1# Multimedia Subsystem Changelog 2 3## cl.multimedia.1 The default behavior of OH_AVCodecOnStreamChanged in the audio decoding scenario is changed. 4 5**Access Level** 6 7Public API 8 9**Reason for Change** 10 11If parameters such as the sampling rate change during audio decoding, a callback needs to be invoked to notify the caller. 12 13**Impact of the Change** 14 15This change does not require application adaptation. 16 17Before change: If an application has registered the **OH_AVCodecOnStreamChanged** callback by calling **OH_AudioCodec_RegisterCallback**, this callback is triggered when the sampling rate or number of audio channels changes during audio decoding. 18 19After change: If an application has registered the **OH_AVCodecOnStreamChanged** callback by calling **OH_AudioCodec_RegisterCallback**, this callback is triggered when the sampling rate or number of audio channels changes during audio decoding. 20 21**Start API Level** 22 239 24 25**Change Since** 26 27OpenHarmony SDK 5.1.0.50 28 29**Key API/Component Changes** 30 31**OH_AVCodecOnStreamChanged** in **native_avcodec_base.h**, which is registered by **OH_AudioCodec_RegisterCallback** in **native_avcodec_audiocodec.h** 32 33**Adaptation Guide** 34 35No adaptation is required. 36