Method and device for transmitting and receiving broadcast signal
The present invention relates to a device and a method for transmitting and receiving a signal of a broadcast including a subtitle service. One embodiment of the present invention provides a broadcast signal transmitting method comprising the steps of generating a broadcast signal, which includes video data and subtitle data, and transmitting the generated broadcast signal. According to one embodiment of the present invention, a transmission stream for providing a digital broadcasting subtitle service using XML subtitles can be transmitted.
1. A method for transmitting a broadcast signal by a broadcast signal transmission device for transmitting a broadcast signal, comprising:
generating, by an encoder, video data, that correspond to enhanced HDR (High Dynamic Range) content or SDR (Standard Dynamic Range) content, based on an access unit;
multiplexing, by a multiplexer, the video data and metadata for enhanced HDR content, the metadata for enhanced HDR content including HDR information type for indicating a unit to which the metadata applies and transition flag for indicating whether a transition from the enhanced HDR content to the SDR content occurs such that a receiver is able to turn off a module related to HDR information descriptor when the transition flag is set to 1 for a last frame; and
transmitting, by a transmitter, the broadcast signal including the multiplexed video data and metadata.
2. The method according to claim 1 , wherein the metadata includes high dynamic range (HDR) information or wide color gamut (WCG) information.
3. The method according to claim 2 , wherein the HDR information or the WCG information is applied in units of channel, program or content.
4. The method according to claim 3 , wherein the HDR information or the WCG information is applied to some sections of the video data in units of scene, clip or frame.
5. The method according to claim 2 , wherein the metadata further includes synchronization information indicating a start time when the HDR or the WCG information is applied to the video data.
6. The method according to claim 2 , wherein the metadata further includes signaling information indicating termination of application of the HDR information.
7. A method for receiving a broadcast signal by an apparatus for receiving a broadcast signal, comprising:
receiving the broadcast signal including video data, the video data corresponding to enhanced HDR (High Dynamic Range) content or SDR (Standard Dynamic Range) content and being generated based on an access unit;
demultiplexing the broadcast signal into the video data and metadata for enhanced HDR content, the metadata for enhanced HDR content including HDR information type fir indicating a unit to which the metadata applies and transition flag for indicating whether a transition from the enhanced HDR content to the SDR content occurs such that the apparatus for receiving the broadcast signal is able to turn off a module related to HDR information descriptor when the transition flag is set to 1 for a last frame;
decoding the video data and the metadata for enhanced HDR content; and
applying the metadata for enhanced HDR content to the video data.
8. The method according to claim 7 , wherein the metadata includes high dynamic range (HDR) information or wide color gamut (WCG) information.
9. The method according to claim 8 , wherein the HDR information or the WCG information is applied in units of channel, program or content.
10. The method according to claim 9 , wherein the HDR information or the WCG information is applied to some sections of the video data in units of scene, clip or frame.
11. The method according to claim 8 , wherein the metadata further includes synchronization information indicating a start time and duration when the HDR or the WCG information is applied to the video data.
12. The method according to claim 8 , wherein the metadata further includes signaling information indicating termination of application of the HDR information.
13. A broadcast signal transmission device comprising:
an encoder to generate video data, that correspond to enhanced HDR (High Dynamic Range) content or SDR (Standard Dynamic Range) content, based on an access unit;
a multiplexer to multiplex the video data and metadata for enhanced HDR content, the metadata for enhanced HDR content including HDR information type for indicating a unit to which the metadata applies and transition flag for indicating whether a transition from the enhanced HDR content to the SDR content occurs such that a receiver is able to turn off a module related to HDR information descriptor when the transition flag is set to 1 for a last frame; and
a transmitter to transmit the broadcast signal including the multiplexed video data and metadata.
14. A broadcast signal reception device comprising:
a receiver to receive a broadcast signal including video data, the video data corresponding to enhanced HDR (High Dynamic Range) content or SDR (Standard Dynamic Range) content and being generated based on an access unit;
a demultiplexer to demultiplex the broadcast signal into the video data, and metadata for enhanced HDR content, the metadata for enhanced HDR content including HDR information type for indicating a unit to which the metadata applies and transition flag for indicating whether a transition from the enhanced HDR content to the SDR content occurs such that the broadcast signal reception device is able to turn off a module related to HDR information descriptor when the transition flag is set to 1 for a last frame;
a decoder to decode the video data and the metadata for enhanced HDR content; and
a post processor to apply the metadata for enhanced HDR content to the video data.