mirror of https://github.com/androidx/media.git synced 2025-05-09 08:30:43 +08:00

History

anjalibh 8cad99ba98 Add lightweight dithering to 10->8 bit conversion.

Also optimize / 4 and % 4. I assumed the compiler would do this automatically but the performance bump implies it's not doing that.

           Before | Optimized
No dither: 4.8 ms | 3.5 ms
Dither   : 9.6 ms | 4.2 ms

Before: https://drive.google.com[]file/d/0B07DogHRdEHcaXVobi1wZ2wxeUE/view?usp=sharing
After: https://drive.google.com[]file/d/0B07DogHRdEHcVS1PN05kaU1odm8/view?usp=sharing

Known issue: The remainder from the last Y pixel will leak into the first U pixel. Also U and V remainders leak into each other but I don't think it causes any perceptual difference.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=150255151

2017-03-16 16:10:46 +00:00

src

Add lightweight dithering to 10->8 bit conversion.

2017-03-16 16:10:46 +00:00

build.gradle

Pre-modularization cleanup

2017-03-15 15:44:46 +00:00

proguard-rules.txt

Fix gradle/proguard setup

2017-01-13 17:27:25 +00:00

README.md

extensions/vp9: Fix open source build scripts

2017-03-15 18:51:10 +00:00

README.md

ExoPlayer VP9 Extension

Description

The VP9 Extension is a Renderer implementation that helps you bundle libvpx (the VP9 decoding library) into your app and use it along with ExoPlayer to play VP9 video on Android devices.

Build Instructions

Checkout ExoPlayer along with Extensions:

git clone https://github.com/google/ExoPlayer.git

Set the following environment variables:

cd "<path to exoplayer checkout>"
EXOPLAYER_ROOT="$(pwd)"
VP9_EXT_PATH="${EXOPLAYER_ROOT}/extensions/vp9/src/main"

Download the Android NDK and set its location in an environment variable:

NDK_PATH="<path to Android NDK>"

Fetch libvpx and libyuv:

cd "${VP9_EXT_PATH}/jni" && \
git clone https://chromium.googlesource.com/webm/libvpx libvpx && \
git clone https://chromium.googlesource.com/libyuv/libyuv libyuv

Checkout the appropriate branches of libvpx and libyuv (the scripts and makefiles bundled in this repo are known to work only at these versions of the libraries - we will update this periodically as newer versions of libvpx/libyuv are released):

cd "${VP9_EXT_PATH}/jni/libvpx" && \
git checkout tags/v1.6.1 -b v1.6.1 && \
cd "${VP9_EXT_PATH}/jni/libyuv" && \
git checkout e2611a73

Run a script that generates necessary configuration files for libvpx:

cd ${VP9_EXT_PATH}/jni && \
./generate_libvpx_android_configs.sh "${NDK_PATH}"

Build the JNI native libraries from the command line:

cd "${VP9_EXT_PATH}"/jni && \
${NDK_PATH}/ndk-build APP_ABI=all -j4

In your project, you can add a dependency to the VP9 Extension by using a the following rule:

// in settings.gradle
include ':..:ExoPlayer:library'
include ':..:ExoPlayer:extension-vp9'

// in build.gradle
dependencies {
    compile project(':..:ExoPlayer:library')
    compile project(':..:ExoPlayer:extension-vp9')
}

Now, when you build your app, the VP9 extension will be built and the native libraries will be packaged along with the APK.

Notes

Every time there is a change to the libvpx checkout:
- Android config scripts should be re-generated by running generate_libvpx_android_configs.sh
- Clean and re-build the project.
If you want to use your own version of libvpx or libyuv, place it in ${VP9_EXT_PATH}/jni/libvpx or ${VP9_EXT_PATH}/jni/libyuv respectively. But please note that generate_libvpx_android_configs.sh and the makefiles need to be modified to work with arbitrary versions of libvpx and libyuv.