
+ "libc",
+ "mach2",
+ "ndk",
+ "ndk-context",
+ "oboe",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "windows",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.4.2"
@@ -198,6 +334,12 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "dasp_sample"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c87e182de0887fd5361989c677c4e8f5000cd9491d6d563161a8f3a5519fc7f"
+
 [[package]]
 name = "dirs"
 version = "5.0.1"
@@ -240,6 +382,12 @@ dependencies = [
  "wio",
 ]
 
+[[package]]
+name = "either"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
+
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -260,6 +408,7 @@ name = "fft2midi"
 version = "0.1.0"
 dependencies = [
  "cairo",
+ "cpal",
  "gdk-pixbuf",
  "gtk4",
  "libadwaita",
@@ -576,6 +725,12 @@ dependencies = [
  "system-deps",
 ]
 
+[[package]]
+name = "glob"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"
+
 [[package]]
 name = "gobject-sys"
 version = "0.20.4"
@@ -716,7 +871,7 @@ dependencies = [
  "iana-time-zone-haiku",
  "js-sys",
  "wasm-bindgen",
- "windows-core",
+ "windows-core 0.52.0",
 ]
 
 [[package]]
@@ -752,6 +907,46 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "413ee7dfc52ee1a4949ceeb7dbc8a33f2d6c088194d9f922fb8318faf1f01186"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "jni"
+version = "0.21.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a87aa2bb7d2af34197c04845522473242e1aa17c12f4935d5856491a7fb8c97"
+dependencies = [
+ "cesu8",
+ "cfg-if",
+ "combine",
+ "jni-sys",
+ "log",
+ "thiserror",
+ "walkdir",
+ "windows-sys 0.45.0",
+]
+
+[[package]]
+name = "jni-sys"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8eaf4bc02d17cbdd7ff4c7438cafcdf7fb9a4613313ad11b4f8fefe7d3fa0130"
+
+[[package]]
+name = "jobserver"
+version = "0.1.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48d1dbcbbeb6a7fec7e059840aa538bd62aaccf972c7346c4d9d2059312853d0"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "jpeg-decoder"
 version = "0.3.1"
@@ -836,6 +1031,15 @@ version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
+[[package]]
+name = "mach2"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b955cdeb2a02b9117f121ce63aa52d08ade45de53e48fe6a38b39c10f6f709"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.4"
@@ -851,6 +1055,12 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.8.0"
@@ -861,6 +1071,45 @@ dependencies = [
  "simd-adler32",
 ]
 
+[[package]]
+name = "ndk"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2076a31b7010b17a38c01907c45b945e8f11495ee4dd588309718901b1f7a5b7"
+dependencies = [
+ "bitflags 2.6.0",
+ "jni-sys",
+ "log",
+ "ndk-sys",
+ "num_enum",
+ "thiserror",
+]
+
+[[package]]
+name = "ndk-context"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27b02d87554356db9e9a873add8782d4ea6e3e58ea071a9adb9a2e8ddb884a8b"
+
+[[package]]
+name = "ndk-sys"
+version = "0.5.0+25.2.9519653"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c196769dd60fd4f363e11d948139556a344e79d451aeb2fa2fd040738ef7691"
+dependencies = [
+ "jni-sys",
+]
+
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "num"
 version = "0.1.42"
@@ -897,6 +1146,17 @@ dependencies = [
  "rustc-serialize",
 ]
 
+[[package]]
+name = "num-derive"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed3955f1a9c7c0c15e092f9c887db08b1fc683305fdf6eb6684f22555355e202"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "num-integer"
 version = "0.1.46"
@@ -938,6 +1198,50 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "num_enum"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e613fc340b2220f734a8595782c551f1250e969d87d3be1ae0579e8d4065179"
+dependencies = [
+ "num_enum_derive",
+]
+
+[[package]]
+name = "num_enum_derive"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af1844ef2428cc3e1cb900be36181049ef3d3193c63e43026cfe202983b27a56"
+dependencies = [
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "oboe"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8b61bebd49e5d43f5f8cc7ee2891c16e0f41ec7954d36bcb6c14c5e0de867fb"
+dependencies = [
+ "jni",
+ "ndk",
+ "ndk-context",
+ "num-derive",
+ "num-traits",
+ "oboe-sys",
+]
+
+[[package]]
+name = "oboe-sys"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c8bb09a4a2b1d668170cfe0a7d5bc103f8999fb316c98099b6a9939c9f2e79d"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.20.2"
@@ -1145,6 +1449,41 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
+
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "rustc-serialize"
 version = "0.3.25"
@@ -1375,6 +1714,18 @@ dependencies = [
  "wasm-bindgen-shared",
 ]
 
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc7ec4f8827a71586374db3e87abdb5a2bb3a15afed140221307c3ec06b1f63b"
+dependencies = [
+ "cfg-if",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
 [[package]]
 name = "wasm-bindgen-macro"
 version = "0.2.95"
@@ -1451,6 +1802,16 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows"
+version = "0.54.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9252e5725dbed82865af151df558e754e4a3c2c30818359eb17465f1346a1b49"
+dependencies = [
+ "windows-core 0.54.0",
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "windows-core"
 version = "0.52.0"
@@ -1460,6 +1821,34 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
+[[package]]
+name = "windows-core"
+version = "0.54.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12661b9c89351d684a50a8a643ce5f608e20243b9fb84687800163429f161d65"
+dependencies = [
+ "windows-result",
+ "windows-targets 0.52.6",
+]
+
+[[package]]
+name = "windows-result"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e383302e8ec8515204254685643de10811af0ed97ea37210dc26fb0032647f8"
+dependencies = [
+ "windows-targets 0.52.6",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.45.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
+dependencies = [
+ "windows-targets 0.42.2",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
@@ -1478,6 +1867,21 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
+[[package]]
+name = "windows-targets"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
+dependencies = [
+ "windows_aarch64_gnullvm 0.42.2",
+ "windows_aarch64_msvc 0.42.2",
+ "windows_i686_gnu 0.42.2",
+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
+ "windows_x86_64_msvc 0.42.2",
+]
+
 [[package]]
 name = "windows-targets"
 version = "0.48.5"
@@ -1509,6 +1913,12 @@ dependencies = [
  "windows_x86_64_msvc 0.52.6",
 ]
 
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
+
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.48.5"
@@ -1521,6 +1931,12 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
 
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
+
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.48.5"
@@ -1533,6 +1949,12 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
 
+[[package]]
+name = "windows_i686_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
+
 [[package]]
 name = "windows_i686_gnu"
 version = "0.48.5"
@@ -1551,6 +1973,12 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
 
+[[package]]
+name = "windows_i686_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
@@ -1563,6 +1991,12 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
@@ -1575,6 +2009,12 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
@@ -1587,6 +2027,12 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"

Cargo.toml

@@ -9,3 +9,4 @@ gdk-pixbuf = "0.20.4"
 gtk = { version = "0.9.4", package = "gtk4", features = ["v4_12", "gnome_47"] }
 adw = { package = "libadwaita", version = "0.7.1", features = ["v1_6"] }
 plotters = "0.3.7"
+cpal = "*"

README.md

@@ -5,4 +5,4 @@ Libraries used:
 https://gtk-rs.org/gtk4-rs/git/book/hello_world.html <br>
 https://docs.rs/rustfft/latest/rustfft/ <br>
 https://docs.rs/crate/midir/latest <br>
-https://pipewire.pages.freedesktop.org/pipewire-rs/pipewire/
+https://docs.rs/cpal/latest/cpal/

src/audio_processor.rs

@@ -0,0 +1,13 @@
+use cpal::traits::HostTrait;
+
+pub struct AudioProcessor {
+    //selected_input_device: usize;
+}
+
+impl AudioProcessor {
+    fn new() -> AudioProcessor {
+        AudioProcessor {
+      //      selected_input_device: cpal::
+        }
+    }
+}

src/main.rs

@@ -1,6 +1,9 @@
+use cpal::traits::{DeviceTrait, HostTrait};
 use gtk::prelude::*;
 use gtk::{self, glib, Application};
+
 mod graph_widget;
+mod audio_processor;
 
 const APP_ID: &str = "com.chloechristine.ftt2midi";
 
@@ -33,10 +36,18 @@ fn build_ui(app: &Application) {
     .object::<gtk::MenuButton>("input_selector")
     .expect("Couldn't bind to input_selector");
 
+    let input_selector_dropdown = builder
+    .object::<gtk::PopoverMenu>("input_selector_dropdown")
+    .expect("Couldn't bind to input_selector_dropdown");
+
     let midi_device_selector = builder
     .object::<gtk::MenuButton>("midi_device_selector")
     .expect("Couldn't bind to midi_device_selector");
 
+    let midi_device_selector_dropdown = builder
+    .object::<gtk::PopoverMenu>("midi_device_selector_dropdown")
+    .expect("Couldn't bind to midi_device_selector_dropdown");
+
     let start_button = builder
     .object::<gtk::Button>("start_button")
     .expect("Couldn't bind to start_button");
@@ -45,11 +56,41 @@ fn build_ui(app: &Application) {
     fft_graph.set_height_request(500);
     fft_graph.set_width_request(500);
     main_grid.attach(&fft_graph, 0, 0, 1, 1);
-    //main_grid.attach_next_to(&fft_graph, Some(&control_deck), gtk::PositionType::Top, 1, 0);
+
+    input_selector_dropdown.connect_show(move |input_selector_dropdown: &gtk::PopoverMenu| {
+        // Get audio interfaces and populate the menu
+        println!("Input selector opened");
+        let hosts = cpal::available_hosts();
+        // Build a list of input devices and populate the menu
+        let device_list_grid = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .build();
+        for host_id in hosts {
+            let host = cpal::host_from_id(host_id).expect("Failed to get host");
+            match host.input_devices() {
+                Ok(devices) => {
+                    let default_button = gtk::Button::with_label("None Selected");
+                    default_button.connect_clicked(move |_| {
+                        println!("{} {}", -1, "None Selected");
+                    });
+                    device_list_grid.append(&default_button);
+                    for (index, device) in devices.enumerate() {
+                        let label = format!("{}", device.name().unwrap());
+                        println!("{}", label);
+                        let selection_button = gtk::Button::with_label(label.as_str());
+                        selection_button.connect_clicked(move |_| {
+                            println!("{} {}", index, label);
+                        });
+                        device_list_grid.append(&selection_button);
+                    }
+                }
+                Err(err) => eprintln!("Error printing input devices: {:?}", err),
+            }
+        };
+        input_selector_dropdown.set_child(Some(&device_list_grid));
+    });
 
     //start_button.connect_clicked()
-
-
     window.set_application(Some(app));
 
     // Present the window

src/resources/main_window.cmb

@@ -16,8 +16,8 @@
 	(1,7,"GtkMenuButton","midi_device_selector",3,None,None,None,3,None,None),
 	(1,8,"GtkButton","start_button",3,None,None,None,4,None,None),
 	(1,9,"GtkGrid","main_grid",1,None,None,None,0,None,None),
-	(1,10,"GtkPopoverMenu",None,7,None,None,None,0,None,None),
+	(1,10,"GtkPopoverMenu","midi_device_selector_dropdown",7,None,None,None,0,None,None),
-	(1,11,"GtkPopoverMenu",None,6,None,None,None,0,None,None)
+	(1,11,"GtkPopoverMenu","input_selector_dropdown",6,None,None,None,0,None,None)
   </object>
   <object_property>
 	(1,1,"GtkApplicationWindow","show-menubar","True",None,None,None,None,None,None,None,None,None),
@@ -31,10 +31,14 @@
 	(1,5,"GtkWidget","margin-start","20",None,None,None,None,None,None,None,None,None),
 	(1,6,"GtkMenuButton","active","True",None,None,None,None,None,None,None,None,None),
 	(1,6,"GtkMenuButton","always-show-arrow","True",None,None,None,None,None,None,None,None,None),
+	(1,6,"GtkMenuButton","direction","right",None,None,None,None,None,None,None,None,None),
 	(1,6,"GtkMenuButton","icon-name","multimedia-volume-control",None,None,None,None,None,None,None,None,None),
+	(1,6,"GtkMenuButton","label","None Selected",None,None,None,None,None,None,None,None,None),
 	(1,6,"GtkMenuButton","popover",None,None,None,None,None,11,None,None,None,None),
 	(1,7,"GtkMenuButton","active","True",None,None,None,None,None,None,None,None,None),
 	(1,7,"GtkMenuButton","always-show-arrow","True",None,None,None,None,None,None,None,None,None),
+	(1,7,"GtkMenuButton","direction","right",None,None,None,None,None,None,None,None,None),
+	(1,7,"GtkMenuButton","label","None Selected",None,None,None,None,None,None,None,None,None),
 	(1,7,"GtkMenuButton","popover",None,None,None,None,None,10,None,None,None,None),
 	(1,8,"GtkButton","label","Start",None,None,None,None,None,None,None,None,None),
 	(1,8,"GtkWidget","can-target","False",None,None,None,None,None,None,None,None,None),
@@ -44,7 +48,8 @@
 	(1,9,"GtkWidget","hexpand-set","True",None,None,None,None,None,None,None,None,None),
 	(1,9,"GtkWidget","valign","baseline-center",None,None,None,None,None,None,None,None,None),
 	(1,9,"GtkWidget","vexpand","True",None,None,None,None,None,None,None,None,None),
-	(1,9,"GtkWidget","vexpand-set","True",None,None,None,None,None,None,None,None,None)
+	(1,9,"GtkWidget","vexpand-set","True",None,None,None,None,None,None,None,None,None),
+	(1,10,"GtkPopover","position","right",None,None,None,None,None,None,None,None,None)
   </object_property>
   <object_layout_property>
 	(1,3,4,"GtkGridLayoutChild","column","0",None,None,None,None),

src/resources/main_window.ui

@@ -48,9 +48,11 @@
               <object class="GtkMenuButton" id="input_selector">
                 <property name="active">True</property>
                 <property name="always-show-arrow">True</property>
+                <property name="direction">right</property>
                 <property name="icon-name">multimedia-volume-control</property>
+                <property name="label">None Selected</property>
                 <property name="popover">
-                  <object class="GtkPopoverMenu"/>
+                  <object class="GtkPopoverMenu" id="input_selector_dropdown"/>
                 </property>
                 <layout>
                   <property name="column">1</property>
@@ -64,8 +66,12 @@
               <object class="GtkMenuButton" id="midi_device_selector">
                 <property name="active">True</property>
                 <property name="always-show-arrow">True</property>
+                <property name="direction">right</property>
+                <property name="label">None Selected</property>
                 <property name="popover">
-                  <object class="GtkPopoverMenu"/>
+                  <object class="GtkPopoverMenu" id="midi_device_selector_dropdown">
+                    <property name="position">right</property>
+                  </object>
                 </property>
                 <layout>
                   <property name="column">1</property>