Play live streams registered with Google Cloud Video Stitcher API
This guide demonstrates how to use the IMA DAI SDK for tvOS to request and play a livestream for an event registered with the Google Cloud Video Stitcher API , and how to insert an ad break during playback.
This guide expands on the basic example from the Get started guide for IMA DAI.
For information on integrating with other platforms or on using the IMA client-side SDKs, see Interactive Media Ads SDKs .
If you would like to view or follow along with a completed sample integration, download the Cloud video stitcher example for Objective-C or Swift .
Set up a Google Cloud project
Enter the following variables for use in the IMA SDK:
- Location
- The Google Cloud region
where your live config was created:
LOCATION - Project number
- The Google Cloud project number using the Video Stitcher API:
PROJECT_NUMBER - OAuth token
-
A service account's short lived OAuth token with the Video Stitcher user role:
OAUTH_TOKEN
-
Read more about creating short-lived credentials for service accounts . The OAuth token can be reused across multiple requests as long as it has not expired.
- Network code
-
The Ad Manager network code for requesting ads:
NETWORK_CODE
- Live config ID
- The live config ID you specified when creating your livestream event:
LIVE_CONFIG_ID - Custom asset key
- The Ad Manager custom asset key generated during the process of creating a
configuration for a livestream event
with the Video Stitcher API:
CUSTOM_ASSET_KEY
Download and prepare the basic example
Download the IMA DAI examples for tvOS and extract the Basic Example into a new folder. This example is an Xcode project that relies on Cocoapods to load the IMA SDK.
To prepare the sample to run, make sure CocoaPods is installed , then open the basic example's folder in the terminal and run the following command:
pod
install
--repo-update
Once that command completes, you see a file named BasicExample.xcworkspace
in
your project folder. Open this file in Xcode and run the sample to ensure that
the test video and ads play as expected.
Request a livestream
To replace the sample stream with your livestream, you need to use the IMAVideoStitcherLiveStreamRequest
class that automatically creates an ad
session with Google Ad Manager. You can use the Google Ad Manager UI to locate
the generated DAI sessions
for
monitoring and debugging purposes.
In the existing sample, there are examples for requesting a VOD stream or a
livestream from Google's DAI servers. To make the sample work with the Google
Cloud Video Stitcher API, you will need to replace the current requestStream
function with one that uses the IMAVideoStitcherLiveStreamRequest
class:
ViewController.m
#import <GoogleInteractiveMediaAds/GoogleInteractiveMediaAds.h>
static
NSString
*
const
kLiveConfigId
=
@" LIVE_CONFIG_ID
"
;
static
NSString
*
const
kLocation
=
@" LOCATION
"
;
static
NSString
*
const
kProjectNumber
=
@" PROJECT_NUMBER
"
;
static
NSString
*
const
kOAuthToken
=
@" OAUTH_TOKEN
"
;
static
NSString
*
const
kNetworkCode
=
@" NETWORK_CODE
"
;
static
NSString
*
const
kCustomAssetKey
=
@" CUSTOM_ASSET_KEY
"
;
static
NSString
*
const
kBackupStreamURLString
=
@"http://googleimadev-vh.akamaihd.net/i/big_buck_bunny/bbb-,480p,720p,1080p,.mov.csmil/"
@"master.m3u8"
;
@interface
ViewController
()
< IMAAdsLoaderDelegate
,
IMAStreamManagerDelegate
> ...
-
(
void
)
requestStream
{
IMAAVPlayerVideoDisplay
*
videoDisplay
=
[[
IMAAVPlayerVideoDisplay
alloc
]
initWithAVPlayer
:
self
.
playerViewController
.
player
];
IMAAdDisplayContainer
*
adDisplayContainer
=
[[
IMAAdDisplayContainer
alloc
]
initWithAdContainer
:
self
.
adContainerView
];
IMAVideoStitcherLiveStreamRequest
*
request
=
[[
IMAVideoStitcherLiveStreamRequest
alloc
]
initWithLiveStreamEventID
:
kLiveConfigId
region
:
kLocation
projectNumber
:
kProjectNumber
OAuthToken
:
kOAuthToken
networkCode
:
kNetworkCode
customAssetKey
:
kCustomAssetKey
adDisplayContainer
:
self
.
adDisplayContainer
videoDisplay
:
self
.
videoDisplay
userContext
:
nil
,
videoStitcherSessionOptions
:
nil
];
[
self
.
adsLoader
requestStreamWithRequest
:
request
];
}
(Optional) Add streaming session options
Customize your stream request by adding session options to override the default
Cloud Video Stitcher API configuration by populating the videoStitcherSessionOptions
parameter in your IMAVideoStitcherLiveStreamRequest
.
If you provide an unrecognized option, the Cloud
Video Stitcher API will respond with an HTTP 400 error. Consult the troubleshooting guide
for assistance.
For example, you can override the manifest options with the following code snippet, which requests two stream manifests with renditions ordered from lowest bitrate to highest.
Objective-C
// Define session options JSON string.
// The following session options are examples. Use session options
// that are compatible with your video stream.
NSString
*
sessionOptionsStr
=
@"{"
"
\"
manifestOptions
\"
: {"
"
\"
bitrateOrder
\"
:
\"
ascending
\"
"
" }"
"}"
;
// convert JSON NSString to NSDictionary
NSData
*
sessionOptionsData
=
[
sessionOptionsStr
dataUsingEncoding
:
NSUTF8StringEncoding
];
NSError
*
error
=
nil
;
NSDictionary
*
sessionOptions
=
[
NSJSONSerialization
JSONObjectWithData
:
sessionOptionsData
options
:
0
error
:
& error
];
// make stream request
IMAVideoStitcherLiveStreamRequest
*
streamRequest
=
[[
IMAVideoStitcherLiveStreamRequest
alloc
]
initWithLiveStreamEventID
:
kLiveConfigID
region
:
kLocation
projectNumber
:
kProjectNumber
OAuthToken
:
kOAuthToken
networkCode
:
kNetworkCode
customAssetKey
:
kCustomAssetKey
adDisplayContainer
:
adDisplayContainer
videoDisplay
:
imaVideoDisplay
userContext
:
nil
videoStitcherSessionOptions
:
sessionOptions
];
[
self
.
adsLoader
requestStreamWithRequest
:
streamRequest
];
Swift
// Define session options JSON string.
// The following session options are examples. Use session options
// that are compatible with your video stream.
let
sessionOptionsStr
=
"""
{
"
manifestOptions
"
: {
"
bitrateOrder
"
:
"
ascending
"
}
}
"""
// convert JSON string to dictionary
guard
let
sessionOptionsData
=
sessionOptionsStr
.
data
(
using
:
.
utf8
,
allowLossyConversion
:
false
)
else
{
return
nil
}
let
sessionOptions
=
try
?
JSONSerialization
.
jsonObject
(
with
:
sessionOptionsData
,
options
:
.
mutableContainers
)
// make stream request
let
streamRequest
=
IMAVideoStitcherLiveStreamRequest
(
liveStreamEventID
:
ViewController
.
liveConfigID
region
:
ViewController
.
location
projectNumber
:
ViewController
.
projectNumber
OAuthToken
:
ViewController
.
oAuthToken
networkCode
:
ViewController
.
networkCode
customAssetKey
:
ViewController
.
customAssetKey
adDisplayContainer
:
adDisplayContainer
videoDisplay
:
imaVideoDisplay
userContext
:
nil
videoStitcherSessionOptions
:
sessionOptions
)
adsLoader
?.
requestStream
(
with
:
streamRequest
)
Run the project, then you can request and play your custom livestream.
Insert an ad break
The Google Cloud Video Stitcher API inserts ads retrieved from the ad tag for each ad break. Ad breaks are denoted in the manifest using ad markers. Ad markers are inserted by the live stream encoder.
-
If you are using your own live stream, you need to insert the ad marker. For more information on the supported HLS and DASH ad markers, see the ad markers documentation .
-
If you created a live stream using the Google Cloud Livestream API, insert an ad break channel event .
The ad is played immediately after the ad break is inserted.
Clean up
Now that you have successfully hosted a live stream using the Google Cloud Video Stitcher API and requested it using the IMA DAI SDK for tvOS, it's important to clean up any serving resources.
Follow the livestream clean up guide to remove any unneeded resources and assets.
