harmony 鸿蒙AVSource
AVSource
Overview
The AVSource module provides functions for constructing audio and video resource objects.
\@syscap SystemCapability.Multimedia.Media.Spliter
Since
10
Summary
File
| Name | Description |
|---|---|
| native_avsource.h | Declares the native APIs used to construct audio and video resource objects. File to include: Library: libnative_media_avsource.so |
Functions
| Name | Description |
|---|---|
| *OH_AVSource_CreateWithURI (char *uri) | Creates an OH_AVSource instance based on a URI. |
| *OH_AVSource_CreateWithFD (int32_t fd, int64_t offset, int64_t size) | Creates an OH_AVSource instance based on a file descriptor (FD). |
| OH_AVSource_Destroy (OH_AVSource *source) | Destroys an OH_AVSource instance and clears internal resources. An instance can be destroyed only once. |
| *OH_AVSource_GetSourceFormat (OH_AVSource *source) | Obtains the basic information about a media resource. |
| *OH_AVSource_GetTrackFormat (OH_AVSource *source, uint32_t trackIndex) | Obtains the basic information about a track. |
Function Description
OH_AVSource_CreateWithFD()
OH_AVSource* OH_AVSource_CreateWithFD (int32_t fd, int64_t offset, int64_t size)
Description
Creates an OH_AVSource instance based on an FD.
You can release the instance by calling OH_AVSource_Destroy.
If offset is not the start position of the file or size is not the file size, undefined errors such as creation failure and decapsulation failure may occur due to incomplete data obtained.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| fd | FD of a media resource file. |
| offset | Position from which data is to read. |
| size | File size, in bytes. |
Returns
Returns the pointer to an OH_AVSource instance.
Since
10
OH_AVSource_CreateWithURI()
OH_AVSource* OH_AVSource_CreateWithURI (char *uri)
Description
Create an OH_AVSource instance object based on a URI. You can release the instance by calling OH_AVSource_Destroy.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| uri | URI of the media resource. |
Returns
Returns the pointer to an OH_AVSource instance.
Since
10
OH_AVSource_Destroy()
OH_AVErrCode OH_AVSource_Destroy (OH_AVSource *source)
Description
Destroys an OH_AVSource instance and clears internal resources.
An instance can be destroyed only once.
The destroyed instance cannot be used until it is re-created. You are advised to set the pointer to NULL after the instance is destroyed.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| source | Pointer to an OH_AVSource instance. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
10
OH_AVSource_GetSourceFormat()
OH_AVFormat* OH_AVSource_GetSourceFormat (OH_AVSource *source)
Description
Obtains the basic information about a media resource.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| source | Pointer to an OH_AVSource instance. |
Returns
Returns the basic information obtained.
Since
10
OH_AVSource_GetTrackFormat()
OH_AVFormat* OH_AVSource_GetTrackFormat (OH_AVSource *source, uint32_t trackIndex)
Description
Obtains the basic information about a track.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| source | Pointer to an OH_AVSource instance. |
| trackIndex | Index of the track whose information is to be obtained. |
Returns
Returns the basic information obtained.
Since
10
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