bool _mmcamcorder_set_encoded_preview_gop_interval(MMHandleType handle, int gop_interval);
bool _mmcamcorder_set_sound_stream_info(GstElement *element, char *stream_type, int stream_index);
void _mmcamcorder_set_encoder_bitrate(MMCamcorderEncoderType type, int codec, int bitrate, GstElement *element);
-gboolean _mmcamcorder_invoke_video_stream_cb(MMHandleType handle, GstBuffer *buffer, gboolean is_preview);
+gboolean _mmcamcorder_invoke_video_stream_cb(MMHandleType handle, GstSample *sample, gboolean is_preview, int stream_id);
GstPadProbeReturn __mmcamcorder_muxed_dataprobe(GstPad *pad, GstPadProbeInfo *info, gpointer u_data);
GstPadProbeReturn __mmcamcorder_eventprobe_monitor(GstPad *pad, GstPadProbeInfo *info, gpointer u_data);
#ifdef __cplusplus