PLAYBACK APPARATUS, INTEGRATED CIRCUIT, AND PLAYBACK METHOD CONSIDERING TRICKPLAY

• US 20100150523A1
• Filed: 11/17/2009
• Published: 06/17/2010
• Est. Priority Date: 11/18/2008
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Okubo, Masafumi, Leichsenring, Germano
• Granted Patent: US 8,548,308 B2
• Time in Patent Office: Days
• US Class Current: 386/343
• CPC Class Codes: G11B 27/005 Reproducing at a different information rate from the information rate of recording for television signals H04N5/783
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/11 by using information not detectable on the record carrier
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: H04N 13/161 Encoding, multiplexing or demultiplexing different image signal components for multi-view video sequence encoding H04N19/597
• CPC Class Codes: H04N 13/178 Metadata, e.g. disparity information
• CPC Class Codes: H04N 13/183 On-screen display [OSD] information, e.g. subtitles or menus
• CPC Class Codes: H04N 13/189 Recording image signals; Reproducing recorded image signals
• CPC Class Codes: H04N 5/782 on tape
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8205 involving the multiplexing of an additional signal and the colour video signal
• CPC Class Codes: H04N 9/8233 the additional signal being a character code signal

Abstract

A read unit 201 reads a digital stream that includes a left-view video stream and a right-view video stream from a recording medium. A mode storage unit 203 stores either a 3D mode to show a user video frames in stereoscopic view or a 2D mode to show a user video frames in monoscopic view as a playback mode of the apparatus. A dimension determining unit 202 determines whether the digital stream read from the recording medium supports 3D mode. When (i) the digital stream supports 3D mode and (ii) the current playback mode is 3D mode, a demultiplexer 204 separates the left-view video stream and the right-view video stream from the digital stream, and when condition (i) or (ii) is not met, the demultiplexer 204 separates either the left-view video stream or the right-view video stream from the digital stream.

Claims

1. A playback apparatus, a playback mode of which can be switched between 3D mode to show a user video frames stereoscopically and 2D mode to show the user video frames monoscopically, the playback apparatus comprising:

a read unit operable to read a digital stream that includes a left-view video stream and a right-view video stream from a recording medium;

a mode storage unit storing a current playback mode;

a dimension determining unit operable to determine whether the digital stream read from the recording medium supports 3D mode;

a demultiplexer operable, when (i) the digital stream supports 3D mode and (ii) the current playback mode is 3D mode, to separate both the left-view video stream and the right-view video stream from the digital stream, and when condition (i) or (ii) is not met, to separate one of the left-view video stream and the right-view video stream from the digital stream; and

a video decoder operable to obtain video frames to show stereoscopically or monoscopically by decoding the separated video stream.

2. The playback apparatus in claim 1 further comprising:

a playback control unit operable to control the video decoder so that, when trickplay is requested while the current playback mode is 3D mode, a same video frame output from the video decoder is written on both a left-view video plane and a right-view video plane while maintaining the playback mode in 3D mode, wherein

the same video frame is a video frame obtained by decoding one of the left-view video stream and the right-view video stream separated from the digital stream.

3. The playback apparatus in claim 2, wherein

trickplay indicates one of fast forward and rewind.

4. The playback apparatus in claim 2, wherein

trickplay changes a playback speed,

when trickplay that changes a playback speed is requested, the playback control unit determines whether it is possible to output a video frame in the left-view video stream and a video frame in the right-view video stream alternately at the changed playback speed, and

writing of the same video frame on the left-view video plane and the right-view video plane is performed only when the playback control unit determines that it is not possible to output video frames alternately at the changed playback speed.

5. The playback apparatus of claim 4, wherein

a playback speed at which it is possible to output a video frame in the left-view video stream and a video frame in the right-view video stream alternately is one of a) a playback speed when trickplay is quick view, b) a playback speed when trickplay is frame forward, and c) a playback speed when trickplay is frame reverse.

6. The playback apparatus in claim 1, further comprising:

a platform unit operable to execute a bytecode application; and

a transmission unit operable to transmit video frames to a display apparatus connected to the playback apparatus, thereby causing the display apparatus to output video frames, wherein

when the playback mode stored in the mode storage unit is switched from 2D mode to 3D mode or vice-versa, the transmission unit performs reauthentication of the display apparatus, and

after the reauthentication, if the platform unit receives notification of a capability to output in accordance with a mode after switching, the platform unit notifies a bytecode application executed by the platform unit of the capability to output in accordance with the mode after switching.

7. The playback apparatus in claim 1, wherein

when playback of a video stream in 3D mode is stopped or paused, the playback mode in the mode storage unit remains set to 3D mode, and

the video decoder alternately outputs a video frame obtained by decoding the left-view video stream at a position where playback stops and a video frame obtained by decoding the right-view video stream at the position where playback stops.

8. The playback apparatus in claim 7, further comprising:

a platform unit operable to execute a bytecode application; and

a command interpreter operable to interpret and execute a program described in commands, wherein

the playback is stopped or paused via one of (a), (b), (c), and (d);

(a) user operation via remote control;

(b) an instruction by a bytecode application executed by the platform unit;

(c) an instruction from an object program executed by the command interpreter; and

(d) the left-view or right-view video stream being played back to an end.

9. The playback apparatus in claim 1, wherein

when playback control in the playback apparatus changes from normal playback to slideshow playback, a video frame obtained by decoding the left-view video stream and a video frame obtained by decoding the right-view video stream are alternately output.

10. The playback apparatus in claim 9, wherein

the video decoder is caused to decode a video stream in a digital stream in accordance with playback section information recorded on a recording medium,

the playback section information includes attribute information indicating whether the digital stream has a slideshow attribute or a movie attribute, and

slideshow playback is performed when a current playback section information changes from playback section information having a movie attribute to playback section information having a slideshow attribute.

11. The playback apparatus in claim 1, wherein:

playback section information, which includes mask information indicating whether to mask an instruction for trickplay by a user or an instruction for trickplay by contents, is recorded on the recording medium, and

the playback apparatus further comprises;

a playback control unit operable to determine, when a request for trickplay is made during 3D mode, whether the mask information indicates that an instruction for trickplay by a user is masked, wherein

when the mask information indicates that trickplay is masked, the playback control unit causes the video decoder to output video frames alternately without performing trickplay, and

when the mask information indicates that trickplay is not masked, a same video frame output from the video decoder can be repeatedly written on the left-view video plane and the right-view video plane while maintaining the playback mode in the mode storage unit in 3D mode.

12. The playback apparatus in claim 1, further comprising:

an image decoder, an image plane, a plane shift engine, and a composition unit, wherein

the digital stream includes a graphics stream,

the read unit further reads, from the recording medium, shift position information for shifting the image plane,

the demultiplexer further separates a graphics stream,

the image decoder decodes the separated graphics stream and writes the graphics obtained by decoding on the image plane,

the plane shift engine shifts coordinates of pixels constituting graphics written on the image plane in accordance with the shift position information, and

the composition unit combines a left-view video frame and right-view video frame obtained by decoding the separated left-view video stream and right-view video stream with shifted graphics in the image plane to yield a video frame for output in 3D mode.

13. The playback apparatus in claim 2, wherein

when trickplay is indicated in 3D mode, one of (a) and (b) is performed:

(a) one of a video frame obtained by decoding a left-view video stream and a video frame obtained by decoding a right-view video stream is output, without being combined with graphics, and

(b) one of a video frame obtained by decoding a left-view video stream and a video frame obtained by decoding a right-view video stream is output after being combined with graphics whose pixel coordinates have not changed via a plane shift.

14. The playback apparatus in claim 11, wherein

when playback by the video decoder is stopped or paused, one of (a) and (b) is performed:

(a) a video frame obtained by decoding a left-view video stream and a video frame obtained by decoding a right-view video stream that exist at a position where playback stops are alternately output after being combined with graphics whose pixel coordinates have changed via a plane shift, and

(b) only a video frame obtained by decoding a left-view video stream and a video frame obtained by decoding a right-view video stream that exist at a position where playback stops are alternately output, and video frames are not combined with graphics.

15. The playback apparatus in claim 13, further comprising:

a platform unit operable to execute a bytecode application; and

a command interpreter operable to interpret and execute a program described in commands, wherein

the playback is stopped or paused via one of (c), (d), (e), and (f);

(c) user operation via remote control;

(d) an instruction by a bytecode application executed by the platform unit;

(e) an instruction from an object program executed by the command interpreter; and

(f) the left-view or right-view video stream being played back to an end.

16. The playback apparatus in claim 11, wherein

when playback by the video decoder changes from normal playback to slideshow playback, one of processes (a) and (b) is performed while maintaining the playback mode in 3D mode:

(a) a video frame obtained by decoding the left-view video stream and a video frame obtained by decoding the right-view video stream are alternately output after being combined with graphics whose pixel coordinates have changed via a plane shift, and

(b) only a video frame obtained by decoding a left-view video stream and a video frame obtained by decoding a right-view video stream are alternately output, and graphics in the image plane are not output.

19. The playback apparatus in claim 12, wherein

when trickplay is indicated in 3D mode, one of (a) and (b) is performed:

(a) one of a video frame obtained by decoding a left-view video stream and a video frame obtained by decoding a right-view video stream is output, without being combined with graphics, and

(b) one of a video frame obtained by decoding a left-view video stream and a video frame obtained by decoding a right-view video stream is output after being combined with graphics whose pixel coordinates have not changed via a plane shift.

20. The playback apparatus in claim 19, further comprising:

a platform unit operable to execute a bytecode application; and

a command interpreter operable to interpret and execute a program described in commands, wherein

the playback is stopped or paused via one of (c), (d), (e), and (f);

(c) user operation via remote control;

(d) an instruction by a bytecode application executed by the platform unit;

(e) an instruction from an object program executed by the command interpreter; and

(f) the left-view or right-view video stream being played back to an end.

17. An integrated circuit embeddable in a playback apparatus, a playback mode of which can be switched between a 3D mode to show a user video frames stereoscopically and a 2D mode to show a user video frames monoscopically, the integrated circuit comprising:

a dimension determining unit operable to determine, when a digital stream that includes a left-view video stream and a right-view video stream is read from a recording medium, whether the digital stream read from the recording medium supports 3D mode;

a demultiplexer operable, when (i) the digital stream supports 3D mode and (ii) the current playback mode is 3D mode, to separate both the left-view video stream and the right-view video stream from the digital stream, and when condition (i) or (ii) is not met, to separate one of the left-view video stream and the right-view video stream from the digital stream; and

a video decoder operable to obtain video frames to show stereoscopically or monoscopically by decoding separated video streams.

18. A playback method used on a computer, a playback mode of which can be switched between 3D mode to show a user video frames stereoscopically and 2D mode to show the user video frames monoscopically, comprising the steps of:

reading a digital stream that includes a left-view video stream and a right-view video stream from a recording medium;

determining whether the digital stream read from the recording medium supports 3D mode;

when (i) the digital stream supports 3D mode and (ii) the current playback mode is 3D mode, separating both the left-view video stream and the right-view video stream from the digital stream, and when condition (i) or (ii) is not met, separating one of the left-view video stream and the right-view video stream from the digital stream; and

decoding the separated video stream to obtain video frames to show stereoscopically or monoscopically.