{"id":32590,"date":"2025-04-24T20:17:58","date_gmt":"2025-04-24T12:17:58","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/32590.html"},"modified":"2025-04-24T20:17:58","modified_gmt":"2025-04-24T12:17:58","slug":"%e9%9f%b3%e8%a7%86%e9%a2%91%e5%ad%a6%e4%b9%a0-mp3%e6%a0%bc%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/32590.html","title":{"rendered":"\u97f3\u89c6\u9891\u5b66\u4e60 - MP3\u683c\u5f0f"},"content":{"rendered":"

\u73af\u5883<\/h3>\n

JDK 13 IDEA Build #IC-243.26053.27, built on March 16, 2025<\/p>\n

Demo<\/h3>\n

MP3Parser<\/p>\n

MP3<\/h3>\n

MP3\u5168\u79f0\u4e3aMPEG Audio Layer 3，\u5b83\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u8ba1\u7b97\u673a\u97f3\u9891\u7f16\u7801\u65b9\u6848，\u5b83\u4ee5\u8f83\u5927\u7684\u538b\u7f29\u6bd4\u5c06\u97f3\u9891\u6587\u4ef6\u8f6c\u6362\u6210\u8f83\u5c0f\u7684\u6269\u5c55\u540d\u4e3a.mp3\u7684\u6587\u4ef6，\u57fa\u672c\u4fdd\u6301\u6e90\u6587\u4ef6\u7684\u97f3\u8d28，MP3\u662fISO\/MPEG\u6807\u51c6\u7684\u4e00\u90e8\u5206，<\/p>\n

ISO\/MPEG\u6807\u51c6\u63cf\u8ff0\u4e86\u4f7f\u7528\u9ad8\u6027\u80fd\u611f\u77e5\u7f16\u7801\u65b9\u6848\u7684\u97f3\u9891\u538b\u7f29，\u6b64\u6807\u51c6\u4e00\u76f4\u5728\u4e0d\u65ad\u66f4\u65b0\u4ee5\u6ee1\u8db3\u201c\u8d28\u9ad8\u91cf\u5c0f\u201d\u7684\u8ffd\u6c42，\u73b0\u5df2\u5f62\u6210MPEG Layer1\u3001Layer2\u3001Layer3\u4e09\u79cd\u97f3\u9891\u7f16\u89e3\u7801\u65b9\u6848，\u5206\u522b\u5bf9\u5e94MP1\u3001MP2\u3001MP3 \u8fd9\u4e09\u79cd\u58f0\u97f3\u6587\u4ef6<\/p>\n

\u4e86\u89e3\u4e0bMP3\u7684\u7f16\u7801\u65b9\u5f0f<\/p>\n

\u9759\u6001\u7801\u7387(CBR):Constants Bits Rate\u662f\u4e00\u79cd\u56fa\u5b9a\u91c7\u6837\u7387\u7684\u538b\u7f29\u65b9\u5f0f \u8fd9\u79cd\u7f16\u7801\u65b9\u5f0f\u4e0d\u9700\u8981\u6587\u4ef6\u5934，\u7b2c\u4e00\u5e27\u5f00\u59cb\u5c31\u662f\u97f3\u9891\u6570\u636e<\/p>\n

（1）\u4f18\u70b9：\u538b\u7f29\u5feb，\u80fd\u88ab\u5927\u591a\u6570\u8f6f\u4ef6\u548c\u8bbe\u5907\u652f\u6301\u3002 （2）\u7f3a\u70b9：\u5360\u7528\u7a7a\u95f4\u5927，\u6548\u679c\u4e0d\u662f\u5341\u5206\u7406\u60f3\u3002\u73b0\u5df2\u9010\u6e10\u88abVBR\u65b9\u5f0f\u53d6\u4ee3\u3002<\/p>\n

\u52a8\u6001\u7801\u7387(VBR):Variable Bit Rate\u4f7f\u7528\u8fd9\u4e2a\u65b9\u5f0f\u65f6，\u53ef\u4ee5\u9009\u62e9\u4ece\u6700\u5dee\u97f3\u8d28\/\u6700\u5927\u538b\u7f29\u6bd4\u5230\u6700\u597d\u97f3\u8d28\/\u6700\u4f4e\u538b\u7f29\u6bd4\u4e4b\u95f4\u7684\u79cd\u79cd\u8fc7\u6e21\u7ea7\u6570，\u5728MP3\u6587\u4ef6\u7f16\u7801\u4e4b\u65f6，\u7a0b\u5e8f\u4f1a\u5c1d\u8bd5\u4fdd\u6301\u6240\u9009\u5b9a\u7684\u6574\u4e2a\u6587\u4ef6\u7684\u54c1\u8d28，\u5c06\u9009\u62e9\u9002\u5408\u97f3\u4e50\u6587\u4ef6\u4e0d\u540c\u90e8\u5206\u7684\u4e0d\u540c\u6bd4\u7279\u7387\u6765\u7f16\u7801\u3002<\/p>\n

\u9700\u8981\u6587\u4ef6\u5934<\/p>\n

（1）\u4f18\u70b9：\u53ef\u4ee5\u8ba9\u6574\u9996\u6b4c\u90fd\u80fd\u5927\u81f4\u8fbe\u5230\u6211\u4eec\u7684\u97f3\u8d28\u8981\u6c42\u3002 （2）\u7f3a\u70b9：\u7f16\u7801\u65f6\u65e0\u6cd5\u4f30\u8ba1\u538b\u7f29\u51fa\u6765\u7684\u6587\u4ef6\u4f53\u79ef\u5927\u5c0f<\/p>\n

\u6587\u4ef6\u7ed3\u6784<\/h4>\n

\u4e00\u822c\u53ef\u5206\u4e3a\u4ee5\u4e0b\u4e09\u90e8\u5206<\/p>\n

\u6765\u81ea\u53c2\u80033<\/p>\n

\"17452054380250.jpg\"<\/p>\n

\u914d\u5408\u5177\u4f53\u7684\u89e3\u6790\u7684\u5f00\u6e90\u5de5\u7a0b\u6765\u7406\u89e3<\/p>\n

mp3agic-Java\u5199\u7684\u8bfb\u5199mp3\u7684\u5f00\u6e90\u5e93<\/p>\n

\u56e0\u4e3a\u5de5\u7a0b\u662f\u4ee5\u524d\u7684,\u9047\u5230\u4e9b\u95ee\u9898,\u8d39\u4e86\u4e9b\u65f6\u95f4,\u7f16\u8bd1\u51famp3agic\u7684jar\u5305<\/p>\n

\"Snip20250421_1.png\"<\/p>\n

\u67e5\u770b\u8be5\u5de5\u5177\u52a0\u8f7dMP3\u6587\u4ef6\u4ee3\u7801，\u4ece\u4e2d\u4e5f\u53ef\u4ee5\u770b\u51fa,\u5206\u6210Id3v1,\u97f3\u9891,Id3v2\u548c\u81ea\u5b9a\u4e49\u7684\u90e8\u5206<\/p>\n

\/\/ Mp3File.java<\/span>
\nprivate<\/span> void<\/span> init<\/span>(<\/span>int<\/span> bufferLength,<\/span> boolean<\/span> scanFile)<\/span> throws<\/span> IOException<\/span>,<\/span> UnsupportedTagException<\/span>,<\/span> InvalidDataException<\/span> {<\/span>
\nif<\/span> (<\/span>bufferLength <<\/span> MINIMUM_BUFFER_LENGTH +<\/span> 1<\/span>)<\/span> throw<\/span> new<\/span> IllegalArgumentException<\/span>(<\/span>"Buffer too small"<\/span>)<\/span>;<\/span><\/p>\n

this<\/span>.<\/span>bufferLength =<\/span> bufferLength;<\/span>
\nthis<\/span>.<\/span>scanFile =<\/span> scanFile;<\/span><\/p>\n

try<\/span> (<\/span>SeekableByteChannel<\/span> seekableByteChannel =<\/span> Files<\/span>.<\/span>newByteChannel<\/span>(<\/span>path,<\/span> StandardOpenOption<\/span>.<\/span>READ)<\/span>)<\/span> {<\/span>
\n \/\/ \u52a0\u8f7dId3v1<\/span>
\ninitId3v1Tag<\/span>(<\/span>seekableByteChannel)<\/span>;<\/span><\/p>\n

\/\/ \u52a0\u8f7d\u97f3\u9891\u5e27\u90e8\u5206<\/span>
\nscanFile<\/span>(<\/span>seekableByteChannel)<\/span>;<\/span>
\nif<\/span> (<\/span>startOffset <<\/span> 0<\/span>)<\/span> {<\/span>
\nthrow<\/span> new<\/span> InvalidDataException<\/span>(<\/span>"No mpegs frames found"<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u52a0\u8f7dId3v2\u90e8\u5206<\/span>
\ninitId3v2Tag<\/span>(<\/span>seekableByteChannel)<\/span>;<\/span>
\nif<\/span> (<\/span>scanFile)<\/span> {<\/span>
\n \/\/ \u52a0\u8f7d\u81ea\u5b9a\u4e49\u90e8\u5206<\/span>
\ninitCustomTag<\/span>(<\/span>seekableByteChannel)<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

ID3V1<\/h5>\n

ID3 V1.0\u6807\u51c6\u5e76\u4e0d\u5468\u5168，\u5b58\u653e\u7684\u4fe1\u606f\u5c11，\u65e0\u6cd5\u5b58\u653e\u6b4c\u8bcd，\u65e0\u6cd5\u5f55\u5165\u4e13\u8f91\u5c01\u9762\u3001\u56fe\u7247\u7b49\u3002<\/p>\n

\u6b64\u6807\u51c6\u662f\u5c06MP3\u6587\u4ef6\u5c3e\u7684\u6700\u540e128\u4e2a\u5b57\u8282\u7528\u6765\u5b58\u653eID3\u4fe1\u606f<\/p>\n\n\u5b57\u8282\u957f\u5ea6(\u5b57\u8282)\u8bf4\u660e<\/tr>\n\n\n\n\n\n\n\n\n
1-3<\/td>\n3<\/td>\n\u5b58\u653e\u201dTAG\u201d\u5b57\u7b26,\u8868\u793aID3V1.0\u6807\u51c6,\u7d27\u63a5\u5176\u540e\u7684\u662f\u6b4c\u66f2\u4fe1\u606f<\/td>\n<\/tr>\n
4-33<\/td>\n30<\/td>\n\u6b4c\u540d<\/td>\n<\/tr>\n
34-63<\/td>\n30<\/td>\n\u4f5c\u8005<\/td>\n<\/tr>\n
64-93<\/td>\n30<\/td>\n\u4e13\u8f91\u540d<\/td>\n<\/tr>\n
94-97<\/td>\n4<\/td>\n\u5e74\u4efd<\/td>\n<\/tr>\n
98-127<\/td>\n30<\/td>\n\u9644\u6ce8<\/td>\n<\/tr>\n
128<\/td>\n1<\/td>\nMP3\u97f3\u4e50\u7c7b\u522b，\u5171147\u79cd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u97f3\u4e50\u7c7b\u578b\u5177\u4f53\u53ef\u4ee5\u770b ID3v1Geners.java\u4e2d\u5b9a\u4e49\u7684\u679a\u4e3e\u6216\u8005\u672c\u6587\u540e\u7684\u53c2\u80033<\/p>\n

0="Blues";
\n1="ClassicRock";
\n2="Country";
\n3="Dance";
\n4="Disco";
\n5="Funk";
\n6="Grunge";
\n7="Hip-Hop";
\n8="Jazz";
\n9="Metal";
\n10="NewAge";
\n11="Oldies";
\n12="Other";
\n13="Pop";
\n14="R&B";
\n15="Rap";
\n16="Reggae";
\n17="Rock";
\n18="Techno";
\n…
\n143="Salsa";
\n144="Trashl";
\n145="Anime";
\n146="JPop";
\n147="Synthpop";<\/p>\n

\u9a8c\u8bc1<\/h6>\n

\/\/ Main.java<\/span>
\npublic<\/span> class<\/span> Main<\/span> {<\/span>
\n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> InvalidDataException<\/span>,<\/span> UnsupportedTagException<\/span>,<\/span> IOException<\/span> {<\/span>
\n Main<\/span> parse =<\/span> new<\/span> Main<\/span>(<\/span>)<\/span>;<\/span>
\n String<\/span> filename =<\/span> "resource\/v24tagswithalbumimage.mp3"<\/span>;<\/span>
\n .<\/span>.<\/span>.<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

public<\/span> void<\/span> getID3v1Tag (<\/span>String<\/span> filename)<\/span> throws<\/span> InvalidDataException<\/span>,<\/span> UnsupportedTagException<\/span>,<\/span> IOException<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\\\\n========================MP3 ID3v1============================"<\/span>)<\/span>;<\/span>
\n Mp3File<\/span> mp3file =<\/span> new<\/span> Mp3File<\/span>(<\/span>filename)<\/span>;<\/span>
\n if<\/span> (<\/span>mp3file.<\/span>hasId3v1Tag<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n ID3v1<\/span> id3v1Tag =<\/span> mp3file.<\/span>getId3v1Tag<\/span>(<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Track: "<\/span> +<\/span> id3v1Tag.<\/span>getTrack<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Artist: "<\/span> +<\/span> id3v1Tag.<\/span>getArtist<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Title: "<\/span> +<\/span> id3v1Tag.<\/span>getTitle<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Album: "<\/span> +<\/span> id3v1Tag.<\/span>getAlbum<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Year: "<\/span> +<\/span> id3v1Tag.<\/span>getYear<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Genre: "<\/span> +<\/span> id3v1Tag.<\/span>getGenre<\/span>(<\/span>)<\/span> +<\/span> " ("<\/span> +<\/span> id3v1Tag.<\/span>getGenreDescription<\/span>(<\/span>)<\/span> +<\/span> ")"<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Comment: "<\/span> +<\/span> id3v1Tag.<\/span>getComment<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\"2025-04-22<\/p>\n

private<\/span> void<\/span> initId3v1Tag<\/span>(<\/span>SeekableByteChannel<\/span> var1)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n \/\/ \u521b\u5efa128\u4e2a\u5b57\u8282\u7684\u5927\u5c0f\u7f13\u51b2\u533a<\/span>
\n ByteBuffer<\/span> var2 =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>128<\/span>)<\/span>;<\/span>
\n \/\/ \u6587\u4ef6\u5bf9\u8c61\u6307\u5411\u5c3e\u90e8 – 128\u7684\u4f4d\u7f6e<\/span>
\n var1.<\/span>position<\/span>(<\/span>this<\/span>.<\/span>getLength<\/span>(<\/span>)<\/span> –<\/span> 128L<\/span>)<\/span>;<\/span>
\n var2.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/ \u8bfb\u53d6128\u4e2a\u5b57\u8282<\/span>
\n int<\/span> var3 =<\/span> var1.<\/span>read<\/span>(<\/span>var2)<\/span>;<\/span>
\n if<\/span> (<\/span>var3 <<\/span> 128<\/span>)<\/span> {<\/span>
\n throw<\/span> new<\/span> IOException<\/span>(<\/span>"Not enough bytes read"<\/span>)<\/span>;<\/span>
\n }<\/span> else<\/span> {<\/span>
\n try<\/span> {<\/span>
\n \/\/ \u521b\u5efaid3vTag\u5bf9\u8c61\u3002\u5c06128\u4e2a\u5b57\u8282\u4f20\u5165<\/span>
\n this<\/span>.<\/span>id3v1Tag =<\/span> new<\/span> ID3v1Tag<\/span>(<\/span>var2.<\/span>array<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span> catch<\/span> (<\/span>NoSuchTagException<\/span> var5)<\/span> {<\/span>
\n \/\/ \u4e0d\u662f\u4ee5TAG\u5f00\u5934\u629b\u51fa\u5f02\u5e38\u5728\u8fd9\u91cc\u6355\u83b7,\u662f\u5426\u6709Id3v1\u8fd9\u4e2a\u5c31\u662f\u5224\u65ad\u8be5\u5c5e\u6027<\/span>
\n \/\/ public boolean hasId3v1Tag() {<\/span>
\n \/\/ return this.id3v1Tag != null;<\/span>
\n \/\/ }<\/span>
\n this<\/span>.<\/span>id3v1Tag =<\/span> null<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

private<\/span> void<\/span> unpackTag<\/span>(<\/span>byte<\/span>[<\/span>]<\/span> var1)<\/span> throws<\/span> NoSuchTagException<\/span> {<\/span>
\n \/\/ \u662f\u5426\u4ee5TAG\u5f00\u5934<\/span>
\n this<\/span>.<\/span>sanityCheckTag<\/span>(<\/span>var1)<\/span>;<\/span>
\n \/\/ \u8fd9\u91cc\u5c31\u662f\u6839\u636e\u534f\u8bae\u8bfb\u53d6\u6307\u5b9a\u533a\u95f4,\u7136\u540e\u8f6c\u6210\u5bf9\u5e94\u7684\u5185\u5bb9<\/span>
\n this<\/span>.<\/span>title =<\/span> BufferTools<\/span>.<\/span>trimStringRight<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>var1,<\/span> 3<\/span>,<\/span> 30<\/span>)<\/span>)<\/span>;<\/span>
\n this<\/span>.<\/span>artist =<\/span> BufferTools<\/span>.<\/span>trimStringRight<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>var1,<\/span> 33<\/span>,<\/span> 30<\/span>)<\/span>)<\/span>;<\/span>
\n this<\/span>.<\/span>album =<\/span> BufferTools<\/span>.<\/span>trimStringRight<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>var1,<\/span> 63<\/span>,<\/span> 30<\/span>)<\/span>)<\/span>;<\/span>
\n this<\/span>.<\/span>year =<\/span> BufferTools<\/span>.<\/span>trimStringRight<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>var1,<\/span> 93<\/span>,<\/span> 4<\/span>)<\/span>)<\/span>;<\/span>
\n \/\/ \u97f3\u4e50\u7c7b\u578b<\/span>
\n this<\/span>.<\/span>genre =<\/span> var1[<\/span>127<\/span>]<\/span> &<\/span> 255<\/span>;<\/span>
\n if<\/span> (<\/span>this<\/span>.<\/span>genre ==<\/span> 255<\/span>)<\/span> {<\/span>
\n this<\/span>.<\/span>genre =<\/span> –<\/span>1<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ \u8bfb\u53d6\u9644\u6ce8<\/span>
\n if<\/span> (<\/span>var1[<\/span>125<\/span>]<\/span> !=<\/span> 0<\/span>)<\/span> {<\/span>
\n this<\/span>.<\/span>comment =<\/span> BufferTools<\/span>.<\/span>trimStringRight<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>var1,<\/span> 97<\/span>,<\/span> 30<\/span>)<\/span>)<\/span>;<\/span>
\n this<\/span>.<\/span>track =<\/span> null<\/span>;<\/span>
\n }<\/span> else<\/span> {<\/span>
\n this<\/span>.<\/span>comment =<\/span> BufferTools<\/span>.<\/span>trimStringRight<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>var1,<\/span> 97<\/span>,<\/span> 28<\/span>)<\/span>)<\/span>;<\/span>
\n byte<\/span> var2 =<\/span> var1[<\/span>126<\/span>]<\/span>;<\/span>
\n if<\/span> (<\/span>var2 ==<\/span> 0<\/span>)<\/span> {<\/span>
\n this<\/span>.<\/span>track =<\/span> ""<\/span>;<\/span>
\n }<\/span> else<\/span> {<\/span>
\n this<\/span>.<\/span>track =<\/span> Integer<\/span>.<\/span>toString<\/span>(<\/span>var2)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

}<\/span><\/p>\n

\/\/ \u6700\u540e\u8c03\u7528String,\u7136\u540e\u7f16\u7801\u683c\u5f0f\u662fISO-8859-1,\u5e94\u8be5\u4e0d\u652f\u6301\u4e2d\u6587<\/span>
\npublic<\/span> static<\/span> String<\/span> byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>byte<\/span>[<\/span>]<\/span> var0,<\/span> int<\/span> var1,<\/span> int<\/span> var2)<\/span> {<\/span>
\n try<\/span> {<\/span>
\n return<\/span> byteBufferToString<\/span>(<\/span>var0,<\/span> var1,<\/span> var2,<\/span> defaultCharsetName)<\/span>;<\/span>
\n }<\/span> catch<\/span> (<\/span>UnsupportedEncodingException<\/span> var4)<\/span> {<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u97f3\u9891\u5e27<\/h5>\n

\u6765\u81ea\u53c2\u80031<\/p>\n

\u6bcf\u4e2a\u5e27\u90fd\u6709\u4e00\u4e2a\u5e27\u5934，\u957f\u5ea6\u662f\u56db\u4e2a\u5b57\u8282，\u5e27\u540e\u9762\u53ef\u80fd\u67092\u5b57\u8282\u7684CRC\u6821\u9a8c，\u53d6\u51b3\u4e8e\u5e27\u5934\u7684\u7b2c16\u4f4d，\u4e3a0\u5219\u65e0\u6821\u9a8c，\u4e3a1\u5219\u6709\u6821\u9a8c，\u540e\u9762\u662f\u53ef\u53d8\u957f\u5ea6\u7684\u9644\u52a0\u4fe1\u606f，\u5bf9\u4e8e\u6807\u51c6\u7684MP3\u6587\u4ef6\u6765\u8bf4，\u5176\u957f\u5ea6\u662f32\u5b57\u8282，\u7d27\u63a5\u5176\u540e\u7684\u662f\u538b\u7f29\u7684\u58f0\u97f3\u6570\u636e，\u5f53\u89e3\u7801\u5668\u8bfb\u5230\u6b64\u5904\u65f6\u5c31\u8fdb\u884c\u89e3\u7801\u4e86\u3002<\/p>\n\n\u540d\u79f0\u957f\u5ea6(\u5b57\u8282)\u5c5e\u6027<\/tr>\n\n\n\n\n\n
\u5e27\u5934<\/td>\n4<\/td>\n\u5fc5\u5b58\u5728<\/td>\n<\/tr>\n
CRC<\/td>\n2<\/td>\n\u53ef\u80fd\u5b58\u5728<\/td>\n<\/tr>\n
Side Info<\/td>\n32<\/td>\n\u5fc5\u5b58\u5728<\/td>\n<\/tr>\n
\u58f0\u97f3\u6570\u636e<\/td>\nN<\/td>\n\u5fc5\u5b58\u5728<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

typedef<\/span> FrameHeader {<\/span>
\n unsigned<\/span> int<\/span> sync:<\/span>11<\/span>;<\/span> \/\/ \u540c\u6b65\u4fe1\u606f<\/span>
\n unsigned<\/span> int<\/span> version:<\/span>2<\/span>;<\/span> \/\/ \u7248\u672c<\/span>
\n unsigned<\/span> int<\/span> layer:<\/span> 2<\/span>;<\/span> \/\/ \u5c42<\/span>
\n unsigned<\/span> int<\/span> error protection:<\/span>1<\/span>;<\/span> \/\/ \u662f\u5426\u8981CRC\u6821\u9a8c<\/span>
\n unsigned<\/span> int<\/span> bitrate_index:<\/span>4<\/span>;<\/span> \/\/ \u4f4d\u7387<\/span>
\n unsigned<\/span> int<\/span> sampling_frequency:<\/span>2<\/span>;<\/span> \/\/ \u91c7\u6837\u9891\u7387<\/span>
\n unsigned<\/span> int<\/span> padding:<\/span>1<\/span>;<\/span> \/\/ \u5e27\u957f\u8c03\u8282<\/span>
\n unsigned<\/span> int<\/span> private:<\/span>1<\/span>;<\/span> \/\/ \u4fdd\u7559\u5b57<\/span>
\n unsigned<\/span> int<\/span> mode:<\/span>2<\/span>;<\/span> \/\/ \u58f0\u9053\u6a21\u5f0f<\/span>
\n unsigned<\/span> int<\/span> mode extension:<\/span>2<\/span>;<\/span> \/\/ \u6269\u5145\u6a21\u5f0f<\/span>
\n unsigned<\/span> int<\/span> copyright:<\/span>1<\/span>;<\/span> \/\/ \u7248\u6743<\/span>
\n unsigned<\/span> int<\/span> original:<\/span>1<\/span>;<\/span> \/\/ \u539f\u7248\u6807\u5fd7<\/span>
\n unsigned<\/span> int<\/span> emphasis:<\/span>2<\/span>;<\/span> \/\/ \u5f3a\u8c03\u6a21\u5f0f<\/span>
\n}<\/span>HEADER,<\/span> *<\/span>LPHEADER;<\/span><\/p>\n\n\u540d\u79f0\u4f4d\u957f\u7b2c\u51e0\u5b57\u8282\u8bf4\u660e<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u540c\u6b65\u4fe1\u606f<\/td>\n11<\/td>\n1~2<\/td>\n\u6240\u6709\u4f4d\u5747\u4e3a1，\u7b2c1\u5b57\u8282\u6052\u4e3aFF<\/td>\n<\/tr>\n
\u7248\u672c<\/td>\n2<\/td>\n2<\/td>\n00-MPEG 2.5 01-\u672a\u5b9a\u4e49 10-MPEG2 11-MPEG 1<\/td>\n<\/tr>\n
\u5c42<\/td>\n2<\/td>\n2<\/td>\n00-\u672a\u5b9a\u4e49 01-Layer 3 10-Layer 2 11-Layer 1<\/td>\n<\/tr>\n
CRC\u6821\u9a8c<\/td>\n1<\/td>\n2<\/td>\n0-\u6821\u9a8c 1-\u4e0d\u6821\u9a8c<\/td>\n<\/tr>\n
\u4f4d\u7387<\/td>\n4<\/td>\n3<\/td>\n\u53d6\u6837\u7387,\u5355\u4f4d\u4e3akbs\u3002\u8be6\u89c1\u4e0b\u8868<\/td>\n<\/tr>\n
\u91c7\u6837\u9891\u7387<\/td>\n2<\/td>\n3<\/td>\nMPEG-1: 00:44.1kHz 01:48kHz 10:32kHz 11-\u672a\u5b9a\u4e49<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\nMPEG-2: 00:22.05kHz 01:24kHz 10:16kHz 11-\u672a\u5b9a\u4e49<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\nMPEG-2.5: 00:11.025kHz 01:12kHz 10:8kHz 11-\u672a\u5b9a\u4e49<\/td>\n<\/tr>\n
\u5e27\u957f\u8c03\u8282<\/td>\n1<\/td>\n3<\/td>\n\u7528\u4e8e\u8c03\u6574\u6587\u4ef6\u5934\u957f\u5ea6，0:\u65e0\u9700\u8c03\u6574 1:\u8c03\u6574<\/td>\n<\/tr>\n
\u4fdd\u7559\u5b57<\/td>\n1<\/td>\n3<\/td>\n\u6ca1\u6709\u4f7f\u7528<\/td>\n<\/tr>\n
\u58f0\u9053\u6a21\u5f0f<\/td>\n2<\/td>\n4<\/td>\n00:\u7acb\u4f53\u58f0Stereo 01:Joint Stereo 10:\u53cc\u58f0\u9053 11:\u5355\u58f0\u9053<\/td>\n<\/tr>\n
\u6269\u5145\u6a21\u5f0f<\/td>\n2<\/td>\n4<\/td>\n\u5f53\u58f0\u9053\u6a21\u5f0f\u4e3a01\u65f6\u624d\u4f7f\u7528<\/td>\n<\/tr>\n
\u7248\u6743<\/td>\n1<\/td>\n4<\/td>\n0:\u4e0d\u5408\u6cd5 1:\u5408\u6cd5<\/td>\n<\/tr>\n
\u539f\u7248\u6807\u5fd7<\/td>\n1<\/td>\n4<\/td>\n\u662f\u5426\u539f\u7248, 0: \u975e\u539f\u7248，1:\u539f\u7248<\/td>\n<\/tr>\n
\u5f3a\u8c03\u65b9\u5f0f<\/td>\n2<\/td>\n4<\/td>\n\u7528\u4e8e\u58f0\u97f3\u964d\u566a\u538b\u7f29\u540e\u518d\u8865\u507f\u7684\u5206\u7c7b,\u5f88\u5c11\u7528\u5230<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4f4d\u7387<\/p>\n

V1: MPEG 1 V2: MPEG 2 \u548c MPEG 2.5<\/p>\n

L1: Layer 1 L2: Lyaer 2 L3: Layer 3<\/p>\n\nbitsV1,L1V1,L2V1,L3V2,L1V2,L2V2,L3<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
0000<\/td>\nfree<\/td>\nfree<\/td>\nfree<\/td>\nfree<\/td>\nfree<\/td>\nfree<\/td>\n<\/tr>\n
0001<\/td>\n32<\/td>\n32<\/td>\n32<\/td>\n32(32)<\/td>\n32(8)<\/td>\n8(8)<\/td>\n<\/tr>\n
0010<\/td>\n64<\/td>\n48<\/td>\n40<\/td>\n64(48)<\/td>\n48(16)<\/td>\n16(16)<\/td>\n<\/tr>\n
0011<\/td>\n96<\/td>\n56<\/td>\n48<\/td>\n96(56)<\/td>\n56(24)<\/td>\n24(24)<\/td>\n<\/tr>\n
0100<\/td>\n128<\/td>\n64<\/td>\n56<\/td>\n128(64)<\/td>\n64(32)<\/td>\n32(32)<\/td>\n<\/tr>\n
0101<\/td>\n160<\/td>\n80<\/td>\n64<\/td>\n160(80)<\/td>\n80(40)<\/td>\n64(40)<\/td>\n<\/tr>\n
0110<\/td>\n192<\/td>\n96<\/td>\n80<\/td>\n192(96)<\/td>\n96(48)<\/td>\n80(48)<\/td>\n<\/tr>\n
0111<\/td>\n224<\/td>\n112<\/td>\n96<\/td>\n224(112)<\/td>\n112(56)<\/td>\n56(56)<\/td>\n<\/tr>\n
1000<\/td>\n256<\/td>\n128<\/td>\n112<\/td>\n256(128)<\/td>\n128(64)<\/td>\n64(64)<\/td>\n<\/tr>\n
1001<\/td>\n288<\/td>\n160<\/td>\n128<\/td>\n288(144)<\/td>\n160(80)<\/td>\n128(80)<\/td>\n<\/tr>\n
1010<\/td>\n320<\/td>\n192<\/td>\n160<\/td>\n320(160)<\/td>\n192(96)<\/td>\n160(96)<\/td>\n<\/tr>\n
1011<\/td>\n352<\/td>\n224<\/td>\n192<\/td>\n356(176)<\/td>\n224(112)<\/td>\n112(112)<\/td>\n<\/tr>\n
1100<\/td>\n384<\/td>\n256<\/td>\n224<\/td>\n384(192)<\/td>\n256(128)<\/td>\n128(128)<\/td>\n<\/tr>\n
1101<\/td>\n416<\/td>\n320<\/td>\n256<\/td>\n416(224)<\/td>\n320(144)<\/td>\n256(144)<\/td>\n<\/tr>\n
1110<\/td>\n448<\/td>\n384<\/td>\n320<\/td>\n448(256)<\/td>\n384(160)<\/td>\n320(160)<\/td>\n<\/tr>\n
1111<\/td>\nbad<\/td>\nbad<\/td>\nbad<\/td>\nbad<\/td>\nbad<\/td>\nbad<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5e27\u5927\u5c0f\u5373\u6bcf\u5e27\u7684\u91c7\u6837\u6570，\u8868\u793a\u4e00\u5e27\u6570\u636e\u4e2d\u91c7\u6837\u7684\u4e2a\u6570，\u8be5\u503c\u662f\u6052\u5b9a\u7684<\/p>\n

MP3\u7684\u5e27\u5927\u5c0f\u662f1152<\/p>\n

\u5e27\u957f\u5ea6\u662f\u538b\u7f29\u65f6\u6bcf\u4e00\u5e27\u7684\u957f\u5ea6，\u5305\u62ec\u5e27\u5934\u76844\u4e2a\u5b57\u8282\u3002\u5b83\u5c06\u586b\u5145\u7684\u7a7a\u4f4d\u4e5f\u8ba1\u7b97\u5728\u5185\u3002Layer 2\u548cLayer 3\u7684\u7a7a\u4f4d\u662f1\u5b57\u8282\u3002\u5f53\u8bfb\u53d6MPEG\u6587\u4ef6\u65f6\u5fc5\u987b\u8ba1\u7b97\u8be5\u503c\u4ee5\u4fbf\u627e\u5230\u76f8\u90bb\u7684\u5e27<\/p>\n

\u8ba1\u7b97\u516c\u5f0f:<\/p>\n

Layer2\/3：Len(\u5b57\u8282) = ((\u6bcf\u5e27\u91c7\u6837\u6570\/8*\u6bd4\u7279\u7387)\/\u91c7\u6837\u9891\u7387)+\u586b\u5145<\/p>\n

\u4f8b：MPEG1 Layer3 \u6bd4\u7279\u7387128000，\u91c7\u6837\u738744100，\u586b\u51450，\u5e27\u957f\u5ea6\u4e3a：((1152\/8*128K)\/44.1K+0=417\u5b57\u8282<\/p>\n

\u5e27\u6301\u7eed\u65f6\u95f4<\/p>\n

\u8ba1\u7b97\u516c\u5f0f:<\/p>\n

\u6bcf\u5e27\u6301\u7eed\u65f6\u95f4(\u6beb\u79d2) = \u6bcf\u5e27\u91c7\u6837\u6570 \/ \u91c7\u6837\u9891\u7387 * 1000<\/p>\n

\u4f8b：1152\/441000*1000=26ms<\/p>\n

\u5e27\u5934\u540e\u8fb9\u662fSide Info\u3002\u5bf9\u6807\u51c6\u7684\u7acb\u4f53\u58f0MP3\u6587\u4ef6\u6765\u8bf4\u5176\u957f\u5ea6\u4e3a32\u5b57\u8282\u3002\u5f53\u89e3\u7801\u5668\u5728\u8bfb\u5230\u4e0a\u8ff0\u4fe1\u606f\u540e，\u5c31\u53ef\u4ee5\u8fdb\u884c\u89e3\u7801\u4e86<\/p>\n

\u9a8c\u8bc1<\/h6>\n

\u8bfb\u53d6\u97f3\u9891\u6570\u636e\u5e27\u5934<\/p>\n

\/\/ Mp3File.java<\/span>
\n\/\/ \u521d\u59cb\u5316\u65b9\u6cd5<\/span>
\n.<\/span>.<\/span>.<\/span>
\n\/\/ \u4f20MP3\u6587\u4ef6<\/span>
\nscanFile<\/span>(<\/span>seekableByteChannel)<\/span>;<\/span>
\n.<\/span>.<\/span>.<\/span><\/p>\n

\/\/ Mp3File.java<\/span>
\nprivate<\/span> void<\/span> scanFile<\/span>(<\/span>SeekableByteChannel<\/span> seekableByteChannel)<\/span> throws<\/span> IOException<\/span>,<\/span> InvalidDataException<\/span> {<\/span>
\n \/\/ \u8bfb\u53d6MP3\u6587\u4ef6\u7684\u7f13\u51b2\u533a<\/span>
\nByteBuffer<\/span> byteBuffer =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>bufferLength)<\/span>;<\/span>
\n\/\/ <1>\u83b7\u53d6\u97f3\u9891\u5e27\u7684\u8d77\u59cb\u4f4d\u7f6e<\/span>
\nint<\/span> fileOffset =<\/span> preScanFile<\/span>(<\/span>seekableByteChannel)<\/span>;<\/span>
\nseekableByteChannel.<\/span>position<\/span>(<\/span>fileOffset)<\/span>;<\/span>
\nboolean<\/span> lastBlock =<\/span> false<\/span>;<\/span>
\nint<\/span> lastOffset =<\/span> fileOffset;<\/span>
\nwhile<\/span> (<\/span>!<\/span>lastBlock)<\/span> {<\/span>
\nbyteBuffer.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span>
\nint<\/span> bytesRead =<\/span> seekableByteChannel.<\/span>read<\/span>(<\/span>byteBuffer)<\/span>;<\/span>
\nbyte<\/span>[<\/span>]<\/span> bytes =<\/span> byteBuffer.<\/span>array<\/span>(<\/span>)<\/span>;<\/span>
\n\/\/ \u6700\u540e\u4e00\u5e27\u5b57\u8282\u957f\u5ea6\u5c0f\u4e8e\u7f13\u51b2\u533a\u957f\u5ea6<\/span>
\nif<\/span> (<\/span>bytesRead <<\/span> bufferLength)<\/span> lastBlock =<\/span> true<\/span>;<\/span>
\nif<\/span> (<\/span>bytesRead >=<\/span> MINIMUM_BUFFER_LENGTH)<\/span> {<\/span>
\nwhile<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
\ntry<\/span> {<\/span>
\nint<\/span> offset =<\/span> 0<\/span>;<\/span>
\n\/\/ <2>\u97f3\u9891\u9996\u5e27\u7684\u5904\u7406<\/span>
\nif<\/span> (<\/span>startOffset <<\/span> 0<\/span>)<\/span> {<\/span>
\noffset =<\/span> scanBlockForStart<\/span>(<\/span>bytes,<\/span> bytesRead,<\/span> fileOffset,<\/span> offset)<\/span>;<\/span>
\nif<\/span> (<\/span>startOffset >=<\/span> 0<\/span> &&<\/span> !<\/span>scanFile)<\/span> {<\/span>
\nreturn<\/span>;<\/span>
\n}<\/span>
\nlastOffset =<\/span> startOffset;<\/span>
\n}<\/span>
\n\/\/ <3>\u8bfb\u53d6\u97f3\u9891\u5e27<\/span>
\noffset =<\/span> scanBlock<\/span>(<\/span>bytes,<\/span> bytesRead,<\/span> fileOffset,<\/span> offset)<\/span>;<\/span>
\n\/\/ \u6587\u4ef6\u504f\u79fb\u91cf<\/span>
\nfileOffset +=<\/span> offset;<\/span>
\n\/\/ \u66f4\u65b0\u6587\u4ef6\u7684\u504f\u79fb\u91cf<\/span>
\nseekableByteChannel.<\/span>position<\/span>(<\/span>fileOffset)<\/span>;<\/span>
\nbreak<\/span>;<\/span>
\n}<\/span> catch<\/span> (<\/span>InvalidDataException<\/span> e)<\/span> {<\/span>
\nif<\/span> (<\/span>frameCount <<\/span> 2<\/span>)<\/span> {<\/span>
\nstartOffset =<\/span> –<\/span>1<\/span>;<\/span>
\nxingOffset =<\/span> –<\/span>1<\/span>;<\/span>
\nframeCount =<\/span> 0<\/span>;<\/span>
\nbitrates.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span>
\nlastBlock =<\/span> false<\/span>;<\/span>
\nfileOffset =<\/span> lastOffset +<\/span> 1<\/span>;<\/span>
\nif<\/span> (<\/span>fileOffset ==<\/span> 0<\/span>)<\/span>
\nthrow<\/span> new<\/span> InvalidDataException<\/span>(<\/span>"Valid start of mpeg frames not found"<\/span>,<\/span> e)<\/span>;<\/span>
\nseekableByteChannel.<\/span>position<\/span>(<\/span>fileOffset)<\/span>;<\/span>
\nbreak<\/span>;<\/span>
\n}<\/span>
\nreturn<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\n}<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

<1> \u83b7\u53d6\u6587\u4ef6\u504f\u79fb\u91cf<\/p>\n

protected<\/span> int<\/span> preScanFile<\/span>(<\/span>SeekableByteChannel<\/span> seekableByteChannel)<\/span> {<\/span>
\nByteBuffer<\/span> byteBuffer =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>AbstractID3v2Tag<\/span>.<\/span>HEADER_LENGTH)<\/span>;<\/span>
\ntry<\/span> {<\/span>
\nseekableByteChannel.<\/span>position<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
\nbyteBuffer.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span>
\nint<\/span> bytesRead =<\/span> seekableByteChannel.<\/span>read<\/span>(<\/span>byteBuffer)<\/span>;<\/span>
\n\/\/ ID3v2\u7684\u8868\u5934 10\u4e2a\u5b57\u8282<\/span>
\nif<\/span> (<\/span>bytesRead ==<\/span> AbstractID3v2Tag<\/span>.<\/span>HEADER_LENGTH)<\/span> {<\/span>
\ntry<\/span> {<\/span>
\nbyte<\/span>[<\/span>]<\/span> bytes =<\/span> byteBuffer.<\/span>array<\/span>(<\/span>)<\/span>;<\/span>
\nID3v2TagFactory<\/span>.<\/span>sanityCheckTag<\/span>(<\/span>bytes)<\/span>;<\/span>
\n\/\/ \u97f3\u9891\u5e27\u7684\u8d77\u59cb\u4f4d\u7f6e\u662f\u901a\u8fc7\u8868\u5934\u768410\u4e2a\u5b57\u8282 + f(\u8868\u5934\u6700\u540e\u76844\u4e2a\u5b57\u8282)\u8ba1\u7b97\u51fa\u6765,\u540e\u9762\u53ef\u77e5\u5c31\u662fID3v2\u7684\u7ed3\u6784\u4f53\u7684size<\/span>
\nreturn<\/span> AbstractID3v2Tag<\/span>.<\/span>HEADER_LENGTH +<\/span> BufferTools<\/span>.<\/span>unpackSynchsafeInteger<\/span>(<\/span>bytes[<\/span>AbstractID3v2Tag<\/span>.<\/span>DATA_LENGTH_OFFSET]<\/span>,<\/span> bytes[<\/span>AbstractID3v2Tag<\/span>.<\/span>DATA_LENGTH_OFFSET +<\/span> 1<\/span>]<\/span>,<\/span> bytes[<\/span>AbstractID3v2Tag<\/span>.<\/span>DATA_LENGTH_OFFSET +<\/span> 2<\/span>]<\/span>,<\/span> bytes[<\/span>AbstractID3v2Tag<\/span>.<\/span>DATA_LENGTH_OFFSET +<\/span> 3<\/span>]<\/span>)<\/span>;<\/span>
\n}<\/span> catch<\/span> (<\/span>NoSuchTagException<\/span> |<\/span> UnsupportedTagException<\/span> e)<\/span> {<\/span>
\n\/\/ do nothing<\/span>
\n}<\/span>
\n}<\/span>
\n}<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>
\n\/\/ do nothing<\/span>
\n}<\/span>
\nreturn<\/span> 0<\/span>;<\/span>
\n}<\/span><\/p>\n

\u89c4\u5219\u4ee3\u7801\u5982\u4e0b<\/p>\n

public<\/span> static<\/span> int<\/span> shiftByte<\/span>(<\/span>byte<\/span> c,<\/span> int<\/span> places)<\/span> {<\/span>
\n \/\/ c \u4f4d\u4e0e 0xff \u90a3\u8fd8\u662f\u539f\u6765\u7684\u5b57\u8282，\u53ea\u4fdd\u7559\u4f4e8\u4f4d<\/span>
\nint<\/span> i =<\/span> c &<\/span> 0xff<\/span>;<\/span>
\n\/\/ < 0 ，i\u5411\u5de6\u4f4d\u79fb<\/span>
\n\/\/ > 0 , i\u5411\u53f3\u4f4d\u79fb，\u867d\u7136\u8fd9\u91cc\u4f20\u7684\u90fd\u662f<0，\u8003\u8651\u5927\u7aef\u7684\u573a\u666f\u5e94\u8be5\u662f\u517c\u5bb9<\/span>
\nif<\/span> (<\/span>places <<\/span> 0<\/span>)<\/span> {<\/span>
\nreturn<\/span> i <<<\/span> –<\/span>places;<\/span>
\n}<\/span> else<\/span> if<\/span> (<\/span>places ><\/span> 0<\/span>)<\/span> {<\/span>
\nreturn<\/span> i >><\/span> places;<\/span>
\n}<\/span>
\nreturn<\/span> i;<\/span>
\n}<\/span><\/p>\n

public<\/span> static<\/span> int<\/span> unpackSynchsafeInteger<\/span>(<\/span>byte<\/span> b1,<\/span> byte<\/span> b2,<\/span> byte<\/span> b3,<\/span> byte<\/span> b4)<\/span> {<\/span>
\n \/\/ b4\u662fsize\u7684\u6700\u4f4e\u4f4d => size[3]<\/span>
\n \/\/ b3\u662fsize[2]<\/span>
\n \/\/ …<\/span>
\n \/\/ & 0x7f\u5c31\u662f\u53ea\u4fdd\u7559\u8be5\u4f4d,\u7136\u540e\u901a\u8fc7\u4f4d\u79fb\u5f97\u5230\u8be5\u4f4d\u7684\u503c,\u7136\u540e\u76f8\u52a0\u8ba1\u7b97\u51faID3v2\u7684\u603b\u957f\u5ea6<\/span>
\nint<\/span> value =<\/span> (<\/span>(<\/span>byte<\/span>)<\/span> (<\/span>b4 &<\/span> 0x7f<\/span>)<\/span>)<\/span>;<\/span>
\nvalue +=<\/span> shiftByte<\/span>(<\/span>(<\/span>byte<\/span>)<\/span> (<\/span>b3 &<\/span> 0x7f<\/span>)<\/span>,<\/span> –<\/span>7<\/span>)<\/span>;<\/span>
\nvalue +=<\/span> shiftByte<\/span>(<\/span>(<\/span>byte<\/span>)<\/span> (<\/span>b2 &<\/span> 0x7f<\/span>)<\/span>,<\/span> –<\/span>14<\/span>)<\/span>;<\/span>
\nvalue +=<\/span> shiftByte<\/span>(<\/span>(<\/span>byte<\/span>)<\/span> (<\/span>b1 &<\/span> 0x7f<\/span>)<\/span>,<\/span> –<\/span>21<\/span>)<\/span>;<\/span>
\nreturn<\/span> value;<\/span>
\n}<\/span><\/p>\n

<2>\u97f3\u9891\u9996\u5e27\u7684\u5904\u7406<\/p>\n

private<\/span> int<\/span> scanBlockForStart<\/span>(<\/span>byte<\/span>[<\/span>]<\/span> bytes,<\/span> int<\/span> bytesRead,<\/span> int<\/span> absoluteOffset,<\/span> int<\/span> offset)<\/span> {<\/span>
\nwhile<\/span> (<\/span>offset <<\/span> bytesRead –<\/span> MINIMUM_BUFFER_LENGTH)<\/span> {<\/span>
\n \/\/ \u97f3\u9891\u5e27\u5934\u540c\u6b65: 11\u4f4d\u90fd\u8981\u662f1 = 0b1111 1111 1110 000\u3002\u4f4e\u4f4d\u4e0eE0\u8981\u7b49\u4e8eE0<\/span>
\nif<\/span> (<\/span>bytes[<\/span>offset]<\/span> ==<\/span> (<\/span>byte<\/span>)<\/span> 0xFF<\/span> &&<\/span> (<\/span>bytes[<\/span>offset +<\/span> 1<\/span>]<\/span> &<\/span> (<\/span>byte<\/span>)<\/span> 0xE0<\/span>)<\/span> ==<\/span> (<\/span>byte<\/span>)<\/span> 0xE0<\/span>)<\/span> {<\/span>
\ntry<\/span> {<\/span>
\n \/\/ \u521d\u59cb\u5316\u97f3\u9891\u5e27，\u5e27\u5934\u67094\u4e2a\u5b57\u8282<\/span>
\nMpegFrame<\/span> frame =<\/span> new<\/span> MpegFrame<\/span>(<\/span>bytes[<\/span>offset]<\/span>,<\/span> bytes[<\/span>offset +<\/span> 1<\/span>]<\/span>,<\/span> bytes[<\/span>offset +<\/span> 2<\/span>]<\/span>,<\/span> bytes[<\/span>offset +<\/span> 3<\/span>]<\/span>)<\/span>;<\/span>
\n\/\/ \u56e0\u4e3aVBR\u662fXing\u516c\u53f8\u53d1\u660e\u7684,\u6240\u4ee5\u97f3\u9891\u9996\u5e27\u91cc\u4f1a\u7559"\u75d5\u8ff9"，\u4f4d\u4e8eMP3\u6587\u4ef6\u4e2d\u7b2c\u4e00\u4e2a\u6709\u6548\u5e27\u7684\u6570\u636e\u533a<\/span>
\nif<\/span> (<\/span>xingOffset <<\/span> 0<\/span> &&<\/span> isXingFrame<\/span>(<\/span>bytes,<\/span> offset)<\/span>)<\/span> {<\/span>
\nxingOffset =<\/span> absoluteOffset +<\/span> offset;<\/span>
\nxingBitrate =<\/span> frame.<\/span>getBitrate<\/span>(<\/span>)<\/span>;<\/span>
\noffset +=<\/span> frame.<\/span>getLengthInBytes<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span> else<\/span> {<\/span>
\n \/\/ \u975eVBR<\/span>
\nstartOffset =<\/span> absoluteOffset +<\/span> offset;<\/span>
\nchannelMode =<\/span> frame.<\/span>getChannelMode<\/span>(<\/span>)<\/span>;<\/span>
\nemphasis =<\/span> frame.<\/span>getEmphasis<\/span>(<\/span>)<\/span>;<\/span>
\nlayer =<\/span> frame.<\/span>getLayer<\/span>(<\/span>)<\/span>;<\/span>
\nmodeExtension =<\/span> frame.<\/span>getModeExtension<\/span>(<\/span>)<\/span>;<\/span>
\nsampleRate =<\/span> frame.<\/span>getSampleRate<\/span>(<\/span>)<\/span>;<\/span>
\nversion =<\/span> frame.<\/span>getVersion<\/span>(<\/span>)<\/span>;<\/span>
\ncopyright =<\/span> frame.<\/span>isCopyright<\/span>(<\/span>)<\/span>;<\/span>
\noriginal =<\/span> frame.<\/span>isOriginal<\/span>(<\/span>)<\/span>;<\/span>
\n\/\/ \u5e27\u6570\u91cf\u52a01<\/span>
\nframeCount++<\/span>;<\/span>
\n\/\/ \u5e27\u7387\u6dfb\u52a0\u5230\u96c6\u5408\u4e2d,\u5982\u679c\u6709\u4e0d\u540c\u591a\u4e2a\u503c\u8bf4\u660e\u662fVBR<\/span>
\naddBitrate<\/span>(<\/span>frame.<\/span>getBitrate<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\noffset +=<\/span> frame.<\/span>getLengthInBytes<\/span>(<\/span>)<\/span>;<\/span>
\nreturn<\/span> offset;<\/span>
\n}<\/span>
\n}<\/span> catch<\/span> (<\/span>InvalidDataException<\/span> e)<\/span> {<\/span>
\noffset++<\/span>;<\/span>
\n}<\/span>
\n}<\/span> else<\/span> {<\/span>
\noffset++<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\nreturn<\/span> offset;<\/span>
\n}<\/span><\/p>\n

\u8fd9\u91cc\u6309\u97f3\u9891\u5e27\u5934\u7684\u683c\u5f0f\u586b\u5145<\/p>\n

public<\/span> MpegFrame<\/span>(<\/span>byte<\/span> frameData1,<\/span> byte<\/span> frameData2,<\/span> byte<\/span> frameData3,<\/span> byte<\/span> frameData4)<\/span> throws<\/span> InvalidDataException<\/span> {<\/span>
\nlong<\/span> frameHeader =<\/span> BufferTools<\/span>.<\/span>unpackInteger<\/span>(<\/span>frameData1,<\/span> frameData2,<\/span> frameData3,<\/span> frameData4)<\/span>;<\/span>
\nsetFields<\/span>(<\/span>frameHeader)<\/span>;<\/span>
\n}<\/span><\/p>\n

private<\/span> void<\/span> setFields<\/span>(<\/span>long<\/span> frameHeader)<\/span> throws<\/span> InvalidDataException<\/span> {<\/span>
\nlong<\/span> frameSync =<\/span> extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_FRAME_SYNC)<\/span>;<\/span>
\nif<\/span> (<\/span>frameSync !=<\/span> FRAME_SYNC)<\/span> throw<\/span> new<\/span> InvalidDataException<\/span>(<\/span>"Frame sync missing"<\/span>)<\/span>;<\/span>
\nsetVersion<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_VERSION)<\/span>)<\/span>;<\/span>
\nsetLayer<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_LAYER)<\/span>)<\/span>;<\/span>
\nsetProtection<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_PROTECTION)<\/span>)<\/span>;<\/span>
\nsetBitRate<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_BITRATE)<\/span>)<\/span>;<\/span>
\nsetSampleRate<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_SAMPLE_RATE)<\/span>)<\/span>;<\/span>
\nsetPadding<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_PADDING)<\/span>)<\/span>;<\/span>
\nsetPrivate<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_PRIVATE)<\/span>)<\/span>;<\/span>
\nsetChannelMode<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_CHANNEL_MODE)<\/span>)<\/span>;<\/span>
\nsetModeExtension<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_MODE_EXTENSION)<\/span>)<\/span>;<\/span>
\nsetCopyright<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_COPYRIGHT)<\/span>)<\/span>;<\/span>
\nsetOriginal<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_ORIGINAL)<\/span>)<\/span>;<\/span>
\nsetEmphasis<\/span>(<\/span>extractField<\/span>(<\/span>frameHeader,<\/span> BITMASK_EMPHASIS)<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u5224\u65ad\u662f\u5426\u662f"Xing"\u5e27<\/p>\n

private<\/span> boolean<\/span> isXingFrame<\/span>(<\/span>byte<\/span>[<\/span>]<\/span> bytes,<\/span> int<\/span> offset)<\/span> {<\/span>
\nif<\/span> (<\/span>bytes.<\/span>length >=<\/span> offset +<\/span> XING_MARKER_OFFSET_1 +<\/span> 3<\/span>)<\/span> {<\/span>
\nif<\/span> (<\/span>"Xing"<\/span>.<\/span>equals<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>bytes,<\/span> offset +<\/span> XING_MARKER_OFFSET_1,<\/span> 4<\/span>)<\/span>)<\/span>)<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\nif<\/span> (<\/span>"Info"<\/span>.<\/span>equals<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>bytes,<\/span> offset +<\/span> XING_MARKER_OFFSET_1,<\/span> 4<\/span>)<\/span>)<\/span>)<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\nif<\/span> (<\/span>bytes.<\/span>length >=<\/span> offset +<\/span> XING_MARKER_OFFSET_2 +<\/span> 3<\/span>)<\/span> {<\/span>
\nif<\/span> (<\/span>"Xing"<\/span>.<\/span>equals<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>bytes,<\/span> offset +<\/span> XING_MARKER_OFFSET_2,<\/span> 4<\/span>)<\/span>)<\/span>)<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\nif<\/span> (<\/span>"Info"<\/span>.<\/span>equals<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>bytes,<\/span> offset +<\/span> XING_MARKER_OFFSET_2,<\/span> 4<\/span>)<\/span>)<\/span>)<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\nif<\/span> (<\/span>bytes.<\/span>length >=<\/span> offset +<\/span> XING_MARKER_OFFSET_3 +<\/span> 3<\/span>)<\/span> {<\/span>
\nif<\/span> (<\/span>"Xing"<\/span>.<\/span>equals<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>bytes,<\/span> offset +<\/span> XING_MARKER_OFFSET_3,<\/span> 4<\/span>)<\/span>)<\/span>)<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\nif<\/span> (<\/span>"Info"<\/span>.<\/span>equals<\/span>(<\/span>BufferTools<\/span>.<\/span>byteBufferToStringIgnoringEncodingIssues<\/span>(<\/span>bytes,<\/span> offset +<\/span> XING_MARKER_OFFSET_3,<\/span> 4<\/span>)<\/span>)<\/span>)<\/span>
\nreturn<\/span> true<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\n}<\/span>
\nreturn<\/span> false<\/span>;<\/span>
\n}<\/span><\/p>\n

<3>\u8bfb\u53d6\u97f3\u9891\u5e27<\/p>\n

private<\/span> int<\/span> scanBlock<\/span>(<\/span>byte<\/span>[<\/span>]<\/span> bytes,<\/span> int<\/span> bytesRead,<\/span> int<\/span> absoluteOffset,<\/span> int<\/span> offset)<\/span> throws<\/span> InvalidDataException<\/span> {<\/span>
\nwhile<\/span> (<\/span>offset <<\/span> bytesRead –<\/span> MINIMUM_BUFFER_LENGTH)<\/span> {<\/span>
\n \/\/ \u540c\u6837\u4f204\u5b57\u8282\u7684\u5e27\u5934\u521d\u59cb\u5316MpegFrame<\/span>
\nMpegFrame<\/span> frame =<\/span> new<\/span> MpegFrame<\/span>(<\/span>bytes[<\/span>offset]<\/span>,<\/span> bytes[<\/span>offset +<\/span> 1<\/span>]<\/span>,<\/span> bytes[<\/span>offset +<\/span> 2<\/span>]<\/span>,<\/span> bytes[<\/span>offset +<\/span> 3<\/span>]<\/span>)<\/span>;<\/span>
\n\/\/ \u5e27\u4fe1\u606f\u4e0d\u4e00\u81f4\u5bb9\u9519\u5904\u7406,\u4f1a\u629b\u5f02\u5e38<\/span>
\nsanityCheckFrame<\/span>(<\/span>frame,<\/span> absoluteOffset +<\/span> offset)<\/span>;<\/span>
\nint<\/span> newEndOffset =<\/span> absoluteOffset +<\/span> offset +<\/span> frame.<\/span>getLengthInBytes<\/span>(<\/span>)<\/span> –<\/span> 1<\/span>;<\/span>
\n\/\/ \u8981\u7ed9ID3v1\u7559128\u4e2a\u5b57\u8282\u4f4d\u7f6e<\/span>
\nif<\/span> (<\/span>newEndOffset <<\/span> maxEndOffset<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\nendOffset =<\/span> absoluteOffset +<\/span> offset +<\/span> frame.<\/span>getLengthInBytes<\/span>(<\/span>)<\/span> –<\/span> 1<\/span>;<\/span>
\nframeCount++<\/span>;<\/span>
\naddBitrate<\/span>(<\/span>frame.<\/span>getBitrate<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\noffset +=<\/span> frame.<\/span>getLengthInBytes<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span> else<\/span> {<\/span>
\nbreak<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\nreturn<\/span> offset;<\/span>
\n}<\/span><\/p>\n

ID3V2<\/h5>\n

ID3V2\u4e00\u5171\u6709\u56db\u4e2a\u7248\u672c，ID3V2.1\/2.2\/2.3\/2.4<\/p>\n

ID3V2.3\u7531\u4e00\u4e2a\u6807\u7b7e\u5934\u548c\u82e5\u5e72\u4e2a\u6807\u7b7e\u5e27\u6216\u8005\u4e00\u4e2a\u6269\u5c55\u6807\u7b7e\u5934\u7ec4\u6210，\u81f3\u5c11\u8981\u6709\u4e00\u4e2a\u6807\u7b7e\u5e27，\u6bcf\u4e00\u4e2a\u6807\u7b7e\u5e27\u8bb0\u5f55\u4e00\u79cd\u4fe1\u606f，\u4f8b\u5982\u4f5c\u66f2\u3001\u6807\u9898\u7b49<\/p>\n

\u6807\u7b7e\u5934<\/h6>\n

\u4f4d\u4e8e\u6587\u4ef6\u5f00\u59cb\u5904，\u957f\u5ea6\u4e3a10\u5b57\u8282<\/p>\n

char<\/span> Header[<\/span>3<\/span>]<\/span>;<\/span> \/*\u5fc5\u987b\u4e3a\u201cID3\u201d\u5426\u5219\u8ba4\u4e3a\u6807\u7b7e\u4e0d\u5b58\u5728*\/<\/span>
\nchar<\/span> Ver;<\/span> \/*\u7248\u672c\u53f7ID3V2.3 \u5c31\u8bb0\u5f553*\/<\/span>
\nchar<\/span> Revision;<\/span> \/*\u526f\u7248\u672c\u53f7\u6b64\u7248\u672c\u8bb0\u5f55\u4e3a0*\/<\/span><\/p>\n

\/\/ \u6807\u5fd7\u5b57\u8282\u4e00\u822c\u4e3a0，\u5b9a\u4e49\u5982\u4e0b(abc000000B)<\/span>
\n\/\/ a：\u8868\u793a\u662f\u5426\u4f7f\u7528Unsynchronisation<\/span>
\n\/\/ b：\u8868\u793a\u662f\u5426\u6709\u6269\u5c55\u5934\u90e8，\u4e00\u822c\u6ca1\u6709，\u6240\u4ee5\u4e00\u822c\u4e5f\u4e0d\u8bbe\u7f6e<\/span>
\n\/\/ c：\u8868\u793a\u662f\u5426\u4e3a\u6d4b\u8bd5\u6807\u7b7e，99.99%\u7684\u6807\u7b7e\u90fd\u4e0d\u662f\u6d4b\u8bd5\u6807\u7b7e，\u4e0d\u8bbe\u7f6e<\/span>
\nchar<\/span> Flag;<\/span> \/*\u6807\u5fd7\u5b57\u8282，\u53ea\u4f7f\u7528\u9ad8\u4e09\u4f4d，\u5176\u5b83\u4f4d\u4e3a0 *\/<\/span><\/p>\n

\/\/ \u6807\u7b7e\u5927\u5c0f\u5171\u56db\u4e2a\u5b57\u8282，\u6bcf\u4e2a\u5b57\u8282\u53ea\u4f7f\u7528\u4f4e7\u4f4d，\u6700\u9ad8\u4f4d\u4e0d\u4f7f\u7528\u6052\u4e3a0,\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b：<\/span>
\n\/\/ Size = (Size[0] & 0x7F) * 0x200000 + (Size[1] & 0x7F) * 0x400+(Size[2] & 0x7F) * 0x80 + (Size[3] & 0x7F)<\/span>
\nchar<\/span> Size[<\/span>4<\/span>]<\/span>;<\/span> \/*\u6807\u7b7e\u5927\u5c0f*\/<\/span><\/p>\n

\u6807\u7b7e\u5e27<\/h6>\n

\u6bcf\u4e2a\u6807\u7b7e\u5e27\u90fd\u670910\u4e2a\u5b57\u8282\u7684\u5e27\u5934\u548c\u81f3\u5c11\u4e00\u4e2a\u5b57\u8282\u7684\u5185\u5bb9\u6784\u6210<\/p>\n

\/\/ TIT2: \u6807\u98985449 5432<\/span>
\n\/\/ TPE1: \u4f5c\u8005<\/span>
\n\/\/ TALB: \u4e13\u96c6<\/span>
\n\/\/ TRCK: \u97f3\u8f68\u683c\u5f0f N\/M \u5176\u4e2dN\u4e3a\u4e13\u96c6\u4e2d\u7684\u7b2cN\u9996，M\u4e3a\u4e13\u96c6\u4e2d\u5171M\u9996，N\u548cM \u4e3aASCII \u7801\u8868\u793a\u7684\u6570\u5b57<\/span>
\n\/\/ TYPE: \u5e74\u4ee3<\/span>
\n\/\/ COMM: \u5907\u6ce8,\u683c\u5f0f: "eng\\\\0\u5907\u6ce8\u5185\u5bb9"，\u5176\u4e2deng \u8868\u793a\u5907\u6ce8\u6240\u4f7f\u7528\u7684\u81ea\u7136\u8bed\u8a00<\/span>
\nchar<\/span> ID[<\/span>4<\/span>]<\/span>;<\/span> \/*\u6807\u8bc6\u5e27，\u8bf4\u660e\u5176\u5185\u5bb9，\u4f8b\u5982\u4f5c\u8005\/\u6807\u9898\u7b49*\/<\/span>
\n\/\/ \u5e27\u5185\u5bb9\u5927\u5c0f，\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b：<\/span>
\n\/\/ Size = Size[0]*0x100000000 + Size[1]*0x10000+ Size[2]*0x100 +Size[3];<\/span>
\nchar<\/span> Size[<\/span>4<\/span>]<\/span>;<\/span> \/*\u5e27\u5185\u5bb9\u7684\u5927\u5c0f，\u4e0d\u5305\u62ec\u5e27\u5934，\u4e0d\u5f97\u5c0f\u4e8e1*\/<\/span>
\n\/\/ \u6807\u5fd7\u5e27，\u4f7f\u7528\u6bcf\u4e2a\u5b57\u8282\u7684\u9ad8\u4e09\u4f4d，\u5176\u4ed6\u4f4d\u5747\u4e3a0(abc00000B xyz00000B)<\/span>
\n\/\/ a — \u6807\u7b7e\u4fdd\u62a4\u6807\u5fd7，\u8bbe\u7f6e\u65f6\u8ba4\u4e3a\u6b64\u5e27\u4f5c\u5e9f<\/span>
\n\/\/ b — \u6587\u4ef6\u4fdd\u62a4\u6807\u5fd7，\u8bbe\u7f6e\u65f6\u8ba4\u4e3a\u6b64\u5e27\u4f5c\u5e9f<\/span>
\n\/\/ c — \u53ea\u8bfb\u6807\u5fd7，\u8bbe\u7f6e\u65f6\u8ba4\u4e3a\u6b64\u5e27\u4e0d\u80fd\u4fee\u6539<\/span>
\n\/\/ x — \u538b\u7f29\u6807\u5fd7，\u8bbe\u7f6e\u65f6\u4e00\u4e2a\u5b57\u8282\u5b58\u653e\u4e24\u4e2aBCD \u7801\u8868\u793a\u6570\u5b57<\/span>
\n\/\/ y — \u52a0\u5bc6\u6807\u5fd7<\/span>
\n\/\/ z — \u7ec4\u6807\u5fd7，\u8bbe\u7f6e\u65f6\u8bf4\u660e\u6b64\u5e27\u548c\u5176\u4ed6\u7684\u67d0\u5e27\u662f\u4e00\u7ec4<\/span>
\nchar<\/span> Flags[<\/span>2<\/span>]<\/span>;<\/span> \/*\u6807\u5fd7\u5e27，\u53ea\u5b9a\u4e49\u4e866 \u4f4d*\/<\/span><\/p>\n

\u9a8c\u8bc1<\/h6>\n

\u6253\u5370MP3\u6587\u4ef6\u4e2d\u7684Id3v2<\/p>\n

.<\/span>.<\/span>.<\/span>
\npublic<\/span> void<\/span> getID3v2Tag<\/span>(<\/span>String<\/span> filename)<\/span> throws<\/span> InvalidDataException<\/span>,<\/span> UnsupportedTagException<\/span>,<\/span> IOException<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\\\\n========================MP3 ID3v2============================"<\/span>)<\/span>;<\/span>
\n Mp3File<\/span> mp3file =<\/span> new<\/span> Mp3File<\/span>(<\/span>filename)<\/span>;<\/span>
\n if<\/span> (<\/span>mp3file.<\/span>hasId3v2Tag<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n ID3v2<\/span> id3v2Tag =<\/span> mp3file.<\/span>getId3v2Tag<\/span>(<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Track: "<\/span> +<\/span> id3v2Tag.<\/span>getTrack<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Artist: "<\/span> +<\/span> id3v2Tag.<\/span>getArtist<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Title: "<\/span> +<\/span> id3v2Tag.<\/span>getTitle<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Album: "<\/span> +<\/span> id3v2Tag.<\/span>getAlbum<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Year: "<\/span> +<\/span> id3v2Tag.<\/span>getYear<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Genre: "<\/span> +<\/span> id3v2Tag.<\/span>getGenre<\/span>(<\/span>)<\/span> +<\/span> " ("<\/span> +<\/span> id3v2Tag.<\/span>getGenreDescription<\/span>(<\/span>)<\/span> +<\/span> ")"<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Comment: "<\/span> +<\/span> id3v2Tag.<\/span>getComment<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Lyrics: "<\/span> +<\/span> id3v2Tag.<\/span>getLyrics<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Composer: "<\/span> +<\/span> id3v2Tag.<\/span>getComposer<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Publisher: "<\/span> +<\/span> id3v2Tag.<\/span>getPublisher<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Original artist: "<\/span> +<\/span> id3v2Tag.<\/span>getOriginalArtist<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Album artist: "<\/span> +<\/span> id3v2Tag.<\/span>getAlbumArtist<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Copyright: "<\/span> +<\/span> id3v2Tag.<\/span>getCopyright<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"URL: "<\/span> +<\/span> id3v2Tag.<\/span>getUrl<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Encoder: "<\/span> +<\/span> id3v2Tag.<\/span>getEncoder<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n byte<\/span>[<\/span>]<\/span> albumImageData =<\/span> id3v2Tag.<\/span>getAlbumImage<\/span>(<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>albumImageData !=<\/span> null<\/span>)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Have album image data, length: "<\/span> +<\/span> albumImageData.<\/span>length +<\/span> " bytes"<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"Album image mime type: "<\/span> +<\/span> id3v2Tag.<\/span>getAlbumImageMimeType<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>
\n.<\/span>.<\/span>.<\/span><\/p>\n

\u7ed3\u679c\u5982\u4e0b<\/p>\n

\"2025-04-22<\/p>\n

\u4ece\u7f51\u4e0a\u4e0b\u8f7d\u7684\u4e00\u4e9bmp3\u6587\u4ef6\u56e0\u4e3a\u662f\u9759\u6001\u7801\u7387,\u6240\u4ee5\u6ca1\u6709\u6807\u7b7e\u5934，\u7528Sublime Text\u6253\u5f00\u540e\u5c31\u662f<\/p>\n

\"2025-04-22<\/p>\n

\u7528FFmpeg\u628apcm\u538b\u7f29\u7f16\u7801\u4e3amp3\u4f1a\u52a0\u4e0a<\/p>\n

$ ffmpeg -y -i v24tagswithalbumimage.mp3 -acodec pcm_s16le -f s16le -ac 2 -ar 44100 v24tagswithalbumimage.pcm<\/p>\n

v24tagswithalbumimage.mp3\u6587\u4ef6\u7684\u4e8c\u8fdb\u5236<\/p>\n

\u6807\u7b7e\u5934<\/p>\n

\"Snip20250422_3.png\"<\/p>\n

Header[3] + Version\u662f4944 3304:\u5c31\u662f ID3v2\u548c \u7b2c4\u7248 Revision:0 Flag:0 \u4e0d\u4f7f\u7528Unsynchronisation，\u6ca1\u6709\u6269\u5c55\u5934，\u975e\u6d4b\u8bd5\u6807\u7b7e<\/p>\n

Size[4]\u662f1841\u6839\u636e\u4e0a\u9762\u63d0\u5230\u7684\u516c\u5f0f<\/p>\n

Size =<\/span> (<\/span>Size[<\/span>0<\/span>]<\/span> &<\/span> 0x7F<\/span>)<\/span> *<\/span> 0x200000<\/span> +<\/span> (<\/span>Size[<\/span>1<\/span>]<\/span> &<\/span> 0x7F<\/span>)<\/span> *<\/span> 0x400<\/span>+<\/span>(<\/span>Size[<\/span>2<\/span>]<\/span> &<\/span> 0x7F<\/span>)<\/span> *<\/span> 0x80<\/span> +<\/span> (<\/span>Size[<\/span>3<\/span>]<\/span> &<\/span> 0x7F<\/span>)<\/span><\/p>\n

\u8ba1\u7b97: (0x18 & 0x7F) * 0x80 + (0x41 & 0x7F) = 0x18 * 0x80 + 0x41 = 3137<\/p>\n

\u52a0\u4e0a\u5934\u768410\u4e2a\u5b57\u8282,\u6240\u4ee5mp3\u6587\u4ef6\u7684ID3v2\u90e8\u5206\u662f 3147<\/p>\n

\u8fd9\u4e2a\u8c03\u8bd5\u7684\u65f6\u5019\u4e5f\u53ef\u4ee5\u9a8c\u8bc1<\/p>\n

\"2025-04-22<\/p>\n

var1 \u662fmp3\u6587\u4ef6, var3 \u662f\u88ab\u8ba4\u4e3aID3v2\u7684\u5185\u5bb9\u3002<\/p>\n

\u5bfb\u627e\u9996\u4e2a\u97f3\u9891\u5e27<\/h5>\n

\/\/ \u6839\u636eID3v2\u7684size + \u4e0a\u9762\u7684\u516c\u5f0f + ID3v2\u7684\u6587\u4ef6\u5934
\n0x1841 => 0x41 + 0x18 << 7 = 3137
\n3137 + 10 = 3147<\/p>\n

3147 = 196 * 16 + 11<\/p>\n

\"2025-04-22<\/p>\n

\u6839\u636e\u524d4\u4e2a\u5b57\u8282 0xfffb9044<\/p>\n

0b1111 1111 111\/ 11 \/ 01 \/ 0 \/ 1001 \/ 00 \/ 0 \/ 0 \/ 01 \/ 00 0 \/ 1 \/ 00<\/p>\n

\u540c\u6b65\u4fe1\u606f: 0xfffb \u524d11\u4e2a\u90fd\u662f1 \u7248\u672c:11-\u8bf4\u660e\u662fMPEG 1 \u5c42:01-\u8bf4\u660e\u662fLayer 3 \u662fMP3\u7b26\u5408\u9884\u671f CRC: 0 \u4e0d\u6821\u9a8c \u4f4d\u7387: 1001，\u56e0\u4e3a\u662fMPEG 1 + Layer 3，\u6839\u636e\u4e0a\u9762\u7684\u7801\u8868 \u53d6\u6837\u7387:128kbps \u91c7\u6837\u7387: 00,\u56e0\u4e3a\u662fMPEG 1\u8bf4\u660e\u662f44.1kHz \u5e27\u957f\u8c03\u8282: 0，\u65e0\u9700\u8c03\u6574 \u4fdd\u7559\u5b57: 0 \u58f0\u9053\u6a21\u5f0f: 01 .Joint \u5173\u95ed\u5f3a\u5ea6\u7acb\u4f53\u58f0 + MS\u7acb\u4f53\u58f0 \u6269\u5145\u6a21\u5f0f: 00 \u7248\u6743:0,\u4e0d\u5408\u6cd5 \u539f\u7248:1,\u539f\u7248 \u5f3a\u8c03\u65b9\u5f0f: 00<\/p>\n

\u53c2\u8003<\/h3>\n
  • \u97f3\u9891\u683c\u5f0f\u4e4bMP3：（1)MP3\u5c01\u88c5\u683c\u5f0f\u7b80\u4ecb<\/li>\n
  • \u9759\u6001\u7801\u7387（CBR）\u548c\u52a8\u6001\u7801\u7387（VBR）<\/li>\n
  • MP3\u6587\u4ef6\u7ed3\u6784\u89e3\u6790(\u8d85\u8be6\u7ec6)<\/li>\n","protected":false},"excerpt":{"rendered":"

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