HarmonyOS 视频编码使用surface 作为输入，是怎么携带pts的呢

OH_AVBuffer_SetBufferAttr，OH_AVBuffer_GetBufferAttr 来存和取 
typedef struct OH_AVCodecBufferAttr { 
  /* Presentation timestamp of this Buffer in microseconds */ 
  int64_t pts; 
  /* The size of the data contained in the Buffer in bytes */ 
  int32_t size; 
  /* The starting offset of valid data in this Buffer */ 
  int32_t offset; 
  /* The flags this Buffer has, which is also a combination of multiple {@link OH_AVCodecBufferFlags}. */ 
  uint32_t flags; 
} OH_AVCodecBufferAttr;