Apparatus and method for providing content for synchronizing left/right streams in fixed/mobile convergence 3DTV, and apparatus and method for playing content
An apparatus and a method for synchronizing left and right streams in a stationary/mobile hybrid 3DTV are disclosed. The apparatus according to an exemplary embodiment may synchronize content streams corresponding to left and right images using a timestamp pairing mode, a timestamp offset mode, and a network time protocol (NTP) synchronization mode.
1. A content providing apparatus comprising: one or more processors configured to:
generate a timestamp offset between timestamps corresponding to an access unit (AU) of a one view image or an AU of an other view image to be synchronized as synchronization information; and
multiplex the synchronization information into signaling information wherein the timestamp offset is determined based on a difference of a presentation timestamp (PTS) and a real-time transport protocol (RTP) timestamp corresponding to the AU (Access Unit), wherein the PTS is related to a main service, and the RTP timestamp is related to a Mobile Digital TV (DTV) service.
2. The content providing apparatus of claim 1 , wherein the one or more processors generates a timestamp offset related to a difference between a presentation timestamp (PTS) corresponding to the AU of the one view image and a real-time transport protocol (RTP) timestamp of an AU included in a additional view content stream at a synchronization time as synchronization information.
3. The content providing apparatus of claim 1 , wherein the one or more processors generates a timestamp offset related to a difference between a PTS corresponding to the AU of the one view image and a PTS of an AU included in a additional view content stream at a synchronization time as synchronization information.
4. The content providing apparatus of claim 1 , wherein the one or more processors generates a timestamp offset related to a difference between an RTP timestamp corresponding to the AU of the one view image and an RTP timestamp of an AU included in a additional view content stream at a synchronization time as synchronization information.
5. The content providing apparatus of claim 1 , wherein the one or more processors multiplexes the synchronization information into signaling information of a main content stream corresponding to the one view image or signaling information of a additional view content stream corresponding to the other view image.
6. A content reproduction apparatus comprising: one or more processors configured to:
extract, as synchronization information, a timestamp offset between timestamps corresponding to an access unit (AU) of a one view image and an AU of an other view image from signaling information; and
restore playback times of the AUs of the one view image and the other view image using the synchronization information and a reference clock of the one view image or the other view image,
wherein the timestamp offset is determined based on a difference of a presentation timestamp (PTS) and a real-time transport protocol (RTP) timestamp corresponding to the AU(Access Unit),
wherein the PTS is related to a main service, and the RTP timestamp is related to a Mobile Digital TV(DTV) service.
7. The content reproduction apparatus of claim 6 , wherein the signaling information comprises signaling information of a main content stream corresponding to the one view image or signaling information of a additional view content stream corresponding to the other view image.
8. The content reproduction apparatus of claim 6 , wherein the one or more processors synchronizes the playback times of the one view image and the other view image based on a program clock reference (PCR).
9. The content reproduction apparatus of claim 8 , wherein the one or more processors converts a real-time transport protocol (RTP) timestamp of the AU corresponding to the other view image into a presentation timestamp (PTS) of the AU corresponding to the one view image.
10. The content reproduction apparatus of claim 8 , wherein the one or more processors converts a PTS of the AU corresponding to the other view image into a PTS of the AU corresponding to the one view image.
11. The content reproduction apparatus of claim 6 , wherein the one or more processors synchronizes the playback times of the one view image and the other view image based on a network time protocol (NTP) reference clock.
12. The content reproduction apparatus of claim 11 , wherein the one or more processors converts a PTS of the AU corresponding to the one view image into an NTP timestamp of the AU corresponding to the other view image.
13. The content reproduction apparatus of claim 11 , wherein the one or more processors converts a PTS of the AU corresponding to the one view image into an RTP timestamp of the AU corresponding to the other view image.
14. The content reproduction apparatus of claim 11 , wherein the one or more processors converts an RTP timestamp of the AU corresponding to the other view image into an RTP timestamp of the AU corresponding the one view image.