CN102768834A - Method for decoding audio frequency frames - Google Patents

Method for decoding audio frequency frames Download PDF

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CN102768834A
CN102768834A CN2012100750297A CN201210075029A CN102768834A CN 102768834 A CN102768834 A CN 102768834A CN 2012100750297 A CN2012100750297 A CN 2012100750297A CN 201210075029 A CN201210075029 A CN 201210075029A CN 102768834 A CN102768834 A CN 102768834A
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audio
frame
value
mp3
frames
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CN102768834B (en
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夏永宏
谷洁平
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新奥特(北京)视频技术有限公司
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Abstract

The invention discloses a method for decoding audio frequency frames, which comprises the following steps: obtaining an mp3 (Moving Picture Experts Group-1 Layer 3) audio file; generating an audio index of the mp3 audio file, analyzing the mp3 audio file, and obtaining the value range of accumulative initial positions of each frame of audio master data as well as values of offset positions of each frame of audio master data; calculating the difference value between a initial value of the value range of the accumulative initial positions of each frame of audio master data and a value of the offset position of corresponding master data, taking the difference value as a dependence reference value, judging that the dependence relation exists or not based on that whether the dependence reference value of each frame is within the value range of the accumulative initial positions of other frames of audio master data; sequentially decoding all frames having the dependence relation with each frame, and obtaining audio sample data of each frame. Through the audio frame decoding method provided by the invention, the producing efficiency and quality are significantly improved.

Description

—种实现音频帧解码的方法 - implemented method of decoding audio frames

技术领域 FIELD

[0001] 本发明涉及音频解码领域,尤其涉及一种实现音频帧解码的方法。 [0001] The present invention relates to an audio decoder, and more particularly, to a method of decoding audio frames implemented.

背景技术 Background technique

[0002] MP3文件是由帧(frame)构成的,帧是MP3文件最小的组成单位。 [0002] MP3 files by frames (Frame) configuration, the frame is the smallest constituent unit of the MP3 file. MP3的全称应为MPEGlLayer-3 音频文件,MPEG (Moving Picture Experts Group)在汉语中译为动态图像专家组,特指动态影像专家压缩标准,MPEG音频文件是MPEGl标准中的声音部分,也叫MPEG音频层,它根据压缩质量和编码复杂程度划分为三层,即Layer-1、Layer2、Layer3,且分别对应MP1、MP2、MP3这三种声音文件,并根据不同的用途,使用不同层次的编码。 MP3 stands should be MPEGlLayer-3 audio files, MPEG (Moving Picture Experts Group) translated in Chinese, Moving Picture Experts Group, especially dynamic image compression standard expert, MPEG audio files are the sound part MPEGl standard, also known as MPEG audio layer, which is divided according to the quality of the compression and coding complexity of a three-layer, i.e., layer-1, Layer2, Layer3, and respectively MP1, MP2, MP3 audio files of these three, and depending on the use, the use of different levels of coding . MPEG音频编码的层次越高,编码器越复杂,压缩率也越高,MPl和MP2的压缩率分别为4 : I和6:1-8: 1,而MP3的压缩率则高达10 : 1-12 : 1,也就是说,一分钟⑶音质的音乐,未经压缩需要IOMB的存储空间,而经过MP3压缩编码后只有IMB左右。 The higher levels of MPEG audio coding, the more complex encoder, the higher the compression ratio, the compression ratio MPl and MP2, respectively 4: I and 6: 1-8: 1, and the MP3 compression ratio is as high as 10: 1 to 12: 1, that is to say, one minute ⑶ quality music, without the need to compress IOMB of storage space, and after MP3 compression coding only about IMB. 不过MP3对音频信号采用的是有损压缩方式,为了降低声音失真度,MP3采取了“感官编码技木”,即编码时先对音频文件进行频谱分析,然后用过滤器滤掉噪音电平,接着通过量化的方式将剩下的每ー位打散排列,最后形成具有较高压缩比的MP3文件,并使压缩后的文件在回放时能够达到比较接近原音源的声音效果。 But MP3 audio signal uses a lossy compression methods, in order to reduce sound distortion, MP3 adopted a "sensory coding technology of wood", the first audio file that is coded spectral analysis, and filter to filter out the noise level, followed by quantitative manner each of the remaining bits ー scattered arrangement, the final form of MP3 files having file higher compression ratio, and the compression can be achieved during playback of the original sound source is closer to.

[0003] 现有技术中对于音频是mp3编码格式的flv或mp4文件,都是直接根据时间标签获得音频巾贞Audio Frame,但是无法对当前时间点的数据进行正确的解码,对于是ー些直接从mp3同步头截断的音频文件,文件开头的几帧音频也是无法正确的解码。 [0003] For the prior art audio encoding format is mp3 or flv mp4 file, audio towels are obtained directly from time Chen Audio Frame label, but can not correctly decode the data of the current point in time, for a more direct ーcut off from the mp3 audio file synchronization header, starting with a few frames of the audio file is not correct decoding.

发明内容 SUMMARY

[0004] 本发明实施例提供一种实现音频帧解码的方法,极大地提高了制作的效率及质量。 [0004] Example embodiments provide a method for implementing the present invention, the decoded audio frames, greatly improves the production efficiency and quality.

[0005] 本发明实施例的技术方案是这样实现的: [0005] The technical solution of the embodiment of the present invention is implemented as follows:

[0006] 一种实现音频帧解码的方法,包括以下步骤: [0006] A method for implementing audio frame decoding, comprising the steps of:

[0007] 获取动态影像专家压缩标准音频第三层面mp3音频文件; [0007] obtain a dynamic image compression standard audio expert third level of mp3 audio files;

[0008] 生成所述mp3音频文件的音频索引,并解析所述mp3音频文件,获得每个帧音频主数据的累计起始位置的数值范围及每个帧音频主数据偏移位置的数值; [0008] generating the audio mp3 audio index file, and parses the mp3 audio file, to obtain the numerical ranges and values ​​accumulated for each starting position of the main frame of audio data each frame offset of audio main data;

[0009] 计算所述每个帧音频主数据的累计起始位置的数值范围的开始值与对应的主数据偏移位置的数值的差值作为依赖參照值,根据每个帧的依赖參照值是否在其他帧音频主数据的累计起始位置的数值范围内,判断是否有依赖关系; [0009] The main difference between the data value of the offset value corresponding to the start of the ranges of values ​​calculated for each main data accumulated audio frame start position as a reference value dependent on, for each frame in accordance with a reference value dependent on whether in the range of values ​​accumulated another frame start position of audio main data, determines whether there is a dependency;

[0010] 将与每一个帧有依赖关系的所有帧进行顺次解码,获得所述每ー个帧的音频采样数据。 [0010] will be sequentially decode all frames each have dependencies, each ー obtain the audio sample data frames.

[0011] 根据本发明实施例的技术方案,本发明的实施方式,通过判断各个帧之间的依赖关系,并通过依赖关系进行解码,从而可以正确对音频帧进行解码,极大的提高了制作效率及制作质量。 [0011] According to the embodiment of the present invention, embodiments of the present invention, and by determining dependencies between the various frames by decoding dependency, it can be correctly decoded audio frame, which greatly improves the production efficiency and production quality. 附图说明 BRIEF DESCRIPTION

[0012] 为了更清楚的说明本发明实施例的技术方案,下面将对实施例描述中所需要使用的附图作简单的介绍,显而易见的,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。 [0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings for describing the need to use a simple embodiment will be described, it is apparent, in the following description the drawings are merely some embodiments of the present invention. embodiment, those of ordinary skill in the art is concerned, without creative efforts, can derive from these drawings other drawings.

[0013] 图I为本发明实施例一所提供的一种实现音频帧解码的方法的流程图; [0013] Figure I of the present invention, a flowchart of a method provided according to an implementation of the embodiment of decoding audio frames;

[0014] 图2为本发明实施例二所提供的一种实现音频帧解码的方法的流程图。 [0014] FIG 2 is a flowchart of a method for implementing audio frame decoder according to the second embodiment of the present invention is provided.

具体实施方式 Detailed ways

[0015] 下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整的描述,显然所描述的实施例仅是本发明的一部分实施例,不是全部的实施例,基于本发明中的实施例,本领域普通技术人员在没有付出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。 [0015] below in conjunction with the present invention in the accompanying drawings, technical solutions of embodiments of the present invention will be clearly and fully described, obviously the described embodiments are merely part of embodiments of the present invention, not all of the embodiments , based on the embodiments of the present invention, all other embodiments to those of ordinary skill in the art without paying creative work at the obtained fall within the scope of the present invention.

[0016] 实施例一 [0016] Example a

[0017] 图I为本发明实施例所提供的一种实现音频转码的方法的流程图。 Flowchart of a method for implementing the audio transcoding according to an embodiment [0017] Figure I of the present invention. 如图I所示,该方法包括以下步骤: FIG I, the method comprising the steps of:

[0018] 步骤101、获取动态影像专家压缩标准音频第三层面mp3音频文件,所述mp3包括:mp3编码格式的flv或mp4文件,或从mp3同步头截断的音频文件。 [0018] Step 101, acquires an audio compression standard motion picture expert third level mp3 audio file, comprising the mp3: mp3 encoding format flv or mp4 file, or from a truncated mp3 audio file synchronization header.

[0019] 步骤102、生成所述mp3音频文件的音频索引,并解析所述mp3音频文件,获得每个帧音频主数据的累计起始位置的数值范围及每个帧音频主数据偏移位置的数值,相邻的两个帧中,前一帧的累计起始位置数值的数值范围的结束值等于后一帧的累计起始位置数值的数值范围的开始值。 [0019] Step 102, the generated audio index mp3 audio file, and parses the mp3 audio file, to obtain the accumulated value range start position of each frame of audio main data and audio main data for each frame offset position values, two adjacent frames, the value of the numerical range of the front end of an initial position value of the cumulative value equal to the starting value range after a cumulative value of the starting position.

[0020] 步骤103、计算所述每个帧音频主数据的累计起始位置的数值范围的开始值与对应的主数据偏移位置的数值的差值作为依赖参照值,根据每个帧的依赖参照值是否在其他帧音频主数据的累计起始位置的数值范围内,判断是否有依赖关系。 [0020] Step 103, a difference value is calculated start value of the numerical range of each frame of audio main data accumulated in the starting position corresponding to the main data as offset-dependent reference value, each dependent frame according a reference value is within a range of values ​​accumulated another frame start position of audio main data, determines whether there is a dependency. 具体的:当所述依赖参照值在其他帧音频主数据的累计起始位置的数值范围内时,则两者具有依赖关系;当所述依赖参照值不在其他帧音频主数据的累计起始位置的数值范围内时,则不与其他帧存在依赖关系。 Specifically: When the reference value is dependent on the range of values ​​accumulated another frame start position of audio main data, both having the dependency relationship; when the reference value is not dependent on the starting position of the accumulated additional frame of audio main data within the numerical range, with no dependencies other frames.

[0021] 步骤104、将与每一个帧有依赖关系的所有帧进行顺次解码,获得所述每一个帧的音频采样数据。 [0021] Step 104, will be sequentially decode each frame of all frames that depend on obtaining the samples of each frame of the audio data.

[0022] 本发明实施例实现了对音频帧进行正确的解码,极大的提高了制作效率及制作质量。 [0022] Example embodiments of the present invention to achieve a correct decoding of audio frames, greatly improves the production efficiency and production quality.

[0023] 实施例二 [0023] Second Embodiment

[0024] 图2为本发明实施例所提供的一种实现音频转码的方法的流程图。 [0024] FIG 2 is a flowchart of a method for implementing audio transcoding according to an embodiment of the present invention. 如图2所示,该方法包括以下步骤: 2, the method comprising the steps of:

[0025] 步骤201、获取动态影像专家压缩标准音频第三层面mp3音频文件,所述mp3包括:mp3编码格式的flv或mp4文件,或从mp3同步头截断的音频文件。 [0025] Step 201, the motion picture experts acquiring third level audio compression standard mp3 audio file, comprising the mp3: mp3 encoding format flv or mp4 file, or from a truncated mp3 audio file synchronization header.

[0026] 步骤202、生成所述mp3音频文件的音频索引,并解析所述mp3音频文件,获得每个帧音频主数据的累计起始位置的数值范围及每个帧音频主数据偏移位置的数值,相邻的两个帧中,前一帧的累计起始位置数值的数值范围的结束值等于后ー帧的累计起始位置数值的数值范围的开始值。 [0026] Step 202, the generated audio index mp3 audio file, and parses the mp3 audio file, to obtain the accumulated value range start position of each frame of audio main data and audio main data for each frame offset position values, two adjacent frames, the value of the numerical range of the front end of a cumulative value of the start position start value equal to the numerical range of the cumulative value after the starting position of the frame ー.

[0027] 步骤203、计算所述每个帧音频主数据的累计起始位置的数值范围的开始值与对应的主数据偏移位置的数值的差值作为依赖參照值,根据每个帧的依赖參照值是否在其他帧音频主数据的累计起始位置的数值范围内,判断是否有依赖关系。 [0027] Step 203, a difference value is calculated start value of the numerical range of each frame of audio main data accumulated in the starting position corresponding to the main data as offset-dependent reference value, each dependent frame according a reference value is within a range of values ​​accumulated another frame start position of audio main data, determines whether there is a dependency.

[0028] 步骤204、当所述依赖參照值在其他帧音频主数据的累计起始位置的数值范围内吋,则两者具有依赖关系,将与每一个帧有依赖关系的所有帧进行顺次解码,获得所述每ー个帧的音频采样数据。 [0028] Step 204, when the reference value is dependent on the range of values ​​in inches accumulated another frame start position of audio main data, both having the dependency relationship, and all frames will be sequentially each frame has dependencies decoding each ー obtain the audio sample data frames.

[0029] 步骤205、当所述依赖參照值不在其他帧音频主数据的累计起始位置的数值范围内时,则不与其他帧存在依赖关系,该帧可以单独进行解码,获得该帧的音频采样数据。 [0029] Step 205, when the reference value is dependent on another frame is not within the value range of audio main data accumulated in the starting position, with no dependencies other frame, the frame may be decoded separately to obtain the audio frame sampling data.

[0030] 本发明实施例实现了对音频帧进行正确的解码,极大的提高了制作效率及制作质量。 [0030] Example embodiments of the present invention to achieve a correct decoding of audio frames, greatly improves the production efficiency and production quality.

[0031] 通过以上的实施方式的描述,本领域的技术人员可以清楚地了解到本发明可以通过硬件实现,也可以借助软件加必要的通用硬件平台的方式来实现。 [0031] By the above described embodiments, those skilled in the art can understand that the present invention may be implemented by hardware, it may also be implemented by software plus a necessary universal hardware platform. 基于这样的理解,本发明的技术方案可以以软件产品的形式体现出来,该软件产品可以存储在一个非易失性存储介质(可以是⑶-ROM,U盘,移动硬盘等)中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)执行本发明各个实施例所述的方法。 Based on such understanding, the technical solutions of the present invention may be embodied in a software product out, the software product may be stored in a nonvolatile storage medium (which may be ⑶-ROM, U disk, mobile hard disk), and includes several instructions that enable a computer device (may be a personal computer, a server, or network device) to execute the methods according to embodiments of the present invention.

[0032] 总之,以上所述仅为本发明的较佳实施例而已,并非用于限定本发明的保护范围。 [0032] In summary, the above description is only preferred embodiments of the present invention but are not intended to limit the scope of the present invention. 凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。 Any modification within the spirit and principle of the present invention, made, equivalent substitutions, improvements, etc., should be included within the scope of the present invention.

Claims (4)

1. 一种实现音频帧解码的方法,其特征在于,包括以下步骤: 获取动态影像专家压缩标准音频第三层面mp3音频文件; 生成所述mp3音频文件的音频索引,并解析所述mp3音频文件,获得每个帧音频主数据的累计起始位置的数值范围及每个帧音频主数据偏移位置的数值; 计算所述每个帧音频主数据的累计起始位置的数值范围的开始值与对应的主数据偏移位置的数值的差值作为依赖参照值,根据每个帧的依赖参照值是否在其他帧音频主数据的累计起始位置的数值范围内,判断是否有依赖关系; 将与每一个帧有依赖关系的所有帧进行顺次解码,获得所述每一个帧的音频采样数据。 1. A method for audio decoding of the frame, characterized by comprising the steps of: obtaining an audio compression standard motion picture expert third level mp3 audio file; generating audio index the mp3 audio file, and parses the mp3 audio file numerical range of values ​​obtained for each frame of audio main data accumulated for each starting position and the main frame of audio data offset position; start value of the numerical range is calculated for each frame of audio main data accumulated in the starting position and difference values ​​corresponding to the main data as the offset position-dependent reference values, for each frame in accordance with a reference value dependent on whether the accumulated value range in another frame start position of audio main data, determines whether dependency; and the each frame has all dependencies frames are successively decoded, obtaining the audio sample of each frame of data.
2.如权利要求I所述一种音频帧解码的方法,其特征在于,所述判断是否有依赖关系包括: 当所述依赖参照值在其他帧音频主数据的累计起始位置的数值范围内时,则两者具有依赖关系; 当所述依赖参照值不在其他帧音频主数据的累计起始位置的数值范围内时,则不与其他帧存在依赖关系。 I 2. The method of decoding an audio frame as claimed in claim, wherein said determining whether there is a dependency comprising: when integrated within another frame start position of audio main data-dependent numerical range of the reference value , then both have a dependency relationship; when the dependent reference value is not within the value range the other main data accumulated audio frames starting position, with no other frame dependencies.
3.如权利要求2所述一种音频帧解码的方法,其特征在于,所述每个帧音频主数据的累计起始位置的数值范围包括: 相邻的两个帧中,前一帧的累计起始位置数值的数值范围的结束值等于后一帧的累计起始位置数值的数值范围的开始值。 2 3. The method of decoding an audio frame as claimed in claim, wherein said range of values ​​accumulated for each frame start position of audio main data comprising: two adjacent frames, the front frame end range of values ​​accumulated the starting position value equal to the starting value of the numerical range after an accumulated value of the starting position.
4.如权利要求I所述一种音频帧解码的方法,其特征在于,所述MP3音频文件包括:mp3编码格式的flv或mp4文件。 I 4. A method as claimed in claim decoded audio frames, characterized in that the MP3 audio file comprising: flv or mp3 encoded mp4 file format.
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