Android 由于会话选项无效，webrtc 无法创建报价
Android webrtc cannot create offer due to invalid session options
我尝试使用 webrtc sdk 在 android 中创建视频聊天实现，使用 Firebase FireStore 作为信号机制。我遵循了一些教程并成功地创建了对等连接。
最初我尝试将视频流从一个对等点发送到另一个对等点并且它起作用了。然后，当我尝试将音轨添加到流中时，初始对等方无法再创建报价（我从调试中发现了这一点）。导致webrtc连接无法再建立。现在我很困惑这是怎么发生的。
后来我还发现，如果我只添加一个轨道，无论是音轨还是视频轨道，那么我的应用程序都可以正常工作，但如果我尝试同时添加音频和视频轨道，那么初始对等方将无法再创建报价。
这是我的 CallActivity.java 的完整代码，其中包含所有 webrtc 实现。我从这段代码中删除了一些我认为不需要的不需要的语句。
public class CallActivity extends AppCompatActivity {
private String userUid, friendUid;
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private boolean isInitiator = false;
//request codes
private int CAMERA_PERMISSION_CODE = 0;
//views
SurfaceViewRenderer localVideoView, friendVideoView;
//webrtc
private EglBase rootEglBase;
private PeerConnectionFactory factory;
private PeerConnection peerConnection;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call);
userUid = getIntent().getStringExtra("userUid");
friendUid = getIntent().getStringExtra("friendUid");
isInitiator = getIntent().getBooleanExtra("initiator", false);
checkPermissions();
initialize();
setupFireStoreListeners();
}
@Override
public void onBackPressed() {
hangup();
}
private void initialize()
{
//initialize views
rootEglBase = EglBase.create();
localVideoView = findViewById(R.id.localVideo);
localVideoView.init(rootEglBase.getEglBaseContext(), null);
localVideoView.setEnableHardwareScaler(true);
localVideoView.setMirror(true);
friendVideoView = findViewById(R.id.friendVideo);
friendVideoView.init(rootEglBase.getEglBaseContext(), null);
friendVideoView.setEnableHardwareScaler(true);
friendVideoView.setMirror(true);
//initialize peer connection factory
PeerConnectionFactory.InitializationOptions initializationOptions = PeerConnectionFactory.InitializationOptions.builder(this)
.setEnableInternalTracer(true)
.setFieldTrials("WebRTC-H264HighProfile/Enabled/")
.createInitializationOptions();
PeerConnectionFactory.initialize(initializationOptions);
PeerConnectionFactory.Options options = new PeerConnectionFactory.Options();
options.disableEncryption = true;
options.disableNetworkMonitor = true;
factory = PeerConnectionFactory.builder()
.setOptions(options)
.setVideoDecoderFactory(new DefaultVideoDecoderFactory(rootEglBase.getEglBaseContext()))
.setVideoEncoderFactory(new DefaultVideoEncoderFactory(rootEglBase.getEglBaseContext(), true, true))
.createPeerConnectionFactory();
//create video track form camera and show it
VideoCapturer videoCapturer = createVideoCapturer();
if(videoCapturer == null){
finish();
return;
}
VideoSource videoSource = factory.createVideoSource(false);
SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create(Thread.currentThread().getName(), rootEglBase.getEglBaseContext());
videoCapturer.initialize(surfaceTextureHelper, localVideoView.getContext(), videoSource.getCapturerObserver());
videoCapturer.startCapture(1240, 720, 30);
VideoTrack localVideoTrack = factory.createVideoTrack("local", videoSource);
localVideoTrack.addSink(localVideoView);
//set ice candidates to null
db.document("users/" + userUid).update("ice", null);
db.document("users/" + friendUid).update("ice", null);
//create peer connection
ArrayList<PeerConnection.IceServer> iceServers = new ArrayList<>();
iceServers.add(PeerConnection.IceServer.builder("stun:stun.l.google.com:19302").createIceServer());
PeerConnection.Observer pcObserver = new SimplePeerConnectionObserver() {
@Override
public void onIceCandidate(IceCandidate iceCandidate) {
Log.d("WEBRTCD", "Ice");
db.runTransaction(new Transaction.Function<Void>() {
@Nullable
@Override
public Void apply(@NonNull Transaction transaction) throws FirebaseFirestoreException {
List<Map> iceList = (List<Map>) transaction.get(db.document("users/" + friendUid)).get("ice");
if(iceList == null) iceList = new ArrayList<>();
Map<String, Object> ice = new HashMap<>();
ice.put("label", iceCandidate.sdpMLineIndex);
ice.put("id", iceCandidate.sdpMid);
ice.put("sdp", iceCandidate.sdp);
iceList.add(0, ice);
transaction.update(db.document("users/" + friendUid), "ice", iceList);
return null;
}
});
}
@Override
public void onAddStream(MediaStream mediaStream) {
VideoTrack remoteVideoTrack = mediaStream.videoTracks.get(0);
if(mediaStream.audioTracks.size() > 0) {
AudioTrack remoteAudioTrack = mediaStream.audioTracks.get(0);
remoteAudioTrack.setEnabled(true);
}
remoteVideoTrack.setEnabled(true);
remoteVideoTrack.addSink(friendVideoView);
}
};
peerConnection = factory.createPeerConnection(iceServers, pcObserver);
//create audio track
MediaConstraints audioConstraints = new MediaConstraints();
AudioSource audioSource = factory.createAudioSource(audioConstraints);
AudioTrack localAudioTrack = factory.createAudioTrack("local", audioSource);
peerConnection.setAudioRecording(true);
peerConnection.setAudioPlayout(true);
//add stream to peer connection
MediaStream mediaStream = factory.createLocalMediaStream("local");
//mediaStream.addTrack(localAudioTrack);
mediaStream.addTrack(localVideoTrack);
peerConnection.addStream(mediaStream);
if(isInitiator) doCall();
else doAnswer();
}
private void doCall()
{
db.document("users/" + friendUid).update("call", userUid);
MediaConstraints mediaConstraints = new MediaConstraints();
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveAudio", "true"));
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveVideo", "true"));
peerConnection.createOffer(new SimpleSdpObserver() {
@Override
public void onCreateSuccess(SessionDescription sessionDescription) {
peerConnection.setLocalDescription(new SimpleSdpObserver(), sessionDescription);
Map<String, String> sdp = new HashMap<>();
sdp.put("type", "offer");
sdp.put("desc", sessionDescription.description);
db.document("users/" + friendUid).update("sdp", sdp);
}
}, mediaConstraints);
}
private void doAnswer()
{
db.document("users/" + friendUid).update("call", userUid);
db.document("users/" + userUid).get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if(task.isSuccessful() && task.getResult() != null)
{
Map sdpData = (Map) task.getResult().get("sdp");
MediaConstraints mediaConstraints = new MediaConstraints();
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveAudio", "true"));
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveVideo", "true"));
peerConnection.setRemoteDescription(new SimpleSdpObserver(), new SessionDescription(SessionDescription.Type.OFFER, (String) sdpData.get("desc")));
peerConnection.createAnswer(new SimpleSdpObserver(){
@Override
public void onCreateSuccess(SessionDescription sessionDescription) {
peerConnection.setLocalDescription(new SimpleSdpObserver(), sessionDescription);
Map<String, String> sdp = new HashMap<>();
sdp.put("type", "answer");
sdp.put("desc", sessionDescription.description);
db.document("users/" + friendUid).update("sdp", sdp);
}
}, mediaConstraints);
}
}
});
}
private void hangup()
{
db.document("users/" + friendUid).update("call", "hangup", "ice", null, "sdp", null);
db.document("users/" + userUid).update("call", "hangup", "ice", null, "sdp", null);
}
private void setupFireStoreListeners()
{
//listen for ice candidates
db.document("users/" + userUid).addSnapshotListener(this, new EventListener<DocumentSnapshot>() {
@Override
public void onEvent(@Nullable DocumentSnapshot value, @Nullable FirebaseFirestoreException error) {
if(value != null && value.get("ice") != null)
{
List<Map> iceList = (List<Map>) value.get("ice");
if(iceList == null) iceList = new ArrayList<>();
for(Map iceCandidate : iceList) {
Log.d("WEBRTCD", "Ice added");
peerConnection.addIceCandidate(new IceCandidate((String) iceCandidate.get("id"), Integer.parseInt(iceCandidate.get("label") + ""), (String) iceCandidate.get("sdp")));
}
//db.document("users/" + userUid).update("ice", null);
}
}
});
//listen for hangup
db.document("users/" + userUid).addSnapshotListener(this, new EventListener<DocumentSnapshot>() {
@Override
public void onEvent(@Nullable DocumentSnapshot value, @Nullable FirebaseFirestoreException error) {
if(value != null && value.get("call") != null && value.get("call").equals("hangup"))
{
db.document("users/" + userUid).update("call", null);
endCall();
}
}
});
//listen for answer if initiator
if(!isInitiator) return;
db.document("users/" + userUid).addSnapshotListener(this, new EventListener<DocumentSnapshot>() {
@Override
public void onEvent(@Nullable DocumentSnapshot value, @Nullable FirebaseFirestoreException error) {
if(value != null && value.get("sdp") != null) {
peerConnection.setRemoteDescription(new SimpleSdpObserver(), new SessionDescription(SessionDescription.Type.ANSWER, (String) ((Map) value.get("sdp")).get("desc")));
db.document("users/" + userUid).update("sdp", null);
}
}
});
}
private void endCall(){
peerConnection.close();
super.onBackPressed();
}
private VideoCapturer createVideoCapturer() {
VideoCapturer videoCapturer;
CameraEnumerator enumerator;
if(Camera2Enumerator.isSupported(this))
enumerator = new Camera2Enumerator(this);
else
enumerator = new Camera1Enumerator(true);
for (String device : enumerator.getDeviceNames()) {
if(enumerator.isFrontFacing(device)) {
videoCapturer = enumerator.createCapturer(device, null);
if(videoCapturer != null)
return videoCapturer;
}
}
for (String device : enumerator.getDeviceNames()) {
if(!enumerator.isFrontFacing(device)) {
videoCapturer = enumerator.createCapturer(device, null);
if(videoCapturer != null)
return videoCapturer;
}
}
return null;
}
}
请注意这一行
//mediaStream.addTrack(localAudioTrack);
接近 initialize() 函数的末尾。由于此行已被注释，所以一切正常，但如果我取消注释此行，webrtc 无法创建连接，因为没有成功创建报价，这是我不知道如何解决的问题。我尝试谷歌搜索，只发现了一些与 webrtc 浏览器无关的问题 api。我不明白这一行如何阻止整个 webrtc 连接正常工作。 （我知道 webrtc 无法创建报价，因为 peerConnection.createOffer() 之后的 onCreateSuccess() 方法，如果我取消注释此行，则永远不会被调用）。由于此行注释一切正常，我不认为执行信号的我的 firestore 代码是个问题。
这是 build.gradle 文件：
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
defaultConfig {
applicationId "com.example.myapplication"
minSdkVersion 19
targetSdkVersion 29
versionCode 1
versionName "1.0"
multiDexEnabled true
vectorDrawables.useSupportLibrary true
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'com.google.firebase:firebase-firestore:21.5.0'
implementation 'com.android.support:multidex:1.0.3'
implementation 'com.google.firebase:firebase-auth:19.3.2'
implementation 'com.google.firebase:firebase-storage:19.1.1'
implementation 'androidx.navigation:navigation-fragment:2.3.0'
implementation 'androidx.navigation:navigation-ui:2.3.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
implementation 'com.google.firebase:firebase-messaging:20.2.4'
testImplementation 'junit:junit:4.13'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation 'com.google.android.material:material:1.2.0'
implementation 'androidx.documentfile:documentfile:1.0.1'
implementation "com.mikepenz:materialdrawer:6.1.2"
implementation 'org.webrtc:google-webrtc:1.0.30039'
}
我遵循了一些关于 webrtc 的在线教程 android，所有这些教程都只处理视频流（在我的应用程序中有效）。由于没有官方的 webrtc 文档，我不知道如何解决这个问题。请帮忙！
好的，我想通了，音视频轨道必须有唯一的ID。在我的例子中，音频和视频轨道都有 id“本地”，这搞乱了 webrtc，它们必须有不同的 ID。此外，在通话时，客户端在流中应具有不同的 ID。
就我而言，我将音频和视频轨道 ID 分别更改为 _audio 和 _video，并且有效
我尝试使用 webrtc sdk 在 android 中创建视频聊天实现，使用 Firebase FireStore 作为信号机制。我遵循了一些教程并成功地创建了对等连接。
最初我尝试将视频流从一个对等点发送到另一个对等点并且它起作用了。然后，当我尝试将音轨添加到流中时，初始对等方无法再创建报价（我从调试中发现了这一点）。导致webrtc连接无法再建立。现在我很困惑这是怎么发生的。
后来我还发现，如果我只添加一个轨道，无论是音轨还是视频轨道，那么我的应用程序都可以正常工作，但如果我尝试同时添加音频和视频轨道，那么初始对等方将无法再创建报价。
这是我的 CallActivity.java 的完整代码，其中包含所有 webrtc 实现。我从这段代码中删除了一些我认为不需要的不需要的语句。
public class CallActivity extends AppCompatActivity {
private String userUid, friendUid;
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private boolean isInitiator = false;
//request codes
private int CAMERA_PERMISSION_CODE = 0;
//views
SurfaceViewRenderer localVideoView, friendVideoView;
//webrtc
private EglBase rootEglBase;
private PeerConnectionFactory factory;
private PeerConnection peerConnection;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call);
userUid = getIntent().getStringExtra("userUid");
friendUid = getIntent().getStringExtra("friendUid");
isInitiator = getIntent().getBooleanExtra("initiator", false);
checkPermissions();
initialize();
setupFireStoreListeners();
}
@Override
public void onBackPressed() {
hangup();
}
private void initialize()
{
//initialize views
rootEglBase = EglBase.create();
localVideoView = findViewById(R.id.localVideo);
localVideoView.init(rootEglBase.getEglBaseContext(), null);
localVideoView.setEnableHardwareScaler(true);
localVideoView.setMirror(true);
friendVideoView = findViewById(R.id.friendVideo);
friendVideoView.init(rootEglBase.getEglBaseContext(), null);
friendVideoView.setEnableHardwareScaler(true);
friendVideoView.setMirror(true);
//initialize peer connection factory
PeerConnectionFactory.InitializationOptions initializationOptions = PeerConnectionFactory.InitializationOptions.builder(this)
.setEnableInternalTracer(true)
.setFieldTrials("WebRTC-H264HighProfile/Enabled/")
.createInitializationOptions();
PeerConnectionFactory.initialize(initializationOptions);
PeerConnectionFactory.Options options = new PeerConnectionFactory.Options();
options.disableEncryption = true;
options.disableNetworkMonitor = true;
factory = PeerConnectionFactory.builder()
.setOptions(options)
.setVideoDecoderFactory(new DefaultVideoDecoderFactory(rootEglBase.getEglBaseContext()))
.setVideoEncoderFactory(new DefaultVideoEncoderFactory(rootEglBase.getEglBaseContext(), true, true))
.createPeerConnectionFactory();
//create video track form camera and show it
VideoCapturer videoCapturer = createVideoCapturer();
if(videoCapturer == null){
finish();
return;
}
VideoSource videoSource = factory.createVideoSource(false);
SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create(Thread.currentThread().getName(), rootEglBase.getEglBaseContext());
videoCapturer.initialize(surfaceTextureHelper, localVideoView.getContext(), videoSource.getCapturerObserver());
videoCapturer.startCapture(1240, 720, 30);
VideoTrack localVideoTrack = factory.createVideoTrack("local", videoSource);
localVideoTrack.addSink(localVideoView);
//set ice candidates to null
db.document("users/" + userUid).update("ice", null);
db.document("users/" + friendUid).update("ice", null);
//create peer connection
ArrayList<PeerConnection.IceServer> iceServers = new ArrayList<>();
iceServers.add(PeerConnection.IceServer.builder("stun:stun.l.google.com:19302").createIceServer());
PeerConnection.Observer pcObserver = new SimplePeerConnectionObserver() {
@Override
public void onIceCandidate(IceCandidate iceCandidate) {
Log.d("WEBRTCD", "Ice");
db.runTransaction(new Transaction.Function<Void>() {
@Nullable
@Override
public Void apply(@NonNull Transaction transaction) throws FirebaseFirestoreException {
List<Map> iceList = (List<Map>) transaction.get(db.document("users/" + friendUid)).get("ice");
if(iceList == null) iceList = new ArrayList<>();
Map<String, Object> ice = new HashMap<>();
ice.put("label", iceCandidate.sdpMLineIndex);
ice.put("id", iceCandidate.sdpMid);
ice.put("sdp", iceCandidate.sdp);
iceList.add(0, ice);
transaction.update(db.document("users/" + friendUid), "ice", iceList);
return null;
}
});
}
@Override
public void onAddStream(MediaStream mediaStream) {
VideoTrack remoteVideoTrack = mediaStream.videoTracks.get(0);
if(mediaStream.audioTracks.size() > 0) {
AudioTrack remoteAudioTrack = mediaStream.audioTracks.get(0);
remoteAudioTrack.setEnabled(true);
}
remoteVideoTrack.setEnabled(true);
remoteVideoTrack.addSink(friendVideoView);
}
};
peerConnection = factory.createPeerConnection(iceServers, pcObserver);
//create audio track
MediaConstraints audioConstraints = new MediaConstraints();
AudioSource audioSource = factory.createAudioSource(audioConstraints);
AudioTrack localAudioTrack = factory.createAudioTrack("local", audioSource);
peerConnection.setAudioRecording(true);
peerConnection.setAudioPlayout(true);
//add stream to peer connection
MediaStream mediaStream = factory.createLocalMediaStream("local");
//mediaStream.addTrack(localAudioTrack);
mediaStream.addTrack(localVideoTrack);
peerConnection.addStream(mediaStream);
if(isInitiator) doCall();
else doAnswer();
}
private void doCall()
{
db.document("users/" + friendUid).update("call", userUid);
MediaConstraints mediaConstraints = new MediaConstraints();
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveAudio", "true"));
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveVideo", "true"));
peerConnection.createOffer(new SimpleSdpObserver() {
@Override
public void onCreateSuccess(SessionDescription sessionDescription) {
peerConnection.setLocalDescription(new SimpleSdpObserver(), sessionDescription);
Map<String, String> sdp = new HashMap<>();
sdp.put("type", "offer");
sdp.put("desc", sessionDescription.description);
db.document("users/" + friendUid).update("sdp", sdp);
}
}, mediaConstraints);
}
private void doAnswer()
{
db.document("users/" + friendUid).update("call", userUid);
db.document("users/" + userUid).get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if(task.isSuccessful() && task.getResult() != null)
{
Map sdpData = (Map) task.getResult().get("sdp");
MediaConstraints mediaConstraints = new MediaConstraints();
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveAudio", "true"));
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveVideo", "true"));
peerConnection.setRemoteDescription(new SimpleSdpObserver(), new SessionDescription(SessionDescription.Type.OFFER, (String) sdpData.get("desc")));
peerConnection.createAnswer(new SimpleSdpObserver(){
@Override
public void onCreateSuccess(SessionDescription sessionDescription) {
peerConnection.setLocalDescription(new SimpleSdpObserver(), sessionDescription);
Map<String, String> sdp = new HashMap<>();
sdp.put("type", "answer");
sdp.put("desc", sessionDescription.description);
db.document("users/" + friendUid).update("sdp", sdp);
}
}, mediaConstraints);
}
}
});
}
private void hangup()
{
db.document("users/" + friendUid).update("call", "hangup", "ice", null, "sdp", null);
db.document("users/" + userUid).update("call", "hangup", "ice", null, "sdp", null);
}
private void setupFireStoreListeners()
{
//listen for ice candidates
db.document("users/" + userUid).addSnapshotListener(this, new EventListener<DocumentSnapshot>() {
@Override
public void onEvent(@Nullable DocumentSnapshot value, @Nullable FirebaseFirestoreException error) {
if(value != null && value.get("ice") != null)
{
List<Map> iceList = (List<Map>) value.get("ice");
if(iceList == null) iceList = new ArrayList<>();
for(Map iceCandidate : iceList) {
Log.d("WEBRTCD", "Ice added");
peerConnection.addIceCandidate(new IceCandidate((String) iceCandidate.get("id"), Integer.parseInt(iceCandidate.get("label") + ""), (String) iceCandidate.get("sdp")));
}
//db.document("users/" + userUid).update("ice", null);
}
}
});
//listen for hangup
db.document("users/" + userUid).addSnapshotListener(this, new EventListener<DocumentSnapshot>() {
@Override
public void onEvent(@Nullable DocumentSnapshot value, @Nullable FirebaseFirestoreException error) {
if(value != null && value.get("call") != null && value.get("call").equals("hangup"))
{
db.document("users/" + userUid).update("call", null);
endCall();
}
}
});
//listen for answer if initiator
if(!isInitiator) return;
db.document("users/" + userUid).addSnapshotListener(this, new EventListener<DocumentSnapshot>() {
@Override
public void onEvent(@Nullable DocumentSnapshot value, @Nullable FirebaseFirestoreException error) {
if(value != null && value.get("sdp") != null) {
peerConnection.setRemoteDescription(new SimpleSdpObserver(), new SessionDescription(SessionDescription.Type.ANSWER, (String) ((Map) value.get("sdp")).get("desc")));
db.document("users/" + userUid).update("sdp", null);
}
}
});
}
private void endCall(){
peerConnection.close();
super.onBackPressed();
}
private VideoCapturer createVideoCapturer() {
VideoCapturer videoCapturer;
CameraEnumerator enumerator;
if(Camera2Enumerator.isSupported(this))
enumerator = new Camera2Enumerator(this);
else
enumerator = new Camera1Enumerator(true);
for (String device : enumerator.getDeviceNames()) {
if(enumerator.isFrontFacing(device)) {
videoCapturer = enumerator.createCapturer(device, null);
if(videoCapturer != null)
return videoCapturer;
}
}
for (String device : enumerator.getDeviceNames()) {
if(!enumerator.isFrontFacing(device)) {
videoCapturer = enumerator.createCapturer(device, null);
if(videoCapturer != null)
return videoCapturer;
}
}
return null;
}
}
请注意这一行
//mediaStream.addTrack(localAudioTrack);
接近 initialize() 函数的末尾。由于此行已被注释，所以一切正常，但如果我取消注释此行，webrtc 无法创建连接，因为没有成功创建报价，这是我不知道如何解决的问题。我尝试谷歌搜索，只发现了一些与 webrtc 浏览器无关的问题 api。我不明白这一行如何阻止整个 webrtc 连接正常工作。 （我知道 webrtc 无法创建报价，因为 peerConnection.createOffer() 之后的 onCreateSuccess() 方法，如果我取消注释此行，则永远不会被调用）。由于此行注释一切正常，我不认为执行信号的我的 firestore 代码是个问题。
这是 build.gradle 文件：
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
defaultConfig {
applicationId "com.example.myapplication"
minSdkVersion 19
targetSdkVersion 29
versionCode 1
versionName "1.0"
multiDexEnabled true
vectorDrawables.useSupportLibrary true
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'com.google.firebase:firebase-firestore:21.5.0'
implementation 'com.android.support:multidex:1.0.3'
implementation 'com.google.firebase:firebase-auth:19.3.2'
implementation 'com.google.firebase:firebase-storage:19.1.1'
implementation 'androidx.navigation:navigation-fragment:2.3.0'
implementation 'androidx.navigation:navigation-ui:2.3.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
implementation 'com.google.firebase:firebase-messaging:20.2.4'
testImplementation 'junit:junit:4.13'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation 'com.google.android.material:material:1.2.0'
implementation 'androidx.documentfile:documentfile:1.0.1'
implementation "com.mikepenz:materialdrawer:6.1.2"
implementation 'org.webrtc:google-webrtc:1.0.30039'
}
我遵循了一些关于 webrtc 的在线教程 android，所有这些教程都只处理视频流（在我的应用程序中有效）。由于没有官方的 webrtc 文档，我不知道如何解决这个问题。请帮忙！
好的，我想通了，音视频轨道必须有唯一的ID。在我的例子中，音频和视频轨道都有 id“本地”，这搞乱了 webrtc，它们必须有不同的 ID。此外，在通话时，客户端在流中应具有不同的 ID。
就我而言，我将音频和视频轨道 ID 分别更改为 _audio 和 _video，并且有效