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kimvde 3a5c4277a7 Fix and simplify timestamps handling
Handling of the stream offset and start position was unnecessarily
complex and even incorrect. It was going to be an issue for
concatenation of video and image input.

The stream offset is the offset added before decoding/encoding to
make sure it doesn’t fail in case of negative timestamps (which do
rarely occur).
The start position is equal to the stream offset, plus the clipping
start time if the media is clipped.

Before this change:
- Samples were offset by the start position before decoding, and this
offset was removed before muxing.
- The startPosition of the first MediaItem in a sequence was used for
all the MediaItems in this sequence (which is incorrect).
- The stream offset was removed before applying the GL effects and
added back before encoding so that it was not visible to the OpenGL
processing.

After this change:
- The start position is subtracted in the AssetLoader, so that the
downstream components don’t have to deal with the stream offsets and
start positions.
- Decoded samples with negative timestamps are not passed to the
SamplePipelines. The MediaMuxer doesn’t handle negative timestamps
well. If a stream is 10 secondes long and starts at timestamp -2
seconds, the output will only contain the samples corresponding to the
first 8 (10 - 2) seconds. It won’t contain the last 2 seconds of the
stream. It seems acceptable to remove the first 2 seconds instead.

PiperOrigin-RevId: 520916464
2023-04-05 15:38:27 +01:00
.github/ISSUE_TEMPLATE Remove remaining references to exoplayer.dev 2023-03-30 17:20:36 +00:00
.idea Disable automatic imports for inner classes 2018-07-26 18:27:46 +01:00
demos ...Suppress MissingSuperCall warnings on onBackPressed()... 2023-04-05 15:35:22 +01:00
gradle/wrapper Update the Gradle Wrapper and Android Gradle Plugin 2022-05-30 20:37:12 +00:00
libraries Fix and simplify timestamps handling 2023-04-05 15:38:27 +01:00
.gitignore Add JSyn library build instructions for the MIDI module 2022-09-30 16:25:10 +00:00
api.txt Remove all RawCC references from media3 2023-03-30 17:25:20 +00:00
build.gradle Update the Gradle Wrapper and Android Gradle Plugin 2022-05-30 20:37:12 +00:00
common_library_config.gradle Enfore minCompileSdk version when depending on ExoPlayer/Media3 libs 2022-11-08 11:15:37 +00:00
constants.gradle Bump version numbers to Media3 1.0.0 and ExoPlayer 2.18.5 2023-03-14 16:09:19 +00:00
CONTRIBUTING.md Update docs and READMEs for media3 stable release 2023-03-14 09:16:04 +00:00
core_settings.gradle Create effect module. 2022-08-02 12:36:47 +00:00
gradle.properties Update Gradle jetifier config to use non-deprecated option 2021-07-09 09:07:03 +01:00
gradlew Update the gradle wrapper scripts 2022-03-01 09:34:07 +00:00
gradlew.bat Update the gradle wrapper scripts 2022-03-01 09:34:07 +00:00
javadoc_combined.gradle Remove Dackka integration from media3 gradle files 2023-03-01 17:54:47 +00:00
javadoc_library.gradle Fix search links in generated Javadoc 2021-05-12 13:55:08 +01:00
javadoc_util.gradle Make javadoc links point to Android docs for java.* classes 2020-04-01 22:38:01 +01:00
LICENSE Initial drop. 1.0.10. 2014-06-16 12:56:04 +01:00
lint.xml Enable unstable API errors in the dev guide samples and main demo app 2022-05-09 10:52:57 +01:00
missing_aar_type_workaround.gradle Wrap expression in paranthesis 2022-01-28 08:47:49 +00:00
publish.gradle Add missing } to publish.gradle 2023-01-25 18:46:26 +00:00
README.md Update docs and READMEs for media3 stable release 2023-03-14 09:16:04 +00:00
RELEASENOTES.md Remove mediaTimeOffsetMs from EventDispatcher 2023-04-05 15:34:35 +01:00
SECURITY.md Update security mailing list 2021-11-09 10:09:26 +00:00
settings.gradle Disable publishing block when media3 included in another build. 2022-11-08 11:27:48 +00:00

AndroidX Media

AndroidX Media is a collection of libraries for implementing media use cases on Android, including local playback (via ExoPlayer) 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 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'

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 files depending on AndroidX Media, by adding the following to the android section:

compileOptions {
  targetCompatibility JavaVersion.VERSION_1_8
}

3. Enable multidex

If your Gradle minSdkVersion is 20 or lower, you should enable multidex in order to prevent build errors.

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
cd media

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

gradle.ext.androidxMediaModulePrefix = 'media-'
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 as you would on any other local module, for example:

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

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.