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Update README for Host API tweaks. Fix typos in steps.

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mitchmindtree 2019-06-29 02:58:48 +10:00
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@ -33,7 +33,7 @@ systems, it is most commonly used on Windows to work around limitations of
WASAPI including access to large numbers of channels and lower-latency audio WASAPI including access to large numbers of channels and lower-latency audio
processing. processing.
CPAL allows for using the ASIO SDK as the audio backend on Windows instead of CPAL allows for using the ASIO SDK as the audio host on Windows instead of
WASAPI. To do so, follow these steps: WASAPI. To do so, follow these steps:
1. **Download the ASIO SDK** `.zip` from [this 1. **Download the ASIO SDK** `.zip` from [this
@ -55,7 +55,7 @@ WASAPI. To do so, follow these steps:
``` ```
setx LIBCLANG_PATH "C:\Program Files\LLVM\bin" setx LIBCLANG_PATH "C:\Program Files\LLVM\bin"
``` ```
6. If you don't have any ASIO devices or drivers availabe, you can [**download 6. If you don't have any ASIO devices or drivers available, you can [**download
and install ASIO4ALL**](http://www.asio4all.org/). Be sure to enable the and install ASIO4ALL**](http://www.asio4all.org/). Be sure to enable the
"offline" feature during installation despite what the installer says about "offline" feature during installation despite what the installer says about
it being useless. it being useless.
@ -64,30 +64,24 @@ WASAPI. To do so, follow these steps:
environment variables in the command prompt that we use to build our project. environment variables in the command prompt that we use to build our project.
On 64-bit machines run: On 64-bit machines run:
``` ```
"C:\Program Files (x86)Microsoft Visual Studio 14.0VC\vcvarsall" amd64 "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" amd64
``` ```
On 32-bit machines run: On 32-bit machines run:
``` ```
"C:\Program Files (x86)Microsoft Visual Studio 14.0VC\vcvarsall" x86 "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86
``` ```
8. Select ASIO as the backend at the start of our program with the following 8. Select the ASIO host at the start of our program with the following code:
code:
```rust ```rust
let host;
#[cfg(target_os = "windows")] #[cfg(target_os = "windows")]
{ {
cpal::os::windows::use_asio_backend().expect("Failed to select ASIO backend"); host = cpal::host_from_id(cpal::HostId::Asio).expect("failed to initialise ASIO host");
} }
``` ```
If you run into this error: If you run into an error along the lines of "no variant `Asio` in `HostId`",
make sure that `CPAL_ASIO_DIR` is set correctly and try `cargo clean`.
```
cpal::os::windows::use_asio_backend().expect("Failed to use asio");
^^^^^^^^^^^^^^^^ did you mean `use_wasapi_backend`?
```
Make sure that `CPAL_ASIO_DIR` is set correctly and try `cargo clean`.
In the future we would like to work on automating this process to make it In the future we would like to work on automating this process to make it
easier, but we are not familiar enough with the ASIO license to do so yet. easier, but we are not familiar enough with the ASIO license to do so yet.