miracast投屏source和sink端的代码示例

Miracast是一种无线投屏技术，能够将手机、电脑等移动设备上的内容无线传输到支持Miracast协议的显示器上。Miracast技术实现的关键是源端(source)和接收端(sink)的代码。下面我将分别介绍它们的代码示例。

1.源端(source)

Miracast源端主要负责将手机、电脑等设备上的内容编码成视频数据，通过WiFi网络传输到显示器上进行显示。以下是Miracast源端的代码示例：

• 初始化Miracast连接
WiFiP2pManager mManager = (WiFiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
Channel mChannel = mManager.initialize(this, getMainLooper(), null);
• 创建Miracast连接
WifiP2pDevice device = mAdapter.getDevice(position);
mManager.connect(mChannel, config, new ActionListener() {
@Override
public void onSuccess() {
//连接成功后执行的操作
}
@Override
public void onFailure(int reason) {
//连接失败后执行的操作
}
});
• 将手机/电脑上的内容编码成视频流
MediaCodec mMediaCodec = MediaCodec.createEncoderByType(MIME_TYPE);
mMediaCodec.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mMediaCodec.start();
ByteBuffer[] inputBuffers = mMediaCodec.getInputBuffers();
ByteBuffer[] outputBuffers = mMediaCodec.getOutputBuffers();
• 发送视频流
DatagramSocket socket = new DatagramSocket();
InetAddress address = InetAddress.getByName(ipAddress);
DatagramPacket packet = new DatagramPacket(buffer, buffer.length, address, mPort);
socket.send(packet);

2.接收端(sink)

Miracast接收端主要负责接收WiFi网络中传来的视频数据并进行解码和显示。以下是Miracast接收端的代码示例：

• 打开Miracast连接
Intent intent = new Intent("android.settings.MANAGE_ALL_APPLICATIONS_SETTINGS");
intent.setComponent(ComponentName.unflattenFromString(
"com.android.settings/.applications.InstalledAppDetails"));
intent.putExtra("appName", getApplicationInfo().loadLabel(getPackageManager()));
intent.putExtra("packageName", getPackageName());
startActivity(intent);
• 接收视频流
byte[] buffer = new byte[1024];
DatagramSocket socket = new DatagramSocket(port);
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
socket.receive(packet);
• 解码视频流
MediaCodec mMediaCodec = MediaCodec.createDecoderByType(MIME_TYPE);
mMediaCodec.configure(format, mSurface, null, 0);
mMediaCodec.start();
ByteBuffer[] inputBuffers = mMediaCodec.getInputBuffers();
ByteBuffer[] outputBuffers = mMediaCodec.getOutputBuffers();
int inputBufferIndex = mMediaCodec.dequeueInputBuffer(-1);
if (inputBufferIndex >= 0) {
ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
inputBuffer.clear();
inputBuffer.put(packet.getData(), 0, packet.getLength());
mMediaCodec.queueInputBuffer(inputBufferIndex, 0, packet.getLength(), 0, 0);
}
int outputBufferIndex = mMediaCodec.dequeueOutputBuffer(info, TIMEOUT_US);
if (outputBufferIndex >= 0) {
mMediaCodec.releaseOutputBuffer(outputBufferIndex, true);
}

以上就是Miracast投屏source和sink端的代码示例。两端的代码都十分复杂，需要进行深入的学习和研究才能正确地实现Miracast无线投屏。