Enable (n)asm rav1d on Mac & Windows via nasm feature (rerun-io#7694)

### What

Related to
* rerun-io#7671
* rerun-io#7605
* rerun-io#7588

Biting the bullet and split the feature on our rav1d fork:

rerun-io/re_rav1d@emilk/dav1d-interface...rerun-io:rav1d:andreas/disable-asm-linux

Testing done:
* wsl linux release build works now (didn't before)
* windows build still works
    * shows no-asm warning if compiled with out nasm
    * works otherwise
* added a `panic` under `cfg(asm)` in one of the interface functions
(now removed again) .. then:
    * linux still worked
    * windows hit that panic when compiled with nasm feature 

### Checklist
* [x] main ci passes
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested the web demo (if applicable):
* Using examples from latest `main` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7694?manifest_url=https://app.rerun.io/version/main/examples_manifest.json)
* Using full set of examples from `nightly` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7694?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
* [x] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG
* [x] If applicable, add a new check to the [release
checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!
* [x] If have noted any breaking changes to the log API in
`CHANGELOG.md` and the migration guide

- [PR Build Summary](https://build.rerun.io/pr/7694)
- [Recent benchmark results](https://build.rerun.io/graphs/crates.html)
- [Wasm size tracking](https://build.rerun.io/graphs/sizes.html)

To run all checks from `main`, comment on the PR with `@rerun-bot
full-check`.

---------

Co-authored-by: Emil Ernerfeldt <[email protected]>

Cargo.lock

@@ -4758,14 +4758,15 @@ dependencies = [
 [[package]]
 name = "rav1d"
 version = "1.0.0"
-source = "git+https://github.com/rerun-io/rav1d?branch=emilk/dav1d-interface#d3acfb077eac7759f94279ec9a81edd7d0c409ed"
+source = "git+https://github.com/rerun-io/rav1d?rev=a9059f6a02e68cf2aba3795cc370c72f695c4730#a9059f6a02e68cf2aba3795cc370c72f695c4730"
 dependencies = [
  "assert_matches",
  "atomig",
  "av-data",
  "bitflags 2.6.0",
  "cc",
  "cfg-if",
+ "cfg_aliases 0.2.1",
  "libc",
  "nasm-rs",
  "parking_lot",

crates/store/re_video/Cargo.toml

@@ -31,9 +31,11 @@ av1 = ["dep:dav1d"]
 
 ## Enable faster native video decoding with assembly.
 ## You need to install [nasm](https://nasm.us/) to compile with this feature.
-# TODO(#7671): this feature flag currently does nothing
-# nasm = ["dav1d?/default"] # The default feature set of dav1d has asm enabled
-nasm = [] ## TODO(#7671): fix Linux build
+# TODO(#7671): this feature flag currently does nothing on Linux.
+nasm = [
+  # The default feature set of our dav1d fork has asm enabled (except on Linux, see above)
+  "dav1d?/default",
+]
 
 [dependencies]
 re_log.workspace = true
@@ -52,7 +54,7 @@ thiserror.workspace = true
 # If this package fails to build, install `nasm` locally, or build through `pixi`.
 # See https://github.com/rerun-io/rav1d/pull/1
 # TODO(#7588): publish this fork of rav1d
-dav1d = { git = "https://github.com/rerun-io/rav1d", branch = "emilk/dav1d-interface", package = "rav1d", optional = true, default-features = false, features = [
+dav1d = { git = "https://github.com/rerun-io/rav1d", rev = "a9059f6a02e68cf2aba3795cc370c72f695c4730", package = "rav1d", optional = true, default-features = false, features = [
   # We opt-out of wasm features so we don't need  `nasm` installed. It's still pretty fast.
   "bitdepth_8",
 ] }

crates/store/re_video/src/decode/av1.rs

@@ -16,9 +16,9 @@ impl SyncDav1dDecoder {
     pub fn new() -> Result<Self> {
         re_tracing::profile_function!();
 
-        // TODO(#7671): enable this warning again when the `nasm` feature actually does something
+        // TODO(#7671): enable this warning again on Linux when the `nasm` feature actually does something
         #[allow(clippy::overly_complex_bool_expr)]
-        if false && !cfg!(feature = "nasm") {
+        if !cfg!(target_os = "linux") && !cfg!(feature = "nasm") {
             re_log::warn_once!(
                 "NOTE: native AV1 video decoder is running extra slowly. \
                 Speed it up by compiling Rerun with the `nasm` feature enabled. \

crates/top/rerun-cli/Cargo.toml

@@ -43,7 +43,7 @@ default = ["native_viewer", "web_viewer"]
 
 ## Enable faster native video decoding with assembly.
 ## You need to install [nasm](https://nasm.us/) to compile with this feature.
-# TODO(#7671): this feature flag currently does nothing
+# TODO(#7671): this feature flag currently does nothing on linux.
 nasm = ["rerun/nasm"]
 
 ## Support spawning a native viewer.

crates/top/rerun/Cargo.toml

@@ -73,7 +73,7 @@ log = ["dep:env_logger", "dep:log"]
 
 ## Enable faster native video decoding with assembly.
 ## You need to install [nasm](https://nasm.us/) to compile with this feature.
-# TODO(#7671): this feature flag currently does nothing
+# TODO(#7671): this feature flag currently does nothing on linux.
 nasm = ["re_video/nasm"]
 
 ## Support spawning a native viewer.

rerun_py/Cargo.toml

@@ -30,7 +30,7 @@ extension-module = ["pyo3/extension-module"]
 
 ## Enable faster native video decoding with assembly.
 ## You need to install [nasm](https://nasm.us/) to compile with this feature.
-# TODO(#7671): this feature flag currently does nothing
+# TODO(#7671): this feature flag currently does nothing on linux.
 nasm = ["re_video/nasm"]
 
 ## Support serving a web viewer over HTTP with `serve()`.