Implement virtio-snd aaudio stream to support audio in android

This change introduces feature audio_aaudio on top of the support of
virtio-snd-multiple-backend. The android_audio uses the Android
AAudio NDK library to play audio. A libaaudio_stub is provided for
building and testing on non-android environment.

Bug=b:325930215
Test=Play Youtube video on panther
Test=./tools/dev_container
Test=cargo build
Test=cargo build -F audio_aaudio,libaaudio_stub
Test=./tools/run_tests
Test=./tools/presubmit

Change-Id: I7c275433bf94d4a347720ce0ffa9127ffcb66a1e
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5556704
Reviewed-by: Jiyong Park <[email protected]>
Reviewed-by: Frederick Mayle <[email protected]>
Auto-Submit: Mu-Le Lee <[email protected]>
Commit-Queue: Mu-Le Lee <[email protected]>
Reviewed-by: Chih-Yang Hsia <[email protected]>

Cargo.toml

@@ -39,6 +39,7 @@ codegen-units = 1
 members = [
     "aarch64",
     "acpi_tables",
+    "android_audio",
     "arch",
     "argh_helpers",
     "audio_util",
@@ -296,6 +297,13 @@ default-no-sandbox = []
 ## org.chromium.ArcQuota dbus service.
 arc_quota = ["devices/arc_quota"]
 
+## Enables use of Android AAudio virtio-snd backend.
+audio_aaudio = ["devices/audio_aaudio"]
+
+## Stub implementation of Android AAudio NDK library. This is only used for building and testing the
+## Android audio on a non-Android target
+libaaudio_stub = ["android_audio/libaaudio_stub"]
+
 ## Enables use of the ChromeOS audio server. ChromeOS builds will replace libcras_stub with an
 ## implementation that talks to the audio server. In upstream builds, using this option will panic.
 audio_cras = ["devices/audio_cras"]
@@ -367,10 +375,12 @@ all-default = [
 
 ## All features that are compiled and tested for aarch64
 all-aarch64 = [
+    "audio_aaudio",
     "all-default",
     "android_display",
     "android_display_stub",
     "gunyah",
+    "libaaudio_stub",
 ]
 
 ## All features that are compiled and tested for riscv64
@@ -380,9 +390,11 @@ all-riscv64 = [
 
 ## All features that are compiled and tested for x86_64
 all-x86_64 = [
+    "audio_aaudio",
     "all-default",
     "android_display",
     "android_display_stub",
+    "libaaudio_stub",
     "plugin",
     "scudo"
 ]
@@ -484,6 +496,7 @@ aarch64 = { path = "aarch64" }
 minijail = "*" # provided by ebuild
 p9 = "0.2.3"
 vhost = { path = "vhost" }
+android_audio = { path = "android_audio"}
 
 [target.'cfg(windows)'.dependencies]
 anti_tamper = { path = "vendor/generic/anti_tamper" }

android_audio/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "android_audio"
+version = "0.1.0"
+authors = ["The ChromiumOS Authors"]
+edition = "2021"
+
+[features]
+libaaudio_stub = []
+
+[lib]
+path = "src/lib.rs"
+
+[dependencies]
+audio_streams = { path = "../common/audio_streams"}
+async-trait = "0.1.36"
+base = { path = "../base" }
+thiserror = "1.0.20"