Android 播放SMB共享视频

表面上看MediaPlayer只能播放本地和http协议视频。没有直接支持smb://协议。那还能播放smb视频呢?也可以的!

MediaPlayer有一个方法叫:setDataSource(MediaDataSource)。

java 复制代码
    /**
     * Sets the data source (MediaDataSource) to use.
     *
     * @param dataSource the MediaDataSource for the media you want to play
     * @throws IllegalStateException if it is called in an invalid state
     * @throws IllegalArgumentException if dataSource is not a valid MediaDataSource
     */
    public void setDataSource(MediaDataSource dataSource)
            throws IllegalArgumentException, IllegalStateException {
        _setDataSource(dataSource);
    }

我们只要实现MediaDataSource这个接口就可以了。

java 复制代码
/**
 * For supplying media data to the framework. Implement this if your app has
 * special requirements for the way media data is obtained.
 *
 * <p class="note">Methods of this interface may be called on multiple different
 * threads. There will be a thread synchronization point between each call to ensure that
 * modifications to the state of your MediaDataSource are visible to future calls. This means
 * you don't need to do your own synchronization unless you're modifying the
 * MediaDataSource from another thread while it's being used by the framework.</p>
 */
public abstract class MediaDataSource implements Closeable {
    /**
     * Called to request data from the given position.
     *
     * Implementations should fill {@code buffer} with up to {@code size}
     * bytes of data, and return the number of valid bytes in the buffer.
     *
     * Return {@code 0} if size is zero (thus no bytes are read).
     *
     * Return {@code -1} to indicate that end of stream is reached.
     *
     * @param position the position in the data source to read from.
     * @param buffer the buffer to read the data into.
     * @param offset the offset within buffer to read the data into.
     * @param size the number of bytes to read.
     * @throws IOException on fatal errors.
     * @return the number of bytes read, or -1 if end of stream is reached.
     */
    public abstract int readAt(long position, byte[] buffer, int offset, int size)
            throws IOException;

    /**
     * Called to get the size of the data source.
     *
     * @throws IOException on fatal errors
     * @return the size of data source in bytes, or -1 if the size is unknown.
     */
    public abstract long getSize() throws IOException;
}

下面是我实现的代码:

java 复制代码
public class CustomMediaDataSource extends MediaDataSource {
    private static Logger Log4j = Logger.getLogger(CustomMediaDataSource.class);
    private SmbRandomAccessFile mFile; // must not Main UI thread.
    private long mFileSize;

    public CustomMediaDataSource(SmbRandomAccessFile smbFile, long size) throws SmbException {
        this.mFile = smbFile;
        mFileSize = size;
    }

    @Override
    public int readAt(long position, byte[] buffer, int offset, int size) throws IOException {
        if (mFile.getFilePointer() != position)
            mFile.seek(position);

        if (size <= 0)
            return 0;

        Log4j.info("CustomMediaDataSource, readAt, position:" + position);
        return mFile.read(buffer, 0, size);
    }

    @Override
    public long getSize() throws IOException {
        return mFileSize;
    }

    @Override
    public void close() throws IOException {
        mFileSize = 0;
        if (mFile != null) {
            mFile.close();
            mFile = null;
        }
    }
}

这里有一个小插曲, 导致花费了大半天时间。视频播放不能用InputStream接口,要用RandomAccess接口。因为视频播放的数据不是按顺序取的。不然就会报错:java.io.IOException: Prepare failed.: status=0x1。

如果你是其他播放器的, 同样也会有这样的接口提供给你。比如ljkPlayer等。

这个主题值得写一下,网上基本没有讲到。

相关推荐
kaixin_啊啊2 天前
突破限制:Melody远程音频管理新体验
音视频
ai产品老杨2 天前
解锁仓储智能调度、运输路径优化、数据实时追踪,全功能降本提效的智慧物流开源了
javascript·人工智能·开源·音视频·能源
MThinker2 天前
02-Media-8-uvc_with_csc.py 使用硬件解码的USB摄像头(UVC)捕获视频并显示的程序
音视频·智能硬件·micropython·canmv·k230
向阳花开_miemie2 天前
Android音频学习(十八)——混音流程
学习·音视频
清风6666663 天前
基于STM32的APP遥控视频水泵小车设计
stm32·单片机·mongodb·毕业设计·音视频·课程设计
Cary丿Xin3 天前
Luma 视频生成 API 对接说明
音视频
奔跑吧 android3 天前
【车载audio开发】【基础概念1】【音频基础概念通俗讲解】
音视频·channel·audio·aosp·frame·period_size
小狮子安度因4 天前
ffplay音频重采样
ffmpeg·音视频
张晓~183399481214 天前
短视频矩阵源码-视频剪辑+AI智能体开发接入技术分享
c语言·c++·人工智能·矩阵·c#·php·音视频
GilgameshJSS4 天前
【学习K230-例程23】GT6700-音频FFT柱状图
python·学习·音视频