To add Audio/Video Calling support in your application,

Include the class <CometChatSDK/AVChat.h> in the .h file of your class.

All the method calls will invoke their respective callback blocks as defined below.

1. Initialize the AVChat object :

AVChat *avChat =  [[AVChat alloc] init];

2. Send call request
Send Audio Video call request to the userID specified. (Ensure that userID cannot be nil or empty)

- (void)sendAVChatRequestToUser:(NSString *) userID
                        success:(void(^)(NSDictionary *)) response
                        failure:(void(^)(NSError *)) failure;

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After audio video call request is sent successfully.
Response: NSDictionary containing id of the user to whom audio video call request has been sent.
Eg:

{  
  callID = "\"474a3e0baf0e3db251a2bc2a6a5b31a5\"";  
  userID = 5;
}

(ii). (void(^)(NSError *error))failure
Invocation: If an error occurs while sending audio video call request
Response: NSError containing error code and message
Usage:

[avChat sendAVChatRequestToUser:@”5”
                        success:^(NSDictionary *response) {
                      } failure:^(NSError * error) {
}];

3. Accept call request
Accept audio-video call request when AVCHAT_INCOMING_CALL message is received in the onAVChatMessageReceived callback block. (Ensure that userID specified should be same as the userID received in AVCHAT_INCOMING_CALL message and also userID cannot be nil or empty)

- (void) acceptAVChatRequestOfUser:(NSString *)userID
                            callID:(NSString *)callID
                           success:(void(^)(NSDictionary *response)) response
                           failure:(void(^)(NSError *error)) failure;

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After sending audio video call acknowledgement request successfully
Response: NSDictionary containing id of the user to whom audio video call acknowledgement has been sent
Eg:

 {  
 userID = 6;
}

(ii). (void(^)(NSError *error))failure
Invocation: If an error occurs while sending audio video call request
Response: NSError containing error code and message
Usage:

[avChat acceptAVChatCallWithUser: @”6”
                          callID:@"474a3e0baf0e3db251a2bc2a6a5b31a5"
                         success:^(NSDictionary * response) {
                       } failure:^(NSError * error) {
}];

4. Start audio video call
Start an audio-video call within the container view. This function has to be called after sending/accepting audio-video call request only. (Ensure that userID specified here should be the same while sending/accepting the request and also userID cannot be nil or empty)

- (void)startAVChatCallWithUser:(NSString *)userID
                inContainerView:(UIView *)container
                        failure:(void(^)(NSError * error))failure;

Return type: void
Callback Blocks:
(i). (void(^)(NSError *error))failure
Invocation: If an error occurs while starting audio video call request.
Response: NSError containing error code and message.
Usage:

[avChat startAVChatCallWithUser:@”6”
                inContainerView:containerView
                        failure:^(NSError * error) {
}];

5. End call
End audio-video call with the user corresponding to userID specified. (Ensure that userID specified should be same as given when starting the audio-video call and also userID cannot be nil or empty)

- (void)endAVChatCallWithUser:(NSString *)userID
                      success:(void(^)(NSDictionary * response)) response
                      failure:(void(^)(NSError * error)) failure;

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After ending audio video call successfully.
Response: NSDictionary containing id of the user with whom audio video call has been ended.
Eg:

{  
 callID = 474a3e0baf0e3db251a2bc2a6a5b31a5;
 userID = 6;
}

(ii). (void(^)(NSError *error))failure
Invocation: If an error occurs while ending audio video call request
Response: NSError containing error code and message
Usage:

[avChat endAVChatCallWithUser:@”6”
                      success:^(NSDictionary* response) {
                     }failure:^(NSError* error) {
}];

6. Cancel call
Cancel audio-video call after sending a call request. (Ensure that userID specified should be same as given when sending the audio-video call request and also userID cannot be nil or empty)

- (void)cancelAVChatCallWithUser:(NSString *)userID
                         success:(void(^)(NSDictionary *response))response
                         failure:(void(^)(NSError *error))failure;

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After cancelling audio video call successfully
Response: NSDictionary containing id of the user with whom audio video call has been cancelled
Eg:

{  
  userID = 6;
}

(ii). (void(^)(NSError *error))failure
Invocation: If an error occurs while cancelling audio video call request
Response: NSError containing error code and message
Usage:

[avChat cancelAVChatCallWithUser:@”6”
                         success:^(NSDictionary *response) {
                        }failure:^(NSError *error) {
}];

7. Send busy call
Send busy call when AVCHAT_INCOMING_CALL_USER_BUSY message is received in the onAVChatMessageReceived callback block. (Ensure that userID specified should be same as the userID received in AVCHAT_INCOMING_CALL_USER_BUSY message and also userID cannot be nil or empty)

- (void)sendBusyCallToUser:(NSString * )userID
                   success:(void(^)(NSDictionary *response))response
                   failure:(void(^)(NSError *error)) failure;

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After sending busy call successfully.
Response: NSDictionary containing id of the user to whom busy tone has been sent
Eg:

{  
  userID = 6;
}

(ii). (void(^)(NSError *error))failure
Invocation: If an error occurs while sending busy tone
Response: NSError containing error code and message
Usage:

[avChat sendBusyCallToUser:@”6”
                   success:^(NSDictionary * response) {
                  }failure:^(NSError * error) {
}];

8. Reject call
Reject audio-video call request when AVCHAT_INCOMING_CALL message is received in the onAVChatMessageReceived callback block. (Ensure that userID specified should be same as the userID received in AVCHAT_INCOMING_CALL message and also userID cannot be nil or empty)

- (void)rejectAVChatCallWithUser:(NSString *)userID
                         success:(void(^)(NSDictionary *response))response
                         failure:(void(^)(NSError *error))failure;

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After rejecting audio video call successfully
Response: NSDictionary containing id of the user whose incoming audio video call request has been
rejected
Eg:

{  
 callID = 474a3e0baf0e3db251a2bc2a6a5b31a5; 
 userID = 5;
}

(ii). (void(^)(NSError *error))failure
Invocation: If an error occurs while sending busy tone
Response: NSError containing error code and message
Usage:

[avChat rejectAVChatCallToUser:@”5”
                       success:^(NSDictionary * response) {
                      }failure:^(NSError * error) {
}];

9. Toggle Audio to ON(YES) or OFF(NO) state

- (void)toggleAudio:(BOOL)audioControlFlag;

Return type: void
Usage:

[avchat toggleAudio:YES];

10. Toggle Video to ON(YES) or OFF(NO) state

- (void)toggleVideo:(BOOL)videoControlFlag;

Return type: void
Usage:

[avchat toggleVideo:YES];

11. Switch between front and rear camera in a Video call

- (void)switchCamera;

Return type: void
Usage:

[avchat switchCamera];

Please refer ‎error codes for failure responses.