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This document uses the h264 video stream as an example to decode the stream data. To highlight this point, this article only focuses on decoding video stream data and does not involve anything else (such as the configuration of the development environment ). If you need this information, please contact me. Prepare Variables Define avcodeccontext. If you use a class, you can define it as a class member. It is defined as a global variable. Static avcodeccontext * g_pcodecctx = NULL; Defines an
encoding will appear garbled. We cannot identify the encoding method at all from the length and the encoding range. We can only identify the encoding mode by other methods. According to the above three points, we can make a hypothesis: If the UTF-8 decoding method is used to solve the gb2312 encoding, what will happen? Because the UTF-8 is composed of three groups of % XX, and gb2312 is composed of two groups of % XX, if the decoding method of UTF-8 to solve gb2312 and can be
the prediction error in the decoding.b frame relies on I frame, P frame, or other B frame data. I-frames represent keyframes, which you can understand as a complete reservation for this frame, and only need this frame of data to complete the decoding (because it contains the full picture). The P-frame represents the difference between this frame and a previous keyframe (or P-frame), which needs to be decoded to create the final picture by overlaying
opportunity to use, and later do OTT voice (app voice) used in the WEBRTC 3A algorithm. After doing the audio development on the Android mobile platform, I used the Neteq on the WEBRTC, but used the earlier C language version, not the C + + version, and only involved the DSP module in Neteq (Neteq has two modules, MCU (Micro control unit , Micro Control Unit) and DSP (digital signal processing, signal Processing unit), the MCU is responsible for controlling the insertion and extraction of voice
‘:‘A‘,‘c‘:3.0,‘b‘:(2,4)}] #python的dict类型的数据是没有顺序存储的JSON: [{"a":"A","c":3.0,"b":[2,4]}] The output of JSON is similar to data, except for some subtle changes such as Python's tuple type becoming an array of JSON, the code conversion rules for Python to JSON are:The Json.loads method handles decoding (decoding) conversions of simple data typesimport jsondata = [{‘a‘:"A",‘b‘:(2,4),‘c‘:3.0}] #list对象data_string = json.dumps(data)print "ENCODED:",data_stringdecoded = json.loads(data_string)print "
()) {intoutsize = out.size();//Last loop successfully decoded if(Outsize >0) {//Call the Channelread method behind the business handler Firechannelread(CTX, out, outsize);//Place size at 0Out.Clear();// if(CTX.isremoved()) { Break; } outsize =0; }//To get the number of readable bytes intOldinputlength = in.readablebytes();////Call the Decode method to place the successfully deco
setThere is also a concept for URI encoding and URI decoding, but URI encoding and decoding is not a conversion between a string and a byte stream, but rather a string representing another string, for example:The UTF-8 URI of "medium" is encoded as%e4%b8%adString%e4%b8%ad URI decoded to character "medium" according to UTF-8As can be seen, URI encoding is a string that is represented by a string of encoded%+ corresponding to the set of characters, the
FileInputStream is=new FileInputStream (); InputStreamReader reader=new InputStreamReader (is,charset);//Read file CharSet must be consistent or compatible when writing files, otherwise it will be garbled StringBuilder sb=new StringBuilder (); char[] buf = new char[64]; int count = 0; try{ while (count = Reader.read (buf)) { Sb.append (Buf,0,count); } }finally{ Reader.close (); } 2. Encoded operation in memory Conversion between a string and a byte array String str= "This is a Chinese charact
usually used for testing, so it is set to False when it is used normally. Invokes the Initialize method of the decoder object, passing in the correct sdecodingparam type parameter. decoding The true decoding needs to call the decoder object's Decodeframenodelay method, which requires 4 parameters, the first unsigned char pointer type parameter represents the address of the incoming NAL cell start, and the second int parameter represents the length of the nal cell. The third unsigned char pointe
s;} CERT_ECC_SIGNATURE, *PCERT_ECC_SIGNATURE; typedef struct _CRYPTOAPI_BLOB { DWORD cbData; __field_bcount(cbData) BYTE *pbData;} CRYPT_UINT_BLOB, *PCRYPT_UINT_BLOB; Call CryptDecodeObject for the first time to obtain the buffer length required for successful decoding, and complete decoding for the second time. If you can control the size of the cbData In the decoded r or s, so that it exceeds the Dst buffer s
] correctly, and then, in the program to achieve once decodeURIComponent (Java.net.URLDecoder (* *, "UTF-8") is usually used in Java to get the original value of the argument you want to commit.Give me a chestnut:String str1 = Urlencoder. encode ("Programmer", "utf-8");//Assume for the first time the browser is encodedString str2 = Urlencoder. encode (STR1, "utf-8"); Browser second-time encodingString deStr1 = Urldecoder. Decode (STR2, "GBK");The server is d
device. After the download is complete, the iniSound function is called, this function calls the decodeAudioData function in WebAudio to decode the downloaded data (currently stored as ArrayBuffer). If the platform does not support decoding audio files, an error callback function is called, if the decoding succeeds, a successful callback function is called. Now, if the decoding is successful, call the playSound function in the decoded function to pla
(diff) between the two adjacent DC coefficients as follows: Symbol A is (size ), symbol B is (amplitude ). Size indicates the number of digits required for amplitude encoding; Amplitude indicates the amplitude of the DC coefficient. In the JPEG standard, symbol A is encoded according to the corresponding Huffman table, and symbol B is converted into an integer, then, the vli code of symbol B is placed in the Huffman code of symbol A, and the diff encoding is completed. The default Huffman table
packet, the current package is spliced into the broken packet. boolean appended = false; // make sure that the buffer is auto-expanded. if (BUF. isautoexpand () {try {Buf. put (in); appended = true;} catch (illegalstateexception e) {// a user called derivation method (e.g. slice (), // which disables auto-expansion of the parent buffer .} catch (indexoutofboundsexception e) {// a user disabled auto-expansion .}} if (appended) {B Uf. flip ();} else {// reallocate the buffer if append operation f
sv = stage.stageVideos[0]; sv.addEventListener(StageVideoEvent.RENDER_STATE, stageVideoStateChange); } sv.attachNetStream(ns); } else { video.attachNetStream(ns); stage.addChildAt(video, 0); } ns.play(FILE_NAME); } You may have noticed that we have also listened toStageVideoEvent.RENDER_STATE. Please note thatVideoEvent.RENDER_STATEThis new event is also app
Sometimes YUV data needs to be extracted from FFMPEG for preview and stored. FFmpeg is decoded to YUV and then encoded as the input, There are two types of YUV data: Decoded YUV data and Encode and reconstruct the YUV data. Where are the two YUV data sources? And how to get it? 1. decoded YUV data In FFMPEG/libavcodec/utils_codec.c In the avcodec_decode_video2
In PHP Rawurlencode and Rawurlencode are the characters are encoded, the following I will introduce UrlEncode and rawurlencode the difference, there is a need to understand the friends can refer to. The purpose of UrlEncode is to encode a string, replacing all non-alphanumeric characters in the original string with all but "-_" as a percent sign (%) followed by a two-digit hexadecimal number, but note that the space is replaced by the + number for historical reasons. Rawurlencode in fact, like U
of the live video stream must be performed in real time and in sequence. Currently, P2P-based live video streaming uses application-layer multicast to send video streams.It is implemented by building a multicast tree. Each user (a node on the multicast tree) obtains the complete video stream from its parent node for viewing and forwards the video data to the downstream son node. In this wayThe network I/O bandwidth of each peer node in the multicast tree is high (it is not ideal for some user a
Document directory Libjpeg Introduction Use of libjpeg Library Summary Multimedia Applications are becoming more and more important in today's electronic products, especially in embedded devices. This series of articles will introduce how to use libjpeg to decode JPEG files, libpng to decode PNG files, and libgif to decode GIF files. This article describes how to use libjpeg to decode JPEG files.Libjpeg Introduction Libjpeg is a library fully written in C language. It includes the widely
Java Chinese garbled solution (8) ----- solve the URL Chinese garbled problem, javaurl We mainly send requests to the server in two forms: URL and form. Forms generally do not have garbled characters. garbled characters are mainly related to URLs. Through the introduction of the previous blogs, we know that the process of sending Request Encoding from URLs to servers is too messy. Different operating systems, different browsers, and different Web character sets will lead to completely different
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