tonihei 5e3dcea1bf Ramp up volume after AudioTrack flush to avoid pop sound
AudioTrack doesn't automatically ramp up the volume after a flush
(only when resuming with play after a pause), which causes audible
pop sounds in most cases. The issue can be avoided by manually
applying a short 20ms volume ramp, the same duration used by the
platform for the automatic volume ramping where available.

Together with the already submitted 6147050b90, this fixes the
unwanted pop sounds for most cases in the desired way. It only
leaves two cases that are not handled perfectly:
 - If the media file itself contains a volume ramp at the beginning,
   we wouldn't need this additional ramping. Given the extremely
   short duration, this seems ignorable and we can treat it as a
   future feature request to mark the beginning of media in a special
   way that can then disable the volume ramping.
 - For seamless period transitions where we keep using the same
   AudioTrack, we may still get a pop sound at the transition. To
   solve this, we'd need a dedicated audio processor to either ramp
   the end of media down and the beginning of the next item up, or
   apply a very short cross-fade. Either way, we need new signalling
   to identify cases where the media originates from the same source
   and this effect should not be applied (e.g. when re-concatenating
   clipped audio snippets from the same file).

PiperOrigin-RevId: 676860234
2024-09-20 08:55:29 -07:00
2024-09-19 11:08:06 +02:00
2024-05-07 04:20:55 -07:00
2024-07-24 16:17:00 +01:00
2022-03-01 09:34:07 +00:00
2022-03-01 09:34:07 +00:00
2021-11-09 10:09:26 +00:00

AndroidX Media

AndroidX Media is a collection of libraries for implementing media use cases on Android, including local playback (via ExoPlayer), video editing (via Transformer) and media sessions.

Documentation

Migration for existing ExoPlayer and MediaSession projects

You'll find a migration guide for existing ExoPlayer and MediaSession users on developer.android.com.

API stability

AndroidX Media releases provide API stability guarantees, ensuring that the API surface remains backwards compatible for the most commonly used APIs. APIs intended for more advanced use cases are marked as unstable. To use an unstable method or class without lint warnings, youll need to add the OptIn annotation before using it. For more information see the UnstableApi documentation.

Using the libraries

You can get the libraries from the Google Maven repository. It's also possible to clone this GitHub repository and depend on the modules locally.

From the Google Maven repository

1. Add module dependencies

The easiest way to get started using AndroidX Media is to add gradle dependencies on the libraries you need in the build.gradle.kts file of your app module.

For example, to depend on ExoPlayer with DASH playback support and UI components you can add dependencies on the modules like this:

implementation("androidx.media3:media3-exoplayer:1.X.X")
implementation("androidx.media3:media3-exoplayer-dash:1.X.X")
implementation("androidx.media3:media3-ui:1.X.X")

Or in Gradle Groovy DSL build.gradle:

implementation 'androidx.media3:media3-exoplayer:1.X.X'
implementation 'androidx.media3:media3-exoplayer-dash:1.X.X'
implementation 'androidx.media3:media3-ui:1.X.X'

where 1.X.X is your preferred version. All modules must be the same version.

Please see the AndroidX Media3 developer.android.com page for more information, including a full list of library modules.

This repository includes some modules that depend on external libraries that need to be built manually, and are not available from the Maven repository. Please see the individual READMEs under the libraries directory for more details.

2. Turn on Java 8 support

If not enabled already, you also need to turn on Java 8 support in all build.gradle.kts files depending on AndroidX Media, by adding the following to the android section:

compileOptions {
  targetCompatibility = JavaVersion.VERSION_1_8
}

Or in Gradle Groovy DSL build.gradle:

compileOptions {
  targetCompatibility JavaVersion.VERSION_1_8
}

Locally

Cloning the repository and depending on the modules locally is required when using some libraries. It's also a suitable approach if you want to make local changes, or if you want to use the main branch.

First, clone the repository into a local directory:

git clone https://github.com/androidx/media.git

Next, add the following to your project's settings.gradle.kts file, replacing path/to/media with the path to your local copy:

(gradle as ExtensionAware).extra["androidxMediaModulePrefix"] = "media3-"
apply(from = file("path/to/media/core_settings.gradle"))

Or in Gradle Groovy DSL settings.gradle:

gradle.ext.androidxMediaModulePrefix = 'media3-'
apply from: file("path/to/media/core_settings.gradle")

You should now see the AndroidX Media modules appear as part of your project. You can depend on them from build.gradle.kts as you would on any other local module, for example:

implementation(project(":media3-lib-exoplayer"))
implementation(project(":media3-lib-exoplayer-dash"))
implementation(project(":media3-lib-ui"))

Or in Gradle Groovy DSL build.gradle:

implementation project(':media3-lib-exoplayer')
implementation project(':media3-lib-exoplayer-dash')
implementation project(':media3-lib-ui')

MIDI module

By default the MIDI module is disabled as a local dependency, because it requires additional Maven repository config. If you want to use it as a local dependency, please configure the JitPack repository as described in the module README, and then enable building the module in your settings.gradle.kts file:

gradle.extra.apply {
  set("androidxMediaEnableMidiModule", true)
}

Or in Gradle Groovy DSL settings.gradle:

gradle.ext.androidxMediaEnableMidiModule = true

Developing AndroidX Media

Project branches

Development work happens on the main branch. Pull requests should normally be made to this branch.

The release branch holds the most recent stable release.

Using Android Studio

To develop AndroidX Media using Android Studio, simply open the project in the root directory of this repository.

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