com.webos.media

API Summary

Provides access to the functionality provided by the webOS media server. The webOS media server supports both managed and unmanaged pipelines. For managed pipelines, com.webos.media provides high-level methods to control the playback of media content (e.g. load, play, seek). For unmanaged pipelines, com.webos.media provides low-level methods for resource management and display control.

Direct use of com.webos.media by application developers is strongly discouraged. Instead, the media interfaces native to a particular application framework (e.g. Web, QT, SDL/NDL) should be used.

Overview of the API

See Summary.

Methods

load

ACG: media.operation

Description

Loads a new pipeline for the specified URI. The media server returns a unique id to the client which is used for subsequent operations on the pipeline.

Parameters

Name	Required	Type	Description
uri	Required	String	Indicates the uri of the media object. Example: http://mymovie.mp4, file://mymovie.mp4
type	Required	String	Indicates the type of pipeline to load. Note: Currently, media playback pipeline is supported. The media server also supports run-time installation of additional pipelines which is outside the scope of this API document. type : "camera" supported for Open / Auto to preview the supported USB camera
payload	Optional	Object: payload	See "payload" object.

Name

Required

Type

Description

uri

Required

String

Indicates the uri of the media object.

Example: http://mymovie.mp4, file://mymovie.mp4

type

Required

String

Indicates the type of pipeline to load.

Note:

Currently, media playback pipeline is supported.
The media server also supports run-time installation of additional pipelines which is outside the scope of this API document.
type : "camera" supported for Open / Auto to preview the supported USB camera

payload

Optional

Object: payload

See "payload" object.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	Number	The error code for the operation. Note: Currently, it returns '0' even when the returnValue is true and returns '-1' if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media/camera pipeline which is used for subsequent operations.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/load '{
   "uri":"https://media.w3.org/2010/05/sintel/trailer.mp4",
   "type":"media",
   "payload":{
      "option":{
         "appId":"com.webos.app.enactbrowser",
"windowId":"_Window_Id_2"
      }
   }
}'

Response:

{
   "errorCode":0,
   "returnValue":true,
   "errorText":"No Error",
   "mediaId":"_Pvzj2FRn42sL99"
}

Example: Load camera with System V shared memory

# luna-send -n 1 luna://com.webos.media/load '{
"uri":"camera://com.webos.service.camera2/7010",
"payload":{
"option":{
"appId":"com.webos.app.mediaevents-test",
"windowId":"_Window_Id_1",
"videoDisplayMode":"Textured",
"width":640,
"height":480,
"format":"JPEG",
"frameRate":30,
"memType":"shmem",
"memSrc":"7010"
}
},
"type":"camera"
}'

Response:

{
"errorCode":0,
"returnValue":true,
"errorText":"No Error",
"mediaId":"_puV0o3WTEsbgDt"
}

Note: For Open Emulator, while executing the luna-send command directly in console, send "windowId" as empty. The first frame of camera data directly displays on the emulator window.

Example : Load camera with Posix shared memory

"handle":4286
}
},
"type":"camera"
}'

Response:

{
"errorCode":0,
"returnValue":true,
"errorText":"No Error",
"mediaId":"_puV0o3WTEsbgDt"
}

Note: For Open Emulator, while executing the luna-send command directly in console, send "windowId" as empty. The first frame of camera data directly displays on the emulator window.

Example : Load camera with MMAP mode

Response:

{
"errorCode":0,
"returnValue":true,
"errorText":"No Error",
"mediaId":"_puV0o3WTEsbgDt"
}

Note: For Open Emulator, while executing the luna-send command directly in console, send "windowId" as empty. The first frame of camera data directly displays on the emulator window.

Example : Load camera with DMABUF mode

"iomode":2
}
},
"type":"camera"
}'

Response:

{
"errorCode":0,
"returnValue":true,
"errorText":"No Error",
"mediaId":"_puV0o3WTEsbgDt"
}

unload

ACG: media.operation

Description

Unloads the pipeline and releases all AV resources.

Parameters

Name	Required	Type	Description
mediaId	Required	String	Indicates the unique identifier of the loaded media/camera pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	String	The error code for the operation. Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media/camera pipeline which is requested to unload.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/unload '{"mediaId":"_Pvzj2FRn42sL99"}'

Response:

{
"errorCode":0,
"returnValue":true,
"errorText":"No Error",
"mediaId":"_Pvzj2FRn42sL99"
}

notifyForeground

ACG: media.operation

Description

Marks a pipeline as foreground. This API is called when the media object in question is un-carded and made visible.

Note: Foreground pipeline video content is currently visible on the display surface.

Parameters

Name	Required	Type	Description
connectionId	Required	String	Indicates the unique identifier of the registered pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed. Note: The notifyForeground method may fail because of: Command sent with wrong JSON format. Missing connectionId (required field). Unexisting connectionId.
errorCode	Optional	Number	The error code for the failed operation.
errorText	Optional	String	Indicates the reason for the failure of the operation.

Name

Required

Type

Description

returnValue

Required

Boolean

Indicates the status of the operation.

Possible values are:

true: Indicates that the operation was successful.
false: Indicates that the operation failed.

Note: The notifyForeground method may fail because of:

Command sent with wrong JSON format.
Missing connectionId (required field).
Unexisting connectionId.

errorCode

Optional

Number

The error code for the failed operation.

errorText

Optional

String

Indicates the reason for the failure of the operation.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/notifyForeground '{
"connectionId":"_z6SJt11Yx0mVp1"
}'

Response:

{
"returnValue":true
}

notifyBackground

ACG: media.operation

Description

Marks a pipeline as background. This API is called when the media object in question is carded, deleted, or otherwise removed from view.

Note: Background video content is not currently visible on the display surface.

Parameters

Name	Required	Type	Description
connectionId	Required	String	Indicates the unique identifier of the registered pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed. Note: The notifyBackground method may fail because of: Command sent with wrong JSON format. missing connectionId (required field). Unexisting connectionId.
errorCode	Optional	Number	The error code for the failed operation.
errorText	Optional	String	Indicates the reason for the failure of the operation.

Name

Required

Type

Description

returnValue

Required

Boolean

Indicates the status of the operation.

Possible values are:

true: Indicates that the operation was successful.
false: Indicates that the operation failed.

Note: The notifyBackground method may fail because of:

Command sent with wrong JSON format.
missing connectionId (required field).
Unexisting connectionId.

errorCode

Optional

Number

The error code for the failed operation.

errorText

Optional

String

Indicates the reason for the failure of the operation.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/notifyBackground '{
"connectionId":"_c5zE4w2k7rqmC5"
}'

Response:

{
"returnValue": true
}

ACG: media.operation

Description

Subscribes the media client to receive events from a media pipeline. These events, described in the tables above, allow the media client (generally an app or test tool) to monitor pipeline status (including playback position) and adjust their internal state appropriately.

Parameters

Name	Required	Type	Description
mediaId	Required	String	Indicates the unique identifier of the loaded media/camera pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Optional	Number	The error code for the operation Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Optional	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media pipeline which is requested to subscribe.
subscription	Optional	String	Indicates the current subscription status. Possible values are: true: Subscription is ON false: Subscription is OFF

Example

Example code

# luna-send -n 2 -f luna://com.webos.media/subscribe '{
"mediaId":"_rTNwzp81clPsxX"
}'

Response:

{
"subscription": true
}
{
"errorCode": 0,
"returnValue": true,
"errorText": "No Error",
"mediaId": "_rTNwzp81clPsxX"
}

attach

ACG: media.operation

Description

Allows to transfer the control of a pipeline to be handed over to a different client. When this occurs, the original client gets notified that it got detached from the pipeline and can no longer control the pipeline.

Note: This method was added to address a specific early boot situation where the pipeline was initially created by one client process and then another client process takes over control of the pipeline.

Parameters

Name	Required	Type	Description
mediaId	Required	String	Indicates the unique identifier of the loaded media/camera pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	Number	The error code for the operation Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media pipeline which is requested to subscribe.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/attach '{
"mediaId":"_IsGbw614gu7xRB"
}'

Response:

{
   "errorCode":0,
   "returnValue":true,
   "errorText":"No Error",
   "mediaId":"_IsGbw614gu7xRB"
}

play

ACG: media.operation

Description

Requests the media server to play the media object.

Parameters

Name	Required	Type	Description
mediaId	Required	String	Indicates the unique identifier of the loaded media/camera pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	Number	The error code for the operation. Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media/camera pipeline which is requested to play.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/play '{"mediaId":"_IsGbw614gu7xRB"}'

Response:

{
   "errorCode":0,
   "returnValue":true,
   "errorText":"No Error",
   "mediaId":"_IsGbw614gu7xRB"
}

pause

ACG: media

Description

Requests the media server to pause the media object.

Parameters

Name	Required	Type	Description
mediaId	Required	String	Indicates the unique identifier of the loaded media/camera pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	Number	The error code for the operation Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media/camera pipeline which is requested to pause.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/pause '{
"mediaId":"_IsGbw614gu7xRB"
}'

Response:

{
   "errorCode":0,
   "returnValue":true,
   "errorText":"No Error",
   "mediaId":"_IsGbw614gu7xRB"
}

seek

ACG: media.operation

Description

Seeks the media object to a specified time position.

Parameters

Name	Required	Type	Description
position	Required	Number	Indicates the position (in milliseconds) from the start position to seek position.
mediaId	Required	String	Indicates the unique identifier of the loaded media/camera pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	Number	The error code for the operation. Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media pipeline which is requested to seek.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/seek '{
"position":64935,
"mediaId":"_IsGbw614gu7xRB"
}'

Response:

{
   "errorCode":0,
   "returnValue":true,
   "errorText":"No Error",
   "mediaId":"_IsGbw614gu7xRB"
}

registerPipeline

ACG: media.operation

Description

Registers with the Resource Manager. Session is persistent across all start/end transaction and acquire/release cycles. Registered clients and their current resource requirements will be tracked by Resource Manager. Param type as specified in Resource Manager configuration file pipeline settings.

Note: This method is applicable for unmanaged pipelines only. For managed pipelines, this is taken care of internally by the mediaserver.

Parameters

Name	Required	Type	Description
type	Required	String	Indicates the type of pipeline to register. Possible values are: "ref" "media" "sim"
appId	Optional	String	Application ID

Name

Required

Type

Description

type

Required

String

Indicates the type of pipeline to register.

Possible values are:

"ref"
"media"
"sim"

appId

Optional

String

Application ID

Call Returns

Name	Required	Type	Description
connectionId	Required	String	Indicates the unique identifier of the registered pipeline.
returnValue	Optional	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Optional	Number	The error code for the failed operation.
errorText	Optional	String	Indicates the reason for the failure of the operation.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/registerPipeline '{
"type":"media"
}'

Response:

{
"connectionId": "_KXpMET1Sxc1eGO"
}

unregisterPipeline

ACG: media.operation

Description

Unregisters pipeline with Resource Manager.

Note: This method is applicable to unmanaged pipelines only.

Parameters

Name	Required	Type	Description
connectionId	Required	String	Indicates the unique identifier of the pipeline to unregister.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	Number	The error code for the operation. Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media pipeline which is requested.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/unregisterPipeline '{
"connectionId":"_KXpMET1Sxc1eGO"
}'

Response:

{
   "errorCode": 0,
   "returnValue": true,
   "errorText": "No Error",
   "mediaId": "_KXpMET1Sxc1eGO"
}

acquire

ACG: media.operation

Description

Requests resources from the mediaserver. Typical usage is to request the number of audio and video decoders or other hardware components used by the pipeline. Acquire calls can be used to dynamically add more resources to the pipeline. This allows the pipeline to dynamically grow or shrink without monopolizing the resources from startup. Each time a resource is acquired, the indexes of the newly acquired resources are included in the acquireComplete event.

Note:

The types and quantities of resources available to be managed are specified in the file umediaserver_resource_config.txt.in file.
This file is customized for each hardware platform.
If required to satisfy the acquisition of requested resources, a policyAction may be issued to other pipelines, forcing them to release their resources.
For format and list of acquired resources see acquireComplete event.

Parameters

Name	Required	Type	Description
resources	Required	Object: resources	See "resources" object.
connectionId	Required	String	Indicates the unique identifier of the pipeline to acquire resources.

Call Returns

Name	Required	Type	Description
returnValue	Required	String	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Optional	Number	The error code for the failed operation.
errorText	Optional	String	Indicates the reason for the failure of the operation.

Name

Required

Type

Description

returnValue

Required

String

Indicates the status of the operation.

Possible values are:

true: Indicates that the operation was successful.
false: Indicates that the operation failed.

errorCode

Optional

Number

The error code for the failed operation.

errorText

Optional

String

Indicates the reason for the failure of the operation.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/acquire '{
"resources": "[{\"resource\":\"DISP0\",\"qty\":1}, {\"resource\":\"VDEC\",\"qty\":1},{\"resource\":\"ADEC\",\"qty\":1}]",
"connectionId": "_UZRkgE3EJgXvwl"
}'

Response:

{
"returnValue": true
}

acquireComplete

{
   "resources": [{
       "qty": 1,
       "resource": "ADEC",
       "index": 3
   }, {
       "qty": 1,
       "resource": "VDEC",
       "index": 3
   }, {
       "qty": 1,
"resource": "DISP0",
       "index": 3
   }],
   "state": true,
   "connectionId": "_UZRkgE3EJgXvwl"
}

tryAcquire

ACG: media.operation

Description

Tries to acquire resources from mediaserver.

Note:

This API will not issue policyAction to other pipelines in order to force them to release resources.
If there are insufficient resources to honor the request without issuing a policyAction, the request will fail.

Parameters

Name	Required	Type	Description
resources	Required	Object: resources	See "resources" object.
connectionId	Required	String	Indicates the unique identifier of the pipeline to acquire resources.

Call Returns

Name

Required

Type

Description

returnValue

Required

Boolean

Indicates the status of the operation.

Possible values are:

true: Indicates that the operation was successful.
false: Indicates that the operation failed.

errorCode

Optional

Number

The error code for the failed operation.

errorText

Optional

String

Indicates the reason for the failure of the operation.

Example

Example code

# luna-send -n 1 luna://com.webos.media/tryAcquire '{
"resources": "[{\"resource\":\"DISP0\",\"qty\":1},{\"resource\":\"VDEC\",\"qty\":1},{\"resource\":\"ADEC\",\"qty\":1}]",
"connectionId": "_7P3y7e9AcPv8t1"
}'

Response:

{
"returnValue": true
}

acquireComplete

{
   "resources": [{
       "qty": 1,
       "resource": "ADEC",
       "index": 3
   }, {
       "qty": 1,
       "resource": "VDEC",
       "index": 3
   }, {
       "qty": 1,
       "resource": "DISP0",
       "index": 3
   }],
   "state": true,
   "connectionId": "_7P3y7e9AcPv8t1"
}

release

ACG: media.operation

Description

Informs media server the resources are released correctly and are not being used anymore.

Note: This method is applicable for unmanaged pipelines only.

Parameters

Name	Required	Type	Description
resources	Required	Object: resources	See "resources" object.
connectionId	Required	String	Indicates the unique identifier of the pipeline to release resources.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of operation. Possible values are: true: For released resources. false: For malformed request.
errorCode	Optional	Number	The error code for the failed operation.
errorText	Optional	String	Indicates the reason for the failure of the operation.

Name

Required

Type

Description

returnValue

Required

Boolean

Indicates the status of operation. Possible values are:

true: For released resources.
false: For malformed request.

errorCode

Optional

Number

The error code for the failed operation.

errorText

Optional

String

Indicates the reason for the failure of the operation.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/release '{
"resources":"[{\"resource\":\"DISP0\",\"qty\":1,\"index\":3},{\"resource\":\"VDEC\",\"qty\":1,\"index\":3},{\"resource\":\"ADEC\",\"qty\":1,\"index\":3}]",
"connectionId":"_QY7tkX1XEfBct3"
}'

Response:

{
"returnValue": true
}

notifyActivity

ACG: media.operation

Description

Notifies the media server that the specific pipeline is currently in use. This command raises the timestamp record of the corresponding pipeline to lessen the chance to be picked as the target for a policyAction, which would require the pipeline to release its resources.

Parameters

Name	Required	Type	Description
connectionId	Required	String	Indicates the unique identifier of the registered pipeline.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: For released resources. false: For malformed request.
errorCode	Optional	Number	The error code for the failed operation.
errorText	Optional	String	Indicates the reason for the failure of the operation.

Name

Required

Type

Description

returnValue

Required

Boolean

Indicates the status of the operation.

Possible values are:

true: For released resources.
false: For malformed request.

errorCode

Optional

Number

The error code for the failed operation.

errorText

Optional

String

Indicates the reason for the failure of the operation.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/notifyActivity '{
"connectionId":"_EYv0VPazu3aGo0"
}'

Response:

{
"returnValue": true
}

trackAppProcesses

ACG: media.devutility

Description

Subscribes to messages containing the mapping of application ID (appID) and pipeline process ID (PID), i.e. it returns information about which application each managed pipeline belongs to.The subscription messages contain information about changes to these mappings, i.e. new mappings when a pipeline is associated with an application or destroyed mappings when a pipeline exits.

Note: The return value of the method contains an array of the PIDs of all currently existing pipelines mapped to the corresponding appIDs.

Parameters

None

Call Returns

Name	Required	Type	Description
subscribed	Required	Boolean	Returns true if the subscriber was successfully added.
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
mediaPipelines	Required	Object array: mediaPipelines	See "mediaPipelines" object.
subscription	Required	Boolean	Indicates the current subscription status. Possible values are: true: Subscription is ON false: Subscription is OFF

Subscription Returns

Name	Required	Type	Description
procUpdate	Required	Object: procUpdate	See "procUpdate" object.

Example

Example code

# luna-send -n 2 -f luna://com.webos.media/trackAppProcesses '{}'

Response:

{
"subscription": true
}

{
"subscribed": true,
"mediaPipelines": [
{
"appId": "com.webos.app.enactbrowser",
"pid": 1685
}
],
"returnValue": true
}

Subscription Response:

{
"procUpdate":{
"appId":"com.webos.app.enactbrowser",
"exec":false,
"pid":1685
}
}

unsubscribe

ACG: media.operation

Description

Unsubscribes from media pipeline related events.

Parameters

Name	Required	Type	Description
mediaId	Optional	String	Indicates the unique identifier of the media object to unsubscribe.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	Number	The error code for the operation. Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the loaded media pipeline requested to unsubscribe.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/unsubscribe '{
"mediaId":"_gmkaR0OtGWxr6z"
}'

Response:

{
"errorCode": 0,
"returnValue": true,
"errorText": "No Error",
"mediaId": "_gmkaR0OtGWxr6z"
}

getActivePipelines

ACG: media.query

Description

Gets JSON formatted output of currently active media pipelines.

Parameters

Name	Required	Type	Description
mediaId	Optional	String	Indicates unique identifier of the media object.

Call Returns

Name	Required	Type	Description
Id	Optional	String	Indicates unique identifier of the media object.
type	Optional	String	Indicates the type of media.
pid	Optional	Number (int16_t)	Indicates the process id of media content provider.
is_managed	Optional	Boolean	Indicates whether media Content Provider is a managed pipeline or not. true: Managed false: Not managed
is_foreground	Optional	Boolean	Indicates whether media object is currently in the foreground or not true: Media object is currently in the foreground false: Media object is currently in the background
mediaState	Optional	String	Indicates the current state of Media Content Provider. Possible values are: MEDIA_LOAD: Media is loaded and ready to play. MEDIA_UNLOAD: Media is unloaded. MEDIA_PLAY: Media is currently in play state. MEDIA_PAUSE: Media is in pause state. MEDIA_STOP: Media is in stop state.
policy_state	Optional	Boolean	Media is currently selected for Resource Management Policy Action and is in suspended state
uri	Optional	String	Indicate the uri of media object.
appId	Optional	String	Indicates the application id of application using media object.
processState	Optional	String	Indicates the status of the media content provider process. Possible values are: PIPELINE_STARTING: Media pipeline is starting but currently unable to process or respond to commands. PIPELINE_RESTARTING: Media pipeline is being restarted due to crash recovery or resume from Resource Manager Policy Action PIPELINE_RUNNING: Media pipeline is running and able to process and respond to commands. PIPELINE_MEDIA_LOADED: Media pipeline has loaded and valid media content. PIPELINE_SUSPENDED: Media pipeline has been suspended due to Resource Manager Policy Action.
is_focus	Optional	String	Indicates that the media object is currently selected for focus. Note: Focus is not the same thing as "visible".
timestamp	Optional	String	Indicates the timestamp of the last activity on Media Content Provider pipeline. Pipeline activity is used to adjust the Resource Manager Policy Action Candidate Selection Policy. Events which update pipeline activity are: PLAY SEEK LOAD notifyForeground notifyActivity
resources	Required	Object array: resources	See "resources" object.
mediaId	Optional	String	Indicates mediaId of the object.
errorCode	Optional	Number	The error code for the operation. Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Optional	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
returnValue	Optional	Boolean	Indicates the status of operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/getActivePipelines '{}'

Response:

[
{
"pid":1521,
"resources":[
{
"resource":"ADEC",
"index":3
},
{
"resource":"VDEC",
"index":3
}
],
"type":"media",
"id":"_IzddeO9d8fP1jO",
"is_managed":true,
"mediaState":"play",
"is_foreground":true,
"policy_state":0,
"uri":"http://media.w3.org/2010/05/sintel/trailer.mp4",
"appId":"com.webos.app.enactbrowser",
"processState":"media_loaded",
"is_focus":false,
"timestamp":1423867226706,
"mediaId":"_IzddeO9d8fP1jO"
}
]

setVolume

ACG: media.operation

Description

Sets the volume for the specified media object. Additionally, it specifies the ease (fade-in and fade-out) properties for the media object.

Parameters

Name	Required	Type	Description
mediaId	Required	String	Unique identifier of the media object.
volume	Required	Number	The volume to be set. Can be set to any value between 0 and 100.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. true: Indicates success of the operation. false: Indicates failure in the operation. Errors with the arguments will be provided in the logs.
errorCode	Required	Number	The error code for the operation. Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Unique identifier of the media object.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/setVolume '{"mediaId":"_IsGbw614gu7xRB","volume":60}'

Response:

{
   "errorCode":0,
   "returnValue":true,
   "errorText":"No Error",
   "mediaId":"_IsGbw614gu7xRB"
}

getForegroundAppInfo

ACG: media.query

Description

Provides the application's foreground information.

Parameters

None

Call Returns

Name

Required

Type

Description

returnValue

Required

Boolean

Indicates the status of the operation.

Possible values are:

true: Indicates that the operation was successful.
false: Indicates that the operation failed.

appId

Required

String

Indicates the application ID (appId).

acbs

Required

Object array: acbs

Contains an array of objects that gives details of the media. (pipeline ID, playstate, position and so on)

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/getForegroundAppInfo '{}'

Response:

{
"acbs":[
{
"positionY":0,
"playStateNow":"",
"width":0,
"height":0,
"isFullScreen":false,
"pipelineId":"",
"positionX":0,
"playStateNext":""
}
],
"appId":"com.webos.app.enactbrowser",
"returnValue":true
}

setPlayRate

ACG: media.operation

Description

Sets the pipeline media play rate.

Parameters

Name	Required	Type	Description
playRate	Required	Number (double)	Indicates the play back rate for the media.
mediaId	Required	String	Indicates the unique identifier for the requested loaded media pipeline.
audioOutput	Required	Boolean	Determine to mute audio

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed.
errorCode	Required	Number	The error code for the operation. Note: Currently, it returns 0 even when the returnValue is true and returns -1 if JSON parsing fails.
errorText	Required	String	Indicates the reason for the failure of the operation. Note: Currently, it returns "No Error" even when the returnValue is true. If JSON parsing fails, then errorText is updated accordingly.
mediaId	Optional	String	Indicates the unique identifier of the media object.

Example

Example code

# luna-send -n 1 -f luna://com.webos.media/setPlayRate '{
"playRate":2.0,
"mediaId":"_QnGGXr7BdWsOV1",
"audioOutput":true
}'

Response:

{
"errorCode": 0,
"returnValue": true,
"errorText": "No Error",
"mediaId": "_QnGGXr7BdWsOV1"
}

startCameraRecord

ACG: media.operation

Description

Starts camera recording. Camera pipeline stores streamed data from the camera and microphone (if required) at the specified location.

Parameters

Name	Required	Type	Description
location	Required	String	Indicates the path for storing the recorded file.
format	Required	String	Indicates the format in which data is stored. Possible values are: MP4 - file format MP4 ( .mp4) file gets generated
mediaId	Required	String	Indicates the unique identifier of the camera pipeline obtained using the load() API.
audio	Required	Boolean	Indicates whether the audio data from the microphone also has to be recorded along with video. Possible values are: true: Include audio data along with video false: Does not include audio data along with video
audioSrc	Required	String	Indicates the name of the microphone device from which the audio data has to be captured. Note: Supports only one audio source (pcm_input).

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCode	Optional	Number	The error code for the failed operation. Note: errorCode always defaults to 0. Details of the error will be available in the logs.
errorText	Optional	String	Indicates the reason for the failure of the operation. Note: errorText is always empty. Details of the error will be available in the logs.
mediaId	Required	String	Indicates the unique identifier of the camera pipeline.

Example

Example : Camera recording without audio

# luna-send -n 1 luna://com.webos.media/startCameraRecord '{
"mediaId" :"_5nxnM2Xiw55PYS" ,
"location":"/media/internal/",
"format" :"MP4",
"audio":false,
"audioSrc":"pcm_input"
}'

Example : Camera recording with audio

# luna-send -n 1 luna://com.webos.media/startCameraRecord '{
"mediaId" :"_5nxnM2Xiw55PYS" ,
"location":"/media/internal/",
"format" :"MP4",
"audio":true,
"audioSrc":"pcm_input"
}'

stopCameraRecord

ACG: media.operation

Description

Requests media server to stop camera recording and change to the preview state.

Parameters

Name	Required	Type	Description
mediaId	Required	String	Indicates the unique identifier of the camera pipeline obtained using the load() API.

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCode	Optional	Number	The error code for the failed operation. Note: errorCode always defaults to 0. Details of the error will be available in the logs.
errorText	Optional	String	Indicates the reason for the failure of the operation. Note: errorText is always empty. Details of the error will be available in the logs.
mediaId	Required	String	Indicates the unique identifier of the camera pipeline.

Example

Example code

# luna-send -n 1 luna://com.webos.media/stopCameraRecord '{"mediaId":"_JtLZrGoEAoRa1d"}'

takeCameraSnapshot

ACG: media.operation

Description

Captures a frame from the camera preview.

Parameters

Name	Required	Type	Description
mediaId	Required	String	Indicates the unique identifier of the camera pipeline which is obtained using the load() API.
location	Required	String	Indicates the path of the captured image to be stored.
format	Required	String	Indicates the format of the frame is to be captured. Possible values are: jpg
width	Required	Number	Indicates the width of the captured image in pixels. Note: Width should be within the range supported by the camera hardware.
height	Required	Number	Indicates the height of the captured image in pixels. Note: Height should be within the range supported by the camera hardware.
pictureQuality	Required	Number	Indicates the percentage of the picture quality. Possible values are: 0-100

Call Returns

Name	Required	Type	Description
returnValue	Required	Boolean	Indicates the status of the operation. Possible values are: true: Indicates that the operation was successful. false: Indicates that the operation failed. Check the "errorCode" and "errorText" fields for details.
errorCode	Optional	Number	The error code for the failed operation. Note: errorCode always defaults to 0. Details of the error will be available in the logs.
errorText	Optional	String	Indicates the reason for the failure of the operation. Note: errorText is always empty. Details of the error will be available in the logs.
mediaId	Required	String	Indicates the unique identifier the camera pipeline.

Example

Example code

# luna-send -n 1 luna://com.webos.media/takeCameraSnapshot '{
"mediaId":"",
"location":"/tmp/",
"format":"jpg",
"width":640,
"height":480,
"pictureQuality":30
}'

Objects

ResponseObject

Provides a detailed description of the object. Limit to 2-3 paragraphs.

Name	Required	Type	Description
returnValue	Optional	Boolean	Return value of command. Command succeeded true/false.
errorCode	Optional	Number	Error Code (if failure) of command.
errorText	Optional	String	Human readable and HMI/UX displayable text of reported error. If any.
mediaId	Optional	String	Media ID

resources

Object of resource name, quantity, and index.

Resources can hold more than one set of resource, quantity, and index.

Example:

{
   "resources": " [{
           "resource": "DISP0",
           "qty": 1,
           "index": 3,
},
       {
           "resource": "VDEC",
           "qty": 1,
           "index": 3
       },
       {
           "resource": "ADEC",
           "qty": 1,
           "index": 3
       }
   ]
}

Name	Required	Type	Description
resource	Required	String	Name of resource to acquire. Possible values are: VDEC: It describes source of video decoder ADEC: It describes source of audio decoder DISPX: It describes display resource. X represents a number corresponds to display starting with 0. If a device has more than one display, there can be multiple DISP resources(e.g., DISP0, DISP1). It only applied to Open.
qty	Optional	Number	Quantity of resource to acquire.
index	Optional	Number	Specific index of resource to acquire.

Name

Required

Type

Description

resource

Required

String

Name of resource to acquire.

Possible values are:

VDEC: It describes source of video decoder
ADEC: It describes source of audio decoder
DISPX: It describes display resource. X represents a number corresponds to display starting with 0. If a device has more than one display, there can be multiple DISP resources(e.g., DISP0, DISP1). It only applied to Open.

qty

Optional

Number

Quantity of resource to acquire.

index

Optional

Number

Specific index of resource to acquire.

videoInfo

Provides information related to video.

Name	Required	Type	Description
width	Required	Number (uint32_t)	Actual width value of input video (before cropping in video decoder. Used for UI presentation.)
height	Required	Number (uint32_t)	Actual height value of input video (before cropping in video decoder. Used for UI presentation.)
frameRate	Required	Object: frameRate	See "frameRate" object.
codec	Optional	String	Codec information.
bitRate	Optional	Number (uint64_t)	Bit rate value of content.

frameRate

Provides information about the number of frames per second at which the video is being played.

It is represented as a combination of numerator and denominator.

Name	Required	Type	Description
num	Required	Number (int32_t)	Numerator of frame rate
den	Required	Number (int32_t)	Denominator of frame rate

audioInfo

Provides information related to audio.

Name	Required	Type	Description
codec	Optional	String	Codec information
bitrate	Optional	Number (int64_t)	Bit rate value of content.
sample_rate	Optional	Number (int32_t)	Samples of audio carried per second, measured in kHz.

mediaPipelines

Contains the AppID-PID mapping of the currently running pipelines. Returns an empty array if no pipelines associated with any applications.
Each array element is an object of type {"appId": string, "pid": number}. If the appId string is empty it means the pipeline was loaded without an application ID being provided.

Name	Required	Type	Description
appId	Required	String	Indicates application id
pid	Required	Number	Indicates process id of pipeline

procUpdate

The procUpdate object value is an object of type: {"appId" : string, "exec" : bool, "pid" : number}
where exec is true when a pipeline appid mapping is added and false when it is destroyed.
If the appId string is empty it means the pipeline was loaded without an application ID being provided.

Name

Required

Type

Description

appId

Required

String

Indicates application ID.

pid

Required

Number

Indicates process ID of pipeline.

exec

Required

Boolean

Provides information on the mapping status of app ID and a pipeline. Possible values are:

true: when a pipeline app ID mapping is added
false: when a pipeline app ID mapping is destroyed.

payload

Payload format used in load API. It represents the JSON payload object for a specific type of pipeline.

Name	Required	Type	Description
option	Optional	Object: option	See "option" object.

option

Provides parameters used in the load/preload API.

Name	Required	Type	Description
appId	Required	String	Indicates the application id.
windowId	Required	String	Indicates the windowId attached to the video sink. The value should be specified in the format: "_Window_Id_X" (X is number). Note: The value should be given by the surface manager before the load API is called.
videoDisplayMode	Optional	String	Indicates the display mode of the pipeline. Default: Textured Note: Only Textured value is supported.
display-path	Optional	Number	Indicates the display path. Default: 0 Note: Multiple values can be supported if a device has multiple screens (i.e., 0 for primary display, 1 for secondary display). It is only applicable to Open.
width	Optional	Number	Indicates the width of the image to be taken from the camera device. The value can vary from supported width of the image. Note: This is required when load API is used for the camera.
height	Optional	Number	Indicates the height of the image to be taken from the camera device. The value can vary from supported height of the image. Note: This is required when the load API is used for the camera.
format	Optional	String	Indicates the type of the camera data to be taken from the camera device. Possible values are: JPEG YUY2 Note: This is required when the load API is used for the camera.
frameRate	Optional	Number	Indicates the number of frames captured per sec from a camera device. Based on the camera supported values, provide the frameRate such as 30 / 15 and so on. Note: This is required when the load API is used for the camera.
memType	Optional	String	Indicates the type of access with camera device. Possible values are: device shmem posixshm Note: This is required when the load API is used for the camera.
memSrc	Optional	String	Indicates the source of the camera data. Possible value: Device node like "/dev/video0" / shared memory key "7010" ( which is returned by camera service ). Note: This is required when the load API is used for the camera.
handle	Optional	Number	Indicates the handle for the device obtained using the open() API of camera service. This parameter is required only when "memType" is "posixshm" for camera functionality.
iomode	Optional	Number	Represents the memory mode value which are defined using an enum like mmap, user pointer & dma buffer, when "memType" is "device" for camera functionality. Possible values are: 0 - mmap (default mode) 1 - user pointer (not supported) 2 - dma buffer

programs

Provides audio/video stream information.

Name	Required	Type	Description
video_stream	Required	Number (int32_t)	The number of video streams in program.
audio_stream	Required	Number (int32_t)	The number of audio streams in program.

sourceInfo

Provides information of the media that has just been loaded.

Example:

{
   "sourceInfo": {
       "programs": [{
           "audio_stream": 1,
           "video_stream": 1
       }],
       "seekable": true,
       "video_streams": [{
"width": 854,
           "frame_rate": {
               "num": 24,
               "den": 1
           },
           "bitrate": 535929,
           "height": 480
       }],
       "audio_streams": [{
"sample_rate": 48000,
           "bit_rate": 0
       }],
       "container": "",
       "duration": 52209
   }
}

Name	Required	Type	Description
programs	Required	Object array: programs	See "programs" object.
seekable	Required	Boolean	Flag indicating whether the media supports seek operations. To send information that the content is available for seek, set seekable to true. To send information that the content is not available for seek, set seekable to false.
video_streams	Required	Object array: videoInfo	See "videoInfo" object.
audio_streams	Required	Object array: audioInfo	See "audioInfo" object.
container	Optional	String	Media format (container type) of source "RAW","WAV","MP3", "AAC", "RA", "AVI", "MP4", "MPEG1", "MPEG2", "ASF", "MKV", "PS", "TS", "RM", "FLV", "F4V", "ISM"
duration	Required	Number (int64_t)	Total duration in milli-seconds of the program.

display_attr

Provides detailed information for display resource.

Name	Required	Type	Description
crtc-id	Required	Number (int32_t)	Crtc id of display
plane-id	Required	Number (uint32_t)	Plane id of display
conn-id	Required	Number (int32_t)	Connector id of display

acbs

Array of objects that gives details of media for foreground application (such as pipeline Id, playstate, position, etc.)

Name	Required	Type	Description
pipelineId	Required	String	Pipeline id
playStateNow	Required	String	Current playback status
playStateNext	Required	String	Next playback status
isFullScreen	Required	Boolean	Specifies if the app is in full screen mode.
positionX	Required	Number (int32_t)	X Position of window
positionY	Required	Number (int32_t)	Y Position of window
width	Required	Number (int32_t)	Width of the app window.
height	Required	Number (int32_t)	Height of the app window.

Signals/Events

loadCompleted

The loadCompleted event is raised when a specific media pipeline has been successfully loaded.

Call Returns

Name	Required	Type	Description
loadCompleted	Required	String	Unique identifier of the loaded pipeline.

unloadCompleted

The unloadCompleted event is raised when a specific media pipeline has been successfully unloaded.

Call Returns

Name	Required	Type	Description
mediaId	Required	String	Unique identifier of the unloaded pipeline.

detached

The detached event is raised when a specific media has been detached from the client by another client attaching to the corresponding pipeline. The detached event is related to the attach command. Attach allows to transfer the control of a pipeline to be handed over to a different client. When that happens the original client gets notified that it got detached from the pipeline and is hence no longer able to control the pipeline. This feature is related to fast boot scenarios where we have a mini-app controlling media upon initial launch and the control is handed over to the real/full application once the system has started in full.

Call Returns

Name	Required	Type	Description
mediaId	Optional	String	Unique identifier of detached pipeline.

seekDone

The seekDone event is raised when a seek operation for a media has been successfully completed.

Call Returns

Name	Required	Type	Description
mediaId	Required	String	Unique identifier of the requested pipeline to seek.

playing

The playing event is raised once, in response to the play method, when a specified media pipeline has transitioned into the playing state.

Call Returns

Name	Required	Type	Description
mediaId	Required	String	Unique identifier of the requested pipeline to play.

paused

The paused event is raised when a specific media has been successfully paused.

Call Returns

Name	Required	Type	Description
mediaId	Required	String	Unique identifier of the requested pipeline to pause.

endOfStream

The endOfStream event is raised when a specific media has received all of its data.

Call Returns

Name	Required	Type	Description
mediaId	Required	String	Unique identifier of pipeline met end of stream.

currentTime

The currentTime event is raised multiple times when a specific media is playing. It indicates the progress of the media being played and provides the current time at which the media is being played.

Call Returns

Name	Required	Type	Description
currentTime	Required	String	Current time at which the media is being played.
mediaId	Required	String	Unique identifier of pipeline which reports current time.

sourceInfo

The sourceInfo event provides information about the media that has just been loaded.

Call Returns

Name	Required	Type	Description
sourceInfo	Required	String	See "sourceInfo" object.

videoInfo

The videoInfo event provides information related to video.

Call Returns

Name	Required	Type	Description
videoInfo	Required	String	See "videoInfo" object.

audioInfo

The audioInfo event provides information related to audio.

Call Returns

Name	Required	Type	Description
audioInfo	Required	String	See "audioInfo" object.

error

The error event reports errors thrown by pipelines.

Call Returns

Name	Required	Type	Description
errorCode	Optional	String	Error code from the service.
errorText	Optional	String	Error code description from the service.
mediaId	Required	String	Unique identifier of pipeline sending error information.

acquireComplete

The acquireCompete event is invoked when the acquire request is performed and the result comes out.

Call Returns

Name

Required

Type

Description

resources

Required

String

See "resources" object.

state

Required

String

Flag indicating the result of acquire request.

To send information that resource acquisition is successfully performed, set state to true.
To send information that resource acquisition failed, set state to false.

connectionId

Required

String

Unique identifier of the pipeline to acquire resource.

policyAction

The policyAction event is invoked when the resources are short of quantity to playing new media content and request pipeline to release regarding resource.

Call Returns

Name	Required	Type	Description
requestor_type	Required	String	Type of pipeline that made a new request. This is the pipeline requesting the additional resources.
requestor_name	Required	String	Name of pipeline that made new request. This is the pipeline requesting additional resources.
action	Required	String	Action requested to do at the pipeline when this policyAction is delivered.
resources	Required	String	See "resources" object.
connectionId	Required	String	Unique identifier of the pipeline to get policyAction event

API Error Codes Reference

Error Code

Error Text

Error Description

600

PolicyAction

Media related errors reported by the media pipeline are reported into several categories.

RM category related errors are reported in the 600 range.
For managed pipelines

601

Resource Allocation Error

Media related errors reported by the media pipeline are reported into several categories.

RM category related errors are reported in the 600 range.
For managed pipelines