Playback method and playback device
A playback method according to one aspect of the present disclosure is performed by a playback device connected to a display device. The playback method includes obtaining a type of the display device; selecting each of a version of High-Definition Multimedia Interface (HDMI) and a version of High-bandwidth Digital Content Protection (HDCP), according to the obtained type of the display device; obtaining a video signal of content recorded on a recording medium; decoding the obtained video signal; encrypting the decoded video signal using the selected version of HDCP; and outputting the encrypted video signal to the display device using the selected version of HDMI.
1. A playback device to be connected to a display device, the playback device comprising:
an obtainer that obtains, from the display device, type information indicating (i) a resolution of the display device and (ii) a luminance range that the display device is compatible with;
a selector that (i) selects a version of high-bandwidth digital content protection (HDCP) based on both of the resolution of the display device and the luminance range indicated by the type information and (ii) selects a version of high-definition multimedia interface (HDMI) based on both of the resolution of the display device and the luminance range indicated by the type information; and
an outputter that encrypts a video signal, using the selected version of HDCP and outputs the encrypted video signal, using the selected version of HDMI.
2. The playback device according to claim 1 , wherein
when the resolution of the display device is 2K and the luminance range of the display device is a standard dynamic range (SDR), the outputter encrypts the video signal, using HDCP 1.4 and outputs the encrypted video signal, using HDMI 1.4.
3. The playback device according to claim 1 , wherein
when the resolution of the display device is 4K and the luminance range of the display device is an SDR, the outputter encrypts the video signal, using HDCP 2.2 and outputs the encrypted video signal, using HDMI 2.0.
4. The playback device according to claim 1 , wherein
when the resolution of the display device is 2K or 4K and the luminance range of the display device is a high dynamic range (HDR), the outputter encrypts the video signal, using HDCP 2.2 and outputs the encrypted video signal, using HDMI 2.1.
5. The playback device according to claim 1 , wherein
when the type information obtained from the display device indicates the resolution of 2K and the luminance range displayable by the display device being wider than an SDR, the outputter encrypts the video signal, using HDCP 1.4 and outputs the encrypted video signal, using HDMI 1.4.
6. The playback device according to claim 5 , wherein
the playback device determines, according to user's specification, whether to convert the video signal into the luminance range being the SDR or to convert the video signal into the luminance range displayable by the display device.
7. The playback device according to claim 1 , wherein
when the type information obtained from the display device indicates the resolution of 4K and the luminance range displayable by the display device being wider than an SDR, the outputter encrypts the video signal, using HDCP 2.2 and outputs the encrypted video signal, using HDMI 2.0.
8. The playback device according to claim 7 , wherein
the playback device determines, according to user's specification, whether to convert the video signal into the luminance range being the SDR or to convert the video signal into the luminance range displayable by the display device.
9. The playback device according to claim 1 , wherein
the type information includes information indicating whether the display device is compatible with the HDR.
10. A playback method for a playback device to be connected to a display device, the playback method comprising:
obtaining, from the display device, type information indicating (i) a resolution of the display device and (ii) a luminance range that the display device is compatible with;
(i) selecting a version of high-bandwidth digital content protection (HDCP) based on both of the resolution of the display device and the luminance range indicated by the type information and (ii) selecting a version of high-definition multimedia interface (HDMI) based on both of the resolution of the display device and the luminance range indicated by the type information; and
encrypting a video signal, using the selected version of HDCP and outputting the encrypted video signal, using the selected version of HDMI.