EP2126682A1 - Video data transmission via usb interface - Google Patents
Video data transmission via usb interfaceInfo
- Publication number
- EP2126682A1 EP2126682A1 EP08734620A EP08734620A EP2126682A1 EP 2126682 A1 EP2126682 A1 EP 2126682A1 EP 08734620 A EP08734620 A EP 08734620A EP 08734620 A EP08734620 A EP 08734620A EP 2126682 A1 EP2126682 A1 EP 2126682A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- data
- video
- transmitted
- usb
- fifo memory
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/12—Synchronisation between the display unit and other units, e.g. other display units, video-disc players
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/083—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical and the horizontal blanking interval, e.g. MAC data signals
Definitions
- the present invention relates to a method for transmitting video data from a data source to a data sink, wherein the transmission is via a USB interface, and an apparatus for performing the method.
- Multimedia data in the form of digitized images and sounds are used in almost all technical fields, whereby the resolution and compression of the image data for transmission are subject to very different requirements. If the digital images are to meet high demands, only a relatively small amount of compression is allowed before the transmission, because with increasing compression information is lost and the image quality suffers. For normal video, the required amount of data is usually several megabytes per frame to ensure good picture quality.
- the transmission of these large amounts of data, as well as the advantageous preparation of the data for fast and efficient use are known in the art.
- DE 101 20 806 B4 describes an apparatus and a method for the transmission of multimedia data objects from a central data source via a data network to a plurality of terminals, preferably television sets, which are connected via an auxiliary device to the data network, these from the central data source be implemented via a central Einspeisege- device in a suitable format for data transmission and fed into the data network, wherein it is a central transceiver is a transcoder, which digitized from the central data source data objects and converted into a digital data stream and this data stream via an interface continuously feeds into the data network and is transmitted to the connected auxiliary devices.
- a central transceiver is a transcoder, which digitized from the central data source data objects and converted into a digital data stream and this data stream via an interface continuously feeds into the data network and is transmitted to the connected auxiliary devices.
- These method steps are usually implemented in video compression in a decorrelated image transformation, an optionally lossy quantization and a lossless entropy coding.
- Examples of such decorrelating transformations are the discrete crete cosine transformation (DCT) or the discrete wavelet transformation (DWT).
- the discrete cosine transform is commonly used in video coding methods such as MPEG or digital television as a decorrelating transformation.
- the discrete wavelet transformation is used in the new image compression standard JPEG2000. This is general state of the art, as described, for example, in DE 699 07 929 T2, DE 696 32 622 T2, DE 601 19 499 T2 or DE 692 10 698 T2.
- the transmission of multimedia data is usually carried out with the above-mentioned coding / decoding method.
- the reason for this is also the limited capacity of storage media and the limited transmission possibility by means of a network.
- encoding and decoding requires additional hardware, making the devices expensive to manufacture and acquiring additional licenses for the encoding and decoding processes.
- At least one memory module as well as an encoding chip or a signal processing unit are required for the hardware-specific implementation of the coding or decoding method.
- the hardware is then usually limited to one or more formats for data transmission.
- a USB (Universal Serial Bus) interface is a special interface of a computer, which is used in particular for connecting and disconnecting peripheral devices, such as the keyboard, mouse and storage, so-called USB sticks.
- the associated data processes are state of the art and known for example from DE 199 00 345 Al.
- the DE 102 11 054 A1 describes a USB host controller for handling the data traffic between at least one USB device and a system memory of a computer system.
- the USB host controller comprises a data collector for fetching data items from the system memory, a storage means for storing the fetched data items, and a transaction processing means for processing transactions sent to or received from the USB apparatus in response to the fetched ones Data elements stored in the storage device.
- the USB interface can transmit data at different transmission rates.
- the data can be transmitted in different transmission modes, such as bulk mode, isochronous mode, transfer or interrupt mode.
- USB 2.0 In bulk mode, up to 480 Mbytes / s are available for the USB 2.0 standard. These can be transferred over several pipes from the USB controller.
- the data transfer per pipe in bulk mode is about 20 packets, each with 512 bytes per microframe, a total of up to 8,000 microframes can be sent. This results in a maximum transfer rate of about 82 MB / s. If the full transfer rate is assigned to a connected USB device, video can be transmitted uncompressed via the USB interface in bulk mode without any problems. However, if several USB devices are connected to one computer and data is transmitted via the individual USB interfaces at the same time, the available and allocated bandwidth for each individual USB device quickly drops below a critical value and undesirable transmission errors occur the bulk mode only works in the handshake procedure.
- USB device If a USB device transmits in Bulk mode, other USB devices can be operated in another mode, such as isochronous mode. In this case, the I-synchronous mode always has priority, so that during the data transfer to or from the USB interface connected in isochronous mode. Device is not capable of transmitting data for the Bulk-mode USB device.
- Isochronous mode has been introduced as a mode for time critical data transmission, e.g. Streaming audio / video files.
- the disadvantage of isochronous mode is that the bandwidth for each isochronous mode USB device is limited to a maximum of 24.5 MBytes / s.
- the development of the YUV color model goes back to the development of analogue color television in the PAL standard. It is also used today in analogue NTSC color television. Each pixel is determined thereby the brightness (luminance) and the color (chrominance).
- the data can be generated in YUV image data format 4: 2: 0, 4: 2: 2 or 4: 4: 4.
- the use of a YUV image data format offers the advantage that the image data formats required for a TV set (PAL / SECAM / NTSC) can be easily generated thereby. For standard video, a system with fixed sampling of the individual pictures with a frequency of 13.5 MHz has been established.
- the invention is based on the idea to transfer the data in uncompressed form in YUV format via the USB interface.
- the data received from the USB device are only fed to a commercially available video DAC, so that the video data can be fed directly to a TV as a PAL or NTSC signal.
- a commercially available video DAC so that the video data can be fed directly to a TV as a PAL or NTSC signal.
- the invention provides several embodiments for data transmission via the USB interface.
- a first embodiment of the invention provides that the complete YUV video signal is transmitted in bulk mode and supplied to the video DAC.
- the computer always monitors as sending data source, whether a sufficiently large bandwidth for the connected and receiving USB device is present. If there is not enough bandwidth available in bulk mode or if other USB devices work in a bulk mode preferred mode, it is possible to automatically switch to isochronous mode, in which case the data from the blanking blocks will not be transferred, or will only be transmitted incompletely are refilled after receiving the remaining image data from the USB device, so that a complete image signal is supplied to the downstream video DAC.
- USB transfer mode that is the lowest priority in the system.
- isochronous mode was introduced, which defines a certain data rate at a certain time.
- a second possible embodiment of the invention provides that the YUV image data are always transmitted in isochronous mode via the USB interface, in which case the data of the blanking interval is either not transmitted at all or only partially transmitted. After receiving the remaining image data, the USB device then fills the missing data words of the blanking interval back into the received data stream, so that a complete image signal is again fed to the downstream video DAC.
- the excision of the entire blanking interval preferably the horizontal blanking interval, or only a part thereof, is performed in the data source or the computer.
- the transmitted data ends up in a buffer of the USB controller of the data sink connected to the data source in the form of a USB device.
- the cache is typically a FIFO memory, i. the data which was first written to the FIFO memory is also read out first.
- a complete line of a video image consists of 1728 data words in the PAL system and 1732 data words in the NTSC system. Of these, 1440 data words are in the visible range in the PAL system. For control, 2x4 data words are required per line. This results in 1448 to be transmitted data word per image line in the PAL system. The remaining 280 data words (bytes) correspond to the length of the horizontal blanking interval and do not have to be transmitted. That is, when cutting out these data words no image information is lost. However, it must be ensured that the 1728 data words are returned to the PAL system on the USB device per line for the video DAC, as long as synchronization of the video signal is to be maintained.
- the data sink or its USB controller generates the missing data for the blanking gap itself.
- the clock differences between the data source and the data sink must be balanced, as the PC and USB device both have a separate clock, both of which never exactly match the nominal reference clock of 27 MHz to run.
- deviations in the system clocks result in different data rates which lead to an overflow or underflow on the USB controller because it only has 8 KB of memory.
- the clock differences are compensated in the first variant via a synchronization of data source and data sink.
- the different data rate resulting from the different system clocks is compensated as follows, if the horizontal blanking gap is not transmitted:
- the USB controller calculates the clock difference by measuring the length of each transmitted image line of a frame. This value of each line is sent back to the PC.
- the PC can compensate for the down-to-up variance of the data rate by varying the line length by sending more or less data for the next frame. It does not matter whether all the data of the blanking gap or only part of it is not transmitted.
- the USB controller on the data sink generates the remaining data for the blanking gap to bring the data rate to exactly 27 MByte / s for the Video DAC. This synchronization always adjusts itself with some latency.
- the USB controller calculates the clock difference and testifies to the missing data.
- the vertical blanking gap may contain additional control data.
- the video DAC will generally not be able to produce a stable PAL image. For this reason, the synchronization over the horizontal blanking gap is preferable.
- the control data contained in the data stream is used to inform the sending USB controller which data it should transmit to the USB device and which is not.
- the USB controller of the receiving USB device, or its FIFO memory is controlled on the basis of the control data present in the data stream, such as the end-of-line signal. For this purpose, in particular the respectively last byte or data word read from the FIFO memory is checked to see whether it corresponds to the line end signal. If the end-of-line signal is detected, the reading of the FIFO memory is stopped and the USB controller or an additional data generator generates blanking data data words, which are fed to the video DAC in a continuous sequence.
- the image information of the next image line remains in the FIFO memory. If the FIFO memory is not yet completely filled, it is filled up by the USB controller with subsequent video data via the USB interface. Once a sufficient number of blanking data has been sent to the video DAC, reading of the FIFO memory is started again. If the entire blanking gap is not transmitted, the PAL system always has to stop reading the FIFO memory for 280 cycles and generate the blanking data. If some of the blanking data are sent via the USB interface, their number must be known or analyzed by the USB device, so that the FIFO memory can be stopped for a corresponding number of cycles and the missing blanking data can be generated. By the firm binding of the FIFO control to the control words for visible areas, in particular the line end data, as well as the generation of the data pattern for the missing blanking gap, advantageously a stable video output is guaranteed.
- the generation of the blanking data and the control of the FIFO memory can be done very easily by means of a programmable logic device. It is also possible to use a "Complex Programmable Logic Device", a so-called CPLD.
- Fig. 1 Connection between computer, USB device and TV set;
- Fig. 2 Structure of a digital YUV video signal
- FIG. 3 shows a block diagram of the data stream from the data source to the data sink
- Fig. 5 YUV signal data and memory assignment of the FIFO memory of the USB controller of the USB device
- FIG. 6 shows a block diagram for the synchronization between the data source and the data sink.
- FIG. 1 shows the connection between a computer 1 with monitor Ia connected thereto and a USB device 2 which is connected to the computer 1 by means of a USB cable 3.
- a USB device 2 On the USB device 2 is by means of a video cable 4, for example, an S-video connection, a PAL or NTSC TV 5 connected.
- the video cable 4 can of course also be replaced by an AV radio link, so that the USB device 2 and the TV set 5 can be located in different rooms.
- the USB connection is at least a USB 2.0 connection and can also be a standard USB 3.0 wireless USB connection.
- FIG. 2 shows the basic structure of the digitized YUV video signal for a video image.
- the video image is transmitted in two image halves, the top field and the bottom field.
- the top-field is transmitted, which is 720 pixels long.
- image information follows an EAV signal.
- SAV start of active video
- the vertical blanking lug "VBI” is transmitted, followed by the bottom field and another vertical blanking lug "VBI". This is a complete video image transmitted and it begins the transmission of the next video image.
- FIG. 3 shows a block diagram of the data stream of the video signal.
- multimedia data in AVI format is fed to an AVI splitter, which divides the multimedia data into a video and an audio data stream.
- the USB client Renderer 8 converts the AVI video data into the YUV signal and passes it to the Cypress USB driver 10, which also receives the audio data rendered by the Direct Sound Renderer 9.
- the data for the horizontal blanking gap are either suppressed in the USB client renderer 8 or first in the Cypress USB driver, ignored or not transferred.
- the video and audio data are transmitted to the streaming client or the data sink 12.
- data, in particular control data from the streaming client 12 can be transmitted back to the computer 6, 7, 8, 9 in order to control the multimedia data supplied to the AVI splitter 6.
- the streaming client 12 reads the transmitted video and audio data and feeds it directly or via a video DAC its video and audio outputs 13.
- FIG. 4 shows a block diagram of the streaming client 12 already described with reference to FIG. 3.
- the streaming client 12 receives the video and audio data via the USB interface 11.
- the USB HUB 14 supplies the audio data 14a to the USB audio controller 15 and the video data 14v to the USB video controller 18.
- the incoming data is written in the FIFO 20, from where it is output to an 8-bit bus 21.
- the MPU 19 controls the FIFO 20 based on the data being read.
- the reading of the FIFO 20 is stopped and the freely programmable logic generated for a given number of clock data words that match the blanking gap of the YUV signal (value pairs "black") and with a frequency of 27 MByte / s
- the video encoder (video DAC) 24 is then fed in. Thereafter, the reading out of the FIFO 20 is restarted and the read-out data are likewise supplied to the video encoder 24 at 27 MB / s until the EAV signal from the FIFO 20 is again supplied
- the analog video signal prepared for the PAL or NTSC system is present at the output 13v of the video encoder 24. Control commands can be transmitted from the connected television set or via the remote control to the streaming client 12 via the I2C bus 25 which transmits these commands via the USB interface 11 to the computer for further processing.
- the data 23 are supplied to the video encoder 24 at a band rate of 27 MB / s.
- the visible data and control data are transmitted to the FIFO at a lower transmission rate, so that theoretically the FIFO became empty.
- the FIFO 20 can be replenished during this time, as shown in FIG.
- FIG. 6 shows the synchronization of the data streams in the PC and in the USB device (FX2LP-ADV7179) for the first variant, in which the control data EAV and SAV are not used in the control of the USB controller of the USB client 2.
- the PC and the USB device both have a separate clock (Clock I and Clock II), both of which never exactly run with the nominally specified reference clock of 27 MHz.
- the deviations in the system clocks result in different data rates, which lead to an overflow or underflow on the USB controller (FX2LP) because it only has 8 KB of memory.
- the clock differences in the first variant are synchronized balanced from data source and data sink.
- the different data rate resulting from the different system clocks is compensated as follows:
- the USB controller calculates the clock difference by measuring the length of each transmitted image line of a frame. This value of each line is sent back to the PC.
- the PC can compensate for the downward / upward deviation of the data rate by varying the line length by sending more or less data for the next frame. It does not matter whether all data of the blanking gap or only part of it is not transmitted.
- the data sink's USB controller generates the remaining blanking data to bring the data rate to exactly 27 MByte / s for the Video DAC. This synchronization always adjusts itself with some latency.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08734620A EP2126682A1 (en) | 2007-03-26 | 2008-03-14 | Video data transmission via usb interface |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07090058 | 2007-03-26 | ||
PCT/EP2008/002078 WO2008116569A1 (en) | 2007-03-26 | 2008-03-14 | Video data transmission via usb interface |
EP08734620A EP2126682A1 (en) | 2007-03-26 | 2008-03-14 | Video data transmission via usb interface |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2126682A1 true EP2126682A1 (en) | 2009-12-02 |
Family
ID=39575992
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08734620A Withdrawn EP2126682A1 (en) | 2007-03-26 | 2008-03-14 | Video data transmission via usb interface |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100057972A1 (en) |
EP (1) | EP2126682A1 (en) |
CN (1) | CN101681243A (en) |
BR (1) | BRPI0809354A2 (en) |
WO (1) | WO2008116569A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011197743A (en) * | 2010-03-17 | 2011-10-06 | Sony Corp | Information processing apparatus, information processing method and program |
CN101883273B (en) * | 2010-06-12 | 2013-08-21 | 北京国科环宇空间技术有限公司 | Synchronization method when decomposing digital signal |
CN102932668B (en) * | 2012-11-29 | 2016-07-06 | 济南中维世纪科技有限公司 | A kind of audio, video data based on USB transmission processes device |
CN102932669B (en) * | 2012-11-29 | 2016-06-29 | 济南中维世纪科技有限公司 | A kind of audio and video data processing method based on USB transmission and device |
WO2016175480A1 (en) * | 2015-04-30 | 2016-11-03 | Samsung Electronics Co., Ltd. | Electronic device, adapter device, and video data processing method thereof |
KR102422201B1 (en) * | 2015-04-30 | 2022-07-19 | 삼성전자주식회사 | Electronic device, adapter device and video data processing method thereof |
CN104883552B (en) * | 2015-05-22 | 2017-01-11 | 深圳市载德光电技术开发有限公司 | YUV (Luma and Chroma) coded format-based image adjusting method and system |
CN105898314A (en) * | 2015-12-03 | 2016-08-24 | 乐视致新电子科技(天津)有限公司 | Method converting USB format video data to HDMI format video data, device and system |
US11200188B1 (en) | 2020-07-10 | 2021-12-14 | Logitech Europe S.A. | Operating system agnostic wireless multimedia dongle |
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US4885632A (en) * | 1988-02-29 | 1989-12-05 | Agb Television Research | System and methods for monitoring TV viewing system including a VCR and/or a cable converter |
GB2226469A (en) * | 1988-12-23 | 1990-06-27 | Marconi Gec Ltd | Video recording and reproducing apparatus |
GB2273584B (en) * | 1992-12-16 | 1997-04-16 | Quantel Ltd | A data storage apparatus |
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JP3004618B2 (en) * | 1998-02-27 | 2000-01-31 | キヤノン株式会社 | Image input device, image input system, image transmission / reception system, image input method, and storage medium |
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GB0008691D0 (en) * | 2000-04-07 | 2000-05-31 | Post Impressions Systems Ltd | Input and output systems for data processing |
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2008
- 2008-03-14 CN CN200880009918A patent/CN101681243A/en active Pending
- 2008-03-14 WO PCT/EP2008/002078 patent/WO2008116569A1/en active Application Filing
- 2008-03-14 BR BRPI0809354-7A patent/BRPI0809354A2/en not_active IP Right Cessation
- 2008-03-14 US US12/531,696 patent/US20100057972A1/en not_active Abandoned
- 2008-03-14 EP EP08734620A patent/EP2126682A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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Also Published As
Publication number | Publication date |
---|---|
BRPI0809354A2 (en) | 2014-09-02 |
WO2008116569A1 (en) | 2008-10-02 |
CN101681243A (en) | 2010-03-24 |
US20100057972A1 (en) | 2010-03-04 |
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