公开(公告)号：US09467752B2

公开(公告)日：2016-10-11

申请号：US14484848

申请日：2014-09-12

Applicant: Broadcom Corporation

Inventor： Xuemin Chen ,  Jiang Fu ,  David P. Bogosh

IPC: H04L27/06 ,  H04N21/8547 ,  H04N7/173 ,  H04N5/06 ,  H04N21/43 ,  H04N21/44 ,  H04N21/472

CPC classification number: H04N21/8547 ,  H04N5/06 ,  H04N7/173 ,  H04N7/17309 ,  H04N21/4305 ,  H04N21/4307 ,  H04N21/44008 ,  H04N21/47217

Abstract: A system, method, and apparatus for handling transition errors is presented herein. The transition errors include handling unreported time base discontinuities during trick mode transition, miscalculated time stamps during trick mode transition, erroneous sequence end codes, and unreported broken group of picture transmission. Unreported time base discontinuities are detected by comparing the program clock reference (PCR) value of the data packet to the system time clock (STC). If the difference exceeds a predetermined threshold, the STC is set to the PCR value. Miscalculated time stamps are detected by examining the difference in PTS values between temporally adjacent data packets. If the difference is not within a margin of error from predetermined value, the PTS is disabled. Unreported broken groups of pictures are handled by skipping the first two B-frames of the first group of pictures following a trick mode transition. Erroneous sequence end codes are detected by determining whether a packet containing a sequence end code is associated with a time base change. If the packet is not associated with a time base change, the sequence end code is disregarded.

Abstract translation: 本文介绍了一种处理转换错误的系统，方法和装置。 转换错误包括在特技模式转换期间处理未报告的时基不连续性，在特技模式转换期间的错误计时时间戳，错误序列结束代码和未报告的断开的图像传输组。 通过将数据包的程序时钟参考（PCR）值与系统时钟（STC）进行比较来检测未报告的时基不连续性。 如果差异超过预定阈值，则将STC设置为PCR值。 通过检查时间上相邻的数据包之间的PTS值的差异来检测错误计时时间戳。 如果差异不在预定值的误差范围内，则PTS被禁用。 通过在特技模式转换之后跳过第一组图像的前两个B帧来处理未报告的断开的图像组。 通过确定包含序列结束码的分组是否与时基变化相关联来检测错误的序列结束码。 如果分组不与时基变化相关联，则忽略序列结束代码。

公开(公告)号：US20150055014A1

公开(公告)日：2015-02-26

申请号：US14484848

申请日：2014-09-12

Applicant: Broadcom Corporation

Inventor： Xuemin Chen ,  Jiang Fu ,  David P. Bogosh

IPC: H04N21/8547 ,  H04N21/44 ,  H04N21/43 ,  H04N7/173 ,  H04N5/06

CPC classification number: H04N21/8547 ,  H04N5/06 ,  H04N7/173 ,  H04N7/17309 ,  H04N21/4305 ,  H04N21/4307 ,  H04N21/44008 ,  H04N21/47217

Abstract: A system, method, and apparatus for handling transition errors is presented herein. The transition errors include handling unreported time base discontinuities during trick mode transition, miscalculated time stamps during trick mode transition, erroneous sequence end codes, and unreported broken group of picture transmission. Unreported time base discontinuities are detected by comparing the program clock reference (PCR) value of the data packet to the system time clock (STC). If the difference exceeds a predetermined threshold, the STC is set to the PCR value. Miscalculated time stamps are detected by examining the difference in PTS values between temporally adjacent data packets. If the difference is not within a margin of error from predetermined value, the PTS is disabled. Unreported broken groups of pictures are handled by skipping the first two B-frames of the first group of pictures following a trick mode transition. Erroneous sequence end codes are detected by determining whether a packet containing a sequence end code is associated with a time base change. If the packet is not associated with a time base change, the sequence end code is disregarded.

Abstract translation: 本文介绍了一种处理转换错误的系统，方法和装置。 转换错误包括在特技模式转换期间处理未报告的时基不连续性，在特技模式转换期间的错误计时时间戳，错误序列结束代码和未报告的断开的图像传输组。 通过将数据包的程序时钟参考（PCR）值与系统时钟（STC）进行比较来检测未报告的时基不连续性。 如果差异超过预定阈值，则将STC设置为PCR值。 通过检查时间上相邻的数据包之间的PTS值的差异来检测错误计时时间戳。 如果差异不在预定值的误差范围内，则PTS被禁用。 通过在特技模式转换之后跳过第一组图像的前两个B帧来处理未报告的断开的图像组。 通过确定包含序列结束码的分组是否与时基变化相关联来检测错误的序列结束码。 如果分组不与时基变化相关联，则忽略序列结束代码。