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https://github.com/rom1v/sndcpy
Android audio forwarding (scrcpy, but for audio)
https://github.com/rom1v/sndcpy
android audio mirroring scrcpy
Last synced: about 2 months ago
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Android audio forwarding (scrcpy, but for audio)
- Host: GitHub
- URL: https://github.com/rom1v/sndcpy
- Owner: rom1v
- License: mit
- Created: 2020-06-09T19:36:57.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2023-12-06T19:00:29.000Z (10 months ago)
- Last Synced: 2024-06-18T11:32:54.870Z (3 months ago)
- Topics: android, audio, mirroring, scrcpy
- Language: Java
- Homepage:
- Size: 167 KB
- Stars: 3,201
- Watchers: 50
- Forks: 292
- Open Issues: 174
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# sndcpy (v1.1)
This tool forwards audio from an Android 10 device to the computer. It does not
require any _root_ access. It works on _GNU/Linux_, _Windows_ and _macOS_.
The purpose is to enable [audio forwarding][issue14] while mirroring with
[scrcpy]. However, it can be used independently.
**Update: [scrcpy 2.0] now supports audio forwarding natively.**
[issue14]: https://github.com/Genymobile/scrcpy/issues/14
[scrcpy]: https://github.com/Genymobile/scrcpy
[scrcpy 2.0]: https://blog.rom1v.com/2023/03/scrcpy-2-0-with-audio/
## Note
This application is a proof-of-concept. But as explained below, many apps are
restricted and could not forward the audio.
## Requirements
- The Android device requires at least Android 10.
- [VLC] must be installed on the computer.
[vlc]: https://www.videolan.org/
## Get the app
Download the latest release:
- [`sndcpy-v1.1.zip`][release]
SHA-256: `b045320ddddbc5a237d6d95213c664f03b2f46ef8bbfcef91c2d95644ed42bbc`
- [`sndcpy-with-adb-windows-v1.1.zip`][release-adb]
SHA-256: `0b93c846f574df3f38f53eeee44b1a35b863a49465da8f5cd5b1b69a29305901`
_On Windows, for simplicity, take the second archive, which also contains
`adb`._
[release]: https://github.com/rom1v/sndcpy/releases/download/v1.1/sndcpy-v1.1.zip
[release-adb]: https://github.com/rom1v/sndcpy/releases/download/v1.1/sndcpy-with-adb-windows-v1.1.zip
Alternatively, you could [build the app][BUILD].
[BUILD]: BUILD.md
## Run the app
Plug an Android 10 device with USB debugging enabled, and execute:
```bash
./sndcpy
```
If several devices are connected (listed by `adb devices`):
```bash
./sndcpy # replace by the device serial
```
_(omit `./` on Windows)_
It will install the app on the device and start forwarding audio.
Press `Ctrl`+`c` in the terminal to stop (except on Windows, just disconnect the
device or stop capture from the device notifications).
VLC may print this error message once:
```
main stream error: connection error: Connection refused
```
It is "expected", just ignore it.
The sound continues to be played on the device. The volume can be adjusted
independently on the device and on the computer.
## Uninstall
To uninstall the app from the device:
```bash
adb uninstall com.rom1v.sndcpy
```
## Apps restrictions
`sndcpy` may only forward audio from apps which do not prevent audio
capture. The rules are detailed in [§capture policy][rules]:
> - By default, apps that target versions up to and including to Android 9.0 do
> not permit playback capture. To enable it, include
> `android:allowAudioPlaybackCapture="true"` in the app's `manifest.xml` file.
> - By default, apps that target Android 10 (API level 29) or higher allow their
> audio to be captured. To disable playback capture, include
> `android:allowAudioPlaybackCapture="false"` in the app's `manifest.xml`
> file.
So some apps might need to be updated to support audio capture.
[rules]: https://developer.android.com/guide/topics/media/playback-capture#capture_policy
## Audio delay
This is just a proof-of-concept, so it's far from perfect.
For example, jitter may cause VLC to automatically increase its buffering,
causing an unacceptable delay:
```
main input error: ES_OUT_SET_(GROUP_)PCR is called too late (pts_delay increased to 377 ms)
```
In that case, just restart it.
## Environment variables
The scripts [`sndcpy`](sndcpy) and [`sndcpy.bat`](sndcpy.bat) use some default
values which can be overridden by environment variables.
- `ADB`: the full path to the `adb` executable
- `VLC`: the full path to the `vlc` executable
- `SNDCPY_APK`: the full path to `sndcpy.apk`
- `SNDCPY_PORT`: the local port to forward to communicate with the device
## Blog post
- [Audio forwarding on Android 10][blogpost]
[blogpost]: https://blog.rom1v.com/2020/06/audio-forwarding-on-android-10/