ScreenRecorder 代码解读

Reference


MyApplication

加载screenrecorderrtmpJNI库;保存 Context。

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public class MyApplication extends Application {
static {
System.loadLibrary("screenrecorderrtmp");
}
private static Context context;
@Override
public void onCreate() {
super.onCreate();
context = getApplicationContext();
}
public static Context getContext() {
return context;
}
}

LaunchActivity

获取权限;设置按钮点击后跳转到屏幕捕捉界面或相机捕捉界面。

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public class LaunchActivity extends AppCompatActivity {
private static final int REQUEST_CODE_STREAM = 1;
private static String[] PERMISSIONS_STREAM = {
Manifest.permission.CAMERA,
Manifest.permission.RECORD_AUDIO,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
@BindView(R.id.btn_screen_record)
Button btnScreenRecord;
@BindView(R.id.btn_camera_record)
Button btnCameraRecord;
boolean authorized = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_launch);
ButterKnife.bind(this);
verifyPermissions();
}
@OnClick({R.id.btn_screen_record, R.id.btn_camera_record})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.btn_screen_record:
ScreenRecordActivity.launchActivity(this);
break;
case R.id.btn_camera_record:
CameraActivity.launchActivity(this);
break;
}
}
public void verifyPermissions() {
int CAMERA_permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA);
int RECORD_AUDIO_permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
int WRITE_EXTERNAL_STORAGE_permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (CAMERA_permission != PackageManager.PERMISSION_GRANTED
|| RECORD_AUDIO_permission != PackageManager.PERMISSION_GRANTED
|| WRITE_EXTERNAL_STORAGE_permission != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, PERMISSIONS_STREAM, REQUEST_CODE_STREAM);
authorized = false;
} else {
authorized = true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_CODE_STREAM) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED
&& grantResults[2] == PackageManager.PERMISSION_GRANTED) {
authorized = true;
}
}
}
}

ScreenRecordListenerService

通知开始屏幕捕捉;监听推流进度。

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@SuppressLint("LongLogTag")
public class ScreenRecordListenerService extends Service {
private static final String TAG = "ScreenRecordListenerService";
public static final int REQUEST_CODE_PENDING = 0x01;
private static final int NOTIFICATION_ID = 3;
private NotificationManager notificationManager;
private NotificationCompat.Builder builder;
private IScreenRecorderAidlInterface.Stub binder = new IScreenRecorderAidlInterface.Stub() {
@Override
public void startScreenRecord(Intent bundleData) throws RemoteException {
}
@Override
public void sendDanmaku(List<DanmakuBean> danmakuBeanList) throws RemoteException {
Log.d(TAG, "danmaku msg: " + danmakuBeanList.get(0).getMessage());
}
};
@Override
public void onCreate() {
super.onCreate();
initNotification();
}
@Override
public IBinder onBind(Intent intent) {
return binder;
}
@Override
public void onDestroy() {
super.onDestroy();
if (notificationManager != null) {
notificationManager.cancel(NOTIFICATION_ID);
}
}
private void initNotification() {
builder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(getResources().getString(R.string.app_name))
.setContentText("您正在录制视频内容哦")
.setOngoing(true)
.setDefaults(Notification.DEFAULT_VIBRATE);
Intent intent = new Intent(this, ScreenRecordActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, REQUEST_CODE_PENDING, intent, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(pendingIntent);
notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(NOTIFICATION_ID, builder.build());
}
}

Packager

AvcPackager

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public static class AvcPackager {
public static byte[] generateAvcDecoderConfigurationRecord(MediaFormat mediaFormat) {
// 获取 csd-0 缓冲区的值,该值对应 SPS;csd-1 对应 PPS
ByteBuffer spsByteBuff = mediaFormat.getByteBuffer("csd-0");
ByteBuffer ppsByteBuff = mediaFormat.getByteBuffer("csd-1");
// 跳过 4 个字节
spsByteBuff.position(4);
ppsByteBuff.position(4);
// 获取缓冲区剩余字节数
int spsLength = spsByteBuff.remaining();
int ppsLength = ppsByteBuff.remaining();
// 11 字节包括:
// configurationVersion(1 字节)、
// AVCProfileIndication(1 字节)、
// profile_compatibility(1 字节)、
// AVCLevelIndication(1 字节)、
// 6bit的reserved + 2bit的lengthSizeMinusOne(1 字节)、
// 3bit的reserved + 5bit的numOfSequenceParameterSets(1 字节)、
// SPS 的长度(2 字节)、
// numOfPictureParameterSets(1 字节)、
// PPS 的长度(2 字节)
int length = 11 + spsLength + ppsLength;
byte[] result = new byte[length];
// 从 result 数组第 9 位开始放置 spsByteBuff,一直放置完
spsByteBuff.get(result, 8, spsLength);
// 从 result 数组第 9+spsLength+3 位开始放置 ppsByteBuff,一直放置完
ppsByteBuff.get(result, 8 + spsLength + 3, ppsLength);
result[0] = (byte) 0x01;// configurationVersion,实际测试时发现总为0x01
result[1] = result[9];// AVCProfileIndication
result[2] = result[10];// profile_compatibility
result[3] = result[11];// AVCLevelIndication
result[4] = (byte) 0xFF;// 6bit的reserved + 2bit的lengthSizeMinusOne,实际测试时发现总为0xff
result[5] = (byte) 0xE1;// 3bit的reserved + 5bit的numOfSequenceParameterSets,实际测试时发现总为0xe1
// result 数组第 7 位放置 spsLength 的高 8 位
// result 数组第 8 位放置 spsLength 的低 8 位
ByteArrayTools.intToTwoByteArray(result, 6, spsLength);
int pos = 8 + spsLength;
result[pos] = (byte) 0x01;// numOfPictureParameterSets,实际测试时发现总为0x01
// result 数组第 8+spsLength+1 位放置 ppsLength 的高 8 位
// result 数组第 8+spsLength+2 位放置 ppsLength 的低 8 位
ByteArrayTools.intToTwoByteArray(result, pos + 1, ppsLength);
return result;
}
}

generateAvcDecoderConfigurationRecord(MediaFormat mediaFormat)

FLV要求的AVCAVCDecoderConfigurationRecord格式编码。

其中可以看到AVC格式的SPSPPS分别对应csd-0csd-1

FlvPackager

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public static class FlvPackager {
public static final int FLV_TAG_HEADER_LENGTH = 11;
public static final int FLV_VIDEO_TAG_HEADER_LENGTH = 5;
public static final int FLV_AUDIO_TAG_HEADER_LENGTH = 2;
public static final int FLV_TAG_FOOTER_LENGTH = 4;
public static final int NALU_HEADER_LENGTH = 4;
public static void setAvcTag(byte[] dst, int pos, boolean isAvcSequenceHeader, boolean isIdr, int readDataLength) {
// 高 4 位表示 FrameType:1 为关键帧,2 为非关键帧
// 低 4 位表示 CodecID:7 为 AVC
dst[pos] = isIdr ? (byte) 0x17 : (byte) 0x27;// FrameType | CodecID
// 0 为 AVCDecoderConfigurationRecord,1 为 AVC NALU
dst[pos + 1] = isAvcSequenceHeader ? (byte) 0x00 : (byte) 0x01;// AVCPacketType
dst[pos + 2] = (byte) 0x00;// CompositionTime
dst[pos + 3] = (byte) 0x00;// CompositionTime
dst[pos + 4] = (byte) 0x00;// CompositionTime
if (!isAvcSequenceHeader) {
// 4 个字节的 readDataLength
ByteArrayTools.intToFourByteArray(dst, pos + 5, readDataLength);
}
}
public static void setAacTag(byte[] dst, int pos, boolean isAACSequenceHeader) {
/**
* UB[4] 10=AAC
* UB[2] 3=44kHz
* UB[1] 1=16-bit
* UB[1] 0=MonoSound
*/
dst[pos] = (byte) 0xAE;
dst[pos + 1] = isAACSequenceHeader ? (byte) 0x00 : (byte) 0x01;
}
}

setAvcTag(byte[] dst, int pos, boolean isAvcSequenceHeader, boolean isIdr, int readDataLength)

FLV要求的AVCTAG body格式编码。

setAacTag(byte[] dst, int pos, boolean isAACSequenceHeader)

FLV要求的AACTAG body格式编码。


ScreenRecorder

获取数据,并按照FLV封装格式编码。

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public class ScreenRecorder extends Thread {
private static final String TAG = "ScreenRecorder";
private static final String MIME_TYPE = "video/avc"; // H.264 Advanced Video Coding
private static final int FRAME_RATE = 30; // 30fps
private static final int IFRAME_INTERVAL = 2; // 2s between I-frames
private static final int TIMEOUT_US = 10000;
private ResFlvDataCollecter mDataCollecter;
private int mWidth;
private int mHeight;
private int mBitRate;
private int mDpi;
private MediaProjection mMediaProjection;
private long startTime = 0;
private MediaCodec mediaCodec;
private Surface surface;
private AtomicBoolean quit = new AtomicBoolean(false);
private MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
private VirtualDisplay virtualDisplay;
public ScreenRecorder(ResFlvDataCollecter dataCollecter, int width, int height, int bitRate, int dpi, MediaProjection mediaProjection) {
super(TAG);
mDataCollecter = dataCollecter;
mWidth = width;
mHeight = height;
mBitRate = bitRate;
mDpi = dpi;
mMediaProjection = mediaProjection;
startTime = 0;
}
private void release() {
if (mediaCodec != null) {
mediaCodec.stop();
mediaCodec.release();
mediaCodec = null;
}
if (virtualDisplay != null) {
virtualDisplay.release();
}
if (mMediaProjection != null) {
mMediaProjection.stop();
}
}
@Override
public void run() {
try {
prepareEncoder();
/*将画面投影到 VirtualDisplay 中*/
virtualDisplay = mMediaProjection.createVirtualDisplay(TAG, mWidth, mHeight, mDpi,
DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC/*设置可以将其他显示器的内容反射到该 VirtualDisplay 上(TODO 默认只能是自身应用?)*/,
surface/*VirtualDisplay 将图像渲染到 Surface 中*/,
null, null);
Log.d(TAG, "created virtual display: " + virtualDisplay);
recordVirtualDisplay();
} catch (Exception e) {
e.printStackTrace();
} finally {
release();
}
}
private void prepareEncoder() {
try {
// 创建 video/avc 类型的编码器,在这个场景下,MediaCodec 只允许使用 video/avc 编码类型,使用其他的编码会 crash
mediaCodec = MediaCodec.createEncoderByType(MIME_TYPE);
// 设置视频格式:video/avc
MediaFormat format = MediaFormat.createVideoFormat(MIME_TYPE, mWidth, mHeight);
// 设置颜色格式:Surface
format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
// 设置比特率
format.setInteger(MediaFormat.KEY_BIT_RATE, mBitRate);
// 设置帧率:30fps
format.setInteger(MediaFormat.KEY_FRAME_RATE, FRAME_RATE);
// 设置关键帧间隔时间:2s
format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, IFRAME_INTERVAL);
// 编码器应用格式
mediaCodec.configure(format, null, null,
MediaCodec.CONFIGURE_FLAG_ENCODE/*设置该 MediaCodec 作为编码器使用*/);
// 创建 Surface
surface = mediaCodec.createInputSurface();
mediaCodec.start();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private void recordVirtualDisplay() {
while (!quit.get()) {
// 最多阻塞 10s,用于获取已成功解码的输出缓冲区的索引(缓冲的元数据会放到 bufferInfo 中)或者一个状态值
int eobIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, TIMEOUT_US);
switch (eobIndex) {
case MediaCodec.INFO_OUTPUT_FORMAT_CHANGED:
LogTools.d("MediaCodec.INFO_OUTPUT_FORMAT_CHANGED:" + mediaCodec.getOutputFormat().toString());
sendAvcDecoderConfigurationRecord(0, mediaCodec.getOutputFormat());
break;
case MediaCodec.INFO_TRY_AGAIN_LATER:
LogTools.d("MediaCodec.INFO_TRY_AGAIN_LATER");
break;
default:
LogTools.d("mediaCodec eobIndex=" + eobIndex);
/**
* we send sps pps already in INFO_OUTPUT_FORMAT_CHANGED
* so we ignore MediaCodec.BUFFER_FLAG_CODEC_CONFIG
*/
if (bufferInfo.flags != MediaCodec.BUFFER_FLAG_CODEC_CONFIG && bufferInfo.size != 0) {
if (startTime == 0) {
startTime = bufferInfo.presentationTimeUs / 1000;
}
//
ByteBuffer realData = mediaCodec.getOutputBuffer(eobIndex);
if (realData != null) {
realData.position(bufferInfo.offset + 4);// 跳过用于表示上个 TAG 大小的 4 个字节
realData.limit(bufferInfo.offset + bufferInfo.size);
sendAvcData((bufferInfo.presentationTimeUs / 1000) - startTime, realData);
}
}
mediaCodec.releaseOutputBuffer(eobIndex, false);
break;
}
}
}
private void sendAvcDecoderConfigurationRecord(long timeMs, MediaFormat format) {
byte[] avcDecoderConfigurationRecord = Packager.AvcPackager.generateAvcDecoderConfigurationRecord(format);
int packetLen = Packager.FlvPackager.FLV_VIDEO_TAG_HEADER_LENGTH + avcDecoderConfigurationRecord.length;
byte[] finalBuff = new byte[packetLen];
// 在 finalBuff 数组最前面插入 5 个字节的 FLV video TAG header
Packager.FlvPackager.setAvcTag(finalBuff, 0, true, true, avcDecoderConfigurationRecord.length);
// 将 avcDecoderConfigurationRecord 数组的数据拼接到 finalBuff 数组后面
System.arraycopy(avcDecoderConfigurationRecord, 0, finalBuff, Packager.FlvPackager.FLV_VIDEO_TAG_HEADER_LENGTH, avcDecoderConfigurationRecord.length);
ResFlvData resFlvData = new ResFlvData();
resFlvData.droppable = false;
resFlvData.byteBuffer = finalBuff;
resFlvData.size = finalBuff.length;
resFlvData.dts = (int) timeMs;
resFlvData.flvTagType = FLV_TAGTYPE_VIDEO;
resFlvData.videoFrameType = ResFlvData.AVC_NALU_TYPE_IDR;
mDataCollecter.collect(resFlvData, FLV_TAGTYPE_VIDEO);
}
private void sendAvcData(long timeMs, ByteBuffer data) {
int realDataLength = data.remaining();
int packetLen = Packager.FlvPackager.FLV_VIDEO_TAG_HEADER_LENGTH + Packager.FlvPackager.NALU_HEADER_LENGTH + realDataLength;
byte[] finalBuff = new byte[packetLen];
// 将 data 数组的数据放到 finalBuff 数组的第 Packager.FlvPackager.FLV_VIDEO_TAG_HEADER_LENGTH+Packager.FlvPackager.NALU_HEADER_LENGTH+1 个位置到结束
data.get(finalBuff, Packager.FlvPackager.FLV_VIDEO_TAG_HEADER_LENGTH + Packager.FlvPackager.NALU_HEADER_LENGTH, realDataLength);
// 获取 NALU 类型,计算后得 5 表示 NALU 类型是 AVC_NALU_TYPE_IDR
int frameType = finalBuff[Packager.FlvPackager.FLV_VIDEO_TAG_HEADER_LENGTH + Packager.FlvPackager.NALU_HEADER_LENGTH] & 0x1F;
// 在 finalBuff 数组最前面插入 9 个字节的 FLV video TAG(含 5 个字节的 header 和 4 个字节的 length)
Packager.FlvPackager.setAvcTag(finalBuff, 0, false, frameType == 5, realDataLength);
ResFlvData resFlvData = new ResFlvData();
resFlvData.droppable = true;
resFlvData.byteBuffer = finalBuff;
resFlvData.size = finalBuff.length;
resFlvData.dts = (int) timeMs;
resFlvData.flvTagType = FLV_TAGTYPE_VIDEO;
resFlvData.videoFrameType = frameType;
mDataCollecter.collect(resFlvData, FLV_TAGTYPE_VIDEO);
}
public boolean getStatus() {
return !quit.get();
}
public void quit() {
quit.set(true);
}
}

prepareEncoder()

准备编码器。

recordVirtualDisplay()

获取已解码的输出缓冲的索引,或者一个状态值。当是状态值MediaCodec.INFO_OUTPUT_FORMAT_CHANGED时,生成并发送AVCAVCDecoderConfigurationRecord;否则,生成并发送AVC数据。

sendAvcDecoderConfigurationRecord(long timeMs, MediaFormat format)

生成并发送AVCAVCDecoderConfigurationRecord

sendAvcData(long timeMs, ByteBuffer data)

生成并发送AVC数据。


FlvMetaData

FLV要求的onMetaData格式编码。

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public class FlvMetaData {
private static final String NAME = "onMetaData";
private static final int CODEC_ID_AAC = 7;
private static final int CODEC_ID_AVC = 10;
private static final int TYPE_NUMBER = 0;
private static final int TYPE_STRING = 2;
private static final int TYPE_ECMA_ARRAY = 8;
private static final int EMPTY_SIZE = 21;
private static final byte[] END_MARKER = {0x00, 0x00, 0x09};
private int dataSize;
private byte[] metaData;
private ArrayList<byte[]> metaDataList;
private int pointer;
public FlvMetaData() {
metaDataList = new ArrayList<>();
dataSize = 0;
}
public FlvMetaData(ResCoreParameters parameters) {
this();
// audio
setProperty("audiocodecid", CODEC_ID_AAC);
switch (parameters.mediacodecAACBitRate) {
case 32 * 1024:
setProperty("audiodatarate", 32);
break;
case 48 * 1024:
setProperty("audiodatarate", 48);
break;
case 64 * 1024:
setProperty("audiodatarate", 64);
break;
default:
LogTools.e("不支持的 audiodatarate: " + parameters.mediacodecAACBitRate);
break;
}
switch (parameters.mediacodecAACSampleRate) {
case 44100:
setProperty("audiosamplerate", 44100);
break;
default:
LogTools.e("不支持的 audiosamplerate: " + parameters.mediacodecAACSampleRate);
break;
}
// video
setProperty("videocodecid", CODEC_ID_AVC);
setProperty("framerate", parameters.mediacodecAVCFrameRate);
setProperty("width", parameters.videoWidth);
setProperty("height", parameters.videoHeight);
}
private void setProperty(String key, int value) {
addProperty(toFlvBytes(key), (byte) TYPE_NUMBER, toFlvBytes(value));
}
private void setProperty(String key, String value) {
addProperty(toFlvBytes(key), (byte) TYPE_STRING, toFlvBytes(value));
}
private void addProperty(byte[] key, byte dataType, byte[] value) {
int propertySize = key.length + 1 + value.length;
byte[] property = new byte[propertySize];
// property 数组的前 key.length 个元素是 key 数组
System.arraycopy(key, 0, property, 0, key.length);
// property 数组的第 key.length+1 个元素是 dataType
property[key.length] = dataType;
// property 数组的后 value.length 个元素是 value 数组
System.arraycopy(value, 0, property, key.length + 1, value.length);
metaDataList.add(property);
dataSize += propertySize;
}
/**
* 将 double 类型的值转为 8 字节的数组
*
* @param value
* @return
*/
private byte[] toFlvBytes(double value) {
long l = Double.doubleToLongBits(value);
return toUI(l, 8);
}
/**
* 将 String 类型的值转为 值长度+2 字节的数组,其中前 2 个字节表示数组的长度,后面的是数据
*
* @param value
* @return
*/
private byte[] toFlvBytes(String value) {
byte[] bytes = new byte[value.length() + 2];
// bytes 数组的前 2 个元素表示 value 的长度
System.arraycopy(toUI(value.length(), 2), 0, bytes, 0, 2);
// bytes 数组第 3 个元素到最后一个元素是数据
System.arraycopy(value.getBytes(), 0, bytes, 2, value.length());
return bytes;
}
/**
* 将 value 转为指定字节数的数组
*
* @param value
* @param length
* @return
*/
private byte[] toUI(long value, int length) {
byte[] bytes = new byte[length];
for (int i = 0; i < length; i++) {
bytes[length - 1 - i] = (byte) (value >> (8 * i) & 0xff);
}
return bytes;
}
/**
* 构建 SCRIPT TAG
*
* @return
*/
public byte[] getMetaData() {
metaData = new byte[dataSize + EMPTY_SIZE];
pointer = 0;
// 设置下一个内容的类型
addByte(TYPE_STRING);// 1 个字节
addByteArray(toFlvBytes(NAME));// 12 个字节
// 设置下一个内容的类型
addByte(TYPE_ECMA_ARRAY);// 1 个字节
addByteArray(toUI(metaDataList.size(), 4));// 4 个字节
for (byte[] property : metaDataList) {
addByteArray(property);// property长度 个字节
}
addByteArray(END_MARKER);// 3 个字节
return metaData;
}
private void addByte(int value) {
metaData[pointer] = (byte) value;
pointer++;
}
private void addByteArray(byte[] value) {
System.arraycopy(value, 0, metaData, pointer, value.length);
pointer += value.length;
}
}

screenrecorderrtmp

通过和librtmpC库交互,实现数据流读/写。

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#include <jni.h>
#include <screenrecorderrtmp.h>
#include <malloc.h>
#include "rtmp.h"
/*
* Class: net_yrom_screenrecorder_rtmp_RtmpClient
* Method: open
* Signature: (Ljava/lang/String;Z)J
*/
JNIEXPORT jlong JNICALL Java_net_yrom_screenrecorder_rtmp_RtmpClient_open(JNIEnv * env, jobject thiz, jstring url_, jboolean isPublishMode) {
LOGD("Java_net_yrom_screenrecorder_rtmp_RtmpClient_open(%s, %b)", url_, isPublishMode);
const char *url = (*env)->GetStringUTFChars(env, url_, 0);
// 创建一个 RTMP 会话的句柄
RTMP* rtmp = RTMP_Alloc();
if (rtmp == NULL) {
LOGD("rtmp == NULL");
return NULL;
}
// 初始化句柄
RTMP_Init(rtmp);
// 设置参数
int ret = RTMP_SetupURL(rtmp, url);
if (!ret) {
// 清理会话
RTMP_Free(rtmp);
rtmp = NULL;
LOGD("RTMP_SetupURL: %d", ret);
return NULL;
}
if (isPublishMode) {
// 设置可写
RTMP_EnableWrite(rtmp);
}
// 建立 RTMP 链接中的网络连接
ret = RTMP_Connect(rtmp, NULL);
if (!ret) {
// 清理会话
RTMP_Free(rtmp);
rtmp = NULL;
LOGD("RTMP_Connect: %d", ret);
return NULL;
}
// 建立 RTMP 链接中的网络流
ret = RTMP_ConnectStream(rtmp, 0);
if (!ret) {
// 关闭 RTMP 链接
RTMP_Close(rtmp);
// 清理会话
RTMP_Free(rtmp);
rtmp = NULL;
LOGD("RTMP_ConnectStream: %d", ret);
return NULL;
}
(*env)->ReleaseStringUTFChars(env, url_, url);
LOGD("RTMP_OPENED");
return rtmp;
}
/*
* Class: net_yrom_screenrecorder_rtmp_RtmpClient
* Method: read
* Signature: (J[BII)I
*/
JNIEXPORT jint JNICALL Java_net_yrom_screenrecorder_rtmp_RtmpClient_read(JNIEnv * env, jobject thiz, jlong rtmp, jbyteArray data_, jint offset, jint size) {
LOGD("Java_net_yrom_screenrecorder_rtmp_RtmpClient_read(%d, %d, %d)", rtmp, offset, size);
char* data = malloc(size*sizeof(char));
int readCount = RTMP_Read((RTMP*)rtmp, data, size);
if (readCount > 0) {
(*env)->SetByteArrayRegion(env, data_, offset, readCount, data);
}
free(data);
return readCount;
}
/*
* Class: net_yrom_screenrecorder_rtmp_RtmpClient
* Method: write
* Signature: (J[BIII)I
*/
JNIEXPORT jint JNICALL Java_net_yrom_screenrecorder_rtmp_RtmpClient_write(JNIEnv * env, jobject thiz, jlong rtmp, jbyteArray data, jint size, jint type, jint ts) {
LOGD("Java_net_yrom_screenrecorder_rtmp_RtmpClient_write(%d, %d, %d, %d)", rtmp, size, type, ts);
RTMPPacket *packet = (RTMPPacket*)malloc(sizeof(RTMPPacket));
RTMPPacket_Alloc(packet, size);
RTMPPacket_Reset(packet);
// 设置 Chunk Stream ID
if (type == RTMP_PACKET_TYPE_INFO) {// metadata
packet->m_nChannel = 0x03;// 自定义 Chunk Stream ID
} else if (type == RTMP_PACKET_TYPE_VIDEO) {// video
packet->m_nChannel = 0x04;// 自定义 Chunk Stream ID
} else if (type == RTMP_PACKET_TYPE_AUDIO) {// audio
packet->m_nChannel = 0x05;// 自定义 Chunk Stream ID
} else {
packet->m_nChannel = -1;
}
// 设置 Stream ID
packet->m_nInfoField2 = ((RTMP*)rtmp)->m_stream_id;
LOGD("((RTMP*)rtmp)->m_stream_id: %d", ((RTMP*)rtmp)->m_stream_id);
jbyte *buffer = (*env)->GetByteArrayElements(env, data, NULL);
memcpy(packet->m_body, buffer, size);
// 设置 Message Header 的格式和长度:0
packet->m_headerType = RTMP_PACKET_SIZE_LARGE;
// 设置是否使用绝对时间戳:不使用
packet->m_hasAbsTimestamp = FALSE;
// 设置时间戳
packet->m_nTimeStamp = ts;
// 设置包类型
packet->m_packetType = type;
// 设置消息长度
packet->m_nBodySize = size;
int ret = RTMP_SendPacket((RTMP*)rtmp, packet, 0);
if (!ret) {
LOGD("end write error: %d", ret);
return ret;
}else{
LOGD("end write success");
return 0;
}
RTMPPacket_Free(packet);
free(packet);
(*env)->ReleaseByteArrayElements(env, data, buffer, 0);
}
/*
* Class: net_yrom_screenrecorder_rtmp_RtmpClient
* Method: close
* Signature: (J)I
*/
JNIEXPORT jint JNICALL Java_net_yrom_screenrecorder_rtmp_RtmpClient_close(JNIEnv * env, jlong rtmp, jobject thiz) {
LOGD("Java_net_yrom_screenrecorder_rtmp_RtmpClient_close(%d)", rtmp);
RTMP_Close((RTMP*)rtmp);
RTMP_Free((RTMP*)rtmp);
return 0;
}
/*
* Class: net_yrom_screenrecorder_rtmp_RtmpClient
* Method: getIpAddr
* Signature: (J)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_net_yrom_screenrecorder_rtmp_RtmpClient_getIpAddr(JNIEnv * env, jobject thiz, jlong rtmp) {
LOGD("Java_net_yrom_screenrecorder_rtmp_RtmpClient_getIpAddr(%d)", rtmp);
if(rtmp!=0){
RTMP* r= (RTMP*)rtmp;
return (*env)->NewStringUTF(env, r->ipaddr);
}else {
return (*env)->NewStringUTF(env, "");
}
}

RtmpStreamingSender

维护一个发送队列,在连接服务端成功后,不断发送数据到服务端,如果发送速率低于添加速率,会跳过部分帧。当屏幕捕捉后,尝试添加到队列中,如果队列已满,则放弃添加到队列中。

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public class RtmpStreamingSender implements Runnable {
private static final String TAG = "RtmpStreamingSender";
private static class STATE {
private static final int START = 0;
private static final int RUNNING = 1;
private static final int STOPPED = 2;
}
private volatile int state;
private String mRtmpAddr = null;
private final Object lock = new Object();
private static final int MAX_QUEUE_CAPACITY = 50;
private LinkedBlockingDeque<ResFlvData> frameQueue = new LinkedBlockingDeque<>(MAX_QUEUE_CAPACITY);
private AtomicBoolean quit = new AtomicBoolean(false);
private FlvMetaData flvMetaData;
private ResCoreParameters coreParameters;
private long jniRtmpPointer = 0;
private int writeMsgNum = 0;
public RtmpStreamingSender() {
coreParameters = new ResCoreParameters();
coreParameters.mediacodecAACBitRate = ResFlvData.AAC_BITRATE;
coreParameters.mediacodecAACSampleRate = ResFlvData.AAC_SAMPLE_RATE;
coreParameters.mediacodecAVCFrameRate = ResFlvData.FPS;
coreParameters.videoWidth = ResFlvData.VIDEO_WIDTH;
coreParameters.videoHeight = ResFlvData.VIDEO_HEIGHT;
flvMetaData = new FlvMetaData(coreParameters);
}
@Override
public void run() {
while (!quit.get()) {
if (frameQueue.size() > 0) {
switch (state) {
case STATE.START:
if (TextUtils.isEmpty(mRtmpAddr)) {
LogTools.e("rtmp address is null!");
break;
}
// 建立 RTMP 链接
jniRtmpPointer = RtmpClient.open(mRtmpAddr, true);
if (jniRtmpPointer != 0) {
// 获取地址
String serverIpAddr = RtmpClient.getIpAddr(jniRtmpPointer);
LogTools.d("server ip address: " + serverIpAddr);
// 发送 onMetaData TAG
byte[] metaData = flvMetaData.getMetaData();
RtmpClient.write(jniRtmpPointer, metaData, metaData.length, ResFlvData.FLV_TAGTYPE_SCRIPT_DATA, 0);
state = STATE.RUNNING;
}
break;
case STATE.RUNNING:
synchronized (lock) {
--writeMsgNum;
}
ResFlvData flvData = frameQueue.pop();
// 如果发送队列中的数据过多,在条件满足的情况下,忽略这个数据
if (writeMsgNum >= (MAX_QUEUE_CAPACITY * 2 / 3) && flvData.flvTagType == ResFlvData.FLV_TAGTYPE_VIDEO && flvData.droppable) {
LogTools.d("senderQueue is crowded, abort a frame");
break;
}
// 发送 AVC TAG
int result = RtmpClient.write(jniRtmpPointer, flvData.byteBuffer, flvData.byteBuffer.length, flvData.flvTagType, flvData.dts);
if (result == 0) {
switch (flvData.flvTagType) {
case ResFlvData.FLV_TAGTYPE_VIDEO:
LogTools.d("video frame sent: " + flvData.size);
break;
case ResFlvData.FLV_TAGTYPE_AUDIO:
LogTools.d("audio frame sent: " + flvData.size);
break;
}
} else {
LogTools.e("write error: " + result);
}
break;
case STATE.STOPPED:
// 关闭 RTMP 链接
result = RtmpClient.close(jniRtmpPointer);
LogTools.d("close result: " + result);
break;
}
}
}
int result = RtmpClient.close(jniRtmpPointer);
LogTools.e("close result: " + result);
}
public void sendStart(String rtmpAddr) {
synchronized (lock) {
writeMsgNum = 0;
}
mRtmpAddr = rtmpAddr;
state = STATE.START;
}
public void sendStop() {
synchronized (lock) {
writeMsgNum = 0;
}
state = STATE.STOPPED;
}
public void sendFood(ResFlvData flvData, int type) {
synchronized (lock) {
if (writeMsgNum <= MAX_QUEUE_CAPACITY) {
frameQueue.add(flvData);
++writeMsgNum;
} else {
LogTools.d("senderQueue is full, abort a frame");
}
}
}
public final void quit() {
quit.set(true);
}
}

ScreenRecordActivity

控制屏幕捕捉和推流。

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public class ScreenRecordActivity extends Activity implements View.OnClickListener {
private static final String TAG = "ScreenRecordActivity";
private static final int REQUEST_CODE = 1;
private Button button;
private EditText rtmpAddrET;
private String rtmpAddr;
private boolean isRecording;
private MediaProjectionManager mediaProjectionManager;
private ScreenRecorder screenRecorder;
private RtmpStreamingSender streamingSender;
private ExecutorService executorService;
private ResAudioClient audioClient;
private ResCoreParameters coreParameters;
private ServiceConnection connection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
}
@Override
public void onServiceDisconnected(ComponentName name) {
}
};
public static void launchActivity(Context context) {
Intent intent = new Intent(context, ScreenRecordActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = findViewById(R.id.button);
button.setOnClickListener(this);
rtmpAddrET = findViewById(R.id.et_rtmp_address);
mediaProjectionManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);
}
@Override
protected void onResume() {
super.onResume();
if (isRecording) {
stopScreenRecordService();// 在录屏状态,切换回应用,则停止录屏
}
}
@Override
protected void onStop() {
super.onStop();
if (isRecording) {
startScreenRecordService();// 最小化应用后,开始录屏
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (screenRecorder != null) {
stopScreenRecord();
}
}
@Override
public void onClick(View v) {
if (screenRecorder != null) {
stopScreenRecord();
} else {
startScreenCapture();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.d(TAG, "onActivityResult(" + requestCode + ", " + resultCode + ")");
MediaProjection mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data);// 获取屏幕捕捉
if (mediaProjection == null) {
Log.e(TAG, "media projection is null");
return;
}
rtmpAddr = rtmpAddrET.getText().toString().trim();
if (TextUtils.isEmpty(rtmpAddr)) {
Log.e(TAG, "rtmp address cannot be null");
Toast.makeText(this, "rtmp address cannot be null", Toast.LENGTH_SHORT).show();
return;
}
coreParameters = new ResCoreParameters();
audioClient = new ResAudioClient(coreParameters);
if (!audioClient.prepare()) {
LogTools.d("!!!!!audioClient.prepare() failed");
return;
}
streamingSender = new RtmpStreamingSender();
streamingSender.sendStart(rtmpAddr);
ResFlvDataCollecter collecter = new ResFlvDataCollecter() {
@Override
public void collect(ResFlvData flvData, int type) {
streamingSender.sendFood(flvData, type);
}
};
screenRecorder = new ScreenRecorder(collecter, ResFlvData.VIDEO_WIDTH, ResFlvData.VIDEO_HEIGHT, ResFlvData.VIDEO_BITRATE, 1, mediaProjection);
screenRecorder.start();
audioClient.start(collecter);
executorService = Executors.newCachedThreadPool();
executorService.execute(streamingSender);
button.setText("Stop Recorder");
Toast.makeText(this, "Screen recorder is running...", Toast.LENGTH_LONG).show();
moveTaskToBack(true);// 最小化应用
}
private void startScreenCapture() {
Log.d(TAG, "startScreenCapture()");
isRecording = true;
Intent captureIntent = mediaProjectionManager.createScreenCaptureIntent();// 获取封装好的用于开始屏幕捕捉的 intent
startActivityForResult(captureIntent, REQUEST_CODE);
}
private void stopScreenRecord() {
Log.d(TAG, "stopScreenRecord()");
screenRecorder.quit();
screenRecorder = null;
if (streamingSender != null) {
streamingSender.sendStop();
streamingSender.quit();
streamingSender = null;
}
if (executorService != null) {
executorService.shutdown();
executorService = null;
}
button.setText("Restart recorder");
}
private void startScreenRecordService() {
Log.d(TAG, "startScreenRecordService()");
if (screenRecorder != null && screenRecorder.getStatus()) {
Intent intent = new Intent(this, ScreenRecordListenerService.class);
bindService(intent, connection, BIND_AUTO_CREATE);
startService(intent);
}
}
private void stopScreenRecordService() {
Log.d(TAG, "stopScreenRecordService()");
Intent intent = new Intent(this, ScreenRecordListenerService.class);
stopService(intent);
if (screenRecorder != null && screenRecorder.getStatus()) {
Toast.makeText(this, "现在正在进行录屏直播哦", Toast.LENGTH_SHORT).show();
}
}
}

onActivityResult(int requestCode, int resultCode, Intent data)

向输入框中的地址进行RTMP推流。

startScreenCapture()

开始屏幕捕捉。

stopScreenRecord()

停止屏幕捕捉。

startScreenRecordService()

开始监听推流进度。

stopScreenRecordService()

停止监听推流进度。


本文标题:ScreenRecorder 代码解读

文章作者:魏超

发布时间:2018年02月27日 - 01:02

最后更新:2018年12月07日 - 19:12

原始链接:http://www.weichao.io/2018/02/27/ScreenRecorder-代码解读/

许可协议: 署名-非商业性使用-禁止演绎 4.0 国际 转载请保留原文链接及作者。

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