{"id":5430,"date":"2022-07-10T14:39:03","date_gmt":"2022-07-10T14:39:03","guid":{"rendered":"https:\/\/mp4gain.com\/mp4gain\/?p=5430"},"modified":"2022-07-10T14:39:03","modified_gmt":"2022-07-10T14:39:03","slug":"audio-intro-part-3","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/audio-intro-part-3\/","title":{"rendered":"Audio Intro Part 3"},"content":{"rendered":"

Audio Intro Part 3<\/h2>\n
\"Audio
Audio Intro<\/figcaption><\/figure>\n

WAV<\/p>\n

\"Audio
Audio Intro<\/figcaption><\/figure>\n

structure
\nfile header
\nThe WAV format follows the RIFF Resource Interchange File Format, so the WAV format is actually a three-layer relationship, which is simplified here. Its file header format is as follows:<\/p>\n

Address Carving type content
\n00H-03H 4 character * 4 RIFF resource file exchange flag
\n04H-07H 4 unsigned int The number of bytes from the next address to the end of the file.
\n08H-0BH 4 character * 4 WAV file WAVE logo
\n0CH-0FH 4 character * 4 fmt wave file flag, the last digit is 0x20 space
\n10H-13H 4 unsigned int The size of the subchunk file header. For the WAV subfragment, the value is 0x10.
\n14H-15H 2 short unsigned Format type, when the value is 1, it means the data is linear PCM encoding
\n16H-17H 2 short unsigned number of channels
\n18H-1BH 4 int unsigned Sampling rate
\n1CH-1FH 4 int unsigned Wave file bytes per second = sample rate Bit depth PCM \/ 8 channels
\n20H-21H 2 short unsigned DATA data block unit length = number of channels * PCM bit depth \/ 8
\n22H-23H 2 short unsigned Bit depth PCM
\n24H-27H 4 character * 4 data stamp data
\n28H-2BH 4 unsigned int Total length of data part (bytes)
\nstruct WAVHeader
\n{ char RIFF[ 4 ]; \/\/\/Resource file exchange flag RIFF unsigned LEN; \/\/\/Number of bytes from the next address to the end of the file char WAV[ 4 ]; \/\/\/WAV file flag WAVE char FMT [ 4 ]; \/\/\/Wave fmt file pointer, last digit is 0x20 space unsigned SubchunkSize; \/\/\/The size of the sub-chunk file header, for WAV this sub-chunk, the value is 0x10 DATATYPE short unsigned; \/ \/\/Format type, when the value is 1, it means the data is unsigned linear PCM encoding short CH ; \/\/\/Number of unsigned channels F; \/\/\/Unsigned sample rate BYTERATE; \/\/\/Number of bytes per second of wave file = sample rate*PCM bit depth\/8*Number of unsigned channels<\/p>\n

short DATAUNITLEN; \/\/\/DATA block unit length=channel number*Bit depth PCM\/8 unsigned short BITDEPTH; \/\/\/Bit depth character PCM DATA[ 4 ]; \/\/\/Data flag data unsigned DATALEN ; \/\/\/Data partial total length (bytes) };<\/p>\n

data organization
\nAfter the file header is the data part of the WAV file. Its data organization is: the left channel value of the first sample point, the right channel value of the first sample point, …, the left channel value of the last sample point, the right channel value of the last sample point value. Each value has a bit depth of bits.<\/p>\n

Generate a simple wav
\nFirst complete the Wav header.<\/p>\n

WAVHeader getHeader ( int number )
\n{
\nWAV Header res; memcpy (res.RIFF, “RIFF” , sizeof (res.RIFF)); memcpy (res.WAV, “WAVE” , sizeof (res.WAV)); memcpy (res.FMT, “fmt ” , size of ( res.FMT )); res.SubchunkSize= 0x10 ; res.DATATYPE= 1 ; res.CH= 2 ; res.F=F; res.BITDEPTH=DEPTH; res.BYTERATE=res.F*res.BITDEPTH\/ 8 *res.CH; res.DATAUNITLEN=res.CH*res.BITDEPTH\/ 8 ; memcpy(res.DATA, “data”<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

, size of ( res.DATA ));
\nres.DATALEN=num*res.DATAUNITLEN;
\nres.LEN=res.DATALEN+ 44 -8 ; returnres; }<\/p>\n

First, define the key name – frequency comparison table.<\/p>\n

const double keyf[]=
\n{ 27.5 , 29.1352 , 30.8677 , 32.7032 , 34.6478 , 36.7081 , 38.8909 , 41.2034 , 43.6535 , 46.2493 , 48.9994 , 51.9131 , 55 , 58.2705 , 61.7354 , 65.4064 , 69.2957 , 73.4162 , 77.7817 , 82.4069 , 87.3071 , 92.4986 , 97.9989 ,<\/p>\n

103.826 , 110 , 116.541 , 123.471 , 130.813 , 138.591 , 146.832 , 155.563 , 164.814 , 174.614 , 184.997 , 195.998 , 207.652 , 220 , 233.082 , 246.942 , 261.626 , 277.183 , 293.665 , 311.127 , 329.628 , 349.228 , 369.994 , 391.995 , 415.305 , 440<\/p>\n

, 466.164 , 493.883 , 523.251 , 554.365 , 587.33 , 622.254 , 659.255 , 698.456 , 739.989 , 783.991 , 830.609 , 880 , 932.328 , 987.767 , 1046.5 , 1108.73 , 1174.66 , 1244.51 , 1318.51 , 1396.91 , 1479.98 , 1567.98 , 1661.22 , 1760 , 1864.66 ,<\/p>\n

1975.53 , 2093 , 2217.46 , 2349.32 , 2489.02 , 2637.02 , 2793.83 , 2959.96 , 3135.96 , 3322.44 , 3729.31 , 3951.07 , 4186.01 } ___ { “A-0” , “A#0” , “B- 0” , “C-1” , “C#1” , “D-1” , “D#1” , “E-1” , “F-1”, “F#1”<\/p>\n

 <\/p>\n

, “G-1” , “G#1” , “A-1” , “A#1” , “B-1” , “C-2” , “C#2” , “D-2″ , ” D#2″ , “E-2” , “F-2” , “F#2” , “G-2” , “G#2” , “A-2” , “A#2” , “B- 2” , “C-3” , “C#3” , “D-3” , “D#3” , “E-3” , “F-3” , “F#3” , “G-3” , “sun#3” ,<\/p>\n","protected":false},"excerpt":{"rendered":"

Audio Intro Part 3 WAV structure file header The WAV format follows the RIFF Resource Interchange File Format, so the WAV format is actually a three-layer relationship, which is simplified here. Its file header format is as follows: Address Carving type content 00H-03H 4 character * 4 RIFF resource file exchange flag 04H-07H 4 unsigned … Continue reading “Audio Intro Part 3”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[257],"tags":[67973,10670,84293,84296,84285,10752,84310,84297,84294,84298,84323,84295,84301,84299,84300,45030,84303,14956,10641,38118,38115,84368,19873,10779,84340,84335,84307,84287,84291,14955,84305,84308,84306,38122,84309,10789,84377,84314,84315,84313,84311,84312,84316,47005,84322,84321,84332,84286,84330,84325,84333,84334,84329,27979,84328,84331,84336,14962,10693,38137,84338,84341,84337,38145,84345,84317,84344,84346,84288,14970,14968,84347,14969,14971,84354,84353,84351,84356,84355,84352,84363,84360,84364,38151,84359,38154,10698,84367,10700,84371,84324,38148,84376,84372,84375,84374,84373,84290,32884,67372,19793,19792,32888,84318,84370,20379,19912,10804,19908,19915,10635,10639,38106,14952,10650,55657,38152,10620,19876,10659,10651,14950,84304,10652,10664,38130,10665,84326,84327,38134,38105,55660,10600,10597,10599,10596,10673,10674,10617,10687,19889,10711,10706,38157,84379,10716,84378,38125,32893,71757,19830,10677,38142,84343,22360,19838,67421,32900,84342,67420,38141,19854,67431,19857,84365,19858,84366,84369,10701,67437,10714,10713,32887,67387,32891,32892,19767,84320,84319,32880,19828,84350,84349,32901,19844,84348,19775,32879,19866,19867,84501,19807,19769,19803,38114,84361,84362,84289,84339,14979,46993,84302,84292,71054,84357,84358,14977],"class_list":["post-5430","post","type-post","status-publish","format-standard","hentry","category-audio-normalizer","tag-aac-mp3-bitrate-comparison","tag-aac-mp3-bitrate-equivalent","tag-aac-vs-mp3-bitrate-equivalent","tag-abcde-mp3-bitrate","tag-amazon-mp3-bitrate","tag-amazon-mp3-bitrate-quality","tag-amazon-mp3-download-bitrate","tag-amazon-music-download-mp3-bitrate","tag-amazon-music-mp3-bitrate","tag-apple-music-mp3-bitrate","tag-audacity-change-mp3-export-bitrate","tag-audacity-mp3-bitrate","tag-batch-convert-mp3-bitrate","tag-batch-mp3-bitrate-converter","tag-beatport-mp3-bitrate","tag-best-audio-bitrate-for-mp4","tag-best-bitrate-to-rip-cd-to-mp3","tag-best-free-mp3-bitrate-converter","tag-best-mp3-bitrate","tag-best-mp3-bitrate-and-sample-rate","tag-best-mp3-bitrate-converter","tag-bitrate-320-kbps-mp3","tag-bitrate-mp3-amazon","tag-bitrate-yang-bagus-untuk-mp3","tag-c-get-mp3-bitrate","tag-c-mp3-get-bitrate","tag-cd-quality-mp3-bitrate","tag-change-mp3-bitrate","tag-change-mp3-bitrate-audacity","tag-change-mp3-bitrate-free","tag-check-mp3-bitrate","tag-check-mp3-bitrate-mac","tag-check-mp3-bitrate-online","tag-convert-mp3-bitrate","tag-convert-mp3-bitrate-freeware","tag-convert-mp3-bitrate-windows-media-player","tag-convert-mp3-to-lower-bitrate","tag-default-mp3-bitrate","tag-dfplayer-mini-mp3-bitrate","tag-display-mp3-bitrate","tag-download-mp3-bitrate-converter","tag-download-mp3-bitrate-tinggi","tag-download-youtube-mp3-bitrate","tag-edit-bitrate-mp3","tag-edit-bitrate-mp3-online","tag-encode-mp3-bitrate","tag-ffmpeg-convert-mp3-bitrate","tag-ffmpeg-mp3-bitrate","tag-ffmpeg-mp3-bitrate-change","tag-ffmpeg-mp3-bitrate-example","tag-find-mp3-bitrate","tag-find-mp3-bitrate-mac","tag-fl-studio-mp3-bitrate","tag-flac-vs-mp3-bitrate","tag-free-mp3-bitrate-converter","tag-free-mp3-bitrate-converter-download","tag-garageband-mp3-bitrate","tag-get-mp3-bitrate","tag-get-mp3-bitrate-javascript","tag-get-mp3-bitrate-python","tag-goede-bitrate-voor-mp3","tag-goede-mp3-bitrate","tag-good-mp3-bitrate","tag-high-quality-mp3-bitrate","tag-highest-mp3-bitrate","tag-how-do-i-change-the-bitrate-of-an-mp3","tag-how-to-change-mp3-bitrate","tag-how-to-change-mp3-bitrate-online","tag-how-to-check-mp3-bitrate","tag-how-to-check-mp3-bitrate-android","tag-how-to-check-mp3-bitrate-mac","tag-how-to-convert-mp3-bitrate-on-itunes","tag-how-to-increase-mp3-bitrate","tag-how-to-see-mp3-bitrate-on-mac","tag-ideal-mp3-bitrate","tag-increase-mp3-bitrate","tag-increase-mp3-bitrate-online","tag-iphone-mp3-bitrate","tag-itunes-convert-mp3-bitrate","tag-itunes-mp3-bitrate","tag-jak-sprawdzic-bitrate-mp3","tag-jak-zmienic-bitrate-mp3","tag-jak-zmniejszyc-bitrate-mp3","tag-jakosc-mp3-bitrate","tag-javascript-get-mp3-bitrate","tag-k3b-mp3-bitrate","tag-kbps-mp3-bitrate","tag-know-mp3-bitrate","tag-kualitas-bitrate-mp3","tag-lame-mp3-bitrate","tag-lame-mp3-encoder-bitrate","tag-linux-mp3-bitrate-info","tag-low-mp3-bitrate","tag-lower-mp3-bitrate","tag-lower-mp3-bitrate-online","tag-lowest-acceptable-mp3-bitrate","tag-lowest-mp3-bitrate","tag-mp3-audio-bitrate","tag-mp3-audio-quality-best","tag-mp3-audio-quality-enhancer","tag-mp3-bad-quality","tag-mp3-best-quality-settings","tag-mp3-best-quality-songs-download","tag-mp3-bit-rate-explained","tag-mp3-bit-rate-logic-x","tag-mp3-bitrate","tag-mp3-bitrate-128-kbps","tag-mp3-bitrate-192-kbps","tag-mp3-bitrate-192-vs-320","tag-mp3-bitrate-320-kbps","tag-mp3-bitrate-analyzer","tag-mp3-bitrate-blind-test","tag-mp3-bitrate-calculator","tag-mp3-bitrate-changer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Intro Part 3 - mp4gain.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-intro-part-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Audio Intro Part 3 - mp4gain.com\" \/>\n<meta property=\"og:description\" content=\"Audio Intro Part 3 WAV structure file header The WAV format follows the RIFF Resource Interchange File Format, so the WAV format is actually a three-layer relationship, which is simplified here. Its file header format is as follows: Address Carving type content 00H-03H 4 character * 4 RIFF resource file exchange flag 04H-07H 4 unsigned … Continue reading "Audio Intro Part 3"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mp4gain.com\/mp4gain\/audio-intro-part-3\/\" \/>\n<meta property=\"og:site_name\" content=\"mp4gain.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/mp4gain\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-10T14:39:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/dlpure.com\/wp-content\/uploads\/2020\/09\/1598906281.png\" \/>\n<meta name=\"author\" content=\"R. Arias\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@mp4gain\" \/>\n<meta name=\"twitter:site\" content=\"@mp4gain\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"R. 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Arias\",\"@id\":\"https:\/\/mp4gain.com\/mp4gain\/#\/schema\/person\/36ffddda9988e565bd4a9013324ce2cc\"},\"headline\":\"Audio Intro Part 3\",\"datePublished\":\"2022-07-10T14:39:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/mp4gain.com\/mp4gain\/audio-intro-part-3\/\"},\"wordCount\":541,\"image\":{\"@id\":\"https:\/\/mp4gain.com\/mp4gain\/audio-intro-part-3\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/dlpure.com\/wp-content\/uploads\/2020\/09\/1598906281.png\",\"keywords\":[\"aac mp3 bitrate comparison\",\"aac mp3 bitrate equivalent\",\"aac vs mp3 bitrate equivalent\",\"abcde mp3 bitrate\",\"amazon mp3 bitrate\",\"amazon mp3 bitrate quality\",\"amazon mp3 download bitrate\",\"amazon music download mp3 bitrate\",\"amazon music mp3 bitrate\",\"apple music mp3 bitrate\",\"audacity change mp3 export bitrate\",\"audacity mp3 bitrate\",\"batch convert mp3 bitrate\",\"batch mp3 bitrate converter\",\"beatport mp3 bitrate\",\"best audio bitrate for mp4\",\"best bitrate to rip cd to 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