c语言开发摄像头推流软件,Android CameraX 摄像头RTMP推流实现.md

# Android CameraX 摄像头RTMP推流实现

[代码传送门GItHub](https://github.com/kusebingtang/ffmpeg_x264_AVFoundation_Project/tree/main/CameraXAchiveH264)

## CameraX摄像头数据获取

```groovy

def camerax_version = "1.0.0-alpha05"

implementation "androidx.camera:camera-camera2:$camerax_version"

```

权限申请

```css

```

动态权限获取

```java

public boolean checkPermission() {

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(

Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

requestPermissions(new String[]{

Manifest.permission.READ_EXTERNAL_STORAGE,

Manifest.permission.WRITE_EXTERNAL_STORAGE,

Manifest.permission.CAMERA,

Manifest.permission.RECORD_AUDIO

}, 1);

}

return false;

}

```

获取摄像头数据

```java

//子线程中回调

handlerThread = new HandlerThread("Analyze-thread");

handlerThread.start();

CameraX.bindToLifecycle(lifecycleOwner, getPreView(), getAnalysis());

```

```java

private Preview getPreView() {

// 分辨率并不是最终的分辨率，CameraX会自动根据设备的支持情况，结合你的参数，设置一个最为接近的分辨率

PreviewConfig previewConfig = new PreviewConfig.Builder().setTargetResolution(new Size(width, height)).setLensFacing(currentFacing).build();

Preview preview = new Preview(previewConfig);

preview.setOnPreviewOutputUpdateListener(this);

return preview;

}

```

```java

private ImageAnalysis getAnalysis() {

ImageAnalysisConfig imageAnalysisConfig = new ImageAnalysisConfig.Builder()

.setCallbackHandler(new Handler(handlerThread.getLooper()))

.setLensFacing(currentFacing)

.setImageReaderMode(ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE)

.setTargetResolution(new Size(width, height))

.build();

ImageAnalysis imageAnalysis = new ImageAnalysis(imageAnalysisConfig);

imageAnalysis.setAnalyzer(this);

return imageAnalysis;

}

```

数据接收回调方法

```java

@Override

public void analyze(ImageProxy image, int rotationDegrees) {

//图像格式

int format = image.getFormat();

if (format != ImageFormat.YUV_420_888) {

throw new IllegalStateException("根据文档，Camerax图像分析返回的就是YUV420!");

}

}

```

回调数据处理[Android CameraX 摄像头数据ImageProxy数据分析](https://www.jianshu.com/p/b217be3806b3)

### LIBRTMP

C语言开源RTMP库，封装 Socket 建立TCP通信，并实现了RTMP数据的收发。

#### RTMPDump

[rtmpdump](https://links.jianshu.com/go?to=http%3A%2F%2Frtmpdump.mplayerhq.hu%2F) is a toolkit for RTMP streams. All forms of RTMP are supported, including rtmp://, rtmpt://, rtmpe://, rtmpte://, and rtmps://.

License: GPLv2

Copyright (C) 2009 Andrej Stepanchuk

Copyright (C) 2010-2011 Howard Chu

Download the source:

```sh

git clone git://git.ffmpeg.org/rtmpdump

```

The latest release is 2.4 which you can check out from git. Aside from various minor bugfixes since 2.3, RTMPE type 9 handshakes are now supported.

使用第三方库 Rtmpdump 来实现推流到直播服务器，由于 Rtmpdump 的代码量不是很多，我们直接拷贝源代码到 Android 的 cpp 文件

```cmake

#定义宏 如果代码中定义了 #defind NO_CRYPTO

#就表示不适用ssl，不支持rtmps。我们这里不支持ssl

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNO_CRYPTO")

# 把当前目录下所有得文件 变成一个 SOURCE变量表示

aux_source_directory(. SOURCE)

# 编译成librtmp.a 静态库，编译源文件引用${SOURCE}获取

add_library(rtmp STATIC ${SOURCE})

```

工程cmake引入编译好的rtmp静态库

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