harmony 鸿蒙AVDemuxer
AVDemuxer
Overview
The AVDemuxer module provides functions for audio and video decapsulation.
\@syscap SystemCapability.Multimedia.Media.Spliter
Since
10
Summary
File
| Name | Description |
|---|---|
| native_avdemuxer.h | Declares the native APIs used for audio and video decapsulation. File to include: Library: libnative_media_avdemuxer.so |
Functions
| Name | Description |
|---|---|
| *OH_AVDemuxer_CreateWithSource (OH_AVSource *source) | Creates an OH_AVDemuxer instance based on an OH_AVSource instance. |
| OH_AVDemuxer_Destroy (OH_AVDemuxer *demuxer) | Destroys an OH_AVDemuxer instance and clears internal resources. |
| OH_AVDemuxer_SelectTrackByID (OH_AVDemuxer *demuxer, uint32_t trackIndex) | Selects a track, from which the demuxer reads data. |
| OH_AVDemuxer_UnselectTrackByID (OH_AVDemuxer *demuxer, uint32_t trackIndex) | Deselects a track. The demuxer no longer reads data from a track after it is deselected. |
| OH_AVDemuxer_ReadSample (OH_AVDemuxer *demuxer, uint32_t trackIndex, OH_AVMemory *sample, OH_AVCodecBufferAttr *info) | Obtains the compressed frame and related information at the current position from the selected track. |
| OH_AVDemuxer_SeekToTime (OH_AVDemuxer *demuxer, int64_t millisecond, OH_AVSeekMode mode) | Seeks to the specified time for all the selected tracks based on a seek mode. |
Function Description
OH_AVDemuxer_CreateWithSource()
OH_AVDemuxer* OH_AVDemuxer_CreateWithSource (OH_AVSource *source)
Description
Creates an OH_AVDemuxer instance based on an OH_AVSource instance. You can release the instance by calling OH_AVDemuxer_Destroy.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| source | Pointer to an OH_AVSource instance. |
Returns
Returns the pointer to an OH_AVDemuxer instance.
Since
10
OH_AVDemuxer_Destroy()
OH_AVErrCode OH_AVDemuxer_Destroy (OH_AVDemuxer *demuxer)
Description
Destroys an OH_AVDemuxer 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 |
|---|---|
| demuxer | Pointer to an OH_AVDemuxer instance. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
10
OH_AVDemuxer_ReadSample()
OH_AVErrCode OH_AVDemuxer_ReadSample (OH_AVDemuxer *demuxer, uint32_t trackIndex, OH_AVMemory *sample, OH_AVCodecBufferAttr *info)
Description
Obtains the compressed frame and related information at the current position from the selected track.
You must select a track before reading data. After this API is called, the demuxer automatically proceeds to the next frame.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| demuxer | Pointer to an OH_AVDemuxer instance. |
| trackIndex | Index of the track from which the compressed frame is to be read. |
| sample | Pointer to the OH_AVMemory instance for storing the compressed frame data. |
| info | Pointer to the OH_AVCodecBufferAttr instance for storing the compressed frame information. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
10
OH_AVDemuxer_SeekToTime()
OH_AVErrCode OH_AVDemuxer_SeekToTime (OH_AVDemuxer *demuxer, int64_t millisecond, OH_AVSeekMode mode)
Description
Seeks to the specified time for all the selected tracks based on a seek mode.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| demuxer | Pointer to an OH_AVDemuxer instance. |
| millisecond | Time to seek to, in milliseconds. The timestamp is relative to the start position of the file. |
| mode | Seek mode. For details, see OH_AVSeekMode. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
10
OH_AVDemuxer_SelectTrackByID()
OH_AVErrCode OH_AVDemuxer_SelectTrackByID (OH_AVDemuxer *demuxer, uint32_t trackIndex)
Description
Selects a track, from which the demuxer reads data.
You can select multiple tracks by calling this API multiple times, with a different track index passed in each time.
When OH_AVDemuxer_ReadSample is called, only the data in the selected track is read. If the same track is selected multiple times, AV_ERR_OK is returned and the API call takes effect only once.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| demuxer | Pointer to an OH_AVDemuxer instance. |
| trackIndex | Index of the track. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
10
OH_AVDemuxer_UnselectTrackByID()
OH_AVErrCode OH_AVDemuxer_UnselectTrackByID (OH_AVDemuxer *demuxer, uint32_t trackIndex)
Description
Deselects a track. The demuxer no longer reads data from a track after it is deselected.
You can deselect multiple tracks by calling this API multiple times, with a different track index passed in each time.
If the same track is deselected multiple times, AV_ERR_OK is returned and the API call takes effect only once.
\@syscap SystemCapability.Multimedia.Media.Spliter
Parameters
| Name | Description |
|---|---|
| demuxer | Pointer to an OH_AVDemuxer instance. |
| trackIndex | Index of the track. |
Returns
Returns AV_ERR_OK if the operation is successful; returns an error code defined in OH_AVErrCode otherwise.
Since
10
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