Android usb摄像头录制MP4无预览添加时间水印
时间: 2023-11-12 08:18:56 浏览: 116
要实现在Android设备上使用USB摄像头录制MP4视频并添加时间水印,您需要编写一个应用程序来控制摄像头和添加水印。以下是一些步骤:
1. 在AndroidManifest.xml文件中,添加USB摄像头的权限:
```xml
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.usb.host" />
```
2. 在应用程序中,使用USBManager类来获取连接到设备的USB摄像头:
```java
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
UsbDevice cameraDevice = deviceList.get(deviceName);
```
3. 使用MediaRecorder类来录制视频:
```java
MediaRecorder recorder = new MediaRecorder();
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
recorder.setVideoSize(videoWidth, videoHeight);
recorder.setVideoFrameRate(frameRate);
recorder.setOutputFile(outputFile);
recorder.prepare();
recorder.start();
```
4. 在录制视频的同时,使用Canvas和Paint类来绘制时间水印:
```java
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
paint.setColor(Color.WHITE);
paint.setTextSize(textSize);
canvas.drawText(timeStamp, x, y, paint);
```
5. 将水印添加到视频中:
```java
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(outputFile);
Bitmap videoFrame = retriever.getFrameAtTime();
Canvas canvas = new Canvas(videoFrame);
canvas.drawBitmap(watermarkBitmap, x, y, null);
```
6. 最后,保存带有水印的视频:
```java
FileOutputStream outputStream = new FileOutputStream(outputFile);
videoFrame.compress(Bitmap.CompressFormat.PNG, quality, outputStream);
outputStream.close();
```
以上是大致的流程,您需要根据实际需求进行具体实现和优化。
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