harmony 鸿蒙Media Subsystem Changelog
Media Subsystem Changelog
cl.multimedia.1 OH_AVCodecBufferAttr Behavior Changed
Access Level
Public API
Reason for Change
For a video track, pts in the obtained OH_AVCodecBufferAttr struct is the timestamp encapsulated in the file minus the track start time so that it starts from 0. However, the pts processing is different for the audio and video tracks. When pts is used for audio and video synchronization, abnormal video effects occur.
Change Impact
This change is a non-compatible change. The pts value of the video track obtained is no longer starting from 0. Specifically, the pts information encapsulated in the file is used.
Start API Level
10
Change Since
OpenHarmony SDK 5.0.0.39
Key API/Component Changes
| Name | Description |
|---|---|
| OH_AVCodecBufferAttr | Description information about the buffer of an OH_AVCodec instance. |
Adaptation Guide
The method of obtaining pts remains unchanged. However, no additional processing is performed internally. As such, pts is the timestamp encapsulated in the file. You can use and process pts based on your service logic. The sample code is as follows:
OH_AVBuffer *buffer = OH_AVBuffer_Create(w * h * 3 >> 1);
if (buffer == nullptr) {
// Exception handling.
}
int32_t ret = OH_AVDemuxer_ReadSampleBuffer(demuxer, trackIndex, buffer);
if (ret != AV_ERR_OK) {
// Exception handling.
}
OH_AVCodecBufferAttr info;
ret = OH_AVBuffer_GetBufferAttr(buffer, &info);
if (ret != AV_ERR_OK) {
// Exception handling.
}
int64_t newPts = info.pts;
You can also convert the obtained pts to pts before the change based on the track start time, OH_MD_KEY_TRACK_START_TIME, which can be obtained since API version 12. The code is as follows:
OH_AVFormat *trackFormat = OH_AVSource_GetTrackFormat(source, trackIndex);
if (trackFormat == nullptr) {
// Exception handling.
}
int64_t startTime = 0;
if (!OH_AVFormat_GetLongValue(trackFormat, OH_MD_KEY_TRACK_START_TIME, &startTime)) {
// Exception handling.
}
int64_t oldPts = newPts - startTime;
cl.multimedia.2 EffectSuggestionType Behavior Changed
Access Level
System API
Reason for Change
Only system APIs can obtain or update the enums related to effect recommendation.
Change Impact
This change is a non-compatible change.
Before change: The enum is a public interface.
After change: The enum is a system interface.
Start API Level
12
Change Since
OpenHarmony SDK 5.0.0.39
Key API/Component Changes
EffectSuggestionType/camera component
Adaptation Guide
No adaptation is required. Related APIs are not opened. The change is only to keep the access level consistent with that of related APIs.
cl.multimedia.3 EffectSuggestionStatus Behavior Changed
Access Level
System API
Reason for Change
Only system APIs can obtain or update the classes related to effect recommendation.
Change Impact
This change is a non-compatible change.
Before change: The class is a public interface.
After change: The class is a system interface.
Start API Level
12
Change Since
OpenHarmony SDK 5.0.0.39
Key API/Component Changes
EffectSuggestionStatus/camera component
Adaptation Guide
No adaptation is required. Related APIs are not opened. The change is only to keep the access level consistent with that of related APIs.
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