TWI502484B - Display system and display method - Google Patents

Description

Display system and display method

The present invention relates to a display system, and more particularly to a display system and a display method for playing video content with content protection using a USB display device.

Among the many interfaces used in personal computers and notebooks, the USB (Universal Serial Bus) interface is the most successful and the most widely used. In the current specification of the USB interface, there is no specific definition of audio and video applications, especially audio/video data with content protection (such as digital rights management DRM). For example, the content of a Blu-ray disc is encrypted using an Advanced Access Content System (AACS) encryption and decryption standard to protect audio/video content. In a conventional display system, the driver of the graphics processor can only transfer the original video data obtained to the display card. The processor will further determine whether the display card is output through an analog display interface (such as VGA, DSUB interface) or a digital display interface with data protection (such as HDMI, DisplayPort or DVI). The video file with high image resolution (such as Full High Definition) with content protection can only output through the digital display interface to have the original high image resolution. If the output is output through the analog display interface, the original high picture must be The quality resolution is reduced to the standard definition (Standard Definition).

Therefore, in the current software/hardware architecture of computer systems, if video content with content protection is to be played, users often cannot play video or audio with content protection (such as DHCP) through an external USB display card. News. Therefore, there is a need for a display system that can play video content with content protection using a USB display device.

The present invention provides a display system, including: a processor for decrypting a first encrypted video stream by a first encryption and decryption standard to obtain a first video stream, and using a second encryption and decryption standard a video stream is encrypted to obtain a second encrypted video stream; a graphics processor; a USB display device; a storage unit including a first driver and a second driver; and a chipset; wherein the processor executes The first driver decrypts the second encrypted video stream to obtain a second video stream; wherein the graphics processor and the first driver decode the second video stream to obtain a first video data; wherein the processor further executes the The second driver encrypts the decoded first video data to obtain an encrypted video data, and transmits the encrypted video data to the USB display device; wherein the USB display device decrypts the encrypted video data to obtain a second video message. Data and play the obtained second video material on a display.

The present invention further provides a display system, including: a processor, including a first core and a second core, wherein the first core is configured to decrypt a first encrypted video stream by using a first encryption and decryption standard. Obtaining a first video stream, and encrypting the first video stream by a second encryption and decryption standard to obtain a second encrypted video stream; a USB display device; and a storage unit including a first driver of the second core a second driver of the program and the USB display device; and a chipset coupled to the processor, the USB display device, and the storage unit; wherein the first core system performs the first driving process Decrypting the second encrypted video stream to obtain a second video stream; wherein the second core and the first driver program decode the second video stream to obtain a first video material; wherein the first core And executing the second driver, encrypting the decoded first video data to obtain an encrypted video data, and transmitting the encrypted video data to the USB display device; wherein the USB display device further encrypts the video data Decrypting to obtain a second video material, and playing the obtained second video material on a display.

The present invention further provides a display system, including: a processor, including a first core and a second core, wherein the first core is configured to decrypt a first encrypted video stream by using a first encryption and decryption standard. Obtaining a first video stream, and encrypting the first video stream by a second encryption and decryption standard to obtain a second encrypted video stream; a USB display device; and a storage unit including a first driver of the second core a second driver of the program and the USB display device; and a platform hub controller coupled to the processor, the USB display device, and the storage unit; wherein the first core executes the first driver Decrypting the second encrypted video stream to obtain a second video stream, wherein the second core and the first driver program decode the second video stream to obtain a video data, wherein the first core further performs the second a driver, the decoded first video data is encrypted to obtain an encrypted video data, and the encrypted video data is transmitted to the USB display device; wherein the USB display device is further Decrypts encrypted video data to obtain a second video data, and the second video data to a display of the obtained playback.

The invention further provides a display method for a display system, the display The display system includes: a processor, a graphics processor, a USB display device, a storage unit, and a chipset, wherein the storage unit includes a first driver of the graphics processor and a second of the USB display device a driver, and the chipset is coupled to the processor, the graphics processor, the USB display device, and the storage unit, the method comprising: using the processor to first encrypt the first encryption and decryption standard Decrypting the video stream to obtain a first video stream, and encrypting the first video stream by a second encryption and decryption standard to obtain a second encrypted video stream; and executing, by the processor, the first driver to perform the second encryption The video stream is decrypted to obtain a second video stream; the second video stream is decoded by the graphics processor and the first driver to obtain a first video data; and the second driver is executed by the processor, Decoding the first video data to obtain an encrypted video data, and transmitting the encrypted video data to the USB display device; using the USB display device to encrypt the encrypted video Decrypting data to obtain a second video data; and the use of the USB in a second video display means displays the obtained display information.

The present invention further provides a display method for a display system, the display system comprising: a processor, a USB display device, a storage unit, and a chipset, wherein the processor includes a first core and a second core The storage unit includes a first driver of the second core and a second driver of the USB display device, and the chipset is coupled to the processor, the USB display device, and the storage unit, the method The method includes: decrypting, by using the first core pair, a first encrypted video stream by using a first encryption and decryption standard to obtain a first video stream, and encrypting the first video stream by using a second encryption and decryption standard to obtain a first Two encrypted video streams; using the first core to execute Decoding the second encrypted video stream to obtain a second video stream; using the second core and the first driver to decode the second video stream to obtain a first video data; The first core executes the second driver, encrypts the decoded first video data to obtain an encrypted video data, and transmits the encrypted video data to the USB display device; using the USB display device to encrypt the video Decrypting the data to obtain a second video material; and playing the second video data obtained by the USB display device on a display.

The present invention further provides a display method for a display system, the display system comprising: a processor, a USB display device, a storage unit, a memory unit, and a platform control hub, wherein the processor includes a first a core, a second core, and an integrated memory controller, the storage unit including a first driver of the second core and a second driver of the USB display device, and the chip set is coupled to the processing The USB display device and the storage unit, the method comprising: decrypting, by using the first core pair, a first encrypted video stream of a first encryption and decryption standard to obtain a first video stream, and using a second video Decrypting the first video stream to obtain a second encrypted video stream; using the first core to execute the first driver to decrypt the second encrypted video stream to obtain a second video stream; using the second core And the first driver decodes the second video stream to obtain a first video data; using the first core to execute the second driver, and decoding the first video Encrypting to obtain an encrypted video material, and transmitting the encrypted video data to the USB display device; decrypting the encrypted video data by the USB display device to obtain a second video data; and using the USB display device Play on one display The obtained second video material.

The above described objects, features and advantages of the present invention will become more apparent from the description of the appended claims.

1 is a functional block diagram showing a display system in accordance with an embodiment of the present invention. The display system 100 includes a processor 110, a graphics processor 120, a chipset 130, a first memory unit 140, a second memory unit 150, a storage unit 160, and a USB display device 170. Wafer set 130 serves as a bridge between the various components in display system 100. For example, the wafer set 130 can include a north bridge wafer 131 and a south bridge wafer 132. The north bridge wafer 131 and the south bridge wafer 132 are connected by an internal bus bar 133. The north bridge chip 131 is used to connect components with higher operating frequencies, such as the processor 110, the graphics processor 120, and the first memory unit 140 (eg, system memory). The south bridge wafer 132 is used to connect components with lower operating frequencies (such as PCI devices) and input/output peripheral devices, such as a USB display device 170 or an external playback device (such as a BluRay optical disk drive).

In an embodiment, display system 100 can optionally include an external optical drive 180. The external optical disk drive 180 is coupled to the south bridge chip 132 for playing audio/video data with content protection (for example, AACS encryption).

The first memory unit 140 is a system memory. When the processor 110 decrypts the video data with content protection (such as CSS or AACS), the decrypted audio/video temporary data (such as audio stream) And the video stream) is first stored in the first memory unit 140. The second memory unit 150 is a graphics memory dedicated to the graphics processor 120 for storing graphics data of the graphics processor 120 or decoded video data.

The storage unit 160 stores an operating system 161, a first driver 162, and a second driver 163. The processor 110 executes the operating system 161 as a work platform. The first driver 162 is a dedicated driver of the graphics processor 120. The video data with content protection (for example, an H.264 video stream encrypted by the AES standard) can be decrypted and the video stream can be decoded by the graphics processor 120 (for example, H.264 video streaming). The second driver 163 is a dedicated driver (also referred to as a hook driver) of the USB display device 170 for obtaining the decoded video data from the second memory unit 150 through the graphics processor 120, and The acquired video material is played on the USB display device 170.

In another embodiment, the storage unit 160 can also selectively store the media archive 164 with content protection. The processor 110 may store the media archive 164 with content protection (eg, AACS encryption) by the storage unit 160 and perform data protection decryption.

Figure 2A is a functional block diagram showing a display system 200A in accordance with another embodiment of the present invention. Referring to FIG. 1 and FIG. 2A simultaneously, some of the component functions in the system 200A are the same as those in the display system 100, such as the chipset 230A (including the north bridge wafer 231A and the south bridge wafer 232A), and the storage unit 260A (including the operation). System 261A, first driver 262A and second driver 263A) and USB display device 270A. The difference between the display system 200A and the display system 100 is that the processor 210A is The first core 211A and the second core 212A are included. The function of the first core 211A is the same as that of the processor 110, and the function of the second core 212A is the same as the graphics processor 120. In other words, the processor 210A integrates the functions of a general processor and a graphics processor (for example, an Intel Core 2 Duo processor), and the processor 210A further uses a unified memory architecture, that is, the first core. The 211A and the second core 212A access data are all using the memory unit 240A. In more detail, the memory unit 240A is a graphic memory in addition to the system memory.

2B is a functional block diagram showing a display system 200B in accordance with still another embodiment of the present invention. Referring to FIGS. 2A and 2B, some of the component functions in the system 200B are the same as those in the display system 200A, such as the storage unit 260B (including the operating system 261B, the first driver 262B, and the second driver 263B). And a USB display device 270B. The display system 200B differs from the display system 200A in that the display system 200B uses a platform control hub (PCH) 290 to replace some of the functions of the north bridge chip 231A in the display system 200A (such as an instant clock) and the south bridge. The full functionality of the chip 232A, and the processor 210B is coupled to the platform control hub 290 via a Direct Media Interface (DMI). The processor 210B (for example, an Intel i3, i5, i7 processor) includes a first core 211B, a second core 212B, and an integrated memory controller 213B, wherein the functions of the first core 211B and the second core 212B are respectively The same as the first core 211A and the second core 212A. It is noted that the memory unit 240B in the display system 200B is directly integrated with the memory in the processor 210B. The body controller is electrically connected, and the memory unit 240B also uses a unified memory architecture for the first core 211B (general processing core) and the second core 212B (graphic processing core) to pass through the integrated memory. The body controller 213B accesses the data in the memory unit 240B.

For the present invention, regardless of the display system 100, 200A or 200B, a video file with high image resolution with content protection can be played by the USB display device. For convenience of explanation, the embodiment described later is exemplified by the display system 100 of Fig. 1. Those skilled in the art of the invention will appreciate that the operation of the display system 100 of the present invention can be applied to display systems 200A and 200B.

Figure 3 is a schematic diagram showing the software/hardware architecture of display system 100 in accordance with an embodiment of the present invention. Please refer to FIG. 1 and FIG. 3 at the same time, and the processing flow of the software/hardware of the system 100 (or the display system 200A, 200B) can be roughly divided into five stages of stages 310-350. Stage 310 can also be referred to as User mode unprotected infrastructure. For example, at stage 310, display system 100 can play a video archive with content protection (eg, AACS encryption) via a playback software (eg, Power DVD, Media Player, etc.). Next, the processor 110 decrypts the video content with content protection (including the first encrypted audio stream and the first encrypted video stream) and proceeds to stage 320.

Stage 320 may also be referred to as a User mode protected infrastructure. The processor 110 stores the first audio stream (such as stereo or Dolby code) obtained after decryption and the first video stream (for example, H.264 video stream) in the first memory unit 140, and then the first audio stream and The first video stream utilizes another data encryption technology (eg AES, 3AES) Encrypting to obtain a second encrypted audio stream and a second encrypted video stream, and transmitting the second encrypted audio stream and the second encrypted video stream to a corresponding audio device (eg, a sound card) and the graphics processor 120, respectively, and entering the stage 330. Note that in video content with content protection (eg, AACS) (eg, BluRay disc), the audio signal is less restricted, and the audio device can decrypt the second encrypted audio stream after receiving the second encrypted audio stream. The second audio stream is obtained, and then the second audio stream is decoded to obtain the original audio data for playing.

Stage 330 can also be referred to as Drivers Kernel Mode Protected Environment. In stage 330, the first driver 162 of the graphics processor 120 decrypts the second encrypted video stream to obtain a second video stream, and the graphics processor 120 and/or the first driver 162 will stream the second video stream. Decode to get the original video material. In the hardware/software architecture of the display system 100, after the graphics processor 120 decodes the decrypted video stream, the original video data obtained is stored in the second memory unit 150. It should be noted that the original video data transmitted in the above data path is unencrypted. At this time, the second driver 163 of the USB display device 170 sends a request signal to the first driver 162, so that the first driver 162 is required to transmit the unprotected original video data to the second driver through the graphics processor 120. 163, and enters stage 340.

It should be noted that in stages 310-320, they are all part of the software, that is, the processor 110 is used to perform related encryption and decryption operations. The graphics processor 120 also has a dedicated hardware circuit (such as an H.264 decoder) to decode the video stream, but still needs to be controlled by the first driver 162 for operation. Work. In more detail, in the core mode in stage 330, the first driver 162 decodes the video stream (eg, H.264 video stream) using the processor 110 and the graphics processor 120. In other words, both the graphics processor 120 and the first driver can be used to decode the video stream.

In stage 340, the second driver 163 encrypts the original video data from the first driver 162 with the processor 110 (eg, using AES encryption) and transmits the encrypted original video material to the USB display device 170. The USB display device 170 decodes the received original video data, and transmits the decoded original video data to a display (not shown) through an analog display interface or a digital display interface, and proceeds to stage 350. Since the USB display device 170 can decrypt the received encrypted original video data to obtain the original video data, the USB display device 170 can display the original video data on the display through the analog display interface or the digital display interface. This means that it is not necessary to reduce the display of the image with high image quality. In stage 350, the display can directly play the original video material from the USB display device 170. It will be apparent to those skilled in the art that the present invention may also select a conventional manner to decode a video stream through the graphics processor 120 or its first driver 162 to obtain video data, and the graphics processor 120 transmits an analog display interface ( For video content with high image resolution with content protection, the resolution must be reduced or the digital display interface is used to play video data on the display.

4 is a flow chart showing a display method for display system 100 in accordance with an embodiment of the present invention. Please also refer to Figures 1 and 4. In step S410, the processor 110 is configured to first encrypt the video stream by using one of the first encryption and decryption standards (for example, AACS Advanced Access Content System encryption and decryption standard). Decrypting to obtain a first video stream (such as an H.264 video stream), and encrypting the first video stream with a second encryption and decryption standard (such as AES advanced encryption and decryption standard) to obtain a second encrypted video stream. In step S420, the processor 110 executes the first driver 162 to decrypt the second encrypted video stream to obtain a second video stream (for example, an H.264 video stream). In step S430, the graphics processor 120 and the first driver 162 decode the second video stream to obtain a video material. In step S440, the second driver 163 encrypts the decoded video data through the processor 110 to obtain the encrypted video data, and transmits the encrypted video data to the USB display device 170. In step S450, the USB display device 170 decrypts the received encrypted video material to obtain the original video material. In step S460, the USB display device 170 can play the decrypted video data on a display.

Figure 5 is a flow chart showing a display method for display system 200A or 200B in accordance with another embodiment of the present invention. Please refer to FIG. 2 and FIG. 5 at the same time. In this embodiment, the display system 200A is taken as an example. Those skilled in the art can understand how to apply the operation of the display system 200A to the display system 200B. In step S510, the first core 211A of the processor 210A decrypts the first encrypted video stream in one of the first encryption and decryption standards (for example, the AACS Advanced Access Content System encryption and decryption standard) to obtain a first video stream (for example, H.264 video stream), and encrypting the first video stream with a second encryption and decryption standard (such as AES advanced encryption and decryption standard) to obtain a second encrypted video stream. In step S520, the first core 211A of the processor 210A executes the first driver 262A to decrypt the second encrypted video stream to obtain a second video stream (for example, an H.264 video stream). In step S530, the second core 212A of the processor 210A and the first driver 262A pair The two video streams are decoded to obtain a video material. In step S540, the second driver encrypts the decoded video data through the first core 211A of the processor 210A to obtain the encrypted video data, and transmits the encrypted video data to the USB display device 270A. In step S550, the USB display device 270A decrypts the received encrypted video material to obtain video data. In step S560, the USB display device 270A can play the decrypted video data on a display.

It should be noted that the flow of the display methods of FIGS. 4 and 5 only describes how the display systems 100 and 200A/200B play video content with content protection through the USB display device. The data path of the unprotected video stream or the original video data in the display systems 100 and 200A/200B has been disclosed in the foregoing embodiments, and details are not described herein.

The present invention has been disclosed in the above preferred embodiments, and is not intended to limit the scope of the present invention. Any one of ordinary skill in the art can make a few changes without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

100, 200A, 200B‧‧‧ display system

110, 210A, 210B‧‧‧ processor

120, 220B‧‧‧ graphics processor

130, 230A‧‧‧ chipsets

131, 231A‧‧‧ Northbridge

132, 232A‧‧‧ South Bridge Wafer

133‧‧‧Internal busbar

140‧‧‧First memory unit

150‧‧‧Second memory unit

160, 260A, 260B‧‧‧ storage unit

161, 261A, 261B‧‧‧ operating system

162, 262A, 262B‧‧‧ first driver

163, 263A, 263B‧‧‧ second driver

164, 264A, 264B‧‧‧ media files

170, 270A, 270B‧‧‧ USB display device

180‧‧‧External CD player

211A, 211B‧‧‧ first core

212A, 212B‧‧‧ second core

213B‧‧‧ integrated memory controller

240A, 240B, 250B‧‧‧ memory unit

290‧‧‧ Platform Control Hub

310-350‧‧‧ stage

1 is a functional block diagram of a display system 100 in accordance with an embodiment of the present invention.

Figure 2A is a functional block diagram showing a display system 200A in accordance with another embodiment of the present invention.

2B is a functional block diagram showing a display system 200B in accordance with still another embodiment of the present invention.

Figure 3 is a schematic diagram showing the software/hardware architecture of display system 100 in accordance with an embodiment of the present invention.

4 is a flow chart showing a display method for display system 100 in accordance with an embodiment of the present invention.

Figure 5 is a flow chart showing a display method for display systems 200A and 200B in accordance with another embodiment of the present invention.

100‧‧‧Display system

110‧‧‧ processor

120‧‧‧graphic processor

130‧‧‧chipset

131‧‧‧ North Bridge Chip

132‧‧‧South Bridge Chip

133‧‧‧Internal busbar

140‧‧‧First memory unit

150‧‧‧Second memory unit

160‧‧‧storage unit

161‧‧‧ operating system

162‧‧‧First driver

163‧‧‧Second driver

164‧‧‧Media files

170‧‧‧USB display device

180‧‧‧External CD player

Claims (10)

A display system includes: a processor for decrypting a first encrypted video stream by a first encryption and decryption standard to obtain a first video stream, and using the second encryption and decryption standard for the first video stream Encrypting to obtain a second encrypted video stream; a graphics processor; a USB display device; a storage unit including a first driver of the graphics processor and a second driver of the USB display device; and a chip a group coupled to the processor, the graphics processor, the USB display device, and the storage unit; wherein the processor is configured to execute the first driver of the graphics processor to decrypt the second encrypted video stream to obtain a a second video stream, wherein the graphics processor and the first driver decode the second video stream to obtain a first video data; wherein the processor further executes the second driver of the USB display device, Encrypting the first video data obtained by the decoding to obtain an encrypted video data, and transmitting the encrypted video data to the USB display device; wherein the USB display device further encrypts the data Decrypting information data to obtain a second video data, and the second video data to a display of the obtained playback. The display system of claim 1, wherein the first video stream is stored in a first memory unit of the display system. The display system of claim 1, wherein the first video data obtained by decrypting the second video stream is stored in the A second memory unit used by the graphics processor. A display system, comprising: a processor, comprising a first core and a second core, wherein the first core is configured to decrypt a first encrypted video stream by using a first encryption and decryption standard to obtain a first Video stream, and encrypting the first video stream with a second encryption and decryption standard to obtain a second encrypted video stream; a USB display device; a storage unit including a first driver of the second core and the USB a second driver of the display device; and a platform hub controller coupled to the processor, the USB display device, and the storage unit; wherein the first core executes the first driver pair of the second core Decoding the second encrypted video stream to obtain a second video stream; wherein the second core and the first driver program decode the second video stream to obtain a video data; wherein the first core further executes the USB The second driver of the display device encrypts the decoded first video data to obtain an encrypted video data, and transmits the encrypted video data to the USB display device; wherein the USB Illustrates device further decrypts the encrypted video data to obtain a second video data, and the second video data to a display of the obtained playback. The display system of claim 4, further comprising: a memory unit, wherein the processor further comprises an integrated memory controller electrically connected to the memory unit for the first core and The second core controls data access of the memory unit, wherein the first video stream It is stored in this memory unit. The display system of claim 4, further comprising: a graphics processor; and a second memory unit electrically connected to the graphics processor, wherein the second core and the graphics processor are further The second video stream is decoded together to obtain the first video data. The display system of claim 6, wherein the first video data obtained by decrypting the second video stream is stored in the memory unit. A display method for a display system, the display system comprising: a processor, a graphics processor, a USB display device, a storage unit, and a chip set, wherein the storage unit includes one of the graphics processors a driver and a second driver of the USB display device, and the chipset is coupled to the processor, the graphics processor, the USB display device, and the storage unit, the method comprising: using the processor pair Decrypting the first encrypted video stream to obtain a first video stream, and encrypting the first video stream by a second encryption and decryption standard to obtain a second encrypted video stream; using the processor The first driver executing the graphics processor decrypts the second encrypted video stream to obtain a second video stream; using the graphics processor and the first driver to decode the second video stream to obtain a first a video data, using the processor to execute the second driver of the USB display device, encrypting the decoded first video data to obtain an encrypted video data, and The encrypted data transmitted to the USB video display device; The encrypted video data is decrypted by the USB display device to obtain a second video data; and the second video data obtained by the USB display device is played on a display. A display method for a display system, the display system comprising: a processor, a USB display device, a storage unit, and a chipset, wherein the processor includes a first core and a second core, the storage unit The first driver of the second core and the second driver of the USB display device, and the chipset is coupled to the processor, the USB display device, and the storage unit, the method includes: utilizing the The first core decrypts the first encrypted video stream by using one of the first encryption and decryption standards to obtain a first video stream, and encrypts the first video stream by a second encryption and decryption standard to obtain a second encrypted video stream. Decrypting the second encrypted video stream by using the first core to execute the second driver to obtain a second video stream; using the second core and the first driver to the second video stream Decoding to obtain a first video data; using the first core to execute the second driver of the USB display device, encrypting the decoded first video data to obtain an encrypted video And transmitting the encrypted video data to the USB display device; decrypting the encrypted video data by the USB display device to obtain a second video data; and using the USB display device to play the display on the display Second video information. A display method for a display system, the display system package The invention includes a processor, a USB display device, a storage unit, a memory unit and a platform control hub, wherein the processor comprises a first core, a second core and an integrated memory controller, the storage unit The first driver of the second core and the second driver of the USB display device, and the platform control hub is coupled to the processor, the USB display device and the storage unit, and the method includes: utilizing The first core pair decrypts the first encrypted video stream by using a first encryption and decryption standard to obtain a first video stream, and encrypts the first video stream by using a second encryption and decryption standard to obtain a second encrypted video. Using the first core to execute the second driver, the first driver to decrypt the second encrypted video stream to obtain a second video stream; using the second core and the first driver to the second video Decoding the stream to obtain a first video data; using the first core to execute the second driver of the USB display device, encrypting the decoded first video data to obtain a And the encrypted video data is transmitted to the USB display device; the encrypted video data is decrypted by the USB display device to obtain a second video data; and the USB display device is played on a display. The second video material.