jmf를 사용하여 멀티플렉싱 오디오 / 비디오 기록

Question

JMF를 사용하는 프로젝트를 사용하고 짧은 시간 (몇 초에서 2 분까지) 웹 카메라 및 오디오 입력 모두에 대한 레코드를 가져온 다음 결과를 파일에 씁니다.

내 프로젝트의 문제는이 파일이 제대로 생성되지 않고 재생할 수 없습니다.

RTP를 통한 오디오 및 비디오의 다중화 전송 또는 입력 파일의 변환을 수행하는 방법에 대한 수많은 예제를 찾았습니다. 오디오 및 비디오를 캡처하는 작업 예제는 아직 보지 못했습니다.그것을 파일에 씁니다.

누구 든지이 작업을 수행하는 코드의 예가 있습니까?

Answer 1

I've found the reason why I was not able to generate a file from two separate capture devices under JMF, and it relates to ordering of the start commands. In particular, things like Processors will take a datasource, or merging datasource, assign and synchronize the time base(s) and start/stop the sources for you, so the extra work I was trying to do starting the datasources manually is utterly redundant, and throws a wrench in the works.

This was a lot of painful trial and error, and I would suggest you read every line of code, understand the sequencing, and understand what has been included, and what has been left out and why before trying to implement this yourself. JMF is quite the bear if you're not careful.

Oh, and remember to catch exceptions. I had to omit that code due to length restrictions.

Here's my final solution:

public void doRecordingDemo() {

        // Get the default media capture device for audio and video
        DataSource[] sources = new DataSource[2];
        sources[0] = Manager.createDataSource(audioDevice.getLocator());
        sources[1] = Manager.createDataSource(videoDevice.getLocator());

        // Merge the audio and video streams
        DataSource source = Manager.createMergingDataSource(sources);

        // Create a processor to convert from raw format to a file format
        // Notice that we are NOT starting the datasources, but letting the
        //  processor take care of this for us.
        Processor processor = Manager.createProcessor(source);

        // Need a configured processor for this next step
        processor.configure();
        waitForState(processor, Processor.Configured);

        // Modify this to suit your needs, but pay attention to what formats can go in what containers
        processor.setContentDescriptor(new FileTypeDescriptor(FileTypeDescriptor.QUICKTIME));

        // Use the processor to convert the audio and video into reasonable formats and sizes
        // There are probably better ways to do this, but you should NOT make any assumptions
        // about what formats are supported, and instead use a generic method of checking the
        // available formats and sizes.  You have been warned!
        for (TrackControl control : processor.getTrackControls()) {
            if (control.getFormat() instanceof VideoFormat || control.getFormat() instanceof AudioFormat) {
                if (control.getFormat() instanceof AudioFormat) {
                    // In general, this is safe for audio, but do not make assumptions for video.
                    // Things get a little wonky for video because of how complex the options are.
                    control.setFormat(new AudioFormat(AudioFormat.GSM));
                }

                if (control.getFormat() instanceof VideoFormat) {
                    VideoFormat desiredVideoFormat = null;
                    Dimension targetDimension = new Dimension(352, 288);

                    // Search sequentially through this array of formats
                    VideoFormat[] desiredFormats = new VideoFormat[] {new H263Format(), new JPEGFormat(), new RGBFormat(), new YUVFormat()};
                    for (VideoFormat checkFormat : desiredFormats) {
                        // Search the video formats looking for a match.
                        List<VideoFormat> candidates = new LinkedList<VideoFormat>();
                        for (Format format : control.getSupportedFormats()) {
                            if (format.isSameEncoding(checkFormat)) {
                                candidates.add((VideoFormat) format);
                            }
                        }
                        if (!candidates.isEmpty()) {
                            // Get the first candidate for now since we have at least a format match
                            desiredVideoFormat = candidates.get(0);

                            for (VideoFormat format : candidates) {
                                if (targetDimension.equals(format.getSize())) {
                                    // Found exactly what we're looking for
                                    desiredVideoFormat = format;
                                    break;
                                }
                            }
                        }

                        if (desiredVideoFormat != null) {
                            // If we found a match, stop searching formats
                            break;
                        }
                    }

                    if (desiredVideoFormat != null) {
                        // It's entirely possible (but not likely) that we got here without a format
                        //  selected, so this null check is unfortunately necessary.
                        control.setFormat(desiredVideoFormat);
                    }
                }
                control.setEnabled(true);
                System.out.println("Enabled track: " + control + " (" + control.getFormat() + ")");
            }

        }

        // To get the output from a processor, we need it to be realized.
        processor.realize();
        waitForState(processor, Processor.Realized);

        // Get the data output so we can output it to a file.
        DataSource dataOutput = processor.getDataOutput();

        // Create a file to receive the media
        File answerFile = new File("recording.mov");
        MediaLocator dest = new MediaLocator(answerFile.toURI().toURL());

        // Create a data sink to write to the disk
        DataSink answerSink = Manager.createDataSink(dataOutput, dest);

        // Start the processor spinning
        processor.start();

        // Open the file
        answerSink.open();

        // Start writing data
        answerSink.start();

        // SUCCESS!  We are now recording
        Thread.sleep(10000);  // Wait for 10 seconds so we record 10 seconds of video

        try {
            // Stop the processor. This will also stop and close the datasources
            processor.stop();
            processor.close();

            try {
                // Let the buffer run dry.  Event Listeners never seem to get called,
                // so this seems to be the most effective way.
                Thread.sleep(1000);
            } catch (InterruptedException ex) {
                Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
            }

            try {
                // Stop recording to the file.
                answerSink.stop();
            } catch (IOException ex) {
                Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
            }
        } finally {
            try {
                // Whatever else we do, close the file if we can to avoid leaking.
                answerSink.close();
            } catch (Exception ex) {
                Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
            }

            try {
                // Deallocate the native processor resources.
                processor.deallocate();
            } catch (Exception ex) {
                Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
            }
        }
}

// My little utility function to wait for a given state.
private void waitForState(Player player, int state) {
    // Fast abort
    if (player.getState() == state) {
        return;
    }

    long startTime = new Date().getTime();

    long timeout = 10 * 1000;

    final Object waitListener = new Object();

    ControllerListener cl = new ControllerListener() {

        @Override
        public void controllerUpdate(ControllerEvent ce) {
            synchronized (waitListener) {
                waitListener.notifyAll();
            }
        }
    };
    try {
        player.addControllerListener(cl);

        // Make sure we wake up every 500ms to check for timeouts and in case we miss a signal
        synchronized (waitListener) {
            while (player.getState() != state && new Date().getTime() - startTime < timeout) {
                try {
                    waitListener.wait(500);
                } catch (InterruptedException ex) {
                    Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    } finally {
        // No matter what else happens, we want to remove this
        player.removeControllerListener(cl);
    }
}