ijkplayer实现IMediaDataSource

 
由于ijkplayer不能识别android.resource类型的资源在播放raw中的文件的时候用IjkMediaPlayer不能正常播放，实现IMediaDataSource为IjkMediaPlayer提供资源。
 
class RawDataSourceProvider implements IMediaDataSource{
 
    AssetFileDescriptor mDescriptor;
 
    byte[]  mMediaBytes;
 
    long mPosition;
 
    public RawDataSourceProvider(AssetFileDescriptor descriptor) {
        this.mDescriptor = descriptor;
    }
 
    @Override
    public int readAt(long position, byte[] buffer, int offset, int size) throws IOException {
        if(position +  >= mMediaBytes.length){
            return -;
        }
 
        int length;
        if(position + size < mMediaBytes.length){
            length = size;
        }else{
            length = (int) (mMediaBytes.length - position);
            if(length > buffer.length)
                length = buffer.length ;
 
            length--;
        }
 
        System.arraycopy(mMediaBytes, (int) position, buffer, offset, length);
        mPosition = position;
        return length;
    }
 
    @Override
    public long getSize() throws IOException {
        long length  = mDescriptor.getLength();
 
        if(mMediaBytes == null){
            Source source = Okio.source(mDescriptor.createInputStream());
            mMediaBytes = Okio.buffer(source).readByteArray();
        }
 
        return length;
    }
 
    @Override
    public void close() throws IOException {
        if(mDescriptor != null)
            mDescriptor.close();
 
        mDescriptor = null;
        mMediaBytes = null;
    }
}
https://www.cnblogs.com/xwgblog/p/5287151.html