MediaCodec判断是否可以采用硬解码

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import android.media.MediaCodecList;

import java.util.HashMap;
import java.util.Map;

public class VideoSupportUitl {

    private static Map<String, String> codecMap = new HashMap<>();
    static {
        codecMap.put("h264", "video/avc");
    }

    public static String findVideoCodecName(String ffcodename){
        if(codecMap.containsKey(ffcodename))
        {
            return codecMap.get(ffcodename);
        }
        return "";
    }

    public static boolean isSupportCodec(String ffcodecname){
        boolean supportvideo = false;
        int count = MediaCodecList.getCodecCount();
        for(int i = 0; i < count; i++)
        {
            String[] tyeps = MediaCodecList.getCodecInfoAt(i).getSupportedTypes();
            for(int j = 0; j < tyeps.length; j++)
            {
                if(tyeps[j].equals(findVideoCodecName(ffcodecname)))
                {
                    supportvideo = true;
                    break;
                }
            }
            if(supportvideo)
            {
                break;
            }
        }
        return supportvideo;
    }
}

具体的类型对应关系可以查看相关文档，这里在Android源码MediaCodec.createDecoderByType()里面有一些相关的对应支持类型。

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/**
    * Instantiate the preferred decoder supporting input data of the given mime type.
    *
    * The following is a partial list of defined mime types and their semantics:
    * <ul>
    * <li>"video/x-vnd.on2.vp8" - VP8 video (i.e. video in .webm)
    * <li>"video/x-vnd.on2.vp9" - VP9 video (i.e. video in .webm)
    * <li>"video/avc" - H.264/AVC video
    * <li>"video/hevc" - H.265/HEVC video
    * <li>"video/mp4v-es" - MPEG4 video
    * <li>"video/3gpp" - H.263 video
    * <li>"audio/3gpp" - AMR narrowband audio
    * <li>"audio/amr-wb" - AMR wideband audio
    * <li>"audio/mpeg" - MPEG1/2 audio layer III
    * <li>"audio/mp4a-latm" - AAC audio (note, this is raw AAC packets, not packaged in LATM!)
    * <li>"audio/vorbis" - vorbis audio
    * <li>"audio/g711-alaw" - G.711 alaw audio
    * <li>"audio/g711-mlaw" - G.711 ulaw audio
    * </ul>
    *
    * <strong>Note:</strong> It is preferred to use {@link MediaCodecList#findDecoderForFormat}
    * and {@link #createByCodecName} to ensure that the resulting codec can handle a
    * given format.
    *
    * @param type The mime type of the input data.
    * @throws IOException if the codec cannot be created.
    * @throws IllegalArgumentException if type is not a valid mime type.
    * @throws NullPointerException if type is null.
    */
   @NonNull
   public static MediaCodec createDecoderByType(@NonNull String type)
           throws IOException {
       return new MediaCodec(type, true /* nameIsType */, false /* encoder */);
   }

在ffmpeg里面

1
((const AVCodec*)(avCodecContext->codec))->name;

即可拿到name，然后jni交互调用即可。

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