Kinesis video putmedia for iOS

[PaulIPS]

State your question
Hi how do you do a put media request to Kinesis using the iOS SDK?. I can't seam to find any reference code after getting the endpoint URL from getDataEndpoint.

I see in the android SDK there is a PutMediaClient.builder() but I can't seam to find something similar in the iOS SDK.

Which AWS Services are you utilizing?
Kinesis Video

Environment:

• SDK Version: 2.13
• Dependency Manager: Cocoapods
• Swift Version : 4.0

Device Information:

• Device: iPad
• iOS Version: 13.1.3

[wooj2]

Hi @PaulScala,

Thanks for reaching out. I'm not super familiar with this part of the SDK, but it seems like there is a unit tests here named "testGetHlsStreamingSessionUrl"

aws-sdk-ios/AWSKinesisVideoTests/AWSKinesisVideoTests.swift

Line 66 in 655e13b

func testGetHlsStreamingSessionUrl() {

Perhaps changing line 84 from:

aws-sdk-ios/AWSKinesisVideoTests/AWSKinesisVideoTests.swift

Line 84 in 655e13b

getDataEndpointRequest?.apiName = AWSKinesisVideoAPIName.getHlsStreamingSessionUrl

to something like:

            getDataEndpointRequest?.apiName = AWSKinesisVideoAPIName.putMedia

might be what you're looking for?

[PaulIPS]

@wooj2 Thank you for the suggestion.

The problem is kvClient.getDataEndpoint() just returns a url string. I can't seam to find any methods in the iOS SDK related to actually pushing data to that URL.

Here is the object the API returns:

@interface AWSKinesisVideoGetDataEndpointOutput : AWSModel

/**
 <p>The endpoint value. To read data from the stream or to write data to it, specify this endpoint in your application.</p>
 */
@property (nonatomic, strong) NSString * _Nullable dataEndpoint;

@end

[wooj2]

Hey @PaulScala ,

I checked around with people more familiar with this area, and they said that there is currently no easy way to support this at the moment.

They suggested two potential options with moving forward:

1. You could use the iOS AWS mobile SDK components to get the endpoint and then use custom logic to get the frames from the camera/device, encode it, package it into MKV and use a NSURL type of client to issue SigV4 signed request to PutMedia directly.

2. You can attempt to compile the C Producer SDK for iOS and use everything natively: https://github.com/awslabs/amazon-kinesis-video-streams-producer-c
   In this case you'd still be responsible for retrieving the frames from the device and encoding them.

Option one seems to be very involved, and it seems like option 2 does some of the heavy lifting for you.

Best of luck!

[PaulIPS]

Hi @wooj2 Thank you for following up on this. It looks like option 1 would be the best path forwards for us. Does the AWS iOS SDK have anything I can leverage for helping make a SigV4 request, or is it best to make my own REST layer.

[wooj2]

Hey @PaulScala ,

As part of AWSCore, there is AWSSignature which I believe should be of some help:
https://github.com/aws-amplify/aws-sdk-ios/blob/master/AWSCore/Authentication/AWSSignature.h

[PaulIPS]

Hey @wooj2 So I have been digging into the AWS core SDK trying to implement this, and I got a bit stuck.

My understanding is that to load data into a web request you need to use a request sterilizer. Since none of the request serializes take a data object in I have to create my own:

class AWSRawRequestSerializer: NSObject, AWSURLRequestSerializer {
    var data : Data
    
    init(data: Data) {
        self.data = data
    }
    
    func validate(_ request: URLRequest!) -> AWSTask<AnyObject>! {
        return AWSTask(result: nil)
    }
    
    func serializeRequest(_ request: NSMutableURLRequest!, headers: [AnyHashable : Any]!, parameters:
        [AnyHashable : Any]!) -> AWSTask<AnyObject>! {
        
        if headers != nil {
            for (key, value) in headers {
                request.addValue(value as! String, forHTTPHeaderField: key as! String)
            }
        }
        
        request.httpBody = self.data
        return AWSTask(result: nil)
    }
}

The problem I am having is when I set request.httpBody I then get back The request signature we calculated does not match the signature you provided .

any idea what I am missing? When I step step through the request the method signRequestV4 is being hit inside AWSSignature.

[ShahinOskouie]

Any updates on this topic? I have the same issue!

[atierian]

Thanks for opening this feature request. We don't plan on adding support for PutMedia at this time.