{"id":31512,"date":"2023-02-13T07:51:14","date_gmt":"2023-08-06T00:06:56","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%8f%aa%e9%9c%80%e4%bd%bf%e7%94%a8java%e8%bf%9b%e8%a1%8c%e9%87%8d%e9%87%87%e6%a0%b7\/"},"modified":"2024-04-29T14:23:57","modified_gmt":"2024-04-29T06:23:57","slug":"%e5%8f%aa%e9%9c%80%e4%bd%bf%e7%94%a8java%e8%bf%9b%e8%a1%8c%e9%87%8d%e9%87%87%e6%a0%b7","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%8f%aa%e9%9c%80%e4%bd%bf%e7%94%a8java%e8%bf%9b%e8%a1%8c%e9%87%8d%e9%87%87%e6%a0%b7\/","title":{"rendered":"\u53ea\u9700\u4f7f\u7528Java\u8fdb\u884c\u91cd\u91c7\u6837"},"content":{"rendered":"

\u8fd9\u662f\u4e00\u4e2a\u4ecePC\u9ea6\u514b\u98ce\u4ee58000Hz\/16bit\u83b7\u53d6\u7684\u793a\u4f8b\uff0c\u91c7\u7528\u7ebf\u6027\u63d2\u503c\u8f6c\u6362\u4e3a16000Hz\/16bit\u7684\u91c7\u6837\u3002<\/p>\n

import<\/span> static<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>System<\/span>.<\/span>out<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Arrays<\/span>;<\/span>\r\n\r\nimport<\/span> javax.sound.sampled.AudioFormat<\/span>;<\/span>\r\nimport<\/span> javax.sound.sampled.AudioSystem<\/span>;<\/span>\r\nimport<\/span> javax.sound.sampled.DataLine<\/span>;<\/span>\r\nimport<\/span> javax.sound.sampled.TargetDataLine<\/span>;<\/span>\r\nimport<\/span> javax.sound.sampled.DataLine.Info<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> MicrophoneResamplingTest<\/span> {<\/span>\r\n\r\n    \/\/ SampleRate:8000Hz, SampleSizeInBits: 16, Number of channels: 1, Signed:true, bigEndian: false<\/span>\r\n    public<\/span> static<\/span> final<\/span> AudioFormat<\/span> audioFormat<\/span> =<\/span> new<\/span> AudioFormat<\/span>(<\/span>8000<\/span>,<\/span> 16<\/span>,<\/span> 1<\/span>,<\/span> true<\/span>,<\/span> false<\/span>);<\/span>\r\n\r\n    \/\/ Set the system information to read from the microphone audio stream<\/span>\r\n    public<\/span> static<\/span> final<\/span> DataLine<\/span>.<\/span>Info<\/span> targetInfo<\/span> =<\/span> new<\/span> Info<\/span>(<\/span>TargetDataLine<\/span>.<\/span>class<\/span>,<\/span> audioFormat<\/span>);<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        if<\/span> (!<\/span>AudioSystem<\/span>.<\/span>isLineSupported<\/span>(<\/span>targetInfo<\/span>))<\/span> {<\/span>\r\n            out<\/span>.<\/span>println<\/span>(<\/span>\"Microphone not supported\"<\/span>);<\/span>\r\n            return<\/span>;<\/span>\r\n        }<\/span>\r\n        new<\/span> MicrophoneResamplingTest<\/span>().<\/span>test<\/span>();<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ \u30de\u30a4\u30af\u97f3\u58f0\u3092\u53d6\u5f97\u3057\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0<\/span>\r\n    void<\/span> test<\/span>()<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        TargetDataLine<\/span> dataLine<\/span> =<\/span> (<\/span>TargetDataLine<\/span>)<\/span> AudioSystem<\/span>.<\/span>getLine<\/span>(<\/span>targetInfo<\/span>);<\/span>\r\n        dataLine<\/span>.<\/span>open<\/span>(<\/span>audioFormat<\/span>);<\/span>\r\n        dataLine<\/span>.<\/span>start<\/span>();<\/span>\r\n\r\n        byte<\/span>[]<\/span> bytes<\/span> =<\/span> new<\/span> byte<\/span>[<\/span>1024<\/span>];<\/span>\r\n\r\n        while<\/span> (<\/span>dataLine<\/span>.<\/span>isOpen<\/span>())<\/span> {<\/span>\r\n            int<\/span> numBytesRead<\/span> =<\/span> dataLine<\/span>.<\/span>read<\/span>(<\/span>bytes<\/span>,<\/span> 0<\/span>,<\/span> bytes<\/span>.<\/span>length<\/span>);<\/span>\r\n            if<\/span> ((<\/span>numBytesRead<\/span> <=<\/span> 0<\/span>)<\/span> &&<\/span> (<\/span>dataLine<\/span>.<\/span>isOpen<\/span>()))<\/span>\r\n                continue<\/span>;<\/span>\r\n\r\n            \/\/ \u4f8b:8000Hz\u304b\u308916000Hz\u306eupsampling<\/span>\r\n            byte<\/span>[]<\/span> resampled<\/span> =<\/span> resampling<\/span>(<\/span>bytes<\/span>,<\/span> 16<\/span>,<\/span> 8000<\/span>,<\/span> 16000<\/span>);<\/span>\r\n            out<\/span>.<\/span>println<\/span>(<\/span>Arrays<\/span>.<\/span>toString<\/span>(<\/span>resampled<\/span>));<\/span>\/\/ \u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3055\u308c\u305f\u30c7\u30fc\u30bf<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ \u7dda\u5f62\u88dc\u9593\u306b\u3088\u308b\u30ea\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0<\/span>\r\n    byte<\/span>[]<\/span> resampling<\/span>(<\/span>byte<\/span>[]<\/span> sourceData<\/span>,<\/span> int<\/span> bitsPerSample<\/span>,<\/span> int<\/span> sourceRate<\/span>,<\/span> int<\/span> targetRate<\/span>)<\/span> {<\/span>\r\n        int<\/span> bytePerSample<\/span> =<\/span> bitsPerSample<\/span> \/<\/span> 8<\/span>;<\/span>\r\n        int<\/span> numSamples<\/span> =<\/span> sourceData<\/span>.<\/span>length<\/span> \/<\/span> bytePerSample<\/span>;<\/span>\r\n        short<\/span>[]<\/span> amplitudes<\/span> =<\/span> new<\/span> short<\/span>[<\/span>numSamples<\/span>];<\/span>\r\n        int<\/span> pointer<\/span> =<\/span> 0<\/span>;<\/span>\r\n        for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> numSamples<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n            short<\/span> amplitude<\/span> =<\/span> 0<\/span>;<\/span>\r\n            for<\/span> (<\/span>int<\/span> byteNumber<\/span> =<\/span> 0<\/span>;<\/span> byteNumber<\/span> <<\/span> bytePerSample<\/span>;<\/span> byteNumber<\/span>++)<\/span>\r\n                amplitude<\/span> |=<\/span> (<\/span>short<\/span>)<\/span> ((<\/span>sourceData<\/span>[<\/span>pointer<\/span>++]<\/span> &<\/span> 0xFF<\/span>)<\/span> <<<\/span> (<\/span>byteNumber<\/span> *<\/span> 8<\/span>));<\/span>\r\n            amplitudes<\/span>[<\/span>i<\/span>]<\/span> =<\/span> amplitude<\/span>;<\/span>\r\n        }<\/span>\r\n        \/\/ Linear interpolation<\/span>\r\n        short<\/span>[]<\/span> targetSample<\/span> =<\/span> interpolate<\/span>(<\/span>sourceRate<\/span>,<\/span> targetRate<\/span>,<\/span> amplitudes<\/span>);<\/span>\r\n        int<\/span> targetLength<\/span> =<\/span> targetSample<\/span>.<\/span>length<\/span>;<\/span>\r\n        byte<\/span>[]<\/span> bytes<\/span>;<\/span>\r\n        if<\/span> (<\/span>bytePerSample<\/span> ==<\/span> 1<\/span>)<\/span> {<\/span>\r\n            bytes<\/span> =<\/span> new<\/span> byte<\/span>[<\/span>targetLength<\/span>];<\/span>\r\n            for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> targetLength<\/span>;<\/span> i<\/span>++)<\/span>\r\n                bytes<\/span>[<\/span>i<\/span>]<\/span> =<\/span> (<\/span>byte<\/span>)<\/span> targetSample<\/span>[<\/span>i<\/span>];<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            bytes<\/span> =<\/span> new<\/span> byte<\/span>[<\/span>targetLength<\/span> *<\/span> 2<\/span>];<\/span>\r\n            for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> targetSample<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n                bytes<\/span>[<\/span>i<\/span> *<\/span> 2<\/span>]<\/span> =<\/span> (<\/span>byte<\/span>)<\/span> (<\/span>targetSample<\/span>[<\/span>i<\/span>]<\/span> &<\/span> 0xff<\/span>);<\/span>\r\n                bytes<\/span>[<\/span>i<\/span> *<\/span> 2<\/span> +<\/span> 1<\/span>]<\/span> =<\/span> (<\/span>byte<\/span>)<\/span> ((<\/span>targetSample<\/span>[<\/span>i<\/span>]<\/span> >><\/span> 8<\/span>)<\/span> &<\/span> 0xff<\/span>);<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n        return<\/span> bytes<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ \u7dda\u5f62\u88dc\u9593<\/span>\r\n    short<\/span>[]<\/span> interpolate<\/span>(<\/span>int<\/span> oldSampleRate<\/span>,<\/span> int<\/span> newSampleRate<\/span>,<\/span> short<\/span>[]<\/span> samples<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>oldSampleRate<\/span> ==<\/span> newSampleRate<\/span>)<\/span>\r\n            return<\/span> samples<\/span>;<\/span>\r\n        int<\/span> newLength<\/span> =<\/span> Math<\/span>.<\/span>round<\/span>(((<\/span>float<\/span>)<\/span> samples<\/span>.<\/span>length<\/span> \/<\/span> oldSampleRate<\/span> *<\/span> newSampleRate<\/span>));<\/span>\r\n        float<\/span> lengthMultiplier<\/span> =<\/span> (<\/span>float<\/span>)<\/span> newLength<\/span> \/<\/span> samples<\/span>.<\/span>length<\/span>;<\/span>\r\n        short<\/span>[]<\/span> interpolatedSamples<\/span> =<\/span> new<\/span> short<\/span>[<\/span>newLength<\/span>];<\/span>\r\n        for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> newLength<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n            float<\/span> currentPosition<\/span> =<\/span> i<\/span> \/<\/span> lengthMultiplier<\/span>;<\/span>\r\n            int<\/span> nearestLeftPosition<\/span> =<\/span> (<\/span>int<\/span>)<\/span> currentPosition<\/span>;<\/span>\r\n            int<\/span> nearestRightPosition<\/span> =<\/span> nearestLeftPosition<\/span> +<\/span> 1<\/span>;<\/span>\r\n            if<\/span> (<\/span>nearestRightPosition<\/span> >=<\/span> samples<\/span>.<\/span>length<\/span>)<\/span>\r\n                nearestRightPosition<\/span> =<\/span> samples<\/span>.<\/span>length<\/span> -<\/span> 1<\/span>;<\/span>\r\n            float<\/span> slope<\/span> =<\/span> samples<\/span>[<\/span>nearestRightPosition<\/span>]<\/span> -<\/span> samples<\/span>[<\/span>nearestLeftPosition<\/span>];<\/span>\r\n            float<\/span> positionFromLeft<\/span> =<\/span> currentPosition<\/span> -<\/span> nearestLeftPosition<\/span>;<\/span>\r\n            interpolatedSamples<\/span>[<\/span>i<\/span>]<\/span> =<\/span> (<\/span>short<\/span>)<\/span> (<\/span>slope<\/span> *<\/span> positionFromLeft<\/span> +<\/span> samples<\/span>[<\/span>nearestLeftPosition<\/span>]);<\/span>\r\n        }<\/span>\r\n        return<\/span> interpolatedSamples<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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