b174bcc173
Issue: #3162 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=165572088
85 lines
3.2 KiB
Markdown
85 lines
3.2 KiB
Markdown
# ExoPlayer Flac extension #
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## Description ##
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The Flac extension provides `FlacExtractor` and `LibflacAudioRenderer`, which
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use libFLAC (the Flac decoding library) to extract and decode FLAC audio.
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## Build instructions ##
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To use this extension you need to clone the ExoPlayer repository and depend on
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its modules locally. Instructions for doing this can be found in ExoPlayer's
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[top level README][].
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In addition, it's necessary to build the extension's native components as
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follows:
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* Set the following environment variables:
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```
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cd "<path to exoplayer checkout>"
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EXOPLAYER_ROOT="$(pwd)"
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FLAC_EXT_PATH="${EXOPLAYER_ROOT}/extensions/flac/src/main"
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```
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* Download the [Android NDK][] and set its location in an environment variable:
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```
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NDK_PATH="<path to Android NDK>"
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```
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* Download and extract flac-1.3.1 as "${FLAC_EXT_PATH}/jni/flac" folder:
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```
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cd "${FLAC_EXT_PATH}/jni" && \
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curl http://downloads.xiph.org/releases/flac/flac-1.3.1.tar.xz | tar xJ && \
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mv flac-1.3.1 flac
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```
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* Build the JNI native libraries from the command line:
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```
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cd "${FLAC_EXT_PATH}"/jni && \
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${NDK_PATH}/ndk-build APP_ABI=all -j4
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```
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[top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md
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[Android NDK]: https://developer.android.com/tools/sdk/ndk/index.html
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## Using the extension ##
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Once you've followed the instructions above to check out, build and depend on
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the extension, the next step is to tell ExoPlayer to use the extractor and/or
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renderer.
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### Using `FlacExtractor` ###
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`FlacExtractor` is used via `ExtractorMediaSource`. If you're using
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`DefaultExtractorsFactory`, `FlacExtractor` will automatically be used to read
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`.flac` files. If you're not using `DefaultExtractorsFactory`, return a
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`FlacExtractor` from your `ExtractorsFactory.createExtractors` implementation.
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### Using `LibflacAudioRenderer` ###
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* If you're passing a `DefaultRenderersFactory` to
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`ExoPlayerFactory.newSimpleInstance`, you can enable using the extension by
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setting the `extensionRendererMode` parameter of the `DefaultRenderersFactory`
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constructor to `EXTENSION_RENDERER_MODE_ON`. This will use
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`LibflacAudioRenderer` for playback if `MediaCodecAudioRenderer` doesn't
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support the input format. Pass `EXTENSION_RENDERER_MODE_PREFER` to give
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`LibflacAudioRenderer` priority over `MediaCodecAudioRenderer`.
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* If you've subclassed `DefaultRenderersFactory`, add a `LibflacAudioRenderer`
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to the output list in `buildAudioRenderers`. ExoPlayer will use the first
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`Renderer` in the list that supports the input media format.
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* If you've implemented your own `RenderersFactory`, return a
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`LibflacAudioRenderer` instance from `createRenderers`. ExoPlayer will use the
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first `Renderer` in the returned array that supports the input media format.
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* If you're using `ExoPlayerFactory.newInstance`, pass a `LibflacAudioRenderer`
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in the array of `Renderer`s. ExoPlayer will use the first `Renderer` in the
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list that supports the input media format.
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Note: These instructions assume you're using `DefaultTrackSelector`. If you have
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a custom track selector the choice of `Renderer` is up to your implementation,
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so you need to make sure you are passing an `LibflacAudioRenderer` to the
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player, then implement your own logic to use the renderer for a given track.
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