audio_sr_vc_switch

# Audio SR/VC Switching Example

## Overview

This example demonstrates how to create two `audio_recorder` instances in one application:

- one recorder with `AFE_TYPE_SR`
- one recorder with `AFE_TYPE_VC`

Both recorders are opened during startup, but only one route is active at a time. The example switches between them with `audio_recorder_pause()` and `audio_recorder_resume()`.

## Why this example matters

In some products, you need both:

- wakeup capability
- strict quality requirements for post-AEC audio data

One important point is:

- `SR` is usually used for wakeup-related scenarios
- when `SR` runs in wakeup mode, the post-AEC output is often not as good as `VC`

So if your application requires wakeup, but you also care a lot about the quality of the audio after AEC, a practical solution is:

- use `SR` when wakeup is needed
- switch to `VC` when post-AEC audio quality is more important

This example demonstrates exactly that workflow.

## How it works

The example creates two recorder handles:

- `sr`: `AFE_TYPE_SR`, with wakeup enabled
- `vc`: `AFE_TYPE_VC`, without wakeup

Switching is done by pausing one route and resuming the other route, instead of reopening the recorder each time.

## Console commands

After boot, the console prompt is:

```text
sr_vc>
```

Supported commands:

- `rec sr`
- `rec vc`
- `rec pause`
- `rec status`

## Recommendation

If your use case needs wakeup and also has strict requirements on the post-AEC audio result, you can keep both `SR` and `VC` recorders alive and switch between them with `pause` and `resume`.