CN100463382C - 多媒体数据解码装置 - Google Patents
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Abstract
本发明公开了一种多媒体数据解码装置,目的在于:即使比特流中的解码用信息中存在标准违反值,也能对编码数据进行解码处理。它包括:解码处理部分(11)和控制部分(12)。解码处理部分(11)为一个对比特流(13)中的编码数据进行解码处理的部分,它具有从该比特流(13)中检测出同步字,并对跟在该同步字后的解码用信息进行解析,而从中抽出特定的任选项指定信息(14)的功能。控制部分(12),判断由解码处理部分(11)抽出的任选项指定信息(14)是否取了标准以外的违反值,且在任选项指定信息(14)取了违反值的情况下,它控制解码处理部分(11)而将该违反值置换为标准所规定的值。
Description
技术背景
本发明涉及一种按照所规定的标准对已编码的多媒体数据(音频/图像数据)的比特流进行解码的多媒体数据解码装置。
背景技术
我们已知:有一种多媒体数据的压缩标准,为取ISO(InternationalOrganization for Standardization:国际标准化机构)的专家组名而一般被称为MPEG1、2、4(Moving Picture Experts Group Phase 1、2、4)的标准。MP3(MPEG音频层3:audio layer 3)是一种在MPEG1中利用的音频压缩方式。另一方面,现在的DVD(Digital Video Disk)播放机采用的是MPEG2标准。
根据日本国公开专利公报特开平8—116314号中所公开的现有技术,在第2代EDTV(增强清晰度电视:Enhanced Definition Television),即在EDTV—II中,在对MPEG1音频比特流进行解码的时候,即使某一音频帧的帧头信息在传送系中出现了误差,也能防止由该误差而引发异音。它是这样得以实现的:即在检测出有误差的情况下,在对该音频帧中的编码数据进行解码处理之前,从EDTV—II数字音频格式的控制比特中抽出和MPEG1音频比特流的帧头信息共同拥有的比特信息,再用该帧头信息对MPEG1音频比特流的帧头信息进行修正。
发明内容
最近几年,下列情况不断增加,即用户利用个人电脑等将音乐数据压缩成MP3格式后,再将它存储到光盘中。很显然,因这样制成的光盘不能完全符合DVD播放机的标准,故在用DVD播放机重放该光盘时,就有可能出现问题。例如,因为当某一音频帧中的采样频率信息取了标准所未规定的违反值时,就不能对该音频帧中的编码数据进行解码处理了,故DVD播放机会出现以下现象:声音中断,最坏的情况声音根本就出不来。
本发明的目的,在于:按照所规定的标准对已编码的多媒体数据的比特流进行解码的多媒体数据解码装置,即使在该比特流中的解码用信息中存在标准违反值的情况下,也能对编码数据进行解码处理。
为达成上述目的,本发明采用了如下的有解码处理部分和控制部分的结构。换句话说,解码处理部分为一个对比特流中的编码数据进行解码处理的部分,它具有从该比特流中检测出同步字,并对跟在该同步字后的解码用信息进行解析,而从中抽出特定的任选项指定信息的功能。在由解码处理部分抽出的任选项指定信息取了标准所未规定的违反值的情况下,控制部分控制该解码处理部分以将该违反值置换为由标准规定的值并利用它进行解码处理。并且,所述任选项指定信息,至少为音频比特流中的采样频率信息、强调信息、比特率索引信息中之一,或者至少为视频比特流中的帧码信息、色度格式信息、视频格式信息中之一。
附图说明
图1为一表示本发明所涉及的多媒体数据解码装置的一个结构的方框图。
图2为一表示输入到图1所示的多媒体数据解码装置中的音频比特流的一个格式的图。
图3为一表示输入到图1所示的多媒体数据解码装置中的视频比特流的一个格式的图。
图4为一流程图,示出了图1所示的多媒体数据解码装置的大致工作顺序。
图5为一流程图,示出了在图2中的比特率索引信息中存在标准违反值的情况下,如何对图4中的标准违反数据进行置换处理的一个详细顺序。
具体实施方式
下面,参考附图,对本发明中的实施例进行说明。
图1示出了本发明所涉及的多媒体数据解码装置的一个结构。图1中的多媒体数据解码装置10,例如为一装在DVD播放机中的装置,它包括:解码处理部分11和控制部分12。解码处理部分11,为一接收比特流(音频比特流或者视频比特流)13并对该比特流13中的编码数据进行解码处理的部分。它具有从该比特流13中检测出同步字,并对跟在该同步字后的解码用信息进行解析,而从中抽出特定的任选项指定信息14的功能。控制部分12判断由解码处理部分11抽出的任选项指定信息14是否取了DVD播放机的标准中所未规定的违反值,且在任选项指定信息14取了违反值的情况下,它控制解码处理部分11而将该违反值置换成标准所规定的值。置换信息15是一为达到此目的而从控制部分12供向解码处理部分11的信息。这样,即使在比特流13中的解码用信息中存在标准违反值的情况下,也能对编码数据进行解码处理并输出解码数据16。
图2示出了输入到图1所示的多媒体数据解码装置10中的音频比特流的一个格式。一个音频帧由同步字、跟在该同步字后的解码用信息及接在该解码用信息后面的音频编码数据组成。解码处理部分11对解码用信息进行解析并抽出特定的任选项指定信息。这里所说的任选项指定信息,即为采样频率(sampling frequency)信息、强调(emphasis)信息、比特率索引(bit rate index)信息中之至少一个信息。例如,采样频率信息由指定可在DVD播放机的标准中取得的多个采样频率中之一的符号来表示。需提一下,有时同步字和解码用信息统称为帧头。
图3示出了输入到图1所示的多媒体数据解码装置10中的视频比特流的一个格式。一个GOP(Group of Pictures)由同步字、跟在该同步字后的解码用信息及跟在该解码用信息后的视频编码数据组成。解码处理部分11对解码用信息进行解析并抽出特定的任选项指定信息。这里所说的任选项指定信息,指表示一秒内能显示几幅图像的帧率码(frame ratecode)信息、指定4:2:0、4:2:2及4:4:4中之任一个的色度格式(chromaformat)信息、表示NTSC(National Television System Committee)/PAL(Phase Alteration Line)等视频方式的视频格式(video format)信息中之至少一个信息。帧率码信息、色度格式信息、视频格式信息都属于该视频比特流的序列层。
图4示出了图1所示的多媒体数据解码装置10的大致工作顺序。在步骤21下,由解码处理部分11对所输入的图2或者图3所示格式的比特流13中的同步字进行检索处理。若在步骤21检测到了同步字,解码处理部分11就进入步骤22下的解码用信息解析处理。在该解析处理中,解码处理部分11得到采样频率信息等任选项指定信息14。在步骤22进行完解码用信息解析处理后,进入步骤23下的判断部分。
在步骤23下,由控制部分12判断任选项指定信息14是否取了DVD播放机的标准所未规定的违反值,并决定下一个处理的分歧处。当在步骤23判断出没有标准违反值时,就进入由解码处理部分11进行的步骤25下的解码处理;而当存在标准违反值时,控制部分12就通过将置换信息15供给解码处理部分11而在步骤24对标准违反数据进行置换。此时,可使该装置为一将标准违反值置换为既定值的结构。具体而言,因多数情况下音乐CD(Compact Disk)中的数据都是被压缩到MP3格式,故在采样频率信息取了违反值的情况下,可将该违反值置换为既定值“44.1kHz”。就强调信息而言,因市场上所出现的光盘几乎都为“不强调”,故在强调信息取违反值的情况下,可将该违反值置换为既定值“不强调”。也可以使该装置为一将标准违反值置换为前一次解码处理中所用的值这样的结构。进行完步骤24下的置换处理后,进入步骤25下的解码处理。
在步骤25下,由解码处理部分11对编码数据进行解码处理。之后,在输出处理步骤26下由解码处理部分11输出解码数据16并回到步骤21下的同步字检索处理中。重复进行这些步骤21~26中的一系列处理,就能对编码数据进行解码处理。
图5示出了在图2中的比特率索引信息中存在标准违反值的情况下,图4中的置换处理24的一个详细顺序。首先,在步骤31下,进行下一个音频帧的同步字检索,并计数直到在步骤32下检索到同步字为止的编码数据的比特数。控制部分12,根据在步骤32下得到的计数值和解码用信息中的采样频率信息计算出比特率(步骤33),再进行将比特率索引信息中的违反值置换为已计算出的表示比特率的那一个值的处理(步骤34)。
如上所述,根据图1中的多媒体数据解码装置10,就是在所给出的比特流13中的解码用信息中存在标准违反值的情况下,也能防止出现声音断了、图像断了等现象。
需提一下,本发明并不仅限于对来自DVD等存储媒体的编码数据进行解码,也适用于对通信媒体、播放媒体等中的编码数据进行解码。
综上所述,根据本发明,在所抽出的任选项指定信息取了标准所未规定的违反值的情况下,将该违反值置换为由同一个标准规定的值并利用它进行解码处理了,故就是在解码用信息中存在标准违反值的情况下,也能对编码数据进行解码处理。
Claims (3)
1.一种多媒体数据解码装置,它按照所规定的标准对已编码的多媒体数据的比特流进行解码,其特征在于:
包括解码处理部分,它用于对所述比特流中的编码数据进行解码处理,且用于从所述比特流中检测出同步字,并对跟在该同步字后的解码用信息进行解析,而从中抽出特定的任选项指定信息;及
控制部分,它在所述任选项指定信息取了所述标准所未规定的违反值的情况下,控制所述解码处理部分而将该违反值置换为所述标准所规定的值后,再进行解码处理;
所述任选项指定信息,至少为音频比特流中的采样频率信息、强调信息、比特率索引信息中之一,或者
至少为视频比特流中的帧码信息、色度格式信息、视频格式信息中之一,
其中,当所述任选项指定信息为音频比特流中的比特率索引信息时,所述控制部分具有以下控制功能:根据所述解码用信息中的采样频率信息和到下一个同步字出现为止的所述编码数据的比特数算出比特率,再将所述违反值置换为表示所述已算出的比特率的值。
2.根据权利要求1所述的多媒体数据解码装置,其特征在于:
所述控制部分具有进行控制而将所述违反值置换为既定值的功能。
3.根据权利要求1所述的多媒体数据解码装置,其特征在于:
所述控制部分具有进行控制而将所述违反值置换为前一次解码处理中所用之值的功能。
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- 2002-11-07 EP EP02024976A patent/EP1353512A1/en not_active Withdrawn
- 2002-11-14 KR KR1020020070606A patent/KR100900607B1/ko active IP Right Grant
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2003
- 2003-01-06 US US10/336,800 patent/US7200562B2/en active Active
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Also Published As
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KR100900607B1 (ko) | 2009-06-02 |
US7200562B2 (en) | 2007-04-03 |
CN1450738A (zh) | 2003-10-22 |
KR20030080984A (ko) | 2003-10-17 |
US20030191630A1 (en) | 2003-10-09 |
EP1353512A1 (en) | 2003-10-15 |
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