WO2003094532A1 - Flexible data partitioning and packetization for h.26l for improved packet loss resilience - Google Patents
Flexible data partitioning and packetization for h.26l for improved packet loss resilience Download PDFInfo
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- WO2003094532A1 WO2003094532A1 PCT/IB2003/001694 IB0301694W WO03094532A1 WO 2003094532 A1 WO2003094532 A1 WO 2003094532A1 IB 0301694 W IB0301694 W IB 0301694W WO 03094532 A1 WO03094532 A1 WO 03094532A1
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- packet
- coeff
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- partition mode
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/65—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using error resilience
- H04N19/66—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using error resilience involving data partitioning, i.e. separation of data into packets or partitions according to importance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/24—Systems for the transmission of television signals using pulse code modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
- H04N19/37—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability with arrangements for assigning different transmission priorities to video input data or to video coded data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
Definitions
- the present invention relates generally to data packetization, and more specifically to a partitioning and packetization scheme for the transmission of coded video, improvements in the data partitioning syntax, and the corresponding network adaptation layer (NAL) packetization process to enable flexible data partitioning in an H.26L protocol environment.
- NAL network adaptation layer
- wireless networks may be highly susceptible to interferences from other devices operating in the same frequency band, packet errors or losses may often result. This is particularly the case in an 802.1 lb wireless LAN environment, which utilizes the 2.4 GHz ISM band that is shared by microwaves, cordless phones and/or other 802.1 lb networks.
- Another challenge for transmitting video over an 802.1 lb networks is that the 802. lib media access (MAC) layer requires packets received with bit errors to be discarded, thereby limiting the possibility of error correction at the receiver.
- MAC media access
- the MAC layer and the application layer can provide unequal error protection (UEP) to certain packets to guarantee their on-time arrival. For example, at least 50% of all packets can be delivered virtually free of losses even under co-channel interference that degrades the channel throughput by 50%.
- UEP unequal error protection
- the combination of scalable or layered coding and transmission with UEP can make sure that the essential parts of video get through even under channel disturbances while the non-essential parts get through only if the channel has enough throughput.
- a partition ratio of around 50% base vs. 50% enhancement may be desirable for optimal video quality if the enhancement layer packets are lost. An overly low partition ratio will result in under-utilization of the UEP capability of the underlying network.
- the H.26L standard was introduced to achieve enhanced compression performance while providing a "network-friendly" video representation addressing "conversational” (video telephony) and “non-conversational” (storage, broadcast, or streaming) applications.
- the H.26L standard includes a Video Coding Layer (VCL), which provides the core high-compression representation of the video picture content, and a Network Adaptation Layer (NAL), which packages that representation for delivery over a particular type of network.
- VCL Video Coding Layer
- NAL Network Adaptation Layer
- H.26L (or Joint Video Team, or JVT, or MPEG-4 Video Part 10) specifies a data partitioning syntax in the byte stream (video elementary stream) that allows three fixed partition types: Partition A that contains header symbols of coded macroblocks; Partion B that contains coded block patterns and DCT data for intra blocks; and Partition C that contains coded block patterns and DCT data for inter blocks.
- H.26L also specifies a packetization process in the Network Adaptation Layer (NAL) that packetizes the three partitions into three packets.
- the three packets have different transport (such as RTP, or Real Time Transport Protocol) payload types, which will signal to the application layer or the underlying network transport layer to provide differentiated service or unequal error protection.
- transport such as RTP, or Real Time Transport Protocol
- the packets containing different partitions are depacketized and merged into a single bitstream (with multiple partitions) for decoding. While this system provides some level of resilience against packet losses, it has several drawbacks.
- the fixed partitioning and NAL packetization process do not allow any rate-distortion optimization of the partitioning operation. This will result in lower video quality (when enhancement layer data are lost) compared with flexible data partitioning where the partitioning point and the corresponding base versus enhancement layer packet boundary can be changed adaptively based on picture statistics.
- the fixed partitioning and packetization limits the ratio of base and enhancement layers to a small range determined by the amount of header and motion vector information versus DCT data. Because the H.26L standard is designed for multiple applications, such as home cinema and video streaming, the application or the underlying network will have varying capabilities for unequal error protection. A fixed ratio for base and enhancement layer partitions will not allow optimization of the overall system performance where unequal error protection is available.
- the invention addresses the above-mentioned problems, as well as others, by providing modifications to the VCL data partitioning syntax and the corresponding NAL packetization process to enable flexible data partitioning.
- the invention provides an H.26L coding system, comprising: a video coding layer (VCL) having a first partition mode and a second partition mode for partitioning video data, wherein the second partition mode separately partitions low and high frequency DCT coefficients; and a network adaptation layer (NAL) for packetizing data into a first and second packet, wherein the first packet is configured to contain low frequency DCT coefficients and the second packet is configured to contain high frequency DCT coefficients when the second partition mode is implemented by the VCL.
- VCL video coding layer
- NAL network adaptation layer
- the invention provides a method of partitioning and packetizing video data in an H.26L environment, comprising: providing a video coding layer (VCL) having a first partition mode and a second partition mode for partitioning video data; partitioning video data into the three partitions (A, B and C) when the first partition mode is selected; and partitioning video data into a first partition (containing header information and lower frequency DCT data) and a second partition (higher frequency DCT data) when the second partition mode is selected.
- VCL video coding layer
- the invention provides a program product stored on a recordable medium for packetizing and partitioning video data in an H.26L environment, comprising: a video coding layer (VCL) having a first partition mode and a second partition mode for partitioning video data; means for partitioning video data into three partitions (A, B and C) when the first partition mode is selected; and means for partitioning video data into a first partition (containing header information and lower frequency DCT data) and a second partition (higher frequency DCT data) when the second partition mode is selected.
- VCL video coding layer
- the invention provides a decoding system for decoding video data in an H.26L environment, wherein the video data was packetized in one of two schemes, including: a first scheme, wherein header data is packetized into a first packet type, coded block pattern and DCT data for intra blocks are packetized into a second packet type, and coded block pattern and DCT data for inter blocks are packetized into a third packet type; a second scheme, wherein header data and low frequency DCT coefficients are packetized into the first packet type and high frequency DCT coefficients are packetized into the second packet type; and wherein the decoding system includes: a depacketizer system for determining which of the first and second scheme was used, and for depacketizing video data from the packets; and a decoder for decoding the video data.
- Fig. 1 depicts an H.26L video transmission system in accordance with an embodiment of the present invention.
- Fig. 2 depicts a packetization boundary indication (PBI) field in accordance with an embodiment of the present invention.
- PBI packetization boundary indication
- H.26L encoding system 10 includes a Video Coding Layer (VCL) 12 and a Network Adaptation Layer (NAL) 16.
- VCL 12 includes a unique syntax to efficiently represent the content of the video data
- NAL 16 is defined to format that data and provide header information in a manner appropriate for conveyance by the higher-level system.
- the data is organized into data packets, each of which contains an integer number of bytes. These data packets are then transmitted in a manner defined by the NAL 16.
- VCL 12 includes a data partitioning system 14 that can partition based on one of two modes, i.e., Mode One (Ml) and Mode Two (M2).
- Mode One which comprises header vs. DCT data, is syntactically defined by the existing H.26L specification, where there are eight syntax element types in the VCL as follows:
- Mode Two which provides DCT partitioning, is added to provide enhanced partitioning flexibility.
- the NAL packetization scheme varies according to the partition mode used in the byte stream.
- partition Mode Two i.e., DCT partitioning, TYPE-COEFF_Y and
- TYPE_COEFF_C are each further divided into two new partitions that represent high and low frequency DCT coefficients. Namely, TYPE-COEFF_Y has been broken into TYPE_ COEFF_Y_L and TYPE_COEFF_Y_H; and TYPE_COEFF_C has been broken into TYPE_COEFF_C_L, and TYPE_COEFF_C_H. It should be understood that the selection of a naming convention for these new types could change without departing from the scope of the invention. Accordingly, for Mode Two, the data partitioning system provides 10 syntax element types as follows:
- PBI packetization boundary indication
- PBP packetization break point
- the second sub-field is partition type (PT) (1 bit), which is set to 0, with 1 being reserved.
- the third sub-field is DCT break point (DBP) (5 bits), which indicates the beginning of the index of the first DCT run-length VLC pair in TYPE_COEFF_X_H (where X is either Y or C).
- DCT DCT break point
- PBI which is pre-selected, identifies the boundary between high and low frequency DCT coefficients TYPE COEFF X L and TYPE_COEFF_X_H.
- the NAL packetization process creates two packets, wherein each packet includes several different types of partitioned data.
- a packetization scheme is selected based on which mode is implemented by the VCL 12.
- partition Mode One results in packetization Scheme One being implemented
- partition Mode Two results in packetization Scheme Two being implemented.
- NAL 16 can determine which scheme to use based on whether the TYPEJHEADER partition ends with a PBI field or not.
- packetization Scheme One (PI) is utilized, which reflects the scheme utilized in the current H.26L specification. As expected, all header and motion vector information are contained in Packet One, all infra coded block pattern and DCT data information are contained in Packet Two, and all inter coded block pattern (CBP) and DCT information are contained in Packet Three.
- the low frequency DCT coefficients are packetized in Packet One, while the high frequency DCT coefficients are packetized in Packet Two. Accordingly, flexible packetization is achieved. As is evident, changing the PBP value in the PBI field will alter the contents of the packets under Scheme Two. Accordingly, it should be appreciated that different variations can be achieved under Scheme Two.
- H.26L decoding system 18 which includes a depacketizing system 20 and a decoder 22. Prior to decoding, the packets are depacketized into the 8 (Packetization Scheme One) or 10 (Packetization Scheme Two) partitions for decoding.
- the decoder 22 fetches data from the right partition depending on which scheme, Scheme One (SI) or Scheme Two (S2), is implemented.
- systems, functions, mechanisms, methods, algorithms and modules described herein can be implemented in hardware, software, or a combination of hardware and software. They may be implemented by any type of computer system or other apparatus adapted for carrying out the methods described herein.
- a typical combination of hardware and software could be a general-purpose computer system with a computer program that, when loaded and executed, controls the computer system such that it carries out the methods described herein.
- a specific use computer containing specialized hardware for carrying out one or more of the functional tasks of the invention could be utilized.
- the present invention can also be embedded in a computer program product, which comprises all the features enabling the implementation of the methods and functions described herein, and which - when loaded in a computer system - is able to carry out these methods and functions.
- Computer program, software program, program, program product, or software in the present context mean any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: (a) conversion to another language, code or notation; and/or (b) reproduction in a different material form.
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- Multimedia (AREA)
- Signal Processing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004502637A JP2005524355A (en) | 2002-05-01 | 2003-04-23 | H.264 for improved packet loss recovery. 26L flexible data partitioning and packetization |
AU2003225482A AU2003225482A1 (en) | 2002-05-01 | 2003-04-23 | Flexible data partitioning and packetization for h.26l for improved packet loss resilience |
KR10-2004-7017584A KR20040106441A (en) | 2002-05-01 | 2003-04-23 | Flexible data partitioning and packetization for H.26L for improved packet loss resilience |
EP03747520A EP1504611A1 (en) | 2002-05-01 | 2003-04-23 | Flexible data partitioning and packetization for h.26l for improved packet loss resilience |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37718602P | 2002-05-01 | 2002-05-01 | |
US60/377,186 | 2002-05-01 | ||
US10/253,234 | 2002-09-24 | ||
US10/253,234 US20040057465A1 (en) | 2002-09-24 | 2002-09-24 | Flexible data partitioning and packetization for H.26L for improved packet loss resilience |
Publications (1)
Publication Number | Publication Date |
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WO2003094532A1 true WO2003094532A1 (en) | 2003-11-13 |
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PCT/IB2003/001694 WO2003094532A1 (en) | 2002-05-01 | 2003-04-23 | Flexible data partitioning and packetization for h.26l for improved packet loss resilience |
Country Status (6)
Country | Link |
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EP (1) | EP1504611A1 (en) |
JP (1) | JP2005524355A (en) |
KR (1) | KR20040106441A (en) |
CN (1) | CN1650637A (en) |
AU (1) | AU2003225482A1 (en) |
WO (1) | WO2003094532A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010239288A (en) * | 2009-03-30 | 2010-10-21 | Sony Corp | Information processing device and method |
WO2014068817A1 (en) * | 2012-10-31 | 2014-05-08 | パナソニック株式会社 | Audio signal coding device and audio signal decoding device |
-
2003
- 2003-04-23 JP JP2004502637A patent/JP2005524355A/en not_active Withdrawn
- 2003-04-23 KR KR10-2004-7017584A patent/KR20040106441A/en not_active Application Discontinuation
- 2003-04-23 CN CNA038097222A patent/CN1650637A/en active Pending
- 2003-04-23 EP EP03747520A patent/EP1504611A1/en not_active Withdrawn
- 2003-04-23 AU AU2003225482A patent/AU2003225482A1/en not_active Abandoned
- 2003-04-23 WO PCT/IB2003/001694 patent/WO2003094532A1/en not_active Application Discontinuation
Non-Patent Citations (4)
Title |
---|
ARAVIND R ET AL: "PACKET LOSS RESILIENCE OF MPEG-2 SCALABLE VIDEO CODING ALGORITHMS", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, IEEE INC. NEW YORK, US, vol. 6, no. 5, 1 October 1996 (1996-10-01), pages 426 - 435, XP000627031, ISSN: 1051-8215 * |
CUENCA P ET AL: "Techniques to increase MPEG-2 error resilience in the VBR video transmission over ATM networks", COMMUNICATIONS, 1998. ICC 98. CONFERENCE RECORD. 1998 IEEE INTERNATIONAL CONFERENCE ON ATLANTA, GA, USA 7-11 JUNE 1998, NEW YORK, NY, USA,IEEE, US, 7 June 1998 (1998-06-07), pages 869 - 873, XP010284774, ISBN: 0-7803-4788-9 * |
SULLIVAN G J ET AL: "USING THE DRAFT H.26L VIDEO CODING STANDARD FOR MOBILE APPLICATIONS", PROCEEDINGS 2001 INTERNATIONAL CONFERENCE ON IMAGE PROCESSING. ICIP 2001. THESSALONIKI, GREECE, OCT. 7 - 10, 2001, INTERNATIONAL CONFERENCE ON IMAGE PROCESSING, NEW YORK, NY: IEEE, US, vol. 3 OF 3. CONF. 8, 7 October 2001 (2001-10-07), pages 573 - 576, XP008004827, ISBN: 0-7803-6725-1 * |
WIEGAND T: "JOINT MODEL NUMBER 1, REVISION 1(JM-IRL)", ITU STUDY GROUP 16 - VIDEO CODING EXPERTS GROUP, XX, XX, 3 December 2001 (2001-12-03), pages 1,3 - 75, XP001086627 * |
Also Published As
Publication number | Publication date |
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JP2005524355A (en) | 2005-08-11 |
EP1504611A1 (en) | 2005-02-09 |
CN1650637A (en) | 2005-08-03 |
AU2003225482A1 (en) | 2003-11-17 |
KR20040106441A (en) | 2004-12-17 |
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