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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.android.exoplayer2.ext.ffmpeg;
import com.google.android.exoplayer2.util.LibraryLoader;
import com.google.android.exoplayer2.util.MimeTypes;
/**
* This class is based on com.google.android.exoplayer2.ext.ffmpeg.FfmpegLibrary from ExoPlayer2
* in order to support mp2 decoder.
* Configures and queries the underlying native library.
*/
public final class FfmpegLibrary {
private static final LibraryLoader LOADER =
new LibraryLoader("avutil", "avresample", "avcodec", "ffmpeg");
private FfmpegLibrary() {}
/**
* Overrides the names of the FFmpeg native libraries. If an application wishes to call this
* method, it must do so before calling any other method defined by this class, and before
* instantiating a {@link FfmpegAudioRenderer} instance.
*/
public static void setLibraries(String... libraries) {
LOADER.setLibraries(libraries);
}
/**
* Returns whether the underlying library is available, loading it if necessary.
*/
public static boolean isAvailable() {
return LOADER.isAvailable();
}
/**
* Returns the version of the underlying library if available, or null otherwise.
*/
public static String getVersion() {
return isAvailable() ? ffmpegGetVersion() : null;
}
/**
* Returns whether the underlying library supports the specified MIME type.
*/
public static boolean supportsFormat(String mimeType) {
if (!isAvailable()) {
return false;
}
String codecName = getCodecName(mimeType);
return codecName != null && ffmpegHasDecoder(codecName);
}
/**
* Returns the name of the FFmpeg decoder that could be used to decode {@code mimeType}.
*/
/* package */ static String getCodecName(String mimeType) {
switch (mimeType) {
case MimeTypes.AUDIO_MPEG_L2:
return "mp2";
case MimeTypes.AUDIO_AC3:
return "ac3";
default:
return null;
}
}
private static native String ffmpegGetVersion();
private static native boolean ffmpegHasDecoder(String codecName);
}
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