我怎么知道剩下的时间才能转换成音频文件，用它来显示剩余的内容以便在用户面前下载

问题描述

我从GITHUB获得了这段代码，这对我来说比使用FFmpeg库更好，因为该库至少可以正常工作。发行了24个API，但是我所获得的代码我不知道如何确切地告诉我转换何时完成以及还剩下多少时间，因为这是要显示的转换。在用户面前

@SuppressLint("NewApi")
    public void genVideoUsingmuxer(Context context,String srcPath,String dstPath,int startMs,int endMs,boolean useAudio,boolean useVideo,long time) throws IOException {
        // Set up MediaExtractor to read from the source.
         extractor = new MediaExtractor();
        extractor.setDataSource(srcPath);
        int trackCount = extractor.getTrackCount();
        // Set up Mediamuxer for the destination.

    mediamuxer = new Mediamuxer(dstPath,Mediamuxer.OutputFormat.muxer_OUTPUT_MPEG_4);
    // Set up the tracks and retrieve the max buffer size for selected
    // tracks.
    HashMap<Integer,Integer> indexMap = new HashMap<Integer,Integer>(trackCount);
    int bufferSize = -1;
    for (int i = 0; i < trackCount; i++) {
        MediaFormat format = extractor.getTrackFormat(i);
        String mime = format.getString(MediaFormat.KEY_MIME);
        boolean selectCurrentTrack = false;
        if (mime.startsWith("audio/") && useAudio) {
            selectCurrentTrack = true;
        } else if (mime.startsWith("video/") && useVideo) {
            selectCurrentTrack = true;
        }
        if (selectCurrentTrack) {
            extractor.selectTrack(i);
            int dstIndex = mediamuxer.addTrack(format);
            indexMap.put(i,dstIndex);
            if (format.containsKey(MediaFormat.KEY_MAX_INPUT_SIZE)) {
                int newSize = format.getInteger(MediaFormat.KEY_MAX_INPUT_SIZE);
                bufferSize = newSize > bufferSize ? newSize : bufferSize;
            }
        }
    }
    if (bufferSize < 0) {
        bufferSize = DEFAULT_BUFFER_SIZE;
    }
    // Set up the orientation and starting time for extractor.
    MediaMetadataRetriever retrieverSrc = new MediaMetadataRetriever();
    retrieverSrc.setDataSource(srcPath);
    String degreesString = retrieverSrc.extractMetadata(MediaMetadataRetriever.MetaDATA_KEY_VIDEO_ROTATION);
    if (degreesString != null) {
        int degrees = Integer.parseInt(degreesString);
        if (degrees >= 0) {
            mediamuxer.setorientationHint(degrees);
        }
    }
    if (startMs > 0) {
        extractor.seekTo(startMs * 1000,MediaExtractor.SEEK_TO_CLOSEST_SYNC);
    }
    // copy the samples from MediaExtractor to Mediamediamuxer. We will loop
    // for copying each sample and stop when we get to the end of the source
    // file or exceed the end time of the trimming.
    int offset = 0;
    int trackIndex = -1;
    time = bufferSize;
    ByteBuffer dstBuf = ByteBuffer.allocate(bufferSize);
    mediamuxer.start();
    while (true) {
        bufferInfo.offset = offset;
        bufferInfo.size = extractor.readSampleData(dstBuf,offset);
        if (bufferInfo.size < 0) {
            Log.d(TAG,"Saw input EOS.");
            bufferInfo.size = 0;
            break;
        } else {
            bufferInfo.presentationTimeUs = extractor.getSampleTime();
            if (endMs > 0 && bufferInfo.presentationTimeUs > (endMs * 1000)) {
                Log.d(TAG,"The current sample is over the trim end time.");
                break;
            } else {
                bufferInfo.flags = extractor.getSampleFlags();
                trackIndex = extractor.getSampleTrackIndex();
                mediamuxer.writeSampleData(indexMap.get(trackIndex),dstBuf,bufferInfo);
                extractor.advance();
            }
        }
    }

    mediamuxer.stop();
    mediamuxer.release();

    return;
}

解决方法

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